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   12556篇
  免费   871篇
  国内免费   23篇
耳鼻咽喉   94篇
儿科学   404篇
妇产科学   365篇
基础医学   1542篇
口腔科学   138篇
临床医学   2216篇
内科学   1973篇
皮肤病学   164篇
神经病学   1213篇
特种医学   274篇
外科学   1225篇
综合类   222篇
一般理论   24篇
预防医学   1505篇
眼科学   284篇
药学   820篇
  2篇
中国医学   7篇
肿瘤学   978篇
  2023年   60篇
  2022年   129篇
  2021年   218篇
  2020年   143篇
  2019年   227篇
  2018年   259篇
  2017年   208篇
  2016年   203篇
  2015年   233篇
  2014年   317篇
  2013年   579篇
  2012年   777篇
  2011年   887篇
  2010年   470篇
  2009年   454篇
  2008年   804篇
  2007年   813篇
  2006年   880篇
  2005年   857篇
  2004年   908篇
  2003年   850篇
  2002年   756篇
  2001年   166篇
  2000年   108篇
  1999年   138篇
  1998年   157篇
  1997年   131篇
  1996年   98篇
  1995年   103篇
  1994年   77篇
  1993年   79篇
  1992年   100篇
  1991年   69篇
  1990年   77篇
  1989年   66篇
  1988年   59篇
  1987年   63篇
  1986年   78篇
  1985年   62篇
  1984年   65篇
  1983年   67篇
  1982年   54篇
  1981年   67篇
  1980年   74篇
  1979年   42篇
  1978年   45篇
  1977年   38篇
  1976年   32篇
  1975年   33篇
  1973年   35篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
101.
Guidelines provided by the Director of Public Prosecutions suggest that anyone assisting another to commit suicide in England and Wales, or elsewhere, will not be prosecuted provided there are no self-seeking motives and no active encouragement. This reflects the position in Switzerland. There, however, no difference is made between assistance and inducement. In addition, the Swiss approach makes it possible to establish organisations to assist the suicides of both their citizens and foreign visitors. It should not be assumed that this approach is without controversy in Switzerland. Proposals for reform continue to be debated there, not least because of the concern about some of the actual practices of certain end-of-life organisations. It is likely that a few English citizens will continue to avail themselves of these services in Switzerland if they cannot find the help they require here. This paper explores the legitimacy of the current restrictive position adopted towards assisted suicide in England. It argues that the provisions within the guidelines prohibiting organisations that assist suicides, leaves some without the help they need. While legislative decriminalisation of assisted suicide and the establishment of state-sponsored suicide centres would represent the most permissive regime, this paper proposes that this would be a step too far. The preference here is for decriminalisation but adopting a ‘middle way’ between the two extremes: the more permissive approach provided by the ‘Swiss model’ is one that could be employed here, albeit within a more robust regulatory regime.  相似文献   
102.
The determinants that underlie a healthy or unhealthy pregnancy are complex and not well understood. We assess the relationship between the built environment and maternal psychosocial status using directly observed residential neighborhood characteristics (housing damage, property disorder, tenure status, vacancy, security measures, violent crime, and nuisances) and a wide range of psychosocial attributes (interpersonal support evaluation list, self-efficacy, John Henryism active coping, negative partner support, Perceived Stress Scale, perceived racism, Center for Epidemiologic Studies—Depression) on a pregnant cohort of women living in the urban core of Durham, NC, USA. We found some associations between built environment characteristic and psychosocial health varied by exposure categorization approach, while others (residence in environments with more rental property is associated with higher reported active coping and negative partner support) were consistent across exposure categorizations. This study outlines specific neighborhood characteristics that are modifiable risk markers and therefore important targets for increased research and public health intervention.  相似文献   
103.
104.
The present study was undertaken to replicate an earlier experiment and to clarify which factors in this previous experiment (Nash, Johnson, & Tipton, 1979) were responsible for the obtained child-like behaviors of hypnotically regressed Ss. As in the previous study, 3 characteristics of the transitional object relationship (spontaneity, specificity, and intensity) were used as the primary criteria to investigate the effects of hypnotic age regression when Ss were regressed to age 3 and placed in 3 home situations. While in the previous study E suggested separation anxiety and isolation during the 3 home situations (mother-absent condition), the present study deleted all references to anxiety and isolation, and replaced them with suggestions of security and maternal proximity (mother-present condition). As expected, the mother-present versus mother-absent conditions led to similar hypnotized-simulating differences. In further accord with predictions, hypnotized Ss and simulating Ss requested a transitional object infrequently in the presence of mother. The importance of using dependent measures which index affective processes germane to interpersonal affect-laden experience is discussed.  相似文献   
105.
