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   28469篇
  免费   558篇
  国内免费   5篇
  29032篇
  2021年   277篇
  2020年   421篇
  2019年   436篇
  2018年   709篇
  2017年   630篇
  2016年   645篇
  2015年   411篇
  2014年   542篇
  2013年   2330篇
  2012年   1076篇
  2011年   1114篇
  2010年   654篇
  2009年   627篇
  2008年   953篇
  2007年   871篇
  2006年   813篇
  2005年   717篇
  2004年   612篇
  2003年   598篇
  2002年   545篇
  2001年   856篇
  2000年   880篇
  1999年   636篇
  1998年   265篇
  1997年   239篇
  1996年   218篇
  1992年   516篇
  1991年   444篇
  1990年   512篇
  1989年   434篇
  1988年   407篇
  1987年   386篇
  1986年   399篇
  1985年   457篇
  1984年   352篇
  1983年   300篇
  1982年   232篇
  1979年   336篇
  1978年   266篇
  1976年   212篇
  1975年   307篇
  1974年   353篇
  1973年   357篇
  1972年   285篇
  1971年   252篇
  1970年   217篇
  1969年   237篇
  1968年   301篇
  1967年   257篇
  1966年   282篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
991.
    
There is a frequent need to measure the degree of agreement among R observers who independently classify n subjects within K nominal or ordinal categories. The most popular methods are usually kappa-type measurements. When = 2, Cohen's kappa coefficient (weighted or not) is well known. When defined in the ordinal case while assuming quadratic weights, Cohen's kappa has the advantage of coinciding with the intraclass and concordance correlation coefficients. When > 2, there are more discrepancies because the definition of the kappa coefficient depends on how the phrase ‘an agreement has occurred’ is interpreted. In this paper, Hubert's interpretation, that ‘an agreement occurs if and only if all raters agree on the categorization of an object’, is used, which leads to Hubert's (nominal) and Schuster and Smith's (ordinal) kappa coefficients. Formulae for the large-sample variances for the estimators of all these coefficients are given, allowing the latter to illustrate the different ways of carrying out inference and, with the use of simulation, to select the optimal procedure. In addition, it is shown that Schuster and Smith's kappa coefficient coincides with the intraclass and concordance correlation coefficients if the first coefficient is also defined assuming quadratic weights.  相似文献   
992.
993.
994.
    
There is a lack of evidence of effective and appropriate drug and alcohol treatment for Aboriginal and Torres Strait Islander peoples. This paper contributes to addressing the evidence gap by examining the feasibility and acceptability and conducting a pre/post-evaluation of the Aboriginal-adapted Community Reinforcement Approach (CRA) delivered in New South Wales, Australia. Aboriginal and non-Aboriginal clients (n = 55) received tailored CRA delivery between March and November 2013. Compared to the original US version, tailored CRA had reduced technical language, reduced number of treatment sessions, and the addition of group delivery option. An Australian training manual with local case studies was developed. Alcohol, Smoking and Substance Involvement Test (ASSIST), Kessler-5 (K-5) and the Growth Empowerment Measure were used. 58% of participants were followed-up at 3 months. Tailored CRA was feasible to deliver in a rural, community-based health setting, and rated by clients as highly effective and acceptable. CRA was associated with statistically significant reductions in the use of alcohol, tobacco, cannabis, amphetamine and over the counter medication, and levels of psychological distress, and an increase in levels of empowerment for Aboriginal and non-Aboriginal clients. This study provides evidence for the feasibility and acceptability of an Aboriginal-adapted psychological intervention addressing drug, alcohol and mental health outcomes.  相似文献   
995.
    
Loneliness is a significant public health issue that affects young adults. This investigation drew from interpersonal acceptance-rejection theory to understand how remembrances of parental rejection contributed to psychological maladjustment and loneliness in Bangladeshi college students (N = 300; 50% female). Students reported their remembrances of mothers' and fathers' acceptance-rejection, their current psychological maladjustment, and loneliness. Remembrances of rejection by parents in childhood were associated with psychological maladjustment (hostility/aggression, negative self-esteem, negative self-adequacy, emotional unresponsiveness, emotional instability, and negative worldview) for young adult men and women. Psychological maladjustment, in turn, was associated with feelings of loneliness in young adulthood for young men, but not women. Remembrances of parental rejection were also associated with greater hostility and aggression over and above general psychological functioning among both men and women. Findings are discussed in the context of different social and structural features of young adulthood for women and men in Bangladesh.  相似文献   
996.
    
