Results 61 to 70 of about 81,958 (286)
Hypersonic Bose-Einstein Condensates in Accelerator Rings [PDF]
Published as Saurabh Pandey et al. Hypersonic Bose--Einstein
condensates in accelerator rings Nature 570 7760 205--209 (2019), 2019 Some of the most sensitive and precise measurements to date are based on matterwave interferometry with freely falling atomic clouds. Examples include high-precision measurements of inertia, gravity and rotation. In order to achieve these very high sensitivities, the interrogation time has to be very long and consequently the experimental apparatus has
arxiv +1 more source
Small, EarlyView.A strategy is presented to tune the elastic properties of Stöber silica microparticles, widely used in phononic materials, by exposing them to moderate electron beam energies. This results in rapid elasticity changes, investigated via Brillouin light scattering, and attributed to radiation‐induced stiffening.
Francesco Bonacci +6 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
Optimal speed of hypersonic cruise flight
Theoretical and Applied Mechanics Letters, 2011 AbstractA coupling frame of speed gain and maintain was suggested to assess the flight performance of hypersonic cruise vehicles (HCV). The optimal cruise speed was obtained by analyzing the flight performance measured by the ratio of initial boost mass to generalized payload.
openaire +2 more sources
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
doaj +1 more source
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
Two-dimensional film cooling over a flat plate in hypersonic flow
Propulsion and Power Research, 2018 Film cooling, as one efficient active cooling method, will hopefully be used in ‘hypersonic vehicles’ in the future. The hypersonic vehicle׳s surface is more likely a flat plate than a blunt body, so the cooling characteristics of two-dimensional (2-D ...
Ying Zhou, Hong Wu, Yulong Li, Yi Cai
doaj
The propagation characteristics of low frequency radio waves in magnetized hypersonic plasma sheaths
AIP Advances, 2023 Communication blackouts have been a main threat to hypersonic vehicles for decades. The low frequency communication was considered a potential approach to mitigate the “blackout.” Nowadays, low frequency transmitters serving underwater communication have
Mingyang Mao +5 more
doaj +1 more source
Forward Defence, Hamas‐Hezbollah War With Israel and Iran's Path to Nuclear Bombs
Global Policy, EarlyView.ABSTRACT In the wake of the Hamas–Hezbollah war with Israel following the 7 October 2023, the Iran–Israel shadow war escalated into direct military conflict. While addressing the characteristics of Iran's deterrence strategy, the present contribution argues that in case of escalation in the Middle East region, the so‐called ‘forward defence’ doctrine ...
Mohammad Eslami, Christian Kaunert
wiley +1 more source
Overview on the Development Research of Vortex Lift Waverider
Hangkong gongcheng jinzhan, 2021 The waverider has good aerodynamic performance in hypersonic flight,however its performance is difficult to maintain when it deviates from the design state.
YI Huaixi, WANG Dou, LI Jun, LUO Shibin
doaj +1 more source