一类无穷积分的变换求值问题     

韩超 《忻州师范学院学报》2007,23(5):1-2,4

应用含参变量积分变换的方法,给出了一类无穷积分的求值公式。  相似文献   

Choquet积分定义的单调集函数的几个遗传性质     

欧阳耀  李军 《东南大学学报》2003,19(4):423-426

讨论了Choquet积分定义的单调集函数的几个遗传性质．证明了Choquet积分定义的新的单调集函数遗传了原来集函数的几个重要的结构特性，如弱零可加性、强序连续性、性质(S)和伪距离生成性质等．最后通过2个例子说明了当被积函数不是C可积时，强序连续性和伪距离生成性质将不再被保留．  相似文献   

Fitting Unstructured Finite Mixture Models in Longitudinal Design: A Recommendation for Model Selection and Estimation of the Number of Classes     

Naoya Todo 《Structural equation modeling》2016,23(5):695-712

In longitudinal design, investigating interindividual differences of intraindividual changes enables researchers to better understand the potential variety of development and growth. Although latent growth curve mixture models have been widely used, unstructured finite mixture models (uFMMs) are also useful as a preliminary tool and are expected to be more robust in identifying classes under the influence of possible model misspecifications, which are very common in actual practice. In this study, large-scale simulations were performed in which various normal uFMMs and nonnormal uFMMs were fit to evaluate their utility and the performance of each model selection procedure for estimating the number of classes in longitudinal designs. Results show that normal uFMMs assuming invariance of variance–covariance structures among classes perform better on average. Among model selection procedures, the Calinski–Harabasz statistic, which has a nonparametric nature, performed better on average than information criteria, including the Bayesian information criterion.  相似文献   

新积分微分方程组的可积类型     

汤光宋  王劲乐 《南阳师范学院学报》2003,2(6):23-31

提出四类积分微分方程组，借助函数迭代法及变上限函数的求导法则，论证其可积性，前三个定理给出求解公式，列举了实例。  相似文献   

圆形镜平面腔数值迭代计算     

陈钢  徐海磊 《实验室研究与探索》2011,30(9):42-45

从菲涅尔-基尔霍夫积分衍射方程出发,推导了圆形镜平面腔所满足的自再现模迭代方程,给出了数值迭代方程的具体形式和TEM00、TEM01、TEM10 3个模式的具体迭代方法。分析计算了3个自再现模的形成过程、单程损耗及相位等特性,并比较了不同菲涅尔数时各模式的本征值和衍射损耗。该方法为研究圆形平面镜谐振腔的激光模式、损耗特性及相位提供了可靠的理论方法,具体的数值迭代方法也可推广应用到其他类型的谐振腔。  相似文献   

基于二进制域上的ECC标量乘法算法     

王平平  陆正福 《六盘水师范高等专科学校学报》2015,(1)

通过分析带符号的二进制算法（NAF)和窗口法的理论基础,利用二进制域上求逆元的简便性,结合预计算倍点序列,提出一种快速计算ECC点倍运算的算法。该算法在求时,采用编码表示,结合NAF编码算法,得到的带符号编码,减少了倍点运算的次数。和同类算法相比,算法能够有效地降低时间复杂度。  相似文献   

Informing in-season tactical periodisation in team sport: development of a match difficulty index for Super Rugby     

Samuel J. Robertson  David G. Joyce 《Journal of sports sciences》2015,33(1):99-107

In team sports, tactical periodisation refers to the planned manipulation of training loads with the aim of prioritising athlete readiness for matches of greatest importance. Although monitoring of athletes’ physical condition is often used to inform this planning, the direct influence of external factors on match difficulty has not been well quantified. In this study, a ‘match difficulty index’ (MDI) for use in Super Rugby was developed, based on the influence imparted by five external factors on previous match outcomes. Specifically, information relating to match location, days break between matches, time-zone change and opposition ladder position (both current and previous year) were collected for matches played during the 2011–2013 Super Rugby seasons. Logistic regression analyses were used to assess the importance of each of these factors with respect to match outcome (win/loss), with opposition ladder position and match location (home, domestic away or international) exerting the greatest influence on match difficulty. Three separate cross-validated models were constructed, with match outcome classification performance reported as 66.2%, 65.5% and 63.7% respectively. The three MDI models emanating from this study can each be used to inform tactical periodisation program design both prior to and during the regular season.  相似文献   

南水北调中线工程水源区生态补偿标准研究——以生态系统服务价值为视角   总被引：5，自引：0，他引：5  

周晨  丁晓辉  李国平  汪海洲 《资源科学》2015,37(4):792-804

生态系统服务价值评估能为确立生态环境保护激励机制和完善流域生态补偿机制提供重要的理论依据与数据支撑。本文基于南水北调中线工程水源区2002-2010年的土地利用变化分析,全面评估了水源区生态系统服务价值及其动态变化情况,据此确立了生态补偿的上限标准和分摊机制,并尝试根据生态服务功能和动态价值变化确立生态补偿支付标准。结果表明:南水北调中线工程水源区2010年生态系统服务总价值为2 724.56亿元,比2002年减少了125.38亿元;南水北调中线工程受水区生态补偿上限标准为46.12亿元/a,其中中央政府为18.45亿元/a,受水区地方政府为27.67亿元/a;生态补偿支付标准中央政府为7.1亿元/a,河南、河北、天津和北京分别为4.26亿元/a、3.93亿元/a、1.12亿元/a和1.34亿元/a。本文最后建议改革现有南水北调工程水价机制,继续加大生态补偿中央纵向转移支付,逐步建立生态补偿横向转移支付机制。  相似文献   

Schwarz积分不等式在二元函数中的推广及应用     

姚晓洁 《柳州师专学报》2015,(3):113-119

Schwarz积分不等式是一个重要的不等式,它在自然科学的理论研究以及实际应用中用途广泛.本文将Schwarz积分不等式推广到二元函数中,并给出一些应用.  相似文献   

浅谈高等数学与工程数学的区别与联系     

刘令  沈海莹  谢嘉宁 《读与写:教育教学刊》2015,(1)

本文通过概述高等数学和工程数学的相关内容,阐述了二者在实际应用中的重要性,并通过简单的例子来说明二者的区别与联系,进一步证明了二者存在的意义。  相似文献