全文获取类型
收费全文 | 3373260篇 |
免费 | 268292篇 |
国内免费 | 6045篇 |
专业分类
耳鼻咽喉 | 48532篇 |
儿科学 | 107563篇 |
妇产科学 | 93037篇 |
基础医学 | 475057篇 |
口腔科学 | 99431篇 |
临床医学 | 306648篇 |
内科学 | 653121篇 |
皮肤病学 | 70344篇 |
神经病学 | 280755篇 |
特种医学 | 134312篇 |
外国民族医学 | 1247篇 |
外科学 | 507041篇 |
综合类 | 82935篇 |
现状与发展 | 4篇 |
一般理论 | 1427篇 |
预防医学 | 272192篇 |
眼科学 | 79795篇 |
药学 | 252312篇 |
7篇 | |
中国医学 | 6250篇 |
肿瘤学 | 175587篇 |
出版年
2018年 | 33606篇 |
2016年 | 28900篇 |
2015年 | 33035篇 |
2014年 | 46912篇 |
2013年 | 71746篇 |
2012年 | 96443篇 |
2011年 | 102006篇 |
2010年 | 60270篇 |
2009年 | 57532篇 |
2008年 | 97130篇 |
2007年 | 102879篇 |
2006年 | 104035篇 |
2005年 | 101172篇 |
2004年 | 98199篇 |
2003年 | 94521篇 |
2002年 | 93314篇 |
2001年 | 153519篇 |
2000年 | 158986篇 |
1999年 | 134984篇 |
1998年 | 39146篇 |
1997年 | 35493篇 |
1996年 | 34992篇 |
1995年 | 33935篇 |
1994年 | 31922篇 |
1993年 | 29858篇 |
1992年 | 109689篇 |
1991年 | 106065篇 |
1990年 | 102955篇 |
1989年 | 99466篇 |
1988年 | 92457篇 |
1987年 | 91215篇 |
1986年 | 86627篇 |
1985年 | 83055篇 |
1984年 | 63004篇 |
1983年 | 54074篇 |
1982年 | 32661篇 |
1981年 | 29179篇 |
1980年 | 27489篇 |
1979年 | 59839篇 |
1978年 | 42095篇 |
1977年 | 35521篇 |
1976年 | 33313篇 |
1975年 | 35267篇 |
1974年 | 43490篇 |
1973年 | 41541篇 |
1972年 | 38706篇 |
1971年 | 36031篇 |
1970年 | 33645篇 |
1969年 | 31420篇 |
1968年 | 28657篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
71.
72.
AIM: The intention was to investigate cerebrospinal fluid pressure (CSFP) and volume of cerebrospinal fluid (CSF) drained during and after thoracic- and thoracoabdominal aneurysm repair. The findings were related to the occurrence of postoperative neurologic deficits. METHODS: Twenty-nine patients (12 with thoracic and 17 with thoracoabdominal aortic aneurysm) were operated without shunting or extracorporeal circulation. For monitoring of CSFP an intrathecal catheter was placed in all patients. The volume of CSF withdrawn intraoperatively, on the day of operation as well as on the 1st and 2nd postoperative day was recorded. RESULTS: Twenty-six patients had no postoperative neurologic sequelae. One patient had postoperative paraplegia while 2 had paraparesis. The three patients with neurologic sequelae had higher CSFP intraoperatively than those without neurologic symptoms (P=0.04). Median CSFP during aortic cross-clamping was 19 mmHg and 10 mmHg and the median volumes of CSF drained on the day of operation 210 and 85 mL in the two groups, respectively. There was a significant positive correlation between CSFP and central venous pressure. CONCLUSIONS: A higher intraoperative CSFP was observed in patients with neurologic sequelae following thoracic- and thoracoabdominal aneurysm repair. Further, there was a tendency of higher volumes of CSF drained in this group of patients. Although, the series is too small to allow firm conclusions, it supports the view that CSFP monitoring and drainage is beneficial during thoracic- and thoracoabdominal aneurysm repair. 相似文献
73.
