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浏览/检索结果: 共11条，第1-10条 帮助 条数/页： 5101520253035404550556065707580859095100 排序方式： 请选择作者升序作者降序发表日期升序发表日期降序题名升序题名降序提交时间升序提交时间降序 Impacts of integrated meteorological and agricultural drought on global maize yields 期刊论文  OAI收割 AGRICULTURAL WATER MANAGEMENT, 2025, 卷号: 318, 页码: 109727 作者:  Wang, Jiao;  Liu, Wenbin;  Yin, Dongqin   |  收藏  |  浏览/下载：1/0  |  提交时间：2025/11/17 Composite drought indices  Maize meteorological yield  Copula function  Drought impacts   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   |  收藏  |  浏览/下载：48/0  |  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)   |  收藏  |  浏览/下载：149/0  |  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   |  收藏  |  浏览/下载：53/0  |  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：54/0  |  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：37/0  |  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.;  Zhang J.;  Wang J. 收藏  |  浏览/下载：50/0  |  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：65/0  |  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   |  收藏  |  浏览/下载：27/0  |  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：88/0  |  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.