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   3483篇
  免费   195篇
  2023年   24篇
  2021年   42篇
  2020年   81篇
  2019年   85篇
  2018年   103篇
  2017年   104篇
  2016年   126篇
  2015年   98篇
  2014年   97篇
  2013年   359篇
  2012年   175篇
  2011年   155篇
  2010年   96篇
  2009年   88篇
  2008年   154篇
  2007年   170篇
  2006年   128篇
  2005年   129篇
  2004年   130篇
  2003年   123篇
  2002年   112篇
  2001年   67篇
  2000年   58篇
  1999年   59篇
  1998年   48篇
  1997年   43篇
  1996年   35篇
  1995年   44篇
  1994年   47篇
  1993年   40篇
  1992年   38篇
  1991年   33篇
  1990年   37篇
  1989年   31篇
  1988年   30篇
  1987年   28篇
  1986年   33篇
  1985年   32篇
  1984年   29篇
  1983年   27篇
  1982年   42篇
  1981年   28篇
  1980年   20篇
  1979年   25篇
  1978年   24篇
  1977年   20篇
  1976年   23篇
  1974年   24篇
  1968年   16篇
  1966年   16篇
排序方式: 共有3678条查询结果,搜索用时 15 毫秒
41.
The stressors of the global COVID-19 pandemic have led to an increased need for support. For adults, romantic relationships often represent an environment of emotional support and stability; as such, attitudes toward—and particularly the importance of—romantic relationships may have shifted as a result of the pandemic. The present cross-sectional study explores how U.S. transgender (n = 99) and cisgender people (n = 1886) report whether they have perceived a change in their feelings about the importance of long-term romantic structures (i.e., committed relationships, monogamy, cohabiting with a romantic partner, and marriage) as a result of the COVID-19 pandemic. Results found that transgender people reported a more positive perceived change in importance placed on all four romantic items relative to cisgender people. Different forms of stress (e.g., social, financial, health) associated with the COVID-19 pandemic may have contributed to an increased need, and subsequent desire, for social connection and support in the form of romantic relationships among transgender individuals to a greater extent than cisgender individuals, perhaps in part due to the additional layers of stress transgender people must navigate. Results are discussed through the lens of the minority stress framework.  相似文献   
42.
43.
The behavior of four monkeys trained on a multiple schedule was differentially sensitive to selected pharmacological agents. The three components of the multiple schedule were: (1) a variable-interval schedule in which responses were reinforced on the average of once per minute; (2) a concurrent schedule in which every tenth response was reinforced and every fifteenth response, on the average, was shocked; and, (3) a neutral stimulus in the presence of which responses were neither reinforced nor shocked. Pentobarbital, chlordiazepoxide, and meprobamate increased responding during each of the components. Scopolamine and d-amphetamine decreased variable-interval performance, had minimal effects on performance during the concurrent-schedule component, and increased responding in the presence of the neutral stimulus. Chlorpromazine decreased variable-interval responding and had slight effects on the responding during the other two components.  相似文献   
44.
45.
The relationship between the occupational preferences of 147 superior students and their fathers' occupations was traced over the 4-year period that the students attended high schools in Wisconsin. Analysis of the data indicated that both male and female superior students tended to state vocational preferences at the professional level early in high school and to maintain this preference throughout. Their occupational preferences were generally at a higher level than those of their fathers. There was no trend away from general preferences for work at a professional level toward naming of specific occupations within that level. The results suggest that theories of vocational development that imply that stages are passed through during later adolescent periods do not apply to the superior student population of this study.  相似文献   
46.
47.
Limited opportunities for training combined with misperceptions about the nature of marital counselling lead to many professionals conducting consultations with couples without training. Where training exists, generally a specific ‘pure’ approach, or a definite brand of eclecticism is taught. The Sheffield Marital and Sexual Difficulties Clinic training course currently aims to give trainees the building blocks for evolving their own brand of eclecticism, or the opportunity to follow a particular approach. Psychodynamic, behavioural and systems theories are highlighted, and the various ways to which these (and other theories) can be used together are examined.  相似文献   
48.
The development of expert and decision support systems requires the collection, organization, codification, and storage of a body of specialized knowledge. The development, using reconstructive methods, of two such knowledge bases, the first containing the current scientific literature and the second containing an expert’s knowledge, is described for an automated decision support system, the Mental Retardation-Expert. This system provides practitioners with assistance in the treatment of aggressive, self-injurious, and destructive behaviors displayed by individuals with mental retardation or developmental disabilities. The average interobserver reliability of the expert knowledge base ranged from 92.5% to 95.0% when calculated across four clinicians’ assessments of 31 abstracted cases.  相似文献   
49.
Direct-observation procedures were used to objectively and efficiently assess several classes of service provided for individuals residing at two state facilities for the developmentally disabled. Time samples were taken of the condition of the clients' physical environment and of the clients themselves. The ongoing behavior of both clients and staff also was recorded. Each residence was observed at least three times during both regular work hours and evening/weekend hours. Results showed that both facilities scored high in the categories regarding the physical condition of the living areas, as well as the categories concerning the condition of the clients. Greater variability was seen in the data on client and staff behavior. More generally, the results indicate that time-sampling procedures can be used efficiently to collect data on multiple aspects of service delivery for large numbers of individuals.  相似文献   
50.
A formal approach to the phenomenon of perceptual grouping by proximity was investigated. Grouping judgments of random dot patterns were made by the CODE algorithm (van Oeffelen & Vos, 1982) and several related algorithms, and these judgments were compared with subjects’ grouping judgments for the same stimuli. Each algorithm predicted significantly more subject judgments than would be expected by chance. The more subjects agreed on how a given dot pattern should be grouped, the more successful was the algorithms’ ability to match the judgments for that pattern. CODE predicted significantly fewer subject judgments than did some of the other algorithms, largely because of its overemphasis on the extent of interactivity among dots as they are being grouped.  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