Results 91 to 100 of about 115,708 (333)

Infrared stealth metamaterials

Cailiao gongcheng, 2020
The basic principles and methods of infrared radiation and infrared stealth technology were discussed in this paper. It was found that flexible regulation of multi-band spectrum was the key to realize infrared stealth compatible with radar stealth, laser
LIU Xiao-ming, REN Zhi-yu, CHEN Lu-ping, LI Guo-jian, WANG Qiang, ZHOU Ji   +5 more
doaj   +1 more source

Ultralow‐Frequency Epsilon‐Near‐Zero States in 3D‐Printed High‐Entropy Alloy Metacomposites for Ultra‐Thin Perfect RF Absorption

Advanced Materials, EarlyView.
Rozanov causality limit—a compulsive proportional thickness‐wavelength relationship (nd ∝ λ)—makes it challenging to develop perfect absorption with both thin thickness and low frequency. Herein, a cocktail effect in high‐entropy alloys (HEA) is crucially utilized for lowering plasma frequency to achieve epsilon‐near‐zero states, which finally enables ...
Peitao Xie, Haikun Wu, Zhenxiang Cheng, Mingxiang Liu, Yuan Liu, Weikong Pang, Runhua Fan, Yao Liu   +7 more
wiley   +1 more source

Influence of Cockpit and Inlet on Electromagnetic Scatterings for a Flying-wing Configuration

Hangkong gongcheng jinzhan, 2019
The cockpit and inlet play an important role for aircraft stealth performance.In order to analyze the scattering characteristics of cockpit and inlet, four kinds electromagnetic models with different components are established.The influence of radar ...
Liu Zhanhe, Wang Jing, Wang Xiaolu, Zhou Peng, Shi Jinxiang   +4 more
doaj   +1 more source

Classical Disordered Ground States: Super-Ideal Gases, and Stealth and Equi-Luminous Materials

, 2008
Using a collective coordinate numerical optimization procedure, we construct ground-state configurations of interacting particle systems in various space dimensions so that the scattering of radiation exactly matches a prescribed pattern for a set of ...
Ashcroft N. W., Feynman R. P., Frank H. Stillinger, Hansen J. P., Joannopoulos J. D., Press W. H., Robert D. Batten, Salvatore Torquato   +7 more
core   +1 more source

Terahertz Volume Plasmon‐Polariton Modulation in All‐Dielectric Hyperbolic Metamaterials

Advanced Optical Materials, EarlyView.
THz volume plasmon‐polariton (VPP) propagation through plasmon‐based hyperbolic metamaterials, made of alternating layers of doped and undoped III‐V semiconductors. Abstract The development of plasmonics and related applications in the terahertz range faces limitations due to the intrinsic high electron density of the standard metals.
Stefano Campanaro, Luca Bursi, Stefano Curtarolo, Arrigo Calzolari   +3 more
wiley   +1 more source

Organic Light‐Emitting Diode in Phototherapy Applications

Advanced Photonics Research, EarlyView.
This article systematically reviews the development of organic light‐emitting diodes (OLEDs) in phototherapy, constructs a technical framework, and establishes a multidimensional knowledge graph encompassing indications, wavelengths, and light intensity.
Yingguang Zhu, Yonglan Hu, Yingjie Cui, Lixue Guo, Guohui Zhang, Haixia Qiu, Defu Chen, Changyong Pan, Huijuan Yin, Suling Zhao   +9 more
wiley   +1 more source

Tunable Multifunctional Terahertz Coding Metasurface for Polarization Manipulation

Advanced Photonics Research, EarlyView.
Coding metasurfaces (CMs) offer versatile control over electromagnetic waves. Herein, a tunable multifunctional terahertz (THz) metasurface integrated with vanadium dioxide (VO2) is presented, enabling propagation‐phase manipulation of linearly polarized waves and hybrid‐phase control of circularly polarized waves.
Chunsheng Zhang, Tingnuo Pan, Xiao Zhang, Wenjia Li, Bo Lv, Yuxiang Li, Zheng Zhu, Chunying Guan, Wanying Liu, Xiaohan Jiang, Jinhui Shi   +10 more
wiley   +1 more source

Conceptualising quality early childhood education: Learning from young children in Brazil and South Africa through creative and play‐based methods

British Educational Research Journal, EarlyView., 2023
Abstract Early childhood has increasingly been acknowledged as a vital time for all children. Inclusive and quality education is part of the United Nations Sustainable Development Goals, with the further specification that all children have access to quality pre‐primary education.
Laura H. V. Wright, Irene Rizzini, Malibongwe Gwele, Lynn McNair, Cristina Laclette Porto, Marsha Orgill, E. Kay M. Tisdall, Malcolm Bush, Linda Biersteker   +8 more
wiley   +1 more source

Gradient-Based Aero-Stealth Optimization of a Simplified Aircraft

Fluids
Modern fighter aircraft increasingly need to conjugate aerodynamic performance and low observability. In this paper, we showcase a methodology for a gradient-based bidisciplinary aero-stealth optimization.
Charles Thoulon, Gilbert Roge, Olivier Pironneau   +2 more
doaj   +1 more source

Motivation by Stealth?

, 2017
Buried beneath the conversation or, if preferred, the simmering debate about if and how we should be teaching English - in some form, to some end – around the world, is the fact that many of our students are not the least bit interested in what we have to teach them. Should we care?At the heart of the problem, and of this paper, is motivation.
Arab World English Journal, Kathleen Guillaume   +1 more
openaire   +2 more sources