电气化铁路供电工程建设中存在的问题及相关建议

介绍了我国电气化铁路发展的现状。分析了我国电气化铁路供电工程建设中存在铁路部门与供电部门工作流程衍接不畅、技术观点不统一、供电工程本身缺乏统一的技术体系等问题；指出这些问题是当前影响工程项目顺利开展的主要障碍，并提出了相应建议。     

农业信息化的系统分层和协同整合——以杭州龙井茶为例

现有的农业信息化系统构架是围绕"产-供-销"的供应链模式为主体,相对忽视农业产业化发展的规模化特点以及农业金融化的特征.较为全面解读农业信息化的视角应该立足农业生产的时间和空间特征,贯穿生产加工全过程,体现"服务-生产-服务"的新哑铃型系统分层结构.通过构建不同环节的系统接口,有效对分属不同领域和产业的信息化环节进行有效整合,真正发挥农业生产型服务业的整合效应.本文以杭州龙井茶为例,对上述理论进行了分析.     

Corporate Strategies for Managing Climate Risks

This paper focuses on organizations and their management of climate risks. Climate risks stem from continued changes in climate means and the increase in frequency and intensity of extreme weather events. We ask whether companies also apply the usual process of corporate risk management to climate risks. In seeking to answer this question, we review several literature streams in order to set out an initial theoretical reflection. Based on this we conducted an exploratory case study with 11 electric utilities. Our results illustrate that these companies perceive climatic changes as a material issue for their business. However, management has restricted knowledge about such climatic changes and thus cannot precisely determine the potential negative impacts on business activities. As a consequence, the companies have implemented a climate risk management that does not differ from the usual process of managing other business risks. Our results further illustrate that there is some variation in how individual firms manage climate risks: While risk identification and risk assessment are equally important for all electric utilities, there are differences in how management determines the direction of the individual response to climate risks. Copyright © 2012 John Wiley & Sons, Ltd and ERP Environment.     

基于有效供给视角的我国地理标志管理模式研究

管理模式的选择是地理标志的生存、保护、发展所面临的重大问题。本文首先解析了地理标志概念,并对国际管理模式进行了比较分析。其次,提出当前我国在地理标志管理中存在的弊端。最后,在结合地理标志得到有效供给的前提条件下,提出了构建我国地理标志管理框架的三个层次。     

运用灰色理论对石家庄市农业经济发展的预测

在讨论和分析现状及存在问题的基础上，运用灰色预测理论对石家庄市农业发展进行了预测，目的是为有关部门制定相关政策提供依据。     

A Model of Household Grocery Shopping Behavior

The shopping trip to the grocery store is one of the most basic elements of consumer behavior. The authors seek to provide an understanding of the factors that account for variations in shopping behavior across households. They present a model of shopping behavior that assumes that households seek to minimize the travel cost associated with shopping and the cost of holding goods in inventory. As in the classic EOQ model, observed shopping behavior reflects the manner in which households balance these costs while meeting their consumption needs. A number of propositions derived from the model are tested using data on shopping trips made by households over a one-year period. The results support the model and indicate that the relationship between household characteristics and shopping behavior can be fairly complex: for some households shopping may have a recreational aspect while for others it may compete directly with wage-earning activity.     

Regulation and the Development of Competition in the U.K. Gas Supply Industry

When the U.K. gas supply industry was privatised, it retained its monopoly vertically integrated structure. We discuss the forces which led to the deregulation of the U.K. gas supply industry. Important factors in the process include a number of critical reports by the regulatory authorities, the growth of alternative gas supplies including the development of the spot-market, and the success of independents in gaining market share in markets opened up to competition. We also present surveys of gas users and independent gas suppliers and find that price advantage has been the critical factor in the increase in market share gained by the independent gas suppliers.     

新型农业经营主体的空间分异特征及其创新发展机制——以山东省为例

目的 新型农业经营主体的创新发展是我国实现农业农村现代化发展的重大战略，通过对山东省3类新型农业经营主体发展特征进行研究，有利于以点带面，提升各类新型农业经营主体发展质量。方法 文章以山东省1 585个新型农业经营主体为研究对象，综合运用空间分析方法和地理探测器模型系统揭示山东省3类新型农业经营主体空间分异特征及其创新发展机制。结果 （1）山东省3类经营主体呈集聚型分布，3类经营主体的空间离散程度均处在高非均衡水平，空间分布结构的区域差异明显。（2）3类经营主体呈现“多中心，连片化”的空间分布特征，家庭农场整体呈“带状”分布，农民专业合作社和龙头企业整体呈“环带状”分布。（3）家庭农场与农民专业合作社在县域层面呈显著的空间正相关性，龙头企业在市域层面呈显著的空间负相关性。（4）生产要素、政府能力、劳动力质量、技术创新、产业结构、金融服务、电子商务和市场化水平共同推动各类经营主体创新发展，且两两之间的交互能对3类经营主体创新发展具有协同增强的作用。结论 因此，针对不同类型新型农业经营主体创新发展特性，采取多元化、差异化的发展策略组合有助于推动各类经营主体的创新发展。     

气候变化对粮食产量影响的研究方法综述

[目的]受气候变化的影响,全球粮食安全面临严峻挑战,及时准确地评估气候变化对粮食产量的影响是应对挑战、制定农业适应性对策的关键。相关研究已产生了不少方法,通过综述对方法进行分类,明晰各种方法的优缺点和适用性,以期扬长避短,促进研究方法的综合、发展与完善。[方法]利用文献法、归纳法和比较法,从方法的原理和应用、存在的问题、发展的趋势3个方面进行探讨。[结果]产量分解法可用于分析粮食产量及其构成要素与不同生育期气候变化的关系,实验比较法一般用于粮食产量对单个气候因子或若干气候因子变化的敏感性分析,生产函数法适用于在农业生产系统中分析气候变化对粮食产量影响的边际效应,气候生产潜力模型法侧重于农业生产环境发展评估,作物生长模型法便于结合气候情景预测未来气候变化对粮食产量的影响。在不同研究方向上得以运用的同时,各方法也暴露了一些问题:产量分解法的技术产量难以拟合,实验比较法的数据获取难、模型稳定性较差,生产函数法容易遗漏重要变量、函数构造困难,气候生产潜力模型法的结论难以验证,作物生长模型法参数标定难、模型应用存在尺度错位。[结论]研究方法将逐渐形成一套综合的气候—水文—作物—经济模型法,多源数据融合和多目标模式已经成为方法发展的驱动力。