O echipă de ingineri a dezvoltat celule de combustibil elastice care extrag energia din transpirație și sunt capabile să alimenteze electronică, cum ar fi LED-urile și radiourile Bluetooth
TSD numai cu psihoterapie, deoarece adesea trauma subiectivă este prea dificilă pentru ca oamenii să se retragă din nou cu un terapeut
Pe baza rezultatelor preliminare, Zhang dorește să exploreze modalități de a crea un set integrat de senzori auto-susținători care să fie alimentați de nano-generatori. Ea sugerează, de asemenea, că senzorii de mătase ai echipei sale ar putea fi folosiți pentru a construi roboți mai reali care să poată simți atingerea, temperatura sau umiditatea și pot chiar distinge între vocile diferitelor persoane.
| Posted: Aug 21, 2017 | |
Silk could improve sensitivity, flexibility of wearable body sensors(Nanowerk News) From smart socks to workout clothes that measure exertion, wearable body sensors are becoming the latest „must-have” technology. Now scientists report they are on the cusp of using silk, one of the world’s most coveted fabrics, to develop a more sensitive and flexible generation of these multi-purpose devices that monitor a slew of body functions in real time. |
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| The researchers are presenting their work today at the 254th National Meeting & Exposition of the American Chemical Society (ACS). | |
| „There is a whole world of possibilities for silk sensors at the moment. Silk is the ideal material for fabricating sensors that are worn on the body,” Yingying Zhang, Ph.D., says. „One possibility we foresee is for them to be used as an integrated wireless system that would allow doctors to more easily monitor patients remotely so that they can respond to their medical needs more rapidly than ever before.” | |
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| Silk could soon be used to produce more sensitive and flexible body sensors like this one. (Image: Yingying Zhang) | |
| Body sensors, which are usually made with semiconductors, have shown great potential for monitoring human health. But they have limitations. For instance, strain sensors, which measure changes in force, cannot be highly sensitive and highly stretchable at the same time. Silk, a natural material that is stronger than steel and more flexible than nylon, could overcome these problems. The fiber is also lightweight and biocompatible. However, silk doesn’t conduct electricity very well. To address this challenge, Zhang and colleagues at Tsinghua University in China sought to find a way to boost the conductivity of silk so it could be successfully used in body-sensing devices. | |
| The researchers decided to try two different strategies. In one approach, they treated the silk in an inert gas environment with temperatures ranging from 1,112 degrees to 5,432 degrees Fahrenheit. As a result, the silk became infused with N-doped carbon with some graphitized particles, which is electrically conductive. Using this technique, the scientists have developed strain sensors, pressure sensors and a dual-mode sensor capable of measuring temperature and pressure simultaneously. | |
| In the other approach, the team fed either graphene or carbon nanotubes to silkworms. Some of these nanoparticles were naturally incorporated into the silk produced by the worms. So far, this method hasn’t produced electrically conductive fibers, but the researchers are still experimenting with this technique and are hopeful they can make it work. | |
| Based on the preliminary results, Zhang wants to explore ways to create an integrated set of silk-based, self-sustaining sensors that would be powered by nano-generators. She also suggests that her team’s silk sensors might be used to build more realistic robots that can sense touch, temperature or humidity and can even distinguish between different people’s voices. |
| Source: American Chemical Society |
Read more: Silk could improve sensitivity, flexibility of wearable body sensors
Tehnologia performanta este angajato serios pentru a ajuta la îmbunătățirea capacităților sale de infanterie; Dezvoltatorii din spatele adoptării aplicațiilor de tehnologie de uzură sunt variate, însă o aplicație cheie este folosirea acestei tehnologii pentru a monitoriza starea fizică a unui soldat
Scopul nostru este un sistem de demonstrații tehnologice care se va potrivi vehiculelor terestre tactice și navelor maritime
O echipă de oameni de știință și ingineri, membrii Laboratorului de Cercetare a Forțelor Aeriene al SUA, a elaborat un material flexibil pentru pompieri
a fost în curs de dezvoltare echipamente de material flexibil pentru războinici;Exploatând avantajele tehnologiei aditivilor, nanomaterialelor și platformelor de cercetare autonome, în timp ce valorifică parteneriatele cu industria și mediul academic, echipa conduce un portofoliu dedicat cercetării materialelor destinate viitorului, dedicat asigurării faptului că Forțele Aeriene dispun de cea mai avansată tehnologie pentru lupta