A recent re-operationalisation of grandiose narcissism has resulted in the distinction of two narcissistic strategies based on the cognitive, affective-motivational and behavioural dynamics: admiration (assertive self-enhancement) and rivalry (antagonistic self-protection). The Narcissistic Admiration and Rivalry Questionnaire (NARQ) was developed to assess this model with two higher-order dimensions. However, cross-validations of the NARQ have not been extensively conducted across diverse population groups and languages. This study aimed to test the internal and external validity (through the relation with envy and self-esteem), reliability and cross-cultural equivalence of the Spanish version of the NARQ. The psychometric properties were evaluated in a Spanish sample (N = 310), and cross-cultural equivalence was tested in participants from Chile (N = 234) and Colombia (N = 256). The results supported the reliability and validity of the Spanish NARQ, as well as the cross-cultural equivalence across Spanish-speaking countries. In addition, we discuss obtained differences across Spanish, Chilean and Colombian sample within two narcissistic strategies.  相似文献   
997.
    
This study examined a moderated mediation model testing whether dysmorphic concern is related to behaviour altered to change appearance. This relationship is potentially mediated by depressive symptomatology (dysphoria and self-esteem) and ideas of reference about “laughing, commenting” and “attention, appearance,” and each mediated relationship moderated by sex. The sample was made up of 3377 adolescents from 12 to 18 years old (Mage = 14.52; SD = 1.65, 56.5% girls). The results showed that dysphoria and ideas of reference about “laughing, commenting” and “attention, appearance” partially mediated the relationship between dysmorphic concern and behavioural impairment related to body image. The relationship with dysphoria was moderated by sex, such that the mediation effect was stronger in girls than in boys. This result implies that girls who are worried about some characteristic of their appearance and show dysphoria are at greater risk of altered behaviour involving avoidance or controlling their appearance than boys. In addition, a possible risk of body dysmorphic disorder (3.45% of the sample) was found, with very prominent hiding behaviour using clothing or control behaviours, such as frequent weighing and looking at oneself in the mirror too much. Implications of these findings are discussed.  相似文献   
998.
    
Over 60 percent of Americans have some sort of family pet. Although studies have explored the personality and demographic correlates of pet ownership, none have considered whether religious characteristics may influence not only pet ownership, but the kind of pet Americans own. Drawing on data from the 2018 General Social Survey, we examine the religious antecedents of pet ownership in general as well as owning a cat or a dog, taking into account factors previously associated with owning certain pets (e.g., urban vs. rural residence, political affiliation). Although religious tradition and biblical literalism generally do not predict pet ownership, frequent worship attendees and the most conservative evangelicals report owning fewer pets. Religious characteristics also predict Americans’ ownership of particular pets. Most notably, we find a strong, negative association between worship attendance and cat ownership. We theorize potential mechanisms. On the one hand, certain personality types might simultaneously attract some Americans toward religious participation and away from pets, and cats in particular. Alternatively, to the extent that pet ownership is a partial substitute for human bonding and interaction, Americans more deeply embedded within a religious community may have less need (or time) for pets generally, and specifically more independent “roommate pets,” like cats.  相似文献   
999.
    
To what extent has the growth of Evangelicalism in Latin America contributed to political participation across the region? A number of scholars of religion and politics in the United States have suggested that Evangelicalism promotes the development of civic skills necessary for political engagement, while the Catholic Church, due to its hierarchical structure, provides fewer opportunities for skill acquisition. In this paper, we apply this debate to Latin America to test whether civic skills developed in Catholic and Protestant church activities lead to differential participation rates in 18 countries. We utilize the 2014 Pew Religion in Latin America survey to test these effects, and find that Protestant churches do indeed promote skill-developing activities at higher rates, but that Catholics, when involved, are more likely to translate this religious participation into political action. We conclude that political scientists must better understand the organizational role of religion in promoting political engagement worldwide.  相似文献   
1000.
    
The traditional recommendation for sequencing speaker and listener instruction has been to teach listener skills prior to teaching speaker skills. In a review of the research literature prior to 2011, Petursdottir and Carr (2011) concluded that research did not support this recommendation. We reviewed the most recent research on the efficiency of skill acquisition during speaker and listener instruction and found similar results to Petursdottir and Carr. Recommendations for future research and practice are provided.  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