Results 21 to 30 of about 65,352 (268)

A Submicrosecond-Response Ultrafast Microwave Ranging Method Based on Optically Generated Frequency-Modulated Pulses

Sensors
An ultrafast microwave ranging method based on optically generated frequency-modulated microwave pulses is proposed in this study. The theoretical analysis demonstrated that nanosecond-scale linear frequency modulation microwave pulse can be obtained by ...
Yifei Sun, Yongchao Chen, Longhuang Tang, Xing Jia, Heli Ma, Xiang Wang, Long Chen, Shenggang Liu, Tianjiong Tao, Jian Wu, Chengjun Li, Shuanyu Liu, Weilu Chen, Wei Gu, Jia Shi, Jidong Weng   +15 more
doaj   +1 more source

Double-detonation supernovae of sub-Chandrasekhar mass white dwarfs

, 2007
In the "double-detonation sub-Chandrasekhar" model for type Ia supernovae, a carbon-oxygen (C + O) white dwarf accumulates sufficient amounts of helium such that a detonation ignites in that layer before the Chandrasekhar mass is reached. This detonation
Blinnikov, Branch, Branch, Branch, Colella, Colella, Donat, F. K. Röpke, Gamezo, Gamezo, García-Senz, Glaister, Golombek, Guderley, Han, Imshennik, Khokhlov, Livne, Livne, Livne, Livne, M. Fink, Mazzali, Mulder, Niemeyer, Osher, Parthasarathy, Plewa, Ponchaut, Reinecke, Reinecke, Reinecke, Reinecke, Ruiz-Lapuente, Röpke, Röpke, Röpke, Röpke, Röpke, Röpke, Röpke, Röpke, Schmidt, Schmidt, Sharpe, Smiljanovski, Stritzinger, W. Hillebrandt, Wiggins, Wiggins, Woosley, Woosley   +51 more
core   +1 more source

Molecular Dynamics Simulations of Weak Detonations [PDF]

, 2011
Detonation of a three-dimensional reactive non-isotropic molecular crystal is modeled using molecular dynamics simulations. The detonation process is initiated by an impulse, followed by the creation of a stable fast reactive shock wave.
A. N. Dremin, B. M. Rice, D. C. Sorescu, J. A. Zukas, J. Von Neumann, M. Ben-Artzi, M. P. Allen, Morag Am-Shallem, Ronnie Kosloff, Sergey V. Zybin, V. Balalaev, W. Fickett, Ya. B. Zel'dovich, Ya. B. Zel'dovich, Ya. B. Zel'dovich, Yehuda Zeiri   +15 more
core   +2 more sources

Upconversion Photonic Doppler Velocimetry Based on Stimulated Brillouin Scattering

Photonics
Optical up-conversion photonic Doppler velocimetry (PDV) based on stimulated Brillouin Scattering (SBS) with an all-fiber link structure is proposed in this article. Because SBS limits the laser power transmitted by a fiber over long distances, the probe
Long Chen, Cangli Liu, Heli Ma, Longhuang Tang, Xing Jia, Tianjiong Tao, Shenggang Liu, Yongchao Chen, Xiang Wang, Jian Wu, Chengjun Li, Jidong Weng   +11 more
doaj   +1 more source

Detonation front curvatures and detonation rates [PDF]

AIP Conference Proceedings, 2017
Many detonation front curvatures are reviewed. Most are of the Shock Dynamics type, which are described as a combination of quadratic and 8th power-of-the-radius curves. The integrated fraction of the 8th power curve is taken as a measure of curvature, which we are able to relate to the logarithm of the detonation rate.
Lisa M. Lauderbach, K. Thomas Lorenz, Edward L. Lee, P. Clark Souers   +3 more
openaire   +1 more source

Measurement of Ultra-High Speed by Optical Multistage Cascade Frequency Reduction Technology

Applied Sciences
In order to reduce the frequency of high-frequency Doppler signal light, the electronic bandwidth of a data acquisition system is reduced. This paper mainly describes the principle and experimental verification results of optical multistage cascade ...
Heli Ma, Long Chen, Wei Gu, Cangli Liu, Longhuang Tang, Xing Jia, Tianjiong Tao, Shenggang Liu, Yongchao Chen, Xiang Wang, Jian Wu, Chengjun Li, Dameng Liu, Jidong Weng, Huan Liu   +14 more
doaj   +1 more source

Predicted reentrant melting of dense hydrogen at ultra-high pressures

Scientific Reports, 2016
The phase diagram of hydrogen is one of the most important challenges in high-pressure physics and astrophysics. Especially, the melting of dense hydrogen is complicated by dimer dissociation, metallization and nuclear quantum effect of protons, which ...
Hua Y. Geng, Q. Wu
doaj   +1 more source

Off-center ignition in type Ia supernova: I. Initial evolution and implications for delayed detonation [PDF]

, 2006
The explosion of a carbon-oxygen white dwarf as a Type Ia supernova is known to be sensitive to the manner in which the burning is ignited. Studies of the pre-supernova evolution suggest asymmetric, off-center ignition, and here we explore its ...
Hillebrandt, W., Roepke, F. K., Woosley, S. E.   +2 more
core   +2 more sources

Dynamic Testing of Cold Gas Sprayed Bipolar Plates–Porous Transport Layer Coating System in Proton Exchange Membrane Water Electrolysis

Advanced Engineering Materials, EarlyView.
Through direct application of porous transport layer (PTL) on the bipolar plate (BPP) with thermal spraying, the interfacial contact resistance is improved. With the cold gas sprayed BPP–PTL coating system, a proton exchange membrane water electrolysis cell with a cell voltage of Ucell = 1.9 V can be operated up to i = 2.5 A/cm2 in a dynamic mode ...
Kirsten Bobzin, Marvin Erck, Kevin Jasutyn, Katja Radermacher, Andreas Bund, Mario Kurniawan   +5 more
wiley   +1 more source

Descending Modal Transition Dynamics in a Large Eddy Simulation of a Rotating Detonation Rocket Engine

Energies, 2021
Rotating detonation rocket engines (RDREs) exhibit various unsteady phenomena, including modal transitions, that significantly affect their operation, performance and stability.
Armani Batista, Mathias C. Ross, Christopher Lietz, William A. Hargus   +3 more
doaj   +1 more source