全文获取类型
收费全文 | 187511篇 |
免费 | 8330篇 |
国内免费 | 158篇 |
出版年
2020年 | 2776篇 |
2019年 | 3434篇 |
2018年 | 3677篇 |
2017年 | 4093篇 |
2016年 | 4698篇 |
2015年 | 3910篇 |
2014年 | 4793篇 |
2013年 | 23394篇 |
2012年 | 4935篇 |
2011年 | 4203篇 |
2010年 | 4066篇 |
2009年 | 4837篇 |
2008年 | 4324篇 |
2007年 | 3904篇 |
2006年 | 4365篇 |
2005年 | 4315篇 |
2004年 | 3814篇 |
2003年 | 3432篇 |
2002年 | 3259篇 |
2001年 | 4007篇 |
2000年 | 3805篇 |
1999年 | 3568篇 |
1998年 | 2883篇 |
1997年 | 2700篇 |
1996年 | 2626篇 |
1995年 | 2451篇 |
1994年 | 2423篇 |
1993年 | 2366篇 |
1992年 | 2961篇 |
1991年 | 2798篇 |
1990年 | 2650篇 |
1989年 | 2573篇 |
1988年 | 2537篇 |
1987年 | 2523篇 |
1986年 | 2528篇 |
1985年 | 2755篇 |
1984年 | 2750篇 |
1983年 | 2510篇 |
1982年 | 2440篇 |
1981年 | 2417篇 |
1980年 | 2259篇 |
1979年 | 2497篇 |
1978年 | 2317篇 |
1977年 | 2245篇 |
1976年 | 2087篇 |
1975年 | 2263篇 |
1974年 | 2340篇 |
1973年 | 2289篇 |
1972年 | 1852篇 |
1971年 | 1744篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
981.
The main issue of this paper concerns the mediating role of risk appraisal in the relation between past and future behavior. We expected previous risky behavior to heighten risk appraisal, which, in turn, should stimulate preventive behavior. Results ofthree tests of this mediation hypothesis showed that past behavior was strongly related to future behavior; people who behaved hazardously in the past indicated that they tend to do so in the future. Generally, the expected relation between past behavior and risk appraisal was supported. More risky behavior in the past was associated with a heightened risk appraisal. Results also indicate a relation between risk appraisal and future behavior, but in the opposite direction as predicted. Heightened risk appraisal was related to increased levels of risk in future behavior. When predicting future behavior by both risk appraisal and past behavior the effect of risk appraisal on future behavior disappeared, while past behavior remained a strong predictor of future behavior. In a few cases risk appraisal still predicted future behavior when past behavior was controlled for. Unfortunately, these cases showed the opposite relation; i.e., heightened risk appraisal was related to more risky future behavior. Implications of these findings for research on the role of risk appraisal will be discussed. 相似文献
982.
A series of focus group interviews was used to identify major sources of stress and coping responses of Grade 10 students. Relationships with parents and family, work, and lack of money were found to be important sources of stress. Major coping responses included substance use and diversionary activities. Differences between academic streams (tracks) in sources of stress and coping responses were examined. 相似文献
983.
To study malevolent representations, earliest memories were reliably coded on scales of affect tone. Ss were diagnosed with borderline personality disorder: 31 without and 30 with concurrent major depression. Nonborderline comparison subjects had either major depressive disorder (n = 26) or no psychiatric diagnosis (n = 30). Borderline subjects were discriminated from comparison subjects by their more malevolent representations; they more frequently produced memories involving deliberate injury; and they portrayed potential helpers as less helpful. Results suggest the diagnostic significance of malevolent representations, which need to be explained by any theory of borderline personality disorder. 相似文献
984.
Twenty depressed patients with major depressive disorder, 20 nondepressed matched control subjects, and 17 patients with anxiety disorders were compared in different measures of social problem solving. Problem solving was assessed with the Means-Ends Problem-Solving Test (Study 1), the solution of personal problems, and a problem-solving questionnaire (Study 2). Results showed that, as predicted, depressed subjects suffered from a deficit in problem solving in all three measures. The majority of these deficits were also displayed by the clinical control group rather than being specific to a diagnosis of depression. However, depressed subjects produced less effective solutions than did normal and clinical control subjects. The results suggest that depressed and anxious patients may have difficulties at different stages of the problem-solving process. 相似文献
985.
