全文获取类型
收费全文 | 7829篇 |
免费 | 265篇 |
国内免费 | 6篇 |
专业分类
8100篇 |
出版年
2020年 | 82篇 |
2019年 | 94篇 |
2018年 | 138篇 |
2017年 | 147篇 |
2016年 | 169篇 |
2015年 | 126篇 |
2014年 | 132篇 |
2013年 | 786篇 |
2012年 | 273篇 |
2011年 | 279篇 |
2010年 | 184篇 |
2009年 | 217篇 |
2008年 | 281篇 |
2007年 | 317篇 |
2006年 | 282篇 |
2005年 | 257篇 |
2004年 | 253篇 |
2003年 | 300篇 |
2002年 | 272篇 |
2001年 | 113篇 |
2000年 | 109篇 |
1999年 | 133篇 |
1998年 | 105篇 |
1997年 | 116篇 |
1996年 | 115篇 |
1995年 | 125篇 |
1994年 | 97篇 |
1993年 | 118篇 |
1992年 | 105篇 |
1991年 | 91篇 |
1990年 | 80篇 |
1989年 | 80篇 |
1988年 | 89篇 |
1987年 | 99篇 |
1986年 | 82篇 |
1985年 | 92篇 |
1984年 | 115篇 |
1983年 | 122篇 |
1982年 | 110篇 |
1981年 | 105篇 |
1980年 | 111篇 |
1979年 | 108篇 |
1978年 | 117篇 |
1977年 | 108篇 |
1976年 | 120篇 |
1975年 | 91篇 |
1974年 | 95篇 |
1973年 | 89篇 |
1972年 | 59篇 |
1971年 | 46篇 |
排序方式: 共有8100条查询结果,搜索用时 8 毫秒
951.
Robert M Gray Catherine M Jordan Richard S Ziegler Ronald B Livingston 《Child neuropsychology》2002,8(1):41-51
Neuropsychological data are reviewed from two sets of dizygotic twins presenting with selective mutism characterized by situation specific anxiety, extreme passive behavior, lack of responsivity, lack of peer interaction, and a chronic course of selective mutism. Both sets of twins had a history of prematurity and delayed speech development. One set of twins presented with normal intelligence and normal receptive language skills but with expressive language and oral motor sequencing difficulties. The second set of twins presented with Verbal IQ deficits and significant receptive and expressive language deficits. A summary of current conceptualizations regarding etiology and treatment of selective mutism is provided. 相似文献
952.
Richard C. Nemanick Jr Eddie M. Clark 《International Journal of Selection & Assessment》2002,10(3):206-217
This study examines the effects that extracurricular activities have on the attributions a résumé reader makes about an applicant. Three characteristics of extracurricular activities (number of activities, holding positions of leadership, and relevance of the activities) were manipulated across 24 résumés of fictitious college graduates. Some 219 raters read the résumés and made judgments about the level of the applicant’s quality. The results showed a main effect for the number of activities, a main effect for holding leadership positions, and a main effect for relevance of the activity. Furthermore, a three–way interaction revealed the differential effects that the relevance of the activities had on the attributions at different levels of leadership and number of activities. A mix of career–related and social activities garnered higher ratings for those who held leadership positions in five activities. However, for those who were leaders in only two activities or were not leaders in five, having only career–related activities earned them higher ratings. For applicants who were not leaders in two activities, relevance of the activities played no role. 相似文献
953.
954.
Richard Falk 《The Journal of Ethics》2002,6(4):311-352
This article explores the structure of world order fromthe perspective of the Treaty of Westphalia, which is treated asthe benchmark for the emergence of the modern system of sovereignstates. Emphasis is placed on Westphalia as historical event, ideaand ideal, and process of evolution, and also on developments thatsupersede this framing of world politics, especially, globalizationand the megaterrorist challenge of September 11, 2001. At issue is whether the state system is resilient enough to adapt to new globalconditions or is in the process of being supplanted, and whether thesequel to Westphalia is moving toward humane global governance orsome dysutopic variant, or both at once. 相似文献
955.
What are the prospects for consumerism? Often despised as self‐indulgent, consumers are frequently motivated by altruism and their needs to express their identity, to build relationships, to obtain fulfilment and even to find a substitute for religion. Mass‐customisation is producing fundamental change, revolutionising attitudes to choice, with a key role for agents (human and online) in helping people choose. Consumer power will grow and brands will be under pressure from rising consumer expectations. While retailers fight back with targeted marketing and special offers, brands will need to serve consumer needs as much as suppliers. Online shopping could transform consumer behaviour, driven by cost saving and convenience and spurred on by competition. Will retailers protect their traditional channels or go online because they are afraid not to? ‘Etailing’ will need to create consumer trust, so regulation will be critical, possibly leading to legal responsibilities for quality on Internet service providers (ISPs) and portals and with systems to help new entrants build a track record of reliability, thereby increasing competition, choice and consumer power. Copyright © 2002 Henry Stewart Publications. 相似文献
956.
