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A study of the b-quark fragmentation function with the DELPHI detector at LEP I and an averaged distribution obtained at the Z pole
|
Unfolding Methods in High-energy Physics Experiments
|
Porin channels in intact cells of Escherichia coli are not affected by Donnan potentials across the outer membrane.
|
eng_Latn
| 788,433 |
Effect of neck rotation on the timing and pattern of infant tidal breathing.
|
The effect of head rotation on efficiency of face mask ventilation in anaesthetised apnoeic adults: A randomised, crossover study
|
Porin channels in intact cells of Escherichia coli are not affected by Donnan potentials across the outer membrane.
|
eng_Latn
| 788,438 |
A study of two new generalized negative KdV type equations
|
Some tricks from the symmetry-toolbox for nonlinear equations: generalizations of the Camassa-Holm equation
|
Porin channels in intact cells of Escherichia coli are not affected by Donnan potentials across the outer membrane.
|
eng_Latn
| 788,464 |
Impact of Large Discharge Fluctuations on the Macroinvertebrate Populations Downstream of a Dam
|
Downstream effect of a pumped-storage hydropower plant on river habitat conditions and benthic life — a case study
|
Porin channels in intact cells of Escherichia coli are not affected by Donnan potentials across the outer membrane.
|
eng_Latn
| 788,484 |
Dynamic study of the time constant in High intensity discharge lam
|
Nonlinear high-intensity discharge lamp model including a dynamic electrode voltage drop
|
Porin channels in intact cells of Escherichia coli are not affected by Donnan potentials across the outer membrane.
|
eng_Latn
| 788,494 |
Clinico - epidemiological study of corrosive poisoning by different agents in Dhaka Medical College Hospital
|
Pattern of Pre-Hospital Treatment Received by Cases of Pesticide Poisoning
|
Porin channels in intact cells of Escherichia coli are not affected by Donnan potentials across the outer membrane.
|
eng_Latn
| 788,500 |
Infiltration as the First Site of Relapse of Prim ary T esticular T-cell Lym phom a
|
Malignant lymphoma of the testis, epididymis, and spermatic cord. A clinicopathologic study of 69 cases with immunophenotypic analysis.
|
Porin channels in intact cells of Escherichia coli are not affected by Donnan potentials across the outer membrane.
|
eng_Latn
| 788,544 |
Effect of a neuronal sodium channel blocker on magnetic resonance derived indices of brain water content during global cerebral ischemia
|
Normobaric hyperoximia increases hypoxia-induced cerebral injury: DTI study in rats.
|
Porin channels in intact cells of Escherichia coli are not affected by Donnan potentials across the outer membrane.
|
eng_Latn
| 788,553 |
Cell-penetrating peptides in protein mimicry and oligonucleotide delivery Applications and mechanisms
|
The plasma membrane functions as a barrier, restricting entry of hydrophilic pharmaceutical agents. Cell-penetrating peptides (CPPs) are capable of transporting bioactive cargos into the cell and h ...
|
Background/purpose ::: Dipeptidyl peptidase-4 (DPP-4) inhibitors are the most popular oral antidiabetic drugs (OADs) in recent 20 years because of the low risk of hypoglycemia, intermediate efficacy to lower glycated hemoglobin (△HbA1c): 0.5–0.9%, neutral effect on body weight change, convenience for usage (mostly once daily), and rare occurrence of major side effects. The purpose of this study was to determine the important predictors of the efficacy of naive use of DPP-4 inhibitors in Taiwanese patients with type 2 diabetes mellitus (T2D).
|
eng_Latn
| 788,608 |
A re-evaluation of fumagillin selectivity towards endothelial cells.
|
We have re-evaluated the selectivity of fumagillin against endothelial cell proliferation and compared it to the reported selectivity of its potent analog TNP-470. We showed that fumagillin does not inhibit endothelial cell proliferation in a specific manner, but on the contrary it inhibits the proliferation of other cell types at the same range of concentrations. Furthermore, the IC 50 values of fumagillin for endothelial cells are two orders of magnitude higher than those values reported for TNP-470 on endothelial cells; on the contrary, the IC 50 value of fumagillin for human breast cancer MDA-MB231 cells is four orders of magnitude lower than the value reported for TNP-470 on the same cell line.
|
This article is to introduce FDA's(Food and Drug Administration,FDA)considerations of non-inferiority design used in anti-bacterial drug clinical trial.Non-inferiority study designs may be appropriate when there is adequate evidence of a defined effect size for the control treatment,so that the proposed non-inferiority margin can be supported.
|
eng_Latn
| 788,609 |
Design and synthesis of a novel antitumor reagent XK469 derivatives
|
OBJECTIVE To design and synthesize a novel quinoxaline derivative as antitumor reagent.ME- THODS Using 2,7-dichloroquinoxaline and 2,4-pyridinediol as material,introducing a pyridine to the new quinox- aline derivatives.RESULTS The structures of the target molecules were characterized by elemental analysis,~1HNMR,MS,and IR.CONCLUSION A novel potential anfitumor reagent was synthesized and it can be a good representation of the knowing antitumor reagent XK469.
|
Background ::: Spontaneously metastatic xenograft models of cancer are infrequent and the few that exist are resource intensive. In xenografts, caliper measurements can be used to determine primary tumor burden and response to therapy but in metastatic disease models determination of the presence of metastatic disease, metastatic burden, and response to therapy are difficult, often requiring serial necropsy. In this study we characterized the development of visceral metastases in a patient derived xenograft model (PDXM) using in vivo imaging.
|
eng_Latn
| 788,788 |
In vivo neutralization of tetrodotoxin by a monoclonal antibody.
|
This study examined the ability of monoclonal antibody against TTX to neutralize tetrodotoxin (TTX) in vivo. The mice were injected i.p. with 1.5 mouse units of TTX, followed 3 min later by administering graded doses of antibody immunoglobulin G (IgG). Animals injected with 100 micrograms IgG through the tail vein showed 100% survival. The 50% protective dose was c. 2 mg/kg. The present results indicate that monoclonal antibody can neutralize TTX in vivo.
|
ELECTRONIC COMPONENTS MATERIALS (China), Vol 19, No 3, P 5 6 (Jun 2000) In Chinese In conventional formula, SrTiO 3 is prepared by solid phase reaction and MnO 2 is used as acceptor. To lower the varistor voltage, SrTiO 3 prepared by oxalate decomposition and acceptor of Li 2CO 3 are adopted instead of the formers respectively. The experiment results show that varistor voltage is effectively lowered, and dielectric properties improved also. (6 refs.)
|
eng_Latn
| 788,797 |
Infiltration of 3D printed tricalciumphosphate scaffolds with biodegradable polymers and biomolecules for local drug delivery
|
D printing is well suited and the most impor- tant technique to produce scaffolds with a reproducible complex internal structure directly from powder materials based on tricalciumphosphates (TCP) for the reconstruc- tion of bone defects. In this study, we could show success- ful infiltration of fabricated TCP scaffolds with biode- gradable polymers and a model biomolecule in order to provide the structure with a sustained drug release func- tion.
|
Abstract Phosphoinositide 3-kinase alpha (PI3Kα) has proved to be an attractive target for the development of therapeutics for the treatment of cancer. Herein we report a successful application of the structure-based virtual screening to identify the novel inhibitors of PI3Kα. These inhibitors have desirable physicochemical properties as a drug candidate and reveal a moderate potency with IC 50 values ranging from 20 to 40 μM. Therefore, they deserve a consideration for further development by structure–activity relationship (SAR) studies to optimize the inhibitory activities. Structural features relevant to the stabilization of the newly identified inhibitors in the ATP-binding site of PI3Kα are addressed in detail.
|
eng_Latn
| 788,812 |
TFE3-positive renal cell carcinoma occurring in three children with dysfunctional kidneys on immunosuppression
|
Pediatric RCC is a rare pediatric neoplasm and is distinctly different compared to adult RCC, often demonstrating translocation morphology evidenced by unique histopathological features and TFE3 or TFEB nuclear expression. We report three cases of pediatric TFE3 positive RCC (TFE3-RCC) occurring in the setting of chronic kidney disease and long-term pharmacological immunosuppression, including two cases that developed in the native kidney following kidney transplantation. Together, these cases suggest that the kidney microenvironment in combination with immune dysregulation is likely contributing factors in the pathogenesis of some pediatric RCC, warranting further study. Long-term post-transplant surveillance may warrant screening for RCC.
|
Abstract The addition products of Ti(IV)-enolate derived from β-keto α-diazo carbonyl compound to ketones or α,β-unsaturated compounds were subjected to Rh 2 (OAc) 4 -catalyzed and photo-induced diazo decomposition. The Rh 2 (OAc) 4 -catalyzed reaction afforded intramolecular O–H insertion products, while the photo-induced reaction gave Wolff rearrangement/intramolecular nucleophilic addition products. The transformations represent new approaches to tetrahydrofuran and γ-butyrolactone derivatives.
|
eng_Latn
| 788,817 |
Potent orally active inhibitors of angiotensin-converting enzyme (ACE).
|
1-[3-Mercaptoalkanoyl] pyroglutamic acids and 1-[3-mercaptoalkanoyl]-4-hetero (oxa, thia and aza) pyroglutamic acids were prepared and their inhibitory activities against angiotensin-converting enzyme (ACE) were examined. (2S)-1-[(2S)-3-Mercapto-2-methylpropanoyl] pyroglutamic acid 2 was found to be the most potent orally active inhibitor of ACE of rabbit lung among the derivatives synthesized in the present study and appeared to have great potential for use as an oral antihypertensive agent.
|
Abstract A laser–diode-pumped passively Q-switched new type crystal Nd 3+ :NaY(WO 4 ) 2 (known as Nd:NYW) laser with GaAs semiconductor saturable absorber has been realized. The dependence of pulse repetition rate, pulse energy, pulse width, and peak power on pump power for different output coupler reflectivities are measured. The coupled rate equations are used to simulate the Q-switched process of laser, and the numerical solutions agree with the experimental results.
|
eng_Latn
| 788,845 |
Crystallization and preliminary X-ray analysis of the Tet-repressor/operator complex.
|
Three crystal forms of the repressor protein TetR class D in complex with the palindromic 17 bp operator sequence containing T overhangs on both sides were obtained by hanging-drop vapor-diffusion methods using PEG 4000 and PEG monomethylether 5000 as precipitants. Although the crystallization conditions were very similar, up to three different crystal forms were observed in the same drop. The space groups are monoclinic C2, P21 and hexagonal P6122. The asymmetric units of the latter two crystal forms contain one repressor-operator complex. The crystal structures of these forms were solved by molecular replacement using the Tet-repressor molecule of the complex with tetracycline as a search model.
