Materiale si echipamente cu proprietati in mascarea in domeniul vizibil ,IR , al undelor radar sau care pot avea proprietati in mimetism – Pagina 5

Instrumente de acțiune directă (DAG) Dragon Egg and Dust Heavy-Duty Combatere / Tactică Hidratare pachete (Backpack) Sisteme în Hyde Definiție PenCott modele de camuflaj de luptă digitală pentru Forțele de Operații Speciale Militare (SOF) și Shooters Civil Tactical(Direct Action Gear (DAG) Dragon Egg and Dust Heavy-Duty Combat/Tactical Hydration Pack(Backpack) Systems in Hyde Definition PenCott Digital Combat Camouflage Patterns for Military Special Operations Forces(SOF) and Civilian Tactical Shooters)

arid model de camuflaj digital de lupta pentru ultimele 6-8 luni, dar de fapt a devenit pachetul nostru de zi preferat imediat

DAG

Secvența dvs. genetică vă poate menține caldă în această iarnă(Your genetic sequence could keep you warm this winter)

Atunci când Dot One se potrivește cu acest cod al culorilor, rezultatul este un model de eșarfă care arată în mod rezonabil la modă, dar este aproape sigur că este unic – dacă nu sunteți un gemist identic, șansele de a alerga în altcineva cu aceeași eșarfă sunt practic zero

Your

Inginerii dezvoltă o piele flexibilă care captează undele radar, obiecte de mantale(Engineers develop flexible skin that traps radar waves, cloaks objects

au dezvoltat o nouă meta-piele flexibilă, extensibilă și adaptabilă, care utilizează rânduri de dispozitive mici, lichide și metalice pentru a acoperi un obiect din ochii ascuțiți ai radarului.
Meta-pielea ia numele din metamateriale, care sunt compozite care au proprietăți care nu sunt găsite în natură și care pot manipula undele electromagnetice. Prin întinderea și flexarea meta-pielei polimerului, aceasta poate fi reglată pentru a reduce reflexia unei game largi de frecvențe radar.

Posted: Mar 07, 2016
Engineers develop flexible skin that traps radar waves, cloaks objects (Nanowerk News) Iowa State University engineers have developed a new flexible, stretchable and tunable „meta-skin” that uses rows of small, liquid-metal devices to cloak an object from the sharp eyes of radar.
The meta-skin takes its name from metamaterials, which are composites that have properties not found in nature and that can manipulate electromagnetic waves. By stretching and flexing the polymer meta-skin, it can be tuned to reduce the reflection of a wide range of radar frequencies.
The journal Scientific Reports recently reported the discovery online („From Flexible and Stretchable Meta-Atom to Metamaterial: A Wearable Microwave Meta-Skin with Tunable Frequency Selective and Cloaking Effects”). Lead authors from Iowa State’s department of electrical and computer engineering are Liang Dong, associate professor; and Jiming Song, professor. Co-authors are Iowa State graduate students Siming Yang, Peng Liu and Qiugu Wang; and former Iowa State undergraduate Mingda Yang. The National Science Foundation and the China Scholarship Council have partially supported the project.

This flexible, stretchable and tunable „meta-skin” can trap radar waves and cloak objects from detection. (Image: Liang Dong/Iowa State University)
„It is believed that the present meta-skin technology will find many applications in electromagnetic frequency tuning, shielding and scattering suppression,” the engineers wrote in their paper.
Dong has a background in fabricating micro and nanoscale devices and working with liquids and polymers; Song has expertise in looking for new applications of electromagnetic waves.
Working together, they were hoping to prove an idea: that electromagnetic waves – perhaps even the shorter wavelengths of visible light – can be suppressed with flexible, tunable liquid-metal technologies.
What they came up with are rows of split ring resonators embedded inside layers of silicone sheets. The electric resonators are filled with galinstan, a metal alloy that’s liquid at room temperature and less toxic than other liquid metals such as mercury.
Those resonators are small rings with an outer radius of 2.5 millimeters and a thickness of half a millimeter. They have a 1 millimeter gap, essentially creating a small, curved segment of liquid wire.
The rings create electric inductors and the gaps create electric capacitors. Together they create a resonator that can trap and suppress radar waves at a certain frequency. Stretching the meta-skin changes the size of the liquid metal rings inside and changes the frequency the devices suppress.
Tests showed radar suppression was about 75 percent in the frequency range of 8 to 10 gigahertz, according to the paper. When objects are wrapped in the meta-skin, the radar waves are suppressed in all incident directions and observation angles.
„Therefore, this meta-skin technology is different from traditional stealth technologies that often only reduce the backscattering, i.e., the power reflected back to a probing radar,” the engineers wrote in their paper.
As he discussed the technology, Song took a tablet computer and called up a picture of the B-2 stealth bomber. One day, he said, the meta-skin could coat the surface of the next generation of stealth aircraft.
But the researchers are hoping for even more – a cloak of invisibility.
„The long-term goal is to shrink the size of these devices,” Dong said. „Then hopefully we can do this with higher-frequency electromagnetic waves such as visible or infrared light. While that would require advanced nanomanufacturing technologies and appropriate structural modifications, we think this study proves the concept of frequency tuning and broadening, and multidirectional wave suppression with skin-type metamaterials.”

