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Mathematics, Postdoc, Vancouver, Ecology, Numerical Analysis.
ecological and physiological phenomena (which I find particular joy in). Currently, my research involves the study of line source regularisations and mathematical modelling of nordic skiing. Snowman building on a snowshoe hike through Gatineau Park, Québec. What does research and life balance mean | medium | 3,046 |
Mathematics, Postdoc, Vancouver, Ecology, Numerical Analysis.
to you? “I am large, I contain multitudes,” (Whitman, Song of Myself, 51) strongly resonates with me, as my passions span across mathematics and community service, as well as other activities such as art, reading, and physical activity. Spending time at Winnipeg Beach in particular, where I have | medium | 3,047 |
Mathematics, Postdoc, Vancouver, Ecology, Numerical Analysis.
been going with family and friends my whole life, holds a special place in my heart. As a wife, sister, auntie, daughter, granddaughter, and cousin, I enjoy fulfilling my many roles in my family. To me, achieving balance between research and life means embracing all of my multitudes. What has been | medium | 3,048 |
Mathematics, Postdoc, Vancouver, Ecology, Numerical Analysis.
your best discovery since arriving at SFU? What are you looking forward to learning/ seeing about Vancouver and your postdoctoral position at the university? I highly value the Applied Math Working Seminar held regularly here, which provides a great opportunity for graduate students, postdoctoral | medium | 3,049 |
Mathematics, Postdoc, Vancouver, Ecology, Numerical Analysis.
fellows, and faculty to discuss ongoing research. The seminar fosters interesting discussions and helps me connect with the community. This summer, I plan to explore the city, go on hikes in the mountains and islands, and teach a numerical analysis course. Teaching always brings new insights, even | medium | 3,050 |
Mathematics, Postdoc, Vancouver, Ecology, Numerical Analysis.
when you’re teaching linear algebra for the umpteenth time. I’m excited to see how it helps me grow as a mathematician and teacher. Hanging with our family dog, Ginger, at Winnipeg Beach. Jane will be speaking at the PIMS Emergent Research Seminar Series, on April 26, 2023, at 9:30 AM Pacific. | medium | 3,051 |
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the insurance obtains the right to sell bonds issued by the company for their face value when a credit event occurs and the seller of the insurance agrees to buy the bonds for their face value when a credit event occurs. The face value (or par value) of a coupon-bearing bond is the principal amount | medium | 3,058 |
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in the credit default swap market. When quoting on a new 5-year credit default swap on a company, a market maker might bid 150 basis points and offer 160 basis points. This means that the market maker is prepared to buy protection by paying 150 basis points per year (i.e., 1.5% of the principal per | medium | 3,067 |
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year) and to sell protection for 160 basis points per year (i.e., 1.6% of the principal per year). Many different companies and countries are reference entities for the CDS contracts that trade. Under the most popular arrangement, payments are made quarterly in arrears. Contracts with maturities of | medium | 3,068 |
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initiated is close to, but not necessarily the same as, the number of years to maturity that is specified. Suppose you call a dealer on November 15, 2023, to buy 5-year protection on a company. The contract would probably last until December 20, 2028. Your first payment would be due on December 20, | medium | 3,070 |
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creditors agree to a partial payment of their claims: In other cases, the assets are sold by the liquidator and the proceeds are used to meet the claims as far as possible. Some claims typically have priority over other claims and are met more fully. The recovery rate for a bond is normally defined | medium | 3,079 |
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as the bond’s market value immediately after a default, as a percent of its face value. The recovery rate on a bond is defined as the value of the bond immediately after default as a percent of face value. This means that the payoff from a CDS is L(1 — R), where L is the notional principal and R is | medium | 3,080 |
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the recovery rate. 5. Loss Given Default (LGD) The loss given default (LGD) is the complement to 1 of the recovery rate. Theoretically, LGD can take any value between 0% and 100%. In other words, LGD equals one minus the recovery rate (R). A fairly standard assumption in the derivatives market is a | medium | 3,081 |
