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   6304篇
  免费   323篇
  国内免费   26篇
  6653篇
  2024年   14篇
  2023年   76篇
  2022年   108篇
  2021年   129篇
  2020年   168篇
  2019年   171篇
  2018年   307篇
  2017年   298篇
  2016年   271篇
  2015年   180篇
  2014年   204篇
  2013年   799篇
  2012年   466篇
  2011年   463篇
  2010年   285篇
  2009年   207篇
  2008年   361篇
  2007年   307篇
  2006年   281篇
  2005年   249篇
  2004年   156篇
  2003年   150篇
  2002年   149篇
  2001年   71篇
  2000年   96篇
  1999年   49篇
  1998年   31篇
  1997年   25篇
  1996年   24篇
  1995年   23篇
  1994年   21篇
  1993年   21篇
  1992年   36篇
  1991年   29篇
  1990年   29篇
  1989年   27篇
  1988年   38篇
  1987年   20篇
  1986年   14篇
  1985年   18篇
  1984年   23篇
  1983年   14篇
  1979年   22篇
  1978年   13篇
  1976年   17篇
  1974年   19篇
  1973年   13篇
  1972年   13篇
  1970年   14篇
  1968年   19篇
排序方式: 共有6653条查询结果,搜索用时 0 毫秒
281.
282.
This study broaches in a novel way the analysis of cognitive impairment characteristic of the early stages of Alzheimer's Disease (AD). Specifically, we attempt to determine the acoustic speech parameters that are sensitive to the onset of the disease, and their association with the language deficit characteristic of AD. Speech analysis was carried out on 21 elderly patients with AD using Praat software, which analyzes the acoustic components of speech. The data obtained were subjected to stepwise regression, using the overall scores obtained in the test as the criterion variable, and the scores on the frequency, amplitude and periodicity variables as predictors of performance. We found that the percentage of voiceless segments explains a significant portion of the variance in the overall scores obtained in the neuropsychological test. This component seems to be related mainly to the patient's ability in phonological fluency. This finding could permit the creation of a diagnostic test for AD through analysis of the acoustic speech parameters at very low cost in terms of both time and resources.  相似文献   
283.
As a result of studies examining factors involved in the learning process, various structural models have been developed to explain the direct and indirect effects that occur between the variables in these models. The objective was to evaluate a structural model of cognitive and motivational variables predicting academic achievement, including general intelligence, academic self-concept, goal orientations, effort and learning strategies. The sample comprised of 341 Spanish students in the first year of compulsory secondary education. Different tests and questionnaires were used to evaluate each variable, and Structural Equation Modelling (SEM) was applied to contrast the relationships of the initial model. The model proposed had a satisfactory fit, and all the hypothesised relationships were significant. General intelligence was the variable most able to explain academic achievement. Also important was the direct influence of academic self-concept on achievement, goal orientations and effort, as well as the mediating ability of effort and learning strategies between academic goals and final achievement.  相似文献   
284.
The reform of the tarification according to activity is now in place with a "T2A" rate said to be 100%, ie the hospitals are paid based on the national tariffs for a stay in hospital. The reform will continue with a list of stays for which, each year, a single tariff between the public sector and the private sector is applied. This single tariff results from the "inter-sector tariff convergence" policy which is applied.  相似文献   
285.
Accumulating evidence suggests that evening-type adolescents are exposed to a number of determinants that might have a negative impact on their health condition. Given that few studies have investigated the association between chronotype and quality of life measures in large samples of adolescents, the aim of this study was to assess the relationship between morningness-eveningness and health-related quality of life among 1600 adolescents (aged 12-16 years). Adolescents completed the Ve?u et Santé Per?ue de L'adolescent (VSP-A) and the Morningness-Eveningness Scale for Children (MESC). Girls and older adolescents reported worse health indicators and were more evening oriented. Evening-type adolescents obtained lower scores on vitality, physical and psychological well-being, body image, relations with parents, relations with teachers, school work and global health scale.  相似文献   
286.
The aim of this study was to analyse the screening utility of the Social Anxiety Screening Scale (SASS/EDAS) in a sample of 227 adolescents with social anxiety disorder and 156 Without it (14-17 years). Results showed that the EDAS subscales (Avoidance, Distress and Interference) scores were reliable in terms of internal consistency (alpha > .80). All the subscales discriminated between adolescents with and without the disorder. They also showed a positive and significant correlation with other empirically validated measures of social anxiety. The three subscales indicated relevant sensitivity (69.16-84.14%), specificity (63.46-66.03%) and areas under the curve (.74-.81%). Binary logistic regression analyses indicated the adequate predictive utility of EDAS subscales, with the Distress subscale as the best diagnostic predictor. The data provide empirical evidence of the usefulness of EDAS as a screener for adolescent social anxiety disorder in terms of reliability, convergent and discriminant validity, diagnostic accuracy and clinical usefulness.  相似文献   
287.
The law of bioethics reveals frequent confusion in the definition and role devolved to the law and ethics. The purpose of this paper is to illustrate some of these confusions.  相似文献   
288.
289.
In order to ascertain whether or not child pedestrians voluntarily take risks, a street-crossing task in an urban environment with vehicle traffic was administered individually to 80 children aged 10 years using a pedestrian simulator. The task, which was presented as a contest, consisted of attaining two objectives in a limited time. The subjects were divided into three conditions that differed only in the number of constraints that had to be taken into account in order to win the contest. The data show that the degree of urgency felt, measured by the amount of time taken, increased as the number of constraints increased. At the same time, the frequency of two of the risky behaviors (not using the pedestrian crossing, running across the road) increased, whereas the frequency of observation failures was independent of the condition. Not using the pedestrian crossing and running across the road were therefore deliberately taken risks, whereas observation failures can be attributed to a control deficit. The discussion includes suggestions for training.  相似文献   
290.
The present article offers a review of the literature evaluating work-life balance training (which includes work-family balance training). The research, spanning over 43 databases, allowed the identification of 17 pertinent peer-reviewed articles. The selected studies are analysed in light of their main characteristics (design, sample, intervention, outcomes, etc.). The analysis shows that the offering of work-life balance training benefits both employees and managers. The methodological presuppositions and limitations of the selected studies are then critically examined. Lastly, possible topics for further research, such as the importance of conducting comparative researches and of adopting quasi-experimental and experimental protocols, are suggested in manner of conclusion.  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