|
Background ::: A major complication associated with cardiac surgery is excessive and prolonged bleeding in the perioperative period. Improving coagulation by inhibiting fibrinolysis, primarily through inhibition of plasmin activity (PLact) with antifibrinolytics such as tranexamic acid (TXA) has been a pharmacological mainstay in cardiac surgical patients. Despite its almost ubiquitous use, the temporal and regional modulation of PLact profiles by TXA remain unexplored. Accordingly, the present study developed a fluorogenic-microdialysis system to measure in-vivo dynamic changes in PLact following TXA administration in a large animal model.
|
eng_Latn
| 788,853 |
Transferrin-modified nanostructured lipid carriers as multifunctional nanomedicine for codelivery of DNA and doxorubicin
|
Background ::: Nanostructured lipid carriers (NLC), composed of solid and liquid lipids, and surfactants are potentially good colloidal drug carriers. The aim of this study was to develop surface-modified NLC as multifunctional nanomedicine for codelivery of enhanced green fluorescence protein plasmid (pEGFP) and doxorubicin (DOX).
|
Respiratory infections remain a significant public health problem and are presently the 6th leading cause of death in the United States. Antibiotic-resistant organisms are encountered increasingly in both community-acquired and nosocomial infections. Despite progress in antibiotic development, biological-response modifiers may have increasing application to augment pulmonary host defenses against either drug-resistant infections or in high-risk hosts. Toward this end, gene therapy proposes to deliver biologicals as nucleic acids rather than protein. Gene therapy has the potential advantage of targeting the biological to specific cells or tissue compartments, and a more favorable pharmacokinetic profile. Data on gene delivery and efficacy in preclinical models of pulmonary infection are presented and discussed.
|
eng_Latn
| 788,860 |
Effect of ultra violet irradiation on low voltage cable insulation
|
To connect the low voltage (1.1 kV rating) underground XLPE and PVC insulated power cables with the overhead distribution network, short lengths of the core insulation are used with their ends often exposed to the atmosphere. Such exposed insulation is reported to develop cracks and become brittle within a few months of installation. Experimental investigation with accelerated UV irradiation in the laboratory revealed significant aging effect on the mechanical properties of XLPE core insulation material. The aging process was found to be faster when the insulation material was under mechanical stress.
|
A series of novel coumarin-chalcone hybrids have been synthesized in good yields and evaluated for their in vitro & in vivo anticancer activity. Cytotoxicity study was done against MCF-7 and Zr-75-1 human cancer cell lines. All compounds exhibited significant antiproliferative properties on both cell lines. The most active ER modulators found in in vitro screening are subjected for in vivo screened using methyl nitrosourea (MNU) induced mammary carcinoma in female spraque dawley rats. The Glide XP docking was performed for designed scaffold to optimize its structural requirement for ER-α inhibition.
|
eng_Latn
| 788,876 |
Phase 1 study of MLN8054, a selective inhibitor of Aurora A kinase in patients with advanced solid tumors
|
Purpose ::: Aurora A kinase is critical in assembly and function of the mitotic spindle. It is overexpressed in various tumor types and implicated in oncogenesis and tumor progression. This trial evaluated the dose-limiting toxicities (DLTs) and maximum tolerated dose (MTD) of MLN8054, a selective small-molecule inhibitor of Aurora A kinase.
|
The present invention relates to vectors useful for the administration of active principles (PA), preferably medicinal or nutritional, especially orally or parenterally. The technical problem solved by the invention is that consisting in the supply of vectors formed by (nano) or (micro) particles based on polyamino acids, and which are inert with respect to PA (proteins), of controllable granulometry, resistant and economical. The invention has an average particle size of less than 200 mum and consists of a polyamino acid of the Leu / Glu type, in which Leu / Glu + Leu> = 20% and Mw> = 10,000 D.
|
eng_Latn
| 788,882 |
Histone deacetylase and microtubules as targets for the synthesis of releasable conjugate compounds.
|
Design and synthesis of an HDAC inhibitor and its merger with three tubulin binders to create releasable conjugate compounds is described. The biological evaluation includes: (a) in vitro reactivity with glutathione, (b) antiproliferative activity, (c) cell cycle analysis and (d) quantification of protein acetylation. The cellular pharmacology study indicated that the HDAC-inhibitor-drug conjugates retained antimitotic and proapoptotic activity with a reduced potency.
|
Methionyl tRNA acylated within mitochondria isolated from mouse liver, has been resolved into four species by RPC-5 chromatography. All four elute prior to the three cytoplasmic methionyl tRNA species. Of the four species, two are formylated. These results suggest that iso-accepting species of met-tRNAmet exist in mouse liver mitochondria.
|
eng_Latn
| 788,886 |
Indirect chemical conjugates hyaluronate obtained by forming or antitumor bio complex of its derivative, and their use in the pharmaceutical field
|
The present invention, hyaluronic acid and / or novel bioconjugates group which can be obtained by indirect synthesis means by molecular spacer between the agent having anti-tumor activity belonging to the derivatives with various groups, methods for their preparation , and it discloses the use in oncology. The novel derivatives have a variety of physicochemical properties for binding type and degree of substitution, by the characteristic, is their resistance and effectiveness improved, more accurate dosage adjustment, active target induction mechanisms It becomes available is. .BACKGROUND
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In this study muon-spin rotation (μSR) serves as a tool for sensitive monitoring of the environment of muoniated radicals in isotropic liquids. A systematic investigation of the behaviour of the hyperfine coupling constants of cyclohexadienyl-type radicals is performed, and it is found that they are in linear dependence on solvent polarity, with certain deviations. These deviations are discussed in detail. It is found that with increasing length of the hydroxyalkyl substituent group the perturbation of the phenyl ring becomes smaller.
|
eng_Latn
| 788,892 |
Post-mortem radiological examination in infants: evidence of child abuse?
|
We examined the value of post-mortem radiological examination of infants who were brought in for medico-legal autopsy. Twenty children between the age of 1 month and 15 months died under the picture of SIDS. No radiological or other signs of previous child abuse were seen in our autopsy material. A fatal case of child abuse with several metaphyseal fractures is reported. Some fractures were not visible on gross examination, but could be demonstrated by radiography and histology. In our material no association between SIDS and child abuse was found. In suspected cases of child abuse, particularly rib fractures and metaphyseal fractures should be sought. We recommend that post-mortem radiography is performed in such cases. If fractures are demonstrated, they should be verified by histologic examination.
|
A series of novel coumarin-chalcone hybrids have been synthesized in good yields and evaluated for their in vitro & in vivo anticancer activity. Cytotoxicity study was done against MCF-7 and Zr-75-1 human cancer cell lines. All compounds exhibited significant antiproliferative properties on both cell lines. The most active ER modulators found in in vitro screening are subjected for in vivo screened using methyl nitrosourea (MNU) induced mammary carcinoma in female spraque dawley rats. The Glide XP docking was performed for designed scaffold to optimize its structural requirement for ER-α inhibition.
|
eng_Latn
| 788,897 |
The role of ceria-based nanostructured materials in energy applications
|
Ceria (CeO2) is enjoying increasing popularity in catalytic applications, and in some cases has established itself as an irreplaceable component. The reasons for such success stem from the intrinsic structural and redox properties of ceria. Reducing the ceria particles to the nanoscale has a profound impact on the catalytic behavior. The proliferation of improved synthetic methods that allow control over the final morphology and size of the nano-structures is opening new possibilities in terms of catalytic potential, particularly for energy-related applications.
|
A series of novel coumarin-chalcone hybrids have been synthesized in good yields and evaluated for their in vitro & in vivo anticancer activity. Cytotoxicity study was done against MCF-7 and Zr-75-1 human cancer cell lines. All compounds exhibited significant antiproliferative properties on both cell lines. The most active ER modulators found in in vitro screening are subjected for in vivo screened using methyl nitrosourea (MNU) induced mammary carcinoma in female spraque dawley rats. The Glide XP docking was performed for designed scaffold to optimize its structural requirement for ER-α inhibition.
|
eng_Latn
| 788,905 |
Epidemiological aspects and financial impact of lumpy skin disease in Ethiopia.
|
Epizootiological study on spatiotemporal clusters of Schmallenberg virus and Lumpy skin diseases: The case of Russia
|
Exogenous growth factors do not affect the development of individually cultured murine embryos
|
eng_Latn
| 788,922 |
how long does hbv live on surfaces
|
The study found that the hepatitis C virus can live for up to 63 days in a high volume tuberculin syringe with a detachable needle compared to 7 days in a low volume syringe (insulin syringe with permanent needles).
|
How long do microbes like bacteria and viruses live on surfaces in the home at normal room temperatures? Art Dekenipp Alvin, Texas. The answer is probably not what you want to hear: Microbes can live on household surfaces for hundreds of years. The good news, however, is that most don't. Some well-known viruses, like HIV, live only a few seconds. Microbes, of course, are everywhere. Each square centimeter of skin alone harbors about 100,000 bacteria. And a single sneeze can spray droplets infested with bacteria and viruses as far as 3 feet.
|
eng_Latn
| 789,174 |
what are three ways that parasitic worms cause disease
|
Terminology [edit]. Although organisms such as bacteria function as parasites, the usage of the term parasitic disease is usually more restricted. The three main types of organisms causing these conditions are protozoa (causing protozoan infection), helminths (helminthiasis), and ectoparasites.ome parasites like Toxoplasma gondii and Plasmodium spp. can cause disease directly, but other organisms can cause disease by the toxins that they produce.
|
Although organisms such as bacteria function as parasites, the usage of the term parasitic disease is usually more restricted.The three main types of organisms causing these conditions are protozoa (causing protozoan infection), helminths (helminthiasis), and ectoparasites.arasitic diseases can affect practically all living organisms, including plants and mammals. The study of parasitic diseases is called parasitology. The share of parasitic diseases account for about 14 000 000 deaths per year, representing 25% of global mortality-one in four deaths according to the WHO.
|
eng_Latn
| 789,236 |
what is plant pathology
|
What is Plant Pathology? Plant pathology is the study of plants and their pathogens, the process of disease, and how plant health and disease are influenced by factors such as the weather, nonpathogenic microorganisms, and plant nutrition. It encompasses fundamental biology as well as applied agricultural sciences.
|
Plant pathology also involves the study of pathogen identification, disease etiology, disease cycles, economic impact, plant disease epidemiology, plant disease resistance, how plant diseases affect humans and animals, pathosystem genetics, and management of plant diseases.he oomycetes are not true fungi but are fungus-like organisms. They include some of the most destructive plant pathogens including the genus Phytophthora, which includes the causal agents of potato late blight and sudden oak death. Particular species of oomycetes are responsible for root rot.
