#Metamaterials
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A new optical metamaterial makes true one-way glass possible
A new approach has allowed researchers at Aalto University to design a kind of metamaterial that has so far been beyond the reach of existing technologies. Unlike natural materials, metamaterials and metasurfaces can be tailored to have specific electromagnetic properties, which means scientists can create materials with features desirable for industrial applications.
The new metamaterial takes advantage of the nonreciprocal magnetoelectric (NME) effect. The NME effect implies a link between specific properties of the material (its magnetization and polarization) and the different field components of light or other electromagnetic waves. The NME effect is negligible in natural materials, but scientists have been trying to enhance it using metamaterials and metasurfaces because of the technological potential this would unlock.
The work is published in the journal Nature Communications.
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Pretty awesome
"The sensor works purely mechanically and doesn't require an external energy source. It simply utilises the vibrational energy contained in sound waves," Robertsson says.
Whenever a certain word is spoken or a particular tone or noise is generated, the sound waves emitted -- and only these -- cause the sensor to vibrate. This energy is then sufficient to generate a tiny electrical pulse that switches on an electronic device that has been switched off.
The prototype that the researchers developed in Robertsson's lab at the Switzerland Innovation Park Zurich in Dübendorf has already been patented. It can distinguish between the spoken words "three" and "four." Because the word "four" has more sound energy that resonates with the sensor compared to the word "three," it causes the sensor to vibrate, whereas "three" does not. That means the word "four" could switch on a device or trigger further processes. Nothing would happen with "three."
Newer variants of the sensor should be able to distinguish between up to twelve different words, such as standard machine commands like "on," "off," "up" and "down." Compared to the palm-sized prototype, the new versions are also much smaller -- about the size of a thumbnail -- and the researchers are aiming to miniaturise them further.
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Developing a lightweight material that is both strong and highly ductile has been regarded as a long-desired goal in the field of structural materials, but these properties are generally mutually exclusive. Researchers at City University of Hong Kong (CityU) recently discovered a low-cost, direct method to turn commonly used 3D printable polymers into lightweight, ultra-tough, biocompatible hybrid carbon microlattices, which can be in any shape or size, and are 100 times stronger than the original polymers.
https://www.nanotechnologyworld.org/post/convert-3d-printed-polymer-into-a-100-times-stronger-ductile-hybrid-carbon-microlattice-material
#nanotechnology#materialsscience#advanced materials#materialsengineering#3dprinting#carbon#metamaterials#engineering#aeronautical and aerospace industry#biotechnology
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John Michael Godier (Event Horizon)
Dr. Garry Nolan (December 2022)
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Saturday, December 3, 2022
#ufo#uap#talk#Youtube#biogenesis#genetics#ai#analytics#injuries#metamaterials#scientific approach#bioengineering
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Not Science Fiction: Harvard Scientists Have Developed an “Intelligent” Liquid
By Harvard John A. Paulson School of Engineering and Applied Sciences April 7, 2024
Harvard researchers have created a versatile programmable metafluid that can change its properties, including viscosity and optical transparency, in response to pressure. This new class of fluid has potential applications in robotics, optical devices, and energy dissipation, showcasing a significant breakthrough…
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An endless domino effect - Technology Org
New Post has been published on https://thedigitalinsider.com/an-endless-domino-effect-technology-org/
An endless domino effect - Technology Org
If it walks like a particle, and talks like a particle… it may still not be a particle. A topological soliton is a special type of wave or dislocation which behaves like a particle: it can move around but cannot spread out and disappear like you would expect from, say, a ripple on the surface of a pond. In a new study published in Nature, researchers from the University of Amsterdam demonstrate the atypical behaviour of topological solitons in a robotic metamaterial, which may be used to control how robots move, sense their surroundings and communicate.
Topological solitons can be found in many places and at many different length scales. For example, they take the form of kinks in coiled telephone cords and large molecules such as proteins. At a very different scale, a black hole can be understood as a topological soliton in the fabric of spacetime. Solitons play an important role in biological systems, being relevant for protein folding and morphogenesis – the development of cells or organs.
The unique features of topological solitons – that they can move around but always retain their shape and cannot suddenly disappear – are particularly interesting when combined with so-called non-reciprocal interactions. “In such an interaction, an agent A reacts to an agent B differently to the way agent B reacts to agent A,” explains Jonas Veenstra, a PhD student at the University of Amsterdam and first author of the new publication.
Veenstra continues: “Non-reciprocal interactions are commonplace in society and complex living systems but have long been overlooked by most physicists because they can only exist in a system out of equilibrium. By introducing non-reciprocal interactions in materials, we hope to blur the boundary between materials and machines and to create animate or lifelike materials.”