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0.0154. The total actuarial present value of the expected payoffs is $0.0778. df3 = df1.copy() df3.drop(['Conditional Survival Probability'], axis=1, inplace=True) df3['Time (years)'] = 0.00 for i in range(0, len(df['Time (years)'])): df3['Time (years)'][i] = df1['Time (years)'][i]-0.5 df3['LGD'] = | medium | 3,097 |
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(years)'])): df4['Time (years)'][i] = df1['Time (years)'][i]-0.5 df4['Expected Accrual Payment'] = (df4['Conditional Default Probability'] * 0.5).round(4) df4['Financial Discount Factor'] = (1 * np.exp(-r*df4['Time (years)'])).round(4) df4['APV of Expected Accrual Payment'] = (df4['Expected Accrual | medium | 3,102 |
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Survival Probability'] = (1-pd) df1 = df.copy() df1['Conditional Default Probability'] = (df1['Unconditional Default Probability']).round(4) df1['Conditional Survival Probability'] = 0.000 for i in range(0, len(df1['Time (years)'])): df1['Conditional Survival Probability'][i] = ((df1['Unconditional | medium | 3,122 |
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company buys insurance against another company defaulting on its obligations. The payoff is usually the difference between the face value of a bond issued by the second company and its value immediately after a default. Credit default swaps can be analyzed by calculating the actuarial present value | medium | 3,133 |
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headquartered in Rishon LeZion, Israel. He is also the Owner and Chief Data Scientist of Prediction Consultants, a consulting firm that specializes in advanced analysis and model development. Over more than 17 years, he has performed credit risk actuarial science consulting engagements in the areas | medium | 3,136 |
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spreads), credit expected losses and credit unexpected losses and credit VaR. Mr. Polanitzer holds an undergraduate degree in economics and a graduate degree in business administration, majoring in finance, both from the Ben-Gurion University of the Negev. He is a Full Actuary (Fellow), a Certified | medium | 3,139 |
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Accredited in Deep Learning (ADL) and a Professional Data Scientist (PDS) by the Professional Data Scientists’ Israel Association (PDSIA). Mr. Polanitzer is the Founder of the PDSIA and currently serves as its CEO. He is the editor of IAVFA’s weekly newsletter since its inception (primarily for the | medium | 3,142 |
Wearables, Healthcare, Wearable Technology, Technology, Tech.
The conventional patient-doctor model is undergoing a drastic change. Technological innovations such as Wearable app development in Healthcare is bringing about the change in diagnosis and treatment, as well as patient monitoring. Wearable devices connected to the Internet of Things are | medium | 3,145 |
Wearables, Healthcare, Wearable Technology, Technology, Tech.
transforming healthcare ecosystem at a phenomenal pace, creating a whole new world of digital medicine. Healthcare wearable app development is a rapidly growing area in emerging technologies. Here are a few statistics that show the growth of wearables: “Tractica forecasts an increase of the | medium | 3,146 |
Wearables, Healthcare, Wearable Technology, Technology, Tech.
wearables devices until 2021, with total shipments for all wearable devices to 560 million in 2021, which means an estimated device revenue of $95.3 billion in 2021” (wearable technologies) By 2021, Gartner estimates that sales of smartwatches will total nearly 81M units — representing 16% of total | medium | 3,147 |
Wearables, Healthcare, Wearable Technology, Technology, Tech.
wearable device sales, according to its forecast (Techcrunch) Such growth is attributed to several factors such as advancements in technologies and medical equipment, as well as proliferation of smartphones, followed by the healthcare mobile application development. Another reason is that people | medium | 3,148 |
Wearables, Healthcare, Wearable Technology, Technology, Tech.
have become much more aware of their health and are willing to utilize wearables in their everyday lives. Often worn as accessories or implantables on the body to collect data, wearables are user-centric. The industrial application in the field of wearable technology is already extensive. Factors | medium | 3,149 |
Wearables, Healthcare, Wearable Technology, Technology, Tech.
Leading to the Rise of Medical Wearables Increasing number of smart devices and connected world via IoT Increased awareness about health and well being Integration of sensors into consumer devices Ability to get timely medical support Interest and investment of tech giants such as Apple, Google and | medium | 3,150 |
Wearables, Healthcare, Wearable Technology, Technology, Tech.
