Results 51 to 60 of about 21,556 (239)

Propagation of Correlation Singularities of a Partially Coherent Field

Optics
We investigate the structure of correlation singularities for the Laguerre–Gauss beam of order n=0 and m=2 in the transverse plane during the propagation of the beam in the beam-wander model.
Jinhyung Lee, Geunwoong Jeon, Byeongjun Yoon, Donghyun Kim, Hyeunwoo Kim, Sun-Myong Kim   +5 more
doaj   +1 more source

Optimization of cw sodium laser guide star efficiency

, 2009
Context: Sodium laser guide stars (LGS) are about to enter a new range of laser powers. Previous theoretical and numerical methods are inadequate for accurate computations of the return flux and hence for the design of the next-generation LGS systems ...
Bellanger, Bradley, Budker, d'Orgeville, D. Bonaccini Calia, D. Budker, Denman, Dmitriev, Drob, Fried, Guillet de Chatellus, Happer, Happer, Happer, Hillman, J. M. Higbie, Kartoshkin, McClelland, Milonni, Milonni, Milonni, Morris, Moussaoui, Nagengast, Pfrommer, Pique, R. Holzlöhner, Ramsey, Ressler, S. M. Rochester, Simonich, Telle, Telle, Ungar, van der Vorst, W. Hackenberg   +35 more
core   +1 more source

4D Printing of Multimaterial Flexible Magneto‐Active Polymers

Advanced Materials Technologies, EarlyView.
Magneto‐active polymers are 3D‐printed with tunable mechanical and magnetic properties using both superparamagnetic and hard ferromagnetic fillers. Nano‐CT imaging reveals the spatial distribution of particles within the matrix. Programmable magnetization patterns and soft, flexible architectures enable responsive actuation, offering exciting ...
Naji Tarabay, Mahtab Shakibmanesh, Javier Alonso López Medina, Hongyi Guan, Alan Mitchell, Ananya Renuka Balakrishna, Camilo Velez   +6 more
wiley   +1 more source

Practical free-space quantum key distribution over 1 km

, 1998
A working free-space quantum key distribution (QKD) system has been developed and tested over an outdoor optical path of ~1 km at Los Alamos National Laboratory under nighttime conditions.
A. K. Ekert, A. Muller, A. Muller, B. C. Jacobs, C. A. Primmerman, C. G. Peterson, C. H. Bennett, C. H. Bennett, C. H. Bennett, C. H. Bennett, C. M. Simmons, C. Marand, G. G. Luther, G. L. Morgan, G. S. Vernam, H. Zhilin, J. D. Franson, J. E. Nordholt, J. F. Clauser, J. G. Walker, P. D. Townsend, P. D. Townsend, P. G. Kwiat, R. J. Hughes, R. J. Hughes, R. J. Hughes, R. J. Hughes, S. F. Seward, S. K. Lamoreaux, W. K. Wooters, W. T. Buttler, W. T. Buttler, W. T. Buttler   +32 more
core   +1 more source

Degradation Mechanisms in PEM Water Electrolysis: Diagnosis and Impact

Advanced Materials Technologies, EarlyView.
This review provides an analysis of degradation mechanisms in proton electrolyte membrane water electrolyzers (PEMWE), focusing on all key components. It discusses diagnostic and measurement techniques for evaluating degradation, less‐studied mechanisms, and an expert survey.
Annik Bernhardt, Katja Lange, Robert Göckeritz, Erik Grunwald, Angelika Hähnel, Alexander Müller, Volker Naumann, Sistan Rasuli, Wolfram Münchgesang, Bruno G. Pollet, Kerstin Witte‐Bodnar, Klemens Ilse   +11 more
wiley   +1 more source

Research on the system error performance of coherent orthogonal frequency division multiplexing system with M-distribution in satellite-to-ground laser communication

Tongxin xuebao, 2020
In order to alleviate the influence of atmospheric turbulence on the performance of satellite-to-ground laser communication system,based on the M-distribution atmospheric channel model,a multi-carrier coherent orthogonal frequency division multiplexing ...
Yi WANG, Yaping WANG
doaj   +2 more sources

New Directions in Focused Ion Beam Induced Deposition for the Nanoprinting of Functional 3D Heterostructures

Advanced Materials Technologies, EarlyView.
Here, it is shown that focused ion beam induced deposition (FIBID) using helium and neon ions enables advanced high‐resolution 3D nanoprinting achieving precise multimaterial architectures and engineered internal voids. Thus, FIBID with finely focused noble gas ion species is presented as a unique platform for designing functional nanomaterials for ...
Frances Isabel Allen
wiley   +1 more source

Grounding action in visuo-haptic space using experience networks [PDF]

, 2010
Traditional approaches to the use of machine learning algorithms do not provide a method to learn multiple tasks in one-shot on an embodied robot. It is proposed that grounding actions within the sensory space leads to the development of action-state ...
Glover, Arren, Schulz, Ruth, Wiles, Janet, Wyeth, Gordon   +3 more
core   +1 more source

Magnetic Textiles: A Review of Materials, Fabrication, Properties, and Applications

Advanced Materials Technologies, EarlyView.
Magnetic textiles (M‐textiles) are emerging as a programmable materials platform that merges magnetic matter with hierarchical textile structures. This article consolidates magnetic material classes, textile architectures, and fabrication and magnetization strategies, revealing structure–property–function relationships that govern magneto‐mechanical ...
Li Ke, Moses Kumi, Xiaoming Tao, Junhong Pu   +3 more
wiley   +1 more source

Generation of vector vortex pin-like beams and their propagation in turbulent atmosphere

APL Photonics
Atmospheric turbulence consistently poses a significant challenge to the stable propagation of laser beams, particularly over long distances, as is often the case in free-space optical communication systems. To mitigate the adverse effects of atmospheric
Jia Li, Huijian Liang, Gaofeng Wu, Peipei Peng, Fei Wang, Yangjian Cai   +5 more
doaj   +1 more source