全文获取类型
收费全文 | 2613篇 |
免费 | 71篇 |
国内免费 | 2篇 |
出版年
2018年 | 32篇 |
2017年 | 46篇 |
2016年 | 53篇 |
2015年 | 29篇 |
2014年 | 36篇 |
2013年 | 316篇 |
2012年 | 72篇 |
2011年 | 77篇 |
2010年 | 42篇 |
2009年 | 51篇 |
2008年 | 65篇 |
2007年 | 63篇 |
2006年 | 73篇 |
2005年 | 84篇 |
2004年 | 70篇 |
2003年 | 71篇 |
2002年 | 69篇 |
2001年 | 35篇 |
2000年 | 30篇 |
1999年 | 43篇 |
1998年 | 54篇 |
1997年 | 36篇 |
1996年 | 41篇 |
1995年 | 36篇 |
1994年 | 35篇 |
1993年 | 36篇 |
1992年 | 31篇 |
1991年 | 37篇 |
1990年 | 34篇 |
1989年 | 44篇 |
1988年 | 36篇 |
1987年 | 32篇 |
1986年 | 30篇 |
1985年 | 25篇 |
1984年 | 44篇 |
1983年 | 35篇 |
1982年 | 48篇 |
1981年 | 37篇 |
1980年 | 41篇 |
1979年 | 42篇 |
1978年 | 45篇 |
1977年 | 36篇 |
1976年 | 39篇 |
1975年 | 35篇 |
1974年 | 43篇 |
1973年 | 36篇 |
1971年 | 26篇 |
1969年 | 33篇 |
1968年 | 26篇 |
1967年 | 25篇 |
排序方式: 共有2686条查询结果,搜索用时 15 毫秒
991.
Social science research and theory about familial orientations and reproductive ideals have largely neglected males' attitudes. Drawing on demographic and status attainment perspectives, this study applies a model of processes underlying marriage and family timing to longitudinal data on 288 young adult males from the Southern Youth Study. Several posited influences of family of origin factors, significant others, and adolescent status and familial aspirations on marital timing and early family growth are assessed.Development of this report was sponsored in part by the Texas Agricultural Experiment Station and contributes both to TAES Project H-2811 and to USDA (CSRS) Regional Research Project S-81, and in part by the Maxwell Policy Center on Aging and the All-University Gerontology Center, Syracuse University through Title IV-C Grant #90-A-1054101 from the Administration on Aging, Department of Health, Education, and Welfare. Information for analysis was obtained by pooling data collected under grants provided by the Agricultural Experiment Stations of Alabama, Georgia, South Carolina, and Texas. Appreciation is expressed to John Womack, Paul D. Mader, and G. David Curry for their advice at various stages of this research. 相似文献
992.
Comparisons are made between self-identified feminists and traditionalists on an attitudinal inventory scale. Feminists are found to display a more consistent sex-role ideology as measured by inter-item consistency. Traditionalists believe in labor and political equality, but differ from feminists in regard to relations with men and notions of domestic roles. The findings suggest that a more consistent sex-role ideology among women should occur with increased feminist identification. However, stereotypes and misunderstandings concerning feminism may prevent this development among many women.This article is a revised version of a paper presented at the Alpha Kappa Delta Research Symposium, Richmond, Virginia, February 1978. 相似文献
993.
Inversion and photographic negation both impair face recognition. Inversion seems to disrupt processing of the spatial relationship between facial features ('relational' processing) which normally occurs with upright faces and which facilitates their recognition. It remains unclear why negation affects recognition. To find out if negation impairs relational processing, we investigated whether negative faces are subject to the 'chimeric-face effect'. Recognition of the top half of a composite face (constructed from top and bottom halves of different faces) is difficult when the face is upright, but not when it is inverted. To perform this task successfully, the bottom half of the face has to be disregarded, but the relational processing which normally occurs with upright faces makes this difficult. Inversion reduces relational processing and thus facilitates performance on this particular task. In our experiments, subjects saw pairs of chimeric faces and had to decide whether or not the top halves were identical. On half the trials the two chimeras had identical tops; on the remaining trials the top halves were different. (The bottom halves were always different.) All permutations of orientation (upright or inverted) and luminance (normal or negative) were used. In experiment 1, each pair of 'identical' top halves were the same in all respects. Experiment 2 used differently oriented views of the same person, to preclude matches being based on incidental features of the images rather than the faces displayed within them. In both experiments, similar chimeric-face effects were obtained with both positive and negative faces, implying that negative faces evoke some form of relational processing. It is argued that there may be more than one kind of relational processing involved in face recognition: the 'chimeric-face effect' may reflect an initial 'holistic' processing which binds facial features into a 'Gestalt', rather than being a demonstration of the configurational processing involved in individual recognition. 相似文献
994.
