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   1117篇
  免费   17篇
  国内免费   20篇
  2023年   10篇
  2022年   32篇
  2021年   35篇
  2020年   44篇
  2019年   52篇
  2018年   99篇
  2017年   87篇
  2016年   87篇
  2015年   40篇
  2014年   39篇
  2013年   129篇
  2012年   38篇
  2011年   38篇
  2010年   38篇
  2009年   50篇
  2008年   50篇
  2007年   34篇
  2006年   29篇
  2005年   31篇
  2004年   15篇
  2003年   12篇
  2002年   5篇
  2001年   5篇
  2000年   11篇
  1999年   5篇
  1998年   6篇
  1997年   6篇
  1995年   10篇
  1994年   3篇
  1993年   10篇
  1992年   5篇
  1991年   3篇
  1990年   5篇
  1988年   5篇
  1987年   6篇
  1986年   3篇
  1985年   4篇
  1984年   3篇
  1983年   5篇
  1982年   13篇
  1981年   8篇
  1980年   6篇
  1979年   7篇
  1977年   5篇
  1976年   2篇
  1974年   4篇
  1973年   4篇
  1971年   3篇
  1970年   3篇
  1967年   2篇
排序方式: 共有1154条查询结果,搜索用时 15 毫秒
931.
This article examines the impact the oil boom has had on crime and disorder in North Dakota. Particular attention is paid to the methods used to analyze these impacts. Several quantitative analyses, including t-tests and regressions, were performed and critiqued. Overall, few significant relationships were found that could link the oil boom to increases in crime and disorder. In addition, this article introduces location quotients as an alternative method to examine crime and disorder in boomtown settings. The results suggest that the impact of the boom was localized in that different counties experienced differential crime and disorder impacts.  相似文献   
932.
This study is an examination of the links between adolescent suicidal ideation, life meaning, and the ways they spend their leisure time. The sample consisted of 450 students aged 15–18. Findings showed a significant negative correlation between suicidal ideation and sense of life meaning, encompassing factors such as age and gender. Adolescents with involvement in social activities demonstrated lower levels of suicidal ideation (total score), and lower levels of depression and anxiety, than the other two groups. The study discusses the research and practical implications of these findings. The findings suggest the possibility of establishing prevention, intervention, and therapy programs for adolescents based on life meaning.  相似文献   
933.
Disordered sleep is strongly linked to future depression, but the reasons for this link are not well understood. This study tested one possibility – that poorer sleep impairs emotion regulation (ER), which over time leads to increased depressive symptoms. Our sample contained individuals with a wide range of depression symptoms (current depression, N?=?54, remitted depression, N?=?36, and healthy control, N?=?53), who were followed clinically over six months and reassessed for changes in depressive symptom levels. As predicted, maladaptive ER mediated both cross-sectional and prospective relationships between poor sleep quality and depression symptoms. In contrast, an alternative mediator, physical activity levels, did not mediate the link between sleep quality and depression symptoms. Maladaptive ER may help explain why sleep difficulties contribute to depression symptoms; implications for interventions are discussed.  相似文献   
934.
Objective: To assess the effects of conscious and non-conscious processes for prediction of older adults’ physical activity (PA), we tested a dual-process model that integrated motivational (behavioural intention) and volitional (action planning and coping planning) processes with non-conscious, automatic processes (habit).

Method: Participants (N = 215) comprised community-dwelling older adults (M = 73.8 years). A longitudinal design was adopted to investigate direct and indirect effects of intentions, habit strength (Time 1), and action planning and coping planning (Time 2) on PA behaviour (Time 3). Structural equation modelling was used to evaluate the model.

Results: The model provided a good fit to the data, accounting for 44% of the variance in PA behaviour at Time 3. PA was predicted by intentions, action planning, and habit strength, with action planning mediating the intention-behaviour relationship. An effect of sex was also found where males used fewer planning strategies and engaged in more PA than females.

Conclusions: By investigating an integration of conscious and non-conscious processes, this study provides a novel understanding of older adults’ PA. Interventions aiming to promote PA behaviour of older adults should target the combination of psychological processes.  相似文献   

