全文获取类型
收费全文 | 2094篇 |
免费 | 124篇 |
国内免费 | 60篇 |
专业分类
电工技术 | 54篇 |
技术理论 | 1篇 |
综合类 | 309篇 |
化学工业 | 70篇 |
金属工艺 | 25篇 |
机械仪表 | 91篇 |
建筑科学 | 262篇 |
矿业工程 | 25篇 |
能源动力 | 25篇 |
轻工业 | 56篇 |
水利工程 | 55篇 |
石油天然气 | 7篇 |
武器工业 | 6篇 |
无线电 | 130篇 |
一般工业技术 | 161篇 |
冶金工业 | 72篇 |
原子能技术 | 101篇 |
自动化技术 | 828篇 |
出版年
2024年 | 3篇 |
2023年 | 28篇 |
2022年 | 37篇 |
2021年 | 45篇 |
2020年 | 83篇 |
2019年 | 36篇 |
2018年 | 30篇 |
2017年 | 54篇 |
2016年 | 59篇 |
2015年 | 55篇 |
2014年 | 136篇 |
2013年 | 103篇 |
2012年 | 137篇 |
2011年 | 175篇 |
2010年 | 125篇 |
2009年 | 120篇 |
2008年 | 143篇 |
2007年 | 121篇 |
2006年 | 133篇 |
2005年 | 92篇 |
2004年 | 95篇 |
2003年 | 109篇 |
2002年 | 57篇 |
2001年 | 54篇 |
2000年 | 50篇 |
1999年 | 34篇 |
1998年 | 23篇 |
1997年 | 12篇 |
1996年 | 19篇 |
1995年 | 10篇 |
1994年 | 11篇 |
1993年 | 7篇 |
1992年 | 4篇 |
1991年 | 7篇 |
1990年 | 4篇 |
1989年 | 4篇 |
1988年 | 3篇 |
1987年 | 5篇 |
1986年 | 4篇 |
1985年 | 9篇 |
1983年 | 7篇 |
1982年 | 3篇 |
1977年 | 3篇 |
1970年 | 2篇 |
1966年 | 2篇 |
1965年 | 3篇 |
1961年 | 3篇 |
1960年 | 3篇 |
1959年 | 3篇 |
1955年 | 2篇 |
排序方式: 共有2278条查询结果,搜索用时 9 毫秒
1.
《Planning》2015,(3)
为了培养青年医师运用医学科普语言传播医学知识的能力,向社会提供更优质、可及的健康知识,改善医患关系,促进社会和谐;同时出于向社区、媒体推送一批优秀青年医学科普人才的考虑,本文在总结北京协和医院培养青年医务人员医学科普能力经验的基础上,尝试构建一套适合大型公立医院(尤其是教学医院)培养青年医务人员医学科普能力的新模式——“科普训练营”。本文旨在系统介绍该模式的产生背景、实践经验及初期效果,阐释实施后的重要意义,及实施过程中的挑战与应对策略。 相似文献
2.
Wesley W. Chu Ph.D. Ion T. leong Ph.D. Ricky K. Taira Ph.D. 《The VLDB Journal The International Journal on Very Large Data Bases》1994,3(4):445-477
We introduce a semantic data model to capture the hierarchical, spatial, temporal, and evolutionary semantics of images in pictorial databases. This model mimics the user's conceptual view of the image content, providing the framework and guidelines for preprocessing to extract image features. Based on the model constructs, a spatial evolutionary query language (SEQL), which provides direct image object manipulation capabilities, is presented. With semantic information captured in the model, spatial evolutionary queries are answered efficiently. Using an object-oriented platform, a prototype medical-image management system was implemented at UCLA to demonstrate the feasibility of the proposed approach. 相似文献
3.
Gregory S. Zaric Jeffrey S. Hoch 《International Transactions in Operational Research》2006,13(6):493-513
Interest in medical savings accounts (MSAs) as a potential tool to reduce healthcare costs has been widespread. A small number of countries have either implemented or run pilot programs of MSAs, and vigorous policy debates have taken place in several other countries about the potential merits of introducing MSAs as a method of paying for health care. In this paper we develop a model to assess the cost saving potential of MSAs in a publicly funded healthcare system. We assume that the public healthcare payer may choose between reimbursing healthcare expenditures through an MSA or through a form of third‐party payer insurance. We use the model to identify the conditions under which MSAs may reduce costs. We illustrate using data on healthcare expenditures from Canada. 相似文献
4.
