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   883篇
  免费   60篇
  国内免费   21篇
耳鼻咽喉   5篇
儿科学   12篇
妇产科学   6篇
基础医学   78篇
口腔科学   8篇
临床医学   129篇
内科学   100篇
皮肤病学   2篇
神经病学   41篇
特种医学   41篇
外科学   29篇
综合类   184篇
预防医学   189篇
眼科学   8篇
药学   93篇
中国医学   19篇
肿瘤学   20篇
  2023年   8篇
  2022年   19篇
  2021年   40篇
  2020年   33篇
  2019年   32篇
  2018年   29篇
  2017年   26篇
  2016年   19篇
  2015年   24篇
  2014年   59篇
  2013年   63篇
  2012年   62篇
  2011年   58篇
  2010年   40篇
  2009年   43篇
  2008年   73篇
  2007年   49篇
  2006年   38篇
  2005年   34篇
  2004年   67篇
  2003年   23篇
  2002年   19篇
  2001年   13篇
  2000年   17篇
  1999年   24篇
  1998年   7篇
  1997年   5篇
  1996年   4篇
  1995年   4篇
  1994年   3篇
  1993年   2篇
  1992年   4篇
  1991年   1篇
  1990年   1篇
  1989年   1篇
  1988年   1篇
  1987年   2篇
  1985年   5篇
  1984年   3篇
  1983年   2篇
  1982年   2篇
  1981年   2篇
  1976年   1篇
  1974年   1篇
  1969年   1篇
排序方式: 共有964条查询结果,搜索用时 31 毫秒
1.
美国食品药品管理局(FDA)于2022年7月发布了"治疗等效性评价供企业用指导原则"(草案)。该指导原则阐明了FDA治疗等效性的标准以及治疗等效性编码系统,目的是准确评价仿制药与参比制剂的治疗等效性并通过治疗等效性代码,在"橙皮书"中迅速检索到治疗等效的仿制药。而中国目前尚无类似的指导原则,详细介绍FDA该指导原则主要内容,期望对中国加强仿制药的治疗等效性评价和加速完善和实施符合国情的治疗等效性编码系统有所帮助。  相似文献   
2.
加强临床试验用药品的闭环管理,对提高临床试验用药品管理质量,保证受试者用药安全具有重要意义。本文通过文献调研临床试验用药品生产制备、流通、回收和销毁等各环节的管理现状及临床试验用药品全生命周期的信息化管理现状,结合同济大学附属杨浦医院在临床试验用药品流通管理过程中发现的问题,提出信息追溯技术在临床试验用药品全生命周期闭环管理中的应用设想。该文对追溯码在临床试验用药品信息追溯管理应用的可行性进行分析,并对临床试验用药品信息追溯体系建设提出几点建议。  相似文献   
3.
目的构建一个以二维码作为电子诊疗卡替代医院传统诊疗卡的系统。方法依托医院微医疗平台,对患者唯一标识和时间戳进行MD5计算生成字符串,并以此内容生成二维码作为电子诊疗卡,同时对HIS进行相应改造,实现电子诊疗卡在全院的应用。结果利用时间戳和MD5签名生成二维码保证了电子诊疗卡加密的唯一性、时效性,医院每年节约成本5万元,患者每次就诊时间减少5 min,提升了患者满意度。结论本文构建的二维码电子诊疗卡系统,解决了使用实体诊疗卡过程中经常出现的忘带卡和重复办卡等问题,提高了医院服务质量,改善了患者就医体验。  相似文献   
4.
The developing nervous system generates remarkably precise synaptic connections between neurons and their postsynaptic target cells. Numerous neural cell adhesion proteins have been identified to mediate cell recognition between synaptic partners in several model organisms. Here, I review the role of protein interactions of cell adhesion molecules in neural circuit assembly and address how these interactions are utilized to form different neural circuitries in different species. The emerging evidence suggests that the extracellular trans-interactions of cell adhesion proteins for neural wiring are evolutionarily conserved across taxa, but they are often used in different steps of circuit assembly. I also highlight how these conserved protein interactions work together as a group to specify neural connectivity.  相似文献   
5.
