全文获取类型
收费全文 | 1511篇 |
免费 | 17篇 |
专业分类
电工技术 | 23篇 |
化学工业 | 297篇 |
金属工艺 | 76篇 |
机械仪表 | 88篇 |
建筑科学 | 16篇 |
矿业工程 | 33篇 |
能源动力 | 27篇 |
轻工业 | 13篇 |
水利工程 | 21篇 |
石油天然气 | 111篇 |
无线电 | 64篇 |
一般工业技术 | 255篇 |
冶金工业 | 424篇 |
原子能技术 | 55篇 |
自动化技术 | 25篇 |
出版年
2022年 | 20篇 |
2021年 | 40篇 |
2020年 | 12篇 |
2019年 | 14篇 |
2018年 | 35篇 |
2017年 | 51篇 |
2016年 | 38篇 |
2015年 | 30篇 |
2014年 | 31篇 |
2013年 | 42篇 |
2012年 | 47篇 |
2011年 | 43篇 |
2010年 | 41篇 |
2009年 | 42篇 |
2008年 | 44篇 |
2007年 | 40篇 |
2006年 | 21篇 |
2005年 | 22篇 |
2004年 | 23篇 |
2003年 | 26篇 |
2002年 | 24篇 |
2001年 | 20篇 |
2000年 | 29篇 |
1999年 | 18篇 |
1998年 | 97篇 |
1997年 | 80篇 |
1996年 | 51篇 |
1995年 | 53篇 |
1994年 | 34篇 |
1993年 | 32篇 |
1992年 | 22篇 |
1991年 | 22篇 |
1990年 | 19篇 |
1989年 | 13篇 |
1988年 | 11篇 |
1987年 | 21篇 |
1986年 | 12篇 |
1983年 | 10篇 |
1982年 | 14篇 |
1981年 | 16篇 |
1980年 | 16篇 |
1979年 | 16篇 |
1978年 | 19篇 |
1977年 | 20篇 |
1976年 | 34篇 |
1975年 | 21篇 |
1974年 | 17篇 |
1972年 | 19篇 |
1971年 | 16篇 |
1968年 | 13篇 |
排序方式: 共有1528条查询结果,搜索用时 0 毫秒
51.
52.
Lukin E. S. Makarov N. A. Pershikova E. M. Popova N. A. Kuteinikova A. L. Anufrieva E. V. Tarasova S. V. Kozlov A. I. Zhirnov R. V. Zonin A. V. 《Refractories and Industrial Ceramics》2004,45(2):65-68
A brief survey of four groups of ceramic materials with a potential for effective use in science and technology is given. Durable ceramics based on Al2O3 and ZrO2 are considered and areas of application are outlined. Corundum ceramics using eutectic additives that allow the sintering to be conducted at lower temperatures are discussed; structural features and properties of new materials and areas of application are considered. The use of porous ceramic materials for filtering cells and catalyst carriers is discussed. Bioceramics with a dense and porous structure based on hydroxyapatite that find ever-increasing interest for use in medicine are considered. 相似文献
53.
A method and application results are described for using mathematical models in statistical analysis and control of the annealing regime of a glass band transported inside a tunnel furnace. The results of a computational experiment estimating the efficiency of the algorithms of the annealing regime control are discussed. The possibility for reducing waste and improving the quality of polished glass annealing is demonstrated. 相似文献
54.
55.
56.
57.
Sílvia DAS Ramôa Guilherme MO Barra Ricardo VB Oliveira Márcia G de Oliveira Mateus Cossa Bluma G Soares 《Polymer International》2013,62(10):1477-1484
Electrically conducting rubbery composites based on thermoplastic polyurethane (TPU) and carbon nanotubes (CNTs) were prepared through melt blending using a torque rheometer equipped with a mixing chamber. The electrical conductivity, morphology, rheological properties and electromagnetic interference shielding effectiveness (EMI SE) of the TPU/CNT composites were evaluated and also compared with those of carbon black (CB)‐filled TPU composites prepared under the same processing conditions. For both polymer systems, the insulator–conductor transition was very sharp and the electrical percolation threshold at room temperature was at CNT and CB contents of about 1.0 and 1.7 wt%, respectively. The EMI SE over the X‐band frequency range (8–12 GHz) for TPU/CNT and TPU/CB composites was investigated as a function of filler content. EMI SE and electrical conductivity increased with increasing amount of conductive filler, due to the formation of conductive pathways in the TPU matrix. TPU/CNT composites displayed higher electrical conductivity and EMI SE than TPU/CB composites with similar conductive filler content. EMI SE values found for TPU/CNT and TPU/CB composites containing 10 and 15 wt% conductive fillers, respectively, were in the range ?22 to ?20 dB, indicating that these composites are promising candidates for shielding applications. © 2013 Society of Chemical Industry 相似文献
58.
Plasma-Assisted Diesel Oxidation Catalyst on Bench Scale: Focus on Light-off Temperature and NOx Behavior 总被引:1,自引:0,他引:1
A. Leray A. Guy M. Makarov K. Lombaert J. M. Cormier A. Khacef 《Topics in Catalysis》2013,56(1-8):222-226
The effect of a non-thermal plasma reactor over a commercial Diesel oxidation catalyst (DOC) was investigated. Studies have been focused on the gas treatment efficiency together with lowering light-off temperature when a DOC catalyst was connected downstream to plasma reactor in test bench scale. Experiments have been conducted using multi-DBDs (dielectric barrier discharge) reactor in planar configuration driven by a HV AC generator (11 kV–15 kHz). The specific input energy was set to 57 and 85 J/L. Experiments were performed in gas composition simulating Diesel exhaust. Commercial DOC, monolith-supported Pt–Pd/Al2O3, was used at gas hourly space velocities of about 55,000 and 82,000 h?1. CO and hydrocarbons light-off curves were determined for DOC, plasma, and plasma-DOC systems by temperature programmed surface reaction from 80 to 400 °C. Particular attention has been paid to the gas temperature between the plasma reactor and the DOC. Results show that the plasma-catalyst system provides the lowest light-off temperatures for CO and HCs. Under conditions of this study, light-off temperature improvement by about 57 °C was obtained and the plasma reactor totally oxidized NO to NO2 at low temperature. 相似文献
59.
The structure of a control system for a winding machine was examined. Microprocessor control of the winding process is based on the use of a system for coupled control of winding parameters. Deceased Moscow State Textile University. Translated fromKhimicheskie Volokna, No. 1, pp. 64–66, January–February, 2000. 相似文献
60.