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   3184篇
  免费   149篇
  2023年   22篇
  2021年   23篇
  2020年   48篇
  2019年   66篇
  2018年   75篇
  2017年   79篇
  2016年   110篇
  2015年   72篇
  2014年   71篇
  2013年   408篇
  2012年   131篇
  2011年   146篇
  2010年   90篇
  2009年   93篇
  2008年   111篇
  2007年   154篇
  2006年   121篇
  2005年   124篇
  2004年   107篇
  2003年   99篇
  2002年   109篇
  2001年   63篇
  2000年   65篇
  1999年   52篇
  1998年   44篇
  1997年   47篇
  1996年   38篇
  1995年   55篇
  1994年   36篇
  1993年   32篇
  1992年   42篇
  1991年   28篇
  1990年   38篇
  1989年   23篇
  1988年   29篇
  1987年   35篇
  1986年   24篇
  1985年   16篇
  1984年   29篇
  1983年   29篇
  1982年   38篇
  1981年   24篇
  1980年   26篇
  1979年   21篇
  1978年   29篇
  1977年   22篇
  1976年   22篇
  1975年   24篇
  1974年   28篇
  1968年   14篇
排序方式: 共有3333条查询结果,搜索用时 62 毫秒
911.
912.
With the advent and widespread use of the Internet, various online media are being used to connect and maintain social relationships in individuals of all ages. Social relationships are vital to healthy development, and individuals with social and/or dating anxiety may have marked difficulty in establishing appropriate, supportive relationships because of fear of negative evaluation by others. For these individuals, the Internet may open avenues of communication and provide an outlet through which relationships can be formed and preserved. This study investigated the characteristics of computer and Internet use in young adults to determine whether individuals who were high in social/dating anxiety symptoms were more likely to make and maintain social relationships online. To further understand the patterns of these behaviors, several measures of social and dating anxiety were collected and analyzed along with demographic, computer use, and relationship characteristics. Results indicated differences between high and low social/dating anxiety with respect to media use and relationship formation. Limitations and future directions are discussed.  相似文献   
913.
Many of the same fundamental principles and regulations that govern civilian biomedical research also apply to research conducted by the US Military. Despite these similarities, the conduct of research by the US Military has additional requirements designed to preserve service members' informed consent rights, ethical standards and information that may be deemed classified. Furthermore, there are also additional rules and regulations associated with potential research to be done in a combat setting. Before conducting battlefield research, many unique circumstances must be considered to include: (1) the current legal and regulatory requirements for advanced informed consent (2) the tactical situations, and the ability to adequately document in the "austere" environment (3) the need to provide improved drugs and devices for combat casualty care and (4) the special nature of the superior-subordinate relationship. This paper discusses historical background, regulatory oversight, ethical implications and release of information as it pertains to research conducted by the US Military.  相似文献   
914.
The benefits of expanding retrieval practice for preschool children were explored in two experiments. In Experiment 1, three groups learned names for six plush toy pigs using expanding retrieval practice, a reward incentive, or a control condition. Reward did not significantly improve learning but retrieval practice doubled recall. In Experiment 2, three groups learned names to soft toys, comparing recall following massed elaborative study with either expanding retrieval practice or expanding re-presentation. Recall was tested after 1 minute, 1 day, and 2 days. A very large effect size (d = 1.9) indicated the very considerable benefit from expanding retrieval practice over the elaboration condition. Comparison with the re-presentation condition suggested that half of the benefit of expanding retrieval practice came from spaced scheduling and half from retrieval practice. Expanding retrieval practice provides an effective method to improve learning by young children.  相似文献   
915.
We examined selective attention to threat stimuli as a function of individual differences in adult attachment. Participants completed a dot-probe task in which a general threat word, attachment-related threat word, general positive or attachment-related positive word was presented together with a neutral word. Results showed that attachment anxiety and avoidance were associated with an attentional bias away from attachment threat words. This attentional avoidance effect was best predicted by the interaction between attachment anxiety and avoidance and not by their unique main effects. The findings are discussed in terms of attachment theory and its relation to attentional biases observed in psychopathology.  相似文献   
916.
