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   179146篇
  免费   7995篇
  国内免费   157篇
  187298篇
  2020年   2800篇
  2019年   3454篇
  2018年   3534篇
  2017年   3986篇
  2016年   4625篇
  2015年   3932篇
  2014年   4808篇
  2013年   23467篇
  2012年   4663篇
  2011年   3731篇
  2010年   3874篇
  2009年   4764篇
  2008年   3918篇
  2007年   3450篇
  2006年   4063篇
  2005年   4056篇
  2004年   3521篇
  2003年   3152篇
  2002年   2948篇
  2001年   3542篇
  2000年   3393篇
  1999年   3300篇
  1998年   2840篇
  1997年   2673篇
  1996年   2598篇
  1995年   2427篇
  1994年   2392篇
  1993年   2356篇
  1992年   2810篇
  1991年   2642篇
  1990年   2523篇
  1989年   2384篇
  1988年   2349篇
  1987年   2382篇
  1986年   2371篇
  1985年   2629篇
  1984年   2639篇
  1983年   2417篇
  1982年   2401篇
  1981年   2381篇
  1980年   2196篇
  1979年   2366篇
  1978年   2233篇
  1977年   2196篇
  1976年   2017篇
  1975年   2164篇
  1974年   2246篇
  1973年   2153篇
  1972年   1734篇
  1971年   1658篇
排序方式: 共有10000条查询结果,搜索用时 9 毫秒
841.
50 patients suffering from terminal mammary cancer and visceral metastases received chemotherapy, and in addition half of them received psychotherapy, while half did not. A lymphocyte count was undertaken seven times in all, once before initiation of chemotherapy, the others after six applications of the therapy. As hypothesized, the 25 women who received psychotherapy lived longer and had significantly higher lymphocyte counts on Occasions 5, 6 and 7 than did the 25 women who did not receive psychotherapy. Of the types of psychotherapy employed, a specially designed form of behaviour therapy was significantly more helpful than dynamic psychotherapy in prolonging life.  相似文献   
842.
Semantic memory in Alzheimer's disease   总被引:2,自引:0,他引:2  
Patients with Alzheimer's disease have been suggested to have a semantic memory impairment not present in the normal old. This article reviews the performance of Alzheimer patients on tests of various aspects of semantic memory, including word finding, knowledge of the semantic attributes, and associates of concepts, as well as their category membership. The effect that semantic context has on cognitive processes such as lexical and semantic priming and memory encoding is also reviewed. Finally, the ability of theoretical constructs such as implicit memory and automaticity to explain intertask variability in Alzheimer patients' semantic performance is discussed.  相似文献   
843.
This article provides a comprehensive review of the research on smoking and body weight. The relationships between smoking and body weight are evaluated in 70 cross-sectional and longitudinal investigations. The mechanisms responsible for differences in body weight are discussed, the weight-related issues that promote smoking behavior are reviewed, methods for reducing postcessation weight gain are summarized, and future research directions are proposed. A proposed working research model for studying the relationship between smoking, energy balance, and weight gain is offered. It is concluded that smoking and body weight relationships are closely related and pose significant challenges for smoking researchers.  相似文献   
844.
Trace mineral analysis of human hair was utilized to determine whether violent and nonviolent criminals could be differentiated on the basis of concentrations of levels of major and trace minerals. 40 violent and 40 nonviolent inmates from a prison population were selected for study. 27 mineral levels were analyzed and a discriminant function analysis correctly classified 86% of the violent and 78% of the nonviolent inmates. The results lent support to the hypothesis that significantly different levels of trace minerals could be found between the two groups.  相似文献   
845.
12 subjects from an experiment on relaxation therapy for asthma were given the Harvard Group Scale of Hypnotic Susceptibility, Form A. Full scale hypnotic susceptibility scores were positively correlated, at a borderline significance, with improvement in the methacholine challenge test, a measure of asthma severity. Performance on the amnesia item of the Harvard Group Scale was correlated with improvement in self-reported symptoms of asthma.  相似文献   
846.
Specific conceptual factors are presented as having contributed to the negative findings of past psychotherapy bias research. Among these factors are the restrictive nature of both the definition of bias and the model of the biased clinician. A review of published studies of several patient variable biases (e.g., gender, race/ethnicity, and age) indicated that bias may best be defined in broader terms and that its occurrence may be more circumscribed than originally conceived. In addition, the lack of a theoretical perspective in this area of research is noted and the applicability of some social cognitive processes is discussed. Methodological factors are also considered, and recommendations for future research are offered.  相似文献   
847.
The Psychological Record - The present experiments investigated blocking effects in rhesus monkeys (Macaca mulatta) in a discrimination learning paradigm using a single stimulus modality. Two...  相似文献   
848.
Freud's records of his treatment of the Rat Man constitute a unique document in the history of psychoanalysis. Through the years different analysts have used these records to support different theories about analytic technique. Certain non-interpretive interventions of Freud's have especially aroused their interest, and many reasons have been put forward to "explain" Freud's behavior. One reason never yet advanced and documented is that a countertransference tension may have been involved in one of these instances. This is surprising, since countertransference is a necessary part of every analysis. Evidence is presented that Freud's behavior may indeed have been under the sway of countertransference. Some recently discovered details concerning his early life are discussed as constituting a plausible background for ths countertransference enactment.  相似文献   
849.
Reviews     
  相似文献   
850.
Four experiments were conducted to test earlier claims about the relationship between the negative afterimage and the McCollough effect. The first claim (Hansel & Mahmud, 1978) is that long-lasting afterimages occur when induced by the same alternating-stimulus procedure as that used to induce the McCollough effect. The second claim (Murch & Hirsch, 1972) is that afterimages can themselves induce McCollough effects if they are induced and paired sequentially with grating patterns. In testing these claims, a reliable computer-controlled color-cancellation technique developed earlier was used to measure the apparent color of both afterimages and McCollough effects objectively. No support was found for the first claim following alternative presentation of two homogeneously colored regions for total periods of 5 min (Experiment 1) and 20 min (Experiment 2). The second claim was fully supported: After an induction period of 7.3 min, a McCollough effect occurred for a red-vertical pairing but not for a green-horizontal pairing (Experiment 3); but after an induction period of 20 min, McCollough effects occurred strongly for both pairings (Experiment 4). The theoretical implications of these outcomes are considered in the context of recent theories of color and pattern processing in the visual system.  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