全文获取类型
收费全文 | 2827篇 |
免费 | 82篇 |
国内免费 | 2篇 |
出版年
2021年 | 14篇 |
2020年 | 33篇 |
2019年 | 52篇 |
2018年 | 72篇 |
2017年 | 59篇 |
2016年 | 65篇 |
2015年 | 50篇 |
2014年 | 56篇 |
2013年 | 353篇 |
2012年 | 103篇 |
2011年 | 94篇 |
2010年 | 76篇 |
2009年 | 64篇 |
2008年 | 87篇 |
2007年 | 103篇 |
2006年 | 93篇 |
2005年 | 98篇 |
2004年 | 105篇 |
2003年 | 89篇 |
2002年 | 93篇 |
2001年 | 45篇 |
2000年 | 40篇 |
1999年 | 52篇 |
1998年 | 52篇 |
1997年 | 34篇 |
1996年 | 61篇 |
1995年 | 51篇 |
1994年 | 53篇 |
1993年 | 48篇 |
1992年 | 50篇 |
1991年 | 34篇 |
1990年 | 38篇 |
1989年 | 39篇 |
1988年 | 33篇 |
1987年 | 37篇 |
1986年 | 34篇 |
1985年 | 48篇 |
1984年 | 32篇 |
1983年 | 44篇 |
1982年 | 39篇 |
1981年 | 31篇 |
1980年 | 31篇 |
1979年 | 19篇 |
1978年 | 25篇 |
1977年 | 22篇 |
1976年 | 18篇 |
1975年 | 16篇 |
1974年 | 22篇 |
1973年 | 17篇 |
1971年 | 11篇 |
排序方式: 共有2911条查询结果,搜索用时 31 毫秒
921.
This study examined the role of comorbid anxiety in treatment outcome for children with mood disorders (N = 165; age 8–11) participating in Multi-Family Psychoeducational Psychotherapy (MF-PEP). Assessments occurred at baseline,
6, 12, and 18 months for two randomly assigned groups: immediate treatment and 1-year wait-list. Most children (69%) had comorbid
anxiety disorders. Baseline comorbid anxiety, as reported on the Children’s Interview for Psychiatric Syndromes (ChIPS), was
associated with higher Children’s Depression Rating Scale- Revised (CDRS-R) scores but not Young Mania Rating Scale (YMRS)
scores. Higher levels of anxiety symptoms were associated with lower Children’s Global Assessment Scale (C-GAS) scores. Participation
in MF-PEP did not significantly reduce anxiety symptoms (p = 0.62). However, presence of comorbid anxiety did not impede reduction in depressive (CDRS-R, p = 0.74) or manic (YMRS scores, p = 0.94) symptoms following MF-PEP. More baseline anxiety symptoms were associated with greater improvement in C-GAS scores
post-treatment (p = 0.02). Implications are discussed. 相似文献
922.
923.
Katherine L. Milkman Mary Carol Mazza Lisa L. Shu Chia-Jung Tsay Max H. Bazerman 《Organizational behavior and human decision processes》2012
Policies that would create net benefits for society that contain salient costs frequently lack enough support for enactment because losses loom larger than gains. To address this consequence of loss aversion, we propose a policy-bundling technique in which related bills involving both losses and gains are combined to offset separate bills’ costs while preserving their net benefits. We argue this method can transform unpopular individual pieces of legislation, which would lack the support for implementation, into more popular policies. Study 1 confirms that bundling increases support for bills with costs and benefits and that bundled legislation is valued more than the sum of its parts. Study 2 shows this finding stems from a diminished focus on losses and heightened focus on gains. Study 3 extends our findings to policies involving costs and benefits of the same type (e.g., lives) generated by different sources (e.g., food vs. fire safety). 相似文献
924.
Matthew P. Bradstreet Stephen T. Higgins Sarah H. Heil Gary J. Badger Joan M. Skelly Mary Ellen Lynch Molly C. Trayah 《决策行为杂志》2012,25(5):502-511
In this study, we examined the association between social discounting and smoking status in a cohort of pregnant cigarette smokers (n = 91), quitters (n = 27), or never‐smokers (n = 30). The smokers and quitters were participants in clinical trials on smoking cessation and relapse prevention, whereas the never‐smokers were controls in a study on nicotine withdrawal during pregnancy. Social discounting was assessed using a paper‐and‐pencil task that assesses the amount of hypothetical money a person is willing to forgo in order to share with individuals in their social network ranging from the person who is emotionally closest to them to a mere acquaintance. The amount that women were willing to forgo in order to share decreased hyperbolically as a function of social distance, with smokers exhibiting steeper discounting functions (i.e., less generosity) than quitters or never‐smokers; discounting functions of quitters and never‐smokers did not differ significantly. In multivariate analyses controlling for potential sociodemographic and other confounds, social discounting remained a significant predictor of smoking status among smokers versus quitters. Overall, these results suggest that individual differences in social discounting may be a factor influencing the choices that women make about quitting smoking upon learning of a pregnancy. Copyright © 2011 John Wiley & Sons, Ltd. 相似文献
925.
Our purpose in undertaking the present study was to examine the hypotheses proposed for explaining the frequent comorbidity of bipolar disorder and multiple sclerosis. One hypothesis posits that, when there is comorbidity, MS plays a causal role in psychiatric manifestations. Another suggests that both disorders have a common underlying physiological process that increases the likelihood of their co-occurrence. We examined two adult siblings with comorbidity and their relatives, including three generations of family members with psychiatric morbidity. We found an extensive multigenerational history of bipolar disorder in this family. This history would seem to support the hypothesis of a common underlying brain process (potentially genetically-based) to explain the comorbidity of BD and MS, but cannot clarify whether this comorbidity implies a relationship between the two disorders or merely reflects parallel processes of brain deterioration. We cannot, however, rule out the possibility of a subclinical MS-related process leading to the early manifestation of BD, with MS appearing much later in time, or even a third, undetermined factor, leading to familial comorbidity. Although we have insufficient information to support either hypothesis definitively, we present the familial cases as a springboard for a discussion of dilemmas related to teasing apart MS and BD comorbidity. Further observation of the clinical course of the younger family members, who have not yet shown any neurological signs, over the next few years may elucidate the current picture further. 相似文献
926.
