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   5542篇
  免费   660篇
  国内免费   361篇
  2024年   18篇
  2023年   173篇
  2022年   99篇
  2021年   155篇
  2020年   306篇
  2019年   341篇
  2018年   354篇
  2017年   370篇
  2016年   346篇
  2015年   234篇
  2014年   221篇
  2013年   1101篇
  2012年   152篇
  2011年   169篇
  2010年   127篇
  2009年   171篇
  2008年   247篇
  2007年   274篇
  2006年   240篇
  2005年   204篇
  2004年   163篇
  2003年   147篇
  2002年   132篇
  2001年   105篇
  2000年   92篇
  1999年   72篇
  1998年   53篇
  1997年   69篇
  1996年   62篇
  1995年   47篇
  1994年   46篇
  1993年   29篇
  1992年   22篇
  1991年   17篇
  1990年   14篇
  1989年   7篇
  1988年   10篇
  1987年   7篇
  1985年   13篇
  1984年   17篇
  1983年   11篇
  1982年   16篇
  1981年   13篇
  1980年   13篇
  1979年   18篇
  1978年   12篇
  1977年   14篇
  1976年   10篇
  1975年   13篇
  1974年   9篇
排序方式: 共有6563条查询结果,搜索用时 46 毫秒
231.
Although reactivation and reinstatement reminders differ procedurally, differences in their memory-preserving effects have been described as artifactual. In three experiments, we examined this conclusion. One hundred and twelve 6-month-olds learned an operant task, forgot it, received a reactivation or reinstatement reminder to recover the inactive memory, and were tested after increasing delays until they forgot it again. In Experiments 1a and 1b, a single reactivation reminder extended infants' memory of an operant mobile task for 2 weeks after reminding, but a single reinstatement extended it for 4 weeks, when testing was discontinued. In Experiment 2, a single reinstatement extended 6-month-olds' memory of an operant train task for 19 weeks after reminding, when infants were almost 1 year old. After reactivation, infants remember this task for only 2 weeks. The finding that the memory-preserving effect of reinstatement is greater by an order of magnitude suggests that procedural differences between the two reminders have functional significance.  相似文献   
232.
This article reviews some of our recent functional magnetic resonance imaging (fMRI) studies of stuttering. Using event-related fMRI experiments, we investigated brain activation during speech production. Results of three studies comparing persons who stutter (PWS) and persons who do not stutter (PWNS) are outlined. Their findings point to a region in the right frontal operculum (RFO) that was consistently implicated in stuttering. During overt reading and before fluency shaping therapy, PWS showed higher and more distributed neuronal activation than PWNS. Immediately after therapy differential activations were even more distributed and left sided. They extended to frontal, temporal, and parietal regions, anterior cingulate, insula, and putamen. These over-activations were slightly reduced and again more right sided two years after therapy. Left frontal deactivations remained stable over two years of observation, and therefore possibly indicate a dysfunction. After therapy, we noted higher activations in persons who stutter moderately than in those who stutter severely. These activations might reflect patterns of compensation. We discuss why these findings suggest that fluency-inducing techniques might synchronize a disturbed signal transmission between auditory, speech motor planning, and motor areas.

Educational objectives: The reader will learn about and be able to: (1) identify regions of brain activations and deactivations specific for PWS; (2) describe brain activation changes induced by fluency shaping therapy; and (3) discuss the correlation between stuttering severity and brain activation.  相似文献   

233.
The economy is one of the most important social environments that affect well-being, and community psychologists have long studied the social costs of one key economic stressor—job loss. But economically inadequate employment has received much less research attention than unemployment in regard to mental health effects. This paper contrasts these two literatures and considers factors that might account for their differential growth including actual rates of unemployment and underemployment. Recent panel studies offer no support for another possible basis for this differential growth—the assumption that inadequate employment is more like adequate employment than unemployment. Implications of a paradigm shift from a dichotomous perspective (employment vs. unemployment) to a continuum perspective with variations of both unemployment and employment are discussed for research and prevention. Another implication is the need to expand standard labor force statistics to reflect better the degree of underemployment.  相似文献   
234.