Microsoft Wearable Medical Devices Wearable health monitoring devices allow the creation of a unique branch of healthcare namely telehealth. This field involves “use of digital information and communication technologies, such as computers and mobile devices, to access health care services remotely | medium | 3,151 |
Wearables, Healthcare, Wearable Technology, Technology, Tech.
and manage your health care.” The main benefit of telehealth is that the information about patient health conditions can be gathered anytime, anywhere outside the clinical settings, which saves time and most importantly lives. More and more people use smartwatches and fitness trackers to monitor | medium | 3,152 |
Wearables, Healthcare, Wearable Technology, Technology, Tech.
vitals and overall well-being, while patients are provided with devices to monitor and control diseases to take proactive steps to mitigate possible consequences. Wearable devices in healthcare allow doctors to provide complete attention to each patient without spending much time. Wireless data | medium | 3,153 |
Wearables, Healthcare, Wearable Technology, Technology, Tech.
transmission and alert mechanisms allow quick submission of notification to the hospital or your medical practitioner. This allows to initiate quick measures immediately in case of early symptoms. Wearable technology in healthcare includes several devices that can be categorized into different | medium | 3,154 |
Wearables, Healthcare, Wearable Technology, Technology, Tech.
sections mentioned below Types of Wearables in Healthcare Fitness Trackers Body Sensors Wearable Patches Wrist Devices Heart Straps Headbands Posture Monitors Movement Sensors Wearable Defibrillator Smart Clothing Smart Glasses Wearable Camera Monitoring and Diagnostic Devices Therapeutic Devices | medium | 3,155 |
Wearables, Healthcare, Wearable Technology, Technology, Tech.
Digital medicine is an efficient way to overcome the communication barrier between patients and doctors and enhance healthcare service delivery. Increasing Range of Wearable Devices Smartwatches and trackers on the wrist are getting the most attention of wearable app development. Some smart | medium | 3,156 |
Wearables, Healthcare, Wearable Technology, Technology, Tech.
implants are gaining popularity, expanding the range of medical wearables to helps patients control their health and monitor fitness using helmets, hearing devices, smart glasses, smart clothing and footwear, skin patches, implantable sensors and more. Currently, in order to improve the range of | medium | 3,157 |
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medical wearables the trend is to invent more devices for different parts of the body. In the future, a person will control health vital and monitor their fitness from tip to toe with a complete suite of wearable devices such as smart helmets, hearing aids, eyewear, smart clothing and footwear, | medium | 3,158 |
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fitness bands, implantable sensors and more. Increasing Sophistication of Wearable Devices First generation of wearables were bulky and difficult to use. This discouraged consumers from using wearables. However, wearables now are getting smaller and highly advanced. Many wearables are designed such | medium | 3,159 |
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that they can be used as accessories and on different parts of the body making wearable either fashionable or undetectable. Wearables have turned out to be so tiny that they are almost invisible under your clothes or even on your body. The main goal of this trend is to make devices more compact and | medium | 3,160 |
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lightweight, and consequently agile and affordable for every person. The relatively smaller devices are, the more likely people will engage. Paradigm Shift to Preventive Approach This is especially true in healthcare. Wearables completely changes the perspective of medicine from reactive (for a | medium | 3,161 |
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patient already sick and requires treatment) to preventive (for a patient who is healthy and needs to take measures to avoid falling sick). This approach can significantly reduce healthcare costs and increase the quality of life and overall well being. Healthcare Technology: A Futuristic Approach | medium | 3,162 |
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Wearables play a crucial role in preventing diseases as well as monitoring. The focus is towards providing real-time feedback and helping with rehabilitation and assisting in adhering to a fitness plan. Originally published at https://www.hiddenbrains.com on August 13, 2019. | medium | 3,163 |
Nano, Nanotechnology, Technology, Science, Research.
Nanotechnology & nanomaterials biweekly vol.11, 2nd November — 16th November TL;DR Researchers have developed a technique whereby they can spontaneously encapsulate microscopic droplets of water and oil emulsion in a tiny sphere made of salt crystals — sort of like a minute, self-constructing | medium | 3,164 |
Nano, Nanotechnology, Technology, Science, Research.
