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   1457篇
  免费   61篇
  2024年   4篇
  2023年   10篇
  2022年   11篇
  2021年   19篇
  2020年   24篇
  2019年   30篇
  2018年   60篇
  2017年   49篇
  2016年   74篇
  2015年   48篇
  2014年   48篇
  2013年   176篇
  2012年   88篇
  2011年   89篇
  2010年   55篇
  2009年   40篇
  2008年   73篇
  2007年   61篇
  2006年   43篇
  2005年   48篇
  2004年   50篇
  2003年   53篇
  2002年   36篇
  2001年   29篇
  2000年   36篇
  1999年   11篇
  1998年   17篇
  1997年   15篇
  1996年   14篇
  1995年   6篇
  1994年   9篇
  1993年   4篇
  1992年   14篇
  1991年   10篇
  1990年   22篇
  1989年   17篇
  1988年   14篇
  1987年   11篇
  1986年   16篇
  1985年   13篇
  1984年   14篇
  1983年   10篇
  1982年   5篇
  1979年   7篇
  1978年   3篇
  1975年   3篇
  1974年   3篇
  1970年   3篇
  1968年   3篇
  1967年   3篇
排序方式: 共有1518条查询结果,搜索用时 15 毫秒
911.
The paper discusses problems inherent in the secularist project,by an examination of secularisms in India and China.Different motives,historical backgrounds,political situations and cultural considerat...  相似文献   
912.
This study compares and explains differences in perceptions of cardiovascular disease (CVD) risk and preventive behaviors in people with and without a known genetic predisposition to CVD. A cross-sectional study using two samples was performed. The first sample (genetic predisposition; n?=?51) consisted of individuals recently diagnosed with familial hypercholesterolemia (FH) through DNA testing. The second sample (no genetic predisposition; n?=?49) was recruited among patients with CVD-risk profiles based on family history of CVD, cholesterol levels, and blood pressure, registered at general practices. Participants filled out a postal questionnaire asking about their perceived risk, causal attributions (i.e. genetic and lifestyle), and about perceived efficacy and adoption of preventive behavior (i.e. medication adherence and adoption of a healthy diet and being sufficiently active). Perceived comparative risk, genetic attributions of CVD, and perceived efficacy of medication were higher in the "genetic predisposition" sample than in the "no genetic predisposition" sample. The samples did not differ on lifestyle attributions, efficacy of a healthy lifestyle, or preventive behavior. Individual differences in perceived risk, genetic attributions, perceived efficacy of medication, and adoption of a healthy lifestyle were best explained by family history of CVD. Our findings suggest that in people diagnosed with a single gene disorder characterized by a family disease history such as FH, family disease history may be more important than DNA information in explaining perceptions of and responses to risk.  相似文献   
913.
Due to the terrorist attacks of 9/11 and the anthrax letters of a few weeks later, the concept of dual use has spread widely in the life sciences during the past decade. This article is aimed at a clarification of the dual use concept and its scope of application for the life sciences. Such a clarification would greatly facilitate the work of policymakers seeking to ensure security while avoiding undesirable interventions of government in the conduct of science. The article starts with an overview of the main developments in life sciences in relation to dual use. This is illustrated by discussions on synthetic biology and dual use. The findings lead to a reconsideration of the dual use concept. An area in need of further attention is to what extent threats and intentions should have impact on the definition of dual use. Possible threats are analyzed against the background of the phenomenon of securitization of health care and life sciences: considering these sectors of society in security terms. Some caveats that should be taken into account in a dual use policy are described. An acceptable, adequate and applicable definition of the dual use concept could help researchers, universities, companies and policy makers. Such a definition should build upon, but go beyond, the view developed in the influential Fink-report, which concentrates on the so-called ??experiments of concern??, e.g. experiments that enhance the virulence of pathogens (National Research Council of the National Academies 2004) It will be argued that??in addition to these more technical aspects??a definition of dual use should include the aspect of threats and intentions.  相似文献   
914.
'Near-miss' outcomes (i.e., unsuccessful outcomes close to the jackpot) have been shown to promote gambling persistence. Although there have been recent advances in understanding the neurobiological responses to gambling near-misses, the psychological mechanisms involved in these events remain unclear. The goal of this study was to explore whether trait-related gambling cognitions (e.g., beliefs that certain skills or rituals may help to win in games of chance) influence behavioural and subjective responses during laboratory gambling. Eighty-four individuals, who gambled at least monthly, performed a simplified slot machine task that delivered win, near-miss, and full-miss outcomes across 30 mandatory trials followed by a persistence phase in extinction. Participants completed the Gambling-Related Cognitions Scale (GRCS; Raylu & Oei, 2004), as well as measures of disordered gambling (South Oaks Gambling Screen [SOGS]; Lesieur & Blume, 1987) and social desirability bias (DS-36; Tournois, Mesnil, & Kop, 2000). Skill-oriented gambling cognitions (illusion of control, fostered by internal factors such as reappraisal of losses, or perceived outcome sequences), but not ritual-oriented gambling cognitions (illusion of control fostered by external factors such as luck or superstitions), predicted higher subjective ratings of desire to play after near-miss outcomes. In contrast, perceived lack of self-control predicted persistence on the slot machine task. These data indicate that the motivational impact of near-miss outcomes is related to specific gambling cognitions pertaining to skill acquisition, supporting the idea that gambling near-misses foster the illusion of control.  相似文献   
915.
