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   6205篇
  免费   319篇
  国内免费   4篇
  6528篇
  2023年   66篇
  2022年   97篇
  2021年   122篇
  2020年   168篇
  2019年   152篇
  2018年   297篇
  2017年   298篇
  2016年   260篇
  2015年   178篇
  2014年   190篇
  2013年   804篇
  2012年   453篇
  2011年   455篇
  2010年   280篇
  2009年   192篇
  2008年   356篇
  2007年   286篇
  2006年   240篇
  2005年   250篇
  2004年   154篇
  2003年   165篇
  2002年   143篇
  2001年   68篇
  2000年   83篇
  1999年   50篇
  1998年   29篇
  1997年   30篇
  1996年   30篇
  1995年   23篇
  1994年   25篇
  1993年   27篇
  1992年   40篇
  1991年   28篇
  1990年   30篇
  1989年   27篇
  1988年   30篇
  1987年   22篇
  1985年   24篇
  1984年   24篇
  1983年   20篇
  1979年   24篇
  1978年   16篇
  1977年   16篇
  1976年   23篇
  1975年   20篇
  1974年   14篇
  1972年   13篇
  1970年   15篇
  1968年   14篇
  1965年   13篇
排序方式: 共有6528条查询结果,搜索用时 0 毫秒
991.
This article describes the changes in the religious landscape in Africa – on both the Christian and the Muslim sides – using the example of Cameroon, with the objective of determining the eventual implications that these changes can have for social peace in Africa. The country has seen a shift from planned and controlled evangelization and Islamization carried out by recognized political and religious authorities, to evangelization and Islamization done by individuals who, even though they represent religious currents recognized around the world, act autonomously. The religious landscape has consequently changed fundamentally on the geographical level: moving from the usual cleavage between the Christian South and the Muslim North to a total breakdown in ethno‐regional religious territories. The same thing can be observed for various Christian denominations, which are no longer confined to their historic ethno‐regional territories. Religious organizations are now set up in an anarchic manner. All of this is taking place in a fragile local and regional environment which could, as argued here, present a genuine threat to social peace in Cameroon.  相似文献   
992.
An isokinetic-related parameter termed the difference between eccentric-concentric strength ratios at two distinct test velocities (DEC) based on 60° (standard) range of motion (RoM) has been proven to be highly efficient detecting feigned muscular efforts. This study aimed to verify whether a DEC derived from a much shorter test RoM (20°) was equally useful than a long RoM–derived one. Eighteen healthy men (32.4 ± 6.4 years old) took part in a study focusing on shoulder external rotation isokinetic strength. Participants performed a genuine shoulder external rotator maximal effort (eight pairs of concentric and eccentric contractions at high and low velocities at short and long RoM) and then instructed to feign maximal effort. Contraction velocities were adjusted accordingly by applying a 1:4 gradient and peak moments registered. Both condition DEC was then calculated by subtracting the eccentric and concentric strength ratios at low velocities from those at high velocities. DEC scores in the feigned effort were significantly higher than maximal effort ones in both conditions in men. It enabled the setting of specific cutoff levels for separating the efforts. Both approaches revealed a coincident sensitivity (78%) whereas short RoM showed an even higher specificity: 88% versus 78%. Thus, the short RoM protocol provides clinically acceptable detection power.  相似文献   
993.
994.
The theory of direct learning (D. M. Jacobs &; C. F. Michaels, 2007 Jacobs, D. M., &; Michaels, C. F. (2007). Direct learning. Ecological Psychology, 19, 321349.[Taylor &; Francis Online], [Web of Science ®] [Google Scholar]) has proven useful in understanding improvement in perception and exploratory action. Here the authors assess its usefulness for understanding the learning of a motor skill, bimanual tapping at a difficult phase relation. Twenty participants attempted to learn to tap with 2 index fingers at 2 Hz with a phase lag of 90° (i.e., with a right-right period of 500 ms and a right-left period of 125 ms). There were 30 trials, each with 50 tapping cycles. Computer-screen feedback informed of errors in both period and phase for each pair of taps. Participants differed dramatically in their success. Learning was assessed by identifying the succession of attractors capturing tapping over the experiment. A few participants’ attractors migrated from antiphase to 90° with an appropriate period; others became attracted to a fixed right-left interval, rather than phase, with or without attraction to period. Changes in attractor loci were explained with mixed success by direct learning, inviting elaboration of the theory. The transition to interval attractors was understood as a change in intention, and was remarkable for its indifference to typical bimanual interactions.  相似文献   
995.
