全文获取类型
收费全文 | 9096篇 |
免费 | 844篇 |
国内免费 | 580篇 |
专业分类
电工技术 | 882篇 |
技术理论 | 1篇 |
综合类 | 1152篇 |
化学工业 | 1105篇 |
金属工艺 | 692篇 |
机械仪表 | 717篇 |
建筑科学 | 1357篇 |
矿业工程 | 231篇 |
能源动力 | 543篇 |
轻工业 | 534篇 |
水利工程 | 304篇 |
石油天然气 | 439篇 |
武器工业 | 120篇 |
无线电 | 394篇 |
一般工业技术 | 806篇 |
冶金工业 | 494篇 |
原子能技术 | 141篇 |
自动化技术 | 608篇 |
出版年
2024年 | 40篇 |
2023年 | 112篇 |
2022年 | 228篇 |
2021年 | 277篇 |
2020年 | 296篇 |
2019年 | 222篇 |
2018年 | 225篇 |
2017年 | 277篇 |
2016年 | 289篇 |
2015年 | 324篇 |
2014年 | 528篇 |
2013年 | 524篇 |
2012年 | 624篇 |
2011年 | 703篇 |
2010年 | 467篇 |
2009年 | 542篇 |
2008年 | 453篇 |
2007年 | 585篇 |
2006年 | 554篇 |
2005年 | 477篇 |
2004年 | 436篇 |
2003年 | 380篇 |
2002年 | 327篇 |
2001年 | 286篇 |
2000年 | 239篇 |
1999年 | 198篇 |
1998年 | 147篇 |
1997年 | 145篇 |
1996年 | 116篇 |
1995年 | 96篇 |
1994年 | 65篇 |
1993年 | 55篇 |
1992年 | 56篇 |
1991年 | 48篇 |
1990年 | 28篇 |
1989年 | 33篇 |
1988年 | 26篇 |
1987年 | 15篇 |
1986年 | 14篇 |
1985年 | 7篇 |
1984年 | 10篇 |
1983年 | 6篇 |
1982年 | 5篇 |
1981年 | 9篇 |
1980年 | 6篇 |
1979年 | 3篇 |
1978年 | 2篇 |
1976年 | 2篇 |
1975年 | 2篇 |
1965年 | 2篇 |
排序方式: 共有10000条查询结果,搜索用时 84 毫秒
21.
Yu. V. Balaban-Irmenin N. G. Fokina 《Power Technology and Engineering (formerly Hydrotechnical Construction)》2007,41(5):306-312
The effect of internal-corrosion inhibitors on heating-system pipelines is investigated. Tests were conducted on a testing
device for polarization measurements under conditions corresponding to the Rostov Heat-Supply System. The concentration of
OEDP-zinc, which provides a high degree of protection from general corrosion, is determined. The reagent has been successfully
incorporated into the Rostov No. 2 TPP.
__________
Translated from élektricheskie Stantsii, No. 7, July 2007, pp. 37–43. 相似文献
22.
Yu. V. Balaban-Irmenin N. G. Fokina 《Power Technology and Engineering (formerly Hydrotechnical Construction)》2007,41(4):228-232
The reliability of heat-supply systems is determined primarily by internal corrosion of the pipelines. The concentration of
oxygen in the water exerts a major influence on the corrosion. In systems with a standard oxygen content, OéDF-Zn is a highly
effective corrosion inhibitor. However, there are systems in which the quality of deaeration of the make-up water of the heat-supply
system is low (or deaeration is nonexistent), and the concentration of oxygen is considerably above the standard value. Classed
among these systems, for example, are the HWS systems, which are incorporated into closed heat-supply systems. The oxygen
concentration in these systems is analyzed to assess the situation.
__________
Translated from élektricheskie Stantsii, No. 6, June 2007, pp. 35–39. 相似文献
23.
R. P. Okatov F. K. Nizametdinov B. N. Tsai T. T. Bondarenko 《Journal of Mining Science》2003,39(2):139-142
Using the synthesis of the kinetic concept on solid strength and the Coulomb - Mohr strength theory as the base, the failure conditions taking into account the time and temperature factors are obtained. 相似文献
24.
