我国C2C市场状况的实证研究   总被引：3，自引：0，他引：3  

周欢怀 《未来与发展》2007,28(11):27-31

本文主要针对CNNC2006年3月对我国C2C市场所作的市场调研报告,分析了我国当前C2C市场的状况和存在问题,并就这些问题提出了解决措施.  相似文献   

中国沙拐枣属新植物   总被引：1，自引：0，他引：1  

毛祖美 《中国科学院研究生院学报》1984,22(2):148-150

  相似文献   

一种图形界面程序的国际化方案     

王瑜  王昕 《中国科技信息》2006,(22):147-147,152

本文介绍了一种将图形界面程序国际化的方案.通过本方案,可以快速地将一个现有程序进行国际化,并且不需要修改程序就可以实现不同语言版本的切换.  相似文献   

论提高中文搜索引擎质量的途径   总被引：11，自引：0，他引：11  

焦微玲 《情报科学》2002,20(1):100-102

随着网络信息数量的迅猛增长，搜索引擎的网络导航作用日益增强，然而搜索引擎自身也存在“信息过载”、“信息超量”的现象，如何克服上述现象，向用户提供数量适宜、质量优良的信息是目前迫切需要解决的问题。本文立足于本文搜索引擎，在分析了我国搜索引擎的发展状况和存在的问题之后，简单论述了可以提高中文搜索引擎质量的几条途径。  相似文献   

基于擦除法的C语言动画设计与实现   总被引：2，自引：1，他引：2  

姜林  何月顺 《科技广场》2005,(2):32-34

本文介绍了程序设计语言中动画设计的原理，在C语言中的动画设计常用方法。并提出了在C语言中新的动画设计方法——擦除法。阐述擦除法动画设计的原理，并通过一个具体的实例详细介绍了这种方法的设计实现，文中末尾总结了擦除法动画设计的优点及适用的范围。  相似文献   

论公元前1600年至前1100年东地中海世界的战争     

郭丹彤 《历史教学(高校版)》2011,(2)

公元前1600—前1100年的古代东地中海世界战争,因决定战争胜败的关键是神的意志,而带有浓厚的宗教色彩。虽然这一时期的战争大都打着弹压叛乱的旗号,但是其本质却是为争夺势力范围的非正义的争霸战争。在频繁且规模宏大的战争中,一些规范各参战国军事行为的战争准则业已形成,从而为通过战争重新构建世界秩序提供了先决条件。纵观古代东地中海世界的战争发展,它大体经历了三个发展阶段,即以争夺生存空间、掠夺财富为目的的原始部落战争,以服人为目的战争和以兼并为目的的战争。公元前1600—前1100年的战争已经发展到以服从为目的的第二阶段。  相似文献   

Economic returns to education: What We Know, What We Don’t Know, and Where We Are Going—Some brief pointers     

Matt Dickson  Colm Harmon 《Economics of Education Review》2011,30(6):1118-1122

The estimation of the economic return to education has perhaps been one of the predominant areas of analysis in applied economics for over 50 years. In this short note we consider some of the recent directions taken by the literature, and also some of the blockages faced by both science and policymakers in pushing forward some key issues. This serves by way of introduction to a set of papers for a special issue of the Economics of Education Review.  相似文献   

Does school time matter?—On the impact of compulsory education age on school dropout     

Sofie J. Cabus  Kristof De Witte 《Economics of Education Review》2011,30(6):1384-1398

A straightforward way to prevent students from leaving education without a higher secondary diploma is increasing the compulsory education age. The idea is that, by staying longer in school, more students eventually obtain a higher secondary diploma. This paper examines the impact of a one-year increase in compulsory school-age on dropping out of secondary education by a difference-in-differences analysis. For this, we exploit a recent compulsory education policy reform in the Netherlands. After controlling for confounding factors and observable covariates, we find that the one year increase in compulsory school-age reduces dropout by 2.5 percentage points. The effect, however, is entirely situated in the group non-liable to the policy reform. We observe that native Dutch vocational students, mostly without retention in grade, but also without a higher secondary diploma at hand, more often left school in the immediate period before the policy reform. Given the economic revival at that time, this may reflect anticipation of labor market opportunities.  相似文献   

Is traditional teaching really all that bad? A within-student between-subject approach     

Guido Schwerdt  Amelie C. Wuppermann 《Economics of Education Review》2011,30(2):365-379

Recent studies conclude that teachers are important for student learning but it remains uncertain what actually determines effective teaching. This study directly peers into the black box of educational production by investigating the relationship between lecture style teaching and student achievement. Based on matched student-teacher data for the US, the estimation strategy exploits between-subject variation to control for unobserved student traits. Results indicate that traditional lecture style teaching is associated with significantly higher student achievement. No support for detrimental effects of lecture style teaching can be found even when evaluating possible selection biases due to unobservable teacher characteristics.  相似文献   

Immigration and student achievement: Evidence from Switzerland     

Muriel Meunier 《Economics of Education Review》2011,30(1):16-38

This paper investigates empirically whether immigrant students in Switzerland perform poorly compared to their native counterparts and provides some explanations. Using a national sample of the 2000 PISA (Programme for International Student Assessment) database, we first analyze the impact of immigrant status on pupils’ achievement. We find a negative and significant impact of immigrant status on test scores in reading, mathematics and science literacy, even after controlling for a set of characteristics. We then decompose the observed reading score gap between Swiss and immigrant students to identify whether gaps in endowments explain test score differences along the distribution. Lower endowments explain most of the achievement gap in reading between Swiss and second-generation immigrants. However, lower returns explain around one quarter of the achievement gap between Swiss and first-generation immigrants for the weakest pupils.  相似文献