全文获取类型
收费全文 | 63747篇 |
免费 | 2529篇 |
国内免费 | 21篇 |
出版年
2020年 | 575篇 |
2019年 | 776篇 |
2018年 | 1073篇 |
2017年 | 1074篇 |
2016年 | 1139篇 |
2015年 | 836篇 |
2014年 | 986篇 |
2013年 | 4677篇 |
2012年 | 1861篇 |
2011年 | 2015篇 |
2010年 | 1234篇 |
2009年 | 1236篇 |
2008年 | 1789篇 |
2007年 | 1809篇 |
2006年 | 1645篇 |
2005年 | 1464篇 |
2004年 | 1362篇 |
2003年 | 1264篇 |
2002年 | 1382篇 |
2001年 | 2119篇 |
2000年 | 2078篇 |
1999年 | 1553篇 |
1998年 | 725篇 |
1997年 | 647篇 |
1996年 | 650篇 |
1993年 | 595篇 |
1992年 | 1322篇 |
1991年 | 1220篇 |
1990年 | 1203篇 |
1989年 | 1102篇 |
1988年 | 1075篇 |
1987年 | 1027篇 |
1986年 | 1120篇 |
1985年 | 1130篇 |
1984年 | 942篇 |
1983年 | 864篇 |
1982年 | 601篇 |
1981年 | 602篇 |
1979年 | 1010篇 |
1978年 | 720篇 |
1975年 | 809篇 |
1974年 | 891篇 |
1973年 | 988篇 |
1972年 | 825篇 |
1971年 | 777篇 |
1970年 | 706篇 |
1969年 | 733篇 |
1968年 | 944篇 |
1967年 | 842篇 |
1966年 | 731篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
The paper investigates 54 myelograms and their influence on diagnostic thinking efficacy, on patient management efficacy, and on ultimate outcome efficacy, using statistical methods. Conventional myelography contributes to diagnostic thinking efficacy having a LLR- value of approximately 0.9. With an accuracy value of 0.95 it can be regarded as a reliable method of diagnosis. It alters diagnostic thinking efficacy in no less than 83% (94%) of the cases and patients management efficacy in 89%. Thus, by definition, myelography may be said to affect the state of health of the myelographed patients in 94.4%. 相似文献
992.
This article attempts to apply a theory of aggression as motivation to overcome obstacles to the understanding of phobic states and their formation. The role of aggression in the genesis of phobic conditions is discussed, and the traditional analytic view of aggression as instinctual drive is contrasted with a motivational approach. The motivational view offers the advantage of a clearer understanding of the stimulus contexts, representational connections, and both real and imaginary object connections that are lacking in the more traditional understanding of aggression as a biological drive. 相似文献
993.
Four of our own cases that presented a clinical picture of dementia are discussed. A study of the relative literature has failed to reveal any "swing" in the pattern of the clinical condition: Just as it did ninety years age, paralytic dementia accounts today for well over 60% of all cases, those clinical pictures erroneously regarded as "typical" "classic", accounting for a mere 10%-15% of cases. The need for routine lues serology is pointed out. 相似文献
994.
995.
996.
Mood effects on person-perception judgments 总被引:4,自引:0,他引:4
997.
In this study we investigated the immediate and continued impact on women of a major stressful event, the outcome of pregnancy, and the mitigating effect of self-esteem and intimacy with their spouse on their reactions. Few other studies have investigated initial reactions to crisis events. Ninety-nine Israeli women who experienced either normal delivery or pregnancy complications were interviewed at the time of the event and 3 months later. High self-esteem was found to limit feelings of depression at both times. Intimacy with spouse limited depression at the event, but not at follow-up. High self-esteem was seen as always being exploitable by women who possessed it, whereas the benefit of intimacy with spouse was seen as being dependent on situational demands and environmental constraints. Cross-cultural implications were presented. 相似文献
998.
This study explored the relationship among love deprivation, Performance greater than Verbal discrepancy, and violent crime in a sample of juvenile probationers. Love deprivation and P greater than V discrepancy was significantly related to violent delinquency after adjusting for the effects of both race and social class, two variables often closely associated with violent delinquency. Also, love deprivation was strongly related to P greater than V discrepancy. We speculated that high performance IQ scores relative to verbal scores are a function of a lack of disruption in the short-term memory mechanisms of high P greater than V subjects, that this nondisruption is a function of hyporeactive autonomic nervous systems, and that this hyporeactivity could itself be a function of early love deprivation. 相似文献
999.
The purpose of this study was to explore differences in body satisfaction among female adolescents 14 to 18 years of age. Principal components analysis of a body cathexis measure completed by 751 high school cheerleaders indicated that six factors defined the adolescents' attitudes toward their bodies: satisfaction with the midsection and overall appearance, peripheral body parts, hair and face, mouth, hands, and height. An Age X Body Satisfaction multivariate analysis of variance (MANOVA) was conducted; a Bonferroni adjusted alpha of .007 was established for subsequent ANOVAs. Satisfaction with the mouth increased significantly as age increased, and a similar but nonsignificant trend was found for peripheral body parts. The findings contradict previous research reporting no age differences in the body satisfaction of adolescents. Role demands and physical maturation of the cheerleaders may explain differences based on age. 相似文献
1000.
The Threat Index and the Death Anxiety Scale were administered to 228 subjects. Based on the high/low criterion scores, 105 subjects were assigned to the following four groups: (a) high death threat/high death anxiety, (b) high death threat/low death anxiety, (c) low death threat/high death anxiety, and (d) low death threat/low death anxiety. During the experimental phase of the study, subjects viewed a filmstrip on death rituals in various cultures. A recall test was then administered. Results indicated no significant group differences on recall performance. Initial no-show rates for the second part of the experiment were observed in the four groups reflecting a significant negative relationship between death anxiety and initial no-show rates. The possibility of defensive responding on the Death Anxiety Scale was suggested. 相似文献