Source: Iowa State University

O cameră 3D mai bună cu detectori luminoși de lumină grafenică(A better 3D camera with clear, graphene light detectors)

Imaginile și videoclipurile recodate de camerele 3D ar putea fi proiectate într-o bună zi ca holograme – deși protecția este o provocare totală diferită

sti

Interferența la o fantă dublă formată din doi atomi

Emițătoare cu un singur foton utilizând atomi unici stocați în rezonatoare optice ș schimbul de informații cuantice într-o rețea cuantică de lungă distanță.

Posted: Feb 29, 2016
Interference at a double slit made of two atoms (Nanowerk News) The investigation and exploitation of light-matter-interaction in optical resonators is one of the central research topics in the Quantum Dynamics Division of Professor Gerhard Rempe, Director at the Max Planck Institute of Quantum Optics in Garching. A couple of years ago, the team succeeded in creating single-photon emitters using single atoms stored in optical resonators. The stationary atoms can, for example, serve as nodes for the exchange of quantum information in a long-distance quantum network.
Now, the scientists went one step further. They trapped a pair of atoms with well-defined relative positions in such a resonator and scattered light from this “double slit”. They observed interference phenomena that contradict well-established intuition. These results were enabled by the development of a technique that allows for position control of the atoms with an accuracy well below the wavelength of the scattered light. One motivation for this experiment is to better understand fundamental aspects of cavity quantum electrodynamics.
Furthermore, the technique paves the way for studying new concepts of entanglement generation between quantum bits and thus opens up new perspectives for quantum information processing (Nature Photonics, „Interference and dynamics of light from a distance-controlled atom pair in an optical cavity”).

Resonant laser light (red arrow) is being scattered from two single atoms. The effects that arise due to interference (here shown in an artist’s view) are determined by the relative spatial phase of the atoms and the interaction with the light mode of the optical resonator (mirrors in grey). Lower left: fluorescence image of two rubidium atoms. (Graphic: Andreas Neuzner, MPQ)
Key element of the experimental set-up is an optical resonator consisting of two highly-reflecting mirrors spaced by 0.5 mm. Inside the cavity, a so-called optical lattice is generated by crossing two retro-reflected laser beams, one oriented orthogonal to and the other along the resonator axis. The resulting light pattern of bright and dark spots resembles a checker board with a period of about half a micrometre. These spots define lattice sites at which the atoms can be trapped and where they are localized to about 25 nanometres.
At first, a couple of rubidium atoms, precooled to very low temperatures, are loaded into the optical lattice. By detecting their fluorescence light via a high-resolution microscope objective, the atoms can be identified as individual light spots. Excess atoms are subsequently removed by individually heating them up with a resonant laser beam, until only a pair of atoms with the desired spacing remains. “This is the “double-slit” from which the resonant laser light, propagating transversally through the resonator, is scattered”, explains Andreas Neuzner, who performed this experiment as part of his doctoral studies.
„Interference can only be observed if the phase relation between the two light sources is fixed“, explains Dr. Stephan Ritter, another scientist on the experiment. “In order to investigate the interference as a function of the phase, we have to know the position of the atoms with a precision well below the wavelength of 780 nanometres.“ Although the resolution of the imaging system limits the size of the atom images to 1.3 micrometres, the scientists can localize the emitting atoms with an accuracy of 70 nanometres and can thereby assign their position to a particular lattice site. Therefore, the distance between two atoms, typically about 10 micrometres, is precisely known.
The resonator favours emission along its axis and enhances the interaction between the atoms and the scattered light, which is reflected multiple times between the mirrors. The light power leaking through one of the mirrors – i.e. the photon rate – is recorded as a function of the relative phase of the two atoms.
The observed interference pattern displays several intriguing features that are not expected in the simpler picture of two classical dipoles in free space. First, in the case of in-phase (constructive) interference, the intensity is only a factor of 1.3 larger than the rate observed for a single atom, whereas a fourfold larger signal is expected for the simpler picture. This phenomenon goes back to the various light fields inside the resonator that have to be taken into account. In contrast to the classical double-slit experiment, not only the phase relation between the scattered light waves matters. It is rather the superposition of the scattered light with the light field of the resonator that in the end leads to an intensity reduction in the field maxima.
The second feature occurs for out-of-phase (destructive) interference. Here, the photon rate drops below the value measured for a single atom, but does not go to zero as one would expect intuitively. Strikingly, extremely strong intensity fluctuations are observed, so-called photon bunching. “This phenomenon arises, because in the case of destructive interference, the atoms can emit photons only pairwise and at the same time into the resonator”, explains Andreas Neuzner.
„In this experiment we have combined three key techniques for the first time: Using an optical lattice, we position the atoms with high accuracy and then localize them with a high-resolution microscope. The interaction with the resonator enables directed detection of the scattered light“, says Stephan Ritter. “The newly developed techniques are essential for future experiments aiming to explore collective radiation effects predicted for multi-atom systems“, resumes Prof. Gerhard Rempe. “On the other hand, they offer the possibility to implement novel protocols for quantum information processing with several quantum bits.”

