全文获取类型
收费全文 | 2707篇 |
免费 | 45篇 |
国内免费 | 2篇 |
专业分类
教育 | 1840篇 |
科学研究 | 313篇 |
各国文化 | 18篇 |
体育 | 215篇 |
综合类 | 9篇 |
文化理论 | 18篇 |
信息传播 | 341篇 |
出版年
2022年 | 21篇 |
2021年 | 23篇 |
2020年 | 28篇 |
2019年 | 47篇 |
2018年 | 54篇 |
2017年 | 87篇 |
2016年 | 76篇 |
2015年 | 64篇 |
2014年 | 69篇 |
2013年 | 567篇 |
2012年 | 67篇 |
2011年 | 68篇 |
2010年 | 54篇 |
2009年 | 38篇 |
2008年 | 55篇 |
2007年 | 56篇 |
2006年 | 44篇 |
2005年 | 36篇 |
2004年 | 44篇 |
2003年 | 37篇 |
2002年 | 31篇 |
2001年 | 30篇 |
2000年 | 48篇 |
1999年 | 56篇 |
1998年 | 27篇 |
1996年 | 28篇 |
1995年 | 17篇 |
1994年 | 19篇 |
1993年 | 29篇 |
1992年 | 30篇 |
1991年 | 45篇 |
1990年 | 49篇 |
1989年 | 44篇 |
1988年 | 34篇 |
1987年 | 26篇 |
1986年 | 36篇 |
1985年 | 48篇 |
1984年 | 39篇 |
1983年 | 30篇 |
1982年 | 33篇 |
1981年 | 25篇 |
1980年 | 23篇 |
1979年 | 30篇 |
1978年 | 35篇 |
1977年 | 25篇 |
1976年 | 23篇 |
1974年 | 24篇 |
1971年 | 20篇 |
1968年 | 28篇 |
1967年 | 24篇 |
排序方式: 共有2754条查询结果,搜索用时 15 毫秒
1.
Fadhaa A. Ghafil Bassim I. Mohammad Hussain S. Al-Janabi Najah R. Hadi Hayder A. Al-Aubaidy 《Indian journal of clinical biochemistry : IJCB》2021,36(1):81
Genetic variation in the angiotensin II type 1 receptor (AT1R) has an important effect on the outcome of acute coronary syndrome (ACS) initiated treatment with captopril. This study aims to investigate the impact of genetic polymorphism of AT1R (rs5186 and rs275651) on the ACS outcome in Iraqi patients treated with captopril. A total of 250 Iraqi individuals with ACS were included in this case—control study and they were divided into two study groups; Study group 1 included 125 participants who were prescribed captopril, 25 mg twice daily and study group 2 included 125 participants who received no captopril as part of their ACS treatment (control study). The AT1R gene (rs5186) CC genotype was found to be associated with ST-elevation myocardial infarction (STEMI) (Odd’s ratio (O.R) = 1.2, P = 0.7), while AC was associated with Non-ST-elevation myocardial infarction (NSTEMI) and unstable angina (UA) (O.R = 1.2, P = 0.8). AC genotype is more prone to have Percutaneous coronary intervention (PCI) after ACS attack (O.R = 1.2, P = 0.6). CC genotype had a risk to get less improvement (O.R = 1.6, P = 0.5), so might require higher doses of captopril during acute coronary insult. The AT1R gene (rs275651) AA genotype was associated with UA (O.R = 1.3, P = 0.9). AA and AT genotypes were more prone to have PCI after ACS attack (O.R = 3.9 P = 0.2, O.R = 3.5, P = 0.3 respectively) and thus requiring higher doses of captopril. We conclude that the AT1R rs5186, rs275651 genetic polymorphisms might partially affect the clinical outcome of ACS patients treated with captopril and might have captopril resistance which requires higher doses. 相似文献
2.
3.
教练员与运动员关系的研究 总被引:7,自引:0,他引:7
我国竞技体育,教练员与运动员关系好的不乏其人,他们努力训练,通力合作,为我国的竞技体育的腾飞作出了卓越的贡献,但也有些教练员与运动员关系不融洽,使运动员过早地离开运动场,失去了为国争光的机会。文章通过教练员和运动员关系的研究,旨在为提高竞技运动水平和教练员在选材、训练时提供参考。 相似文献
4.
健康作为一种人力资本投资对提高生产力、促进经济发展和个人发展有着重要的作用。它可以提高劳动者的生产效率,刺激教育方面的投资,使人具有更多的时间和能力利用其他资本要素,具有更大的财力(因减少医疗费用)用于其他方面的投资。所以进行人力资本投资时,不可忽视健康这一要素,它也是人力资本形成的重要途径,也对经济增长起着有力的推动作用。 相似文献
5.
Herbert C. Rudman 《Educational Measurement》1993,12(3):5-9
Are two national reports on standardized testing realistic or simplistic? What is the difference between “political” testing and conventional testing? What are some likely consequences of politicizing school testing? 相似文献
6.
7.
The Queen Elisabeth Contest is one of the most prestigious competitions in classical music. For both the artists who participate and for the public, it is important that the ranking of the finalists be affected as little as possible by exogenous factors relating to the organisation of the competition. Still, it is impossible to control for all contingencies. Thus, the ranking can be expected to deviate from that obtained in a hypothetical full-information assessment process. As such, the ranking may be unfair to the candidates and inefficient in providing information to the consumer. Deviations from the full-information ideal may result from self-selection of candidates, from positive information at the margin, and from differences in circumstances. Analysing data on all piano and violin versions of the Contest over the period 1956–1999, we find strong evidence of biases in the rankingprocess. Confirming previous research, we find that musicians who perform later in the final week or later on a given day in this week (on average) obtain a better classification. Further, in the piano competitions women obtain lower rankings and, prior to 1990, finalists from the Soviet Union obtained higherrankings than average. The jury appreciates innovation in the sense that musicians who perform a more recently composed concerto obtain a higher rank. Finally – especiallyfor violin – the candidate's decision to perform a popular concerto leadsto a lower ranking. 相似文献
8.
Cerebral activity, as reflected by power in the alpha waveband (8-13 Hz), was examined prior to the performance of three tasks with different effort and accuracy requirements. The study aimed to further investigate changes in activity observed in an earlier study in which expert karate performers exhibited significant increases in alpha band power during preparation for a training task. In contrast to the earlier research, the high effort task produced a significant decrease in 'alpha' power prior to performance. 'Alpha' power prior to the high accuracy task showed significant differences mediated by the outcome. Successful performance was preceded by higher levels of 'alpha' power than unsuccessful attempts. The reported use of a cognitive strategy on the first task produced a significant difference in activity, lower alpha power being associated with the use of such a technique. 相似文献
9.
10.