|
eng_Latn
| 789,261 |
Adrenal incidentalomas are tied to increased risk of diabetes: findings from a prospective study
|
Is Follow-up of Adrenal Incidentalomas Always Mandatory?
|
Adrenal incidentalomas: incidental in detection, not significance.
|
eng_Latn
| 789,324 |
Mucormycosis in children: a study of 22 cases in a Mexican hospital
|
Diabetes mellitus as the major risk factor for mucormycosis in Mexico: Epidemiology, diagnosis, and outcomes of reported cases
|
Chromoblastomycosis: a review of 100 cases in the state of Rio Grande do Sul, Brazil.
|
eng_Latn
| 789,327 |
DIABETES MELLITUS AT THE MASSACHUSETTS GENERAL HOSPITAL FROM 1824 TO 1898. A STUDY OF THE MEDICAL RECORDS.
|
The examination of the records of the cases of saccharine diabetes treated in the wards of the Massachussetts General Hospital during the past seventy-four years was begun for the purpose of seeking evidence with regard to the pancreatic origin of this disease. (See Yale Medical Journal , 1898, iv, 275.) Since several hundred volumes were to be searched it seemed desirable to obtain at the same time information upon other points which might contribute to the statistics of diabetes. Facts of interest in diagnosis and treatment were elicited as the study progressed and this paper is offered rather as a historical sketch of the progress of a disease drawn from the original records than as an attempt to advance in any way our knowledge of the subject. Since diabetes mellitus was first sharply differentiated from diabetes insipidus early in the present century, the hospital records may be considered to be nearly
|
Abstract Context.—The metastasis-associated gene 1 (MTA1) is overexpressed in several human cancers. Recent reports suggest that MTA1 may play a role in cancer progression either through transcript...
|
yue_Hant
| 789,360 |
Prevalence and Impact of Unknown Diabetes in the ICU.
|
Objectives:Many patients with diabetes and their care providers are unaware of the presence of the disease. Dysglycemia encompassing hyperglycemia, hypoglycemia, and glucose variability is common in the ICU in patients with and without diabetes. The purpose of this study was to determine the impact
|
201Background: Unplanned acute care is debilitating and burdensome for patients with advanced cancer and their caregivers. There is a pressing need to understand how available evidence-based practi...
|
eng_Latn
| 789,365 |
[Status of pancreatic organ and pancreatic islet cell transplantation].
|
The results of allogeneic clinical islet cell transplantation continue to be rather disappointing. However, results of clinical pancreatic transplantation in Type-I-diabetes are still improving: some centres (incl. the Munich centre) have reported a 1-year-graft survival rate of more than 70%. In 60-65% of successfully transplanted patients a normalisation of glucose tolerance can be achieved. There is accumulating evidence suggesting that successful pancreatic transplantation exerts a curative effect in Type I diabetes mellitus: Long term investigations have shown a subjective and objective improvement of diabetic retinopathy, nephropathy, polyneuropathy and peripheral microangiopathy.
|
819Background: Preoperative chemoradiotherapy regimen using S-1 plus Irinotecan is still under clinical investigation. The aim of this study was to investigate the significance and the long-term ou...
|
eng_Latn
| 789,368 |
White U.S. children have highest rates of diabetes
|
Non-Hispanic white children have the highest rates of diabetes in the United States, U.S. researchers said on Tuesday, and the disease appears to be more common than expected.
|
Certain kinds of carbohydrates may play a role in the development of age-related macular degeneration, a new study suggests.
|
eng_Latn
| 789,386 |
Exercise cuts heart risks for type 1 diabetes kids
|
NEW YORK - Children and teens with type 1 diabetes may be able to reduce their risk of future heart and blood vessel disease by taking part in regular exercise, German researchers report.
|
Certain kinds of carbohydrates may play a role in the development of age-related macular degeneration, a new study suggests.
|
eng_Latn
| 789,388 |
Americans making progress managing diabetes: study
|
Americans appear to be doing a better job of managing diabetes, with more than half of diabetics reaching recommended targets for controlling blood sugar last year, according to a survey published on Saturday.
|
The obesity epidemic has a simple solution. If you want to lose weight, either eat less, or breathe more.
|
eng_Latn
| 789,389 |
Statins Cut Diabetics' Risk of Heart Attacks, Study Finds
|
People suffering from the most common form of diabetes could sharply cut their risk for heart attacks and strokes by taking a cholesterol-lowering drug even if they have normal cholesterol levels, according to a major new study.
|
Gail Rutter of Frederick had a problem. Diagnosed earlier this year with diabetes, she and her two grown children thought that their traditional Christmas dinner would be off limits because of its high fat content and added sugar.
|
kor_Hang
| 789,394 |
what is impotence risk
|
Impotence Linked to Risk of Type 2 Diabetes. MONDAY, July 20, 2015 (HealthDay News) -- Men who experience impotence may face twice the risk of undiagnosed type 2 diabetes compared to men without such sexual problems, a new study suggests.
|
We're sorry, an error occurred. Impotence, also known as erectile dysfunction, is the inability to get or keep an erection. It can happen to men at any age and is never considered a normal finding. The risk for impotence can increase with age, but age does not cause impotence. Rather,... Read more.
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eng_Latn
| 789,523 |
what causes brain shrinkage high blood sugar
|
Sept. 4, 2012 -- Blood sugar levels at the high end of what is considered normal may put the brain at risk, according to a new Australian study. Researchers in Canberra report a link between the shrinkage of two brain regions, the hippocampus and the amygdala, and normal blood sugar levels.
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Stroke: When there is no blood flow to a major part of the brain stem or loss of blood accompanied with swelling, coma can occur. Blood sugar: In people with diabetes, coma can occur when blood sugar levels stay very high.
|
eng_Latn
| 789,595 |
what parts of your body does sugar affect
|
Here are some of the effects that consuming too much sugar has on your health: 1 It overloads and damages your liver. 2 It tricks your body into gaining weight and affects your insulin and leptin signaling. 3 It causes metabolic dysfunction. 4 It increases your uric acid levels.
|
A 2012 UCLA study on the effects of sugar demonstrated how sugar affects the brain's memory and learning ability, however a diet high in omega-3 fatty acids will protect the brain from such effects. Physical activity will also keep the brain young, as it increases blood flow to the brain.
|
eng_Latn
| 789,655 |
what age diabetes occur
|
There are two main types of diabetes. Type 1 diabetes usually occurs during childhood or adolescence. Type 2 diabetes, which is the most common form of the disease, usually occurs in people who are 45 years of age or older.However, the rate of diagnosis of type 2 diabetes in children and adolescents is increasing.here are two main types of diabetes. Type 1 diabetes usually occurs during childhood or adolescence. Type 2 diabetes, which is the most common form of the disease, usually occurs in people who are 45 years of age or older.
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According to the American Diabetes Association, about 3,600 people under the age of 20 are diagnosed with type 2 diabetes every year. A 2012 study published in Diabetes Care considered the potential future number of diabetes cases in people under the age of 20. The study found that, at current rates, the amount of people under the age of 20 with type 2 diabetes could increase by up to 49 percent by 2050.
|
eng_Latn
| 789,693 |
medications to treat type 2 diabetes
|
A study comparing the efficacy and safety of monotherapy with sitagliptin or metformin in treatment-naive patients with type 2 diabetes found no statistical differences between the 2 drugs in terms of decreases in HbA1c and fasting glucose levels.
|
Type 2 diabetes (T2D) is treated: 1 First with weight reduction, a diabetic diet, and exercise. 2 Oral medications are prescribed when these measures fail to control the elevated blood sugars of type 2 diabetes. 3 If oral medications become ineffective treatment with insulin is initiated.
|
eng_Latn
| 789,695 |
what reduces insulin
|
Alternatively there is a recent study showing how to reduce insulin levels naturally and how to lower insulin levels with exercise. The study shows that exercise can have an immediate effect on insulin levels and can even reduce insulin levels in as little as 15 minutes a day.
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1 A sulfonylurea, such as glipizide, helps the pancreas make more insulin. It also helps the cells respond to insulin better. This helps to lower blood sugar and keep it under better control. Metformin works in several ways. It decreases the amount of sugar (glucose) made by the liver.
|
eng_Latn
| 789,722 |
can diabiets 2 be cured by diet change
|
People with Type 2 diabetes can reverse their condition with diet and exercise, although remission is not very common, according to a new study from the Centers for Disease Control and Prevention.
|
In 2007, the American Heart Association found that those who drank either regular or diet soda had a higher risk of âmetabolic syndrome,â which includes diabetes, high blood pressure, high levels of LDL (âbadâ) cholesterol, and obesity, compared to nondrinkers.
|
eng_Latn
| 789,736 |
does stevia affect insulin resistance
|
As mentioned above, stevia sweetener is attractive as a sugar substitute that does not cause an adverse affect on blood glucose levels. Bring on the chocolate cake (made with stevia of course). However, some studies suggest that the benefits of stevia are much greater. Even more encouraging for the stevia and diabetes link, stevia has also been shown to increase insulin sensitivity. Meaning, it may reduce insulin resistance, helping the cells use insulin. Additionally, it has been shown to help stimulate insulin production. These two benefits are great news for diabetics.
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One research studying the effects of stevia, aspartame, and sucrose on food intake, satiety, and postprandial glucose and insulin levels found similar results and showed that compared to sucrose or aspartame consumers, human stevia consumers had lower post-meal blood sugar levels and much lower post-meal insulin levels.
|
eng_Latn
| 789,737 |
does ginger tea lower blood sugar
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Furthermore, a 2009 study in the European Journal of Pharmacology found that ginger extracts reduce blood levels of insulin by approximately 10 percent, and levels of blood sugar by approximately 35 percent. This effect was caused by ginger's interaction with insulin-inhibiting serotonin receptors.in It. (NaturalNews) Ginger may help increase insulin sensitivity in patients with type 2 diabetes, according to the findings of a recent study conducted by researchers from the Tabriz University of Medical Sciences in Iran and published in the International Journal of Food Sciences and Nutrition.
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Now, it looks like the spice can lower blood sugar in people with type 2 diabetes, according to a new study by researchers from Shahid Sadoughi University of Medical Sciences in Yazd, Iran. The research team studied 88 people with type 2 diabetes.inger can increase the effects of blood thinners, so if you're taking these drugs, don't take ginger, advises Howard. Make sure to tell your doctor that you're adding ginger to your regimen, and monitor your blood sugar levels regularly.
