全文获取类型
收费全文 | 177256篇 |
免费 | 15386篇 |
国内免费 | 1242篇 |
专业分类
耳鼻咽喉 | 2748篇 |
儿科学 | 3518篇 |
妇产科学 | 4392篇 |
基础医学 | 24126篇 |
口腔科学 | 4412篇 |
临床医学 | 18588篇 |
内科学 | 36574篇 |
皮肤病学 | 4667篇 |
神经病学 | 12736篇 |
特种医学 | 8321篇 |
外科学 | 23556篇 |
综合类 | 2174篇 |
现状与发展 | 7篇 |
一般理论 | 81篇 |
预防医学 | 12991篇 |
眼科学 | 4518篇 |
药学 | 13824篇 |
中国医学 | 1597篇 |
肿瘤学 | 15054篇 |
出版年
2023年 | 1990篇 |
2022年 | 3077篇 |
2021年 | 5446篇 |
2020年 | 3584篇 |
2019年 | 3964篇 |
2018年 | 5439篇 |
2017年 | 4329篇 |
2016年 | 5539篇 |
2015年 | 6951篇 |
2014年 | 8783篇 |
2013年 | 10418篇 |
2012年 | 13257篇 |
2011年 | 12807篇 |
2010年 | 8277篇 |
2009年 | 7502篇 |
2008年 | 9801篇 |
2007年 | 9467篇 |
2006年 | 9012篇 |
2005年 | 8253篇 |
2004年 | 7336篇 |
2003年 | 6331篇 |
2002年 | 5501篇 |
2001年 | 4634篇 |
2000年 | 4249篇 |
1999年 | 3500篇 |
1998年 | 1621篇 |
1997年 | 1227篇 |
1996年 | 1171篇 |
1995年 | 1052篇 |
1994年 | 896篇 |
1993年 | 749篇 |
1992年 | 1679篇 |
1991年 | 1656篇 |
1990年 | 1453篇 |
1989年 | 1315篇 |
1988年 | 1218篇 |
1987年 | 1076篇 |
1986年 | 1064篇 |
1985年 | 927篇 |
1984年 | 685篇 |
1983年 | 601篇 |
1982年 | 414篇 |
1981年 | 385篇 |
1980年 | 354篇 |
1979年 | 528篇 |
1978年 | 417篇 |
1977年 | 406篇 |
1976年 | 353篇 |
1974年 | 367篇 |
1973年 | 336篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
1.
2.
3.
Kuo-yi Jade Chang MHealthEc MHM BSc Lisa Lorraine Dillon MSpecEd BPsych Lil Deverell COMS PhD MEd GradDipO&M BEd Mei Ying Boon PhD BOptom FAAO Lisa Keay PhD MPH BOptom 《Clinical & experimental optometry》2020,103(4):434-448
Despite orientation and mobility (O&M) being a significant factor determining quality of life of people with low vision or blindness, there are no gold standard measures or agreement on how to measure O&M performance. In the first part of this systematic review, an inventory of O&M outcome measures used by recent studies to assess the performance of orientation and/or mobility of adults with vision impairment (low vision and blindness) is presented. A wide variety of O&M outcome measures have been implemented in different fields of study, such as epidemiologic research and interventional studies evaluating training, assistive technology, vision rehabilitation and vision restoration. The most frequent aspect of outcome measures is efficiency such as time, distance, speed and percentage of preferred walking speed, followed by obstacle contacts and avoidance, and dis/orientation and veering. Other less commonly used aspects are target identification, safety and social interaction and self-reported outcome measures. Some studies employ sophisticated equipment to capture and analyse O&M performance in a laboratory setting, while others carry out their assessment in real-world indoor or outdoor environments. In the second part of this review, the appropriateness of implementing the identified outcome measures to assess O&M performance in clinical and functional O&M practice is evaluated. Nearly a half of these outcome measures meet all four criteria of face validity (either clinical or functional), responsiveness, reliability and feasibility and have the potential to be implemented in clinical or functional O&M practice. The findings of this review confirm the complicated and dynamic nature of O&M. Multiple measures are required in any evaluation of O&M performance to facilitate holistic assessment of O&M abilities and limitations of each individual. 相似文献
4.