To test Coyne's (1976b) theory of depression, students' levels of depressive symptoms, reassurance seeking, and self-esteem were assessed at Time 1, and their same-gender roommates' appraisals of them were assessed 5 weeks later. Mildly depressed students engaged in the type of reassurance seeking described by Coyne. Among men, but not women, mildly depressed students were rejected if they strongly sought reassurance and had low self-esteem but not if they did not seek reassurance or had high self-esteem. Although induction of depressed symptoms in roommates did occur, this contagion effect did not account for the depression-rejection relationship. The prediction that unsupportive, intolerant, or unempathic others would be particularly likely to respond with rejection to reassurance-seeking depressed students with low self-esteem received partial support. Implications for future work on the interpersonal aspects of depression are discussed. 相似文献
986.
Eighty-two women, presenting as normal-weight bulimics, obese binge eaters, social phobics, and individuals with panic disorder, were compared on anxiety, depression, and substance abuse. All were administered the Anxiety Disorder Interview Schedule-Revised and completed the Michigan Alcohol Screening Test, Drug Abuse Screening Test, and Self-Consciousness Scale. A striking proportion of eating disorder subjects were comorbid for one or more anxiety disorders, the most frequent diagnoses being generalized anxiety disorder and social phobia. The results suggest that the place of anxiety in bulimia nervosa goes beyond that discussed within the context of the anxiety reduction model. Conflicting comorbidity findings among this and prior investigations are noted, however, and discussed in terms of the issue of differential diagnosis between eating and anxiety disorders. 相似文献
987.
J M Gold C Randolph C J Carpenter T E Goldberg D R Weinberger 《Journal of abnormal psychology》1992,101(3):487-494
Effortful and automatic memory task performances were examined in 36 schizophrenic patients and 18 normal control Ss. Tasks included free recall, recognition, and frequency estimation. Patients demonstrated impairment in recall, in recognition, in semantic encoding, and in frequency estimation. Deficits were observed across tasks despite differences in attentional demands. The results suggest a basic compromise of memory function, which is consistent with recent neuroimaging evidence of structural or physiological abnormalities in frontal and temporal lobe structures in schizophrenia. 相似文献
988.
Predictors and consequences of childhood depressive symptoms: a 5-year longitudinal study. 总被引:31,自引:0,他引:31
A 5-year longitudinal study investigated the interrelationships among children's experiences of depressive symptoms, negative life events, explanatory style, and helplessness behaviors in social and achievement situations. The results revealed that early in childhood, negative events, but not explanatory style, predicted depressive symptoms; later in childhood, a pessimistic explanatory style emerged as a significant predictor of depressive symptoms, alone and in conjunction with negative events. When children suffered periods of depression, their explanatory styles not only deteriorated but remained pessimistic even after their depression subsided, presumably putting them at risk for future episodes of depression. Some children seem repeatedly prone to depressive symptoms over periods of at least 2 years. Depressed children consistently showed helpless behaviors in social and achievement settings. 相似文献
989.
LYMAN C. WYNNE M.D. Ph.D. CLEVELAND G. SHIELDS Ph.D. MARK I. SIRKIN Ph.D. 《Family process》1992,31(1):3-18
This article examines and clarifies controversies about the concept of illness in the field of family therapy. We contend that illness, as traditionally understood in all cultures, is a relational, transactional concept that is highly congruent with core principles of present-day family theories. Family therapists need not buy into a biotechnical, reductionistic reframing of illness as disease. Rather, it is more appropriate to conceptualize and work with illness as a narrative placed in a biopsychosocial context. Such a narrative includes how shared responsibility for coping and for finding solutions can take place, without becoming involved in disputes about causal models. 相似文献
990.