This study investigated the acoustic characteristics of voicing in English fricative consonants produced by anterior aphasics and the effects of phonetic context on these characteristics. Three patients produced voiced and voiceless fricative-vowel syllables in isolation, following a voiced velar stop, and following a voiceless velar stop. Acoustic analyses were conducted of the amplitude and patterning of glottal excitation, as well as fricative noise duration. Results showed that, although the patients are able to coordinate the articulatory gestures for voicing in fricative consonants, they demonstrated abnormal patterns of glottal excitation in the amplitude measures, owing to weaker amplitudes of glottal excitation in voiced fricatives. Context effects failed to emerge because of dysfluent speech. These results suggest that the locus of the speech production deficit of anterior aphasics is not at the higher stages of phoneme selection or planning but rather in articulatory implementation, one related to laryngeal control.  相似文献   
235.
The purpose of this study, using an online methodology, was to investigate therapists' perceptions of the role of creativity in couples' and family therapy. Along with completing a quantitative measure assessing creativity in their work, participants responded to four open-ended questions which addressed the meaning of creativity, characteristics of a creative family therapist, some creative interventions they have used with couples and families, and barriers to their own creativity as a family therapist. A total of 142 marriage and family therapists in 36 states in the United States participated. The findings shed light on the unique importance of creativity in couples and family treatment.  相似文献   
236.
《孔丛子》六卷当出自“汉魏孔氏家学” ,其前三卷记孔子、子思言行 ,可能是辑先秦孔氏遗文。《孔丛子·记义》篇载有一大段孔子对《诗》的评论 ,其与上博简《孔子诗论》有着内在的关系 ,可以将它们视为同一个体系而相互参释和补充。《孔丛子》“诗论”与上博简《诗论》都反映了先秦儒家早期说诗的风格和内容 ,而与汉代形成的《诗序》传统不同。《孔丛子》“诗论”对朱熹的《诗经集传》有一定影响 ,在从汉代诗学向宋代诗学的转变过程中起了一定的作用。  相似文献   
237.
健全社区卫生服务功能与防控"非典"传播的理性思考   总被引:1,自引:0,他引:1  
针对我国当访“非典”防治工作的严竣形势,对健全社区卫生服务“六位一体”功能与防控“非典”传播问题进行哲学思考,着重在健全社区卫生服务功能是防控“非典”传播的客观要求;社区卫生服务功能不全将会对防控“非典”工作产生不利影响;构筑防控“非典”传播的有效机制和基础防线,必须健全社区卫生服务功能等方面作了分析论述。  相似文献   
238.
The papers in this special issue of Clinical Child and Family Psychology Review provided an overview of what is known about children's exposure to domestic violence, and include indications of gaps in extant research. These gaps and research needs are summarized in this conclusion. Specifically, there is need for further research in several broad areas: definition and measurement of children's exposure to domestic violence; development of research methods and statistical designs that provide detailed information and provide for evidence of intervention effectiveness; impact of domestic violence on parenting and family functioning; the role of child factors and exposure to violence factors in predicting developmental risk and resilience; medical and health consequences of exposure to violence; and the nature of child-system interaction in response to domestic violence. Research needs in these areas are discussed in greater detail, and specific questions are raised for further development.  相似文献   
239.
In this editorial contribution, two issues relevant to the question, what should be at the top of the research agenda for ethics and technology, are identified and discussed. Firstly: can, and do, engineers make a difference to the degree to which technology leads to morally desirable outcomes? What role does professional autonomy play here, and what are its limits? And secondly, what should be the scope of engineers' responsibility; that is to say, on which issues are they, as engineers, morally obliged to reflect? The research agendas proposed by the authors contributing to this special section, implicitly, give different answers to these questions. We suggest that an explicit discussion of these issues would greatly help in constructing a common research agenda.  相似文献   
240.
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