首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   4125篇
  免费   28篇
  国内免费   13篇
教育   2987篇
科学研究   496篇
各国文化   3篇
体育   214篇
综合类   118篇
文化理论   61篇
信息传播   287篇
  2023年   2篇
  2022年   3篇
  2021年   5篇
  2020年   1篇
  2019年   6篇
  2018年   73篇
  2017年   113篇
  2016年   174篇
  2015年   74篇
  2014年   43篇
  2013年   68篇
  2012年   83篇
  2011年   283篇
  2010年   138篇
  2009年   182篇
  2008年   141篇
  2007年   159篇
  2006年   175篇
  2005年   814篇
  2004年   675篇
  2003年   364篇
  2002年   234篇
  2001年   96篇
  2000年   44篇
  1999年   19篇
  1998年   30篇
  1997年   16篇
  1996年   15篇
  1995年   7篇
  1994年   1篇
  1993年   50篇
  1992年   17篇
  1991年   27篇
  1990年   2篇
  1989年   15篇
  1988年   1篇
  1987年   3篇
  1984年   1篇
  1979年   2篇
  1978年   1篇
  1977年   6篇
  1976年   1篇
  1972年   1篇
  1934年   1篇
排序方式: 共有4166条查询结果,搜索用时 15 毫秒
1.
2.
现代农村服务业是衡量农村社会经济发达程度的重要标志。加快农村服务业发展,是推进农村经济结构调整、转变农村经济发展方式和促进农民就业的有效途径。以浙江省为例,对农村服务业和农民就业问题进行实证研究,在区际差异性分析的基础上,寻求以农民住地就业为主的内部发展方案,具有积极而重要的现实意义,也能对其它区域促进农民就业,实现增收致富,推进“三农”事业和新农村建设发展提供有益借鉴。  相似文献   
3.
用多水平模型对清华大学2001—2006年在全国各地的招生名额分配进行分析,结果显示,六年来在各地的名额分配差异显著,部分省份的名额显著低于全国平均水平,部分省市的名额显著高于全国平均水平。建议对有关高校招生指标在各省的分配情况进行进一步分析。  相似文献   
4.
通过调查发现,四川省少数民族地区(主要是甘孜、阿坝、凉山等地)人才数量少,水平低,结构差,盖源于人才引进机制缺失。应从人才引进机制的配套建设、完善人才交流市场、引人与引智相结合、制定和实施引入人才的具体措施等方面进行解决。  相似文献   
5.
面对新的挑战,高等法律职业教育应当坚持三个面向,肩负起两个使命,努力开辟出一条具有国际视野和中国特色的改革发展之路.形成目标明确、理念先进、制度完善、运行有序、效果明显的高等法律职业教育新格局.  相似文献   
6.
The voucher model of financing schooling is becoming increasingly common throughout Latin America, with at least 12 countries using vouchers or voucher-like schemes. The present study focuses on the voucher models of Colombia and Chile, which have the most extensive programs of this type and those of the longest standing in the region. Using empirical evidence, the author compares the two models along four evaluative dimensions: educational quality, segregation, choice and socialization. After weighing the successes and weaknesses of each system, he concludes that, among other characteristics, the most effective and equitable voucher model features: (a) a flexible interpretation of educational quality; (b) financial grants which target solely the poor; (c) vouchers which cover the entire cost of tuition; (d) open enrolment at participating schools; (e) the participation of both secular and religious private schools; (f) accessible and meaningful information to parents; and (g) strong systems of accountability.  相似文献   
7.