Since 2016, Ethiopia has passed several proclamations and directives to regulate the promotion of commercial breastmilk substitute (BMS). Ethiopia's market potential will undoubtedly be the gravitating point for international infant formula companies due to growing urbanization, purchasing power, population, and the relatively low use of BMS to‐date. The aim of this review is to assess the strengths and weaknesses of the existing laws, standards, and monitoring documents used to regulate the marketing of BMSs in Ethiopia and make future recommendations. The study findings highlighted that the regulation on marketing are comprehensive and strong to limit the promotion of infant formula. On the other hand, the regulation on marketing of follow‐up formulas, complementary foods, and growing‐up milk by manufacturers and distributors, media houses, and communication and advertisement agencies are underregulated, especially with regards to the international 69.9 regulation. The monitoring and enforcement of the existing marketing regulations remain limited in the absence of a formal coordination mechanism. Several violations of the national BMS regulations were observed. Forty‐one percent of mothers reported observing the BMS advertising and logos were detected in 36% of health facilities assessed. In 100% of cases, the infant formula labels contained violations. As the lead national authority mandated to regulate food safety, the Ethiopian Food and Drug Authority needs to update its regulations related to the marketing of BMS to fill the loopholes and revise the national law in line with the international code of marketing of BMSs to protect breastfeeding.  相似文献   
6.
BackgroundAs knee osteotomy surgery becomes increasingly accessible, more patients may turn to the Internet for information. This study examined the source, quality, content and readability of online information regarding osteotomy around the knee.MethodsThe first 70 websites returned by the top four search engines were identified using the key words: “knee osteotomy” and “high tibial osteotomy.” The websites were categorised by type and assessed using the DISCERN score, Journal of the American Medical Association (JAMA) benchmark criteria and a novel Knee Osteotomy-Specific Score (KOSS). The presence of the Health On the Net (HON) code accreditation seal was noted. Readability of each website was assessed using eight readability formulae. The mean reading grade level (RGL) was compared to the 6th and 8th grade reading levels. The mean RGL of each category was also compared.ResultsOf the 45 unique websites analysed, the majority were Physician (33%) and Journal websites (31%). The mean DISCERN score was 36.7 (±8.9) which is classified as ‘poor.’ The mean JAMA benchmark criteria score was 2.04 (±1.5) and Physician websites were most likely to be scored zero. The mean KOSS was 15.4 (±5.7). The highest scoring website was a Commercial site but, overall, Journal category sites provided the best quality information. Websites that bore the HONcode seal obtained higher DISCERN, JAMA benchmark criteria and Knee Osteotomy - Specific Scores.The cumulative mean RGL was 13.2 (±2.2) which exceeded the 6th grade level by an average of 7.2 grade levels and the 8th grade level by an average of 5.2 grade levels. No website (0%) was written at or below either the 6th or the 8th grade reading levels. The mean Flesch Reading Ease Score of all websites was 41.13 (±14.7) which is classified as ‘difficult.’ Journal websites had the highest RGL.ConclusionThe information available online regarding osteotomy around the knee varies tremendously in quality and completeness. Physician sites predominate, but these were among the lowest scoring of all websites. Even where high quality information is available, it is set at too high a level to be easily understood.Level of evidenceSurvey of materials – Internet.  相似文献   
7.
The COVID-19 pandemic has made it necessary to find innovative strategies that facilitate safe, private assessment and intervention for intimate partner violence (IPV). IPV is a major source of morbidity and mortality, with women experiencing a lifetime prevalence rate of 22%. Screening pregnant individuals for IPV during the COVID-19 pandemic became critical because a 20% rise in IPV during the pandemic has been estimated. A multidisciplinary stakeholder panel created a process using technology to address this concern. An infographic poster with IPV screening questions and a Quick Response (QR) code was displayed in bathrooms in the perinatal service area. The infographic allowed respondents to signal a safety concern, launching an individualized plan of care to address their needs privately. The pandemic has highlighted how much work needs to be done to ensure that people who experience IPV continue to obtain access to support and health care.  相似文献   
8.