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eng_Latn
| 789,743 |
what causes diabetics to lose sleep
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Lack of sleep can actually increase your appetite, and your brain may not get the message that youâve had enough to eat. Read more. Lack of sleep affects the amount of insulin released after you eat, increasing your risk of developing type 2 diabetes. Read more. If you have hypertension, a single night without adequate sleep can elevate your blood pressure for a whole day. Read more.
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http://hubpages.com/hub/what-causes-over-sleeping. Problems Linked to Oversleeping. Diabetes. In a study of almost 9,000 Americans, researchers found a relationship between sleep and the risk of diabetes. People who slept more than nine hours each night had a 50% greater risk of diabetes than people who slept seven hours per night.
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eng_Latn
| 789,747 |
The aim of this paper is to study complex modified projective synchronization (CMPS) between fractional-order chaotic nonlinear systems with incommensurate orders. Based on the stability theory of incommensurate fractional-order systems and active control method, control laws are derived to achieve CMPS in three situations including fractional-order complex Lorenz system driving fractional-order complex Chen system, fractional-order real Rossler system driving fractional-order complex Chen system, and fractional-order complex Lorenz system driving fractional-order real Lu system. Numerical simulations confirm the validity and feasibility of the analytical method.
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This paper investigates the problem of synchronization of fractional-order complex-variable chaotic systems (FOCCS) with unknown complex parameters. Based on the complex-variable inequality and stability theory for fractional-order complex-valued system, a new scheme is presented for adaptive synchronization of FOCCS with unknown complex parameters. The proposed scheme not only provides a new method to analyze fractional-order complex-valued system but also significantly reduces the complexity of computation and analysis. Theoretical proof and simulation results substantiate the effectiveness of the presented synchronization scheme.
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Berzelius failed to make use of Faraday's electrochemical laws in his laborious determination of equivalent weights.
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eng_Latn
| 789,766 |
A Frequency-based Stochastic Blockmodel
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Infinite Hidden Relational Models
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On the equivalence between state space and frequency response models: A missing link for the study of the robustness problem
|
eng_Latn
| 789,790 |
This paper deals with the problem of sliding mode control design for nonlinear stochastic singular semi-Markov jump systems (S-MJSs). Stochastic disturbance is first considered in studying S-MJSs with a stochastic semi-Markov process related to Weibull distribution. The specific information including the bound of nonlinearity is known for the control design. Our attention is to design sliding mode control law to attenuate the influences of uncertainty and nonlinear term. First, by the use of the Lyapunov function, a set of sufficient conditions are developed such that the closed-loop sliding mode dynamics are stochastically admissible. Then, the sliding mode control law is proposed to ensure the reachability in a finite-time region. Finally, the practical system about dc motor model is given to verify the validity of the proposed method.
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Author's version of an article published in the journal: Journal of the Franklin Institute. Also available from the publisher at: http://dx.doi.org/10.1016/j.jfranklin.2011.09.015
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We prove that groups acting geometrically on delta-quasiconvex spaces contain no essential Baumslag-Solitar quotients as subgroups. This implies that they are translation discrete, meaning that the translation numbers of their nontorsion elements are bounded away from zero.
|
eng_Latn
| 789,817 |
Sensitivity reduction in single-input single-output systems
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On the equivalence between state space and frequency response models: A missing link for the study of the robustness problem
|
Extending the Global Sensitivity Analysis of the SimSphere model in the Context of its Future Exploitation by the Scientific Community
|
eng_Latn
| 789,846 |
Reactive mode handling of flexible manufacturing systems
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A FRAMEWORK BASED ON A HIGH CONCEPTION LEVEL TO GENERATE CONFIGURATIONS IN PRODUCTION SYSTEMS
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On the equivalence between state space and frequency response models: A missing link for the study of the robustness problem
|
eng_Latn
| 789,851 |
In order to obtain a robust optimal control for a DC drive system a different solution from the existing technical literature is proposed in this paper. By using the linear quadratic control the optimal speed of the DC dive is obtained. This serves as a reference to the adaptive DC drive system. The model reference adaptive control (MRAC) ensures the robustness to parameters and load variations, to unmodelled uncertainties and high dynamic performances. Moreover, the MRAC provides on-line the controller parameters. The problem statement of the optimal control, model reference adaptive control mechanism and the validation of the new proposed control by numerical simulations are presented in this paper. The transient regimes (starting, reversing or braking) are dominant in electric drive systems, therefore the energetic optimization of the DC motor is proposed.
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This paper describes the model reference adaptive fuzzy controller design and its application on automatic gauge control system. The controller produces the error of the closed loop control system response and the actual system output for the desired system by reference model, instead of ordinary adaptive mechanism. The analysis of dynamic performance for traditional PID controller and fuzzy adaptive controller is performed in detail with simulation software. Simulation results show that the system is with strong adaptive ability and can adapt to the wide range of changes of the controlled object. This study provides the primary theoretical guide for the design, optimization and control research of the automatic gauge control system.
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It is proved, by using topological properties, that when a group automorphism of a locally compact totally disconnected group is ergodic under the Haar measure, the group is compact. The result is an answer for Halmos's question that has remained open for the totally disconnected case.
|
eng_Latn
| 789,861 |
Dynamic-inversion is an effective alternative control structure when compared to a conventional proportional-derivative structure for the nonlinear dynamics of a flight motion simulator. Results indicate the dynamic-inversion controller significantly reduced the lag and motion errors in system response while accommodating a larger bandwidth of motion. Perturbations affected the dynamic-inversion performance, however, dynamic-inversion is recommended over the conventional proportional-derivative controller.
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Aiming at dealing with the existing noise of triaxial flight simulation turntable, the paper design digital filter low-pass transmitters and generalized minimum variance control filter to process signal for random disturbance, and have test study based on outside box control system of triaxial flight simulation turntable. The test results show that we can get better control effect by adopting generalized minimum variance control rates to denoise for measured signal on triaxial flight simulation turntable, and that is much helpful to improve the noise control accuracy.
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L 1 adaptive control has emerged as a powerful technique for enabling a posteriori control action given a bounded level of uncertainty and disturbance, while adhering to the appropriate bandwidth of the vehicle actuation system. In this paper, we present our recent approach to leverage the benefits of L 1 with a minimally invasive approach to an existing flight control system with an input output feedback linearization method, otherwise known as dynamic inversion. We detail the design steps and the augmented equations for integrating the adaptation via two candidate methodologies, and present simulation results on a multi-input multi-output linear time invariant model of a tailless fighter. Finally, we outline observations and comparisons and conclude with planned research ahead.
|
eng_Latn
| 789,897 |
This paper will study stochastic losslessness theory for nonlinear stochastic discrete-time systems, which are expressed by the Ito-type difference equations. A necessary and sufficient condition is developed for a nonlinear stochastic discrete-time system to be lossless. By the stochastic lossless theory, we show that a nonlinear stochastic discrete-time system can be lossless via state feedback if and only if it has relative degree and lossless zero dynamics. The effectiveness of the proposed results is illustrated by a numerical example.
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Under the weaker conditions on the power order and the nonlinear functions, this paper investigates the output-feedback stabilization problem for a class of stochastic high-order nonlinear systems. Based on the backstepping design method and homogeneous domination technique, the closed-loop system can be proved to be globally asymptotically stable in probability.
|
: The principal goal of this three years research effort was to enhance the research base which would support efforts to systematically control, or take advantage of, dominant nonlinear or distributed parameter effects in the evolution of complex dynamical systems. Such an enhancement is intended to support the development of flight controllers for increasing the high angle of attack or high agility capabilities of existing and future generations of aircraft and missiles. The principal investigating team has succeeded in the development of a systematic methodology for designing feedback control laws solving the problems of asymptotic tracking and disturbance rejection for nonlinear systems with unknown, or uncertain, real parameters. Another successful research project was the development of a systematic feedback design theory for solving the problems of asymptotic tracking and disturbance rejection for linear distributed parameter systems. The technical details which needed to be overcome are discussed more fully in this final report.
|
eng_Latn
| 789,900 |
In this study, a novel data-driven terminal iterative learning control with high-order learning law is proposed for a class of non-linear non-affine discrete-time multiple-input-multiple output systems, where only the system state or output at the endpoint is measurable and the control input is time-varying. A new data-driven dynamical linearisation is proposed in the iteration domain and the linearisation data model can be updated by a designed parameter updating law iteratively. The high-order learning control law makes it possible to utilise more control knowledge of previous runs to improve control performance. The design and analysis of the proposed approach only depends on the I/O data of the control plant without requiring any explicit model information. Both theoretical analysis and extensive simulations are provided to confirm the effectiveness and applicability of this novel approach.
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This study proposes data-driven model-free adaptive control (MFAC), model-free control (MFC) and virtual reference feedback tuning (VRFT) techniques applied to the control of a representative non-linear multi-input-multi-output (MIMO) system represented by the twin rotor aerodynamic system (TRAS). These data-driven techniques are implemented for both a single MIMO controller and two separately designed single-input-single-output controllers running in parallel for azimuth and pitch control. The three techniques are implemented as MFAC and MFC algorithms and as linear controllers tuned by VRFT. The performance of the three data-driven MIMO control system structures is compared systematically on the basis of the experimental results in terms of the values of the sum of mean squared control errors measured on TRAS equipment.
|
Berzelius failed to make use of Faraday's electrochemical laws in his laborious determination of equivalent weights.
|
eng_Latn
| 789,914 |
Instead of the problematic reasoning presented in the work of D. J. Braun [Phys. Rev. E 78, 016213 (2008)], a rigorous argument is provided to show the validity of the adaptive controller proposed by Braun under some particular assumptions. Without these assumptions, this controller may be failed to stabilize the unsteady state, which is numerically shown by specific examples. Also, the choice of parameters to guarantee the validity of these assumptions is illustrated.
|
A complete study of dynamical systems theory which focuses on the dynamics of both iteration of functions and solutions of ordinary differential equations. Symbolic dynamics, structural dynamics and chaos are the main ideas expressed in the book through examples of function and differential equations. Many low-level examples are also included to help the reader learn the meaning of the theorems and master the techniques of the proofs and topics under consideration. The text is intended for students and professionals in mathematics, physics and mechanical engineering.
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This paper presents two novel generic adaptive batching schemes for replicated servers. Both schemes are oblivious to the underlying communication protocols. Our novel schemes adapt their batching levels automatically and immediately according to the current communication load. This is done without any explicit monitoring or calibration of the system. Additionally, the paper includes a detailed performance evaluation.
|
eng_Latn
| 789,917 |
We study computabilty of the abstract linear Cauchy problem ::: ::: du(t)/dt=Au(t), t>0, u(0)=x∈X ::: ::: where A is a linear operator on a Banach space X. We give necessary and sufficient conditions for A such that the operator K:x↦ u is computable. We consider continuous operators and more generally closed operators A. For studying computability we use the representation approach to Computable Analysis (TTE) [7, 1] which is consistent with the model used in [6].