origami soccer ball filled with liquid. The process, which they are calling ‘crystal capillary origami,’ could be used in a range of fields from more precise drug delivery to nanoscale medical devices. Scientists in Australia have used tin mono-sulfide (SnS) nanosheets to create the thinnest X-ray | medium | 3,165 |
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detector ever made, potentially enabling real-time imaging of cellular biology. The article “Reaching silicon-based NEMS performances with 3D printer nanomechanical resonators” published in Nature Communications shows how it is possible to obtain mechanical nanoresonators from 3D printing with | medium | 3,166 |
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figures of merit such as quality factor, published stability, mass sensitivity and strength comparable to those of silicon resonators. A team of researchers affiliated with a host of entities in China and one in the U.S. has developed a modified textile that can keep skin cooler than materials made | medium | 3,167 |
Nano, Nanotechnology, Technology, Science, Research.
of cotton. In their paper published in the journal Nature Nanotechnology, the group describes their approach to developing garments that are cooler when worn in outdoor conditions. A new imaging technique developed by the teams of Professors Jinyang Liang and Fiorenzo Vetrone at the Institut | medium | 3,168 |
Nano, Nanotechnology, Technology, Science, Research.
national de la recherche scientifique (INRS) can quickly measure temperature in 2D without contact. The results of their research were published in the journal Nature Communications. This accurate, real-time temperature detection could one day improve photothermal therapy and help in the early | medium | 3,169 |
Nano, Nanotechnology, Technology, Science, Research.
diagnosis of skin cancers. Researchers in Korea succeeded in developing a core material for the next-generation neuromorphic (neural network imitation) semiconductor for the first time in the country. Scientists at St Petersburg University, Sirius University of Science and Technology, and St | medium | 3,170 |
Nano, Nanotechnology, Technology, Science, Research.
Petersburg Academic University have synthesized the smallest nano-sized metal-organic frameworks to detect heavy metal ions in water. The results and outcomes of the experiments and description of the properties of the crystals are published in Nanomaterials. Global drinking water scarcity is a | medium | 3,171 |
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severe problem for humans. Water purification consumes a large amount of fossil energy and generates secondary pollution. Solar-thermal interfacial evaporation has been considered the most promising strategy for addressing this problem. However, developing an optimized material featuring both | medium | 3,172 |
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efficient solar-vapor conversion and good environmental tolerance still remains challenging. Researchers have developed an ultra-stable amorphous Ta2O5/C nanocomposite with a hollow multishelled structure (HoMS) for solar evaporation, which can improve the efficiency of water purification. | medium | 3,173 |
Nano, Nanotechnology, Technology, Science, Research.
Recently, researchers developed high-performance solar thermal copper sulfide photothermal ink and photothermal film, marking big progress in the field of Plasmonic Solar photothermal Materials. In a new publication from Opto-Electronic Advances, researchers from Ontario Tech University, Ontario, | medium | 3,174 |
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Canada, discuss hybrid artificial neural networks and analytical model for prediction of optical constants and bandgap energy of 3D nanonetwork silicon structures. And more! Nanotech Market Nanotechnology deals with the ability to see, understand, measure, predict, produce or control matter at | medium | 3,175 |
Nano, Nanotechnology, Technology, Science, Research.
nanoscale (below 100 nanometers). The realm of nanotechnology lies between 0.1 and 100 nanometers, wherein a nanometer is defined as one thousandth of a micron. As a versatile technology with widespread applications in a wide range of end-use sectors, nanotechnology is currently facing a mixed bag | medium | 3,176 |
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of challenges and opportunities as the COVID-19 pandemic continues to spread across the globe. With the world fighting its biggest public health crisis in history, nanotechnology healthcare applications are storming into the spotlight led by the focus on nano intervention in terms of designing | medium | 3,177 |
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effective ways to identify, diagnose, treat and eliminate the spread of COVID-19 infections. Their role as nanocarriers has potential to design risk-free and effective immunization strategies. In the post COVID-19 period, use of nanotechnology solutions in the production of a multitude of devices & | medium | 3,178 |
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products will continue to grow. Amid the COVID-19 crisis, the global market for Nanotechnology estimated at US$42.2 Billion in the year 2020, is projected to reach a revised size of US$70.7 Billion by 2026, growing at a CAGR of 9.2% over the analysis period. Nanocomposites, one of the segments | medium | 3,179 |
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analyzed in the report, is projected to record a 8.7% CAGR and reach US$35.4 Billion by the end of the analysis period. After a thorough analysis of the business implications of the pandemic and its induced economic crisis, growth in the Nanomaterials segment is readjusted to a revised 10.1% CAGR | medium | 3,180 |
Nano, Nanotechnology, Technology, Science, Research.
