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   40560篇
  免费   887篇
  国内免费   6篇
  41453篇
  2020年   373篇
  2019年   423篇
  2018年   580篇
  2017年   588篇
  2016年   667篇
  2015年   505篇
  2014年   571篇
  2013年   2703篇
  2012年   1113篇
  2011年   1087篇
  2010年   692篇
  2009年   647篇
  2008年   967篇
  2007年   965篇
  2006年   842篇
  2005年   816篇
  2004年   750篇
  2003年   702篇
  2002年   716篇
  2001年   1283篇
  2000年   1233篇
  1999年   903篇
  1998年   406篇
  1992年   874篇
  1991年   820篇
  1990年   826篇
  1989年   731篇
  1988年   723篇
  1987年   695篇
  1986年   730篇
  1985年   807篇
  1984年   603篇
  1983年   563篇
  1982年   388篇
  1981年   377篇
  1980年   353篇
  1979年   696篇
  1978年   438篇
  1977年   423篇
  1976年   430篇
  1975年   597篇
  1974年   678篇
  1973年   724篇
  1972年   625篇
  1971年   591篇
  1970年   583篇
  1969年   569篇
  1968年   759篇
  1967年   666篇
  1966年   599篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
911.
College student subjects estimated the duration of time intervals (8–54 sec) by counting or not (N=35 per group). Counting eliminated the repetition effect (a decline in the magnitude of estimations across trials), and resulted in a truncation of the psychophysical function. The former result was interpreted as contrary to Treisman's (1963) model. The latter result was attributed to the effortfulness of counting, which was established in a subsequent experiment.  相似文献   
912.
913.
914.
The elements of the Habit Reversal Treatment Package developed by Azrin and Nunn (1973) to counteract nervous habits were systematically analysed. Fifty nail biters (92% reported biting their nails for more than 5 yr) were randomly assigned to one of the following treatments: Habit Reversal, Habit Reversal and Self-Monitoring, Self-Monitoring, Self-Monitoring and Daily Graph Plotting, Waiting List control, Pictures of both hands were taken prior to the commencement of treatment and at 6 and 12 weeks after treatment termination. The results showed that the four treatment groups improved equally compared with the control subjects. Such data cast doubt on the importance of learning an incompatible response in Habit Reversal Treatment. An alternative explanation based on increasing the subject's awareness is put forward.  相似文献   
915.
916.
Pattern reproduction tasks were presented in four different media to samples of urban Zambian and urban British schoolchildren. When the patterns were reproduced as wire models, the Zambian children excelled the British. When the patterns were reproduced by drawing, the British children excelled the Zambian. No reliable cross-cultural differences were found when the patterns were reproduced as plasticine models or as configurations of hand positions. Both cultural groups were equally adversely affected when required to perform the modelling tasks or the hand positions task blind-folded. The results are interpreted as suggesting that cross-cultural differences in performance of pattern reproduction tasks reflect different sets of highly specific perceptual skills rather than differences on broader cognitive variables such as practical intelligence, field-dependency or sensotypes.  相似文献   
917.
Can alcohol reduce tension?   总被引:1,自引:0,他引:1  
The Tension Reduction Hypothesis of alcohol use is examined in the light of recent criticism. Contrary to the conclusions of Cappell and Herman (1972) it is argued that the hypothesis is supported by evidence from animal research in most cases where an appropriate paradigm has been employed.  相似文献   
918.
919.
Intrahypothalamic effects of gonadotropins (luteinizing hormone and follicle-stimulating hormone), thyrotropin-releasing hormone (TRH), and luteinizing-hormone-releasing hormone (LRH) on lordotic behavior were evaluated in ovariectomized (OVX) rats maintained at different receptivity levels. Under conditions of low receptivity in which LRH has been shown to enchance mating behavior, medial preoptic area (MPOA) infusions of luteinizing hormone (LH) caused significant depressions in the lordotic response, whereas LH infusions into the arcuate ventromedial area (ARC-VM) had no sigificant effect. Follicle-stimulating hormone (FSH) infusions into either area did not alter the behavioral response. In the second experiment, in which OVX rats were primed with higher doses of estrone to maintain high ptrinfusion receptivity, MPOA or ARC-VM infusions of either LH or TRH were shown to depress lordotic behavior significantly, whereas neither LRH nor FSH was observed to inhibit the behavioral response. A third experiment evaluated the effects of LH, FSH, and TRH on LRH-facilitated mating behavior. Infusions of LRH into either the MPOA or the ARC-VM significantly enhanced mating behavior, whereas the addition of either TRH or LH to the LRH infusates abolished this response. The addition of FSH to LRH infusates neither enhanced nor depressed the behavioral response to MPOA or ARC-VM infusions of LRH. The antagonistic effects of LH and TRH on LRH-facilitated mating behavior were correlated with previous observations of antagonistic effects on hypothalamic unit activity and monoamine metabolism. The antagonistic interrelation between LRH and LH may represent a mechanism for the activation and coordination of sexual receptivity with ovulation.  相似文献   
920.
The anorexic consequence of thiamin deprivation was investigated in ventromedial hypothalamic (VMH) hyperphagic rats under either high-fat or low-fat thiamin-free diet conditions. The low-fat diet maintained feeding significantly longer in thiamin-deprived VMH rats than in intact rats, whereas the hig-fat diet sustained feeding in thiamin-deficient intact rats and accelerated anorexia onset in vitamin B1 deprived VMH rats. This effect was noted under both ad lib and pair-feeding conditions. Thiamin-deprived VMH rats subjected to weight control developed anorexia sooner than intact subjects regardless of the diet employed. The VMH rats fed a high-fat diet failed to resume feeding after thiamin readministration, which was interpreted as a permanent aversion to this diet. The relation between dietary intake and conditioned taste aversion is discussed with reference to the VMH and intact rat.  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