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   5186篇
  免费   1514篇
  6700篇
  2024年   4篇
  2023年   15篇
  2022年   18篇
  2021年   96篇
  2020年   123篇
  2019年   427篇
  2018年   349篇
  2017年   469篇
  2016年   458篇
  2015年   404篇
  2014年   374篇
  2013年   776篇
  2012年   384篇
  2011年   316篇
  2010年   305篇
  2009年   272篇
  2008年   292篇
  2007年   219篇
  2006年   199篇
  2005年   190篇
  2004年   170篇
  2003年   158篇
  2002年   168篇
  2001年   101篇
  2000年   88篇
  1999年   60篇
  1998年   34篇
  1997年   30篇
  1996年   17篇
  1995年   13篇
  1994年   20篇
  1993年   8篇
  1992年   21篇
  1991年   11篇
  1990年   6篇
  1989年   3篇
  1988年   4篇
  1987年   10篇
  1986年   9篇
  1985年   4篇
  1984年   8篇
  1983年   3篇
  1982年   3篇
  1981年   8篇
  1980年   5篇
  1979年   6篇
  1978年   8篇
  1977年   6篇
  1976年   4篇
  1970年   4篇
排序方式: 共有6700条查询结果,搜索用时 36 毫秒
141.
This study examined, in a sample of recently immigrated Hispanic adolescents in Miami and Los Angeles, the extent to which bicultural identity integration (BII; involving the ability to synthesise one's heritage and receiving cultural streams and to identify as a member of both cultures) is best understood as a developmental construct that changes over time or as an individual‐difference construct that is largely stable over time. We were also interested in the extent to which these trajectories predicted mental health and family functioning. Recent‐immigrant 9th graders (N = 302) were assessed 6 times from 9th to 12th grade. Latent class growth analyses using the first 5 timepoints identified 2 trajectory classes—one with lower BII scores over time and another with higher BII scores over time. Higher heritage and US identity at baseline predicted membership in the higher BII class. At the 6th study timepoint, lower BII adolescents reported significantly poorer self‐esteem, optimism, prosocial behaviour and family relationships compared with their higher BII counterparts. These findings are discussed in terms of further research on the over‐time trajectory of biculturalism, and on the need to develop interventions to promote BII as a way of facilitating well‐being and positive family functioning.  相似文献   
142.
143.
We tested a strategy to encourage cigarette smokers to think more frequently about the negative consequences of smoking, reasoning that increased thought might lead to greater worry and motivation to quit. College students who smoked daily were randomly assigned to one of three conditions in which they wore watches for one week that sounded an alarm randomly four times each day. When alerted, the students read one of eight cards that either had a written statement about studying (control condition), a statement about the negative effects of smoking behaviour (text condition), or a negative smoking statement accompanied by a picture (e.g., a blackened lung; image condition). Measures collected at week's end revealed that the smoking cards had no effects on perceived risk, but they increased worry and reports of intrusive thoughts, and had a small but reliable effect on plans to quit. Correlational data also supported the relationship between worry and motivation to quit, and we discuss the possible benefits of “normal” worrying and strategies for capitalising on the worry–motivation relationship to encourage smokers to abandon cigarettes.  相似文献   
144.
This article explores the ontological nature of musical versions. I assume the widespread view that type/token ontologies offer the best explanation of the repeatable nature of works of music. However, I show that traditional type/token theories, which distinguish only between two levels of objects, face two problems when applied to the phenomenon of musical versions. First, they are not able to accommodate the familiar intuition of our musical practices that the work versioned is repeated in its versions’ performances. Second, they are not able to distinguish between two different phenomena of our practices: the phenomenon of a work's versions and the phenomenon of works inspired by, or derived from, other works. These undesirable consequences are entailed, under traditional two‐level type/token theories, by the nature of types as ontologically thin entities. I defend that the hypothesis of nested types, a multiple‐level type/token theory, can avoid these two problems while preserving the theoretical virtues of traditional two‐level type/token theories and structural monism—the most widely shared view about the individuation of musical works, according to which musical works are individuated by one, and only one, sound structure.  相似文献   
145.
