汇率变动对农产品进出口的影响

文章运用收支弹性分析法解释了汇率变动如何影响农产品进出口这一现象，分析了近几年我国农产品进出口现状及成因，并指明农产品贸易中容易存在的争端问题及应对措施。     

高校电子文件档案管理的问题与思考

电子文件是以数字设备为生成工具 ,以计算机网络为传递媒介 ,以磁带、磁盘、光盘等为储存载体的新型文件 ,具有传统的纸质文件无法比拟的独特功能。高校作为科学发展的前沿领域 ,电子文件的产生与应用极为广泛 ,因而高校电子文件档案的管理应尽快予以规范 ,使电子文件更好地服务于高校的教学、科研及各项管理工作     

农业信息化"最后一公里"问题探讨

农业信息化“最后一公里”问题是农业部门迫切需要解决的问题,本文在分折我国农村市场信息服务体系的现状的基础上,提出了解决农业信息化“最后一公里”问题的八条对策。     

问题意识、人格特征与教育创新中的创造力培养

教育创新是时代和社会发展对学校教育提出的基本要求。然而,目前的教育现状,一方面是社会对创造性人才的渴求,一方面却是学生提不出问题,缺乏问题意识。本文从心理学的视角阐释了问题意识的概念、影响问题意识的因素、与问题意识相关的人格特征及其相互关系,基于此,我们把教学理念、教学气氛、教学过程作为创造力培养的突破口,即教学理念：从注重“学”转变为关注“问”;教学气氛：激活问题意识,增强学生提出问题的动机;教学过程：培养问题意识,提高提出问题的能力。一句话,创造力培养是教育创新的根本目标。     

假日旅游消费存在的问题及对策

假日旅游以黄金周为单位、采取集中休假的方式拉动了消费，在改变人们休闲观念的同时，也给交通、旅游部门带来了巨大压力，并造成长假前后出现消费萧条等问题。因此，应加强旅游景点的建设与创新，注重差异化的旅游商品开发。此外，政府与社会应相互配合、共同管理，正确引导假日旅游消费。     

A new photonic bandgap cover for a patch antenna with a photonic bandgap substrate

INTRODUCTIONInvestigationofphotonicbandgap(PBG)materialsiscurrentlyoneofthemostactivefron-tiersinengineeringandphysics.PBGmaterialshaverecentlyemergedasanewmultidisciplinaryfieldofstudy(Kesleretal.,1996;Yablonovitch,1994;SimovskiandHe,2001).APBGstructurecanhaveabandgapwithinwhichelectromagnetic(EM)wavepropagationispreventedinalldirec-tions(Joannopoulosetal.,1997;Ozbayetal.,1994).Foratwo-dimensionalPBGmaterial,thepropagationofanEMwavewithinitsbandgapispreventedinalldirectionswithin…     

Fractions as the Coordination of Multiplicatively Related Quantities: A Cross-Sectional Study of Children's Thinking

Although equal sharing problems appear to support the development of fractions as multiplicative structures, very little work has examined how children's informal solutions reflect this possibility. The primary goal of this study was to analyze children's coordination of two quantities (number of people sharing and number of things being shared) in their solutions to equal sharing problems and to see to what extent this coordination was multiplicative. A secondary goal was to document children's solutions for equal sharing problems in which the quantities had a common factor (other than 1). Data consisted of problem-solving interviews with students in 1st, 3rd, 4th, and 5th grades (n=112). We found two major categories of strategies: (a) Parts Quantities strategies and (b) Ratio Quantities strategies. Parts quantities involved children's partitions of continuous units expressed in terms of the number of pieces that would be created. Ratio quantities involved children's creation of associated sets of discrete quantities. Within these strategies, children drew upon a range of relationships among fractions, ratio, multiplication, and division to mentally or physically manipulate quantities of sharers and things to produce exhaustive and equal partitions of the items. Additionally, we observed that problems that included number combinations with common factors elicited a wider range of whole-number knowledge and operations in children's strategies and therefore appeared to support richer interconnections than problems with relatively prime or more basic number combinations.     

互逆代换在恒等变形中的应用

互逆代换在解题过程中尽管仅是在式中加上0或乘以1,但只要运用适当,由此即可克服许多困难,使解题过程大大简化.     

电磁学解题点窍

在电磁学教学中,用具体实例将知识点窍、逻辑推理、解题过程贯穿于整个解题过程中,帮助学生克服解题困惑,提高解题能力.     

我国高等旅游教育存在的问题与对策

中国高等旅游教育已有20多年的发展历程,招生院校和招生人数不断增加,但教育质量却有待提高。本文分析了中国高等旅游教育发展中存在的一些问题,并提出了相应的对策。