for the next 7-year period. Latest News & Researches Crystal capillary origami capsule with self-assembled nanostructures by Kwangseok Park, Hyoungsoo Kim in Nanoscale Researchers have developed a technique whereby they can spontaneously encapsulate microscopic droplets of water and oil emulsion in | medium | 3,181 |
Nano, Nanotechnology, Technology, Science, Research.
a tiny sphere made of salt crystals — sort of like a minute, self-constructing origami soccer ball filled with liquid. The process, which they are calling ‘crystal capillary origami,’ could be used in a range of fields from more precise drug delivery to nanoscale medical devices. Capillary action, | medium | 3,182 |
Nano, Nanotechnology, Technology, Science, Research.
or ‘capillarity,’ will be familiar to most people as the way that water or other liquids can move up narrow tubes or other porous materials seemingly in defiance of gravity (for example within the vascular systems of plants, or even more simply, the drawing up of paint between the hairs of a | medium | 3,183 |
Nano, Nanotechnology, Technology, Science, Research.
paintbrush). This effect is due to the forces of cohesion (the tendency of a liquid’s molecules to stick together), which results in surface tension, and adhesion (their tendency to stick to the surface of other substances). The strength of the capillarity depends on the chemistry of the liquid, | medium | 3,184 |
Nano, Nanotechnology, Technology, Science, Research.
the chemistry of the porous material, and on the other forces acting on them both. For example, a liquid with lower surface tension than water would not be able to hold up a water strider insect. Less well-known is a related phenomenon, elasto-capillarity, that takes advantage of the relationship | medium | 3,185 |
Nano, Nanotechnology, Technology, Science, Research.
between capillarity and the elasticity of a very tiny flat sheet of a solid material. In certain circumstances, the capillary forces can overcome the elastic bending resistance of the sheet. This relationship can be exploited to create ‘capillary origami,’ or three-dimensional structures. When a | medium | 3,186 |
Nano, Nanotechnology, Technology, Science, Research.
liquid droplet is placed on the flat sheet, the latter can spontaneously encapsulate the former due to surface tension. Capillary origami can take on other forms including wrinkling, buckling, or self-folding into other shapes. The specific geometrical shape that the 3D capillary origami structure | medium | 3,187 |
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ends up taking is determined by both the chemistry of the flat sheet and that of the liquid, and by carefully designing the shape and size of the sheet. There is one big problem with these small devices, however. “These conventional self-assembled origami structures cannot be completely spherical | medium | 3,188 |
Nano, Nanotechnology, Technology, Science, Research.
and will always have discontinuous boundaries, or what you might call ‘edges,’ as a result of the original two-dimensional shape of the sheet,” said Kwangseok Park, a lead researcher on the project. He added, “These edges could turn out to be future defects with the potential for failure in the | medium | 3,189 |
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face of increased stress.” Non-spherical particles are also known to be more disadvantageous than spherical particles in terms of cellular uptake. Professor Hyoungsoo Kim from the Department of Mechanical Engineering explained: “This is why researchers have long been on the hunt for substances that | medium | 3,190 |
Nano, Nanotechnology, Technology, Science, Research.
could produce a fully spherical capillary origami structure.” The authors of the study have demonstrated such an origami sphere for the first time. They showed how instead of a flat sheet, the growth of salt-crystals can perform capillary origami action in a similar manner. What they call ‘crystal | medium | 3,191 |
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capillary origami’ spontaneously constructs a smooth spherical shell capsule from these same surface tension ejects, but now the spontaneous encapsulation of a liquid is determined by the elasto-capillary conditions of growing crystals. Here, the term ‘salt’ refers to a compound of one positively | medium | 3,192 |
Nano, Nanotechnology, Technology, Science, Research.