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We investigate systems of ordinary differential equations with a parameter. We show that under suitable assumptions on the systems the solutions are computable in the sense of recursive analysis. As an application we give a complete characterization of the recursively enumerable sets using Fourier coefficients of recursive analytic functions that are generated by differential equations and elementary operations. (C) 2010 Elsevier B.V. All rights reserved.
|
Berzelius failed to make use of Faraday's electrochemical laws in his laborious determination of equivalent weights.
|
eng_Latn
| 789,921 |
In this paper cyber role in social-ecological energy systems SEES is formalized by using the language of large-scale dynamical systems. The key notion of interaction variables is introduced in support of their modeling as multilayered dynamical systems. It is stressed that qualitatively different cyber designs are required for enabling performance of qualitatively different SEES architectures. In particular, it is proposed that composite control-based hierarchical control lends itself more naturally to supporting large-scale regulated monopolies, and that distributed multi-layered control with or without coordination is key to supporting SEES architectures comprising many decision makers. Today's hierarchical control is described as a particular case of hierarchical composite control. Having these formulations may help bridge R&D efforts across vastly multi-disciplinary communities working in the field of changing electric energy systems.
|
Topics considered include characteristics of power generation units, transmission losses, generation with limited energy supply, control of generation, and power system security. This book is a graduate-level text in electric power engineering as regards to planning, operating, and controlling large scale power generation and transmission systems. Material used was generated in the post-1966 period. Many (if not most) of the chapter problems require a digital computer. A background in steady-state power circuit analysis is required.
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In this paper we study the controllability of the Keller-Segel system approximating its parabolic-elliptic version. We show that this parabolic system is locally uniform controllable around a constant solution of the parabolic-elliptic system when the control is acting on the component of the chemical.
|
eng_Latn
| 789,944 |
A new social epidemic model to depict alcoholism with media coverage is proposed in this paper. Some fundamental properties of the model including existence and positivity as well as boundedness of equilibria are investigated. Stability of all equilibria are studied. The existence of the optimal control pair and mathematical expressions of optimal control are obtained by Pontryagin's maximum principle. Numerical simulations are also performed to illustrate our results. Our results show that media coverage is an effective measure to quit drinking.
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In this paper, we present a continuous mathematical model of alcohol drinking with the influence of private and public addiction treatment centers. We study the dynamical behavior of this model and we discuss the basic properties of the system and determine its basic reproduction number . We also study the sensitivity analysis of model parameters to know the parameters that have a high impact on the reproduction number . The stability analysis of the model shows that the system is locally as well as globally asymptotically stable at drinking-free equilibrium when . When , drinking present equilibrium exists and the system is locally as well as globally asymptotically stable at alcohol present equilibrium .
|
Berzelius failed to make use of Faraday's electrochemical laws in his laborious determination of equivalent weights.
|
eng_Latn
| 789,948 |
A baseline correction model for humidity and temperature compensationWO3 film based sensor for NO2 detection
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In this work, a generalized self-adaptive algorithm implementation to remove the humidity dependent gas sensor response of metal-oxide based sensors has been investigated. The sensor output analysis has been divided into steps of baseline stabilization, maximum deviation search, leak detection and recovery. The baseline search using consecutive slope comparison is accurate with an error of 0.225 to 26.88 %. Using an adaptive baseline model, the saturation value for 3 ppm NO 2 is accurately detected with a maximum error of 2.7 % and response magnitudes were found to have negligible variation. Using Ordinary Least Squares and QR Factorization, the baseline in the presence of gas was predicted using historical data of temperature and humidity relationship with current to find the point of recovery of baseline, hence considerably reducing the humidity & temperature effect which can be applied to all metal oxide-based gas sensors.
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This paper deals with robust estimation of states and unknown inputs for a class of non linear system described by Takagi-Sugeno fuzzy models. The proposed approach is developed on the basis of adaptive Luenberger observer theory. A robustness study, using the L 2 technique, is carried out to take in consideration the model uncertainties. Unknown inputs estimation is ensured through a fuzzy proportional integral adaptive law, computed from an accurate observer outputs which allow a fast dynamic estimation. Design conditions are formulated into Linear Matrix Inequalities (LMIs) terms. Numerical example is given to illustrate the efficiency of the proposed techniques.
|
eng_Latn
| 789,990 |
Development of MATLAB tools and case study for multirate control design
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This paper reports on the development of MATLAB tools for analysis and design of multirate control systems. The routines developed are applied to a case study of designing power system stabilizers.
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The authors discuss some software anti-interference methods of PC incontrollable.The methods help singlechip system to overcome every possible interferences and its own stoppage so that the singlechip system can be ensured to work efficiently.
|
eng_Latn
| 789,993 |
Hydrodynamics of stationary non-equilibrium states for some stochastic lattice gas models
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We consider discrete lattice gas models in a finite interval with stochastic jump dynamics in the interior, which conserve the particle number, and with stochastic dynamics at the boundaries chosen to model infinite particle reservoirs at fixed chemical potentials. The unique stationary measures of these processes support a steady particle current from the reservoir of higher chemical potential into the lower and are non-reversible. We study the structure of the stationary measure in the hydrodynamic limit, as the microscopic lattice size goes to infinity. In particular, we prove as a law of large numbers that the empirical density field converges to a deterministic limit which is the solution of the stationary transport equation and the empirical current converges to the deterministic limit given by Fick's law.
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This paper deals with the stabilization problem of the free-floating space manipulator system. Using the underactuated property and the conservation of angular momentum, a stabilization controller based on passivity concept is designed for this system. Associated proof shows that global stability of the angles of the manipulator joints is guaranteed. Moreover, for any kind of underactuated mechanism system, if the conservations of angular momentum property are satisfied, this kind of control strategy can be implemented to stabilize the actuated degree of freedom, which shows practical merit of the approach. Finally, numerical simulation of a simplified free-floating space robot system is conducted to prove the feasibility and effectiveness of the proposed control strategy.
|
eng_Latn
| 789,994 |
Random laser thresholds in cw and pulsed regimes
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We analyze the system of rate equations that, according to our previous studies, adequately describes the behavior of neodymium random lasers. We show that random lasers, in which a noticeable fraction of spontaneous emission goes to lasing modes, have different threshold behavior than regular lasers. We also demonstrate that although the dynamics of stimulated emission in random lasers is strongly dissimilar in different pumping regimes, the threshold energy remains constant, equal to the product of the cw threshold power and the spontaneous emission lifetime $\ensuremath{\tau}$, if the pumping pulse is much shorter than $\ensuremath{\tau}$. The results of the study suggest that one can compare the performance of random lasers in different operation regimes and use a cw approximation (with some restrictions) in an analysis of thresholds of pulsed random lasers.
|
The strip thickness control system is difficult to establish an accurate mathematical model, and traditional PID control strategy has a poor adaptive ability, so the effect of control is always not satisfying. According to the problems above, a new control strategy of self-tuning PID controller based on RBF neural network whose parameters are optimized by PSO algorithm is proposed in the paper. The control method integrates advantages of RBF neural network as well as PID controller and good global search capability of PSO algorithm. The simulation results indicate that the method not only improves control performance and dynamic quality, but also has strong self-adapting ability and robustness. It achieved a very good control effect when used in strip thickness control system that proved the correctness and effectiveness of the control method.
|
eng_Latn
| 790,000 |
The T(f; r) Summability Transform
|
The Taylor summability transform and some generalizations of this transform have been objects of recent study. The T(f; r) transform offers an interesting generalization of the Taylor transform and is defined in the following manner.
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Abstract A method, implementable on a digital computer, for fast writing of the transfer function matrix of a linear time invariant compartmental model in its symbolic expression is given. Theoretical fundamentals are proved, and a digital computer implementation of the procedure is given. An example is described.
|
eng_Latn
| 790,001 |
Well-posedness of Linear Integro-Differential Equations with Operator-valued Kernels
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We study linear integro-differential equations in Hilbert spaces with operator-valued kernels and give sufficient conditions for the well-posedness. We show that several types of integro-differential equations are covered by the class of evolutionary equations introduced in [R. Picard. A structural observation for linear material laws in classical mathematical physics. Math. Methods Appl. Sci., 32(14):1768-1803, 2009]. We therefore give criteria for the well-posedness within this framework. As an example we apply our results to the equations of visco-elasticity.
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This paper proposes a new approach for delay-dependent robust H ∞ stability analysis and control synthesis of uncertain systems with time-varying delay. The key features of the approach include the introduction of a new Lyapunov-Krasovskii functional, the construction of an augmented matrix with uncorrelated terms, and the employment of a tighter bounding technique. As a result, significant performance improvement is achieved in system analysis and synthesis without using either free weighting matrices or model transformation. Examples are given to demonstrate the effectiveness of the proposed approach.
|
eng_Latn
| 790,002 |
Identification of non-stationary continuous systems using modulating functions
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Abstract The identification of non-stationary multi-input multi-output continuous systems by the use of trigonometric modulating functions is considered. The time variable matrices to be identified are developed in polynomial form, and the fact that the product of a modulating function with these series also gives a modulating function is discussed. The proposed method avoids the necessity of knowledge and estimation of the initial conditions and signal derivatives.
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In this paper, we study the oscillations of a kind of second-order nonlinear delay differential equations with variable sign oscillation factors. Three sufficient conditions about the equation are obtained, which generalize the present oscillation results of second-order nonlinear differential equations and delay differential equations with invariable sign coefficients.
|
eng_Latn
| 790,003 |
Deceleration equipment of JK hoist
|
According to analysis of malfunction of JK hoist machine deceleration equipments, explains the necessity and working principle of adding backup deceleration equipments.
|
One way to compute optimal control in completely observable stochastic optimal control problems is to solve the Hamilton-Jacobi Equation. We propose to replace in the quasi linearization technique of Bellman [1] the step of inversion of a linear system of dimension n by several steps of n linear equations of dimension 1 in parallel or in sequence. We are then led to apply for instance splitting up methods-studied in particular in [3], [6], [8], [9]. We obtain what we call a decomposition scheme to approximate evolutive Hamilton-Jacobi Equation. We study convergence results as time steps converge to zero with compacity methods adapted from [4] and give some numerical results.
|
eng_Latn
| 790,015 |
Exact analytic solution to nonlinear dynamic system of equations for information propagation in complex networks
|
Abstract We present the exact analytic solution to the nonlinear dynamic system describing the information propagation process in complex networks. The method is to switch to the dynamic system of equations for the new variables defined according to the nonlinear terms appearing in the original dynamic system, and then, after combining relevant consistent condition of solution to reduce the dynamic system of equations for the newly defined variables to the knownly solvable nonlinear Bernoulli differential equation. Numerical comparisons between the purely numerical solution and the exact analytic solution confirm the crosscheck and mutual proof for both of the solutions. The presented exact analytic solution, which does not restrict the coefficients in the original dynamic system to merely constants, is thus suitable for the study of information propagation in networks with evolving structure and changing properties.
