全文获取类型
收费全文 | 14035篇 |
免费 | 607篇 |
国内免费 | 13篇 |
专业分类
14655篇 |
出版年
2023年 | 77篇 |
2021年 | 126篇 |
2020年 | 230篇 |
2019年 | 283篇 |
2018年 | 376篇 |
2017年 | 374篇 |
2016年 | 391篇 |
2015年 | 283篇 |
2014年 | 360篇 |
2013年 | 1576篇 |
2012年 | 626篇 |
2011年 | 663篇 |
2010年 | 399篇 |
2009年 | 430篇 |
2008年 | 577篇 |
2007年 | 574篇 |
2006年 | 579篇 |
2005年 | 524篇 |
2004年 | 486篇 |
2003年 | 508篇 |
2002年 | 494篇 |
2001年 | 247篇 |
2000年 | 224篇 |
1999年 | 223篇 |
1998年 | 203篇 |
1997年 | 215篇 |
1996年 | 194篇 |
1995年 | 171篇 |
1994年 | 158篇 |
1993年 | 154篇 |
1992年 | 141篇 |
1991年 | 152篇 |
1990年 | 135篇 |
1989年 | 123篇 |
1988年 | 89篇 |
1987年 | 119篇 |
1986年 | 127篇 |
1985年 | 162篇 |
1984年 | 162篇 |
1983年 | 138篇 |
1982年 | 130篇 |
1981年 | 144篇 |
1980年 | 124篇 |
1979年 | 108篇 |
1978年 | 118篇 |
1977年 | 109篇 |
1976年 | 107篇 |
1975年 | 95篇 |
1974年 | 104篇 |
1973年 | 85篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
101.
David Jarjoura Michael W. O'Hara 《Journal of psychopathology and behavioral assessment》1987,9(4):389-402
A distinction can be drawn between those items on the Beck Depression Inventory (BDI) that reflect mainly cognitive and emotional symptoms and those that reflect somatic symptoms. Responses to the BDI were obtained from women at 3, 6, 9, and 24 weeks postpartum. The covariances of cognitive and somatic symptom scores across the four time points were closely fit by a structural equations model referred to as the simplex. The modeling indicates that earlier cognitive scores directly predict later somatic scores but that early somatic scores do not directly predict later cognitive scores. Other data confirm the results.Much of this research was supported while the first author was an NIMH Fellow at the University of Iowa (MH15168). 相似文献
102.
A general latent variable model is given which includes the specification of a missing data mechanism. This framework allows for an elucidating discussion of existing general multivariate theory bearing on maximum likelihood estimation with missing data. Here, missing completely at random is not a prerequisite for unbiased estimation in large samples, as when using the traditional listwise or pairwise present data approaches. The theory is connected with old and new results in the area of selection and factorial invariance. It is pointed out that in many applications, maximum likelihood estimation with missing data may be carried out by existing structural equation modeling software, such as LISREL and LISCOMP. Several sets of artifical data are generated within the general model framework. The proposed estimator is compared to the two traditional ones and found superior.The research of the first author was supported by grant No. SES-8312583 from the National Science Foundation and by a Spencer Foundation grant. We wish to thank Chuen-Rong Chan for drawing the path diagram. 相似文献
103.
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
104.
105.
R. M. Foxx Martin J. McMorrow Michele Hernandez Martha Kyle Ron G. Bittle 《Behavioral Interventions》1987,2(2):77-88
A social skills training program was evaluated with emotionally disturbed adolescent inpatients. The targeted social skills required an action or reaction within six skill areas. The program was adapted from a commercially available social skills training game that features the use of response specific feedback, self-monitoring, individualized reinforcers, and individualized performance criteria. A peer conducted the baseline and posttraining sessions while the training was conducted by an adult who had no previous interactive history with the subjects. A multiple baseline design across groups demonstrated that the program increased appropriate responding in all skill areas and that these effects generalized during the posttraining peer conducted sessions. A generalization test indicated that the subjects used their newly learned skills with a novel adult outside the training setting. The program appears quite applicable to emotionally disturbed adolescents since it targets skills in a variety of areas and employs standardized procedures to enhance replicability. 相似文献
106.
107.
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
108.
As outlined by Snyder and Ickes (1985), the study of personality can be undertaken using one of three research approaches dispositional, situational, and interactive We show how the Social Relations Model provides an integrative method to estimate simultaneously dispositional, situational, and interactive effects Reviewed are component approaches to the study of personality The Social Relations Model is shown to be a component model (a special case of generalizability theory) applied in a social interaction context In the model, dispositional, situational, and interactive effects are termed actor, partner, and relationship effects, respectively The Social Relations Model can be used to answer a number of important issues in personality research The model can be used to assess reliability, measure the validity of self-ratings, and validate self-report inventories The model requires special designs in winch each person interacts with multiple partners Empirical examples are presented in which social anxiety, sex role inventories, and self-disclosure are studied 相似文献
109.
David C. McClelland 《Journal of personality》1986,54(2):334-353
The mainstream view of love is that it is a state that arises from people mutually reinforcing each other or providing benefits to each other Yet careful quantitative analyses of imaginative thought patterns of people in love or in a state of affiliative arousal reveal themes of dialogue, commitment, and harmony rather than of mutual benefits It is suggested that asking people about love leads them to give causal explanations for the state which psychologists have elaborated into the theory that love is a response to having one's needs met Imaginative experiences characteristic of the state of being in love on the other hand may be different because they are primarily right brain mediated and do not share in the causal, instrumental type of reasoning characteristic of left brain conscious thinking Such conceivably right brain mediated experiences in TATs are more closely associated than presumably left brain mediated self-reports are with such physiological measures as evoked scalp potentials, neurohormone concentrations, and immune functions A vew of love that takes both self-report (left brain) and fantasy (right brain) measures into account does a better job of predicting affiliative behavior than does a view that relies solely on one or the other of the two types of measures 相似文献
110.
A two-phase functional analysis of a profoundly retarded 19-year-old male's pica facilitated the design of an effective intervention containing no aversive components. In the first analysis, frequent staff-client interaction resulted in 25% and 66% less pica than limited and no interaction, respectively. Paradoxical effects were obtained in the second analysis, where no protective helmet resulted in 38% and 26% less pica than the helmet with face shield and helmet without face shield, respectively. On the basis of these analyses, limited interaction and no helmet conditions were combined in an effective, staff-implemented treatment at a medium-sized institution. 相似文献