There is great variability in the degree to which children with attention deficit/hyperactivity disorder (ADHD) improve through behavioral treatments. This study investigates the influence of the dopamine transporter gene (SCL6A3/DAT1) on outcome of behavioral parent training (BPT). Study subjects were a subsample (n = 50, for whom DAT1 genotypes were available) of a randomized controlled BPT effectiveness study (N = 94) comparing BPT plus ongoing routine clinical care (RCC) versus RCC alone in referred children (4-12 years old) with ADHD. Treatment outcome was based on parent-reported ADHD symptoms and behavioral problems. Presence of 2 versus no or 1 DAT1 10-repeat allele served as moderator variable. Time × Treatment × Genotype effect was analyzed with repeated-measures analysis of variance, controlling for baseline medication status. Results indicate that DAT1 moderated treatment response (p = .009). In children with no or 1 DAT1 10-repeat allele, superior treatment effects of BPT + RCC compared with RCC alone were present (p = .005), which was not the case in children with 2 DAT1 10-repeat alleles (p = .57). Our findings suggest that genetic differences in DAT1 in children with ADHD influence their susceptibility to a behavioral intervention directed at shaping their environment through their parents. The role of the dopamine system in motivation and learning and in the aberrant sensitivity to reinforcement in children with ADHD may explain this moderating effect, given that the management of contingencies is typically addressed in BPT.  相似文献   
916.
Work–family conflict and enrichment are experiences that occur daily and have substantial consequences for employees, their families, and the organizations that employ them. The aim of the current review is to make a link between life and career stage, work and family conditions, and the work–family interface. The basic proposition is that life stages partly determine career development, and consequently the specific working conditions (job demands and job resources) and family conditions (family demands and family resources) that individuals are exposed to. As a result, the specific demands and resources in the work and family domains determine to what extent individuals experience that work and family are conflicting or enriching life domains. In this review we suggest that individuals in early adulthood will experience high inter‐role conflict and low facilitation due to high demands and low resources in both life domains, while individuals in late adulthood will experience the opposite pattern; that is, low conflict and high facilitation due to low demands and high resources in both domains. Individuals in middle adulthood will experience high work–family conflict but also high family–work facilitation due to the presence of high job demands and resources in both life domains. Integrating life and career stage perspectives and the experience of work–family interface is of notable practical utility because it provides a mechanism to make more informed decisions about the relative need for and corresponding benefits of work–family programs.  相似文献   
917.
We conducted a longitudinal study to investigate the relation between sleep experiences and dissociative symptoms in a mixed inpatient sample at a private clinic evaluated on arrival and at discharge 6 to 8 weeks later. Using hierarchical regression analyses and structural equation modeling, we found a link between sleep experiences and dissociative symptoms and determined that specifically decreases in narcoleptic experiences rather than insomnia accompany a reduction in dissociative symptoms. Although sleep improvements were associated with a general reduction in psychopathology, this reduction could not fully account for the substantial and specific effect that we found for dissociation. Our findings are consistent with Watson's (2001) hypothesis that disruptions in the sleep-wake cycle lead to intrusions of sleep phenomena into waking consciousness, resulting in dissociative experiences. Accordingly, sleep hygiene may contribute to the treatment or prevention of dissociative symptoms.  相似文献   
918.
Variability in strategy selection is an important characteristic of learning new skills such as mathematical skills. Strategies gradually come and go during this development. In 1996, Siegler described this phenomenon as "overlapping waves." In the current microgenetic study, we attempted to model these overlapping waves statistically. In addition, we investigated whether development in strategy selection is related to development in accuracy and to what degree working memory is related to both. We expected that children with poor working memory are limited in their possibilities to make the associations that are necessary to progress to more mature strategies. This limitation would explain the often-found relationship between working memory and mathematical abilities. To this aim, the strategy selection and accuracy of 98 children who were learning single-digit multiplication was assessed eight times on a weekly basis. Using latent growth modeling for categorical data, we confirmed Siegler's hypothesis of overlapping waves. Moreover, both the intercepts and the slopes of strategy selection and accuracy were strongly interrelated. Finally, working memory predicted both strategy selection and accuracy, confirming that working memory is related to mathematical problem solving in two ways because it influences both the maturity of strategy choice and the probability of making procedural mistakes.  相似文献   
919.
A dominant assumption in social science is that shared similarities are the foundation for social categorization and identification. Accordingly, heterogeneity should hinder social identity formation. This paper argues the opposite can also be true: in heterogeneous groups, strong social identities can be built on expressions of individuality (inductive social identity formation), instead of shared similarities (deductive social identity formation). Two experiments manipulate social identity formation (deductive vs. inductive social identity formation) and support this idea. Study 1 shows that in heterogeneous groups, inductive social identity formation can result in higher identification and perceived entitativity than deductive social identity formation. Study 2 manipulates heterogeneity and confirms that while deduction of a social identity fosters a strong sense of identification in homogeneous groups, in heterogeneous groups a strong sense of identification can be brought about through induction. This pattern is also visible in real within-group cooperation.  相似文献   
920.
Decisions and judgments made after deliberation can differ from expert opinion and be more regretted over time than intuitive judgments and decisions. We investigated a possible underlying process of this phenomenon, namely global versus local processing style. We argue that deliberation induces a local processing style. This processing style narrows conceptual attention and can have detrimental effects on judgment and decision-making. Study 1 showed that intuitive judgments of quality of modern paintings were more accurate than were more deliberate, reasoned judgments. Study 2 showed that local versus global processing style is associated with accuracy of quality judgments of paintings, and Study 3 replicated this finding with an experimental manipulation of processing style. Finally, Study 4 showed that the effect of intuitive versus deliberative decision mode on quality judgments of poems is mediated by processing style.  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