大体积混凝土的温度监测实例

工程的厚筏板基础为大体积混凝土,施工中通过对混凝土进行温度实时监测,直接观测到了大体积混凝土内部的温度变化过程,反映出控制措施的实际效果,大体积混凝土基础的温差裂缝得到有效控制.     

Consistency of least-squares estimator and its jackknife variance estimator in nonlinear models

The purpose of this paper is twofold: (1) We establish the consistency of the least-squares estimator in a nonlinear modely_i = f(x_i,θ) +σ_ie_i where the range of the parameter θ is noncompact, the regression function is unbounded, and the σ_i,'s are not necessarily equal. This extends the results in Jennrich (1969) and Wu (1981). (2) Under the same model, the jackknife estimator of the asymptotic covariance matrix of the least-squares estimator is shown to be consistent, which provides a theoretical justification of the empirical results in Duncan (1978) and the use of the jackknife method in large-sample inferences.     

Multiple intervention analysis with application to sales promotion data

The sales promotion data resulting from multiple marketing strategies are usually autocorrelated. Consequently, the characteristics of those data sets can be analyzed using time-series and/or intervention analysis. Traditional time-series intervention analysis focuses on the effects of single or few interventions, and forecasts may be obtained as long as the future interventions can be assured. This study is different from traditional approaches, and considers the cases in which multiple interventions and the uncertainty of future interventions exist in the system. In addition, this study utilizes a set of real sales promotion data to demonstrate the effectiveness of the proposed approach.     

安徽省可持续发展综合优势能力分析

从可持续发展研究的系统学方向 ,对可持续发展理论作了简要的解析。借鉴西方经济学中“比较优势理论”的基本思想 ,对区域可持续发展综合优势能力的内涵作了界定 ,并设计了区域综合优势能力的计算方法。进一步制订了安徽省可持续发展综合优势能力的“资产负债表”和“资产负债图”,并对安徽省可持续发展的五大支持系统优势能力及综合优势能力作了深入的分析与评估     

一个地区能源规划模型

本文在综合考虑煤矿、电厂、铁路、输电线路的布局，以及电负荷中心、煤消费中心的分布和能源需求量等多因素复杂关系的基础上，提出了１９９０—２０００年内蒙古东部区能源规划模型。采用线性规划和混合整数规划方法在微型计算机上求解，得出数据结果和结论。     

The effect of risk on the value of lost international business profits

The primary goal for providing damages for loss of business profits to a plaintiff, is to make the plaintiff whole with regards to monetary losses suffered. When the loss of profits results from international operations, the determination of the loss is more complex than from domestic operations, since political and currency risk need to be considered in addition to business risk. When lost profits occur in the future, these need to be discounted to present value. The discount rate used to discount these profits should be adjusted to acount for the risk associated with these future lost profits.     

区域创新系统中的知识流动障碍及其化解

提出了区域创新系统的构成要素和知识流动方式,即区域创新系统内的知识流动方式有4种:企业间的技术合作、研究机构与企业之间的知识流动、技术扩散和人才流动。在此基础上分析了这4种知识流动方式可能存在的障碍,并提出了化解这些障碍的方法。     

专业市场电子商务应用的影响因素分析

我国专业市场的发展对促进中国经济的发展起着举足轻重的作用。目前,中国专业市场发展迅速,但水平较低。对中国专业市场的现状进行分析研究,并在企业电子商务应用的理论基础上,结合专业市场的特点,分析研究了影响专业市场实施电子商务的3个有关问题: 组织、技术和环境,提出了影响专业市场实施电子商务的相关因素。通过设计专业市场调查表, 对成都市金牛区的专业市场进行了实证研究。     

某师范类与理工类院校大学生健康素养比较分析

在《2008 年中国公民健康素养调查问卷》基础上设计大学生健康素养问卷,采用随机整群抽样的方法,对140名师范类大学生和138名理科类大学生进行健康素养调查?师范类院校学生的健康知识与观念素养水平高于理工类院校学生;女生具备的健康素养高于男生?整体上两校健康素养水平不高,应增强学生求知欲,完善健康教育传播方式?     

Marriage patterns and fertility of the world population]

Marriage patterns of the world population may be divided into two major categories; i.e., the traditional marriage pattern, and the European marriage pattern. Characteristics of the traditional marriage pattern are: early marriage, a high percentage of married people, and a low percentage of people who remain single during their lifetime. Characteristics of the European marriage pattern include: late marriage and a higher percentage of females who do not marry in their lifetime. In most parts of Asia and Africa and some Latin American countries, the traditional marriage pattern is dominant, and the birth rate in these countries has remained very high. Most countries in Europe show the characteristics of the European marriage pattern, and the fertility rate in these countries is comparatively low. Some other countries, such as Sri Lanka, are in a process of transformation in their marriage pattern, and their fertility level also shows a transition from a high fertility rate to a lower fertility rate. There is a close relationship between marriage patterns and the level of fertility.