中国科学院机构知识库网格系统: 检索

Subspace tracking method for non-smooth yield surface 期刊论文 OAI收割
COMPUTERS & MATHEMATICS WITH APPLICATIONS, 2021, 卷号: 90, 页码: 125-134
作者: Li, Chunguang; Li, Cuihua; Zheng, Hong

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收藏 | 浏览/下载：26/0 | 提交时间：2021/06/18

Elastoplasticity Non-smooth yield surface Subspace tracking method Complementarity function Mohr-Coulomb

Hierarchical-microstructure based modeling for plastic deformation of partial recrystallized copper 期刊论文 OAI收割
MECHANICS OF MATERIALS, 2019, 卷号: 139, 页码: UNSP 103207
作者: Liu Y(刘瑶); Cai SL(蔡松林); Su MY(苏明耀); Wang YJ(王云江); Dai LH(戴兰宏)

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收藏 | 浏览/下载：127/0 | 提交时间：2019/12/17

Hierarchical microstructure Yield function Partial recrystallization Metallic material Mechanical property

Establishment and application of spring maize yield to evapotranspiration boundary function in the Loess Plateau of China 期刊论文 OAI收割
AGRICULTURAL WATER MANAGEMENT, 2016, 卷号: 178, 页码: 345-349
作者: Lin, Wen; Liu, Wenzhao

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收藏 | 浏览/下载：35/0 | 提交时间：2019/09/26

Water-limited yield potential Boundary function Quantile regression Plastic film mulching

A hierarchical multi-scale model for hexagonal materials taking into account texture evolution during forming simulation 期刊论文 OAI收割
Computational Materials Science, 2014, 卷号: 82, 页码: 464-475
W. J. He; S. H. Zhang; A. Prakash; D. Helm

收藏 | 浏览/下载：44/0 | 提交时间：2014/02/19

Hexagonal materials Texture evolution Non-orthotropic yield function Hierarchical multi-scale model Embedded model Visco-plastic self-consistent scheme self-consistent approach finite-element analysis magnesium alloy az31 mechanical response titanium-alloys crystallographic texture aerospace industry plastic anisotropy zirconium alloys yield criterion

Surface shape optimization for the space membrane reflector (EI CONFERENCE) 会议论文 OAI收割
2011 International Conference on Electronic and Mechanical Engineering and Information Technology, EMEIT 2011, August 12, 2011 - August 14, 2011, Harbin, China
作者: Zhang Y.; Zhang P.

收藏 | 浏览/下载：26/0 | 提交时间：2013/03/25

Space membrane reflector is very promised for optical quality application with the merits of ultra-lightweight and flexible. In order to improve the surface precision of membrane reflectors the formation and surface shape error of a membrane at uniform load are studied based on the henky-cambell equations of circular membrane. The ANSYS software is used to build an optimization model of membrane reflector surface shape in which the yield strength is the state variable the surface load on ten concentric annular regions of the mirror is the design variable and the minimum RMS between ideal surface and mirror surface is the target function. and the theoretical and experimental result show that RMS and PV of the optimized surfaces are reduced respectively than those before optimization. In a word this paper offers the theoretical and experimental basis of the polyimide membrane reflector. 2011 IEEE.

Modulation transfer function measurement of sampled imaging systems in field test (EI CONFERENCE) 会议论文 OAI收割
5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, April 26, 2010 - April 29, 2010, Dalian, China
作者: Yang L.; Zhang J.; Zhang J.

收藏 | 浏览/下载：34/0 | 提交时间：2013/03/25

A digital mirror device (DMD) based light projector was developed as the target generator in modulation transfer function (MTF) measurement. In order to overcome the sampling-scene phase effect in MTF measurement of sampled imaging systems a method using random targets is introduced to yield a phase-averaged MTF. The main potential problem of implementing this method is the fact that the stationary assumption of the random targets may be vitiated in practical measurement especially in field test due to the ill condition. We provide an efficient model-independent way of analyzing and isolating the spectral contents arising from these additional contributions to MTF measurement. Algorithms with adaptive parameter selection were also developed for spectral estimation of the test image in order to overcome the challenge brought by the size limit of the test matrices for one certain field of view derived from the isoplantic region. The MTF measurement of a CCD video imager is used to demonstrate the measurement technique and illustrate the benefits over other methods. In order to validate the results comparisons have been made between MTF measurements of imager implemented using this method and bar target direct measurements. 2010 Copyright SPIE - The International Society for Optical Engineering.

