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Search Results: 1 - 10 of 222352 matches for " 刘禄勤 "
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 应用概率统计 , 2006, Abstract:
 作者,吕晓星,彭维,刘禄勤 - , 2015, Abstract: 本文由Pareto分布和Logarithmic分布"混合"生成两参数具有单调降失效率的新型寿命分布,研究了该分布的矩、熵、失效率函数、平均剩余寿命和参数的极大似然估计,应用EM算法求参数的极大似然估计,进行了数值模拟.In this paper, we introduce a new two-parameter lifetime distribution with decreasing failure rate. By using mixing Pareto distribution and logarithmic distribution, various properties such as moment, entropy, failure rate function and mean residual lifetime are studied and the MLE of parameters are discussed. The EM algorithm is used to determine the maximum likelihood estimates. Simulation study are performed
 数学物理学报(A辑) , 2008, Abstract: In this paper, one defines the generalized linear models(GLM) based on the observed data with incomplete information and random censorship under the case that regressors are given and regressors are stochastic, respectively. Under the given conditions, one discusses the existence and uniqueness of the solution on the likelihood equations with respect to the parameter vector of the two models, obtains and proves the consistency and asymptoticalnormality of the maximum likelihood estimators(MLE) on the two models, respectively.
 数学物理学报(A辑) , 2007, Abstract: 考虑回归模型: yi=xiβ g(ti) σiei,i=1,2,…,n,其中σi=f(ui),(xi,ti,ui)是固定非随机设计点列, f(·),g(·)是未知函数,β是待估参数,ei是随机误差且关于非降σ-代数列{Fi,i≥1}为鞅差序列.对文献1]给出的基于f(·)及g(·)的一类非参数估计的β的最小二乘估计βn和加权最小二乘估计βn,在适当条件下证明了它们的强相合性,推广了文献6]在ei为iid情形下的结果.
 系统科学与数学 , 2007, Abstract: This paper studies the nonparametric estimates of general weight function of the nonparametric regression function with fixed design points, when the model error is martingale sequence, and we give the optimal convergence rate under some conditions.
 吴传菊,王晓光,何晓霞,刘禄勤 应用概率统计 , 2015, Abstract: 本文考虑一类索赔相依的两险种风险模型,其中两个索赔到达计数过程通过一个Erlang(2)过程部分稀疏相关.通过引入辅助模型,得到破产概率所满足的积分方程,并借助于更新方法讨论其渐进性,最后在索赔额均服从指数分布时给出该模型及辅助模型的生存概率所满足的线性微分方程组及其解法.
 Climate Change Research Letters (CCRL) , 2015, DOI: 10.12677/CCRL.2015.43012 Abstract: 极涡是北极中上层对流层和平流层大气的持续性大尺度气旋性环流。作为重要的极地天气系统，极涡的变化直接影响低层大气环流，从而影响副极地乃至包括我国在内的中纬度地区的天气情况，我国冬季寒潮与极涡活动更是密切相关。因此，极涡的研究对我国冬季天气诊断具有重要意义。本文选取2013年1月、2014年1月的北半球500 hPa高空天气分析图作为主要资料，通过分析、比对两个时期北半球极涡变化情况以及其所对应的我国冬季天气情况，讨论北半球极涡变化对我国冬季寒潮的影响，并得出结论：相对持续而稳定的极涡，其面积与强度通常呈正相关，而在亚洲高纬地区维持一个稳定的极涡系统，对于我国的冬季天气具有良好的指示意义。Polar vortex is a persistent, large-scale cyclone that circles the middle and upper troposphere of arctic and extends into the stratosphere. As an important weather system in polar region, polar vortex has a direct effect on lower atmospheric circulation, thus affecting the weather regimes in the subarctic and middle latitude regions including China. Besides, the cold wave in China is closely related to the variation of polar vortex. Hence, the study on polar vortex exhibits great significance on winter weather analysis domestically. With the arctic meteorological data in the corresponding period of 2013 and 2014, this thesis discusses the influence of arctic polar vortex on cold wave of China through analyzing and comparing the changes in two different time period. It seeks to reach a conclusion that maintaining a stable and persistent polar vortex in high latitude regions of Asia is of great significance to the domestic winter weather condition in that the area and intensity of such polar vortex are generally positively correlated.
 刘承禄 生物化学与生物物理进展 , 1974, Abstract:
 刘桂禄 地球科学进展 , 2006, DOI: 10.11867/j.issn.1001-8166.2006.06.0658 Abstract: 填海造地对深圳市具有深远的可持续发展意义，而增加调蓄水库库容不仅具有现实的经济意义，而且具有巨大的环境和生态意义，扩库填海是满足此两个意义的最优选择。分别从生态、环境、景观、经济、社会、城市供水安全等角度论证了扩库填海的必要性和合理性。
 刘天禄 中国中药杂志 , 1984, Abstract: <正>熟地黄系由生地黄炮制而成,炮制品内心色泽乌黑,并有糖质香气。现将我炮制熟地黄的操作方法简述如下:生地黄纯净后,用铝盆(盆高19cm,口径53cm,底部直径40cm,一次能煮生地黄10公斤)盛之,加水过药面高度,烧木柴武火煮至水沸后,略减火势,保持沸而不溢,随蒸发量频加温水,保持水盖药面。并时用铝铲从盆底部将药物上下翻动。煮10小时,停添柴,不熄火,焖一夜。滤取汁液,将地黄置筐摊晒至六成干,拌入液汁1/3(约700ml,加酒等量共拌)置铝罐中盖严,俟液
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