全文获取类型
收费全文 | 2243篇 |
免费 | 413篇 |
国内免费 | 33篇 |
专业分类
耳鼻咽喉 | 6篇 |
儿科学 | 37篇 |
妇产科学 | 13篇 |
基础医学 | 76篇 |
口腔科学 | 18篇 |
临床医学 | 222篇 |
内科学 | 159篇 |
皮肤病学 | 9篇 |
神经病学 | 42篇 |
特种医学 | 18篇 |
外科学 | 708篇 |
综合类 | 297篇 |
一般理论 | 9篇 |
预防医学 | 861篇 |
眼科学 | 4篇 |
药学 | 104篇 |
中国医学 | 79篇 |
肿瘤学 | 27篇 |
出版年
2023年 | 47篇 |
2022年 | 63篇 |
2021年 | 163篇 |
2020年 | 190篇 |
2019年 | 161篇 |
2018年 | 144篇 |
2017年 | 155篇 |
2016年 | 111篇 |
2015年 | 109篇 |
2014年 | 175篇 |
2013年 | 198篇 |
2012年 | 123篇 |
2011年 | 166篇 |
2010年 | 117篇 |
2009年 | 105篇 |
2008年 | 106篇 |
2007年 | 75篇 |
2006年 | 68篇 |
2005年 | 75篇 |
2004年 | 53篇 |
2003年 | 59篇 |
2002年 | 29篇 |
2001年 | 25篇 |
2000年 | 25篇 |
1999年 | 19篇 |
1998年 | 21篇 |
1997年 | 16篇 |
1996年 | 11篇 |
1995年 | 11篇 |
1994年 | 10篇 |
1993年 | 10篇 |
1992年 | 2篇 |
1991年 | 7篇 |
1990年 | 1篇 |
1989年 | 5篇 |
1988年 | 3篇 |
1987年 | 5篇 |
1986年 | 5篇 |
1985年 | 4篇 |
1984年 | 3篇 |
1983年 | 1篇 |
1982年 | 2篇 |
1981年 | 3篇 |
1980年 | 2篇 |
1978年 | 1篇 |
1977年 | 1篇 |
1976年 | 2篇 |
1975年 | 1篇 |
1974年 | 1篇 |
排序方式: 共有2689条查询结果,搜索用时 15 毫秒
1.
2.
以浙江省首届“云馆配”图书展示会为例,介绍了“云馆配”采访模式的具体实践,对“云馆配”与现场采访、征订目录采访、读者荐购、读者决策采购等不同采访模式进行了比较,指出了各种模式的优势与不足,提出了“云馆配”采访模式的优化发展策略。认为“云馆配”立足用户需求,不仅使图书馆(用户)、馆配商、出版社三方得到了及时、有效的沟通,还成为读者决策采购的一种新的积极尝试。“云馆配”采访模式已在疫情期间得到了较好应用,未来可辅助日常图书采访。 相似文献
3.
4.
《Vaccine》2021,39(17):2434-2444
BackgroundAchieving universal immunization coverage and reaching every child with life-saving vaccines will require the implementation of pro-equity immunization strategies, especially in poorer countries. Gavi-supported countries continue to implement and report strategies that aim to address implementation challenges and improve equity. This paper summarizes the first mapping of these strategies from country reports.MethodsThirteen Gavi-supported countries were purposively selected with emphasis on Gavi’s priority countries. Following a scoping of different documents submitted to Gavi by countries, 47 Gavi Joint Appraisals (JAs) for the period 2016–2019 from the 13 selected countries were included in the mapping. We used a consolidated framework synthesized from 16 different equity and health systems frameworks, which incorporated UNICEF’s coverage and equity assessment approach – an adaptation of the Tanahashi model. Using search terms, the mapping was conducted using a combination of manual search and the MAXQDA qualitative analysis tool. Pro-equity strategies meeting the inclusion criteria were identified and compiled in an Excel database, and then populated on a tableau visualization dashboard.ResultsIn total, 258 pro-equity strategies were implemented by the 13 sampled Gavi-supported countries between 2016 and 2019. The framework determinants of social norms, utilization, and management and coordination accounted for more than three-quarters of all pro-equity strategies implemented in these countries. The median number of strategies reported per country was 17. Afghanistan, Nigeria, and Uganda reported the highest number of strategies that we considered as pro-equity.ConclusionFindings from this mapping can be useful in addressing equity gaps, reaching partially immunized, and ‘zero-dose’ vaccinated children, and valuable resource for countries planning to implement pro-equity strategies, especially as immunization stakeholders reimagine immunization delivery in light of COVID-19, and as Gavi finalizes its fifth organizational strategy. Future efforts should seek to identify pro-equity strategies being implemented across additional countries, and to assess the extent to which these strategies have improved immunization coverage and equity. 相似文献
5.
6.