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Abstract In this work we study conditions for guaranteeing the nonnegativity of a discrete-time singular control system. A first approach can be found in the literature for general systems, using the whole coefficient matrices. Also, the particular case of matrices of index 1 has been treated by using a block decomposition and the group-projector of the matrix that gives the singularity to the system. In order to complete this study, an analysis of the nonnegativity of a singular control system for matrices having arbitrary index is done by means of the core–nilpotent decomposition. This technique allows us to reduce the size of the original matrices, improving the results where the whole coefficients are involved.
|
eng_Latn
| 790,016 |
Helicopter Transmission Modularization and Maintainability Analysis
|
Abstract : The objective of the transmission modularization analysis was to develop a methodology to evaluate helicopter transmission modularization and to demonstrate the feasibility, methods, design criteria, and cost effectiveness of modularization. A U.S. Army CH-54B helicopter was selected for the analysis and designs were completed for transmissions with seven, six, four and three modules. A mathematical model was derived that calculated the cost and performance characteristics of a helicopter with a modularized transmission. A computer program was written to implement the mathematical model.
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Abstract In this paper, we study a general problem of optimal error reduction in linear multivariable systems. We show how a symptotic regulation can be achieved along with minimization of the H∞ norm of the error transfer function matrix. These resulte are of significance in the development of a new approach to the design of multivariable control systems.
|
eng_Latn
| 790,017 |
Effect of pre treatment methods on fruits drying of grapes under warm air condition
|
In the present study, grapes pretreated with different concentrations of potassium carbonates plus olive oil and soy lecithin with different dipping times. A dryer was built to perform the experiment under controlled condition of drying air at temperature 50°C and velocity 1.0 m/s. Grapes dipped into 1percentage olive oil plus 6percentage K2CO3 emulsion, at 50°C for 2 min. prior to drying showed shorter drying times and comparatively good quality raisin, whereas grapes dipped into 1.5percentage soy lecithin, at same conditions resulted in a total drying time slightly higher than the most effective pre treatment. The drying rates of grapes were modeled by the page equations. Grapes that are naturally dried usually darken in colour, whereas dipped grapes stay yellow-green.
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Abstract In this work, we are concerned with the experimental implementation of linear adaptive predictive control algorithms over a continuous fermentation process. The regulation and tracking problem of the substrate concentration is considered. Our objective is to shown their advantages and drawbacks in terms of tracking and regulation behaviour, overtaking, number of tuning parameters. The two controllers described in this paper are Linear Quadratic Control law and Long - Range Predictive Control law with partial state reference model.
|
eng_Latn
| 790,031 |
PRACTICAL STABILITY OF LINEAR DELAY SYSTEMS AND LARGE-SCALE DELAY SYSTEMS
|
The practical stability theory, an important branch of stability theory, has been developed as a meaningful quantitative theory for the analysis of systems on the basis of the early works of N. G. Chetayev (1935, 1960), N. D. Moiseyev (1945), G. E. Melnikov (1956), J. P. LaSalle and S. Lefschetz (1961), et al. The investigations on this topic are mostly with the ordinary differential systems and discontinuous systems.
|
Summary form only given, as follows. A study is presented of precision constraints imposed by a hybrid chip architecture with analog neurons and digital backpropagation calculations. Conversions between the analog and digital domains and weight storage restrictions impose precision limits on both analog and digital calculations. It is shown through simulations that a learning system of this nature can be implemented in spite of limited resolution in the analog circuits and using fixed-point arithmetic to implement the backpropagation algorithm. >
|
yue_Hant
| 790,033 |
Fluctuating Lift and Drag Acting on a Cylinder in a Flow at Supercritical Reynolds Numbers
|
The fluctuating lift and drag acting on a circular cylinder in a flow of an incompressible fluid at large Reynolds numbers were measured. Data on the root-mean-square values of the lift and drag coefficients, the extreme values of these coefficients, and their power spectra at various Reynolds numbers are presented.
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In this paper, we study the asymptotical optimal solutions for the general airline revenue management problem, considering both customer cancelations and no-shows. We study a simple case where there is only one fare-class; the management controls the opening and closing of the fare-class, with the objective of maximizing the total revenue. We first develop a fluid control problem, where the customer arrival and cancelation processes are treated as deterministic, whereas the no. of no-shows is random. The optimal fluid solution is shown to have a simple structure of accepting up to a single time point t* and rejecting afterwards. We show that this policy acts as an upper bound for the MDP problem. Applying the optimal fluid solution to the stochastic environment, we show that this policy is asymptotically optimal on the fluid scaling.
|
eng_Latn
| 790,035 |
Program structure analysis in a global optimization
|
We described the solution of the analysis problem in the BETA multi-language system. The key moment here is joining the analysis algorithms at the isolated stage of the optimization phase. From our point of view, such a stage is necessary in any well-developed optimizing compiler for finding information and control connections and frequency relations between program objects. This stage can be considered as a result of applying to the optimization phase such an universal optimization algorithm as "unloading of repeated parts".
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Abstract In this paper, we study a general problem of optimal error reduction in linear multivariable systems. We show how a symptotic regulation can be achieved along with minimization of the H∞ norm of the error transfer function matrix. These resulte are of significance in the development of a new approach to the design of multivariable control systems.
|
eng_Latn
| 790,040 |
Stabilization and controllability of first-order integro-differential hyperbolic equations
|
In the present article we study the stabilization of first-order linear integro-differential hyperbolic equations. For such equations we prove that the stabilization in finite time is equivalent to the exact controllability property. The proof relies on a Fredholm transformation that maps the original system into a finite-time stable target system. The controllability assumption is used to prove the invertibility of such a transformation. Finally, using the method of moments, we show in a particular case that the controllability is reduced to the criterion of Fattorini.
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In this paper, a numerical method is given for solving fuzzy Fredholm integral equations of the second kind, by using Bernstein piecewise polynomial, whose coefficients determined through solving dual fuzzy linear system. Numerical examples are presented to illustrate the proposed method, whose calculations were implemented by using the Computer software MathCadV.14.
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eng_Latn
| 790,042 |
Digital Signal Processing Using MATLAB: A Problem Solving Companion
|
Help your student learn to maximize MATLAB as a computing tool to explore traditional Digital Signal Processing (DSP) topics, solve problems and gain insights. An extremely valuable supplementary text, DIGITAL SIGNAL PROCESSING USING MATLAB: A PROBLEM SOLVING COMPANION, 4E greatly expands the range and complexity of problems that students can effectively study in your course. Since DSP applications are primarily algorithms implemented on a DSP processor or software, they require a significant amount of programming. Using interactive software, such as MATLAB, makes it possible to place more emphasis on learning new and difficult concepts than on programming algorithms. This engaging supplemental text introduces interesting practical examples and shows students how to explore useful problems. New, optional online chapters introduce advanced topics, such as optimal filters, linear prediction, and adaptive filters, to further prepare your students for graduate-level success.
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This paper is concerned with a discrete-time mean-field stochastic linear-quadratic optimal control problem arising from financial application. Through matrix dynamical optimisation method, a group...
|
kor_Hang
| 790,052 |
Application of stochastic resonance technique detecting ship′s weak shaft-rate electric field signal
|
To solve the problem of remote detection of ship′s weak shaft-rate electric field signal in loud noise,a detection method was proposed based on stochastic resonance.Firstly,the basic principle of stochastic resonance was introduced based on which a model for detecting the weak periodic signal was presented.Then,a ship model′s shaft-rate electric field signal of low SNR was input to the detecting model and the power spectrum of the output signal was obtained.The result indicates that the stochastic resonance technique can detect the ship′s weak shaft-rate electric field signal in loud noise effectively and has much superiority over traditional methods in weak signal processing.Also,the influence of the parameters on the output power spectrum of the system was analyzed through the detection example.
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We study the problem of stabilizing a distributed linear system on a subregion of its geometrical domain. We are concerned with two methods: the first approach enables us to characterize a stabilizing control via the steady state Riccati equation, and the second one is based on decomposing the state space into two suitable subspaces and studying the projections of the initial system onto such subspaces. The obtained results are performed through various examples.
|
eng_Latn
| 790,057 |
Ruelle Operator Theorem for Nonexpansive systems
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The Ruelle operator theorem has been studied extensively both in dynamical systems and iterated function systems. In this paper we study the Ruelle operator theorem for non-expansive systems. Our theorems give some sufficient conditions for the Ruelle operator theorem to be held for a non-expansive system.
|
Turnovsky observes that “the rational expectations hypothesis has had a profound impact on macroeconomic theory and policy during the past decade.” Tracing briefly the evolution of the ideas involved, he concludes that “… a consensus view is emerging that in fact under quite plausible conditions the policy neutrality proposition does not hold; therefore, there is still scope for policy rules to play an important role in stabilizing output.”The mathematics used in the article is expository rather than analytical, requiring of the reader only somewhat more than the usual amount of persistence, faith in the author's interpretation of the literature, and a willingness to accept the integrity of economic models as representative of the real world. This is “required” reading for those teaching macroeconomics.
|
eng_Latn
| 790,066 |
Weak and strong stabilization of linear systems
|
We study the problem of stabilizing a distributed linear system on a subregion of its geometrical domain. We are concerned with two methods: the first approach enables us to characterize a stabilizing control via the steady state Riccati equation, and the second one is based on decomposing the state space into two suitable subspaces and studying the projections of the initial system onto such subspaces. The obtained results are performed through various examples.
|
AbstractIn this note we have proved the lifting properties on fibre bundle W under skew product flow π and established that if bounded solutions are positively uniformly stable then a π–invariant subset of W is minimal.
|
eng_Latn
| 790,070 |
Regimens for pediatric sedation.
|
Pediatric sedation is one of the most challenging areas of clinical practice. The goal of pediatric management is to accomplish treatment on a comfortable and cooperative child. While comfort may be achieved with or without drugs, cooperation may occasionally be achieved only when levels of sedation deepen to the point of obtunding the child. Anatomic and physiologic differences in the pediatric patient give high priority to airway management, oxygenation, and ventilation. Techniques for pediatric sedation and anesthesia are reviewed and recommendations are made for the rational selection of an appropriate pharmacological management technique.
