中长跑

技术概述而中长跑时,由于有更长的时间实现臂、腿的协调运动,两肩则可轻微摆动,两臂甚至可以摆过胸的中部。当然,也必须避免过大的和过于主动的转动。两肘不要抬得过高并保持在体侧。步长属于个人技术特点,应根据运动员的     

图书定价的经济学分析

运用现代经济学的理论和方法对图书商品的属性进行分析,深入探究其价格形成的内在机制,指出图书商品具有低价格弹性、高收入弹性和正外部性等经济属性;在分析图书市场基本特征的基础上,采用相应的定价模型对图书定价策略进行综合分析;认为图书市场存在一定的垄断性,三级价格歧视和跨期价格递减是图书市场的基本定价机制,图书市场容易出现生产过剩;还论述了欧美国家的图书定价模式及其对我国的借鉴意义。     

Science Letters: On numerical calculation in symplectic approach for elasticity problems

The symplectic approach proposed and developed by Zhong et al. in 1990s for elasticity problems is a rational analytical method, in which ample experience is not needed as in the conventional semi-inverse method. In the symplectic space, elasticity problems can be solved using the method of separation of variables along with the eigenfunction expansion technique, as in traditional Fourier analysis. The eigensolutions include those corresponding to zero and nonzero eigenvalues. The latter group can be further divided into α-and β-sets. This paper reformulates the form of β-set eigensolutions to achieve the stability of numerical calculation, which is very important to obtain accurate results within the symplectic frame. An example is finally given and numerical results are compared and discussed.     

人民币贬值不利于我国外贸企业健康发展──对经济结构改革中我国外贸进出口的分析和预测

本文首先通过对我国出口产品的弹性分析,认为人民币贬值并不能促进我国外贸出口增长,然后对汇率、外贸进出口和经济增长三者之间关系进行研究,认为优化出口产品结构和提高外贸企业自身素质是扩大我国外贸出口的根本途径。最后对下世纪初我国外贸进出口作出展望。     

浅谈土木工程专业中的《弹性力学》课程教学方法

本文从弹性力学教学的目的出发,针对弹性力学课程学时短、理论性强、内容枯燥、学习难度大等问题,探讨了弹力力学的教学方法,提出了课程改革的建议,使教学质量得到进一步提高。     

新“国五条”个税政策对住房市场影响的分析与政策建议

2013年3月1日,国务院颁布了最新的房地产调控政策,简称新"国五条"。其中,对二手房交易从严征收20%的个人所得税的条款是否可以有效控制楼市的投机炒作,进而抑制房价,大家莫衷一是。本文通过税收转嫁分析和博弈考量,分析个税提高可能造成的影响,认为此项政策有其施行的合理性,但也存在与政策制定初衷不符的影响。结合最近出台的地方细则,提出一些政策修改建议。     

Strengthening reinforced concrete beams using prestressed glass fiber-reinforced polymer-Part Ⅰ: Experimental study

This work is aimed at studying the strengthening of reinforced concrete (R. C.) beams using prestressed glass fiber-reinforced polymer (PGFRP). Carbon fiber-reinforced polymer (CFRP) has recently become popular for use as repair or rehabilitation material for deteriorated R. C. structures, but because CFRP material is very stiff, the difference in CFRP sheet and concrete material properties is not favorable for transferring the prestress from CFRP sheets to R. C. members. Glass fiber-reinforced polymer (GFRP) sheets with Modulus of Elasticity quite close to that of concrete was chosen in this study. The load-carrying capacities (ultimate loads) and the deflections of strengthened R. C. beams using GFRP and PGFRP sheets were tested and compared. T- and ⊥-shaped beams were used as the under-strengthened and over-strengthened beams. The GFRP sheets were prestressed to one-half their tensile capacities before being bonded to the T- and l-shaped R. C. beams. The prestressed tension in the PGFRP sheets caused cambers in the R. C. beams without cracks on the tensile faces. The PGFRP sheets also enhanced the load-carrying capacity. The test results indicated that T-shaped beams with GFRP sheets increased in load-carrying capacity by 55% while the same beams with PGFRP sheets could increase load-carrying capacity by 100%. The ⊥-shaped beams with GFRP sheets could increase load-carrying capacity by 97% while the same beams with PGFRP sheets could increase the loading-carrying capacity by 117%. Under the same external loads, beams with GFRP sheets underwent larger deflections than beams with PGFRP sheets. While GFRP sheets strengthen R. C. beams, PGFRP sheets decrease the beams' ductility, especially for the over-strengthened beams (⊥-shaped beams).     

职业教育实行弹性学制的必要性及对策研究

弹性学制在职业教育过程中,可以增强学生的主体意识,充分体现因材施教的原则,有利于学校的管理和发展。可以通过构建模块式课程体系;推行学分制与证书制相结合的教学管理制度;加强考核,严格过程管理的方式在职业学校中实施。     

基于弹性理论——论体育服务产品的供求变化

本文首先对体育服务产品进行界定,然后系统地阐述了在体育服务产品供求变化的过程中,必须借用弹性理论。具体包括需求的价值弹性、交叉弹性和收入弹性,从产品价值、相关产品价格和消费者收入这三个主要要素入手,分析各种要素对产品需求量的影响。     

中国全要素生产率增长的地区差异及阶段划分--基于偏向型技术进步对1978-2013年的测算和分解

基于时变弹性生产函数,当规模报酬不变时,资本产出弹性等于资本收入份额,劳动产出弹性等于劳动收入份额,并将全要素生产率分解为偏向型技术进步和中性技术进步,采用1978—2013年我国东、中、西部的数据进行实证分析。结果表明：1979—2013年各地区全要素生产率在大部分年份呈下降趋势,全要素生产率增长总体上还是以中性技术进步模式为主;1997年前各地区技术进步表现为劳动偏向型,而1997年后表现为资本偏向型;1997年后资本偏向性技术进步对东部地区全要素生产率增长具有促进作用,而对中、西部地区全要素生产率增长具有抑制作用。技术进步偏向直接影响到我国各地区全要素生产率的增长,提高劳动产出弹性、降低资本产出弹性有助于减缓中、西部地区全要素生产率增长速度的下滑,进而促进各地区经济向集约型发展模式转变。