BackgroundObesity is a major health risk factor associated with medical complications, such as cardiovascular disease, that may compromise outcomes. Furthermore, obesity may lead to difficulties in daily life, altering the quality of life and generating psychological disorders such as devalued self-image and depression.ObjectivesThis study evaluated the quality of life and predictive factors of postoperative complications in patients who underwent abdominoplasty after Roux-en-Y gastric bypass.SettingBariatric and postbariatric center, North Wing Regional Hospital, Brasília, Brazil.MethodsData were analyzed from a prospective registry of postbariatric patients who underwent abdominoplasty from January 2011 to December 2016. Variables examined included age, sex, body mass index (BMI), complications, and comorbidities. Multivariate analyses were performed to assess outcome measures. The quality-of-life assessment was measured with the Moorehead-Ardelt quality-of-life questionnaire.ResultsOne hundred and seven postbariatric patients were included. The mean age of the patients was 41 years. BMI at the time of abdominoplasty (current BMI) was 27.6 ± 3.7 kg/m2, and the average weight loss before abdominoplasty was 47.7 ± 17.3 kg. Pre-weight loss BMI (max BMI) was 45.5 ± 7.6 kg/m2, and ?BMI was 18.6 ± 9.3 kg/m2. The overall rate of complications was 23.4%. Among the studied factors in the multivariate analysis, amount of removed tissue in the abdomen >2000 g, ?BMI >20 kg/m2, and age >40 years significantly increased the rates of postoperative complications. In our study, abdominoplasty improved the quality of life of patients (mean quality-of-life scores, 2.1 ± 0.9).ConclusionThe amount of removed tissue in the abdomen, ?BMI >20 kg/m2, and age >40 years led to significantly more complications in patients undergoing abdominoplasty after gastroplasty. In addition, this study demonstrated that abdominoplasty should be proposed to patients with massive weight loss to improve quality of life.  相似文献   
9.
10.
For both the B2O3-Bi2O3-CaO and B2O3-Bi2O3-SrO glass systems, γ-ray and neutron attenuation qualities were evaluated. Utilizing the Phy-X/PSD program, within the 0.015–15 MeV energy range, linear attenuation coefficients (µ) and mass attenuation coefficients (μ/ρ) were calculated, and the attained μ/ρ quantities match well with respective simulation results computed by MCNPX, Geant4, and Penelope codes. Instead of B2O3/CaO or B2O3/SrO, the Bi2O3 addition causes improved γ-ray shielding competence, i.e., rise in effective atomic number (Zeff) and a fall in half-value layer (HVL), tenth-value layer (TVL), and mean free path (MFP). Exposure buildup factors (EBFs) and energy absorption buildup factors (EABFs) were derived using a geometric progression (G–P) fitting approach at 1–40 mfp penetration depths (PDs), within the 0.015–15 MeV range. Computed radiation protection efficiency (RPE) values confirm their excellent capacity for lower energy photons shielding. Comparably greater density (7.59 g/cm3), larger μ, μ/ρ, Zeff, equivalent atomic number (Zeq), and RPE, with the lowest HVL, TVL, MFP, EBFs, and EABFs derived for 30B2O3-60Bi2O3-10SrO (mol%) glass suggest it as an excellent γ-ray attenuator. Additionally, 30B2O3-60Bi2O3-10SrO (mol%) glass holds a commensurably bigger macroscopic removal cross-section for fast neutrons (ΣR) (=0.1199 cm−1), obtained by applying Phy-X/PSD for fast neutrons shielding, owing to the presence of larger wt% of ‘Bi’ (80.6813 wt%) and moderate ‘B’ (2.0869 wt%) elements in it. 70B2O3-5Bi2O3-25CaO (mol%) sample (B: 17.5887 wt%, Bi: 24.2855 wt%, Ca: 11.6436 wt%, and O: 46.4821 wt%) shows high potentiality for thermal or slow neutrons and intermediate energy neutrons capture or absorption due to comprised high wt% of ‘B’ element in it.  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