Efectul structurii țesute asupra proprietății rezistente la tăiere a țesăturii Kevlar(Effect of woven structure on cut resisteant property of Kevlar fabric)

Numărul de mostre de țesături sunt fabricate indigen la Kevlar pentru a analiza proprietățile rezistente la tăiere și puncție pentru explorări comparative.Este extrem de important să ne protejăm în timp ce folosim obiecte ascuțite, cum ar fi cuțitele și diferite tipuri de tăietori în viața de zi cu zi, în special în activitățile de menaj

Effect

Cum să fii un viitor mai bun și de ce are importanță pentru îngrijirea sănătății(How to Be a Better Futurist, and Why it Matters to Health Care)

Trebuie să devii un futurist mai bun. Trebuie să vă jucați cel puțin la nivelul „prosumer”;Trebuie să devii un futurist mai bun. Trebuie să vă jucați cel puțin la nivelul „prosumer”
Întrebarea nu este dacă putem elimina defectele și putem prezice viitorul

How to Be

Grafenul face cauciucul mai elastic(Graphene makes rubber more rubbery)

În majoritatea cazurilor, ei au observat că materialul compozit rezultat poate fi întins într-o măsură mai mare și cu o forță mai mare înainte de a se rupe. Într-adevăr, adăugarea a doar o zecime dintr-un procent de grafen a fost tot ce a fost necesar pentru a face cauciucul cu 50% mai puternic.”În acest caz, am făcut un compozit de cauciuc, care este moale și elastic, dar fragil, cu grafen și materialul rezultat este atât mai puternic și mai stretchier”.

Posted: May 20, 2016

Graphene makes rubber more rubbery

(Nanowerk News) In an article published in Carbon („Graphene and water-based elastomers thin-film composites by dip-moulding”), Dr Aravind Vijayaraghavan and Dr Maria Iliut from Manchester have shown that adding a very small amount of graphene, the world’s thinnest and strongest material, to rubber films can increase both their strength and the elasticity by up to 50%. Thin rubber films are ubiquitous in daily life, used in everything from gloves to condoms.

Graphene rubber rings
Graphene rubber rings.
In their experiments, the scientists tested two kinds of rubbery materials – natural rubber, comprised of a material called polyisoprene, and a man-made rubber called polyurethane. To these, they added graphene of different kinds, amounts and size.
In most cases, it they observed that the resulting composite material could be stretched to a greater degree and with greater force before it broke. Indeed, adding just one tenth of one percent of graphene was all it took to make the rubber 50% stronger.
Dr Vijayaraghavan, who leads the Nano-functional Materials Group, explains “A composite is a material which contains two parts, a matrix which is soft and light and a filler which is strong. Taken together, you get something which is both light and strong. This is the principle behind carbon fibre composites used in sports cars, or Kevlar composites used in body armour.
“In this case, we have made a composite of rubber, which is soft and stretchy but fragile, with graphene and the resulting material is both stronger and stretchier.”
Dr Maria Iliut, a research associate in Dr Vijayaraghavan’s group, describes how this material is produced: “We use a form of graphene called graphene oxide, which unlike graphene is stable as a dispersion in water. The rubber materials are also in a form that is stable in water, allowing us to combine them before forming thin films with a process called dip moulding.”
“The important thing here is that because these films are so thin, we need a strengthening filler which is also very thin. Fortunately, graphene is both the thinnest and strongest material we know of.”
The project emerged from a call by the Bill & Melinda Gates Foundation, to develop a more desirable condom. According to Dr Vijayaraghavan, this composite material has tremendous implications in daily life.
He adds “Our thinking was that if we could make the rubber used in condoms stronger and stretchier, then you could use that to make even thinner condoms which would feel better without breaking.
“Similar arguments can be made for using this material to make better gloves, sportswear, medical devices and so on. We are seeing considerable industrial interest in this area and we hope more companies will want to get involved in the commercial opportunities this research could create.”
Source: The University of Manchester

Cercetătorii mențin rețelele în mișcare pentru a fi siguri de atacurile hackerilor(Researchers keep networks moving to stay safe from hacker attacks)

Cercetătorii de la Mason care lucrează la următorul pas în lupta împotriva hackerilor de pe computer. Este o metodă numită „shuffling”, în care hackerii și utilizatorii obișnuiți sunt rapid separați printr-o serie de împărțiri care în cele din urmă izolează actorii răi

