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A liquid crystal walks into an optical resonator: new Skoltech research helps model future optoelect

Credit: Timur Sabirov/Skoltech
Researchers at Skoltech and their colleagues proposed a photonic device from two optical resonators with liquid crystals inside them to study optical properties of this system that can be useful for future generations of optoelectronic and spinoptronic devices. The paper was published in the journal
Physical Review B.
The simplest kind of optical resonator consists of two mirrors directly opposite each other, squeezing light between them. When you stand inside a mirror resonator, you see infinite copies of yourself in the mirrors; when a liquid crystal - the kind in your computer and smartphone screen - is placed into a much smaller and a bit more complex resonator, interesting things tend to happen. Since the orientation of the liquid crystal molecules can be changed by applying an electric current, researchers were able to control various characteristics of light propagation inside the resonator and, in some sense, simulate the opera ....

Pavlos Lagoudakis , Pavel Kokhanchik , University Of Southampton , Massachusetts Institute Of Technology , University Of Warsaw , Physical Review , Skoltech Professor Pavlos Lagoudakis , Experimental Physics , Massachusetts Institute , Chemistry Physics Materials Sciences , Mathematics Statistics , Technology Engineering Computer Science , Research Development , Atomic Physics , பல்கலைக்கழகம் ஆஃப் சவுத்தாம்ப்டன் , மாசசூசெட்ஸ் நிறுவனம் ஆஃப் தொழில்நுட்பம் , பல்கலைக்கழகம் ஆஃப் வார்சா , உடல் விமர்சனம் , சோதனை இயற்பியல் , மாசசூசெட்ஸ் நிறுவனம் , வேதியியல் இயற்பியல் பொருட்கள் அறிவியல் , கணிதம் புள்ளிவிவரங்கள் , தொழில்நுட்பம் பொறியியல் கணினி அறிவியல் , ஆராய்ச்சி வளர்ச்சி , அணு இயற்பியல் ,

Microwave-assisted recording technology promises high-density hard disk performance

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IMAGE: Comparison between conventional HDD write head and newly proposed flux control HDD write head. In the flux control HDD write head, the magnetization of the FC device is reversed against.
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Credit: Hirofumi Suto
WASHINGTON, March 9, 2021 Researchers at Toshiba Corporation in Japan have studied the operation of a small device fabricated in the write gap of a hard disk drive s write head to extend its recording density. The device, developed by HWY Technologies, is based on a design concept known as microwave-assisted magnetic recording, or MAMR.
This technology, reported in the
Journal of Applied Physics, by AIP Publishing, uses a microwave field generator known as a spin-torque oscillator. The spin-torque oscillator emits a microwave field causing the magnetic particles of the recording medium to wobble the way a spinning top does. This makes them much easier to flip over when the write head applies a recording magnetic ....

United States , Masayuki Takagishi , Akihiko Takeo , Hitoshi Iwasaki , Hirofumi Suto , Naoyuki Narita , Tazumi Nagasawa , Tomoyuki Maeda , Gaku Koizumi , Researchers At Toshiba Corporation , Toshiba Corporation , Applied Physics , Chemistry Physics Materials Sciences , Technology Engineering Computer Science , Computer Science , Electrical Engineering Electronics , ஒன்றுபட்டது மாநிலங்களில் , ஹிரோபூமி சூட்டோ , ஆராய்ச்சியாளர்கள் இல் தோஷிபா நிறுவனம் , தோஷிபா நிறுவனம் , பயன்படுத்தப்பட்டது இயற்பியல் , வேதியியல் இயற்பியல் பொருட்கள் அறிவியல் , தொழில்நுட்பம் பொறியியல் கணினி அறிவியல் , கணினி அறிவியல் , மின் பொறியியல் மின்னணுவியல் ,

Researchers modify air quality models to reflect polluted reality in Latin America

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IMAGE: Computational models of air quality have long been used to shed light on pollution control efforts in the United States and Europe, but the tools have not found widespread adoption.
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Credit: James East
Computational models of air quality have long been used to shed light on pollution control efforts in the United States and Europe, but the tools have not found widespread adoption in Latin America. New work from North Carolina State University and Universidad de La Salle demonstrates how these models can be adapted to offer practical insights into air quality challenges in the Americas outside the U.S. ....

