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   1890篇
  免费   95篇
  国内免费   1篇
  1986篇
  2023年   22篇
  2022年   31篇
  2021年   40篇
  2020年   55篇
  2019年   50篇
  2018年   114篇
  2017年   123篇
  2016年   94篇
  2015年   55篇
  2014年   50篇
  2013年   263篇
  2012年   119篇
  2011年   119篇
  2010年   90篇
  2009年   51篇
  2008年   111篇
  2007年   82篇
  2006年   71篇
  2005年   63篇
  2004年   55篇
  2003年   58篇
  2002年   38篇
  2001年   22篇
  2000年   19篇
  1999年   21篇
  1998年   7篇
  1997年   18篇
  1996年   9篇
  1995年   6篇
  1994年   13篇
  1993年   5篇
  1992年   12篇
  1991年   6篇
  1990年   5篇
  1989年   5篇
  1988年   4篇
  1987年   6篇
  1985年   10篇
  1984年   5篇
  1983年   4篇
  1981年   6篇
  1979年   3篇
  1978年   3篇
  1977年   3篇
  1974年   5篇
  1973年   3篇
  1972年   3篇
  1970年   3篇
  1968年   3篇
  1965年   3篇
排序方式: 共有1986条查询结果,搜索用时 15 毫秒
881.
The present study uses tip-of-the-tongue (TOT) states as a unique source of evidence to test the hypothesis of lexical access benefits for homophones--that is, whether low-frequency homophones, such as tee, inherit the lexical access benefits of their high-frequency homophonic counterparts, such as tea. We compared retrieval success rates for low-frequency homophones, for matched low-frequency controls, and for high-frequency controls with the combined frequency of the homophone set. In correct retrievals, low-frequency homophones behaved according to their specific frequency, not differing from the low-frequency controls. However, retrieval failures revealed a different kind of homophone effect. When retrieval failed for targets with a homophone partner, access difficulties tended to be less profound than for low-frequency controls, ending closer to target retrieval more often than low-frequency controls (at Step 2; in a self-resolved TOT or in a TOT with a strong feeling of knowing), and ending far away from target retrieval less often than low-frequency controls (at Step 1; in a notGOT). These results provide evidence against the notion of shared word-form representations for homophonic targets but leave open a door for a weaker form of homophone effects, possibly arising from feedback activation that influences retrieval only when access is sufficiently slowed (as when retrieval fails).  相似文献   
882.
There has been very little research in Spanish on the potential role of prosodic skills in reading and spelling acquisition, which is the subject of the present study. A total of 85 children in 5th year of Primary Education (mean age 10 years and 9 months) performed tests assessing memory, stress awareness, phonological awareness, reading and spelling. In written language tests, errors were classified as phonological (grapheme-to-phoneme conversion rules) or stress-related (placement of the stress mark). Regression analyses showed that, once memory and phonological awareness were controlled, stress awareness partially explained reading and spelling performance as well as error type; however, differences were found between reading and spelling errors. These results show a relationship between prosodic skills--namely stress sensitivity--and the acquisition of reading and spelling skills that seems to be independent of phonological awareness skills.  相似文献   
883.
Dominique Tournès 《Synthese》2012,186(1):257-288
Diagrams have played an important role throughout the entire history of differential equations. Geometrical intuition, visual thinking, experimentation on diagrams, conceptions of algorithms and instruments to construct these diagrams, heuristic proofs based on diagrams, have interacted with the development of analytical abstract theories. We aim to analyze these interactions during the two centuries the classical theory of differential equations was developed. They are intimately connected to the difficulties faced in defining what the solution of a differential equation is and in describing the global behavior of such a solution.  相似文献   
884.
This article presents the development of a junior version of the Spanish (Castilian) NEO Personality Inventory-Revised (JS NEO) suitable for adolescents aged 12 to 18 years. The psychometric properties of the new JS NEO were investigated using two samples of 2,733 and 983 adolescents in Spain. The results showed that the adult NEO-PI-R factor structure was replicated with the junior version of the inventory and that the reliabilities of the scales were adequate. The cross-form correlations between the junior and the adult versions of the questionnaires indicated good equivalence indices. Furthermore, a joint factor analysis of the JS NEO and the Big Five Questionnaire-Children (BFQ-C) provided additional evidence for the construct validity of the JS NEO.  相似文献   
885.
Since the 19th century, it has been known that response latencies are longer for naming pictures than for reading words aloud. While several interpretations have been proposed, a common general assumption is that this difference stems from cognitive word-selection processes and not from articulatory processes. Here we show that, contrary to this widely accepted view, articulatory processes are also affected by the task performed. To demonstrate this, we used a procedure that to our knowledge had never been used in research on language processing: response-latency fractionating. Along with vocal onsets, we recorded the electromyographic (EMG) activity of facial muscles while participants named pictures or read words aloud. On the basis of these measures, we were able to fractionate the verbal response latencies into two types of time intervals: premotor times (from stimulus presentation to EMG onset), mostly reflecting cognitive processes, and motor times (from EMG onset to vocal onset), related to motor execution processes. We showed that premotor and motor times are both longer in picture naming than in reading, although than in reading, although articulation is already initiated in the latter measure. Future studies based on this new approach should bring valuable clues for a better understanding of the relation between the cognitive and motor processes involved in speech production.  相似文献   
886.
