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   2355篇
  免费   249篇
  国内免费   44篇
  2648篇
  2024年   25篇
  2023年   44篇
  2022年   33篇
  2021年   51篇
  2020年   89篇
  2019年   82篇
  2018年   81篇
  2017年   70篇
  2016年   56篇
  2015年   50篇
  2014年   75篇
  2013年   217篇
  2012年   32篇
  2011年   57篇
  2010年   42篇
  2009年   61篇
  2008年   49篇
  2007年   67篇
  2006年   61篇
  2005年   53篇
  2004年   39篇
  2003年   46篇
  2002年   42篇
  2001年   45篇
  2000年   23篇
  1999年   29篇
  1998年   21篇
  1997年   27篇
  1996年   30篇
  1995年   26篇
  1994年   32篇
  1993年   25篇
  1992年   20篇
  1991年   24篇
  1990年   18篇
  1988年   12篇
  1986年   21篇
  1985年   62篇
  1984年   76篇
  1983年   57篇
  1982年   89篇
  1981年   78篇
  1980年   95篇
  1979年   85篇
  1978年   68篇
  1977年   56篇
  1976年   63篇
  1975年   49篇
  1974年   40篇
  1973年   34篇
排序方式: 共有2648条查询结果,搜索用时 15 毫秒
201.
We examined outcomes of a promising 21-session trauma treatment model for children aged 3 to 17 and their caregivers. All children in treatment had experienced at least one traumatic event. The treatment intervention was rooted in theories of trauma and attachment and combines parent training with cognitive behavioral therapy to form a comprehensive trauma treatment program. We report on 27 families who completed the program. Results reflect significant reductions in conduct disorder, problems in social relations, and caregiver depression at an average of a one-year post-treatment follow-up. Results from our preliminary study offer support for further evaluation of the model.  相似文献   
202.
他汀类药物是临床上常用的一种调脂药,现代研究表明它还具有抑制炎症因子的释放及炎症细胞的黏附,调节凝血及纤溶系统,影响单核细胞表面的受体,维护血管内皮功能等,临床研究表明他汀类药物还可以降低脓毒症患者的病死率。本文就他汀类药物在防治脓毒症方面作一综述。  相似文献   
203.
本文回顾性总结历史上几次世界性甲型流感流行和2009年H1N1流感流行情况。概述了2009年H1N1流感普通型病例的临床处理。重点阐述2009年H1N1流感重症型病例的高危人群、发生的危险因素以及临床表现。特别强调重症型流感抗病毒治疗的重要性及适应证。同时提醒关注神经氨酸酶抑制剂应用的耐药问题。  相似文献   
204.
医护人员工作倦怠与A型人格、控制点的关系研究   总被引:49,自引:0,他引:49  
蒋奖  许燕  林丹瑚 《心理科学》2004,27(2):364-366
通过对320名医护人员的调查,探讨工作倦怠与A型人格,控制点之间的关系。结果表明:(1)情绪疲惫、去人性化与A型人格、控制点存在显著正相关,个人成就感与控制点存在显著负相关。(2)A型人格、控制点对情绪疲惫,去人性化具有正向预测作用,控制点对个人成就感具有负向预测作用。(3)与B型人格相比.A型人格者的去人性化程度更高;与内控者相比,外控者工作倦怠程度更高。  相似文献   
205.
Based on Jung's definition of archetype the concept 'archetypal story pattern' is developed as well as a research method drawing on narrative analysis and biographical research to identify these archetypal story patterns in life stories. Jung pointed out that personal myths, archetypal patterns found, e.g., in mythology, can govern the life course of individuals unconsciously. In the Theory of Narrative Identity comparable concepts have been mentioned but were never fully developed. In my research I try to combine Jung's concept of the archetype with the elaborated methodology of narrative analysis. Archetypes can manifest as narratives and the identity construction of a person via narrating the life story can be influenced or even totally structured by archetypal stories which give a specific form as well as a specific meaning to the person's identity. The method of extracting an underlying archetypal pattern from an autobiographical narrative is demonstrated. The results of the research on 20 autobiographical interviews and the inherent archetypal patterns are summarized. The major aim of this paper is to describe in detail the application of a well established method of the social sciences on a key concept of Jungian psychology to show that these concepts can be integrated into recent research frameworks of academic sciences. On the other hand it shows that Jungian concepts can be investigated through established and well defined research methods in empirical research settings.  相似文献   
206.
