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   9359篇
  免费   2513篇
  国内免费   131篇
耳鼻咽喉   370篇
儿科学   203篇
妇产科学   255篇
基础医学   288篇
口腔科学   159篇
临床医学   2916篇
内科学   1740篇
皮肤病学   322篇
神经病学   717篇
特种医学   327篇
外科学   1327篇
综合类   365篇
现状与发展   2篇
预防医学   1750篇
眼科学   110篇
药学   233篇
  1篇
中国医学   100篇
肿瘤学   818篇
  2024年   80篇
  2023年   411篇
  2022年   117篇
  2021年   266篇
  2020年   492篇
  2019年   169篇
  2018年   572篇
  2017年   605篇
  2016年   623篇
  2015年   714篇
  2014年   717篇
  2013年   1050篇
  2012年   410篇
  2011年   353篇
  2010年   524篇
  2009年   635篇
  2008年   326篇
  2007年   249篇
  2006年   283篇
  2005年   207篇
  2004年   153篇
  2003年   118篇
  2002年   110篇
  2001年   190篇
  2000年   119篇
  1999年   161篇
  1998年   275篇
  1997年   288篇
  1996年   309篇
  1995年   251篇
  1994年   174篇
  1993年   119篇
  1992年   90篇
  1991年   90篇
  1990年   79篇
  1989年   97篇
  1988年   83篇
  1987年   58篇
  1986年   55篇
  1985年   63篇
  1984年   50篇
  1983年   48篇
  1982年   38篇
  1981年   48篇
  1980年   24篇
  1978年   14篇
  1977年   17篇
  1976年   13篇
  1975年   14篇
  1972年   10篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
41.
Despite being constantly cited as a critical intervening variable in the recovery from alcohol problems, there is a paucity of literature on client motivation. This paper reviews the current literature which impacts on motivation and its importance in treatment and develops in a stepwise manner the revised expectancy/motivation hypothesis, tentatively explaining both motivation and denial as a natural process in behavioural change. Because of the revised expectancy/motivation hypothesis' distinctly defined stages which closely relate to the process of nursing and the qualitative and quantitative measurement it entails which the nursing process demands, it offers a particularly appropriate model for treatment within nurse practice.  相似文献   
42.
43.
In situ saphenous vein grafts are being used with increasing frequency for bypass procedures involving the femoral and popliteal arteries. Complications of these procedures include anastomotic stenoses and persistent arteriovenous fistulae that may result in failure of the graft. Balloon angioplasty and embolotherapy with detachable balloons were employed successfully in three or four recent cases of patients with complications from in situ grafts. Tailored angiography is essential for evaluating in situ grafts, and interventional techniques are extremely useful for managing complications.  相似文献   
44.
Approximately 11,550 women with epilepsy give birth annually, yet maternity nurses receive little information on how to care for these patients. Children of epileptic mothers are born with an increased incidence of birth defects, and have a higher perinatal mortality rate. Complications such as bleeding during pregnancy, and interventions such as cesarean births and labor inductions are more common among epileptic women, and seizures tend to increase during pregnancy in more than one-third of epileptic women. Informed nursing care is essential to ensure the best possible outcome of these pregnancies.  相似文献   
45.
46.
We observed histopathological and ultrastructural hepatic changes following the intracardiac inoculation ofLeishmania donovani amastigotes into inbred LHC hamsters (group I). Since granuloma formation is known to be T-cell-dependent, we also examined infected hamsters under cyclophosphamide immunosuppressive treatment (group ICy) and evaluated the production of interleukin-2 (IL-2) by their cells. Group I showed more intense hepatocyte and endothelial cell clasmatosis as well as hepatocyte degeneration and necrosis, deposits of connective tissue fibers, granulomas with multinucleated giant cells (MGCs) of foreign-body and Langhans' types and reduced production of IL-2 by spleen cells. In contrast, group ICy hamsters exhibited larger eosinophil and lymphocyte populations within sinusoids and peri-sinusoidal areas but showed no MGCs in granulomas. A striking decline in IL-2 production was noted. These results suggest that cyclophosphamide induces a delay in the natural evolution ofL. donovani-induced granulomatous hepatic inflammation.  相似文献   
47.
48.
This study compared recovery characteristics and postoperative ventilatory function when halothane, fentanyl or combination of halothane and fentanyl in addition to N2O were used for intraoperative anaesthesia in term infants undergoing hernia repair as outpatients. Sixty-six full term ASA PS I infants ages 1–12 months were studied. All received inhalation induction with N2O, O2 and halothane, followed by intravenous atropine and atracurium, tracheal intubation, and controlled ventilation. For anaesthesia maintenance, patients were randomized into one of three groups. Group I received 70% N2O, 30% O2 and halothane. Group II received 70% N2O, 30% O2, halothane and 2 μg·kg?1 fentanyl. Group III received 70% N2O, 30% O2 and 10 μg·kg?1 fentanyl. Awakening times were similar in all three groups, however, Group I patients had significantly shorter recovery and discharge times than those of Group II and III. None of the patients experienced postoperative apnoea or periodic breathing. One patient in Group III experienced two brief episodes of bradycardia not associated with apnoea or arterial desaturation (Spo 2 >90% for greater than 30 s). Decreased Spo 2 occurred less frequently in Group I (5.9%) compared to Group II (22.7%) and Group III (19.0%) patients, however, the group differences were not significant. Transcutaneous CO2 (TcCO2) values were not statistically different among the three groups. Pain scores were initially lower in Groups II and III, but at 120 min the differences were not significant. Postoperative apnoea was not observed in this study. Spo 2 <90% and TcCO2 >9 kPa (70 mmHg) was more common in infants receiving 2 and 10 μg·kg?1 fentanyl than in infants receiving halothane and nitrous oxide anaesthesia. Infants <3 months old did not have a higher incidence of Spo 2 <90% or significantly higher TcCO2 values when compared to infants >3 months old. Fentanyl in doses used in this study did not prolong awakening time but did prolong recovery and discharge times in outpatient infants.  相似文献   
49.
50.
There is an ongoing debate in nurse education concerning the role and delivery of the biological sciences in the nursing curriculum. One of the fundamental questions raised by this debate asks how best can teachers impart biological knowledge in a manner that can be readily applied by students and qualified nurses to inform their clinical practice. This paper will include a discussion of some of the features of pre-registration education that may have influenced the manner in which biological sciences are perceived, taught and used by nurses. It will be argued that nursing may have developed a form of incomplete holism and that this may be in part responsible for the challenges that remain to be met within this area of the nursing curriculum. As a response to incomplete holism an innovative approach within pre-registration education will be introduced. This development involves the use of linked teaching sessions which aim to develop the analytical skills necessary to apply physiological knowledge to nursing practice.  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