Source: Max Planck Institute of Quantum Optics

Un nou răsucire pe tehnologia veche ar putea aduce culoarea vie la putere redusă (New twist on old tech could bring living color at low power

Polimerii electrochromici constituie o clasă specială de materiale care pot trece de la culori la culori și înapoi, când se modifică sarcina electrică. Adoptarea largă a acestora a fost totuși împiedicată deoarece această transformare depinde de cât de repede electronii pot intra și ieși din material, ceea ce poate dura câteva secunde, în funcție de grosimea filmului. De ce nu faceti filmele mai subtiri, astfel incat sa schimbe culoarea mai repede? Idee bună, dar, din păcate, reducerea grosimii peliculei răstoarnă culorile contrastului lor, oferindu-vă o nuanță semitransparentă negru atunci când ceea ce ați dorit a fost un negru impenetrabil, opac.
Un afișaj bazat pe această schemă ar avea o serie de nanograme care acționează ca pixeli cu o singură culoare, ale căror culori, adăugând sau scăzând, ar produce toate culorile curcubeului, pixelii individuali având niveluri reglabile de luminozitate sau contrast.

Posted: Feb 04, 2016
New twist on old tech could bring living color at low power (Nanowerk News) By marrying state-of-the-art nanometer-scale gratings with a Space Age-era thin-film polymer, researchers working at the National Institute of Standards and Technology (NIST) have developed a new technology for building power-sipping full-color video displays, switches and routers for optical signals, as well as smart windows and coatings (Nature Communications, „High-contrast and fast electrochromic switching enabled by plasmonics”).

