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   17902篇
  免费   1833篇
  国内免费   127篇
耳鼻咽喉   455篇
儿科学   461篇
妇产科学   375篇
基础医学   1381篇
口腔科学   294篇
临床医学   3735篇
内科学   3132篇
皮肤病学   370篇
神经病学   1338篇
特种医学   615篇
外科学   2284篇
综合类   545篇
现状与发展   2篇
一般理论   4篇
预防医学   2503篇
眼科学   221篇
药学   664篇
  1篇
中国医学   124篇
肿瘤学   1358篇
  2024年   130篇
  2023年   505篇
  2022年   177篇
  2021年   400篇
  2020年   581篇
  2019年   280篇
  2018年   722篇
  2017年   681篇
  2016年   757篇
  2015年   837篇
  2014年   864篇
  2013年   1285篇
  2012年   720篇
  2011年   706篇
  2010年   703篇
  2009年   811篇
  2008年   565篇
  2007年   586篇
  2006年   627篇
  2005年   475篇
  2004年   423篇
  2003年   364篇
  2002年   358篇
  2001年   429篇
  2000年   364篇
  1999年   320篇
  1998年   351篇
  1997年   344篇
  1996年   375篇
  1995年   299篇
  1994年   236篇
  1993年   186篇
  1992年   233篇
  1991年   234篇
  1990年   218篇
  1989年   247篇
  1988年   217篇
  1987年   247篇
  1986年   189篇
  1985年   192篇
  1984年   166篇
  1983年   145篇
  1982年   82篇
  1981年   101篇
  1980年   76篇
  1979年   84篇
  1978年   83篇
  1976年   75篇
  1974年   76篇
  1973年   83篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
Aim. To explore barriers to, and incentives for, clients on methadone-maintenance treatment (MMT) in Auckland, New Zealand to transfer from secondary care to general practitioner (GP) care. Design. Surveys (with free text response sections) of MMT secondary care staff, stabilised clinic clients, authorised GPs and GP patients. Results. High response rates from secondary care staff (77%) and GPs (74%). Barriers to stable clients' transfer included financial cost and attitudes of secondary care staff and clients. Incentives for patient transfer included confidentiality, a holistic approach to their care, continuity of care, increased patient control, convenience and avoidance of contact with other opioid-dependent people. Distrust in the quality of care provided by authorised GPs was a major barrier for some secondary care staff and their clients, despite prerequisite training for authorisation. In contrast, patients rated primary better than secondary care with none stating a likelihood to return to the secondary service within 6 months. Conclusions. Progression from secondary to primary care should be incorporated in MMT planning from the outset, with secondary services staff reassured about the quality of primary care. An integrated transition period and exploration of funding options to assist transfer from largely publicly funded secondary to largely privately funded primary care are also recommended. [Sheridan J, Goodyear-Smith F, Butler R, Wheeler A, Gohns A. Barriers to, and incentives for, the transfer of opioid-dependent people on methadone maintenance treatment from secondary care to primary health care. Drug Alcohol Rev 2008;27:178-184]  相似文献   
992.
ABSTRACT

Acute severe pesticide-related illness among farm worker children is rarely reported. The authors report a toddler with acute onset of apnea, cyanosis, somnolence, hypotonia, tachycardia, and miosis who required hospitalization. Health care providers suspected pesticide poisoning, but were unable to determine the causal agent. Investigation by a public health program documented four pesticide exposures that occurred within one-half hour of acute illness. This case illustrates the importance of a thorough environmental/occupational exposure history and obtaining biological samples. It also documents the need to strengthen the Worker Protection Standard for agricultural workers and the importance of reporting and investigating pesticide-related illness.  相似文献   
993.
This work presents a comparison of air kerma rate (AKR) measurements performed by multiple radiotherapy centres for a single HDR 192Ir source. Two separate groups (consisting of 15 centres) performed AKR measurements at one of two host centres in Australia. Each group travelled to one of the host centres and measured the AKR of a single 192Ir source using their own equipment and local protocols. Results were compared to the 192Ir source calibration certificate provided by the manufacturer by means of a ratio of measured to certified AKR. The comparisons showed remarkably consistent results with the maximum deviation in measurement from the decay-corrected source certificate value being 1.1%. The maximum percentage difference between any two measurements was less than 2%. The comparisons demonstrated the consistency of well-chambers used for 192Ir AKR measurements in Australia, despite the lack of a local calibration service, and served as a valuable focal point for the exchange of ideas and dosimetry methods.  相似文献   
994.
Although much research has focused on the psychological, social, and economic consequences of heavy problem drinking, there has been far less attention paid to the consequences of "moderate" drinking. This study used a unique opportunity to carry out a six year follow up of a cohort of male and female white collar workers in whom there was baseline information on alcohol consumption and access to details on sickness absence, labour turnover, and promotion. It has provided evidence that even moderate alcohol consumption in the working population is associated with social costs for the employer and the employee, including substantial sickness absence, and lack of promotion in men, although the increase in labour turnover was not statistically significant. The longitudinal examination of consumption in this study suggests that early intervention in a drinking career may reduce alcohol consumption and consequently avoid years of morbidity and sickness absence, as well as having a favourable influence on performance and labour turnover.  相似文献   
995.
As a result of studies in Texas that indicated menus in child care centers may be depriving children of nutrients, a study was conducted to determine the prevalence of similar problems in 7 states. Menus for breakfast or morning snack, lunch, and afternoon snack for 10 consecutive program days were obtained from 171 child care centers. Results of nutrient analysis of the menus were compared against the Recommended Dietary Allowances (RDA) for children aged 1 to 3 and 4 to 6. Menus typically provided at least 100 percent of the RDA for protein and the vitamins A, ascorbic acid, B12, and riboflavin. The menus offered an average of only 42 percent of the iron needed by both the younger and older children. In all 7 states the menus provided less than 56 percent of the kilocalories recommended and less than 64 percent of niacin for the 1 to 3 year olds. Mean value for kilocalories for the 3–5 year old averaged 40 percent of recommendation while niacin averaged 48 percent. These findings indicate that attention should be directed toward careful assessment of nutritional adequacy of meals and snacks actually served at child care centers, the children's nutritional intake at the center, and the nutritional content of meals and snacks eaten away from the center.Margaret E. Briley is Associate Professor of Graduate Nutrition at The University of Texas at Austin, Cynthia Roberts-Gray is Senior Scientist and Owner of The Resource Network in Austin, Texas, and Susanne Rowe is Research Associate in the Division of Graduate Nutrition at The University of Texas at Austin.This project was supported in part by a grant from the Texas Nutrition Education and Training Program, Texas Department of Human Services, Deborah Simpson, Coordinator. We appreciate the assistance of NET Program Coordinators and CACFP Coordinators in the seven states that participated in this study.  相似文献   
996.