5.
Hyun Jong Choi Jong Ho Moon Yun Nah Lee Hyun Su Kim Ji Su Ha Tae Hoon Lee Sang‐Woo Cha Young Deok Cho Sang‐Heum Park 《Digestive endoscopy》2015,27(7):772-775
Direct peroral cholangioscopy (POC) using an ultra‐slim upper endoscope is one modality of POC for intraductal endoscopic evaluation and treatment of the bile duct. Choledochoduodenostomy (CDS) is one modality of biliary bypass surgery that provides a new route to the bile duct. We carried out direct POC using an ultra‐slim upper endoscope without the use of accessories in 10 patients (four sump syndromes, three bile duct strictures and three intrahepatic duct stones) previously undergoing surgical CDS. Direct POC was successful in all patients. The use of an intraductal balloon catheter was required in one patient for advancement of the endoscope into the bile duct. Distal bile ducts with sump syndromes were cleared using baskets and water irrigation under direct POC. Cholangiocarcinoma was diagnosed in one patient with hilar bile duct stricture after cholangioscopic evaluation and a targeting forceps biopsy under direct POC. Intrahepatic duct stones were successfully extracted after intraductal fragmentation under direct POC. Oozing bleeding occurred during intraductal lithotripsy but stopped spontaneously. Direct POC using an ultra‐slim upper endoscope without the assistance of accessories can easily be carried out in patients undergoing CDS. 相似文献
6.
Nancy C. Lee 《Public health reports (Washington, D.C. : 1974)》2015,130(2):121-Apr;130(2):121
7.
Lauren Tingey Britta Mullany Rachel Chambers Ranelda Hastings Angelita Lee Anthony Parker 《AIDS care》2015,27(9):1087-1097
Potential for widespread transmission of HIV/AIDS among American Indian (AI) adolescents exists, yet no evidence-based interventions (EBIs) have been adapted and evaluated with this population. Intensive psychoeducation may improve knowledge and decision-making which could potentially translate to reductions in HIV risk behaviors. A peer group randomized controlled comparison of an adapted EBI vs. control was delivered over an eight-day summer basketball camp in one reservation-based tribal community to adolescents ages 13–19. Outcome data were gathered immediately post-camp and at 6 and 12 months follow-up. Self-selected peer groups were randomized to intervention (n = 138) or control (n = 129) conditions for a total sample of 267 participants (56.2% female), mean age 15.1 years (SD = 1.7). Intervention participants had better condom use self-efficacy post-camp (Adjusted Mean Difference [AMD] = ?0.75, p < 0.005) and at 6 (AMD = ?0.44, p < 0.005) and 12 months (AMD = ?0.23, p < 0.05) follow-up. Intervention participants also had higher HIV prevention and transmission knowledge (post-camp: AMD = 0.07, p < 0.01; 6 months: AMD = 0.06, p < 0.01) were more likely to believe condoms prevent sexually transmitted infections (post-camp: RR = 1.41, p < 0.005; 6 months: RR = 1.34, p < 0.05), to talk with an adult about HIV/AIDS (post-camp: RR=1.78, p < 0.005; 6 months: RR = 1.14, p < 0.005), had higher partner negotiation efficacy related to substance use during sex (post-camp: AMD = 0.37, p < 0.01), and were more likely to intend to use a condom (post-camp: RR = 1.39, p < 0.01). The adapted intervention had short- and medium-term impacts on AI adolescent risk for HIV/AIDS, but attenuated at 12 months. Intervention delivery through a community-based camp is feasible and acceptable with strong retention. Additional study is needed to evaluate the adapted intervention's impact on sexual risk behaviors and if booster sessions and parent involvement translate to long-term impacts. 相似文献
8.
9.
10.