全文获取类型
收费全文 | 90066篇 |
免费 | 1320篇 |
国内免费 | 7篇 |
专业分类
91393篇 |
出版年
2020年 | 952篇 |
2019年 | 1139篇 |
2018年 | 4432篇 |
2017年 | 3755篇 |
2016年 | 3572篇 |
2015年 | 1330篇 |
2014年 | 1298篇 |
2013年 | 5830篇 |
2012年 | 2626篇 |
2011年 | 4454篇 |
2010年 | 3618篇 |
2009年 | 2718篇 |
2008年 | 3598篇 |
2007年 | 3947篇 |
2006年 | 1861篇 |
2005年 | 1877篇 |
2004年 | 1764篇 |
2003年 | 1615篇 |
2002年 | 1563篇 |
2001年 | 2333篇 |
2000年 | 2267篇 |
1999年 | 1709篇 |
1998年 | 890篇 |
1997年 | 763篇 |
1996年 | 692篇 |
1995年 | 673篇 |
1994年 | 640篇 |
1993年 | 676篇 |
1992年 | 1370篇 |
1991年 | 1282篇 |
1990年 | 1298篇 |
1989年 | 1158篇 |
1988年 | 1100篇 |
1987年 | 1078篇 |
1986年 | 1100篇 |
1985年 | 1205篇 |
1984年 | 933篇 |
1983年 | 823篇 |
1982年 | 664篇 |
1979年 | 932篇 |
1978年 | 708篇 |
1975年 | 834篇 |
1974年 | 912篇 |
1973年 | 896篇 |
1972年 | 757篇 |
1971年 | 682篇 |
1969年 | 635篇 |
1968年 | 793篇 |
1967年 | 756篇 |
1966年 | 717篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
871.
R. Grossarth-Maticek H.J. Eysenck A. Pfeifer P. Schmidt G. Koppel 《Personality and individual differences》1997,23(6):949-960
We report the results of a prospective study of a random sample of 1353 elderly but healthy men and women who were followed up for a period of 10 yr, when mortality and cause of death were ascertained. Overall results have been reported elsewhere for mortality from cancer, coronary heart disease and other causes; here we are concerned with the personality factors predicting breast cancer, cervical cancer, cancer of the corpus uteri specifically, as well as other types of cancer in women. Ten specific hypotheses were tested, using specially constructed questionnaires for the purpose, and for most of these statistically significant support was obtained. The results justify belief that specific types of cancer may be related to specific stress/personality factors. 相似文献
872.
873.
Two experiments addressed whether response latency in a trial of the lexical decision task is independent of the lexical status of the item presented in the previous trial. In Exp. 1, it was found that both word and nonword responses were significantly slower when the previous trial had involved a nonword than when it had involved a word. In Exp. 2, which employed a different list composition, it was found that responses to nonwords and pseudohomophones were significantly slower when the previous trial had involved a nonword or a pseudohomophone than when it had involved a word. However, responses to words were not influenced by the nature of the previous trial. We concluded that sequential dependencies exist across consecutive trials in the lexical decision task even when there is no semantic, morphological, phonological, or orthographic relationship between the items presented during those trials. 相似文献
874.
A person-perception study was conducted to examine the influence of intimacy and commitment on the acceptability of premarital sex and contraceptive preparedness. Ninety-six women rated a female target's personality and behavior after reading a diary entry describing a couple's initial sexual encounter. The nature of the couple's relationship and who provided the condom were manipulated between participants. Women inferred a committed relationship when intimacy was present. Women rated the target, and her behavior, as more acceptable when she had sex in a relationship with commitment. When she provided a condom, the target was perceived as less nice in the noncommitted than in the committed relationship. When her partner provided the condom, however, commitment level did not influence personality ratings. 相似文献
875.