骨折内固定材料的研究进展 总被引:1,自引:0,他引:1
传统的骨折内固定材料在临床应用过程中出现了许多亟待解决的问题,如应力遮挡等,这些问题不但与材料的设计有关,而且与所采用的材料有密切关系.在概述骨折内固定材料的发展历史及目前所存在的主要问题的基础上,阐述了骨折内固定材料近些年来的新进展及今后的发展前景. 相似文献
25.
Numerical Modeling of Silicon Photodiodes for High-Accuracy Applications Part I. Simulation Programs
Jon Geist Deane Chandler-Horowitz A. M. Robinson C. R. James 《Journal of research of the National Institute of Standards and Technology》1991,96(4):463-469
The suitability of the semiconductor-device modeling program PC-1D for high-accuracy simulation of silicon photodiodes is discussed. A set of user interface programs optimized to support high-accuracy batch-mode operation of PC-1D for modeling the internal quantum efficiency of photodiodes is also described. The optimization includes correction for the dark current under reverse- and forward-bias conditions before calculating the quantum efficiency, and easy access to the highest numerical accuracy available from PC-1D, neither of which is conveniently available with PC-1D’s standard user interface. 相似文献
26.
Abdullah Zeid Ayssa 《Renewable Energy》1996,8(1-4)
The traditional Yemeni window is considered to be one of the most important elements that characterize the yemeni architecture. The beauty of the traditional Yemeni window comes from its four main components which combined the functions of view, lighting, ventilation, protection, and privacy. These functions can be controlled by the occupants according to their social and environmental needs. The four main components are the lower part (Taqah), the fanlight (Qamariyah), the wooden external overhang (Konnah), and the small vent (Shaquos). Since fanlights provide natural lighting during day-time, the area of the lower part can be reduced and its exterior shutters can be closed without the need for artificial lighting. The internal natural lighting that is provided by the upper and lower parts of the window was investigated to see its quality. In this investigation, there were two main goals. The first is the contribution and quality of the internal light provided by the Qamariyah when shutters are closed. The second is the effect of the internal simple white cloth curtains, in the lower part, in the internal light quality. Visual measurements were taken in a typical room of a traditional house of the Old City of Sana'a, Yemen. From the findings, it was found that the fanlights (Qamariyat) provide low and soft homogeneous internal lighting which was as low as 22 lux average. However, the occupants have the ability to increase level of lighting to as high as 600 or 700 lux. This can be done simply by deciding which shutter to open and how many of them to be opened. In this paper, the methodology and findings will be presented and discussed. 相似文献
27.
超越离合器内星轮对数螺旋楔合面的设计 总被引:1,自引:0,他引:1
何为 《苏州大学学报(工科版)》2002,22(5):38-42
通过对采用平面楔合面内星轮的超越离合器的受力及磨损对其使用可靠性影响的分析,从而提出了用对数螺旋楔合而代替平面楔合面的设计方案,并对两种方案进行了比较。 相似文献
28.
20世纪后半叶是法国大学内部管理结构由雏形到成形的时期。在此过程中形成了一套完整的大学内部管理结构体系,不过,这一结构体系也存在一些问题。作为法国最大的综合性大学,巴黎大学内部管理结构上的问题透视出法国大学内部管理结构中的不足。本论文尝试着以巴黎大学为个案,分析20世纪后半叶法国大学在内部管理结构中的问题,尤其是高校内部两大团体之间的权力消长关系,以期对我国大学内部管理结构建设有所启示。 相似文献
29.
Computer models of the lubrication of piston-rings in internal combustion engines normally present an estimate of the minimum oil-film thickness between ring and cylinder wall as a function of crank angle. As a consequence, experimental measurements of film thickness play a critical role in the verification of theoretical models of piston-ring lubrication. A review is presented of the wide range of techniques that have been used to measure this important variable. The strengths and weaknesses of particular techniques are identified and a number of ways in which the techniques could be developed further are proposed 相似文献
30.
针对目前大多数科研单位在内部会计控制中存在的问题,根据财政部颁布的《内部会计控制规范一基本规范》,探讨了科研单位在转制过程中应如何建立和完善内部会计控制制度,以达到防范经营风险,保护资产安全、完整,确保经营管理目标和政策有效实施. 相似文献