全文获取类型
收费全文 | 12905篇 |
免费 | 1033篇 |
国内免费 | 462篇 |
专业分类
电工技术 | 205篇 |
综合类 | 737篇 |
化学工业 | 5390篇 |
金属工艺 | 640篇 |
机械仪表 | 350篇 |
建筑科学 | 375篇 |
矿业工程 | 741篇 |
能源动力 | 110篇 |
轻工业 | 1775篇 |
水利工程 | 67篇 |
石油天然气 | 586篇 |
武器工业 | 108篇 |
无线电 | 286篇 |
一般工业技术 | 1838篇 |
冶金工业 | 863篇 |
原子能技术 | 99篇 |
自动化技术 | 230篇 |
出版年
2024年 | 62篇 |
2023年 | 131篇 |
2022年 | 289篇 |
2021年 | 329篇 |
2020年 | 319篇 |
2019年 | 270篇 |
2018年 | 245篇 |
2017年 | 294篇 |
2016年 | 366篇 |
2015年 | 369篇 |
2014年 | 596篇 |
2013年 | 612篇 |
2012年 | 912篇 |
2011年 | 956篇 |
2010年 | 727篇 |
2009年 | 770篇 |
2008年 | 612篇 |
2007年 | 977篇 |
2006年 | 906篇 |
2005年 | 802篇 |
2004年 | 672篇 |
2003年 | 642篇 |
2002年 | 550篇 |
2001年 | 427篇 |
2000年 | 349篇 |
1999年 | 277篇 |
1998年 | 214篇 |
1997年 | 152篇 |
1996年 | 124篇 |
1995年 | 101篇 |
1994年 | 75篇 |
1993年 | 57篇 |
1992年 | 49篇 |
1991年 | 31篇 |
1990年 | 13篇 |
1989年 | 25篇 |
1988年 | 15篇 |
1987年 | 14篇 |
1986年 | 7篇 |
1985年 | 12篇 |
1984年 | 13篇 |
1983年 | 4篇 |
1982年 | 8篇 |
1981年 | 5篇 |
1980年 | 2篇 |
1979年 | 2篇 |
1975年 | 2篇 |
1965年 | 2篇 |
1962年 | 2篇 |
1951年 | 5篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
41.
P. Bocchetta C. Sunseri A. Bottino G. Capannelli G. Chiavarotti S. Piazza F. Di Quarto 《Journal of Applied Electrochemistry》2002,32(9):977-985
Alumina membranes were fabricated by anodizing aluminium metal in 0.15 M oxalic acid. The growth kinetics of the porous layer were investigated in the temperature range –1 to 16 °C using linear potential scans up to 70 V. The faradaic efficiencies of metal oxidation and of porous layer formation, determined by applying Faraday's law, were found to be independent of both temperature and electrical charge. SEM analysis of the metal-side and solution-side surfaces revealed different morphologies. After dissolution of the barrier layer in phosphoric acid, the metal-side surface showed circular pores whose size of about 90 nm was found to be uniform and independent of temperature. The pore population was also practically independent of temperature and a value of about 4 × 1013 pores m–2 was determined. On the solution-side surface the presence of a deposit partially occluding the mouths of pores was observed. This coating could be removed by chemical etching in NaOH or thermal treatment at 870 °C, where decomposition of oxalate occurs. This supports the hypothesis that the deposit consists of an aluminium salt containing oxalate anions precipitated from the solution. The results show that it is possible to control the morphological characteristics of the anodic alumina membranes by careful choice of experimental conditions. 相似文献
42.
超高纯铜的制备方法和应用 总被引:4,自引:0,他引:4
简要介绍了超高纯铜(UHPC)的几种精炼方法,以及它在工业方面的应用。并对超高纯铜的研究开发趋势及应用前景进行了展望。 相似文献
43.
44.
阳离子型聚丙烯酰胺絮凝剂的开发与应用 总被引:8,自引:0,他引:8
阳离子型聚丙烯酰胺具有许多优点,极具开发研究价值,是重要的高分子絮凝剂。介绍了阳离子型聚丙烯酰胺絮凝剂的制备方法,应用及其絮凝作用机理,并分析了其发展方向。 相似文献
45.
