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   68241篇
  免费   4975篇
  国内免费   1129篇
耳鼻咽喉   687篇
儿科学   1455篇
妇产科学   1274篇
基础医学   10488篇
口腔科学   974篇
临床医学   8418篇
内科学   11581篇
皮肤病学   1501篇
神经病学   6296篇
特种医学   2404篇
外国民族医学   5篇
外科学   6974篇
综合类   2775篇
现状与发展   8篇
一般理论   42篇
预防医学   5563篇
眼科学   1459篇
药学   5736篇
  15篇
中国医学   1106篇
肿瘤学   5584篇
  2024年   92篇
  2023年   688篇
  2022年   1515篇
  2021年   2394篇
  2020年   1452篇
  2019年   1865篇
  2018年   2162篇
  2017年   1706篇
  2016年   2028篇
  2015年   2488篇
  2014年   3201篇
  2013年   3764篇
  2012年   5631篇
  2011年   5809篇
  2010年   3276篇
  2009年   2844篇
  2008年   4421篇
  2007年   4377篇
  2006年   3930篇
  2005年   3932篇
  2004年   3335篇
  2003年   3010篇
  2002年   2708篇
  2001年   946篇
  2000年   869篇
  1999年   869篇
  1998年   655篇
  1997年   543篇
  1996年   404篇
  1995年   399篇
  1994年   327篇
  1993年   281篇
  1992年   281篇
  1991年   278篇
  1990年   228篇
  1989年   202篇
  1988年   166篇
  1987年   147篇
  1986年   131篇
  1985年   98篇
  1984年   105篇
  1983年   89篇
  1982年   89篇
  1981年   87篇
  1980年   87篇
  1979年   62篇
  1978年   48篇
  1977年   53篇
  1976年   42篇
  1974年   41篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
51.
BACKGROUND: To adequately address the complex health needs of young people, their access to services, and the quality of services received, must be improved. AIMS: To explore the barriers to service provision for young people and to identify the training needs of primary healthcare service providers in New South Wales (NSW), Australia. DESIGN OF STUDY: A cross-sectional, qualitative study of the perspectives of a range of health service providers. SETTING: A range of primary healthcare organisations across NSW. METHODS: Samples of general practitioners (GPs), youth health workers, youth health coordinators, and community health centre staff were drawn from urban and rural clusters across NSW. Focus groups and interviews were used to identify barriers to service provision and the training needs of service providers. Data were tape recorded, transcribed, and analysed. RESULTS: Barriers to service provision among GPs and community health centre staff included inadequate time, flexibility, skills, and confidence in working with young people, and poor linkages with other relevant services. Training needs included better knowledge of and skills in adolescent health requirements, working with adolescents, and working with other services. Barriers to service provision for youth health workers and coordinators included lack of financial resources and infrastructure. There were few linkages between groups of service providers. CONCLUSION: Models of service provision that allow stronger linkages between service providers, sufficient time for consultation with young people, adequate training and support of health professionals, and flexibility of service provision, including outreach, should be explored and evaluated.  相似文献   
52.
Our aim was to develop and validate a new method to assess objectively and quantitatively the morphology of the nostrils after nasal or nasolabial surgery. We used digital analysis using specific mathematical algorithms to assess several geometric measurements, particularly of facial asymmetry, expressed in adimensional units. Forty-five patients with no facial anomalies (control group) were used initially to evaluate the method and to obtain variables for statistical reference. Thirty-five patients operated on for unilateral cleft lip and palate (cleft group) were then analysed and compared with the control group. Individual scores were obtained for each patient, computed, and correlated with those established by a lay panel. Statistical analysis showed good sensitivity and reliability (R>0.8).  相似文献   
53.
Manipulation of gamma-aminobutyrate (GABA) system has been little studied in Parkinson's disease, despite the fact that GABA subserves a large part of the basal ganglia, including the outflow tracts. To test whether antagonism of GABA could improve features of PD, we administered open label intravenous flumazenil to eight practically defined off patients and assessed UPDRS scores, bilateral 1-minute hand-tapping speed, and timed gait tests. Patients demonstrated significantly greater tapping speed, which peaked 40 minutes after injection (P < 0.05). Total motor Unified Parkinson's Disease Rating Scale scores modestly improved (P < 0.05). There were no adverse events. Mechanisms by which flumazenil could improve PD are discussed.  相似文献   
54.
55.
Eight cases of malignant and 12 0f benign Bren- ner tumor are reported, patient ages ranged 31 69 and 39-53 years. The malignant tumor was bilateral in 6 0f 8 cases, and the benign in l of 12. The greatest diameter of the malignant tumors averaged around 11 cm, and the benign 10. Six of the malignant Brenner tumor patients died, one was lost to follow up, and one survived for 10 years. Pathologic and microscopic findings were pre- sented in some detail. Based on the analysis of the association between the histologic features and type of Mullerian epithelium, we believe that the so called Brenner tumor is in effect a tumor arising from the Mullerian epithelium with a tendency to differentiate into vaginocervical type epithelium.  相似文献   
56.
OBJECTIVE: Health systems throughout much of the world have been subject to 'reform' in recent years as countries have attempted to contain the rapidly rising costs of health care. Changes to hospital structures (restructuring) have been an important part of these reforms. A significant impact of current approaches to restructuring is the loss of, or changes to, nursing management roles and functions. SETTING: Australian hospitals PRIMARY ARGUMENT: Little evaluation has been undertaken to determine the impact of hospital structure and organisational restructuring on the nursing workforce. CONCLUSIONS: There is some indication that nurses have experienced a loss of key management positions, which may impact on their capacity to ensure that adequate and safe care is provided at the ward level.  相似文献   
57.
58.
介入手术治疗异位妊娠12例临床分析   总被引:1,自引:0,他引:1  
目的:探索一种治疗输卵管妊娠的微创介入手术,解决因其腹腔出血不能接受保守治疗或保守治疗失败的难题。保持输卵管完整及通畅,满足有生育需求的患。方法:对12例输卵管妊娠妇女行对侧股动脉穿刺,将导管超选择插至子宫动脉以甲氨喋呤(MTX)进行灌注及明胶海绵栓塞术。结果:本组病例中,术后10dB超复查孕囊脱落、吸收消失,栓塞后盆腔活动性出血停止。结论:介入治疗宫外孕输卵管妊娠,能有效杀灭胚胎组织,栓塞破裂血管止血效果明显,且能保持输卵管通畅。  相似文献   
59.
60.
We present a case of benign osteoblastoma of the occipital bone. Benign osteoblastoma is an uncommon primary bone tumor, which usually involves the vertebrae and the long bones. This tumor rarely develops in the calvaria, showing a preference for the temporal and frontal bones when it does. To the best of our knowledge, this case is only the eighth reported case of benign osteoblastoma confined to the occipital bone. A 20‐year‐old male presented with a mild tender mass lesion of the occipital area, just below the lambda. Plain X‐ray films and CT scans demonstrated an osteolytic mass surrounded by the sclerotic rim within the diploic space. MRI proved to be effective for the evaluation of the intracranial and intraosseous extensions of the tumor. However, it was very difficult to formulate a differential diagnosis against other osteoblastic tumors, or osteoid osteoma, in view of its radiological appearance. The final diagnosis was obtained by careful consideration of the histopathological characteristics of the tumor combined with its clinical and radiological features. Although generally regarded as benign, a complete resection is preferred over conventional curettage as this can guard against possible recurrence and malignant transformation.  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