全文获取类型
收费全文 | 1763篇 |
免费 | 21篇 |
国内免费 | 12篇 |
专业分类
教育 | 948篇 |
科学研究 | 280篇 |
各国文化 | 6篇 |
体育 | 347篇 |
综合类 | 22篇 |
文化理论 | 2篇 |
信息传播 | 191篇 |
出版年
2023年 | 12篇 |
2022年 | 11篇 |
2021年 | 4篇 |
2018年 | 3篇 |
2016年 | 7篇 |
2015年 | 5篇 |
2014年 | 11篇 |
2013年 | 16篇 |
2012年 | 142篇 |
2011年 | 206篇 |
2010年 | 78篇 |
2009年 | 18篇 |
2008年 | 108篇 |
2007年 | 141篇 |
2006年 | 118篇 |
2005年 | 106篇 |
2004年 | 88篇 |
2003年 | 93篇 |
2002年 | 87篇 |
2001年 | 49篇 |
2000年 | 67篇 |
1999年 | 51篇 |
1998年 | 12篇 |
1997年 | 19篇 |
1996年 | 14篇 |
1995年 | 23篇 |
1994年 | 14篇 |
1993年 | 21篇 |
1992年 | 23篇 |
1991年 | 22篇 |
1990年 | 23篇 |
1989年 | 15篇 |
1988年 | 11篇 |
1987年 | 17篇 |
1986年 | 17篇 |
1985年 | 15篇 |
1984年 | 12篇 |
1983年 | 19篇 |
1982年 | 9篇 |
1981年 | 16篇 |
1980年 | 8篇 |
1978年 | 3篇 |
1977年 | 5篇 |
1968年 | 3篇 |
1967年 | 3篇 |
1958年 | 3篇 |
1957年 | 3篇 |
1948年 | 3篇 |
1937年 | 3篇 |
1927年 | 3篇 |
排序方式: 共有1796条查询结果,搜索用时 0 毫秒
61.
Jansen S 《Endeavour》2000,24(1):28-33
During World War I, chemical-warfare practices were introduced into economic entomology in Germany. Fritz Haber, 'the father of chemical warfare', realized that Germany could not win the war and thus looked for 'civilian' uses for his chemical arsenal. Before the war, there was a rhetoric of dangerous 'masses' of insects but the large-scale techniques needed to deal with them had not been developed. The gap between rhetoric and practices enabled entomology to integrate chemical weapons into its working methods. This article traces transformations in the ways of seeing insects and their control from the mid-nineteenth century to after World War I. 相似文献
62.
Clinical psychology has received little attention as a subject in health sciences library collections. This study seeks to demonstrate the relative importance of the monographic literature to clinical psychology through the examination of citations in graduate student theses and dissertations at the Fordham Health Sciences Library, Wright State University. Dissertations and theses were sampled randomly; citations were classified by format, counted, and subjected to statistical analysis. Books and book chapters together account for 35% of the citations in clinical psychology dissertations, 25% in nursing theses, and 8% in biomedical sciences theses and dissertations. Analysis of variance indicates that the citations in dissertations and theses in the three areas differ significantly (F = 162.2 with 2 and 253 degrees of freedom, P = 0.0001). Dissertations and theses in biomedical sciences and nursing theses both cite significantly more journals per book than the dissertations in clinical psychology. These results support the hypothesis that users of clinical psychology literature rely more heavily on books than many other users of a health sciences library. Problems with using citation analyses in a single subject to determine a serials to monographs ratio for a health sciences library are pointed out. 相似文献
63.
64.
ThetoleranceofthemudskipperBoleophthalmusboddaertitocyanideishigherthanthoseofotherfishes[1].Suchahightolerancetocyanidedoesnotinvoveareductionofmetabolicrateoranenhancedanaerobicmetabolism,oracyanide-insensitiverespiratorypathway.Instead,itisaresultofthepresenceofasurplusofcytochromeoxidaseandinduciblecyanide-detoxifyingmechanisms,tumingcyanideinthiocyanate,inthismudskipper[1].ThoughCN-isdetoxifiedtoSCN-,realizingbiomembranesaremorepermeabletoHCNthanCN-,wedecidedtoinvestigateiftheprotondi… 相似文献
65.
66.
67.
68.
Kristensen LB Andersen TB Sørensen H 《Sports biomechanics / International Society of Biomechanics in Sports》2004,3(2):195-208
This study looks at segmental movements in the jumping header from an optimization viewpoint. Investigations on the header so far have focused on head restriction in the movement but have not clarified how and to what extent body segments influence the performance of the skill. In the present study a biomechanical model was used to analyze the jumping header in simulated competition to give a clear picture of an optimized header. Skilled soccer players headed balls at speeds of 13 m x s(-1) the results indicated that the head moves as a free non-restricted segment in the jumping header and should be allowed to do so, even though much soccer literature says otherwise to prevent injuries. The arm movement showed individual characteristics and gave no general advantages in optimizing ball speed after impact in the header The movement of the legs was, on the other hand, the single most important factor in the skill. Therefore, coaches and players shouldfocus on developing muscle strength in the stomach, back and pelvis and should put no restrictions on head and arm movement to optimize the jumping header. 相似文献
69.
70.
A recent meta-analysis performed by Wellman, Cross, and Watson clears the air surrounding young children's performance on tests of false belief by showing that it is highly likely that there is some type of conceptual development between 3 and 5 years of age that supports improved task performance. The data concerning the evolutionary origin of these abilities, however, is considerably less clear. Nonetheless, there is some reason to suspect that theory of mind is unique to our species, and that its original function was to provide a more abstract level of describing ancient behavioral patterns (such as deception, reconciliation, and gaze following)-behaviors that humans share in common with many other species. Thus, the initial selective advantage of theory of mind may have been because it increased the flexibility of already-existing behaviors, not because it generated scores of radically new ones. 相似文献