Exercise induces brain function adaptations and improves learning and memory; however the time window of exercise effects has been poorly investigated. Studies demonstrate an important role for cyclooxygenase-2 (COX-2) pathway function in the mechanisms underlying memory formation. The aim of present work was to investigate the effects of treadmill exercise on aversive memory and COX-2, PGE(2) and E-prostanoid receptors contents in the rat hippocampus at different time points after exercise has ended. Adult male Wistar rats were assigned to non-exercised (sedentary) and exercised (running daily for 20min, for 2weeks) groups. The inhibitory avoidance task was used to assess aversive memory and the COX-2, PGE(2) and E-prostanoid receptors (EP1, EP2, EP3 and EP4) levels were determined 1h, 18h, 3days or 7days after the last training session of treadmill exercise. The step down latency in the inhibitory avoidance, COX-2 and EP4 receptors levels were acutely increased by exercise, with a significant positive correlation between aversive memory performance and COX-2 levels. Increased EP2 content decreased PGE(2) levels were observed 7days after the last running session. The treadmill exercise protocol facilitates inhibitory avoidance memory and induces time-dependent changes on COX-2 pathways function (COX-2, PGE(2) and EP receptors).  相似文献   
887.
Although France has just acquired a third generation bioethics law, the convention on bioethics that was held in the spring of 2009, as well as all the reports drawn up in France with a view to revising the 2004 bioethics law, raise questions about the process by which bioethics norms are formed. This is a consideration of the formation of the norm and its content. As for the formation of the norm, since the early 1980s, it can be seen that in France there has been a study of the place of the bioethic norm in the hierarchy of positive law. While the legislator's intervention was delayed in 1988 (in particular by the Braibant report), 2008 saw questions about the place of the Constitution in the process. Although the rl61e of the legislator emerged consolidated, at the same time the participation of the citizens by means of the convention is seen to be reinforced. The place of agencies, in particular the bioethics agency created in 2004, also has a great impact on the production of norms. Next, as far as the content is concerned, the debates on biomedical ethics for the last 30 years seem curiously to keep raising the same questions (post-mortem insemination, surrogate motherhood, presumed consent to organ donation...). This recurrence is interesting. Why can't France, or rather the French, manage to answer these questions once and for all? While our neighbours, in particular the United Kingdom and Spain, behave more serenely in this area (eg the giving up of anonymity for donated gametes in the UK), France is perpetually questioning, caught between the need to follow the evolution of our neighbours' norms and maintaining our more conservative position. On this point too the Convention and the life of the biomedicine agency make it possible to take stock of French social values which are growing stronger as the years go by. It is then tempting to draw a parallel with the founding texts of the French republic, and particularly the declaration of human rights in 1789 in order to find the place of man.  相似文献   
888.
The goal of this study was to analyze the recidivism rate in minor offenders to whom a minimum intervention measure was applied after their first felony or misdemeanor, and to determine the variables associated with recidivism. The sample was made up of 154 minors from the province of Santa Cruz of Tenerife (Canary Islands, Spain). The information was collected from the database of the Minors' Court. The recidivism rate depends on the measure imposed, ranging between 14 and 40.6%. The degree of agreement between the Technical Team's proposal and the court decision was 70%. With regard to the variables associated with recidivism, a model was obtained through logistic regression that correctly classified 83.7% of the cases, and was made up of the variables perception of parenting problems, intervention of social services, and social isolation.  相似文献   
889.
The objective of this study is to adapt and translate into Spanish Spreitzer's Psychological Empowerment Scale (1995a). A process of translation and reverse-translation was applied to the scale's items, whose psychometric properties were then examined using a sample of 272 professional nurses at public hospitals in the province of Seville. The data were subjected to confirmatory factor analysis. The significance of the factor loadings demonstrated the need to create a new model eliminating one item. The 11-item model was shown to possess adequate construct validity and internal consistency. The results confirm the original, four-factor structure obtained by Spreitzer, with the exception of item 10, and support the utilization of the Spanish version of this scale in the workplace. Future research should more extensively investigate its construct validity, and test the nomological network of the operationalized construct within the field of psychological well-being and in the context of the workplace.  相似文献   
890.
The purpose of the study was to validate two measures of muscle dysmorphia (MD) into the Italian language. The sample included three participant groups: (1) competing bodybuilders, (2) non-competing bodybuilders, and (3) non-bodybuilding controls. In general the Italian versions of the scales showed psychometric utility that is consistent with the original instruments. The severity of MD was greater for competing bodybuilders than non-competing bodybuilders and controls.  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