Introduction. Pain and its control have been studied extensively in the emergency department. Numerous studies indicate that inadequate treatment of pain is common, despite the availability of myriad analgesics. It has been suggested that oligoanesthesia is also a common practice in the prehospital setting. Objective. To assess the use of prehospital analgesia in patients with suspected extremity fracture. Methods. Emergency medical services (EMS) call reports were reviewed for all patients with suspected extremity fractures treated from June 1997 to July 1998 in a midwestern community with a population base of 223,000. Data collected included demographic information, mechanism of injury, medications given, and field treatment. Standing orders for administration of analgesia were available and permitted paramedics to give either morphine sulfate or nitrous oxide per protocol. Results. The EMS call reports were analyzed for 1,073 patients with suspected extremity fractures. The mean patient age was 47 years. Accidental injuries comprised 86.5% of those reviewed. Suspected leg fractures were most common (20%), followed by hips (18%), arms (11%), knees (10%), ankles (9%), shoulders (7.2%), hands (5.5%), and wrists (5.3%). Multiple trauma and assorted broken digits accounted for the remaining 14%. The most common mechanisms of injury were: fall (43%), motor vehicle collision (21%), and human assault (10%). Intravenous lines were placed in 9.4% of patients; 17% received ice packs; 16% received bandage/dressings; 25% received air splints; and 19% were fully immobilized. Analgesia was administered to 18 patients (1.8%): 16 patients received nitrous oxide and two received morphine. Conclusion. Administration of analgesics to prehospital patients with suspected fractures was rare. Prehospital identification and treatment of pain for patients with musculoskeletal trauma could be improved.  相似文献   
106.
Objective. To evaluate the effect of a system of financial reward for emergency medical technicians (EMTs) who meet selected quality marker goals. Methods. This project was reviewed by an institutional review board (IRB) andwas found to be exempt from IRB review. Two operational andfour clinical markers were targeted for improvement. Baseline performance measurements were retrospectively measured for the preceding year, andchallenging but achievable goals for improvement were established. Operational markers included completing run reports within three hours after completion of the run andcall-to-en route (“out-of-chute”) times of less than 90 seconds for emergency calls on our first-line ambulance. Clinical markers included the use of aspirin in adults with nontraumatic chest pain, electrocardiogram (ECG) performance in adults with nontraumatic chest pain, documentation of pain assessment andintervention in patients with traumatic hip pain, anddocumentation of the time of onset of symptoms in stroke calls. Each full-time EMT could earn up to $1,000 in addition to baseline pay, with part-time EMTs eligible for prorated amounts. Results. Postincentive run reports were completed within three hours 99.7% of the time, with 21 of 24 providers meeting the goal 100% of the time. Before the incentive, reports were completed within three hours 64% of the time, with only two of 23 providers meeting the goal 100% of the time. The out-of-chute goal of less than 90 seconds was met 98.7% of the time, compared with 90.1% before the incentive. Aspirin use in adult nontraumatic chest pain improved from 68% to 96.3%, andECG performance in this group improved from 43% to 87.8%. Documentation of the time of onset of symptoms in stroke patients improved from 97% to 100%, andthe assessment of andintervention for pain in traumatic hip pain patients improved from 56% to 100%. Conclusion. Financial motivation improved targeted quality measures in this rural emergency medical service. It appears to be a useful adjuvant to traditional quality improvement mechanisms.  相似文献   
107.
Team Reach Out Biloxi is a nursing student-initiated service-learning project with the goal of providing ongoing assistance to the victims of Hurricane Katrina. On 6 different occasions from 2005 to 2008, Purdue nursing students integrated their leadership skills with application of public health knowledge, compassion, and concern as they worked in partnership with the Gulfport region Coastal Family Health Clinics (CFHC). This article reviews the service-learning framework, course planning, and implementation of a 3-year posthurricane disaster project.  相似文献   
108.
The purpose of this study was to compare the performance of four power wheelchairs when used by children to perform a variety of indoor activities. Eight boys and eight girls performed a series of 11 functional tasks when positioned in each of four different power wheelchairs reflecting different design classes. There were no significant differences for many of the dependent variables. However, the Everaid Turbo was significantly better for functional positioning at a standard kitchen table and at school desks and for accessing objects at different heights. By contrast the Invacare Jaguar was better for straight-line driving speed. Other findings include children's subjective impressions of the four power wheelchairs.  相似文献   
109.
Most cell phone owners use the short message service (SMS), also known as “texting.” Most teens and young adults use text messages; they were the first users to embrace this technology and are still the most frequent users. Text messaging has the potential to provide them with information about preventing sexually transmitted infections. Several innovative programs that use text messaging to promote sexual health are described here.  相似文献   
110.
Tubulointerstitial nephritis (TIN) is a disease pattern with heterogeneous causes. Recently a specific subtype of autoimmune TIN, IgG4-related TIN, has been identified that is part of systemic IgG4-related disease/ autoimmune pancreatitis. On biopsy, this TIN shows an IgG4+ plasma cell-rich infiltrate, akin to the pancreatic tissue findings in autoimmune pancreatitis, and may show tubulointerstitial immune complex deposits. Notably, some cases may be mass-forming. Recognition of this specific type of TIN can guide appropriate patient therapy.  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