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   390篇
  免费   45篇
  国内免费   86篇
  2024年   1篇
  2023年   11篇
  2022年   11篇
  2021年   11篇
  2020年   19篇
  2019年   14篇
  2018年   24篇
  2017年   16篇
  2016年   17篇
  2015年   17篇
  2014年   16篇
  2013年   37篇
  2012年   26篇
  2011年   40篇
  2010年   25篇
  2009年   27篇
  2008年   34篇
  2007年   24篇
  2006年   30篇
  2005年   27篇
  2004年   19篇
  2003年   14篇
  2002年   7篇
  2001年   7篇
  2000年   6篇
  1999年   6篇
  1998年   1篇
  1996年   2篇
  1995年   3篇
  1994年   4篇
  1993年   2篇
  1992年   3篇
  1989年   2篇
  1988年   1篇
  1987年   2篇
  1986年   2篇
  1985年   2篇
  1983年   1篇
  1982年   3篇
  1981年   2篇
  1980年   2篇
  1979年   2篇
  1976年   1篇
排序方式: 共有521条查询结果,搜索用时 15 毫秒
221.
People with chronic illnesses are at increased risk of contracting COVID-19. Still, little is known about whether such an increased risk relates to COVID-19-related protective behaviors among those with chronic illness. This study compares the self-reported COVID-19 risky and protective behaviors—specifically physically distancing, handwashing, and having houseguests—of people (N = 936) (1) living with chronic illnesses or (2) cohabiting with someone with chronic illness to those who fall in neither category at the beginning of the COVID-19 pandemic (April 2020). Study results were mixed: people with a chronic illness were more likely to have had houseguests in the past 5 days and less likely to have increased their handwashing in response to the pandemic, but were also more likely to physical distance when outside the home. Those cohabiting with someone with a chronic illness were more likely to have had houseguests, but did not differ in other outcomes.  相似文献   
222.
泰国是当代上座部佛教的三大主力之一,佛教在该国有着重要的影响。本世纪初,泰国一直在进行政治与经济的改革,作为国家精神文明领域的佛教,也处于改革进程之中。泰国政府出于改革的需要,重新订立了僧伽法,利用佛教来维系民族统一,将僧伽置于国家官僚机构的框架之下,发起了一系列的净化佛教运动,这些措施曾对当代泰国佛教和社会发展起到了重要影响,成为一种比较典型的模式,尤其是在政治关系上,对今天的佛教发展仍有重要的参考意义。  相似文献   
223.
外伤性下肢畸形的12名患者,术前第三天和麻醉前,分别测量血压、心率和呼吸频率,同时用放射免疫分析法测定血浆、脑脊液中精氨酸加压素(AVP)的含量。实验结果表明,麻醉前收缩压、舒张压均显著升高,心率明显增快;AVP含量,血浆中降低,脑脊液中升高,两者呈负性相关(r_s=-0.656)。这提示心理性应激,可影响植物性神经系统活动,导致心血管功能的改变;加压素可能在心理性应激中发挥一定的作用。  相似文献   
224.
2004年重庆市新的医疗收费制度实行后,口腔科针对新的收费标准和口腔科治疗项目费用上涨的收费现实,坚持以病人为中心,一方面严格执行新的收费精神,同时采取各种灵活和变通的收费措施,为病人着想,尽可能减轻病人负担。两年多来的实践取得了良好的社会效益,获得病人和家属的好评。  相似文献   
225.
回顾了近20年来军事应激下的有关认知工效学研究,主要包括五部分:基本理论;应激对认知的影响;研究方法;处理应激的方法;总结。其中在研究方法中重点是对已有事故的分析,竞争性游戏和虚拟现实技术。在减少应激对认知不良影响的方法中值得注意的是:对抗应激人员的选拔、对人员的训练和能够对抗应激的人-机系统的开发。对于我军今后类似研究提供了思路和可能入手点  相似文献   
226.
227.
