中国科学院机构知识库网格系统: 检索

A fourth-order unfitted characteristic finite element method for free-boundary problems 期刊论文 OAI收割
JOURNAL OF COMPUTATIONAL PHYSICS, 2022, 卷号: 469, 页码: 19
作者: Ma, Chuwen; Zheng, Weiying

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收藏 | 浏览/下载：21/0 | 提交时间：2023/02/07

Free-boundary problems Unfitted characteristic finite element methods Convection-diffusion equation Navier-Stokes equations

A FOURTH-ORDER UNFITTED CHARACTERISTIC FINITE ELEMENT METHOD FOR SOLVING THE ADVECTION-DIFFUSION EQUATION ON TIME-VARYING DOMAINS 期刊论文 OAI收割
SIAM JOURNAL ON NUMERICAL ANALYSIS, 2022, 卷号: 60, 期号: 4, 页码: 2203-2224
作者: Ma, Chuwen; Zhang, Qinghai; Zheng, Weiying

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收藏 | 浏览/下载：16/0 | 提交时间：2023/02/07

unfitted characteristic finite element methods time-varying domains moving boundary problems the advection-diffusion equation fourth-order error estimates

Dynamic and asymptotic behavior of singularities of certain weak KAM solutions on the torus 期刊论文 OAI收割
JOURNAL OF DIFFERENTIAL EQUATIONS, 2019, 卷号: 267, 期号: 4, 页码: 2448-2470
作者: Cannarsa, Piermarco; Chen, Qinbo; Cheng, Wei

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收藏 | 浏览/下载：31/0 | 提交时间：2020/01/10

Hamilton-Jacobi equation Weak KAM theory Generalized characteristic Singularities

Erosion on irregular slope surface: A full N-S equation based numerical study 会议论文 OAI收割
Stuttgart, Germany, September 19, 2016 - September 22, 2016
作者: An Y(安翼); Liu QQ(刘青泉)

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收藏 | 浏览/下载：51/0 | 提交时间：2018/11/08

Erosion Landforms Rivers Sedimentation Characteristic length Depth averaged modeling Non uniform velocities Overland flow modeling Saint Venant equation Sediment yields Sheet erosions Slope surfaces

Preventing numerical oscillations in the flux-split based finite difference method for compressible flows with discontinuities, II 期刊论文 OAI收割
INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN FLUIDS, 2016, 卷号: 80, 期号: 5, 页码: 306-316
作者: He ZW; Zhang YS; Li XL(李新亮); Tian BL

收藏 | 浏览/下载：34/0 | 提交时间：2016/03/21

contact discontinuity material interface finite difference method flux vector splitting local characteristic decomposition equation of state WENO

Effects of temperature changes on soil hydraulic properties SCI/SSCI论文 OAI收割
2015
作者: Gao H. B.; Shao, M. G.

收藏 | 浏览/下载：25/0 | 提交时间：2015/12/09

Soil temperature Soil-water characteristic curve Hydraulic conductivity Clay water-retention curves capillary-pressure unsaturated soils dependence conductivity clay equation

Modal characteristics analysis of a doubly clad optical fiber with semi-weakly guiding approximation 期刊论文 OAI收割
optics communications, 2013, 卷号: 294, 页码: 148-155
作者: Tan, Xuefei; Liu, Xianglian; Zhao, Wei; Li, Cheng; Wang, Yishan

收藏 | 浏览/下载：35/0 | 提交时间：2014/09/17

Characteristic equation Modal characteristics Power distributions

Evaluation of the operating range for ground-based infrared imaging tracking system (EI CONFERENCE) 会议论文 OAI收割
International Symposium on Photoelectronic Detection and Imaging 2011: Advances in Infrared Imaging and Applications, May 24, 2011 - May 24, 2011, Beijing, China
作者: Zhang Z.-D.

收藏 | 浏览/下载：50/0 | 提交时间：2013/03/25

Ground-based infrared imaging tracking system (GIITS) is of great importance for aerial target warning and guard. The operating range is one of the key performance specifications on the other which should be calculated calculate the radiation power received on the detector in order to analysis whether the output signal meets the detection requirements or not analyzed and studied during the whole GIITS design process. The operating range is mostly influenced by a few factors without considering the effect of the background radiation. By improving of the traditional method including atmospheric attenuation a new operating range calculation model of the GIITS was established based on two requirements. One is that the image size of observed target should meet the requirement of the processor signal extraction. The number of the pixel occupied by target image should be more than 9. The other is that the signal noise ratio (SNR) of the GIITS should not be less than 5 to meet the requirements of the target detection probability and spatial frequency. The SNR calculation equation in form of energy is deduced and the radiation characteristic of the observed target and background are analyzed. When evaluate the operating range of the GIITS using the new method the performance of GIITS and feature of target and background. This paper firstly makes analysis and summarization on the definite localizations of the traditional operating range equation of the GIITS. The localizations are mainly in two aspects. On one hand we should successively calculate two operating range values according to two requirements mentioned above and choose the minimum value as the analytic result. In the end the dispersion of the image and the effect of image dispersion are not considered in the traditional method an evaluation of operating range for fighter aircraft is accomplished as an example. The influence factors in every aspect on operating range were explored by the calculated result. The new operating range calculation model provides the theoretical basis for the design and applications as well as the comprehensive evaluation of a GIITS. 2011 Copyright Society of Photo-Optical Instrumentation Engineers (SPIE).

Validation of an analytical method for determining soil hydraulic properties of stony soils using experimental data SCI/SSCI论文 OAI收割
2010
Ma D. H.; Shao M. A.; Zhang J. B.; Wang Q. J.

收藏 | 浏览/下载：25/0 | 提交时间：2012/06/08

Stony soils Rock fragment content Soil water characteristic curve Hydraulic conductivity water-retention rock fragments coarse fragments bulk-density infiltration conductivity parameters absorption equation gravels

Experimental research on the rheology characterisic of the red soft rock of badong group 期刊论文 OAI收割
DISASTER ADVANCES, 2010, 卷号: 3, 期号: 4, 页码: 210-213
作者: Shen, Q.; Zhao, Y. Y.; Lu, H. F.; Chen, C. X.

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收藏 | 浏览/下载：24/0 | 提交时间：2018/06/05

red soft rock rheological characteristic constitutive equation