排序方式: 共有41条查询结果,搜索用时 15 毫秒
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Sun Su-Rong Wang Hai-Xing Zhu Tao Murphy Anthony B. 《Plasma Chemistry and Plasma Processing》2020,40(1):261-282
Plasma Chemistry and Plasma Processing - The diffuse and constricted arc attachment modes to the anode of an argon wall-stabilized transferred arc are investigated using a 2D chemical... 相似文献
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Cheng-Kang Wu · Hai-Xing Wang · Xian Meng · Xi Chen · Wen-Xia PanInstitute of Mechanics Chinese Academy of Sciences Beijing China School of Astronautics Beijing University of Aeronautics Astronautics Beijing China Department of Engineering Mechanics Tsinghua University Beijing China 《Acta Mechanica Sinica》2011,27(2):152-163
The aerodynamic aspects of indirect thrust measurement by the impulse method have been studied both experimentally and numerically. The underlying basic aerodynamic principle is outlined, the phenomena in subsonic, supersonic and arc-heated jets are explored, and factors affecting the accuracy of the method are studied and discussed. Results show that the impulse method is reliable for indirect thrust measurement if certain basic requirements are met, and a simple guideline for its proper application is given. 相似文献
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获得覆盖较宽温度和压力范围内的等离子体输运性质是进行等离子体传热和流动过程数值模拟的必要条件.本文采用Saha方程计算等离子体组分, 采用基于将Chapman-Enskog方法扩展到高阶近似的方法, 计算获得了电子温度(Te)不等于重粒子温度(Th)的情形下, 在300 K到40000 K的温度范围内氦等离子体的黏性、热导率和电导率. 研究结果表明压力和热力学非平衡参数(θ =Te/Th)对氦等离子体的输运性质有较大的影响. 在局域热力学平衡条件下,计算获得的氦等离子体输运性质和文献报道的数据符合良好. 相似文献
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基于科研论文作者的合作方式, 用超图理论构建了一个科研合作超网络演化模型. 利用平均场理论分析了作者发表论文的演化规律, 发现作者的超度 (即发表论文数) 分布符合幂律分布. 进一步理论分析得到分布的幂指数γ与合作领域作者增长速度相关. γ越大, 新作者增长速度越快, 且存在关系: γ=1+L/M (L/M为作者增长率). 并通过对《物理学报》与《中国科学》2003–2012年期间作者发表论文进行了数据分析, 实证结果与理论分析及模拟结果能很好地符合. 本文对科研合作网络的理论和实证研究有一定的借鉴意义.
关键词:
复杂网络
超图
科研合作网络
演化模型 相似文献
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Modeling study is performed to reveal the momentum and heat/mass transfer characteristics of a turbulent or laminar plasma
reactor consisting of an argon plasma jet issuing into ambient air and interacting with a co-axially counter-injected argon
jet. The combined-diffusion-coefficient method and the turbulence-enhanced combined-diffusion-coefficient method are employed
to treat the diffusion of argon in the argon–air mixture for the laminar and the turbulent regimes, respectively. Modeling
results presented include the streamline, isotherm and argon mass fraction distributions for the cases with different jet-inlet
parameters and different distances between the counter-injected jet exit and the plasma torch exit. It is shown that there
exists a quench layer with steep temperature gradients inside the reactor; a great amount of ambient air is always entrained
into the plasma reactor; and the flow direction of the entrained air, the location and shape of the quench layer are dependent
on the momentum flux ratio of the plasma jet to the counter-injected cold gas. Two quite different flow patterns are obtained
at higher and lower momentum flux ratios, and thus there exists a critical momentum flux ratio to separate the different flow
patterns and to obtain the widest quench layer. There exists a high argon concentration or even ‘air-free’ channel along the
reactor axis. No appreciable difference is found between the turbulent and laminar plasma reactors in their overall plasma
parameter distributions and the quench layer locations, but the values of the critical momentum flux ratio are somewhat different. 相似文献
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分析了快递超网络和电子元件超网络的相继故障扩散方式, 结合超图理论提出了2-section 图分析法和线图分析法, 并仿真分析了无标度超网络耦合映像格子的相继故障进程. 结果表明: 无标度超网络对外部攻击表现出了既鲁棒又脆弱的特性. 针对相继故障的不同扩散方式, 无标度超网络的相继故障行为表现出不同的特点. 超网络的相继故障行为和超网络的超度以及超边度分布有密切的联系, 也和超网络中超边的个数有关. 通过和同规模的Barabasi-Albert (BA)无标度网络对比, 在同一种攻击方式下同规模的无标度超网络都比BA 无标度网络表现出了更强的鲁棒性. 另外, 基于超边扩散的相继故障进程比基于节点扩散的相继故障进程更加缓慢. 相似文献
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The title complex [Mn(pht)2(phen)] (Hpht=5,5-diphenylimidazoline-2,4-dione, phen=1,10-phenanthroline) was synthesized and characterized by elemental analysis, IR and X-ray diffraction single-crystal structure analysis. The compound crystallizes in the monoclinic system, space group C2/c with a=2.631 5(16) nm, b=0.924 5(6) nm, c=1.550 8(10) nm, β=116.231(7)°; V=3.384(4) nm3,Mr=737.66, Z=4, F(000)=1 524, Dc=1.448 g·cm-3, μ=0.446 mm-1, the final R=0.069 9 and wR=0.195 3. The complex was valued for its antimicrobial activity against some bacteria in vitro. It was found to be active against the four test bacterial organisms. CCDC: 616309. 相似文献