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   5741篇
  免费   119篇
  国内免费   1篇
  5861篇
  2024年   37篇
  2023年   54篇
  2022年   51篇
  2021年   68篇
  2020年   155篇
  2019年   168篇
  2018年   210篇
  2017年   211篇
  2016年   231篇
  2015年   145篇
  2014年   189篇
  2013年   640篇
  2012年   306篇
  2011年   286篇
  2010年   197篇
  2009年   192篇
  2008年   241篇
  2007年   223篇
  2006年   212篇
  2005年   194篇
  2004年   156篇
  2003年   124篇
  2002年   137篇
  2001年   83篇
  2000年   87篇
  1999年   63篇
  1998年   69篇
  1997年   43篇
  1996年   52篇
  1995年   35篇
  1994年   38篇
  1993年   36篇
  1992年   46篇
  1991年   66篇
  1990年   46篇
  1989年   43篇
  1988年   39篇
  1987年   41篇
  1986年   35篇
  1985年   33篇
  1982年   34篇
  1981年   42篇
  1979年   37篇
  1978年   34篇
  1977年   35篇
  1976年   33篇
  1975年   29篇
  1974年   29篇
  1973年   29篇
  1967年   27篇
排序方式: 共有5861条查询结果,搜索用时 0 毫秒
991.
992.
STEPPING UP TO MOTHERHOOD AMONG INNER-CITY TEENS   总被引:1,自引:0,他引:1  
This mixed-methods, context-oriented study explored transitions to motherhood among pregnant and newly parenting inner-city teenagers ( n = 80) attending an alternative public school. Additionally, a novel research approach was assessed. Using data from a 2-year psychotherapy trial, inductive content analyses of therapy sessions and post hoc interviews of clinicians were synthesized with questionnaires and other more traditional data sources to develop a strength-focused understanding of prominent life themes, as experienced by participants. Results suggested that, although few teens had planned to have a baby, a large majority were pleased to discover their pregnancies. A heightened sense of purpose emerged, connected with drastically increased safety-conscious behaviors. Still, public and familial alienation was common. Grandmothers and additional female mentors became central, and their support of the pregnancy was protective against teen mothers' depression. The research technique assessed in this study provided broad-ranging information with substantial validity and minimal time and expense.  相似文献   
993.
Life events as predictors of mania and depression in bipolar I disorder   总被引:1,自引:0,他引:1  
To date, few prospective studies of life events and bipolar disorder are available, and even fewer have separately examined the role of life events in depression and mania. The goal of this study was to prospectively examine the role of negative and goal-attainment life events as predictors of the course of bipolar disorder. One hundred twenty-five individuals with bipolar I disorder were interviewed monthly for an average of 27 months. Negative and goal-attainment life events were assessed with the Life Events and Difficulties Schedule. Changes in symptoms were evaluated using the Modified Hamilton Rating Scale for Depression and the Bech-Rafaelsen Mania Scale. The clearest results were obtained for goal-attainment life events, which predicted increases in manic symptoms over time. Negative life events predicted increases in depressive symptoms within regression models but were not predictive within multilevel modeling of changes in depressive symptoms. Given different patterns for goal attainment and negative life events, it appears important to consider specific forms of life events in models of bipolar disorder.  相似文献   
994.
The central question underlying this study revolves around how children process co-reference relationships—such as those evidenced by pronouns (him) and reflexives (himself)—and how a slowed rate of speech input may critically affect this process. Previous studies of child language processing have demonstrated that typical language developing (TLD) children as young as 4 years of age process co-reference relations in a manner similar to adults on-line. In contrast, off-line measures of pronoun comprehension suggest a developmental delay for pronouns (relative to reflexives). The present study examines dependency relations in TLD children (ages 5–13) and investigates how a slowed rate of speech input affects the unconscious (on-line) and conscious (off-line) parsing of these constructions. For the on-line investigations (using a cross-modal picture priming paradigm), results indicate that at a normal rate of speech TLD children demonstrate adult-like syntactic reflexes. At a slowed rate of speech the typical language developing children displayed a breakdown in automatic syntactic parsing (again, similar to the pattern seen in unimpaired adults). As demonstrated in the literature, our off-line investigations (sentence/picture matching task) revealed that these children performed much better on reflexives than on pronouns at a regular speech rate. However, at the slow speech rate, performance on pronouns was substantially improved, whereas performance on reflexives was not different than at the regular speech rate. We interpret these results in light of a distinction between fast automatic processes (relied upon for on-line processing in real time) and conscious reflective processes (relied upon for off-line processing), such that slowed speech input disrupts the former, yet improves the latter.  相似文献   
995.