Instrumental treadle press and nonreinforced key peck responses were monitored during discrimination training and generalization testing in pigeons on positive and negative reinforcement schedules. In Experiment 1, six pigeons pressed a treadle for food on a multiple variable-interval extinction schedule. In Experiment 2, three pigeons pressed a treadle to avoid shock on a multiple free-operant avoidance extinction schedule. Different color keylights signaled S+ and S- components. Some positive behavioral contrast occurred during discrimination training, but the effect was small. Pecking occurred to the S+ keylight in Experiment 1 but not in Experiment 2. On stimulus generalization tests, all subjects displayed a positive peak shift when pressing the treadle for food or to avoid shock. However, peak shift was not found for nonreinforced "autopecks" on the stimulus key, although an area shift was observed in Experiment 1. This is the first demonstration of peak shift for pigeons pressing treadles and the only reliable demonstration of peak shift when negative reinforcement maintained responding. These results, in combination with previous demonstrations of peak shift for rats pressing levers and pigeons pecking keys, indicate that peak shift is a general by-product of operant discrimination learning, since it occurs across a variety of the organisms, responses, and reinforcers.  相似文献   
207.
208.
Following extensive signaled shuttlebox avoidance training, Fischer 344 rats were given extinction trials until they reliably stopped responding and, thereafter, they received occasional classical CS-UCS pairings during the course of restoration test trials in which shock was absent. Experiment I demonstrated that the classical contingency was both necessary and sufficient for the complete recovery of such behavior. Experiment II revealed that the degree of recovery was not differentially affected by the frequency of such CS-UCS pairings. However, in Experiment III recovery in the presence of this contingency was shown to depend on the number of previous extinction trials, although even after a large number of such trials, a considerable degree of recovery occurred. These findings demonstrated the central role of the classical CS-UCS contingency in restoring a previously extinguished avoidance response.  相似文献   
209.
With the component selection measure developed by Hale and Morgan (1973), children's use of selective attention was assessed at six levels of learning, ranging from undertraining to overtraining, and this function was examined at each of ages 4, 8, and 12. It was found that, as the children learned the task, they maintained a relatively wide focus of attention, acquiring information about both features of the stimuli, color and shape. Thus, contrary to the model under investigation, the children did not exercise a high degree of selectivity as they approached mastery of the task; nor did overtraining produce the expected “broadening” of attention, as the children acquired little stimulus information beyond the point at which criterion had been reached. The data were interpreted to be more consistent with a model that assumes the bulk of stimulus learning to occur prior to task mastery.  相似文献   
210.
Squirrel monkeys were trained to respond under a multiple fixed-interval, fixed-interval schedule in which the first response after 5 min terminated a visual stimulus in the presence of which electric shocks could occur. During one component of the schedule, correlated with one color of stimulus lights, every 30th response also produced electric shock; responding was suppressed during this component to approximately 10 to 12% of that occurring in the alternate component in which responding was not punished. In contrast to previous research, morphine (0.03 to 1.0 mg/kg) increased punished responding. Unpunished responding, however, was either not affected or decreased at doses of morphine that increased punished responding. Increases in rate of punished responding also occurred when the single-schedule punishment condition was studied alone in these animals. Subsequent experimentation, which systematically analyzed the development of the rate-enhancing effects of morphine on punished responding, involved the study of drug effects in additional monkeys trained initially under a single-schedule punishment condition. The effects of morphine on punished responding were studied before, after, and then during exposure to the multiple schedule that included a component in which responding was not punished. Increases in response rate with morphine did not occur until it was administered during exposure to the multiple schedule that included a component in which responding was not punished. As with the other monkeys, once the rate increases in punished responding occurred under the multiple schedule, these effects of morphine persisted, even when the multiple schedule was removed.(ABSTRACT TRUNCATED AT 250 WORDS)  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