全文获取类型
收费全文 | 29753篇 |
免费 | 2962篇 |
国内免费 | 121篇 |
专业分类
耳鼻咽喉 | 389篇 |
儿科学 | 713篇 |
妇产科学 | 547篇 |
基础医学 | 3624篇 |
口腔科学 | 7531篇 |
临床医学 | 2394篇 |
内科学 | 5062篇 |
皮肤病学 | 543篇 |
神经病学 | 2479篇 |
特种医学 | 570篇 |
外科学 | 2641篇 |
综合类 | 124篇 |
一般理论 | 12篇 |
预防医学 | 2363篇 |
眼科学 | 245篇 |
药学 | 1705篇 |
中国医学 | 84篇 |
肿瘤学 | 1810篇 |
出版年
2024年 | 45篇 |
2023年 | 551篇 |
2022年 | 490篇 |
2021年 | 924篇 |
2020年 | 699篇 |
2019年 | 744篇 |
2018年 | 1081篇 |
2017年 | 990篇 |
2016年 | 1051篇 |
2015年 | 1227篇 |
2014年 | 1399篇 |
2013年 | 1674篇 |
2012年 | 2163篇 |
2011年 | 2255篇 |
2010年 | 1454篇 |
2009年 | 1490篇 |
2008年 | 1812篇 |
2007年 | 1755篇 |
2006年 | 1566篇 |
2005年 | 1463篇 |
2004年 | 1383篇 |
2003年 | 1245篇 |
2002年 | 1108篇 |
2001年 | 329篇 |
2000年 | 271篇 |
1999年 | 306篇 |
1998年 | 397篇 |
1997年 | 364篇 |
1996年 | 300篇 |
1995年 | 294篇 |
1994年 | 262篇 |
1993年 | 209篇 |
1992年 | 205篇 |
1991年 | 135篇 |
1990年 | 141篇 |
1989年 | 81篇 |
1988年 | 117篇 |
1987年 | 100篇 |
1986年 | 70篇 |
1985年 | 102篇 |
1984年 | 93篇 |
1983年 | 89篇 |
1982年 | 73篇 |
1981年 | 57篇 |
1980年 | 26篇 |
1979年 | 26篇 |
1978年 | 30篇 |
1976年 | 21篇 |
1975年 | 24篇 |
1974年 | 24篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
5.
Mark Koday DDS Stephen Davis DDS Molly Melbye DDS MPH 《Journal of public health dentistry》2020,80(Z2):S114-S116
The Yakima Valley Farm Workers Clinic (YVFWC) is one of the largest community health centers in the country with clinics throughout south-central Washington and northern Oregon. Its dental program consists of 14 dental clinics providing general and specialty services to the low-income populations it serves. Modeling itself after the YVFWC medical managed care program; the Dental program recently added value-based metrics to its dental practice after Oregon offered a value-based dental reimbursement plan in 2019. This is the first-step YVFWC's dental program that has taken to prepare for value-based reimbursement and transform its dental practice in order to reduce the disease burden in its patient population. The purpose of this article is to describe the processes YVFWC undertook to prepare itself for the new reimbursement model, which included the development of metrics, a metric validation process, a clinical dashboard, and a method for improving metrics. It also outlines its medical/dental integration improvement brought about by embedding hygienists into the medical primary care teams. 相似文献
6.
7.
Ariel Paracampo Marina Solis Carlos Bonetto 《International journal of environmental health research》2015,25(1):96-103
Chlorpyrifos is the most used insecticide in Argentina. Cnesterodon decemmaculatus is a widely distributed, endemic fish from Neotropical America. It attains high densities in the shallow water assemblages of Argentina and Brazil. The aim of this study was to assess the acute toxicity of chlorpyrifos to C. decemmaculatus. The mean 96-h LC50 of three independent determinations was 105.3 (±?3.1) μg/L. Sublethal effects were observed. Swimming behavioral changes at each chlorpyrifos exposure concentration were reported. C. decemmaculatus represents a good model for ecotoxicological risk assessment. 相似文献
8.
9.
Khaled Adil Marija Popovic Fabio L. Cury Sergio L. Faria Marie Duclos Luis Souhami 《Practical radiation oncology》2019,9(1):24-28
Purpose
This study aimed to investigate 3 planning target volume (PTV) margin expansions and determine the most appropriate volume to be used in bladder preservation therapy when using daily cone beam computed tomography (CBCT). We aimed to establish whether a smaller PTV expansion is feasible without risking geographical miss.Methods and materials
The study included patients with bladder cancer who were treated with a hypofractionated course of radiation therapy delivered with intensity modulated radiation therapy. The clinical target volume (CTV) was the whole empty bladder, and the PTV consisted of a 1.5-cm margin around the bladder (PTV1.5 cm). Patients underwent daily CBCT imaging before treatment to assess the bladder volume and ensure accurate positioning. We investigated 2 additional smaller PTV margin expansions to determine the most appropriate volume to be used with CBCT as a daily image guided radiation therapy modality. These margins were created retrospectively on every CBCT. The first additional volume was a uniform PTV margin of the surrounding 1 cm (PTV1 cm). When considering that the majority of the internal bladder movement was due to the variation in filling that occurs in the superior and anterior directions, a second volume of an anisotropic PTV margin with a 1.5-cm superior/anterior and 1 cm in other directions (PTV1/1.5 cm) was created. We recorded the frequency and measured the volume of bladder falling out of each PTV based on the daily CBCT.Results
For the purpose of this study, we considered an arbitrary 5 cm3 of CTV falling out of the designated PTV as a clinically significant volumetric miss. The frequency of such a miss when applying the uniform PTV1 cm was 1%. However, when applying the uniform PTV1.5 cm and anisotropic PTV1/1.5 cm margins, the frequency was 0.5% and 0.5%, respectively.Conclusions
The anisotropic PTV expansion of 1.5 cm superiorly and anteriorly and 1 cm in all other directions around the bladder (CTV) provides a safe PTV approach when daily CBCT imaging is used to localize an empty bladder. 相似文献10.