The Machine Materials Laboratory where Veenstra does his research specialises in designing metamaterials: artificial materials and robotic systems that interact with their environment in a programmable fashion. The research team decided to study the interplay between non-reciprocal interactions and topological solitons almost two years ago, when then-students Anahita Sarvi and Chris Ventura Meinersen decided to follow up on their research project for the MSc course ‘Academic Skills for Research’.
Solitons moving like dominoes
The soliton-hosting metamaterial developed by the researchers consists of a chain of rotating rods that are linked to each other by elastic bands – see the figure below. Each rod is mounted on a little motor which applies a small force to the rod, depending on how it is oriented with respect to its neighbours. Importantly, the force applied depends on which side the neighbour is on, making the interactions between neighbouring rods non-reciprocal. Finally, magnets on the rods are attracted by magnets placed next to the chain in such a way that each rod has two preferred positions, rotated either to the left or the right.
The robotic metamaterial with a soliton and anti-soliton lying at the boundaries between left- and right-leaning sections of the chain. Each blue rod is connected to its neighbours with pink elastic bands, and a little motor under each rod makes the interactions between neighbouring rods non-reciprocal. Image credit: Jonas Veenstra.
Solitons in this metamaterial are the locations where left- and right-rotated sections of the chain meet. The complementary boundaries between right- and left-rotated chain sections are then so-called ‘anti-solitons’. This is analogous to kinks in an old-fashioned coiled telephone cord, where clockwise and anticlockwise-rotating sections of the cord meet.
When the motors in the chain are turned off, the solitons and anti-solitons can be manually pushed around in either direction. However, once the motors – and thereby the reciprocal interactions – are turned on, the solitons and anti-solitons automatically slide along the chain. They both move in the same direction, with a speed set by the anti-reciprocity imposed by the motors.
Veenstra: “A lot of research has focussed on moving topological solitons by applying external forces. In systems studied so far, solitons and anti-solitons were found to naturally travel in opposite directions. However, if you want to control the behaviour of (anti-)solitons, you might want to drive them in the same direction. We discovered that non-reciprocal interactions achieve exactly this. The non-reciprocal forces are proportional to the rotation caused by the soliton, such that each soliton generates its own driving force.”
The movement of the solitons is similar to a chain of dominoes falling, each one toppling its neighbour. However, unlike dominoes, the non-reciprocal interactions ensure that the ‘toppling’ can only happen in one direction. And while dominoes can only fall down once, a soliton moving along the metamaterial simply sets up the chain for an anti-soliton to move through it in the same direction. In other words, any number of alternating solitons and anti-solitons can move through the chain without the need to ‘reset’.
Motion control
Understanding the role of non-reciprocal driving will not only help us better to understand the behaviour of topological solitons in living systems, but can also lead to technological advances. The mechanism that generates the self-driving, one-directional solitons uncovered in this study, can be used to control the motion of different types of waves (known as waveguiding), or to endow a metamaterial with a basic information processing capability such as filtering.
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Future robots can also use topological solitons for basic robotic functionalities such as movement, sending out signals and sensing their surroundings. These functionalities would then not be controlled from a central point, but rather emerge from the sum of the robot’s active parts.
All in all, the domino effect of solitons in metamaterials, now an interesting observation in the lab, may soon start to play a role in different branches of engineering and design.
Source: University of Amsterdam
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#artificial#black hole#Blue#blur#Cells#course#Design#development#direction#domino#engineering#Environment#fashion#Features#form#Fundamental physics news#Future#Hosting#how#interaction#it#Link#Magnets#materials#metamaterials#molecules#motion control#movement#nature#One
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AI's crystal ball: Predicting future camera features in 2034
What features will cameras have ten years from now that cameras do not have now? I asked Gemini AI. Here are the answers.
AI’s Crystal Ball – Predicting future camera features in 2034. Image by Justin Clark from Unsplash.
I don’t know that AI – our new buzzword for what is largely machine learning – has a crystal ball. But Google’s Gemini is pretty good at scraping the internet for information…
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#2034#3D#AI#astroscape#bio-inspired#cameras#CMOS#computational#connectivity#crystal ball#dots#future#Geminimodular#holographic#long exposure#metamaterials#night photography#night sky#predicting#quantum#sensors#technology
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Not Science Fiction: Scientists Around the World Shocked by Self-Healing in Metal
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New AI tool discovers realistic 'metamaterials' with unusual properties
A coating that can hide objects in plain sight, or an implant that behaves exactly like bone tissue—these extraordinary objects are already made from "metamaterials." Researchers from TU Delft have now developed an AI tool that not only can discover such extraordinary materials but also makes them fabrication-ready and durable. This makes it possible to create devices with unprecedented functionalities. They have published their findings in Advanced Materials.