The effect of writing and reading training on preferred font type and size in low-vision students was evaluated in 35 children. An ophthalmologist confirmed low vision according to ICD-10-CM. Children identified the font type and size they could best read. The writing subtest of the Jebsen-Taylor Hand Function Test, read in 1 min., and legibility as measured by the number of readable written letters were used in evaluating the children. A writing and reading treatment program was conducted, beginning with the child's preferred font type and size, for 3 months, 2 days per week, for 45 min. per day at the child's school. Before treatment, the most preferred font type was Verdana; after treatment, the preferred font type and size changed. Students had gained reading and writing speed after training, but their writing legibility was not significantly better. Training might affect the preferred font type and size of students with low vision. Surprisingly, serif and sans-serif fonts were preferred about equally after treatment.  相似文献   
228.
Older adults perform much like younger adults on language. This similar level of performance, however, may come about through different underlying brain processes. In the present study, we evaluated age-related differences in the brain areas outside the typical language areas among adults using a category decision task. Our results showed that similar activation patterns were found in classical language processing areas across the three age groups although regional lateralization indices in Broca’s and Wernicke’s areas decreased with age. The greatest differences, however, among the three groups were found primarily in the brain areas not associated with core language functioning including the hippocampus, middle frontal gyrus, ventromedial frontal cortex, medial superior parietal cortex and posterior cingulate cortex. Therefore, the non-classical language areas may exhibit an age-related difference between three age groups while the subjects show a similar activation pattern in the core, primary language processing during a semantic decision task.  相似文献   
229.
Despite evidence documenting the negative consequences, psychological dating violence occurs frequently in adolescent dating relationships. No information exists on the trajectories that adolescents follow and their association to nonphysical peer violence. The sample comprised 624 randomly selected 6th graders. In yearly surveys from 6th through 12th grade, 550 of the 624 students reported dating at least twice during the 3 months prior to completing the survey. These students responded to questions about frequency of engagement in psychological dating violence perpetration and victimization. We used Proc TRAJ to identify developmental trajectories of behavior over time and generalized estimating equation models to examine the associations of the trajectories and peer aggression. Adolescents followed three distinct developmental trajectories related to psychological dating violence victimization and perpetration: low, increasing, and high. Based on the joint probabilities of victimization and perpetration, we identified four predominant groups: low victimization/low perpetration (LVLP; 36%), increasing victimization/increasing perpetration (40%), high victimization/high perpetration (HVHP; 15%), and increasing victimization/low perpetration (IVLP; 7%). The LVLP had significantly more boys and White students; the HVHP group had an even gender distribution and more African‐American students. For all groups, peer aggression decreased from Grade 6 to 12; students in the HVHP group reported the highest peer aggression, and students in the LVLP reported the lowest peer aggression. Findings suggest a strong, reciprocal relationship in the developmental trajectories of adolescents who experience and perpetrate psychological dating violence. Those highly engaged in these behaviors were also more likely to be violent toward peers. Aggr. Behav. 38:510‐520, 2012. © 2012 Wiley Periodicals, Inc.  相似文献   
230.
We examined gestural and verbal interactions in 226 mother-infant pairs from Mexican, Dominican, and African American backgrounds when infants were 14 months and 2 years of age, and related these interactions to infants' emerging skills. At both ages, dyads were video-recorded as they shared a wordless number book, a wordless emotion book, and beads and string. We coded mothers' and infants' gestures and language/vocalizations. Each maternal utterance was coded as referential (e.g. 'That's a bead') or regulatory (e.g. 'Put it there'). Mothers reported on infants' gestural, receptive, and productive vocabularies at 14 months, and infants were assessed on receptive language, expressive language, and action sequencing and imitation at 2 years of age. Mothers of the three ethnicities differed in their gesturing, distributions of the two types of language, and coupling of language and gestures. Mothers' ethnicity, language, and gestures were differentially associated with infants' 2-year skills. Mother-infant communicative interactions are foundational to infant learning and development, and ethnic differences in modes of early communication portend divergent pathways in the development of specific skills.  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