In this schematic, light enters from above and encounters a nanometer-scale grating made of aluminum and coated with a special ‘electrochromic’ material. Light passes through the nanograting as surface plasmons, oscillations that travel at the interface of a metal and a dielectric (insulating) material. The spacing of the slits serves to filter out all but one color of light, and an additional layer of silicon nitride further spectrally purifies the escaping light. (Image: T. Xu and A. Agrawal/NIST) (click on image to enlarge)
Electrochromic polymers make up a special class of materials that can switch from clear to colored and back again when their electrical charge changes. Their wide adoption, however, has been hindered because this transformation depends on how quickly electrons can get into and out of the material, which can take several seconds depending on the thickness of the film. Why not just make the films thinner so they’ll change color faster? Good idea, but unfortunately, reducing the film’s thickness robs the colors of their contrast, giving you a semitransparent black tint when what you wanted was an impenetrable, opaque black.
If the choice between being slow or weakly colored weren’t bad enough, an electrochromic display using an additive color scheme—in which red, green and blue are mixed to achieve full color—would need up to six transparent electrically conducting layers to work, adding substantially to the cost of manufacturing.
Using some clever engineering, the researchers overcame this impasse by layering a thin film of electrochromic polymer over an aluminum nanograting. In their setup, the light first encounters the nanograting which, depending on the spacing of the slits, filters out all but one color of light. The electrochromic coating serves to modulate that light by allowing all or some (or none) of it to pass. A display based on this scheme would have an array of nanogratings acting as single-color pixels whose colors would, by adding or subtracting them, produce all the colors of the rainbow, with the individual pixels having adjustable levels of brightness or contrast.
But how does combining a thin film of electrochromic polymer with a nanograting make up for the just-described deficiencies of using said thin film? According to co-lead author Amit Agrawal, it’s all about the architecture.
“Because the electrochromic film that coats the sidewalls of the nanograting is so thin, it’s very easy for electrons to make their way through and change its opacity,” Agrawal says. “The slits are much narrower (about 60 nanometers) than the wavelengths of light they are transmitting (from about 400 to 700 nanometers). This forces the incoming light to cling to the interface between the metal and the electrochromic layer on its way down the slits. And because the grating is so much deeper (about 250 nanometers) than it is wide, and the walls of the slits are coated with electrochromic polymer all the way down, it can reduce the light’s intensity to the same degree as if the light were passing through a much thicker layer of electrochromic film, enabling a great amount of control.”
NIST Fellow Henri Lezec, an author of the paper, says the setup they have now uses a liquid electrolyte, a chemical that facilitates the proper flow of electrons, which is not ideal for manufacturability and reliability, but that it could easily be replaced with a more physically stable and compact solid-state electrolyte.
Alec Talin, a co-author based at Sandia National Laboratories, says that the next step in extending this principle would be toward reflective, sunlight-readable displays that do not require an energy-consuming backlight.

Source: The National Institute of Standards and Technology

REVISTA CĂLDURILOR ȘI TRANSPORTELE SONICE: ARMATA GHOSTĂ A RĂZBOIULUI MONDIAL II(RUBBER TANKS AND SONIC TRUCKS:THE GHOST ARMY OF WORLD WAR II)

Ei au conceput modalități de ascundere a echipamentelor în mediul natural;cele mai importante elemente de recuzită erau încă proiectate
armata a încercat mai multe tipuri diferite, în cele din urmă alegând un design gonflabil creat de Fred Patton din SUA

41 sept

Chinezii dezvoltă un nou model ultra-subțire, ușoare „tunibili” UHF cu radar absorbant pentru materiale stealth Materiale pentru tehnica mascării pentru avioane și nave de luptă cu echipaj și fără pilot(Chinese Develop New ‘Ultra-Thin’, Lightweight ‘Tunable’ UHF Microwave Radar-Absorbing Stealth Material Cloaking Technology for Manned and Unmanned Combat Aircraft and Warships)

Ca și cum nu am avea deja suficient să ne facem griji cu chinezii, în ultima vreme. Apărător Unul tocmai a publicat o piesă pe un nou „descoperire materială stealth” chineză, care are potențialul de a crea unele probleme reale de urmărire a radarului, dacă le pot aplica efectiv la aeronavele lor. Noul material absorbant de radar poate aparent „să învingă radarul cu microunde la frecvențe ultra-ultra-frecvente sau UHF”, ceea ce trebuia să ne permită aliaților noștri, inclusiv israelienilor, să monitorizeze în mod intenționat aeronavele inamice mici.

Chinese Develop New ‘Ultra-Thin’, Lightweight ‘Tunable’ UHF Microwave Radar-Absorbing Stealth Material Cloaking Technology for Manned and Unmanned Combat Aircraft and Warships

Posted by: David Crane November 11, 2015

As if we didn’t already have enough to worry about with the Chinese, lately. Defense One just published a piece on a new Chinese “stealth material breakthrough” that has the potential to create some real radar tracking problems if they can effectively apply it to their aircraft. The new radar-absorbant material can apparently “defeat microwave radar at ultrahigh frequencies, or UHF”, which was supposed to allow us AND our allies, including the Israelis to track enemy low-obserbable aircraft at will.

“Our proposed absorber is almost ten times thinner than conventional ones,” said Wenhua Xu, a member of the Huazhong University of Science and Technology in China. The following is the key technical portion of the Defense One piece:

In their paper, published today in the “Journal of Applied Physics”, the team describes a material composed of semi-conducting diodes (varactors) and capacitors that have been soldered onto a printed circuit board. That layer is sitting under a layer of copper resistors and capacitors just .04 mm thick, which they called an “active frequency selective surface material” or AFSS. The AFSS layer can effectively be stretched to provide a lot of absorption but is thin enough to go onto an aircraft. The next layer is a thin metal honeycomb and final is a metal slab.