Language and concepts are intimately linked, but how do they interact? In the study reported here, we probed the relation between conceptual and linguistic processing at the earliest processing stages. We presented observers with sequences of visual scenes lasting 200 or 250 ms per picture. Results showed that observers understood and remembered the scenes' abstract gist and, therefore, their conceptual meaning. However, observers remembered the scenes at least as well when they simultaneously performed a linguistic secondary task (i.e., reading and retaining sentences); in contrast, a nonlinguistic secondary task (equated for difficulty with the linguistic task) impaired scene recognition. Further, encoding scenes interfered with performance on the nonlinguistic task and vice versa, but scene processing and performing the linguistic task did not affect each other. At the earliest stages of conceptual processing, the extraction of meaning from visually presented linguistic stimuli and the extraction of conceptual information from the world take place in remarkably independent channels. 相似文献
927.
928.
Although a large body of research has examined the negative outcomes that occur when Latina adolescents engage in sexual activity, relatively little research explores the determinants that may contribute to these behaviors. In the current study, an ecological community psychological approach was used to examine the impact that substance use, sexual self-efficacy, parental communication, normative peer pressure, acculturation, educational aspirations, grades, and gang activity have on adolescent sexual behavior. The sample consisted of 217 participants (mean age of 14.6) who self-identified as Latina from the greater Los Angeles metropolitan area of California in the United States. The results indicate that about a third of the sample had engaged in one or more sexual behaviors. Overall, greater usage of substances was associated with greater numbers of sexual behaviors. Girls who reported engaging in two or more sexual behaviors reported more frequent marijuana and alcohol use. The girls who reported high sexual self-efficacy engaged in few to no sexual behaviors. Additionally, parental communication, normative peer pressure, acculturation, and educational aspirations were unrelated to their sexual behavior. However, the majority of girls who reported receiving good grades also reported no sexual activity. Moreover, girls who reported no sexual behavior also reported no gang activity. The results indicate that a multi-level approach to examining the psycho-social determinants of sexual activity in Latina girls provides a more comprehensive picture of their sexual decision making. 相似文献
929.
Reports an error in "Age of onset of marijuana use and executive function" by Staci A. Gruber, Kelly A. Sagar, Mary Kathryn Dahlgren, Megan Racine and Scott E. Lukas (Psychology of Addictive Behaviors, Advanced Online Publication, Nov 21, 2011, np). Figure 1 should have been presented in color. All versions of this article have been corrected. (The following abstract of the original article appeared in record 2011-27123-001.) Marijuana (MJ) remains the most widely abused illicit substance in the United States, and in recent years, a decline in perceived risk of MJ use has been accompanied by a simultaneous increase in rates of use among adolescents. In this study, the authors hypothesized that chronic MJ smokers would perform cognitive tasks, specifically those that require executive function, more poorly than control subjects and that individuals who started smoking MJ regularly prior to age 16 (early onset) would have more difficulty than those who started after age 16 (late onset). Thirty-four chronic, heavy MJ smokers separated into early and late onset groups, and 28 non-MJ smoking controls completed a battery of neurocognitive measures. As hypothesized, MJ smokers performed more poorly than controls on several measures of executive function. Age of onset analyses revealed that these between-group differences were largely attributed to the early onset group, who were also shown to smoke twice as often and nearly 3 times as much MJ per week relative to the late onset smokers. Age of onset, frequency, and magnitude of MJ use were all shown to impact cognitive performance. Findings suggest that earlier MJ onset is related to poorer cognitive function and increased frequency and magnitude of MJ use relative to later MJ onset. Exposure to MJ during a period of neurodevelopmental vulnerability, such as adolescence, may result in altered brain development and enduring neuropsychological changes. (PsycINFO Database Record (c) 2012 APA, all rights reserved). 相似文献
930.
W. Alex Mason Kevin P. Haggerty Andrew P. Fleming Mary Casey-Goldstein 《Journal of child and family studies》2012,21(6):891-905
Parental depression places offspring at elevated risk for multiple, co-occurring problems. The purpose of this study was to develop and preliminarily evaluate Project Hope, a family intervention for the prevention of both depression and substance use among adolescent-aged children (M?=?13.9?years) of depressed parents. The program was created by blending two empirically supported interventions: one for depression and another for substance use. Thirty families were randomly assigned to either Project Hope (n?=?16) or a wait-list control condition (n?=?14). Pretests, posttests (n?=?29), and 5-month follow-ups (n?=?28) were conducted separately with parents and youth via phone interviews. Questions asked about the family depression experience, family interactions, family management, coping, adolescent substance use beliefs and refusal skills, adolescent depression, and adolescent substance use. Project Hope was fully developed, manualized, and implemented with a small sample of targeted families. Engagement in the program was relatively high. Preliminary outcome analyses were conducted using 2 (Group) ×3 (Time) analyses of covariance. Results provided some evidence for significant improvements among intervention compared to control participants in indicators of the family depression experience, family management, and coping, and a statistically significant decrease from pretest to posttest in alcohol quantity for intervention compared to control youth. Next steps for this program of research are discussed. 相似文献