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   26966篇
  免费   990篇
  国内免费   13篇
  27969篇
  2020年   288篇
  2019年   302篇
  2018年   588篇
  2017年   499篇
  2016年   623篇
  2015年   372篇
  2014年   434篇
  2013年   1751篇
  2012年   929篇
  2011年   991篇
  2010年   416篇
  2009年   489篇
  2008年   660篇
  2007年   660篇
  2006年   626篇
  2005年   1765篇
  2004年   1110篇
  2003年   902篇
  2002年   557篇
  2001年   832篇
  2000年   822篇
  1999年   616篇
  1998年   247篇
  1997年   228篇
  1996年   203篇
  1992年   511篇
  1991年   465篇
  1990年   532篇
  1989年   448篇
  1988年   412篇
  1987年   409篇
  1986年   420篇
  1985年   471篇
  1984年   364篇
  1983年   307篇
  1982年   223篇
  1979年   359篇
  1978年   270篇
  1977年   213篇
  1976年   213篇
  1975年   328篇
  1974年   373篇
  1973年   378篇
  1972年   298篇
  1971年   267篇
  1970年   224篇
  1969年   246篇
  1968年   304篇
  1967年   270篇
  1966年   289篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
971.
972.
973.
Two experiments concerning induced movement are reported. The hypothesis was that when outline inducing frames were used, object-relative displacement was modified by two variables, adjacency and apparent speed. Adjacency is directly related to the magnitude of induced movement. Small outline frames are high in adjacency, and so small frames should be powerful generators of induced movement. On the other hand, several investigators have found the speed of the inducing frame to be inversely related to the magnitude of induced movement. It is hypothesized here that this effect of speed was determined by apparent speed (not real speed), and if so, since small objects appeared to move faster than large ones, a small outline frame should be a relatively weak generator of induced movement. In the first experiment, this hypothesis was tested using single inducing frames. In the second experiment, this hypothesis was tested using two inducing frames presented simultaneously. The implications of these experiments were discussed with regard to other theories of induced movement.  相似文献   
974.
This study investigated leadership selection in groups in relation to level of depression of group members. On the basis of MMPI-D and DACL scores 66 subjects were organized into groups of six to eight people consisting of all depressed, all nondepressed, or half depressed and half nondepressed subjects. Subjects performed a problem solving task alone and in groups and completed a questionnaire on leadership choice and group performance. Results indicate that nondepressed group members talked more frequently, were rated as more important contributors, and were selected as leaders more frequently than depressed members. In addition, mixed groups were perceived as more efficient and enjoyable by group members than the unmixed groups. There were no significant differences between depressed and nondepressed subjects on performance of the problem solving task whether working alone or in groups. Results were discussed in relation to other literature on the interpersonal behavior of depressed persons.  相似文献   
975.
Preschool and many older children often have difficulty understanding who carries out the complement action (e.g., to go in sentences such asMary promised John to go; this is so, even though they easily understand this information in sentences such asJohn told Mary to go. C. Chomsky (1969) proposed that children's errors arise from the overgeneral application of a purely structural Minimal Distance Principle. Maratsos (1974), however, hypothesized that children err by overgeneralizing a different principle which he called the Semantic Role Principle. According to this principle, the Goal-Recipient of the spoken message, not the closest noun phrase, is understood as the person who carries out the act referred to by the infinitival complement. The two studies reported here were designed to determine which of these principles children use. Preschool children were taught to understand a specially designed novel construction. The children then acted out sentences containing related but novel uses of the construction such that they would respond differentially according to which interpretive principle they used. The results strongly favored the Semantic Role Principle, rather than the MDP described by Chomsky (1969), or a related, more complex MDP described by Rosenbaum (1967). It is further discussed how children's formulation of the Semantic Role Principle, rather than the MDP, might arise from their prior analyses of related constructions, such as the imperative construction, rather than following from an innate preference, as suggested in Maratsos (1974).This research was supported by the NICHD under Grant #5 R01 HD09112-02 given to M. P. Maratsos.  相似文献   
976.