This study examined students alternative conceptions of reptiles and amphibians and the extent to which these conceptions remain intact through the elementary (grades 4 and 6), junior, and senior high school years. We administered multiple-choice and free-response instruments to a total of 513 students and interviewed at least 20 students at each educational level to get an in-depth view of their original conceptions. Then, we developed and administered a two-tier multiple choice diagnostic instrumentto assess various levels of students understanding of amphibians and reptiles(N=1267). The results showed that most students were able to classify snakes as reptiles, whereas fewer than 30% of the students across different ages classified sea turtles as reptiles; the remaining 70% classified sea turtles as amphibians. More students were able to correctly classify frogs as amphibians than toads. In most instances, students correctly classified prototypical representatives of the two animal classes more readily than less exemplary representatives, a finding that supports previous research (Trowbridge, J.E. andMintzes, J.J. (1988). Alternative conceptions in animal classification: A cross-age study. Journal of Research in Science Teaching, 25(7), 547–571). Interestingly, the alternative views of sea turtles as amphibians remained intact throughout the school years. Interview data indicated that students classified sea turtles as amphibians largely because sea turtles are able to live in terrestrial and aquatic habitats. Semantically, amphi means living on land and in water. When asked to distinguish between reptiles and amphibians and to classify several species into those two groups, a wide range of alternative conceptions emerged and the origin of those alternative conceptions are discussed. Similar results were obtained when we applied a two-tier multiple-choice diagnostic instrument to assess students understanding of amphibians and reptiles.  相似文献   
8.
Great efforts have been made to resolve the serious environmental pollution and inevitable declining of energy resources. A review of Chinese fuel reserves and engine technology showed that compressed natural gas (CNG)/diesel dual fuel engine (DFE) was one of the best solutions for the above problems at present. In order to study and improve the emission performance of CNG/diesel DFE, an emission model for DFE based on radial basis function (RBF) neural network was developed which was a black-box input-output training data model not require priori knowledge. The RBF centers and the connected weights could be selected automatically according to the distribution of the training data in input-output space and the given approximating error. Studies showed that the predicted results accorded well with the experimental data over a large range of operating conditions from low load to high load. The developed emissions model based on the RBF neural network could be used to successfully predict and optimize the emissions performance of DFE. And the effect of the DFE main performance parameters, such as rotation speed, load, pilot quantity and injection timing, were also predicted by means of this model. In resume, an emission prediction model for CNG/diesel DFE based on RBF neural network was built for analyzing the effect of the main performance parameters on the CO, NOx emissions of DFE. The predicted results agreed quite well with the traditional emissions model, which indicated that the model had certain application value, although it still has some limitations, because of its high dependence on the quantity of the experimental sample data.  相似文献   
9.
This year, 2016, marks the 150th anniversary of the birth of Beatrix Potter (1866–1943), the much-loved author and illustrator of children’s books. Although translation has made a vital contribution to her international success, Potter’s work remains relatively under-researched from a translation studies perspective. This article aims to provide a clearer picture of Potter’s work in translation over the last hundred years. It identifies early translated editions and discusses Potter’s involvement in their preparation, before examining the appearance of her stories in translation around the world and outlining particular trends in Potter translation. This study is based on extensive research using numerous databases, Potter’s published biographies and correspondence, and on an analysis of the first French editions of her tales. The study reveals that the first published translations of Potter’s works are both of an earlier date and more numerous than is recognised in existing scholarship. It also shows that Potter’s preferred approach in the translation of her stories into French was to adapt the tales to their new French readership, rather than staying close to the originals. Her works are found to have been extensively translated during the last century, especially into European languages, as well as into a significant number of Asian languages. Other matters discussed include the involvement of Potter’s official publisher, Warne, in the publication of international editions; the existence of translations based on American editions with new illustrations; and the posting of online translations by Potter enthusiasts.  相似文献   
10.
Moving ships and other objects drifting on water often impact a bridge's pile foundation. The mechanical model of the piles-bridge structure under horizontal forcing was established, and a time-domain approach based on Finite-difference Method was developed for analyzing the dynamic response of the piles-bridge structure. For a single pile, good agreement between two computed results validated the present approach. The slenderness ratio of the pile, the pile-soil stiffness ratio and the type of the structure influence the dynamic response of the piles-bridge structure. The computed results showed that the stiffness of the structure determines the dynamic response of the piles-bridge structure under horizontal forcing. Project (No. 001110442) supported by the Science and Technology Bureau of Zhejiang Province, China.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号