charged ion and another negatively charged. Table salt, or sodium chloride, is just one example of a salt. The researchers used four other salts: calcium propionate, sodium salicylate, calcium nitrate tetrahydrate, and sodium bicarbonate to envelop a water-oil emulsion. Normally, a salt such as | medium | 3,193 |
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sodium chloride has a cubical crystal structure, but these four salts form plate-like structures as crystallites or ‘grains’ (the microscopic shape that forms when a crystal first starts to grow) instead. These plates then self-assemble into perfect spheres. Using scanning electron microscopy and | medium | 3,194 |
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X-ray difraction analysis, they investigated the mechanism of such formation and concluded that it was ‘Laplace pressure’ that drives the crystallite plates to cover the emulsion surface. Laplace pressure describes the pressure difference between the interior and exterior of a curved surface caused | medium | 3,195 |
Nano, Nanotechnology, Technology, Science, Research.
by the surface tension at the interface between the two substances, in this case between the salt water and the oil. The researchers hope that these self-assembling nanostructures can be used for encapsulation applications in a range of sectors, from the food industry and cosmetics to drug delivery | medium | 3,196 |
Nano, Nanotechnology, Technology, Science, Research.
and even tiny medical devices. Crystal capillary origami capsule with self-assembled nanostructures The self-assembling mechanism of elasto-capillaries opens new applications in micro and nanotechnology by providing 3D…pubs.rsc.org Reaching silicon-based NEMS performances with 3D printed | medium | 3,197 |
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nanomechanical resonators by Stefano Stassi et al in Nature Communications The article “Reaching silicon-based NEMS performances with 3D printer nanomechanical resonators” published in Nature Communications shows how it is possible to obtain mechanical nanoresonators from 3D printing with figures | medium | 3,198 |
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of merit such as quality factor, published stability, mass sensitivity and strength comparable to those of silicon resonators. Micro-electro-mechanical devices (MEMS) are based on the integration of mechanical and electrical components on a micrometer scale. We all use them continuously in our | medium | 3,199 |
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everyday life: For example, in our mobile phones there are at least a dozen MEMS that regulate different activities ranging from motion, position, and inclination monitoring of the phone; active filters for the different transmission bands, and the microphone itself. Even more interesting is the | medium | 3,200 |
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extreme nanoscale miniaturization of these devices (NEMS), because it offers the possibility of creating inertial, mass and force sensors with such sensitivity that they can interact with single molecules. However, the diffusion of NEMS sensors is still limited by the high manufacturing cost of | medium | 3,201 |
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traditional silicon-based technologies. Conversely, new technologies such as 3D printing have shown that similar structures can be created at low cost and with interesting intrinsic functionalities, but to date the performance as mass sensors are poor. The research is the result of the | medium | 3,202 |
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collaboration between the Politecnico di Torino (Stefano Stassi and Carlo Ricciardi from the Department of Applied Science and Technology; and Mauro Tortello and Fabrizio Pirri from the NAMES and MPNMT groups) and the Hebrew University of Jerusalem, with the research of Ido Cooperstein and Shlomo | medium | 3,203 |
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Magdassi. Quality factors of mechanical resonators from literature as a function of the fabrication method and device mass. The quality factors of mechanical resonators at room temperature are extracted from the literature (references are reported in Supplementary Figs. S1, S2, and S3, and | medium | 3,204 |
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Supplementary Note 1) and divided regarding the fabrication method. Two of our devices with the best performances in terms of high Q factor value and low device mass for each printed resonator structure (cantilever, bridge, and membrane) are reported as star points. The trend of Q ∝ m1/3 is | medium | 3,205 |
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reported as a dashed line. The different nanodevices (membranes, cantilever, bridges) were obtained by two-photon polymerization on new liquid compositions, followed by a thermal process that removes the organic content, leaving a ceramic structure with high rigidity and low internal dissipation. | medium | 3,206 |
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The samples thus obtained are then characterized by laser Doppler vibrometry. “The NEMS that we have fabricated and characterized,” explains Stefano Stassi, “have mechanical performances in line with current silicon devices, but they are obtained through a simpler, faster and more versatile | medium | 3,207 |
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process, thanks to which it is also possible to add new chemical-physical functionalities. For example, the material used in the article is Nd: YAG, normally used as a solid-state laser source in the infrared range.” “The ability to fabricate complex and miniature devices that have performance | medium | 3,208 |