The properties of normal materials, such as stiffness and flexibility, are determined by the molecular composition of the material, but the properties of metamaterials are determined by the geometry of the structure from which they are built. Researchers design these structures digitally and then have it 3D-printed. The resulting metamaterials can exhibit unnatural and extreme properties. Researchers have, for instance, designed metamaterials that, despite being solid, behave like a fluid.
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#Materials Science#Science#Metamaterials#Computational materials science#TU Delft#Artificial intelligence
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Metamaterials in Medicine: A New Era for Future Orthopedics _ Crimson Publishers
Metamaterials in Medicine: A New Era for Future Orthopedics by Hamid RS Hosseinzadeh* in Crimson Publishers: Peer Reviewed Orthopedic Research Journals
Metamaterials are synthetic materials engineered to provide properties which “may not be available in nature that we know”. These materials usually earn their properties from structure rather than composition. The essential property in metamaterials is their unusual and desired properties that appear due to their unique design & structure [1].
In 1898 J.C. Bose showed the possibility of existence of artificial material by conducting microwave experiment on twisted structure. Later, in 1968, Russian physicist Victor Veselago considered the electromagnetic properties of a hypothetical materialwhose electric permittivity and magnetic permeability were both negative [2]. Such a material, as Veselago mentioned, did not exist in nature. Smith et al. had recognized gradient refractive index medium to bend electromagnetic waves. Metamaterial opened up a new exciting world for the scholars.
The word was first coined by Rodger M Walser (2001) who gave the following definition: Metamaterials are defined as macroscopic composites having a man-made, three dimensional, periodic cellular architecture designed to produce an optimized combination, not available in nature, of two or more responses to a specific excitation [3]. In metamaterials, inclusion of small inhomogeneities can produce effective macroscopic behavior. So, embedding artificially fabricated inclusions in a specific host medium will provide the designer with an ample collection of independent parameters such as properties of host materials and properties related to size, shape, and compositions of inclusions. All these design parameters can play a key role in getting the expected result.
For more Open access journals in Crimson Publishers please click on below link https://crimsonpublishersresearch.com/
For more article in Peer Reviewed Orthopedic Research Journals please click on below link https://crimsonpublishers.com/oproj/
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Metamaterials Market 2022 Global Industry Extensive Competitive Landscape on Size, Volume, Trends, Share and Revenue| Regional Forecast By 2028
Metamaterials Market 2022 Global Industry Extensive Competitive Landscape on Size, Volume, Trends, Share and Revenue| Regional Forecast By 2028
This report studies the Metamaterials Market with many aspects of the industry like the market size, market status, market trends and forecast, the report also provides brief information of the competitors and the specific growth opportunities with key market drivers. Find the complete Metamaterials Market analysis segmented by companies, region, type and applications in the report.
The report…
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#Covid-19 Impact Analysis#Metamaterials#Metamaterials forecast#Metamaterials Industry#Metamaterials Market#Metamaterials price#Metamaterials report#Metamaterials research#Metamaterials share#Metamaterials trends
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ive been rewatching the owl house the past 2 days and today while rewatching i drew some of my baby sandshrew ocs
cupid the sandran (sandshrew/nidoran m), grandloves the alolan sandshrew, metamaterial the volcanion/sandshrew
#ive owned cupid since like 2005#he was one of my first ever pokemon ocs i rped on furcadia#his name used to just be sandran but i changed it to cupid recently#sandshrew is my fave pokemon so i have#a lot of them lol#oc: cupid#oc: grandloves#oc: metamaterial#sandshrew#pokemon#hybrid#my ocs
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Mechanical Engineer Job Openings,Search Mechanical Engineer Job Opportunities in India
There is a lot of work to perform as a mechanical engineer in any sector like electric generators, internal combustion engines, and steam and gas turbines, as well as power-using machines, such as refrigeration and air-conditioning systems. In each and every industry there is certain work for the mechanical engineer as in Indian Navy, Aircraft sector and different domestic industry and many more.
#PlacementIndia.#mechanicalengineer#engineering#manufacturing#mechanicalengineering#electricalengineering#mechanicaldesign#mechanicalengineers#engineer#mechanical metamaterial
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Afterlife/Otherside Mini Micro Nano Luma Photonics experiment # 240
#youtube#premiere#gradient#curvature#mini#micro#nano#luma#metamaterials#afterlife#otherside#projection#experiment#miniature#spirits#ghosts#interdimentional#ghost#lightbeings#demonstration#broadcast
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