|
We present a method for synthesising control strategies for continuous dynamical systems. We use Uppaal Tiga for the synthesis in combination with a set-based Euler method for guaranteeing that the synthesis is safe. We present both a general method and a method which provides tighter bounds for monotone systems. As a case-study, we synthesize a guaranteed safe strategy for a simplified adaptive cruise control application. We show that the guaranteed strategy is only slightly more conservative than the strategy generated in the original adaptive cruise control paper which uses a discrete non guaranteed strategy. Also, we show how reinforcement learning may be used to obtain optimal sub-strategies.
|
eng_Latn
| 790,074 |
Landau-Zener transition of a two-level system driven by spin chains near their critical points
|
The Landau-Zener (LZ) transition of a two-level system coupling to spin chains near their critical points is studied in this paper. Two kinds of spin chains, the Ising spin chain and XY spin chain, are considered. We calculate and analyze the effects of system-chain coupling on the LZ transition. A relation between the LZ transition and the critical points of the spin chain is established. These results suggest that LZ transitions may serve as the witnesses of criticality of the spin chain. This may provide a new way to study quantum phase transitions as well as LZ transitions.
|
The first problem in our third millennium is energy. For this raison, we try to find a new solution to develop different ways of distribution and energy use. This article presents the design of a sliding mode controller using sliding mode observation technique which aims to simplify the control procedure. For ameliorating the quality of the energy transferred from the power supply to the load, and minimizing the harmful effects of the harmonics generated by nonlinear load. The virtual grid flux vector estimated in the sliding-mode observer yields robustness against the line voltage distortions. We propose a new multi-function converter as an efficient solution to improve the power quality. The good dynamic and static performance under the proposed control strategy is verified by simulation and experiment .
|
eng_Latn
| 790,085 |
Nonnegative periodic dynamics of delayed Cohen-Grossberg neural networks with discontinuous activations
|
In this paper, we study the nonnegative periodic dynamics of the delayed Cohen-Grossberg neural networks with discontinuous activation functions and periodic interconnection coefficients, self-inhibitions, and external inputs. Filippov theory is utilized to study the viability, namely, the existence of the solution of the Cauchy problem. Under some conditions, the existence and the asymptotical stability of a periodic solution are derived. Numerical examples are provided to illustrate the theoretical results.
|
Abstract In this paper, we analyze photometry of V504 Cyg semi-detached binary system. For this purpose, after taking the photometric data, primary and secondary minimum and new epoch were calculated. The period of system is found to be 0.3516916 day. Analysis of light curve was performed by PHOEBE software which uses last version of Wilson–Devinney code. 3D model of the system is worked out using Binary Maker software. The O’Connell effect in the light curve is observed and an accurate model of this system is presented by introducing four spots on the components.
|
eng_Latn
| 790,091 |
Four-quadrant current-regulated DC servo drive using a fuzzy logic-based controller
|
DC servo drives normally employ an internal current loop as well as a speed control loop requiring the use of a speed transducer. This paper presents a fuzzy logic controlled DC servo drive without the need for mechanical speed sensors. Speed estimation is performed from measurements of the input current and voltage to the motor. The latter is driven by a current-regulated voltage source DC-DC converter capable of operating in all four quadrants of the torque-speed plane. The fuzzy controller uses the calculated rotor speed to produce the armature current command necessary for matching the reference speed profile. The proposed system is shown to track the dynamic input speed settings and to reject step load disturbances with largely reduced settling times and steady state errors.
|
We experimentally stabilize a chaotic output of a diode-laser-pumped Nd:yttrium–aluminum–garnet laser by using oscillation quenching. When the chaotic laser is mutually coupled with a Rossler oscillator that is implemented by an electronic circuit, both chaotic systems are stabilized to steady states. We experimentally study the route to the steady states as the coupling strength increases, and numerically confirm the route by coupling Lorenz and Rossler oscillators mutually.
|
eng_Latn
| 790,096 |
Control System Design for Reentry Warhead with Mass Moment Compound Actuate
|
A variable structure control system is designed for the reentry warhead with mass moment compound actuate.The roll is subject to moving-masses movement and asymmetric ablation and erosion experienced by aerodynamic in reentry process.In order to curb these interferences,roll control law is design by using of time optimal with sliding mode,the problem of switch high frequency is solved by constructing two switch functions and switching continuous control law near the equilibrium point.To overcome the interference on warhead result from mass movement,the pitch and yaw attitude control law are designed by using variable structure control method based on the layout optimization of masses.Simulation results are presented which show that the feasibility of proposed method in this paper.
|
The reactor pressure vessel FE model with 42 M88 bolts is built in this study by ADVEN-TURECluster.These 42 bolts are divided into seven groups,and there are two steps in the bolt-up process.The simulation results show that every bolt-up step will make different influence to different groups of bolts.
|
eng_Latn
| 790,097 |
A model-free PID tuning to slosh control using simultaneous perturbation stochastic approximation
|
This paper addresses an initial study of a modelfree PID tuning based on simultaneous perturbation stochastic approximation (SPSA) for liquid slosh control. The SPSA method is used to optimize the PID parameters such that the liquid slosh is minimized. In order to validate our model-free design, a liquid slosh model is considered to represent the lateral slosh motion. The simulation results demonstrate that the proposed model-free method has a good potential in reducing the liquid slosh without explicitly modeling the liquid slosh behavior.
|
In an earlier paper by the author the problem of determining the optimum symmetrical weighting factors for a video MTI radar was discussed. This paper extends this work so as to remove the symmetrical restriction from the problem. In addition, for a staggered pulse system, optimum times of transmission are determined. In the earlier paper a global solution to the restricted optimization problem was achieved. In this paper only a locally optimum solution is achieved for the more general problem.
|
eng_Latn
| 790,102 |
Agglomeration during precipitation: I. Tracer crystals for Al(OH)3 precipitation
|
Tracer crystals are developed to study the agglomeration, growth and residence time behavior of gibbsite crystals, an industrially important polymorph of Al(OH)3, in continuous and batch precipitation. Satisfactory tracer crystals contain detectable amounts of Zn and have the crystal structure of gibbsite. The tracer crystals behave in the same manner during precipitation as the nontracer Al(OH)3 crystals. The application of the tracer crystals for investigating, both batch and continuous, seeded Al(OH)3 precipitation is demonstrated. The tracer experiments provide information on the growth and agglomeration kinetics of different size fractions. The tracers are a useful tool for the quantitative investigation of solid-phase residence time distributions within a crystallizer.
|
Abstract In this work, we are concerned with the experimental implementation of linear adaptive predictive control algorithms over a continuous fermentation process. The regulation and tracking problem of the substrate concentration is considered. Our objective is to shown their advantages and drawbacks in terms of tracking and regulation behaviour, overtaking, number of tuning parameters. The two controllers described in this paper are Linear Quadratic Control law and Long - Range Predictive Control law with partial state reference model.
|
eng_Latn
| 790,126 |
Simulation Analysis of Clamping Mechanism of 4500t Die Casting Machine
|
Firstly,the working principle of the clamping mechanism of a die casting machine is introduced,and the comprehensive analysis of the clamping mechanism is conducted.The mathematical model is established and the key parts'motion formula is got.Using 3Dmodeling software,the 3Dmodel of the clamping mechanism is set up,and the kinematic simulation analysis of the die casting machine based on the actual working conditions using ADAMS software is carried on,the optimal critical angle of clamping mechanism is given.By using the software ABAQUS,the mechanism strength analysis is got which verifies the rationality of the clamping structure.It provides the guarantee for stable work of the die casting machine in practice.
|
We present a method for synthesising control strategies for continuous dynamical systems. We use Uppaal Tiga for the synthesis in combination with a set-based Euler method for guaranteeing that the synthesis is safe. We present both a general method and a method which provides tighter bounds for monotone systems. As a case-study, we synthesize a guaranteed safe strategy for a simplified adaptive cruise control application. We show that the guaranteed strategy is only slightly more conservative than the strategy generated in the original adaptive cruise control paper which uses a discrete non guaranteed strategy. Also, we show how reinforcement learning may be used to obtain optimal sub-strategies.
|
eng_Latn
| 790,128 |
A FORMAL [3 + 2] CYCLOADDITION STRATEGY FOR THE SYNTHESIS OF UNIQUE CLASS OF DISPIROHETEROCYCLES
|
Novel dispiropyrrolidines and dispiropyrrazolidines have been prepared in good yields using highly regioselective cycloaddition reaction of azomethine ylides with diversely substituted (E)-3-arylidene-chroman-4-ones.
|
In this study the proximity hovering orbital dynamic model and control method are investigated. This dynamic model, constructed on the orbit elements, gives the relative motion between the chief satellite and the deputy satellite in the space. The continuous closed-loop orbital control law is developed based on the dynamic model, which means that through continuous limited thrust control the deputy satellite would transfer into a new maneuvering orbit, not the natural Kepler orbit. The simulation result shows the effectiveness of this dynamic model and the control law. The deputy satellite can proximity hover around the chief satellite with a little energy consume (3.79m/s velocity increment) when the desired radial distance is 500m during one orbit period.
|
yue_Hant
| 790,134 |
Optimal state feedback control of brushless direct-current motor drive systems based on Lyapunov stability criterion
|
This paper develops a unified methodology for a real-time speed control of brushless direct-current motor drive systems in the presence of measurement noise and load torque disturbance. First, the mathematical model and hardware structure of system is established. Next, an optimal state feed back controller using the Kalman filter state estimation technique is derived. This is followed by an adaptive control algorithm to compensate for the effects of noise and disturbance. Those two algorithms working together can provide a very-high-speed regulation and dynamic response over a wide range of operating conditions. Simulated responses are presented to highlight the effectiveness of the proposed control strategy.
|
In this article, we study a piecewise smooth dynamical system inspired by a previous reduced system modeling compartimentalized brain metabolism. The piecewise system allows the introduction of an autoregulation induced by a feedback of the extracellular or capillary Lactate concentrations on the Capillary Blood Flow. New dynamical phenomena are uncovered and we discuss existence and nature of two equilibrium points, attractive segment, boundary equilibrium and periodic orbits depending of the Capillary Blood Flow.
|
eng_Latn
| 790,139 |
Controllable amplitude-to-phase distortion in high-speed photodiodes under pulsed illumination
|
We show <-50 dB AM-to-PM conversion over a wide photocurrent range in MUTC photodiodes. By controlling the AM-to-PM coefficient minimum, we generate 15 dBm microwave power with 60 dB AM rejection onto the microwave phase.