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similar to silicon ones,” says Shlomo Magdassi, “by a quick and simple 3D printing process, brings new horizons to the field of additive manufacturing and rapid manufacturing.” Reaching silicon-based NEMS performances with 3D printed nanomechanical resonators - Nature… The extreme miniaturization | medium | 3,209 |
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in NEMS resonators offers the possibility to reach an unprecedented resolution in…www.nature.com Subambient daytime radiative cooling textile based on nanoprocessed silk by Bin Zhu et al in Nature Nanotechnology A team of researchers affiliated with a host of entities in China and one in the U.S. | medium | 3,210 |
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has developed a modified textile that can keep skin cooler than materials made of cotton. In their paper published in the journal Nature Nanotechnology, the group describes their approach to developing garments that are cooler when worn in outdoor conditions. Humans have been wearing clothes for | medium | 3,211 |
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hundreds of thousands of years, and over that time, have been refining them to suit the needs of their environments, which are mostly cold environments. In this new effort, the researchers wondered if it might be possible to create a type of material that would be cooler to wear than other | medium | 3,212 |
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materials and or bare skin under direct sunlight. To find out, they started with silk fabric, a material that has been used for thousands of years because of its looks and comfort. The researchers noted that silk does a good job of reflecting sunlight in the mid-infrared range, which suggests it | medium | 3,213 |
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could be suitable as a cooling garment material. But because it is made by spiders, it contains a protein component that tends to absorb ultraviolet radiation, making the material and its wearer grow hotter under direct sunlight. To make the silk material UV reflective, the researchers dipped a | medium | 3,214 |
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standard piece of silk fabric into a liquid solution containing highly refractive inorganic oxide nanoparticles. These adhered to the silk fabric, allowing it to become evenly saturated throughout the material. They allowed the fabric to dry and then tested it to see if the addition of the | medium | 3,215 |
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nanoparticles made the material more UV reflective. They found that under peak sunlight conditions, the temperature under the material was approximately 3.5 degrees Celsius cooler than the ambient air temperature. Next, they placed the material on a patch of simulated skin and found the skin | medium | 3,216 |
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temperature was approximately 8 degrees Celsius cooler than the same type of simulated skin without the material covering. They also found that it kept the artificial skin approximately 12.5 degrees Celsius cooler than standard cotton material. Further testing showed that the material was able to | medium | 3,217 |
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reflect approximately 95% of sunlight, preventing it from passing through to the skin underneath. Subambient daytime radiative cooling textile based on nanoprocessed silk - Nature Nanotechnology Decreasing energy consumption is critical to sustainable development. Because temperature regulation for | medium | 3,218 |
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human comfort…www.nature.com Fast wide-field upconversion luminescence lifetime thermometry enabled by single-shot compressed ultrahigh-speed imaging by Xianglei Liu et al in Nature Communications A new imaging technique developed by the teams of Professors Jinyang Liang and Fiorenzo Vetrone at the | medium | 3,219 |
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Institut national de la recherche scientifique (INRS) can quickly measure temperature in 2D without contact. The results of their research were published in the journal Nature Communications. This accurate, real-time temperature detection could one day improve photothermal therapy and help in the | medium | 3,220 |
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early diagnosis of skin cancers. This technology, known as single-shot photoluminescence lifetime imaging thermometry (SPLIT), is based on the luminescence of nanoparticles doped with rare earth ions. “They are considered as nanothermometers because their luminescent properties change with the | medium | 3,221 |
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temperature of the environment. They are also biocompatible,” says Professor Vetrone, a pioneer in this field of study. Instead of imaging the luminescence point by point, which is time consuming, SPLIT uses a novel ultrahigh-speed camera to track how quickly the luminescence decays of these | medium | 3,222 |
Nano, Nanotechnology, Technology, Science, Research.
nanoparticles in every spatial point. “Our camera is different from a common one, where each click gives one image: our camera works by capturing all the images of a dynamic event into one snapshot. Then we reconstruct them, one by one,” says Xianglei Liu, a Ph.D. student at INRS and the lead | medium | 3,223 |
Nano, Nanotechnology, Technology, Science, Research.
author of this article. Schematic of the SPLIT system. The illustration shows data acquisition and image reconstruction of luminescence intensity decay in a letter “C”. L1–L5, lens. The temperature can then be sensed by checking how fast the emitted light fades out. Since it is in real time, SPLIT | medium | 3,224 |
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