Results 51 to 60 of about 2,387,085 (259)
Collaborating in future states—Contextual instability, paradigmatic remaking, and public policy
Australian Journal of Public Administration, EarlyView.Abstract Collaboration is ubiquitous in public policy life, with its presence and profile determined by prevailing governance conditions. Commitments to globalisation and marketisation in the latter part of the 20th century marked the onset of an era defined by collaboration, between and across tiers and spheres of government, with non‐state actors ...
Helen Sullivan
wiley +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
IEEE Access, 2021 In this paper, the problem of attitude control for hypersonic vehicle in the present of actuator fault and unknown uncertainties including modeling uncertainties, aerodynamic parameters uncertainties is investigated based on integral sliding mode ...
Fuhui Guo, P. Lu
semanticscholar +1 more source
Aerospace, 2023 In this paper, aimed at the problem of large temperature gradient thermal testing with the typical sharp wedge leading edge structure of a hypersonic vehicle, a subsonic high-temperature combustion gas heating (SHCH) test device is used to conduct a ...
Ri Wang +5 more
doaj +1 more source
Third or “Second and a Half”? Continuity, Path Dependence, and the Third Nuclear Age
Global Policy, EarlyView.ABSTRACT The world has entered a new nuclear age. Scholars have characterized this “third nuclear age” as one of renewed competition among nuclear‐armed great powers and the coming maturation of new technologies. I trace the origins of the new nuclear age. Focusing primarily on US strategies with two case studies on conventional strike capabilities and
Jan Ludvik
wiley +1 more source
Brazing ZrB2 ultra‐high‐temperature ceramics to Zr metals for hypersonic thermal protection systems
International Journal of Applied Ceramic Technology, EarlyView.Abstract Porous and dense zirconium diboride (ZrB2) materials are promising ultra‐high‐temperature ceramics (UHTCs) for transpiration cooling in hypersonic applications, providing an effective means to reduce component temperatures and mitigate oxidation effects. While porous ZrB2 enables coolant flow, dense ZrB2 offers structural integrity.
Younes Belrhiti +4 more
wiley +1 more source
Effect of Wavy Wall on the Stability of Conical Hypersonic Boundary Layer at Small Angle of Attack
气体物理In order to obtain a high lift-drag ratio, hypersonic vehicles usually fly with a certain angle of attack. As a potential means to delay hypersonic boundary layer transition at 0° angle of attack, it is not clear how wavy wall affect the deve-lopment of ...
Chengjian ZHANG +4 more
doaj +1 more source
War as a Phenomenon of Inquiry in Management Studies
Journal of Management Studies, EarlyView.Abstract We argue that war as a phenomenon deserves more focused attention in management. First, we highlight why war is an important and relevant area of inquiry for management scholars. We then integrate scattered conversations on war in management studies into a framework structured around three building blocks – (a) the nature of war from an ...
Fabrice Lumineau, Arne Keller
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Intelligent Attitude Control of Hypersonic Vehicle Based on DDQN and Deep Q-Learning from Demonstrations [PDF]
Hangkong bingqiIn order to improve the speed and accuracy of solving the attitude control problem of hypersonic vehicle, an intelligent attitude control method of hypersonic vehicle based on demonstration learning is proposed.
Liu Jingwen, Cai Guangbin, Fan Yonghua, Fan Hongdong, Wu Tong, Shang Yiming
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Journal of the American Ceramic Society, Volume 108, Issue 9, September 2025.➢ A one‐step selective laser reaction pyrolysis (SLRP) technique was developed to rapidly synthesize hafnium carbide (HfC) from liquid polymer precursors. ➢ XRD and TEM confirmed the nanocrystalline structure of the HfC. ➢ The SLRP‐based process achieved up to 54% ceramic yield, 18% higher than furnace‐based methods.
Shalini Rajpoot +3 more
wiley +1 more source