Selected aspects of decision making in fertility behavior are reviewed. Attention is directed to assessing motivational determinants, the value of children, the concept of "wantedness," delayed childbearing, and adolescent fertility. A woman's decision to use or not to use a birth control method is heavily influenced by partner interaction. The perception of the partner's attitudes and degree of control in the couple relationship are likely to affect the type of method used, the consistency of contraceptive practice, and the resolution of eventual pregnancies. The present generation in many countries is the 1st to be involved in the conscious process of deciding when and how many children to have and to discontinue contraception. The psychosocial model of fertility behaviour emphasizes the subjective assessment of the environment by the individual and the importance of the 2 partners in a couple influencing each other's perceptions and choice behavior. A key feature of successful couple planning behavior is their joint ability to anticipate future outcomes, plan ahead, and develop contingency alternatives. The history of attempts to explain and delineate motivational determinants of fertility behavior is long and filled with testimonials regarding the complexity of the task. It has been well documented in cross-national studies and commentaries that the pleasures which parents experience in raising their children are highly valued. The gradual transition in the perceived economic value of children probably reflects changing parental attitudes accompanying the secular decline in fertility rates. Reducing the number of unwanted pregnancies has been and continues to be one of the major objectives of international planned parenthood and responsible parenthood movements. No published evidence exists, however, that the unexpected, unplanned, or even unwanted pregnancy is always "bad" or that a planned pregnancy more often produces a psychologically healthy child. To date research has been sparse on the effect of a 1st birth as a conditional factor influencing the number and spacing of subsequent births. Little attention has focused on the process of continuing employment and parenthood. Amid the generally falling birth rates for women under age 20, the number of births to women under age 16 has increased from approximately 25,000 in 1960 to 42,000 in 1977. In the U.S. adolescents bearing children are the least likely to receive adequate prenatal care, are most at risk for having a low birth weight baby, and are more exposed to complications of labor and delivery.  相似文献   
977.
    
This paper concerns the differential effects of use of ‘thematic’, rather than abstract (symbolic), content on the ‘Wason selection task’. An effect of thematic content has been reported several times, originally by Wason & Shapiro (1971), but Manktelow & Evans (1979) report five experiments that failed to obtain an effect and argue against the validity of the content effect in general. However, it is pointed out that four of their experiments use a novel content and that there are previous reports of non-effective content in the literature. It is concluded that a particular type of thematic content cannot be treated as a ‘random sample’ of thematic content in general, and that their argument thus rests upon their failure to produce an effect of the specific (’towns and transport’) content used by Wason and Shapiro. This produces an essentially empirical controversy which is settled in two ways. First, Manktelow and Evans’s criticisms of two previous replications are shown to be misleading. Second, an experiment is reported that exactly copies the Wason and Shapiro design and produces a significant effect of content. It is concluded that the Manktelow and Evans result most probably was due to a Type 2 error. Finally, a hypothesis is developed to account for both the effect of certain types of content and the lack of effect of others, including that used in Manktelow and Evans’s first four experiments.  相似文献   
978.
Eysenck originally postulated that extraverts would adopt tough-minded social attitudes, although psychoticism is now considered to be of greater importance than extraversion. Previous research has attempted to relate psychoticism to realism-idealism, a principal factor of the Wilson-Patterson Conservatism Scale, and a measure of tough-mindedness acceptable to Eysenck. Results have proved discrepant; authors have used psychoticism scales of uncertain item content and length. The present study examines the relationship between psychoticism, extraversion and realism-idealism, using the Eysenck Personality Questionnaire and the Wilson-Patterson Attitude Inventory. The results provide only weak support for Eysenck’s theory. A more significant relationship was obtained between psychoticism and conservatism, and extraversion and conservatism, although a theoretical rationale for these relationships is lacking.  相似文献   
979.
980.
Reviews measurement approaches applied to dream reports and proposes some methodological cautions that may result in more effective utilization of the dream report in research and assessment. Standardization of dream collection techniques and controls for variability in the length of dream reports are suggested. Further investigation of the intraindividual consistency of dream report measures is seen as necessary for a discussion of their validity. Though there are indications that a variety of dream report measures are potentially valid for psychological assessment, measures based on general dream report characteristics show greater promise than specific content analysis. Research on the differences between normal and disturbed subjects highlights the potential, and the problems, inherent in the use of dream reports as tools of psychological inquiry.  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