|
In this paper, we present a modified backstepping sliding mode control to deal with Euler–Lagrange systems. The controller is applied in an underwater vehicle in order to show the effectiveness of the approach proposed. Instantaneous power data provided by the propulsion system are used to tune the controller in order to guarantee robust performance and energy saving. Thanks to the combination of an internal Proportional Integral and Derivative (PID) controller, it is possible implement high gains to deal with the influence of disturbances and uncertainties. A comparative study among this backstepping sliding mode controller and standard sliding mode controls is presented.
|
eng_Latn
| 790,142 |
Nature of amino acid substitutions in homologous proteins during evolution
|
Abstract Replacement substitutions of mitochondrial cytochrome c and α- and β-chains of haemoglobin have been studied by considering the structural similarity among amino acid residues at the secondary and tertiary structural levels. Secondary structural similarity explains ∼70% while tertiary structural similarity explains ∼50% of observed replacements for most of the cases. These structural similarities could not account for all the replacement substitutions. The study was extended to consider the composition of codons, and the chemical nature and polarity of the replacing and replaced residues. These also could not individually account for all the affected replacements. In general, no property of amino acid residues is conserved for substitutions occurring at any single position during evolution of proteins.
|
This paper addresses the application of convergence rules of gradient-type discrete algorithms to discrete adaptive control algorithms for linear timeinvariant systems, which are based on Lyapunov's like functions , in order to improve the transient performances based on fast adaptation . In particular, the adaptation covergence is increased as a generalized or filtered error increases through the application of Armijo rule for regulating the decrease of each Lyapunov's-like function on which the particular adaptation algorithm is based. The proposed scheme can be implemented with minor modifications in systems subject to unmodelled dynamics if some weak knowledge on such a dynamics is available consisting of upper-bounds of the dimension and norm of the unmodelled parameter vector.
|
eng_Latn
| 790,149 |
Admissible initial value sets and dynamic feedback control of nonlinear differential-algebraic systems
|
In this paper, the admissible initial value set and dynamic feedback control of nonlinear differential-algebraic systems are considered. An algorithm to calculate the admissible initial value set is given. Based on the algorithm, the differential-algebraic system can be transformed to a standard state space system constrained in an invariant set. If the standard state space system constrained in the invariant set can be stabilized then the original differential-algebraic system can be stabilized by a dynamic feedback controller.
|
The present study focuses on the thermodynamic analysis of zeolite–water and activated carbon–ethanol based adsorption cooling systems. The performance of the system depends critically on four operating temperatures namely maximum desorption temperature, minimum adsorption temperature, condensing temperature, and evaporating temperature and also on the ratio of specific heat of structural material and the specific heat of adsorbent. Dubinin–Astakhov equation is used to estimate the equilibrium uptake of working pairs. A comparative study is made between these working pairs for the air-conditioning applications.
|
eng_Latn
| 790,158 |
Dynamic flight stability of a model dronefly in vertical flight
|
The dynamic flight stability of a model dronefly in hovering and upward flight is studied. The method of computational fluid dynamics is used to compute the stability derivatives and the techniques of eigenvalue and eigenvector used to solve the equations of motion. The major finding is as following. Hovering flight of the model dronefly is unstable because of the existence of an unstable longitudinal and an unstable lateral natural mode of motion. Upward flight of the insect is also unstable, and the instability increases as the upward flight speed increases. Inertial force generated by the upward flight velocity coupled with the disturbance in pitching angular velocity is responsible for the enhancement of the instability.
|
We study the problem of stabilizing a distributed linear system on a subregion of its geometrical domain. We are concerned with two methods: the first approach enables us to characterize a stabilizing control via the steady state Riccati equation, and the second one is based on decomposing the state space into two suitable subspaces and studying the projections of the initial system onto such subspaces. The obtained results are performed through various examples.
|
eng_Latn
| 790,163 |
Research and simulation of dynamic models for drum boiler
|
This paper introduces one kind of drum type boiler dynamic model structure, which considering the system nonlinearity. The dynamic model structure is introduced, and the equations that can solve the unknown parameters are given. In order to construct a new coordinated control system (CCS), the dynamic predicting equations of the load/pressure increment are concluded. The simulation results have illustrated the efficiency of the dynamic model and predict equations.
|
In this paper, we present a modified backstepping sliding mode control to deal with Euler–Lagrange systems. The controller is applied in an underwater vehicle in order to show the effectiveness of the approach proposed. Instantaneous power data provided by the propulsion system are used to tune the controller in order to guarantee robust performance and energy saving. Thanks to the combination of an internal Proportional Integral and Derivative (PID) controller, it is possible implement high gains to deal with the influence of disturbances and uncertainties. A comparative study among this backstepping sliding mode controller and standard sliding mode controls is presented.
|
eng_Latn
| 790,170 |
An ε-Optimal Portfolio with Stochastic Volatility
|
We consider an extended Merton's problem of optimal consumption and investment in continuous-time with stochastic volatility. The wealth process of the investor is approximated by a particular weak Ito-Taylor approximation called Euler scheme. It is shown that the optimal control of the value function generated by the Euler scheme is an e-optimal control of the original problem of maximizing total expected discounted HARA utility from consumption.
|
In this paper, we study the polynomial stabilization for a system of magnetoelastic plates. Linear and nonlinear models are considered. The polynomial stability is obtained by means of a new multiplier given by a first-order hyperbolic problem.
|
eng_Latn
| 790,215 |
Norwegian University of Science and Technology Controllability of Processes with Large Gains
|
Abstract There is some disagreement in the literature on whether large plant gains are a problem or not when it comes to input-output controllability. In this paper, the effect of two kinds of input errors is studied and controllability requirements are derived. First, input disturbances are studied. These may pose a problem if the plant gain is large at high frequencies. Second, we study the nonlinear effect of limited input resolution which causes limit cycle behavior similar to that found with relay feedback. The magnitude of these limit cycles depends on the high-frequency process gain, but is independent of the controller tuning. They can be reduced by pulse modulating the input signal, but this may cause excessive input movement. In summary, large gains at frequencies corresponding to the closed-loop bandwidth may cause control problems, but large steady-state gains are not by themselves a problem.
|
The system of nonstate-run higher education is a new phenomenon in the history of our country. Today we are witnesses to and participants in this social institution.
|
eng_Latn
| 790,217 |
New non-equilibrium cobweb dynamical evolution model and its application
|
A new cobweb model is built under price adjustment situation. Its price correction function considers the dynamic effects of regulation. Accuracy and authenticity of the analysis are increases. The new model is applied to the analysis of stability of power's supply and demand. An empirical analysis is carried out to study electricity power market in Jiangsu province and Shandong province in China. Results from the new model are not identical with the old one. The new model performs better in showing the dynamic effects with price changes and the dynamic law system. Furthermore, the stability for the new cobweb model without considering external influences is also considered. The study shows the stability of new model by numerical analysis. Probability of stability is given.
|
We prove existence of solutions for a class of systems of subelliptic PDEs arising from Mean Field Game systems with H\"ormander diffusion. These results are motivated by the feedback synthesis Mean Field Game solutions and the Nash equilibria of a large class of $N$-player differential games.
|
eng_Latn
| 790,220 |
Semi-Implicit Runge-Kutta Schemes For The Navier-Stokes Equations
|
The stationary Navier-Stokes equations are solved in 2D with semi-implicit Runge-Kutta schemes, where explicit time-integration in the streamwise direction is combined with implicit integration in the body-normal direction. For model problems stability restrictions and convergence properties are studied. Numerical experiments for the flow over a flat plate show that the number of iterations for the semi-implicit schemes is almost independent of the Reynolds number.
|
We present a method for synthesising control strategies for continuous dynamical systems. We use Uppaal Tiga for the synthesis in combination with a set-based Euler method for guaranteeing that the synthesis is safe. We present both a general method and a method which provides tighter bounds for monotone systems. As a case-study, we synthesize a guaranteed safe strategy for a simplified adaptive cruise control application. We show that the guaranteed strategy is only slightly more conservative than the strategy generated in the original adaptive cruise control paper which uses a discrete non guaranteed strategy. Also, we show how reinforcement learning may be used to obtain optimal sub-strategies.
|
eng_Latn
| 790,224 |
Null Controllability —Discrete-Time Systems
|
This chapter studies null controllability of discrete-time linear systems with bounded controls. As in the continuous-time case, when the control input is limited by the actuator saturation, a discrete-time linear controllable system might not be globally null controllable. We are thus led to the characterization of the null controllable regionCthe set of all states that can be steered to the origin by the bounded controls delivered by the actuators
|
We continue the study of bottom-up unranked tree automata with equality and ::: disequality constraints between direct subtrees. In particular, we show that ::: the emptiness problem for the nondeterministic automata is decidable. In ::: addition, we show that the universality problem, in contrast, is undecidable.
|
eng_Latn
| 790,246 |
Almost Periodic Solution for Some Delay Integral Equation
|
The existence of all kinds of solutions for integral equations becomes important research topics in the study fields of integral equations. Since this kind of equation was established about epidemic problem early,almost periodic type solutions were discussed for the kind of equation with the constant delay by relevant literature. The existence of almost periodic solution is investigated for this kind of integral equation with the delay by constant into dependence on argument by some fixed point theorem on Hilbert projective metric in this paper,. Thus,this kind of integral equation can be used more widely.
|
Model matching control of singular perturbation systems with unmodeled high-frequency dynamics is examined. It is shown that the controller designed on the basis of the reduced-order model is able to make the full system match the stable model for sufficiently small values of the singular perturbation parameter epsilon . The maximum value of epsilon is calculated. >
|
eng_Latn
| 790,248 |
Place-labelled Petri net controlled grammars
|
A place-labelled Petri net (pPN) controlled grammar is a context-free grammar equipped with a Petri net and a function which maps places of the net to the productions of the grammar. The language consists of all terminal strings that can be obtained by simultaneously applying the rules of multisets which are the images of the sets of the input places of transitions in a successful occurrence sequence of the Petri net. In this paper, we study the generative power and structural properties of pPN-controlled grammars. We show that pPN-controlled grammars have the same generative power as matrix grammars. Moreover, we prove that for each pPN-controlled grammar, we can construct an equivalent place-labelled ordinary net controlled grammar.
|
On the base of analyzing the control problem for the traffic signals at the grade crossings, a multi-phase and multi-stage fuzzy control plan is presented according to the vehicle induction control theory and fuzzy control theory. The simulation results show that the proposed method is superior to the multi-phase static period control.
|
eng_Latn
| 790,251 |
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