În timp ce diferite materiale ceramice posedă o duritate ridicată, acestea nu reușesc cu ușurință atunci când sunt separate;când este supus forțelor de tracțiune;cantitatea de tensiune pe care aceste materiale le poate rezista înainte de eșec, este o mică parte din compresia pe care o pot suporta
Modelul îmbunătățit sa dovedit a prezice mai bine rezistența unei game largi de ținte ceramice atunci când a fost împușcată de un proiectil cu tijă lungă la viteze de până la 3 km / s. Parametrii importanți ai performanței de penetrare a unei ținte ceramice au fost identificați prin acest efort de colaborare, care va ghida modul în care procesele de defecțiuni din ceramică pot fi controlate printr-o proiectare îmbunătățită a materialelor sau printr-o abordare a sistemelor multimateriale
| Posted: Aug 18, 2017 | |
Light-weight ceramic materials a model for lighter armor(Nanowerk News) „While various ceramic materials possess high hardness, they fail easily when pulled apart. That is, when subjected to tensile forces. The amount of tension that these materials can withstand before failure, is a small fraction of the compression they can withstand. As a result, high velocity impact of bullets and fragments causes extensive cracking and fragmentation of the material, reducing its ability to fully utilize its superior hardness to resist complex stress states generated by the impact event,” explained Dr. Sikhanda Satapathy, of ARL’s Soldier Protection Sciences Branch. |
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| This is a side image of a laboratory projectile impacting a ceramic disk backed by polycarbonate captured using high speed cameras. (Image: US Army Research Laboratory) | |
| Traditionally, the relationship between the granular material’s ability to withstand compression and its ability to resist shearing deformation, which causes material to change shape has been described by the Mohr-Coulomb model. This model approximates the material’s resistance to shearing deformation (shear strength) as a linear function of applied pressure. In reality, the shear strength does not increase linearly with pressure and will saturate at high pressures. | |
| The University of Florida (UF) researchers developed a new model that describes the granular material response more accurately by studying the stress state at which a variety of ceramics fail as reported in the literature by various research teams (International Journal of Solids and Structures, „An improved dynamic expanding cavity model for high-pressure and high-strain rate response of ceramics”). | |
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| This is a simulation of a laboratory projectile impacting ceramic backed by polycarbonate showing damage in the ceramic. (Image: US Army Research Laboratory) | |
| The ARL and the UF team collaborated to employ this improved granular response model in conjunction with a dynamic cavity expansion modeling framework to capture the response of ceramics to the complex impact-induced stress state that includes compression, tension and shear. The dynamic cavity expansion modeling framework uses the pressure required to expand a cavity in an intact material to characterize its ability to resist deep penetration. This pressure, of course, is dependent on how the material responds to compression, tension and shear forces. | |
| Due to the applicability of this new model to a broad class of ceramics, the need for expensive experiments to characterize penetration response is significantly reduced. The new penetration model improves the understanding of how brittle ceramic responds to high impact stress by fracturing and comminuting to granular like material, and increases modeling ability of penetration events. | |
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| This is the rear surface of the ceramic disk viewed through the polycarbonate backer showing the failure of a ceramic disk as a result of impact by a laboratory projectile. (Image: US Army Research Laboratory) | |
| The improved model has been shown to better predict the resistance of a wide range of ceramic targets when shot at by a long-rod projectiles at velocities up to 3km/s. The important material parameters for penetration performance of a ceramic target have been identified through this collaborative effort, which will guide how the failure processes in ceramic can be controlled through improved material design or through a multi-materials systems approach. | |
| „Understanding the mechanics of material response to projectile impact generated stress conditions is crucial in this research,” Satapathy said. |
| Source: U.S. Army Research Laboratory |
Read more: Light-weight ceramic materials a model for lighter armor
TSA a lansat recent un videoclip care pretinde că oferă o privire interioară asupra tacticii de securitate a aeroportului – modul în care agenția protejează călătorii – de regulă, agențiile guvernamentale din domeniu sunt timide să discute
textile inteligente, cu capacitatea de a detecta rapid și de a neutraliza gazul nervos
