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   37447篇
  免费   772篇
  国内免费   2篇
  38221篇
  2021年   118篇
  2020年   244篇
  2019年   276篇
  2018年   3754篇
  2017年   3123篇
  2016年   2613篇
  2015年   516篇
  2014年   447篇
  2013年   2083篇
  2012年   1224篇
  2011年   3051篇
  2010年   2889篇
  2009年   1906篇
  2008年   2313篇
  2007年   2771篇
  2006年   660篇
  2005年   835篇
  2004年   798篇
  2003年   737篇
  2002年   687篇
  2001年   350篇
  2000年   320篇
  1999年   308篇
  1998年   332篇
  1997年   297篇
  1996年   246篇
  1995年   248篇
  1994年   239篇
  1993年   231篇
  1992年   230篇
  1991年   177篇
  1990年   195篇
  1989年   157篇
  1988年   141篇
  1987年   167篇
  1986年   152篇
  1985年   183篇
  1984年   219篇
  1983年   239篇
  1982年   230篇
  1981年   203篇
  1980年   168篇
  1979年   169篇
  1978年   218篇
  1977年   182篇
  1976年   186篇
  1975年   152篇
  1974年   168篇
  1973年   117篇
  1972年   88篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
41.
42.
Native Hawaiian high school students, N = 1779, were surveyed for symptoms of psycho-pathology and suicide attempts in the previous 6 months. Seventy-seven (4.3%) of the students reported making a suicide attempt. There were no significant differences in prevalence rates for males and females. Depression, anxiety, aggression, substance abuse symptoms, and low family support, but not peer support, were significantly correlated with suicide attempts. On logistic regression, depression, substance abuse, and family support independently predicted attempts. The lack of gender difference may indicate a cultural characteristic of the Hawaiian population that differentiates it from mainstream American populations but likens it to the Native American population.  相似文献   
43.
44.
45.
46.
47.
48.
Subjects (N= 28) performing a complex disjunctive concept-formation task on a microcomputer were given the opportunity to seek help following failure to correctly identify concepts. The proportion of those seeking help was significantly greater when the source of help was the computer itself (86%) rather than another person (36%). Consistent with past research, those who did not ask for help gave reasons other than the potential negative social consequences of doing so. Self-report data and a systematic test for the presence of experimenter-induced demand ruled out several possible sources of confounding. The results have implications for designers of time-sharing and networked computer systems.  相似文献   
49.
The individual deciding on a nuclear weapons production policy is faced with a dilemma in which a choice must be made to support one of several conflicting defense policies. In order to investigate the social-psychological variables that are related to armament policy decision making, a telephone survey was conducted in the City of St. Louis, Missouri. Adult subjects (N= 110) responded to questions concerned with cognitive, attitudinal, and emotional responses to nuclear arms. Participants were also asked to choose a weapons production policy for the United States under conditions of continued and decreased Soviet nuclear arms production. Results indicated that respondents decisions about nuclear weapons production were related to their support for deterrence, the availability of their nuclear-related images, their emotional response to nuclear war, their attributions of responsibility for the prevention of nuclear war, and their political party affiliation. Distinctions between antinuclear decision-makers and pronuclear decision-makers are discussed.  相似文献   
50.
Traits and states are concepts that people use to both describe and understand themselves and others. We show that people view these concepts as prototype-based categories that have a graded internal structure and fuzzy boundaries and identify a set of attributes that define the prototypical cores of two categories: traits and states. Prototypical traits are stable, long-lasting, and internally caused. Prototypical states are temporary, brief, and caused by external circumstances. These prototypes are not defined by averages, as the family-resemblance principle would suggest, but by ideal (or extreme) attribute values. Like other ideal-based categories, traits and states serve particular goals. Trait concepts permit people to predict the present from the past; state concepts identify those behaviors that can be controlled by manipulating the situation. These two complementary schemas are part of the extensive theory of psychological causality that is implicit in language. Abstract social concepts differ from object categories in their category standards, the nature of their attributes, and the interrelations among those attributes.  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