R. Adam Rebeles A. Hermanne S. Takcs F. Trknyi S.F. Kovalev A. Ignatyuk 《Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms》2007,260(2):672-684
In the frame of a systematic study of light ion induced threshold reactions on natural tin (Sn) excitation functions for alpha particles induced reactions are presented in a 12–38 MeV energy domain. Using a stacked foil activation method the following radioisotopes were identified: 116Te, 117Te, 118Te, 119Te, 121Te, 123Te, 117Sb, 118Sb, 120Sb, 122Sb, 124Sb, 126Sb, 117Sn, 111In. The experimental cross sections for these isotopes are presented for the first time in this energy range and a direct comparison with values calculated with the ALICE-IPPE code is discussed. Possible use of these data for production of some isotopes relevant in nuclear medicine is suggested. 相似文献
5.
K. W. Dalgarno J. H. Pallari J. Woodburn K. Xiao D. J. Wood R. D. Goodridge C. Ohtsuki 《Virtual and Physical Prototyping》2006,1(3):137-145
The medical field is one in which the need for customization can be clear cut, as providing tailored devices and implants for unique physiologies can provide for a better overall treatment than the use of 'off the shelf' devices and implants. Customization in the production of medical products can be roughly divided into consideration of medical devices, and of implantable parts or systems. The present paper outlines the current state of the art in both of these areas, presents details of projects that are ongoing at the University of Leeds and outlines future research directions. 相似文献
6.
本文报道从1984年6月1日至1985年5月31日对宝鸡市五县(区)医用诊断 X 线照射频度的调查结果。结果表明,胸透和群检胸透医照率最高,占医疗照射总人次数的68.7%,门诊医照率为70.8人次/千人·年,人群受照率为344。5人次/千人·年。按年龄比较,青壮年组医照率最高,占医照总人次数的57.2%。按性别比较,男性多于女性。 相似文献
7.
《VisualFoxPro程序设计》是医学院校普遍开设的计算机课程,结合医学院校中《VisualFox—Pro程序设计》课程特点,提出在课堂教学过程巧用启发式教学。并结合教学实例说明启发式教学能充分调动学生积极性,使学生真正参与课堂.从而取得好的教学效果。 相似文献
8.
《Displays》2021
Medical image segmentation is the most complex and important task in the field of medical image processing and analysis, as it is linked to disease diagnosis accuracy. However, due to the medical image's high complexity and noise, segmentation performance is limited. We propose a novel quadratic polynomial guided fuzzy C-means and dual attention mechanism composite network model architecture to address the aforementioned issues (QPFC-DA). It has mechanisms for channel and spatial edge attention, which guide the content and edge segmentation branches, respectively. The bi-directional long short-term memory network was added after the two content segmentation branches to better integrate multi-scale features and prevent the loss of important features. Furthermore, the fuzzy C-means algorithm guided by the quadratic polynomial can better distinguish the image's weak edge regions and has a degree of noise resistance, resulting in a membership matrix with less ambiguity and a more reliable segmentation result. We also conducted comparison and ablation experiments on three medical data sets. The experimental results show that this method is superior to several other well-known methods. 相似文献
9.
随着各类医用耗材、消毒品数量和种类的增加,医院物资管理在医院运营中的作用越来越显著。在提倡以患者为中心,提高患者满意度的宗旨下,与患者直接接触的HIS、LIS、PACS、CIS等医疗系统发展十分迅速,而医院内部使用的物资管理系统却比较落后。针对在医院实际医用物资管理中,时常发生医疗物资积压和医疗耗材缺货导致医疗时机延误等问题,对现有物资管理系统中的不足进行分析,并提出一种以零库存管理为基础的新工作流程,以解决现有的一些问题,并在继续深入探讨和研究。 相似文献
10.
Te-Yung Fang Pa-Chun Wang Chih-Hsien Liu Mu-Chun Su Shih-Ching Yeh 《Computer methods and programs in biomedicine》2014