United States , Jorge Pachon , Juan Sebastian Montealegre , Garcia Menendez , James East , Fernando Garcia Menendez , Carolina State University , North Carolina State University , Universidad De La Salle , Latin America , Latin American , Atmospheric Science , Pollution Remediation , Mathematics Statistics , Algorithms Models , Technology Engineering Computer Science , Biomedical Environmental Chemical Engineering , Civil Engineering , ஒன்றுபட்டது மாநிலங்களில் , ஜார்ஜ் பசொன் , ஜுவான் செபாஸ்டியன் மோந்டோளெகிரே , கார்சியா மெனண்டெஸ் , ஜேம்ஸ் கிழக்கு , பெர்னாண்டோ கார்சியா மெனண்டெஸ் , கரோலினா நிலை பல்கலைக்கழகம் , வடக்கு கரோலினா நிலை பல்கலைக்கழகம் ,

Solid-state batteries could be made more cleanly by scaling-up flash sintering

Credit: University of Warwick
Flash sintering is a ceramic processing technique which uses electric current to intensively heat the ceramic sample internally rather than using only external furnace heating. The process can lower ceramic processing temperatures and durations significantly, enabling ceramics to be co-processed with metals or other materials, and reducing energy use.
However, the process can result in low quality ceramics due to weaknesses caused by inhomogeneities in the microstructure.
The origins of these inhomogeneities caused by thermal gradients in the material during flash sintering have been studied by researchers based at WMG, University of Warwick and academic and industrial collaborators, and routes to mitigate the effects of these gradients are outlined. ....

Gareth Jones , Normandie Universit , University Of Warwick , University Of Trento , Ceramics Group , Wuhan University Of Technology , Lucideon Ltd , Wuhan University , Claire Dancer , Sustainability Directorate , Chemistry Physics Materials Sciences , Energy Fuel Non Petroleum , Industrial Engineering Chemistry , Technology Engineering Computer Science , Electrical Engineering Electronics , கரேத் ஜோன்ஸ் , பல்கலைக்கழகம் ஆஃப் வார்விக் , பல்கலைக்கழகம் ஆஃப் ட்ரெண்டோ , சிஇஆர்ஏஎம்ஐசிஎஸ் குழு , கிளாரி நடனமாடுபவர் , நிலைத்தன்மை இயக்குநரகம் , வேதியியல் இயற்பியல் பொருட்கள் அறிவியல் , ஆற்றல் எரிபொருள் அல்லாத பெட்ரோலியம் , தொழில்துறை பொறியியல் வேதியியல் , தொழில்நுட்பம் பொறியியல் கணினி அறிவியல் , மின் பொறியியல் மின்னணுவியல் ,

Someone to watch over AI and keep it honest - and it's not the public!

Dr Bran Knowles, a senior lecturer in data science at Lancaster University, says: I m certain that the public are incapable of determining the trustworthiness of individual AIs. but we don t need them to do this. It s not their responsibility to keep AI honest. ....

New York , United States , Johnt Richards , Ibm Tj Watson Research Center , Lancaster University , Sanction Of Authority , Artificial Intelligence , Bran Knowles , Promoting Public Trust , Research Center , Yorktown Heights , Business Economics , Mathematics Statistics , Technology Engineering Computer Science , Computer Science , Electrical Engineering Electronics , Mechanical Engineering , Research Development , Robotry Artificial Intelligence , Technology Transfer , புதியது யார்க் , ஒன்றுபட்டது மாநிலங்களில் , ஐபீயெம் ஜ் வாட்சன் ஆராய்ச்சி மையம் , லான்காஸ்டர் பல்கலைக்கழகம் , அனுமதி ஆஃப் அதிகாரம் , செயற்கை உளவுத்துறை ,