Results 31 to 40 of about 72,125 (260)
Observation of hypersonic phononic crystal effects in porous silicon superlattices [PDF]
, 2009 Brillouin light scattering experiments were carried out on porous silicon superlattices with modulation wavelengths in the range 37–167 nm. Phonon frequencies deduced from the Brillouin spectra show good agreement with those obtained from an elastic ...
Aliev G., G. T. Andrews, L. C. Parsons
core +1 more source
When does category spanning hurt or help producers?
Strategic Management Journal, EarlyView.Abstract Research Summary Scholars have theorized many factors shaping whether category spanning helps or hurts producers. We first synthesize evidence by meta‐analyzing 25 years of empirical research, which reveals a null effect of spanning on average, yet with significant subsample heterogeneity. To unpack it, we theorize and find that spanning hurts
Jungsoo Ahn +2 more
wiley +1 more source
Deep transfer learning for three-dimensional aerodynamic pressure prediction under data scarcity
Theoretical and Applied Mechanics LettersAerodynamic evaluation under multi-condition is indispensable for the design of aircraft, and the requirement for mass data still means a high cost. To address this problem, we propose a novel point-cloud multi-condition aerodynamics transfer learning ...
Hao Zhang +4 more
doaj +1 more source
Research on Aerothermoelasticity for Hypersonic Inlet with Complex Internal Flow
气体物理, 2023 Hypersonic inlet is very easy to induce aerothermoelastic problems under the aerodynamic load and aero-thermal action of complex flow. Deeply understanding the aerothermoelasticity mechanism of complex internal flow is of great significance for the ...
Kun YE, Yi-fan ZHANG, Zheng-yin YE
doaj +1 more source
Heat protection apparatus Patent [PDF]
, 1966 Development of thermal insulation system for wing and control surfaces of hypersonic aircraft and reentry ...
Hill, P. R., Trout, O. F., Jr.
core +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
Performance modeling of flame-assisted fuel cells based on a swirl burner
AIP AdvancesAiming at the problems of a narrow operating range and complex modeling of Flame-assisted Fuel Cells (FFCs), an FFC system based on a swirl burner is proposed, and neural network algorithms are used to construct the prediction model for the polarization ...
Yiming Liu +4 more
doaj +1 more source
Applied SciencesCompressor characteristic evaluation is a critical step in design and optimization. Corrected characteristic curves are typically derived via experimental testing or CFD computation which is typically executed through manual manipulation. For compressors
Junbing Liu, Xiaoqiang Fan, Xiao Tang
doaj +1 more source
Transition in Hypersonic Boundary Layers: Role of Dilatational Waves
, 2015 Transition and turbulence production in a hypersonic boundary layer is investigated in a Mach 6 quiet wind tunnel using Rayleigh-scattering visualization, fast-response pressure measurements, and particle image velocimetry.
Chen, Shiyi +7 more
core +2 more sources
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