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   5643篇
  免费   502篇
  国内免费   49篇
耳鼻咽喉   45篇
儿科学   146篇
妇产科学   119篇
基础医学   491篇
口腔科学   133篇
临床医学   740篇
内科学   983篇
皮肤病学   87篇
神经病学   816篇
特种医学   94篇
外科学   398篇
综合类   193篇
一般理论   6篇
预防医学   1243篇
眼科学   64篇
药学   444篇
中国医学   23篇
肿瘤学   169篇
  2024年   12篇
  2023年   115篇
  2022年   68篇
  2021年   228篇
  2020年   262篇
  2019年   288篇
  2018年   255篇
  2017年   249篇
  2016年   272篇
  2015年   209篇
  2014年   271篇
  2013年   812篇
  2012年   253篇
  2011年   219篇
  2010年   214篇
  2009年   218篇
  2008年   240篇
  2007年   225篇
  2006年   244篇
  2005年   203篇
  2004年   185篇
  2003年   177篇
  2002年   155篇
  2001年   117篇
  2000年   94篇
  1999年   81篇
  1998年   89篇
  1997年   76篇
  1996年   53篇
  1995年   63篇
  1994年   32篇
  1993年   36篇
  1992年   32篇
  1991年   30篇
  1990年   19篇
  1989年   12篇
  1988年   9篇
  1987年   10篇
  1986年   5篇
  1985年   10篇
  1984年   11篇
  1983年   2篇
  1982年   7篇
  1981年   7篇
  1980年   8篇
  1979年   2篇
  1978年   2篇
  1977年   6篇
  1976年   2篇
  1975年   5篇
排序方式: 共有6194条查询结果,搜索用时 15 毫秒
61.
62.
63.
64.
65.
This study examined the association between positive and negative aspects of spouse responses and psychological adjustment among 15S individuals with cancer. Two contextual variables, gender and disease-related functional impairment, were taken into account when examining the association between spouse responses and patient psychological distress and well-being. Results indicated that negative aspects of close relationships played a comparatively stronger role than positive aspects in their associations with both psychological distress and well-being. For negative spouse responses, patient gender did not moderate the effects of these responses upon psychological outcomes. For positive aspects of spouse support, both gender and functional disability moderated the association between spouse support and psychological outcomes. These findings are integrated with the general literature on positive and negative aspects of close relationships. Implications for clinical interventions are also discussed.  相似文献   
66.
University students blind to group status rated boys with gender identity disorder and clinical control boys regarding their physical attractiveness. Ratings were made of the face and upper torso from photographs taken at the time of clinical assessment ( age, 8.1 years). On all five adjectives (attractive, beautiful, cute, handsome, and pretty), boys with gender identity disorder were judged to be more attractive than were the clinical control boys. Attractiveness correlated with extent of behavioral femininity in the clinical control group, but not in the group of boys with gender identity disorder. The extent to which the group differences in attractiveness were due to objective, structural differences in facial attractiveness vs. socially created, or subjective, processes is discussed.A version of this article was presented at the meeting of the International Academy of Sex Research, Sigtuna, Sweden, August 1990.  相似文献   
67.
Synaptic plasma membranes were prepared from superior frontal gyrus and motor cortex obtained at autopsy from 17 chronic alcoholics not differentiated on thiamine status, of whom 8 had pathologically confirmed cirrhosis of the liver, and 10 controls. Three of the cirrhotic alcoholic cases were female, as was one control. Cases were closely matched for age at death and post-mortem delay. The affinity of central-type benzodiazepine sites for [3H]diazepam tended to be lower in both brain regions of both groups of alcoholics ofcf controls, but the reverse was true for [3H]flunitrazepam, especially in cirrhotic cases. [3H]Diazepam affinity was invariant across all males and the female control, but lower in the female cirrhotic alcoholics. Affinity for [3H]flunitrazepam tended to be the reverse of that for [3H]diazepam. [3H]Diazepam Bmax was markedly lower in female cirrhotic alcoholics, especially in superior frontal gyrus, whereas this region showed a much higher Bmax in the female control case. A small regional difference in [3H]flunitrazepam Bmax was the reverse of that for [3H]diazepam Bmax and was seen in all groups. GABA-mediated neurotransmission may be selectively altered in a pathologically abnormal region of cerebral cortex in cirrhotic alcoholics, and the sexes may show differing susceptibilities to change.  相似文献   
68.
  • ? A pilot study of catheterized women was designed to investigate their perceptions of pain and discomfort during the procedure.
  • ? The study aimed to test the feasibility of conducting a larger randomized controlled trial.
  • ? Problems were encountered during the execution of the study, due to the need to conform to established principles in clinical research.
  • ? Restrictions on access to patients impinged upon the opportunity to ‘cast the net wide’ in order to generate meaningful data.
  相似文献   
69.
70.
Sleep, age, and shiftwork experience   总被引:4,自引:0,他引:4  
The effects of age and shiftwork experience (never, past, present) on sleep were studied in a sample of 3236 wage earners and retired workers by means of a questionnaire. The sample was composed of 32-, 42-, 52-, and 62-year-old subjects, and included both sexes and various occupational statuses. Age resulted in a continuously increasing frequency of sleep disturbances and hypnotic use, except for difficulty getting back to sleep and early awakening, which peaked at 52 years and then decreased at 62 years, thus suggesting a 'retirement effect'. Current and past shiftworkers reported more problems with falling asleep and early awakening than subjects who had never worked on shifts. This is a likely explanation of why the effect of age was massive in the latter group and much less pronounced in the former groups. There were no clear effects of the length or recency of shiftwork experience. This finding does not support the hypothesized permanent effect of shiftwork experience on subsequent sleep. Females had higher complaint rates at every age. There was little interaction between age and sex, but women were affected more by shiftwork as they got older, particularly as to hypnotic consumption. Some of the results support the hypothesis that a selection process excludes workers who are no longer able to cope with the demands of shiftwork.  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