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   167173篇
  免费   7684篇
  国内免费   156篇
  2021年   1494篇
  2020年   2786篇
  2019年   3461篇
  2018年   3469篇
  2017年   3902篇
  2016年   4632篇
  2015年   3944篇
  2014年   4828篇
  2013年   23574篇
  2012年   4453篇
  2011年   3506篇
  2010年   3869篇
  2009年   4769篇
  2008年   3753篇
  2007年   3315篇
  2006年   3973篇
  2005年   3926篇
  2004年   3454篇
  2003年   3086篇
  2002年   2891篇
  2001年   2894篇
  2000年   2802篇
  1999年   2910篇
  1998年   2826篇
  1997年   2653篇
  1996年   2578篇
  1995年   2413篇
  1994年   2382篇
  1993年   2317篇
  1992年   2384篇
  1991年   2265篇
  1990年   2113篇
  1989年   2040篇
  1988年   2012篇
  1987年   2032篇
  1986年   2020篇
  1985年   2251篇
  1984年   2403篇
  1983年   2231篇
  1982年   2246篇
  1981年   2261篇
  1980年   2114篇
  1979年   2032篇
  1978年   2101篇
  1977年   2073篇
  1976年   1842篇
  1975年   1879篇
  1974年   1912篇
  1973年   1790篇
  1972年   1387篇
排序方式: 共有10000条查询结果,搜索用时 578 毫秒
101.
102.
103.
104.
105.
James Cargile 《Topoi》2003,22(2):143-149
  相似文献   
106.
Previous research demonstrates that older adults are poor at dual tasking, but there is less agreement on whether their decrement is worse than that predicted from single-task performance. This study investigated whether task domain moderates dual-task costs in old age. In two experiments, young and older adults retrieved either previously learned associates (episodic retrieval) or overlearned category members (semantic retrieval) under single or working-memory load conditions, using cued recall (Experiment 1) and recognition (Experiment 2) procedures. In both experiments the proportional costs of dual tasking were age invariant for semantic retrieval but were particularly marked for episodic retrieval, although the size of the age effect was reduced in recognition compared to cued recall. The data suggest that age effects in dual tasking may be domain specific.  相似文献   
107.
108.
109.
Some languages create the impression of being stress timed. Claims have been made that this timing of stressed syllables enables the listener to predict the future locations of informative parts later in a sentence. The fact that phoneme monitoring is delayed when targets in a spoken sentence are displaced has been taken as supporting this claim (Meltzer, Martin, Bergfeld Mills, Imhoff and Zohar, 1976). In the present study temporal displacement was induced without introducing phonetic discontinuities. In Dutch sentences a word just in advance of a target-bearing word was replaced by another one differing in length. Results show that the temporal displacement per se did not have any effect on phoneme-monitoring reaction times. Implications for a theory of fpeech processing are discussed.  相似文献   
110.
The ability of two species of tits to remember the location and/or features of an object was tested in a delayed-matching-to-sample procedure. Three values of retention interval between presentation of the sample stimulus and the choice--30 sec, 5 min, and 15 min--were used. Both species performed at above-chance level at all retention intervals, and there was no significant decline in accuracy with increasing interval. A pool of 100 stimulus objects was used, but the results of control trials indicated that the birds responded primarily to location rather than stimulus features of the object itseif. Although the food-storing marsh tit tended to perform at a higher level than the non-storing great tit, the only significant difference between the species was in the first 50 trials of the first treatment, when the birds were acquiring the task. The results are discussed in relation to the hypothesized special memory capacity of food-storing birds.  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