Jeremy R. Garrett Leslie Ann McNolty Ian D. Wolfe John D. Lantos 《The Hastings Center report》2020,50(3):79-80
The pandemic creates unprecedented challenges to society and to health care systems around the world. Like all crises, these provide a unique opportunity to rethink the fundamental limiting assumptions and institutional inertia of our established systems. These inertial assumptions have obscured deeply rooted problems in health care and deflected attempts to address them. As hospitals begin to welcome all patients back, they should resist the temptation to go back to business as usual. Instead, they should retain the more deliberative, explicit, and transparent ways of thinking that have informed the development of crisis standards of care. The key lesson to be learned from those exercises in rational deliberation is that justice must be the ethical foundation of all standards of care. Justice demands that hospitals take a safety-net approach to providing services that prioritizes the most vulnerable segments of society, continue to expand telemedicine in ways that improve access without exacerbating disparities, invest in community-based care, and fully staff hospitals and clinics on nights and weekends. 相似文献
7.
《Health policy (Amsterdam, Netherlands)》2020,124(5):491-500
IntroductionLong-term care (LTC) is organized in a fragmented manner. Payer agencies (PA) receive LTC funds from the agency collecting funds, and commission services. Yet, distributional equity (DE) across PAs, a precondition to geographical equity of access to LTC, has received limited attention. We conceptualize that LTC systems promote DE when they are designed to set eligibility criteria nationally (vs. locally); and to distribute funds among PAs based on needs-formula (vs. past-budgets or government decisions).ObjectivesThis cross-country study highlights to what extent different LTC systems are designed to promote DE across PAs, and the parameters used in allocation formulae.MethodsQualitative data were collected through a questionnaire filled by experts from 17 OECD countries.Results11 out of 25 LTC systems analyzed, fully meet DE as we defined. 5 systems which give high autonomy to PAs have designs with low levels of DE; while nine systems partially promote DE. Allocation formulae vary in their complexity as some systems use simple demographic parameters while others apply socio-economic status, disability, and LTC cost variations.Discussion and conclusionsA minority of LTC systems fully meet DE, which is only one of the criteria in allocation of LTC resources. Some systems prefer local priority-setting and governance over DE. Countries that value DE should harmonize the eligibility criteria at the national level and allocate funds according to needs across regions. 相似文献
8.
Jin Ge Emily R. Perito John Bucuvalas Richard Gilroy Evelyn K. Hsu John P. Roberts Jennifer C. Lai 《American journal of transplantation》2020,20(4):1116-1124
Split liver transplantation (SLT) is 1 strategy for maximizing the number of deceased donor liver transplants. Recent reports suggest that utilization of SLT in the United States remains low. We examined deceased donor offers that were ultimately split between 2010 and 2014. SLTs were categorized as “primary” and “secondary” transplants. We analyzed allocation patterns and used logistic regression to evaluate factors associated with secondary split discard. Four hundred eighteen livers were split: 54% from adult, 46% from pediatric donors. Of the 227 adult donor livers split, 61% met United Network for Organ Sharing “optimal” split criteria. A total of 770 recipients (418 primary and 352 secondary) were transplanted, indicating 16% discard. Ninety‐two percent of the 418 primary recipients were children, and 47% were accepted on the first offer. Eighty‐seven percent of the 352 secondary recipients were adults, and 7% were accepted on the first offer. Of the 352 pairs, 99% were transplanted in the same region, 36% at the same center. In logistic regression, shorter donor height was associated with secondary discard (odds ratio 0.97 per cm, 95% CI 0.94‐1.00, P = .02). SLT volume by center was not predictive of secondary discard. Current policy proposals that incentivize SLT in the United States could increase the number of transplants to children and adults. 相似文献
9.
As the coronavirus pandemic extends to low and middle income countries (LMICs), there are growing concerns about the risk of coronavirus disease (COVID-19) in populations with high prevalence of comorbidities, the impact on health and economies more broadly and the capacity of existing health systems to manage the additional burden of COVID-19. The direct effects of COVID are less of a concern in children, who seem to be largely asymptomatic or to develop mild illness as occurs in high income countries; however children in LMICs constitute a high proportion of the population and may have a high prevalence of risk factors for severe lower respiratory infection such as HIV or malnutrition. Further diversion of resources from child health to address the pandemic among adults may further impact on care for children. Poor living conditions in LMICs including lack of sanitation, running water and overcrowding may facilitate transmission of SARS-CoV-2. The indirect effects of the pandemic on child health are of considerable concern, including increasing poverty levels, disrupted schooling, lack of access to school feeding schemes, reduced access to health facilities and interruptions in vaccination and other child health programs. Further challenges in LMICs include the inability to implement effective public health measures such as social distancing, hand hygiene, timely identification of infected people with self-isolation and universal use of masks. Lack of adequate personal protective equipment, especially N95 masks is a key concern for health care worker protection. While continued schooling is crucial for children in LMICs, provision of safe environments is especially challenging in overcrowded resource constrained schools. The current crisis is a harsh reminder of the global inequity in health in LMICs. The pandemic highlights key challenges to the provision of health in LMICs, but also provides opportunities to strengthen child health broadly in such settings. 相似文献
10.