In two studies, we tested a model in which the perceived (in)compatibility of being British and Muslim (identity incompatibility) was expected to mediate between group‐based discrimination and the identifications and attitudes of British Muslims. In Study 1 (N = 76), anti‐Muslim discrimination was associated with lower national identification and more negative attitudes toward non‐Muslims, and these relationships were mediated by perceived identity incompatibility. In Study 2 (N = 70), we additionally found that anti‐Muslim discrimination predicted stronger endorsement of Islamic group rights, and this relationship was also mediated by perceived identity incompatibility. The studies highlight the importance of group‐based discrimination in shaping the perceived (in)compatibility of being British and Muslim, and, in turn, the identifications and attitudes of British Muslims.  相似文献   
146.
Incentives are a popular method to achieve desired employee performance; however, research on optimal incentive magnitude is lacking. Behavioral economic demand curves model persistence of responding in the face of increasing cost and may be suitable to examine the reinforcing value of incentives on work performance. The present use‐inspired basic study integrated an experiential human operant task within a crowdsourcing platform to evaluate the applicability of behavioral economics for quantifying changes in workforce attrition. Participants included 88 Amazon Mechanical Turk Workers who earned either a $0.05 or $0.10 incentive for completing a progressively increasing response requirement. Analyses revealed statistically significant differences in breakpoint between the two groups. Additionally, a novel translation of the Kaplan‐Meier survival‐curve analyses for use within a demand curve framework allowed for examination of elasticity of workforce attrition. Results indicate greater inelastic attrition in the $0.05 group. We discuss the benefits of a behavioral economic approach to modeling employee behavior, how the metrics obtained from the elasticity of workforce attrition analyses (e.g., P max) may be used to set goals for employee behavior while balancing organizational costs, and how economy type may have influenced observed outcomes.  相似文献   
147.
There are today a variety of patterns in the different cantons of Switzerland for regulating the teaching of RE. The Swiss system is based on a cooperation between Church and state which varies in relation to the history and character of the differing cantons. This allows for diversity in modes of delivering RE. In two cantons there is complete separation between church and state whereas in the majority there is some form of cooperation. State recognized religious communities (normally the Swiss Reformed and Roman Catholic Churches, but in Basel the Old Catholic Church and Jewish community also) are in charge of the RE in schools where it is taught by their representatives visiting the schools. Where state related RE is taught this is done by teachers in the school employed by the state. The presence of Turkish immigrants is raising problems for the teaching of RE in certain areas since Islam has not been traditionally state recognized. However, the inherent diversity of patterns within the 26 cantons allows considerable room for innovation feasible because there is generally an openness between the churches and from the state which facilitates this.  相似文献   
148.
When evaluating frequency selectivity, it is difficult to determine if the deviation from normal performance observed for hearing-impaired listeners reflects abnormal cochlear function or normal, level-dependent changes in frequency selectivity. This experiment was designed to investigate the dependence of frequency-selectivity measures on threshold and signal level. Auditory-filter characteristics, critical ratios, forward-masked psychophysical tuning curves, and narrowband-noise masking patterns were obtained from normal-hearing listeners in quiet and in the presence of broadband noise at five levels. These findings were then compared to previously obtained frequency-selectivity measurements for subjects with mild-to-moderate sensorineural hearing loss whose absolute thresholds are comparable to the normal-hearing listeners' masked thresholds. The results suggest that frequency selectivity deterioriates as threshold increases for all subjects. However, the poor frequency selectivity exhibited by hearing-impaired listeners may not be explained entirely by the effects of threshold and signal level. Nevertheless, because frequency selectivity is poorer in the normal auditory system at higher stimulus levels, the deviation from normal performance observed for hearing-impaired listeners may not be as large as previously suggested.  相似文献   
149.
150.
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