全文获取类型
收费全文 | 82204篇 |
免费 | 3273篇 |
国内免费 | 46篇 |
专业分类
85523篇 |
出版年
2020年 | 924篇 |
2019年 | 1173篇 |
2018年 | 1634篇 |
2017年 | 1694篇 |
2016年 | 1731篇 |
2015年 | 1197篇 |
2014年 | 1473篇 |
2013年 | 6965篇 |
2012年 | 2610篇 |
2011年 | 2749篇 |
2010年 | 1713篇 |
2009年 | 1672篇 |
2008年 | 2522篇 |
2007年 | 2519篇 |
2006年 | 2214篇 |
2005年 | 2017篇 |
2004年 | 1940篇 |
2003年 | 1776篇 |
2002年 | 1830篇 |
2001年 | 2573篇 |
2000年 | 2451篇 |
1999年 | 1893篇 |
1998年 | 960篇 |
1997年 | 865篇 |
1996年 | 797篇 |
1995年 | 790篇 |
1994年 | 780篇 |
1993年 | 787篇 |
1992年 | 1580篇 |
1991年 | 1443篇 |
1990年 | 1481篇 |
1989年 | 1307篇 |
1988年 | 1302篇 |
1987年 | 1253篇 |
1986年 | 1272篇 |
1985年 | 1293篇 |
1984年 | 1096篇 |
1983年 | 976篇 |
1982年 | 763篇 |
1979年 | 1134篇 |
1978年 | 836篇 |
1975年 | 974篇 |
1974年 | 1028篇 |
1973年 | 1050篇 |
1972年 | 878篇 |
1971年 | 805篇 |
1969年 | 785篇 |
1968年 | 949篇 |
1967年 | 907篇 |
1966年 | 786篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
851.
David E. Sandberg Anke A. Ehrhardt Claude A. Mellins Susan E. Ince Heino F. L. Meyer-Bahlburg 《Sex roles》1987,16(11-12):649-668
The term pioneer is used for girls aspiring to male-dominated careers. This longitudinal study assesses the career choices of 68 middle-class girls during childhood (8–13 years, Phase I) and again during adolescence (13–18 years, Phase II), and investigates the relation between pioneering career choice and personal and family characteristics. Subjects were originally selected for exposure vs nonexposure to exogenous hormones during pregnancy. In childhood, pioneers were somewhat older, were more often persistent tomboys, had higher IQs, and had parents with higher educational attainment. In adolescence, paternal education was the only variable that showed the same relation to career choice. Adolescent girls who had wanted to get married at the time of the childhood assessment were now less likely to choose pioneering careers. Adolescent pioneers also had higher educational aspirations than nonpioneers and less likely anticipated being married within ten years than nonpioneers. A number of statistically borderline relationships were also observed: pioneers had somewhat fewer older brothers than nonpioneers, less often came from homes in which traditional femininity was stressed, and more frequently had mothers who had worked outside the home throughout their daughters' school years than mothers of nonpioneers. Prenatal exposure to exogenous sex hormones was not related to career choice during either childhood or adolescence. 相似文献
852.
SEX DIFFERENCES IN MORAL JUDGMENTS? A TEST OF GILLIGAN'S THEORY 总被引:1,自引:0,他引:1
853.
Sixteen student volunteers were administered a placebo and 50 mg. of chlorpromazine in tablet form, on separate occasions,
two hours before testing. The three tests measured dichotic listening performance, lateral eye movements while answering questions
about spatial location and verbal meaning, and lateralized facial expression while relating pleasant and unpleasant life incidents.
Results showed that chlorpromazine increased the number of trials showing an ear advantage in dichotic listening. Chlorpromazine
reduced lateral and increased vertical eye movements in response to the questions about spatial location and verbal meaning.
Under the placebo both negative and positive emotions were expressed more in the left face. Although chlorpromazine did not
affect this lateralization of negative emotions, the expression of positive emotions occurred equally often on the two sides
of the face under chlorpromazine. Results may be related to an effect of chlorpromazine on the asymmetrical dopamine pathways
of the brain. It is suggested that the findings may be related to a left hemisphere deficit in schizophrenia. 相似文献
854.
855.
856.
S Hesse-Biber A Clayton-Matthews J A Downey 《Genetic, social, and general psychology monographs》1987,113(4):509-528
Among a sample of American college students, body image and the degree of desired weight change were associated with academic self-rankings, with social and psychological well-being, and with the development of eating difficulties. The effects of body image and desired weight change on eating disorders were generally found to be greater for women than for men, and their effects on student self-rankings of academic ability, social, and psychological traits were more pervasive for women than for men. The less attractive a woman perceived herself to be and the more weight she wanted to lose, the greater was her overall sense of academic, social, and psychological impairment. Women who had poor body images and who desired to lose weight were more likely to report eating difficulties. 相似文献
857.
A questionnaire monitoring occupational aspiration, ethnic identification, adolescent experience, and self-esteem was administered to a large sample of Indian and Anglo-Saxon British male and female adolescents attending school in the West Midlands. The relationship between these variables and differences between the four groups were consistent with predictions derived from the social identity approach to intergroup relations and group behaviour (Tajfel & Turner, 1979). Indian males were found to possess a social mobility belief structure that mediates high occupational aspirations and keeness to marry out of their ethnic group. In contrast, Indian females were found to possess a social change belief structure associated with acceptance of the status quo and lower aspirations. Males and Anglo-Saxons reported higher self-esteem than females or Indians. The adolescent experience findings were less clear, but were consistent with the general interpretation of the data that the differences in intersex relations and gender-related experiences are contingent on ethnicity. 相似文献
858.
A suite of programs is described for simulating the Rescorla-Wagner (1972) model of associative learning, the Solomon and Corbit (1974) opponent-process theory, and Schull’s (1979) extension of the latter. The programs are written for the Commodore 64 computer. 相似文献
859.
The objective of this study was to determine what amount of change in heart electrophysiology is necessary to yield a significant difference between a baseline condition and an experimental treatment condition. In a single-subject longitudinal design, a modification of at test was applied to baseline data, and the performance levels for both .05 and .01 probability levels were obtained. It was concluded that it is both ethically sound and physiologically safe to permit a subject in this type of experiment to physiologically respond at levels that would reach both the .05 and the .01 levels of significance. 相似文献
860.
Howard L. Kaplan 《Behavior research methods》1987,19(2):210-214
The Scheduled Measurement System (SMS) is a collection of related programs for administering performance and rating tasks to human subjects. It was designed to provide a common task scheduling and data management environment for a diversity of measures. SMS has greatly reduced the effort required to analyze and archive data after experiments, but it has been less successful in reducing some of the effort required to implement experiments. While programming is not difficult, documentation and user training remain the most primitive parts of the system. 相似文献