Yield criterion and elasto-plastic damage constitutive model for frozen sandy soil 期刊论文 iSwitch采集
INTERNATIONAL JOURNAL OF PLASTICITY, 2009, 卷号: 25, 期号: 6, 页码: 1177-1205
作者: Lai Yuanming; Jin Long; Chang Xiaoxiao

收藏 | 浏览/下载：46/0 | 提交时间：2019/10/08

Frozen sandy soil Pressure melting Yield function Cross anisotropic damage Elasto-plastic damage constitutive model

FEA OF EVALUATING MATERIAL YIELD STRENGTH AND STRAIN HARDENING EXPONENT USING A SPHERICAL INDENTATION 期刊论文 OAI收割
ACTA METALLURGICA SINICA, 2009, 卷号: 45, 期号: 2, 页码: 189-194
作者: Cui Hang; Chen Huaining; Chen Jing; Huang Chunling; Wu Changzhong

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收藏 | 浏览/下载：11/0 | 提交时间：2021/02/02

FEA (finite element analysis) spherical indentation yield strength strain hardening exponent dimensionless function

A MLP-PNN neural network for CCD image super-resolution in wavelet packet domain (EI CONFERENCE) 会议论文 OAI收割
2008 International Conference on Wireless Communications, Networking and Mobile Computing, WiCOM 2008, October 12, 2008 - October 14, 2008, Dalian, China
Zhao X.; Fu D.; Zhai L.

收藏 | 浏览/下载：70/0 | 提交时间：2013/03/25

Image super-resolution methods process an input image sequence of a scene to obtain a still image with increased resolution. Classical approaches to this problem involve complex iterative minimization procedures typically with high computational costs. In this paper is proposed a novel algorithm for super-resolution that enables a substantial decrease in computer load. First decompose and reconstruct the image by wavelet packet. Before constructing the image use neural network in place of other rebuilding method to reconstruct the coefficients in the wavelet packet domain. Second probabilistic neural network architecture is used to perform a scattered-point interpolation of the image sequence data in the wavelet packet domain. The network kernel function is optimally determined for this problem by a MLP-PNN (Multi Layer Perceptron - Probabilistic Neural Network) trained on synthetic data. Network parameters dependent on the sequence noise level. This super-sampled image is spatially Altered to correct finite pixel size effects to yield the final high-resolution estimate. This method can decrease the calculation cost and get perfect PSNR. Results are presented showing the quality of the proposed method. 2008 IEEE.

Improved best tradeoff for high-resolution image fusion based on spectral reflection function 会议论文 OAI收割
International Conference on Earth Observation Data Processing and Analysis, ICEODPA,, Wuhan, China, December 28, 2008 - December 30,2008
Wang, Zhongwu; Zhao, Zhongming

收藏 | 浏览/下载：29/0 | 提交时间：2014/12/07

This paper extended the best tradeoff fast intensity-hue-saturation (BTFIHS) fusion to a more general model. Firstly based-on the methods proposed by previous researches we integrated injecting strategy of spatial detail information into the fusion model and also adopted the idea of BTFIHS to keep the intensity unchanged with the corresponding pixel in panchromatic (PAN) image while the hue and saturation of every pixel using BTFIHS were equal to them using tradeoff fast intensity-hue-saturation (TFIHS). Then we got a general formula of the improved best tradeoff for high-resolution image fusion based-on getting injecting parameter by spectral reflection function (SRF). At last several experiments were carried on to analysis and discuss the quality of the new methods compared with their originals. Results show that the new method could yield a "true" high-resolution multispectral (MS) image with vast improvement in blue band and nearly 3.3% improvement in Q4 for all bands. 2008 SPIE.