Results 51 to 60 of about 590,410 (251)

Multichannel full-space coding metasurface with linearly-circularly-polarized wavefront manipulation

Nanophotonics
Achieving independent multitasked wavefront control by using an ultrathin plate is a challenge to increase information capacity in integration optics and radar applications.
Luo Huiling, Gao Huanhuan, Wang Yanzhao, Wang Chaohui, Zhang Fan, Shao Yanzhang, Liu Tong, Wang Zhengjie, Xu He-Xiu   +8 more
doaj   +1 more source

Research on Fault Diagnosis Method Based on Rule Base Neural Network

Journal of Control Science and Engineering, 2017
The relationship between fault phenomenon and fault cause is always nonlinear, which influences the accuracy of fault location. And neural network is effective in dealing with nonlinear problem.
Zheng Ni, Zhang Lin, Wang Wenfeng, Zhang Bo, Liu Yongjin, Zhang Dajiang   +5 more
doaj   +1 more source

Study on the Equivalent Conversion and Utilisation Model of Solar Energy and its Benefits [PDF]

E3S Web of Conferences
Relying on the energy local area network (LAN), we study the equivalent conversion relationship between different “energy qualities” in the process of solar energy conversion and utilisation and its benefit model.
Yuan Wenzhao, Wang Wengfeng, Liu Jinsong
doaj   +1 more source

A “Tech First” Approach to Foreign Policy? The Three Meanings of Tech Diplomacy

Global Policy, EarlyView.
ABSTRACT Scholars have recently argued that international politics is plagued by instability as the world rapidly transitions from one crisis to another. This state of “Permacrisis,” or permanent crises between states, is driven by technological innovations which create new kinds of crises and drive competitions between adversarial states.
Ilan Manor
wiley   +1 more source

Beyond Manoeuvre Theory for European Defence

Global Policy, EarlyView.
ABSTRACT This article contributes to the debate about European defence in the light of the Russo‐Ukraine war and growing doubts about US commitment to Europe. It argues that Europeans need to fundamentally relearn the ability to imagine military strategy from a European viewpoint.
Lukas Mengelkamp, Sam Vincent
wiley   +1 more source

Radar-Infrared Multi-Scale Bi-Stealth via Optically Transparent Chaotic Coding Metasurface

Nano-Micro Letters
Highlights A chaotic paradigm combined with a multi-scale strategy is proposed for radar-IR Bi-stealth based on a single-layer indium tin oxide metasurface. The metadevice achieves ≥10 dB RCS reduction (8–18 GHz, ≤45°), low IR emissivity (
Yanzhao Wang, Yanzhang Shao, Dan Liu, Zhixuan Hu, Yifei Xu, Huanhuan Gao, Xihong Wang, Xiaogang Su, Fei Ding, He-Xiu Xu   +9 more
doaj   +1 more source

The Unintended Consequences of German Deterrence

Global Policy, EarlyView.
ABSTRACT Germany's evolving deterrence posture boils down to continued participation in NATO nuclear sharing and an ambitious conventional rearmament program. Due to its non‐nuclear status and a result of decades of underinvestment, Germany prioritizes modern conventional weapons.
Ulrich Kühn
wiley   +1 more source

Transatlantic Missile Defense Architecture: Defining the Right Threat Set

, 2015
Attempting to defend Europe against a Russian ballistic missile attack would be "extremely challenging and costly," according to the State Department's top missile defense official.
Kibaroğlu, Mustafa
core  

‘Having Your (Digital) Cake and Eating It’: Reconciling EU Strategic Narratives on Connectivity and Autonomy

Global Policy, EarlyView.
ABSTRACT This article examines the EU's evolving narratives concerning the governance of digital technologies, focusing on the intersection of geopolitical challenges and internal policymaking through the lens of the strategic narratives approach. This compares two key EU narratives relating to digital policy: on the one hand, the narrative on ‘digital
Flavia Lucenti, Celeste Bonnamy, Thomas Christiansen, Ville Sinkkonen, Sophie Vanhoonacker   +4 more
wiley   +1 more source

Space-Based Missile Defense

Science & Global Security
This paper reviews the technical issues underlying space-based boost-phase missile defense and examines the current technology available for space-based interceptors and the characteristics of the missiles such a system would face. It then analyzes a particular space-based missile defense system that has been proposed to intercept in boost, ascent, and
openaire   +2 more sources