Christianne L. Esposito George A. Clum 《Journal of psychopathology and behavioral assessment》1999,21(2):171-182
Research which has related scores on the Children's Depression Inventory (CDI) to suicidality have generally neglected to examine the possibility that specific depressive factors within the CDI may be more predictive of suicidality than the full scale score. Knowledge of such factors would help to explain the relationship between depression and suicidality and improve the prediction of suicidal behavior. The current study examined the relationship of depressive factors to suicidality in a sample of 200 incarcerated juvenile delinquents. The published factor structure for the CDI and one derived from the delinquent population were compared. Results revealed two factors from the derived solution, hopelessness and low self-esteem, to be more powerful predictors of suicidal ideation than the full-scale CDI score. These results suggest that symptoms such as low self-esteem and hopelessness may be responsible for the well-documented relationship between depression and suicidality. Furthermore, it appears that the prediction of suicidality may be improved by examining specific depressive factors in suicide research as opposed to full-scale scores from depression inventories such as the CDI. 相似文献
995.
New knowledge about the specific brain regions involved in depression is rapidly evolving due to advances in functional neuroimaging techniques. Several new regionally specific somatic interventions build on this modern neuroanatomic information. These latest methods promise to revolutionize the understanding and treatment of depression. This article reviews the past and current use of these techniques, with an eye toward where they are heading in the next century. 相似文献
996.
In a first-order reversed-phi motion stimulus (Anstis, 1970), the black-white contrast of successive frames is reversed, and the direction of apparent motion may, under some conditions, appear to be reversed. It is demonstrated here that, for many classes of stimuli, this reversal is a mathematical property of the stimuli themselves, and the real problem is in perceiving forward motion, which involves the second- or third-order motion systems or both. Three classes of novel second-order reversed-phi stimuli (contrast, spatial frequency, and flicker modulation) that are invisible to first-order motion analysis were constructed. In these stimuli, the salient stimulus features move in theforward (feature displacement) direction, but the second-order motion energy model predicts motion in thereversed direction. In peripheral vision, for all stimulus types and all temporal frequencies, all the observers saw only the reversed-phi direction of motion. In central vision, the observers also perceived reversed motion at temporal frequencies above about 4 Hz, but they perceived movement in the forward direction at lower temporal frequencies. Since all of these stimuli are invisible to first-order motion, these results indicate that the second-order reversed-phi stimuli activate two subsequent competing motion mech-anisms, both of which involve an initial stage of texture grabbing (spatiotemporal filtering, followed by fullwave rectification). The second-order motion system then applies a Reichardt detector (or equiva-lently, motion energy analysis) directly to this signal and arrives at the reversed-phi direction. The third-order system marks the location of features that differ from the background (the figure) in a salience map and computes motion in the forward direction from the changes in the spatiotemporal location of these marks. The second-order system’s report of reversed movement dominates in peripheral vision and in central vision at higher temporal frequencies, because it has better spatial and temporal resolu-tion than the third-order system, which has a cutoff frequency of 3–4 Hz (Lu & Sperling, 1995b). In cen-tral vision, below 3–4 Hz, the third-order system’s report of resolvable forward movement of something salient (the figure) dominates the second-order system’s report of texture contrast movement. 相似文献
997.
The order of authorship is the reverse of the order of a previous paper by the same authors. The paper is a thoroughly collaborative project. We are grateful to a number of people for comments on earlier drafts, most especially Denny Bradshaw, Peter Clark, David Henderson, Harold Kincaid, Georges Rey, John Tienson, and an anonymous referee. The second author also wishes to thank the Centre for Philosophy and Public Affairs, Department of Moral Philosophy, University of St. Andrews, Scotland, and its award of a Tennent Caledonian Research Fellowship, which helped to fund his work on this paper. 相似文献
998.
999.
George Wolford 《Memory & cognition》1991,19(4):415-417
In her commentary on our article, Bar-Hillel (1991) argues that our normative interpretation of the Lindaproblem is inaccurate and that the representativeness heuristic can account for all of the relevant data. I argue that the normative interpretation of the Linda problem remains slippery and that representativeness fails to account for much of the data. Furthermore, substantial evidence supports our suggestion that subjects use different underlying models in estimating likelihoods in different con problems. 相似文献
1000.
Sheppard G. Kellam Lisa Werthamer-Larsson Lawrence J. Dolan C. Hendricks Brown Lawrence S. Mayer George W. Rebok James C. Anthony Jolene Laudolff Gail Edelsohn Leonard Wheeler 《American journal of community psychology》1991,19(4):563-584
Describes a conceptual framework for identifying and targeting developmental antecedents in early childhood that have been shown in previous work to predict delinquency and violent behavior, heavy drug use, depression, and other psychiatric symptoms and possibly disorders in late adolescence and into adulthood. Criteria are described that guided choices of targets for two epidemiologically based, randomized preventive trials carried out in 19 elementary schools in the eastern half of Baltimore, involving more than 2,400 first-grade children over the course of first and second grades. Baseline models derived from the first of two cohorts show the evolving patterns of concurrence among the target antecedents. The central role of concentration problems emerged. From Fall to Spring in first grade, concentration problems led to shy and aggressive behavior and poor achievement in both genders and to depressive symptoms among girls. There was evidence for reciprocal relationships in girls. For example, depressive symptoms led to poor achievement in both girls and boys, whereas poor achievement led to depressive symptoms in girls but not boys, at least over the first-grade year. These results provide important epidemiological data relevant to the developmental paths leading to the problem outcomes and suggest preventive trials. 相似文献