In other words, the new material is “ultra-thin” and lightweight enough to be practically applied to fighter jet aircraft, UAS/UAV/drone aircraft, ships, you name it. Here’s the technical portion in the AIP piece on the tech that DR found interesting:

To solve this problem, a team of researchers from Huazhong University of Science and Technology in China has developed an ultra-thin, tunable broadband microwave absorber for ultra-high frequency applications. This ultra-thin absorbing surface, called an active frequency-selective surface absorber, consists of arrays of patterned conductors loaded with two common types of circuit elements known as resistors and varactors. The unit patterned cell absorbs microwaves and can also be actively controlled by stretching to expand the tunable bandwidth.

Quotes from the AIP piece: “Our proposed absorber was fabricated with a stretching transformation pattern, which is both thin and can absorb a wide range of frequencies for near-meter microwave application,” said Wenhua Xu, the primary researcher in the team led by Jianjun Jiang, a professor of School of Optical and Electronic Information at the Huazhong University of Science and Technology, China. “Its absorption range covers a broad band from 0.7 to 1.9 gigahertz below -10 decibel, and the total thickness of the absorber is only 7.8 millimeters, which is one of the thinnest microwave absorbers reported.”

Here’s the link to the full AIP piece on the new radar-absorbant material tech, written by Zhengzheng Zhang (what a name!):

Ultra-thin, tunable, broadband microwave absorber may advance radar cloaking

Defense Review’s questions are these: Why would the Chinese government/military want to let the cat out of the bag about the new tech if it actually works? To intimidate the United States? Does the value of flexing their technological muscle outway the strategic advantages of keeping the new technology secret, at least for awhile? Did they release the information because they knew that the United States government had somehow found out about it, and already knew how it worked? Finally, is the technology actually real, or an elaborate disinformation exercise/hoax?

Time, and more investigation, will tell. However, if it’s real, it’s could prove to be a MAJOR problem for us if/when World War III (WWIII) happens, and we have to face the Chinese, or worse, the Chinese AND the Russians, in nation-state warfare, which hopefully won’t go nuclear, God forbid.

Organization/Company Contact Info:

Jason Socrates Bardi
AIP Publishing
Phone: 240-535-4954
Email: [email protected]
Twitter: @jasonbardi
Website: https://www.aip.org

Huazhong University of Science & Technology
1037 Luoyu Road
Hongshan, Wuhan, Hubei, China
Phone: +86 27 8754 1114
Website: http://english.hust.edu.cn

Receptorul ultra-subțire, tunabil, cu bandă largă în microunde, poate avansa în masca radar(Ultra-thin, tunable, broadband microwave absorber may advance radar cloaking)

sunt un fel de material care poate absorbi energia incidentă a microundelor pentru a face obiectele invizibile la radar

stimp22

53/5000 Graphene „hârtie” capabil să se comporte ca origami animat(Graphene ‘paper’ able to behave like animated origami)

sau chiar dezvoltarea unui tip de mușchi artificial;O cutie rapidă de auto-pliere condusă de profilele luminoase. Profilurile de timp de mișcare autoploțată a unei bucăți de hârtie în formă de cruce cu sau fără iradiere cu lumină NIR.
Imagini IR ale cutiei cu pliere automată cu și fără iluminare ușoară

stimp13

Spinel Armura din aluminiu transparent (armura corp / facială și armura vehiculului) și optică pentru soldații viitorului / luptătorii!(Spinel Transparent Aluminum Armor( Body/Facial Armor and Vehicle Armor) and Optical for Future Soldiers/Warfighters!)

dezvoltarea tehnologiei transparente din aluminiu din ceramică din aluminiu, numită „spinel”, care poate fi utilizată pentru a crea totul, de la vehiculul transparent și armura corpului până la sticla optică ușoară, superioară și ecranele smartphone-uri rezistente la șocuri

stimp24

Engineers develop flexible skin that traps radar waves, cloaks objects

Interference at a double slit made of two atoms

New twist on old tech could bring living color at low power

Chinese Develop New ‘Ultra-Thin’, Lightweight ‘Tunable’ UHF Microwave Radar-Absorbing Stealth Material Cloaking Technology for Manned and Unmanned Combat Aircraft and Warships