Berent I  Steriade D  Lennertz T  Vaknin V 《Cognition》2007,104(3):591-630
Are speakers equipped with preferences concerning grammatical structures that are absent in their language? We examine this question by investigating the sensitivity of English speakers to the sonority of onset clusters. Linguistic research suggests that certain onset clusters are universally preferred (e.g., bd>lb). We demonstrate that such preferences modulate the perception of unattested onsets by English speakers: Monosyllabic auditory nonwords with onsets that are universally dispreferred (e.g., lbif) are more likely to be classified as disyllabic and misperceived as identical to their disyllabic counterparts (e.g., lebif) compared to onsets that are relatively preferred across languages (e.g., bdif). Consequently, dispreferred onsets benefit from priming by their epenthetic counterpart (e.g., lebif-lbif) as much as they benefit from identity priming (e.g., lbif-lbif). A similar pattern of misperception (e.g., lbif-->lebif) was observed among speakers of Russian, where clusters of this type occur. But unlike English speakers, Russian speakers perceived these clusters accurately on most trials, suggesting that the perceptual illusions of English speakers are partly due to their linguistic experience, rather than phonetic confusion alone. Further evidence against a purely phonetic explanation for our results is offered by the capacity of English speakers to perceive such onsets accurately under conditions that encourage precise phonetic encoding. The perceptual illusions of English speakers are also irreducible to several statistical properties of the English lexicon. The systematic misperception of universally dispreferred onsets might reflect their ill-formedness in the grammars of all speakers, irrespective of linguistic experience. Such universal grammatical preferences implicate constraints on language learning.  相似文献   
917.
The authors examined siblings' dyadic and differential experiences of parental warmth from 7 to 19 years of age. Participants were first- and second-borns from 201 families who reported on their warmth with each parent in 4 home interviews spaced over 5 years. Supporting an individual development hypothesis, multilevel model analyses revealed declines in parental warmth from early through midadolescence but no changes or increases in warmth in middle childhood and later adolescence. Consistent with a learning-from-experience hypothesis, declines in paternal warmth were less pronounced for second-borns than for firstborns. The results also suggest gender intensification in differential warmth for parents of mixed-gender sibling dyads. Within-family comparisons of youth provide unique insights about family relationship development.  相似文献   
918.
We randomized, at two sites, 210 patients with Rome II diagnosed irritable bowel syndrome (IBS), of at least moderate severity, to one of three conditions: group-based cognitive therapy (CT; n=120), psychoeducational support groups (n=46) as an active control, or intensive symptom and daily stress monitoring (n=44). One hundred eighty-eight participants completed the initial treatment. Those in symptom monitoring were then crossed over to CT. For an intent to treat analysis on a composite GI symptom measure derived from daily symptom diaries, both CT and the psychoeducational support groups were significantly more improved than those in the intensive symptom monitoring condition, but the CT and psychoeducational support group did not differ. Among treatment completers on the same composite measure of GI symptoms, again, both CT and psychoeducational support groups were statistically superior to symptom monitoring but did not differ on the symptom composite, or on any other measure. On individual IBS symptoms, both CT and psychoeducational support were statistically superior to symptom monitoring on reductions in abdominal pain and tenderness and for flatulence. Patient global ratings at the end of treatment showed the two active conditions statistically superior to symptom monitoring on change in Bowel Regularity, with CT superior to symptom monitoring on reduction in overall pain and in improvement in sense of well-being. Three-month follow-up data on 175 patients revealed maintenance of significant improvement or continued significant improvement on all IBS symptoms, including the McGill Pain Questionnaire. Group CT and psychoeducational support groups continued not to differ on any measure. We thus conclude that group CT is not superior to an attention placebo control condition.  相似文献   
919.
920.
This study examined the role of values, affect, and deservingness judgments in health professionals' views of patients with stigmatized conditions (e.g., drug dependence). Participants were 277 nurses who responded to a survey containing 2 scenarios of a nurse providing high- or low-quality care to a patient with a condition related to prolonged use of alcohol or heroin. Affective responses to the patient were more positive for nurses with higher self-transcendence values, and more negative for nurses with higher conservation values. Deservingness judgments were predicted by positive and negative affect toward the patient, but not by attributions of responsibility for drug use. Deservingness judgments emerged as strong predictors of nurses' satisfaction with the provision of high- or low-quality care. The findings imply that the deservingness judgments made by nurses reflected strong entitlement norms concerning the provision of proper care for patients that were independent of patients' perceived responsibility for their condition.  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