Results 121 to 130 of about 12,224 (294)

OPTIMAL OPERATIONS PLANNING FOR SAR SATELLITE CONSTELLATIONS IN LOW EARTH ORBIT

, 2005
Satellite constellations for Earth observation are remarkably useful, powerful and exible tools, but their realisation and maintenance pose a big issue on costs.
Zehetbauer, Tino, Neff, Thomas, De Florio, Sergio   +2 more
core  

Analysis of Starlink Constellation Technical System and Prospects for Development Trends

天地一体化信息网络
At present, the construction of global low-orbit satellite constellations and the commercialization process of satellite internet are accelerating, and a satellite communication network with global coverage, ubiquitous interconnection and deep ...
Shang Huichao, Feng Guanghua, Wei Xiao, Cui Xiang, Wu Di   +4 more
doaj  

Steering Oxygen Activation Pathways via Redox Dual‐Defects in 2D Hydrated WO3 for High‐Yield Singlet Oxygen Evolution

Advanced Functional Materials, EarlyView.
Redox dual‐defects (Cs substitution and O vacancies) in 2D hydrated WO3 steer O2 activation toward selective singlet oxygen evolution. WO‐CO achieves 8.6–15.8 times higher 1O2 production than single‐defect or pristine catalysts, enabling efficient pollutant mineralization via a pathway‐selective photocatalytic mechanism.
Sheng‐Qi Guo, Mingqi Xiao, Fangyuan Zhang, Hui Li, Yuli Jia, Zhenfang Zhang, Liqun Ye, Bo Yang, Tianyi Ma   +8 more
wiley   +1 more source

Design of Micro-satellite Constellation for Communication

, 2014
補正完畢國際20101101~20101103紙本YTaipei ...
Ma, Der-Ming; Hong, Zuu-Chang; Chang, Bo-Jyun
core  

Internetworking with satellite constellations

, 2012
Here, we examine networking and internetworking issues affecting satellite networking in complex satellite constellation networks, and determine what is needed in order to support services based on the TCP/IP suite well in satellite constellations.
openaire   +1 more source

Time‐Resolved Magnetization Switching Dynamics Driven by Orbital Torques

Advanced Functional Materials, EarlyView.
Du et al. reveal nanosecond magnetization switching driven by orbital currents using time‐resolved Hall detection. The measurements separate domain nucleation from domain wall propagation and show that Joule heating strongly assists switching by lowering energy barriers.
Ao Du, Shilei Ding, Min‐Gu Kang, Marco Hoffmann, Pietro Gambardella   +4 more
wiley   +1 more source

Coupling Anodic Activity and Stability at Ni‐Based Non‐Oxide Catalysts via Coordinating Alcohol Oxidation and Oxygen Evolution

Advanced Functional Materials, EarlyView.
A cooperative and competitive interrelationship between alcohol oxidation (AOR) and water oxidation (OER) was observed on a typical anode catalyst of Ni2P. In situ Raman spectroscopy and electrochemical analyses revealed a specific complementary mechanism between them, in which OER and AOR critically contribute to the activity and stability of anodic ...
Yong Yan, Xinyu Liu, Yuguo Zhao, Hanwen Jian, Huan Zhou, Riyi Zhang, Dong Wang, Peter Schaaf, Lihua Wang, Guangsheng Guo, Xiayan Wang   +10 more
wiley   +1 more source

Support‐Controlled Reaction Pathways via Dynamic Sulfur‐Mediated Interfaces for Selective Urea Electrolysis

Advanced Functional Materials, EarlyView.
Sulfur‐doped graphitized carbon nanofibers act as adaptive catalyst–support platforms, enabling dynamic sulfur‐mediated reconstruction and strong metal–support interactions. This unique behavior enhances catalyst stability and controls reaction pathways, achieving highly selective urea oxidation (∼92% N2) coupled with efficient hydrogen evolution ...
Melanie Guillén‐Soler, Lucía Vizcaíno‐Anaya, Ahmad Tayyebi, José Manuel Vila‐Fungueiriño, María del Carmen Giménez‐López   +4 more
wiley   +1 more source

Giant Magnetic Coercivity Driven by Spin‐Bag Ferromagnetism in Epitaxial Sr3YCo4O10+δ Films with Engineered 2D Oxygen Vacancy Ordering

Advanced Functional Materials, EarlyView.
A giant magnetic coercivity and a vertical shift of hysteresis loops are demonstrated in Sr3YCo4O10+δ epitaxial films. The hard magnetic behavior originates from ferromagnetic spin bags stabilized within a long‐range ordered oxygen‐vacancy structure.
Yanbin Chen, Roger Guzman, Xiaomin Jia, Jialu Wu, Xing Xu, Li Sun, Jinbo Pan, Shixuan Du, Myung‐Hwan Whangbo, Wu Zhou, Jing Ma, Ce‐wen Nan, Chonglin Chen   +12 more
wiley   +1 more source

Electro-optic Satellite Constellation Design Using Multi-Objective Genetic Algorithm

, 2020
Satellite constellation design is a complex, highly constrained, and multidisciplinary problem. Unless optimization tools are used, tradeoffs must be conducted at the subsystem level resulting in feasible, but not necessarily optimal, system designs.
Tamer, Yasin
core