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几何分布的几个性质
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作者 何朝兵 袁德强 《海南师范大学学报(自然科学版)》 CAS 2012年第1期20-23,共4页
证明了几何分布的顺序统计量的一些性质,有的性质与指数分布相对应的性质有区别但又相似.
关键词 几何分布 顺序统计量 指数分布性
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一种带有多孔隔板设计的SCR混合器研究
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作者 王杰 张强 《机械工程与自动化》 2021年第3期33-34,38,共3页
为满足日益严苛的排放法规要求,对车用柴油机尾气后处理系统提出了更高的尾气处理要求。通过对SCR混合器的孔板位置及大小尺寸进行仿真优化分析,发现左下角开孔面积增大、右上角孔位减少可以有效提高氨分布均匀性。利用计算机辅助模拟... 为满足日益严苛的排放法规要求,对车用柴油机尾气后处理系统提出了更高的尾气处理要求。通过对SCR混合器的孔板位置及大小尺寸进行仿真优化分析,发现左下角开孔面积增大、右上角孔位减少可以有效提高氨分布均匀性。利用计算机辅助模拟的手段对柴油机后处理系统的选择性催化还原氨分布均匀性指数进行了优化,对SCR前端的混合器孔板优化后氨分布均匀性指数≥0.95,较原设计改善了6%,有效提高了SCR的反应效率。 展开更多
关键词 分布均匀指数 SCR 多孔隔板
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Bayesian Prediction of Performance in Clinical Trials
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作者 Hayet Merabet Ahlam Labdaoui 《Journal of Mathematics and System Science》 2013年第7期342-348,共7页
This paper presents one of many possible applications of Bayesian inference predictive context of planned tests. We are particularly interested in the use of predictive Bayesian approach in clinical trials or objectiv... This paper presents one of many possible applications of Bayesian inference predictive context of planned tests. We are particularly interested in the use of predictive Bayesian approach in clinical trials or objective is the development of important evidence of an effect of interest We offer the procedure based on the notion of satisfaction index which is a function of the p-value and we look forward, given the available data to calculate a forecast for future satisfaction data as predictive Bayesian hope this index conditional on previous observations. To illustrate the proposed procedure, several models have been studied by choosing the prior distribution justify the reasons of objectivity or neutrality that underlie the analysis of experimental data. 展开更多
关键词 Bayesian statistics predictive methods clinical trials p-value.
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DEGENERATE SEMI-GROUP METHODS FOR THE EXPONENTIAL STABILITY OF THE FIRST ORDER SINGULAR DISTRIBUTED PARAMETER SYSTEMS 被引量:13
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作者 Zhaoqiang GE Guangtian ZHU Dexing FENG 《Journal of Systems Science & Complexity》 SCIE EI CSCD 2008年第2期260-266,共7页
Exponential stability of the first order singular distributed parameter systems is discussedin the light of degenerate semi-group methods,which is described by the abstract developing equationin Hilbert space.The nece... Exponential stability of the first order singular distributed parameter systems is discussedin the light of degenerate semi-group methods,which is described by the abstract developing equationin Hilbert space.The necessary and sufficient conditions concerning the exponential stability of thefirst order singular distributed parameter systems are given. 展开更多
关键词 Degenerate semi-group exponential stability first order singular distributed parameter systems.
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Mapping paddy rice with multi-date moderate-resolution imaging spectroradiometer (MODIS) data in China 被引量:13
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作者 Hua-sheng SUN Jing-feng HUANG +2 位作者 Alfredo R. HUETE Dai-liang PENG Feng ZHANG 《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 SCIE EI CAS CSCD 2009年第10期1509-1522,共14页
The objective of this study was to obtain spatial distribution maps of paddy rice fields using multi-date moderate-resolution imaging spectroradiometer(MODIS) data in China.Paddy rice fields were extracted by identify... The objective of this study was to obtain spatial distribution maps of paddy rice fields using multi-date moderate-resolution imaging spectroradiometer(MODIS) data in China.Paddy rice fields were extracted by identifying the unique char-acteristic of high soil moisture in the flooding and transplanting period with improved algorithms based on rice growth calendar regionalization.The characteristic could be reflected by the enhanced vegetation index(EVI) and the land surface water index(LSWI) derived from MODIS sensor data.Algorithms for single,early,and late rice identification were obtained from selected typical test sites.The algorithms could not only separate early rice and late rice planted in the same fields,but also reduce the uncertainties.The areal accuracy of the MODIS-derived results was validated by comparison with agricultural statistics,and the spatial matching was examined by ETM+(enhanced thematic mapper plus) images in a test region.Major factors that might cause errors,such as the coarse spatial resolution and noises in the MODIS data,were discussed.Although not suitable for monitoring the inter-annual variations due to some inevitable factors,the MODIS-derived results were useful for obtaining spatial distribution maps of paddy rice on a large scale,and they might provide reference for further studies. 展开更多
关键词 Remote sensing Moderate-resolution imaging spectroradiometer (MODIS) Enhanced vegetation index (EVI) Land surface water index (LSWI) Paddy rice China
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