Action video game playing has been experimentally linked to a number of perceptual and cognitive improvements. These benefits are captured through a wide range of psychometric tasks and have led to the proposition that action video game experience may promote the ability to extract statistical evidence from sensory stimuli. Such an advantage could arise from a number of possible mechanisms: improvements in visual sensitivity, enhancements in the capacity or duration for which information is retained in visual memory, or higher-level strategic use of information for decision making. The present study measured the capacity and time course of visual sensory memory using a partial report performance task as a means to distinguish between these three possible mechanisms. Sensitivity measures and parameter estimates that describe sensory memory capacity and the rate of memory decay were compared between individuals who reported high evels and low levels of action video game experience. Our results revealed a uniform increase in partial report accuracy at all stimulus-to-cue delays for action video game players but no difference in the rate or time course of the memory decay. The present findings suggest that action video game playing may be related to enhancements in the initial sensitivity to visual stimuli, but not to a greater retention of information in iconic memory buffers.  相似文献   
996.
Even with the lack of consensus on the nature of an argument, the thesis that explanations and arguments are distinct is near orthodoxy in well-known critical thinking texts and in the more advanced argumentation literature. In this paper, I reconstruct two rationales for distinguishing arguments from explanations. According to one, arguments and explanations are essentially different things because they have different structures. According to the other, while some explanations and arguments may have the same structure, they are different things because explanations are used for different purposes than arguments. I argue that both rationales fail to motivate a distinction between arguments and explanations. Since these are the only rationales for distinguishing arguments from explanations that I am prepared to take seriously, I don’t see why we should exclude explanations from being arguments.  相似文献   
997.
Introduction A great volume of popular literature produced by Islamists strives to demonstrate the universal validity of the Islamic political principles and their applicability in any time and place. Although there is an agreement on certain characteristics of a government in a Muslim society, the debate reflects quite varied interpretations and some essential theoretical differences. The controversy stems largely from the conditions that scholars live in. Regarding the revived interest in creating a state based on Islamic political and moral guidelines, it is possible to encounter various interpretations and different standpoints. For instance, one point of view asserts that ‘the undemocratic nature of Islamic political ideology, popularised in the present times by fundamentalist ideologues, commends it to regimes which have no popular support and need to find some measure of legitimacy’ (Tibi, 1998). With the failure of man-made ideologies and withdrawal of imperialist western powers, according to another standpoint, the inhabitants of the Third World countries were led to revitalise their own sociopolitical values and institute their own political systems. In the case of the Islamic world, the idea of a state based on Islamic political principles, envisaged in the latter perspective, is ’the rekindling of the typical Islamic political ethos‘; in that Islam unifies the spiritual and social realms, it is therefore impossible to divorce politics from religion (Sulaiman, 1987). There is a wide range of contributions and critiques on the issue of Islamic principles guiding the constitutional aspects of a state, particularly since the Iranian Revolution in 1979. The interest in this matter has increased since the terrorist attacks in the USA on 11 September 2001, coinciding with a rising interest in such issues as Islamic social order and so-called Islamic terrorism. Nevertheless, most of these writings are popular and sensational; analytical studies are few. This article aims to fill the gap in scholarly inquiry into such an important matter by exploring the political ideas of major contemporary Muslim thinkers, and by identifying some essential characteristics for a state based on Islamic political principles in the light of the views of these scholars.  相似文献   
998.
In this study, we investigated gender differences in problem solving as a function of problem context and expectations for success. Subjects were 90 women and 56 men from introductory psychology classes who were administered a set of mathematical problems varying in gender context under male-expectancy, female-expectancy, and neutral-expectancy conditions. No significant gender differences or interaction of gender with problem context were found. However, significant effects of problem context and expectancy were found. Both male and female subjects made higher scores on female-context problems and lower scores in the female-expectancy condition. When mathematics aptitude was used as a covariate, an interaction of gender with expectancy was found. Men in the female-expectancy condition made significantly lower scores than either men or women in the male-expectancy condition.  相似文献   
999.
ABSTRACT

As more people move to urban areas there will be increased pressure on existing green spaces to offer places for recreation, contemplation, historic interpretation, exercise, and nature appreciation. Development and a rise in population has led to too few public recreation sites available in many regions of the world resulting in unsustainable pressure being applied to parks. The objective of this study was to examine how place attachment may be related to type and frequency of park use and management issues regarding crowding. Data for this study were obtained via intercept survey of a random sample of visitors (N = 1088) at a park in the Metro Atlanta area, Georgia. Results suggest that place attachment had a significant relationship with frequency of visits and types of activities that visitors engaged in. There was, however, no significant relation between place attachment and crowding. First-time visitors and less frequent visitors felt most crowded, which may support the idea that the most frequent visitors expect it to be crowded and are, therefore, less sensitive to it. This study sheds light on how visitors to an urban park view their experience while recreating, and may inform policies and regulations that will help mitigate the unique management situations that urban parks present.  相似文献   
1000.
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