This article demonstrates that there is a role for behavior-analytic techniques in the area of farm animal welfare and provides examples of the kinds of work that can be done. Behavior-analytic procedures, specifically those used in the study of psychophysics, preference, and demand, can provide answers to three questions people concerned with the welfare of farm animals are likely to ask: What can the animals detect? What do they like and dislike? What will they work to attain or preserve? Such information certainly is necessary for making reasonable decisions about animal welfare, although it is not sufficient in and of itself. 相似文献
876.
Sexuality education for children and young adults is one of the most heavily debated issues facing policy-makers, national AIDS program planners, and educators, provoking arguments over how explicit education materials should be, how much of it there should be, how often it should be given, and at what age instruction should commence. In this context, the World Health Organization's Global Program on AIDS' Office of Intervention Development and Support commissioned a comprehensive literature review to assess the effects of HIV/AIDS and sexuality education upon young people's sexual behavior. 52 reports culled from a search of 12 literature databases were reviewed. The main purpose of the review is to inform policy-makers, program planners, and educators about the impact of HIV and/or sexuality education upon the sexual behavior of youth as described in the published literature. Of 47 studies which evaluated interventions, 25 reported that HIV/AIDS and sexuality education neither increased nor decreased sexual activity and attendant rates of pregnancy and sexually transmitted diseases (STDs). 17 reported that HIV and/or sexuality education delayed the onset of sexual activity, reduced the number of sex partners, or reduced unplanned pregnancy and STD rates Only 3 studies found increases in sexual behavior associated with sexuality education. Inadequacies in study design, analytic techniques, outcome indicators, and the reporting of statistics are discussed. 相似文献
877.
Theodore P. Remley Jr. Barbara Herlihy Scott B. Herlihy 《Journal of counseling and development : JCD》1997,75(3):213-218
In 1996, the U.S. Supreme Court held that communications between licensed psychotherapists and their patients are privileged under the Federal Rules of Evidence. The nature of privileged communication, the history of this Supreme Court decision, and implications of the decision for counselors are discussed. 相似文献
878.
879.
Richard L. Port Heather A. Murphy R. DAniel Miller Kevin S. Seybold 《Current Psychology》1997,15(4):332-339
present research examined the role of hippocampal NMDA-dependent synaptic potentiation on appetitive instrumental conditioning
under a continuous reinforcement schedule. In the first experiment, low (.025 mg.kg) or moderate (.05 mg/kg) dosages of the
NMDA receptor antagonist, MK801, failed to increase the number of training days required to reach acquisition criterion; number
of training days required to reach criterion for extinction were also unaffected. In the second experiment, a higher dosage
(.10 mg/kg) of MK801 or induction of long-term potentiation failed to alter the number of responses occurring during acquisition.
These data suggest that hippocampal synaptic potentiation does not play a prominent role in instrumental learning with simple
contingency conditions. It is suggested that hippocampal LTP reflects a perceptual process that contributes differentially
to spatial cognition, classical and instrumental conditioning. 相似文献
880.
Jeffrey A. Bernat Stephanie Stolp Karen S. Calhoun Henry E. Adams 《Journal of psychopathology and behavioral assessment》1997,19(4):315-330
In two studies, the construct (convergent and discriminant) validity and test-retest reliability of a date rape decision-latency measure was examined. In Study 1, 174 college men completed measures related to sexual aggression and listened to an audiotaped simulation of a date rape, during which cues of nonconsent and force gradually escalated over time. Participants were instructed to respond, by pressing a button which recorded the latency of their decisions in seconds, if and when they believed the man depicted in the scenario should stop his sexual advances. Results demonstrated positive associations between prolonged decision latencies and sexually aggressive behavior, calloused sexual beliefs, acceptance of interpersonal violence, and sexual promiscuity. In Study 2, initial results were cross-validated in a sample of 102 college men, and discriminant validity was established as decision latencies were unassociated with measures of social desirability, alcohol consumption and drug use. Test-retest reliability assessed over a 2-week interval was .87.The authors wish to thank Alan Gross and Brian Marx for providing the audiotaped stimulus materials, Richard Marsh for writing the decision-latency computer program, Jason Hicks for assisting with programming, and the undergraduate research assistants for serving as experimenters. 相似文献