The study aimed to develop a French version of the Functional Assessment of Chronic Illness Therapy—Spiritual Well-being short version (FACIT-Sp12), in order to provide a self-reported measure for French people in the field of gerontology. The study involving 63 nursing home residents was conducted to evaluate the construct validity, reliability, and convergence validity of the FACIT-Sp12. A confirmatory factor analysis corroborated a three-factor model (Meaning, Peace and Faith) with modifications for two items, also valid among people with cognitive impairment. Subscales showed good internal consistency and are correlated with quality of life and depression. In conclusion, the validated French version is an suitable instrument to study the maintenance and promotion of quality of life in the elderly.  相似文献   
996.
This study investigated the impact of ostracism (vs. inclusion) for women in a same-sex vs. opposite-sex group on their cognitive performances. Female participants played Cyberball with other women or men and were either included or excluded. Participants then had to engage in the performance tasks. Results showed that women’s performance was decreased by ostracism in a math task (but not a verbal task) yet only in the same-sex condition. Furthermore, this result was obtained only among participants who did the numeric task first. No effect was observed in the verbal task. Two replications of the initial study were conducted using the math task. The result of the first study has been replicated one time. A meta-analysis revealed a small effect of ostracism on performance in the ingroup condition, whereas the effect seems to be non-existent in the outgroup condition. Results are discussed and future perspectives are proposed.  相似文献   
997.
Due to gender socialization, girls are more likely to endorse self-transcendence values (e.g., helping people) compared to boys, whereas boys are more likely to endorse self-enhancement values (e.g., wanting to be in charge) compared to girls. In two studies, we investigated teachers’ judgment regarding the display of these values in school and students’ endorsement of the self-transcendence and self-enhancement values in two contexts: home and school. In Study 1 (N = 240), teachers evaluated a student perceived as strongly endorsing the self-transcendence values more positively compared to a student perceived as strongly endorsing the self-enhancement values, regardless of the student’s gender. In Study 2 (N = 151), boys endorsed the self-enhancement values more than the self-transcendence values at home, whereas the opposite occurred in the school context. Girls did not vary across contexts, endorsing the self-transcendence values more than the self-enhancement values in both contexts. Possible consequences on boys’ school-related outcomes are discussed.  相似文献   
998.
The Hebb repetition effect (Hebb, 1961) occurs when recall performance improves for a list that is repeated during a serial-recall task. This effect is considered a good experimental analogue to language learning. Our objective was to evaluate the role of overt language production in language learning by manipulating recall direction during a Hebb repetition paradigm. In each trial, seven nonsense syllables were presented auditorily. Participants had to orally recall the items either in the presentation order or in reverse order. One sequence was repeated every third trial. In Experiment 1, we compared learning from a group that had recalled the items in their presentation order to learning from a group that had recalled the items in the reverse order. The two groups yielded similar learning rates. In Experiment 2, recall direction was varied between trials. The learning rate was not affected when recall direction varied between trials, suggesting a limited role of overt language production in language learning.  相似文献   
999.
1000.
Facial expressions of anger and fear have been seen to elicit avoidance behavior in the perceiver due to their negative valence. However, recent research uncovered discrepancies regarding these immediate motivational implications of fear and anger, suggesting that not all negative emotions trigger avoidance to a comparable extent. To clarify those discrepancies, we considered recent theoretical and methodological advances, and investigated the role of social preferences and processing focus on approach-avoidance tendencies (AAT) to negative facial expressions. We exposed participants to dynamic facial expressions of anger, disgust, fear, or sadness, while they processed either the emotional expression or the gender of the faces. AATs were assessed by reaction times of lever movements, and by posture changes via head-tracking. We found that—relative to angry faces-, fearful and sad faces triggered more approach, with a larger difference between fear and anger in prosocial compared to individualistic participants. Interestingly, these findings are in line with a recently developed concern hypothesis, suggesting that—relative to other negative expressions—expressions of distress may facilitate approach, especially in participants with prosocial preferences.  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