957.
Kevin D Beck Richard J Servatius 《Integrative Physiological and Behavioral Science》2003,38(3):179-188
Many studies have alluded to sexually dimorphic changes in behavior following stress. Although many have suggested that these changes are a function of stress-induced changes in learning and memory, there are questions regarding whether performance in those learning and memory tasks are influenced by stress-induced changes in drive more than in actual learning and memory processes. We used the classically conditioned eyeblink response (CCER) to determine whether slowed learning following stress in females can be explained by changes in unconditional response (UR) amplitude, a sign of a stress-induced shift in sensory reactivity. In addition, we had a second treatment group injected with the pro-inflammatory cytokine IL-1beta to serve as an interoceptive stress condition, a physiological stressor with minimal stimulation to the animal. Replicating the work by Shors and colleagues, we found that stressed female rats had slower acquisition of the conditioned response (CR), but we also found that an IL-1beta injection leads to a slowing of CR acquisition. However, in both cases, UR amplitude was lower in the treatment groups. We followed up these results by testing sensory reactivity through the acoustic startle response (ASR), where the magnitude of the ASR was marginally, but nonsignificantly, reduced by the same dose regimen of IL-1beta. Together, these experiments suggest that tailshock stress and immune signaling (IL-1beta) reduce sensory reactivity and the saliency of the stimuli used in the CCER, leading to slower learning in female rats. 相似文献
958.
Basic response–event relations can be difficult to demonstrate with individuals with profound multiple impairments who participate in adaptive switch programs. Numerous variables that impede learning and contribute to performance variability present challenges to assessment methods. As switch use may be the only operant under stimulus control with some individuals, however, improvement in assessment methods and measurement technology is important. In three case studies, response–event relations were examined in individuals who were provided with an adaptive switch that could activate an electronic leisure device. With two individuals, evidence of learning was assessed in a novel alternating‐treatments design. Switch use was compared under conditions in which switch closures produced activation and conditions in which closures deactivated the device. With the remaining individual, the effects of momentary activation by switch closure were compared to timed activation. Data were collected with a combination of data collection technologies. Whole‐session rate and response‐duration data provided some evidence of learning in all participants. Data also were converted into within‐session cumulative graphs, which aided data interpretation. The results demonstrate advances in assessment of learning in people with profound multiple impairments. Copyright © 2003 John Wiley & Sons, Ltd. 相似文献
959.
Alessandra M. Passarotti Brianna M. Paul Joseph R. Bussiere Richard B. Buxton Eric C. Wong Joan Stiles 《Developmental science》2003,6(1):100-117
Although a few developmental fMRI studies have shed some light on the neurological development of either object or spatial processing we still know very little about the development of the ‘what’ and ‘where’ processing systems. The present study is the first to address this issue by comparing, concurrently and within the same behavioral paradigm, patterns of functional activation for face processing and location processing in 12 children (10–12 years old) and 16 adults. For both tasks this study found a developmental shift from a more distributed pattern of activation in children to a more focused pattern of activation in adults. Furthermore, the type of developmental redistribution of activation in children varied depending on the task. The present findings have important implications for theories of visuospatial development. They suggest that the neural systems involved in face and location processing may undergo development and fine‐tuning well into late childhood. 相似文献
960.
Cumberland-Li Amanda Eisenberg Nancy Champion Claire Gershoff Elizabeth Fabes Richard A. 《Motivation and emotion》2003,27(1):27-56
The purpose of this study was to test relations between parental temperamental emotionality and regulation or related personality characteristics and parental behavior, children's regulation, and children's social functioning. Mothers and fathers reported on their own personality and/or temperament and expressivity in the family (mothers only); parents and teachers rated children (71 girls and 99 boys; M age = 73 months) on their temperamental regulation, social competence, and problem behavior. Mothers also were observed interacting with their child, and behavioral measures of children's regulation were obtained. In general, high parental regulation and low negative emotionality were associated with positive developmental outcomes in children and more positive parental behaviors, and mothers' expression of positive emotion in the family mediated some of the relations of their dispositions to children's socioemotional functioning. 相似文献