Many recent efforts in the field of community psychology have been dedicated to moving from values to action in incorporating diversity into our work. An essential aspect of this goal is designing research that provides opportunities for underrepresented perspectives to be heard. The voices of refugee women, in particular, are not typically incorporated in research, planning for service provision, and policy design. This article explores methodological challenges involved in conducting research with refugee women who are marginalized both within broader U.S. contexts and within their own communities. Six guiding principles are presented: 1) develop strategies for involving marginalized refugee women; 2) consider the advantages and limitations of quantitative and qualitative methodologies and be innovative about combining them; 3) prepare for extensive time and effort for quantitative measure construction; 4) consider gendered decision‐making structures in the lives of refugee women and their potential impact on the research process; 5) plan for refugee women's common triple burden of working outside of the home, managing their households, and adjusting to life in a new country; and 6) attend to refugee women's cultural norms about and unfamiliarity with the interview process. © 2004 Wiley Periodicals, Inc. J Comm Psychol 32: 721–739, 2004. 相似文献
74.
75.
76.
77.
78.
79.
Harvey A. Siegal PhD ; Paul J. Draus PhD ; Robert G. Carlson PhD ; Russel S. Falck MA ; Jichuan Wang PhD 《The Journal of rural health》2006,22(2):169-173
CONTEXT: Although the nonmedical use of stimulant drugs such as cocaine and methamphetamine is increasingly common in many rural areas of the United States, little is known about the health beliefs of people who use these drugs. PURPOSE: This research describes illicit stimulant drug users' views on health and health-related concepts that may affect their utilization of health care services. METHODS: A respondent-driven sampling plan was used to recruit 249 not-in-treatment, nonmedical stimulant drug users who were residing in 3 rural counties in west central Ohio. A structured questionnaire administered by trained interviewers was used to collect information on a range of topics, including current drug use, self-reported health status, perceived need for substance abuse treatment, and beliefs about health and health services. FINDINGS: Participants reported using a wide variety of drugs nonmedically, some by injection. Alcohol and marijuana were the most commonly used drugs in the 30 days prior to the interview. Powder cocaine was used by 72.3% of the sample, crack by 68.3%, and methamphetamine by 29.7%. Fair or poor health status was reported by 41.3% of the participants. Only 20.9% of the sample felt they needed drug abuse treatment. Less than one third of the sample reported that they would feel comfortable talking to a physician about their drug use, and 65.1% said they preferred taking care of their problems without getting professional help. CONCLUSIONS: Stimulant drug users in rural Ohio are involved with a range of substances and hold health beliefs that may impede health services utilization. 相似文献
80.
S Balzer D T Schneider M B Bernbeck M J?ger O Mils J Schaper R Willers R Krauspe U G?bel R Wessalowski 《International journal of hyperthermia》2006,22(6):451-461
PURPOSE: In children with locally advanced or recurrent malignant tumours, prognosis can be improved by regional deep hyperthermia (RHT) in combination with platin-based chemotherapy. However, because of the increasing number of patients that achieve long-time remission with this therapy, it is necessary to evaluate long-term sequelae of thermochemotherapy. During the years 1993-2004 one has observed avascular osteonecrosis (AON) of the femoral head after RHT in seven children with pelvic germ cell tumours or rhabdomyosarcomas. METHODS: Although AON may develop in patients with malignancies treated with chemo- or radiotherapy alone, RHT might nevertheless contribute to the occurrence of AON. In order to determine potential risk factors for AON after RHT, this study analysed the relationship of AON to the patient's age, medical history and treatment parameters such as thermal dose equivalent and power output. RESULTS AND CONCLUSIONS: In the present study AON was associated with young age as well as intensity of hyperthermia indicated by high power levels that exceed 20 W per kg body weight and/or application of eight or more heat sessions as well as additional radiotherapy. Based on this observation, it was assumed that an optimized three dimensional thermal field modelling may be helpful to avoid hazardous temperatures in the femoral heads during RHT treatment and to reduce AON of the femoral heads. 相似文献