46.
Representative and quantitative microstructural information of cement-based materials can be obtained in the backscattered electron and X-ray modes of the scanning electron microscope (SEM). One prerequisite, of several, is to use flat specimens. Microstructures that are minimally affected by the grinding and polishing necessary to produce the flat surface can be obtained. It is essential to fill the pores of the specimen with epoxy resin prior to grinding and polishing. After hardening, the epoxy stabilizes the microstructure and enables it to withstand the stresses of grinding and polishing without alteration. In the present paper, we describe a preparation technique that we consider to have produced excellent polished specimens. The importance of epoxy impregnation is demonstrated. 相似文献
47.
Wei Yan Matthew Charles Pritchard Chun-Hsien Chen Li Pheng Khoo 《The International Journal of Advanced Manufacturing Technology》2006,29(5-6):616-628
Collaboration with other members of the supply chain is one means by which small and medium sized enterprises (SMEs) can compete
in today’s global business environment. Thus, early stages of the new product development process involve both technical activities,
e.g., product platform definition, and commercial activities, e.g., bidding for contracts. This paper introduces an integrated
collaborative bidding and design system (CBDS) to help SMEs coordinate the two aspects. General sorting was employed for initial
requirements acquisition and platform definition; while a self-organizing map (SOM) neural network was combined with a concurrent
cost-schedule estimation strategy for refinement of design options and bid evaluation/preparation. A case study on cellular
phone design was then applied for illustrating the proposed prototype system. 相似文献
48.
Makoto Kohga 《含能材料》2006,14(6):471-474
1 IntroductionThe ammonium perchlorate ( AP)-based compositepropellant is currently the most widely used one becausethis propellant has good burning characteristics and me-chanical properties. One of the few serious drawbacks ofthe AP-based propellant is that its products of combus-tion, which include HCl, chlorine, and chlorine oxides,cause atmospheric pollution. Increasing concern for aclean atmosphere in recent years has resulted in a com-pelling need for developing a chlorine-free,enviro… 相似文献
49.
Dental amalgams are based on a broad spectrum of materials differing in their chemical composition, metallurgical treatment, and in the way the initial alloys powders are prepared. In addition to their chemical composition, amalgams based on various powders differ in both their microstructure and the amount of mercury needed for preparation. All these facts may affect electrochemical processes occurring during their interaction with oral fluids, and also mercury release. While verifying the effect of the technology used for the preparation of the high‐copper ternary alloy powder on the properties of resulting amalgams, this study aimed at the mechanism of their interaction with a model saliva solution as well as mercury release was included. Measurements were done in a model saliva solution using standard electrochemical methods and exposition measurements. The interaction of individual types of amalgams with artificial saliva did not reveal any significant differences. The free corrosion potential of all these amalgams in an aerated solution settled in the range of values in which tin oxidation, resulting in a layer of insoluble corrosion producsts, turned out to be the dominant anodic process. The rate of mercury release was the lowest for amalgams based on a gas‐atomized alloy. The highest rate of mercury release, and also its dependence on time, was exhibited by lathe‐cut powder based amalgam. In addition to different volume fraction of the Ag‐Hg phase and the level of its tin alloying, this different behaviour may be explained by differences in the rate at which a layer of tin corrosion products acting as a barrier to mercury release is formed. 相似文献
50.
Specimen preparation and image processing and analysis techniques for automated quantification of concrete microcracks and voids 总被引:4,自引:0,他引:4
Parviz Soroushian Mohamed Elzafraney Ali Nossoni 《Cement and Concrete Research》2003,33(12):1949-1962
Specimen preparation and image processing/analysis techniques were developed for use in automated quantitative microstructural investigation of concrete, focusing on concrete microcracks and voids. Different specimen preparation techniques were developed for use in fluorescent and scanning electron microscopy (SEM) of concrete; then techniques produce a sharp contrast between microcracks/voids and the body of concrete. The image processing/analysis techniques developed specifically for use with concrete address the following usages: automatic threshold; development of intersecting microcracks/voids and connected voids; distinction of microcracks form voids based on geometric attributes; and noise filtration. 相似文献