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   22283篇
  免费   952篇
  国内免费   14篇
  2020年   261篇
  2019年   246篇
  2018年   426篇
  2017年   374篇
  2016年   414篇
  2015年   250篇
  2014年   376篇
  2013年   1619篇
  2012年   656篇
  2011年   711篇
  2010年   372篇
  2009年   473篇
  2008年   619篇
  2007年   622篇
  2006年   563篇
  2005年   504篇
  2004年   484篇
  2003年   479篇
  2002年   430篇
  2001年   808篇
  2000年   804篇
  1999年   593篇
  1998年   246篇
  1997年   222篇
  1993年   204篇
  1992年   492篇
  1991年   430篇
  1990年   491篇
  1989年   411篇
  1988年   392篇
  1987年   371篇
  1986年   394篇
  1985年   449篇
  1984年   345篇
  1983年   292篇
  1982年   234篇
  1979年   331篇
  1978年   266篇
  1977年   208篇
  1976年   204篇
  1975年   303篇
  1974年   352篇
  1973年   354篇
  1972年   278篇
  1971年   243篇
  1970年   209篇
  1969年   228篇
  1968年   289篇
  1967年   251篇
  1966年   273篇
排序方式: 共有10000条查询结果,搜索用时 140 毫秒
991.
Data from 4035 participants in Project TALENT were analyzed to examine the extent to which known sex differences in achievement held up when early potential for achievement was contolled. Original TALENT data, consisting of information on socioeconomic background, cognitive abilities, and educational and occupational aspirations, were collected in 1960 when members of the study sample were in Grade 9. Follow-up surveys measuring participants' educational and occupational attainment were conducted at 1, 5, and 11 years after the date of participants' expected graduation from high school. Women had higher high school grades and scored higher on a composite of academic ability tests taken in Grade 9 than did men. However, by 11 years after high school, men had acquired more education and were earning more money on the job. Sex differences in realization of achievement potential were found across all socioeconomic levels. At least part of the reason behind women's relative failure to translate potential into achievement may lie in the greater conflict, for women, between the roles of spouse/parent and the roles of student/worker: variables measuring the onset, duration, and extent of family-related commitments were more strongly related to female than to male realization of potential. Sex differences in achievement grew larger between the 5- and 11-year follow-ups as a greater proportion of women in the study sample became wives and mothers. The widening of the sex gap in achievement during this period was particularly pronounced among the subgroup of individuals who were in the top quartile of potential in Grade 9.  相似文献   
992.
Stages of career development consistent with age were found in a group of employed managers and professionals. They tended to attribute career success to inherent abilities, education, and developmental experiences in the company studied. Trends among three age groups were similar in regard to factors they perceived as enhancing or adversely affecting their career development.  相似文献   
993.
994.
A cross-cultural examination of the attributions for the life satisfactions of the elderly was conducted by using a sample of 80 Asian-Indian and 80 United States retired citizens. It was hypothesized that factors of hard work, luck, family ties, religious faith, travel and recreation, personal abilities, money, social status, service to others and friendships would account for differences in the attributions for life-satisfactions of the two cultural groups. Results showed that more Asian than United States subjects reported satisfaction with life. Consistent with predictions, the attributions of the Asian group showed religious faith, service to others, family ties and luck as being very important factors contributing to life satisfaction. By contrast, more United States subjects reported that hard work, personal abilities, travel and recreation, and social status had significantly influenced their life satisfactions. Findings were interpreted in terms of cultural and socio-psychological variables which influence the attributions for life satisfactions.  相似文献   
995.
Results of 1,579 observations of cars entering or exiting campus parking lots showed direct relationships between seat belt wearing and the intrusiveness of the engineering device designed to induce belt usage, and between device intrusiveness and system defeat. For example, all drivers with working interlocks or unlimited buzzer reminders were wearing a seat belt; but 62% of the systems with interlocks or unlimited buzzers had been defeated, and only 15.9% of the drivers in these cars were wearing a seat belt. The normative data indicated marked ineffectiveness of the negative reinforcement contingencies implied by current seat belt inducement systems; but suggested that unlimited buzzer systems would be the optimal system currently available if contingencies were developed to discourage the disconnection and circumvention of such systems. Positive reinforcement strategies are discussed that would be quite feasible for large-scale promotion of seat belt usage.  相似文献   
996.
Within the context of a prospective longitudinal research design, the structure of personality and initial levels of drug use were used to predict, multivariately, later drug use among male and female adolescents. The findings indicated that personality and belief measures of nonconventionality provide a significant increment in the prediction of later drug use beyond a level achieved by knowing initial usage rates. In addition, other personality and belief measures yield further increments in the prediction of subsequent drug use. Developmentally, the results revealed a differentiation of drug use patterns across the year's time, with one pattern primarily reflecting alcohol use, and a second pattern primarily reflecting use of marijuana and ‘hard’ drugs. While both patterns were related to measures of nonconventionality, certain personality features distinguished between them. Emergent use of marijuana and ‘hard’ drugs was related to depression, mistrust and attractiveness, while emergent alcohol use was related to generosity, ambition, agility and cheerfulness. These results were cross-validated in two samples of subjects. Implications of the findings for adolescent psychosocial development are discussed.  相似文献   
997.
Left-handers with an inverted handwriting posture have been found by Levy and Reid to have relatively bilateral representation of tachistoscopically tested verbal and spatial functions. On the assumption that such bilateral representation is inefficient, it was hypothesized that left-inverted subjects (N = 20) would score lower than left- and right-handers with normal handwriting postures (Ns = 64, 66 respectively) on spatial reasoning. Results were consistent with the hypothesis. Possible alternative explanations and directions for future research are outlined.  相似文献   
998.
A Role Perception Scale utilizing a combined projective-objective methodology was developed to assess female and male perceptions of each of three single roles — work, marriage, and parent — and two combined roles — work-marriage and work-parent. Research participants were 134 college students, 88 females and 46 males. Factor analysis of the objective scale, the only part to be scored, resulted in two major orthogonal factors labeled role engagement and competition factors. Sex and role differences for each factor were analyzed using 2×5 split block analysis of variance design with repeated measures. On three out of the five single and combined roles women perceived more engagement than men. In general males perceived roles as more competitive. These sex differences and patterns identified in within-sex analyses across roles are discussed.Parts of this paper were presented at the American Psychological Association Convention, Washington, D.C., September 1976. Research was supported in part by the Dean's Development Fund, New York University, School of Education, Health, Nursing, and Arts Professions. Both authors are senior authors. The order of names is randomly determined. The authors wish to thank Philip Merrifield and Barbara Hummel-Rossi for their statistical assistance in data analysis.  相似文献   
999.
Planning: Theoretical considerations and empirical evidence   总被引:1,自引:0,他引:1  
Summary A study of processes rather than of abilities characterizes much of Luria's work on cognitive functions. The three major functional organizations in terms of cognitive functions are: arousal, coding, and planning. Each of these has been described with a special emphasis on planning. Tasks appropriate for demonstrating the processes of planning are discussed and the emergence of a planning factor through factor analytic work has been described. Considerations relating to the independence of planning and coding processes in the context of normal and abnormal development are presented next. Finally, planful behavior as an integral part of purposive behavior in humans is considered in the context of consciousness.  相似文献   
1000.
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