建筑钢结构的应用发展及综合经济效益分析

简述了建筑钢结构在我国的应用状况 ,介绍了我国发展建筑钢结构的新建筑技术政策 .结合工程实例 ,提出了用综合经济效益取代习惯上采用的用单位面积用钢量来评价建筑结构方案优劣的观点 .指出了当前建筑钢结构发展中存在的一些问题及解决措施 ,并展望了建筑钢结构的发展方向和应用前景     

空调机组节能系统分析

化纤纺织企业中，空调机组的能耗占其总能耗一半以上，对空调机组的合理组合、风机的选型及空调机组调节等方面是进行节能降耗的主要措施，本文即为以上几种节能方式在化纤纺织行业中的分析和评述。     

中国物流产业发展前景与政策

描述了中国物流产业发展的现状和主要特征 ,论述了中国物流产业发展的前景及其对国民经济的贡献 ,提出了促进中国物流发展的政策选择 ,建议政府出台一个鼓励物流产业发展的纲领性文件。     

沈阳市老年人服装态度分析

服装行业一向以中青年群体为重点,然而随着中国全面进入老龄化社会,越来越多的人也开始关注起老年群体。本文就沈阳市老年人服装态度及服装挑选标准进行了调查分析,对服装企业具有一定的参考价值。     

一类瓶颈多选择整数规划问题及其求解

提出了一类瓶颈多选择整数规划问题(BMCIP)并给出了一种有效解法. 在改进的启发式群局部搜索的基础上, 利用分枝剪枝法得到全局最优解. 作为仿真算例, 将ATM网络中虚通道路由规划(VPR)问题转化为此类问题进行求解, 并与传统的搜索算法进行了比较. 结果表明这种算法是快捷而有效的.     

ZDH—30型振动电机式振动混砂机的参数选择与计算

介绍了ZDH-30型振动电机式振动混砂机的结构方案、主要参数的选择与计算方法及机器的主要技术参数。     

加快水电开发是振兴四川经济的战略选择——庆祝《四川水力发电》创刊十周年

本文从振兴四川经济和全国一次能源平衡的战略观点,论述了加快四川水电开发的必要性,同时分析了加快四川水电开发的机遇和条件,最后提出了抓住机遇,不失时机地加快水电开发,带动和促进四川国民经济腾飞的四点主要对策建议.作者突出的提出了冲出去开窗口和引进来出让水电资源结合起来,达到既冲出盆地,又开发自己,发展自己,“打开四门,迎接五洲宾客”的战略思想。     

Willingness-to-pay for reducing fatal accident risk in urban areas: an Internet-based Web page stated preference survey

Contemporary transport project evaluation requires the ability to value reductions in the number of estimated fatal and non-fatal accidents after project implementation. In this quest, we designed a stated preference (SP) experiment to estimate willingness-to-pay (WTP) for reducing fatal accident risk in urban areas. The survey was implemented in a Web page allowing rapid turnover and a complete customisation of the interview. The sample was presented with a series of route choice situations based on travel time, cost and number of car fatal accidents per year. With this data we estimated Multinomial Logit (MNL) and Mixed Logit (ML) models based on a consistent microeconomic framework; the former with linear and non-linear utility specifications and allowing for various stratifications of the data. The more flexible ML models also allow to treat the repeated observations problem common to SP data and, as expected, gave a better fit to the data in all cases. Based on these models, we estimated subjective values of time, that were consistent with previous values obtained in the country, and also sensible values for the WTP for reductions in fatal accident risk. Thus, the Internet appears as a potentially very interesting medium to carry out complex stated choice surveys.     

一个风险敏感最优控制问题的随机最大值原理及在投资选择中的应用

In this paper,we mainly study a kind of risk-sensitive optimal control problem motivated by a kind of portfolio choice problem in certain financial market.Using the classical convex variational technique,we obtain the maximum principle for this kind of problem.The form of the maximum principle is similar to its risk-neutral counterpart.But the adjoint equation and the variational inequality heavily depend on the risk-sensitive parameterγ.This is one of the main difference from the risk-neutral case.We use this result to solve a kind of optimal portfolio choice problem.The optimal portfolio strategy obtained by the Bellman dynamic programming principle is a special case of our result when the investor only invests the home bond and the stock.Computational results and figures explicitly illustrate the relationships between the maximum expected utility and the parameters of the model.     

Food reinforcement and eating: A multilevel analysis.

Eating represents a choice among many alternative behaviors. The purpose of this review is to provide an overview of how food reinforcement and behavioral choice theory are related to eating and to show how this theoretical approach may help organize research on eating from molecular genetics through treatment and prevention of obesity. Special emphasis is placed on how food reinforcement and behavioral choice theory are relevant to understanding excess energy intake and obesity and how they provide a framework for examining factors that may influence eating and are outside of those that may regulate energy homeostasis. Methods to measure food reinforcement are reviewed, along with factors that influence the reinforcing value of eating. Contributions of neuroscience and genetics to the study of food reinforcement are illustrated by using the example of dopamine. Implications of food reinforcement for obesity and positive energy balance are explored, with suggestions for novel approaches to obesity treatment based on the synthesis of behavioral and pharmacological approaches to food reinforcement. (PsycINFO Database Record (c) 2010 APA, all rights reserved)