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   53283篇
  免费   1489篇
  国内免费   26篇
  2020年   408篇
  2019年   517篇
  2018年   4002篇
  2017年   3321篇
  2016年   2914篇
  2015年   676篇
  2014年   667篇
  2013年   2783篇
  2012年   1673篇
  2011年   3424篇
  2010年   3097篇
  2009年   2185篇
  2008年   2613篇
  2007年   3063篇
  2006年   897篇
  2005年   960篇
  2004年   910篇
  2003年   791篇
  2002年   763篇
  2001年   1116篇
  2000年   1133篇
  1999年   819篇
  1998年   373篇
  1997年   340篇
  1996年   330篇
  1995年   347篇
  1992年   645篇
  1991年   606篇
  1990年   582篇
  1989年   553篇
  1988年   549篇
  1987年   494篇
  1986年   491篇
  1985年   550篇
  1984年   451篇
  1983年   415篇
  1982年   332篇
  1979年   490篇
  1978年   338篇
  1976年   332篇
  1975年   373篇
  1974年   445篇
  1973年   473篇
  1972年   402篇
  1971年   349篇
  1970年   321篇
  1969年   339篇
  1968年   418篇
  1967年   371篇
  1966年   358篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
981.
982.
This paper reports on several patients who use sado-masochism as a defense against an unconscious wish for and fear of merging. The sado-masochism can be expressed as a sexual perversion or in a difficult ungratifying interpersonal relationship. These relationships have some of the quality of addictions in that the patients have a compulsive need to continue them and find it extremely difficult to leave them. Therapy must focus on helping the patient become more separate, rather than on other problems which may also be present. Initially, the therapist needs to take an educational stance in regard to the process the patient must complete, rather than the more traditional analytic stance.  相似文献   
983.
984.
ABSTRACT Previous research has indicated that extraversion and neuroticism are substantially affected both by genotype and environment. This study assesses genetic and environmental influences on the other three components of the five-factor model of personality: Openness to Experience, Agreeableness, and Conscientiousness. An abbreviated version of the NEO Personality Inventory (NEO-PI) was administered to 82 pairs of identical twins and 171 pairs of fraternal twins reared apart and 132 pairs of identical twins and 167 pairs of fraternal twins reared together. Estimates of genetic and environmental effects for Openness and Conscientiousness were similar to those found in other studies of personality: Genetic influence was substantial and there was little evidence of shared rearing environment. Results for Agreeableness were different: Genetic influence accounted for only 12% of the variance and shared rearing environment accounted for 21% of the variance. Few significant gender or age differences for genetic and environmental parameters were found in model-fitting analyses.  相似文献   
985.
986.
The authors report a study that suggests the career paths of workers on short-term federal projects may be enhanced as a result of developing a relationship with a mentor through such projects.  相似文献   
987.
Because rheumatoid arthritis (RA) has a more unpredictable course than osteoarthritis (OA), we hypothesized that generalized expectancies (optimistic/ pessimistic) influence the psychosocial adjustment of RA patients, whereas disease severity influences the adjustment of OA patients. Path analysis (LISREL VI) revealed that pessimistic RA patients (N= 107) and the more physically disabled OA patients (N= 108) reported poorer adjustment. The hypothesized mediating role of coping was supported for the RA but not the OA sample; that is, pessimism was associated with poor adjustment through greater use of wishful thinking coping. Unexpectedly, problem-solving coping was not found to mediate the optimism adjustment relationship.  相似文献   
988.
There is growing evidence to suggest that the ways in which people think about their health problems may have significant implications for psychological and physical well-being. This possibility has the greatest consequences for those groups facing health problems on a daily basis, in particular, the elderly. This study examined the role of perceived health barriers and value for health in later life. A Perceived Health Barriers (absent, present) by Health Value (low, medium, high) 2.3 factorial design was analyzed for younger and older seniors on: number of life-threatening diseases, need for health care, and life satisfaction. In addition, a longitudinal design was used to examine the joint roles of perceived health barriers (PHBs) and health value (HV) on mortality. Findings generally indicated that individuals’ PHBs and HV are associated with health-related outcomes; however, the results differed for young and old elders. Among young elders, those with PHBs and those with high HV had the most negati e profile. That is, they had more diseases, higher health care needs, and lower life satisfaction. Among older elders, the findings were more complicated in that the relationship between PHB and the outcomes depended on HV. Overall, the patterns for old elders suggest that perceived health barriers are most relevant among those with medium value for health and least relevant among those with low value for health.  相似文献   
989.
990.
Violations of strong stochastic transitivity in concurrent-chains choice were first reported by Navarick and Fantino. In a series of articles, Navarick and Fantino concluded that neither a unidimensional model capable of predicting exact choice probabilities nor a fixed-variable equivalence rule was possible for the concurrent-chains procedure. I show that when choice is modeled contextually (i.e., when preference for a schedule is affected by factors other than the schedule itself, e.g., aspects of the alternative schedule), a unidimensional, exact-choice probability model is possible that both predicts the intransitivities reported by Navarick and Fantino and provides a fixed-variable equivalence rule for the concurrent-chains procedure. The contextual model is an extension of the generalized matching law and violates a key assumption underlying traditional choice models—simple scalability—because of (a) schedule interdependence and (b) bias from procedural contingencies. Therefore, strong stochastic transitivity cannot be expected to hold. Contextual scalability is analyzed to reveal a hierarchy of context effects in choice. Navarick and Fantino's intransitivities can be satisfactorily explained by bias. If attribute sensitivity is context dependent, however, and if there are similarity structures among choice alternatives, the contextual model is shown to be able to predict violations of ordinal preference. Therefore, it may be possible to formulate a deterministic, general psychophysical model of choice as a behavioral alternative to probabilistic, multidimensional choice theories.  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