935.
The first dynamic interactions between hydrogen and the stress-induced reverse transformation have been investigated by performing an unloading test on a Ni–Ti superelastic alloy subjected to hydrogen charging under a constant applied strain in the elastic deformation region of the martensite phase. Upon unloading the specimen, charged with a small amount of hydrogen, no change in the behaviour of the stress-induced reverse transformation is observed in the stress-strain curve, although the behaviour of the stress-induced martensite transformation changes. With increasing amount of hydrogen charging, the critical stress for the reverse transformation markedly decreases. Eventually, for a larger amount of hydrogen charging, the reverse transformation does not occur, i.e. there is no recovery of the superelastic strain. The residual martensite phase on the side surface of the unloaded specimen is confirmed by X-ray diffraction. Upon training before the unloading test, the properties of the reverse transformation slightly recover after ageing in air at room temperature. The present study indicates that to change the behaviour of the reverse transformation a larger amount of hydrogen than that for the martensite transformation is necessary. In addition, it is likely that a substantial amount of hydrogen in solid solution more strongly suppresses the reverse transformation than hydrogen trapped at defects, thereby stabilising the martensite phase.  相似文献   
936.
The aims of the present study were to examine the factor validity of a new social behavior assessment - the Social Behavior Scale (SBS) - using exploratory (sample 1, n = 169) and confirmatory (sample 2, n = 127) factor analysis, and to test factor invariance across gender in a sample of Italian preschoolers. The concurrent validity of the SBS was examined with measures of peer nominations and observed interactions (sample 3, n = 277). Findings confirmed the three-factor structure of the SBS: Emotional Competence, Social Engagement and Aggressiveness. Multigroup analysis provided evidence of factor invariance across gender. Concerning concurrent validity, results confirmed a great association between teacher-rating SBS and the other concurrent measures.  相似文献   
937.
Autism spectrum disorders (ASD) are characterized by executive dysfunction, and working memory (WM) comprises one core component of executive function. Many studies have investigated WM impairments in individuals with ASD, however, a conclusive agreement has not been reached. The present study provided a meta-analytic review of WM impairments in individuals with ASD and evaluated potential moderating variables of this problem. Twenty-eight studies were included in this study, and the participants comprised 819 individuals with ASD and 875 healthy controls. A significant WM impairment (Cohen’s d?=??0.61) was identified in the individuals with ASD, however, this impairment was not associated with age. Results of moderation analyses showed that (a) spatial WM was more severely impaired than verbal WM and (b) the component of cognitive processing (maintenance vs. maintenance plus manipulation) did not affect the severity of WM impairments. These findings suggest that WM is impaired in individuals with ASD and may have implications for interventions related to WM impairments in these individuals.  相似文献   
938.
Background and objectives: Social support is one of the three strongest predictors of posttraumatic stress disorder (PTSD). In the present study, we aimed to assess the buffering power of overt socially supportive and unsupportive behaviors from the significant other, in a group with PTSD and a comparison group. Design and methods: A total of 46 individuals with PTSD and 42 individuals with obsessive-compulsive disorder (OCD) or panic disorder (PD) completed diagnostic interviews and an anxiety-oriented social interaction with a significant other. Heart rate of participants was continuously measured during this interaction and overt social behaviors from the significant other were recorded on videotape and coded using a validated system. Results: Changes in heart rate in PTSD participants correlated negatively with changes in overt socially supportive behaviors from their significant other (r from ?.36 to ?.50, p?<?.05), while changes in overt unsupportive social behaviors from their significant other did not yield any significant correlation (r from ?.01 to .05, p?>?.05). No such statistically significant association emerged in the group with OCD or PD (r from .01 to ?.27, p?>?.05). Conclusions: This study sustain the buffering power of overt supportive behaviors from the significant other on heart rate changes in PTSD.  相似文献   
939.
Given the mixed findings concerning self-determination theory in explaining adherence to exercise referral schemes (ERS), the present study attempted to examine whether autonomous motivation and psychological need satisfaction could predict ERS adherence. Participants referred to an 8-week ERS completed self-report measures grounded in self-determination theory and basic needs theory at baseline (N = 124), mid-scheme (N = 58), and at the end of the scheme (N = 40). Logistic regressions were used to analyse the data. Autonomous motivation measured at mid-scheme explained between 12 and 16% of the variance in ERS adherence. Autonomy, relatedness and competence measured at mid-scheme explained between 18 and 26% of the variance in ERS adherence. This model also explained between 18 and 25% when measured at the end of the scheme. The study found limited evidence for the role of autonomous motivation in explaining ERS adherence. Stronger support was found for the satisfaction of the three needs for autonomy, relatedness and competence in predicting ERS adherence. Future research should tap into the satisfaction of all three needs collectively to help foster ERS adherence.  相似文献   
940.
Traditionally, acts of civil disobedience are understood as a mechanism by which citizens may express dissatisfaction with a law of their country. That expression will typically be morally motivated, non-violent and aimed at changing their government’s policy, practice or law. Building on existing work, in this paper we explore the limits of one well-received definition of civil disobedience by considering the challenging case of the actions of animal activists at sea. Drawing on original interviews with advocates associated with Sea Shepherd, Greenpeace and Humane Society International we find that even if animal activists are morally motivated and civil, the transnational nature of their activity makes it difficult to assess their intention to bring about a change in law or public policy. This means that a civil disobedience defence may not be available to activists operating across international borders. This raises important questions about the usefulness of the civil disobedience concept within the context of a globalised world. We conclude that while the actions of some anti-whaling activists may not meet definitions of civil disobedience as conventionally understood, this says more about the narrow way in which that concept has been traditionally defined, than it does about the type of activity some anti-whaling activists have undertaken in the Southern Ocean. Finally, we argue that activists wishing to make a stand against whaling may have no choice but to act as global citizens because policy change within a single nation-state is unlikely to lead to the cessation of this inherently transnational activity.  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