Researchers

Departamentul de Științe al Apărării anunță Ziua ofertanților la nivel de birou(Defence Sciences Office Announces Office -wide Proposers Day)

Misiunea DSO este de a identifica și de a continua inițiativele de cercetare în materie de riscuri, de mare salarizare într-un spectru larg de discipline științifice și de inginerie și de a transforma aceste inițiative într-o nouă tehnologie radicală de schimbare a jocului pentru securitatea națională a SUA

Defense

Protejarea impotriva contaminantilor de virsta(Protecting Against Doomsday Contaminants)

Sunt create noi instrumente pentru cele mai grave scenarii de apă potabilă: contaminare chimică, biologică, radiologică și nucleară (CBRN);materialul se poate răspândi în apă rapid și cu precădere înainte de detectarea problemei;Setul de senzori CBRN disponibili, care pot fi utilizați pentru detectarea amenințărilor de contaminare a calității apei potabile în sistemul de distribuție, este foarte limitat

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Vertex Speed ​​Sleeve Carry (cu maneci lungi, Forest Plaid) și Delta Stretch Lo-Pro / Lo-Vis Pantaloni de luptă / tactici pentru operațiuni speciale de acoperire și Carrierul ascuns civilian (CCW)(Vertex Speed Concealed Carry Shirt (Long Sleeve,Forest Plaid) and Delta Stretch Lo-Pro/Lo-Vis Combat/Tactical Pants for Covert Special Operations and Civiliana Concealed Carry(CCW))

Pantaloni de luptă / tactici pentru operațiuni speciale de acoperire

Vertex

Nanowire ferestre reglabile pentru intimitate, camuflaj(Tunable nanowire windows for privacy, camouflage)

au dezvoltat o tehnică care poate schimba rapid opacitatea unei ferestre, transformându-o în ceață, clară sau undeva între ele, cu mișcarea unui comutator.

Posted: Mar 14, 2016

Tunable nanowire windows for privacy, camouflage

(Nanowerk News) Say goodbye to blinds.

Researchers at the Harvard John A. Paulson School of Engineering and Applied Sciences have developed a technique that can quickly change the opacity of a window, turning it cloudy, clear or somewhere in between with the flick of a switch.
Tunable windows aren’t new but most previous technologies have relied on electrochemical reactions achieved through expensive manufacturing. This technology, developed by David Clarke, the Extended Tarr Family Professor of Materials, and postdoctoral fellow Samuel Shian, uses geometry adjust the transparency of a window.
The research is described in journal Optics Letters („Electrically tunable window device”).
tunable windows
The tunable window is comprised of a sheet of glass or plastic, sandwiched between transparent, soft elastomers sprayed with a coating of silver nanowires, too small to scatter light on their own.
But apply an electric voltage and things change quickly.
With an applied voltage, the nanowires on either side of the glass are energized to move toward each other, squeezing and deforming the soft elastomer. Because the nanowires are distributed unevenly across the surface, the elastomer deforms unevenly. The resulting roughness causes light to scatter, turning the glass opaque.
The change happens in less than a second.
It’s like a frozen pond, said Shian.
„If the frozen pond is smooth, you can see through the ice. But if the ice is heavily scratched, you can’t see through,” said Shian.
Clarke and Shian found that the roughness of the elastomer surface depended on the voltage, so if you wanted a window that is only lightly clouded, you would apply less voltage than if you wanted a totally opaque window.
„Because this is a physical phenomenon rather than based on a chemical reaction, it is a simpler and potentially cheaper way to achieve commercial tunable windows,” said Clarke.
Current chemical-based controllable windows use vacuum deposition to coat the glass, a process that deposits layers of a material molecule by molecule. It’s expensive and painstaking. In Clarke and Shian’s method, the nanowire layer can be sprayed or peeled onto the elastomer, making the technology scalable for larger architectural projects.
Next the team is working on incorporating thinner elastomers, which would require lower voltages, more suited for standard electrical supplies.
Harvard’s Office of Technology Development has filed a patent application on the technology and is engaging with potential licensees in the glass manufacturing industry.
Source: Harvard John A. Paulson School of Engineering and Applied Sciences