Background  

Significant numbers of people are exposed to tetrachloroethylene (perchloroethylene, PCE) every year, including workers in the dry cleaning industry. Adverse health effects have been associated with PCE exposure. However, investigations of possible cumulative cytogenetic damage resulting from PCE exposure are lacking.  相似文献   
997.
目的总结甲型H1N1流感流行期间发热门诊的医院感染措施经验。方法调配人力资源,强化培训,使消毒隔离和个人防护措施落实到位。结果预检筛查发热患者2453例,确诊的甲型H1N1流感患者140例,占5.7%;与患者密切接触者和医务人员未发生感染,及时有效地阻止了疫情的扩散和蔓延。结论发热门诊的布局、管理体系和完善的工作流程,在应对突发公共卫生事件的救治中有重要意义。  相似文献   
998.
The effects of teacher-directed cognitive self-instruction (TI) were compared with an instructions-only component control condition (IO) in order to examine the former's efficacy as a primary prevention strategy. In a quasi-experimental design. two intact high school psychology classes were randomly assigned to either TI or IO. Each condition lasted for eight 45-minute class periods, and each group was given an in vivo homework assignment. Pretreatment equivalence and demand analyses yielded no evidence of differences. Results of a posttreatment measure of attitude toward treatments and a pre- and posttreatment measure of state anxiety suggested that trainerdirected cognitive self-instruction may be a promising primary prevention strategy.Stanley B. Baker is Associate Professor of Education at the Division of Counseling and Educational Psychology, Pennsylvania State University. James N. Butler is Psychology Teacher, Tyrone Area High School, Tyrone, PA.  相似文献   
999.
Whereas, most cancer research data come from high-profile academic centers, little is known about the outcomes of cancer care in rural communities. We summarize the experience of building a multi-institution partnership to develop a cancer outcomes research infrastructure in Southwest Georgia (SWGA), a primarily rural 33-county area with over 700,000 residents. The partnership includes eight institutions: the Emory University in Atlanta, the Centers for Disease Control and Prevention (CDC), the Georgia Comprehensive Center Registry (the Registry), the Southwest Georgia Cancer Coalition (the Coalition), and the four community cancer centers located within the SWGA region. The practical application of the partnership model, its organizational structure, and lessons learned are presented using two specific examples: a study evaluating treatment decisions and quality of life among prostate cancer patients, and a study of treatment discontinuation among prostate, breast, lung, and colorectal cancer patients. Our partnership model allowed us to (1) use the Coalition as a link between Atlanta-based researchers and local community; (2) collaborate with the area cancer centers on day-to-day study activities; (3) involve the Registry personnel and resources to identify eligible cancer cases and to perform data collection; and (4) raise community awareness and sense of study ownership through media announcements organized by the Coalition. All of the above activities were performed in consultation with the funding institution (CDC) and its project directors who oversee several other studies addressing similar research questions throughout the country. Our partnership model may provide a useful framework for cancer outcomes research projects in rural communities.  相似文献   
1000.
Objective  To investigate health researchers' attitudes to involving the public in research.
Background  Public involvement in research is encouraged by the Department of Health in the UK. Despite this, the number of health researchers actively involving the public in research appears to be limited. There is little research specifically addressing the attitudes of health researchers towards involving the public: how they interpret the policy, what motivates and de-motivates them and what their experiences have been to date.
Design  A qualitative research design, using semi-structured telephone interviews.
Setting and participants  Fifteen purposively sampled UK-based University health researchers were the participants. Interviews were conducted over the telephone.
Findings  The participants suggested varying constructions of public involvement in research. Arguments based on moral and political principles and consequentialist arguments for involving the public in research were offered and most participants highlighted the potential benefits of involving the public. However, feelings of apprehension expressed by some participants imply that a number of researchers may still be uncomfortable with involving the public, as it presents a different way of working.  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