全文获取类型
收费全文 | 25148篇 |
免费 | 2052篇 |
国内免费 | 1096篇 |
专业分类
电工技术 | 1355篇 |
技术理论 | 3篇 |
综合类 | 1543篇 |
化学工业 | 4476篇 |
金属工艺 | 1432篇 |
机械仪表 | 1611篇 |
建筑科学 | 1836篇 |
矿业工程 | 961篇 |
能源动力 | 810篇 |
轻工业 | 1787篇 |
水利工程 | 493篇 |
石油天然气 | 1591篇 |
武器工业 | 161篇 |
无线电 | 2613篇 |
一般工业技术 | 3155篇 |
冶金工业 | 1397篇 |
原子能技术 | 244篇 |
自动化技术 | 2828篇 |
出版年
2024年 | 114篇 |
2023年 | 465篇 |
2022年 | 741篇 |
2021年 | 1072篇 |
2020年 | 814篇 |
2019年 | 701篇 |
2018年 | 813篇 |
2017年 | 877篇 |
2016年 | 794篇 |
2015年 | 996篇 |
2014年 | 1276篇 |
2013年 | 1559篇 |
2012年 | 1600篇 |
2011年 | 1696篇 |
2010年 | 1520篇 |
2009年 | 1360篇 |
2008年 | 1384篇 |
2007年 | 1291篇 |
2006年 | 1247篇 |
2005年 | 1107篇 |
2004年 | 784篇 |
2003年 | 714篇 |
2002年 | 726篇 |
2001年 | 603篇 |
2000年 | 560篇 |
1999年 | 620篇 |
1998年 | 498篇 |
1997年 | 417篇 |
1996年 | 376篇 |
1995年 | 322篇 |
1994年 | 300篇 |
1993年 | 226篇 |
1992年 | 171篇 |
1991年 | 118篇 |
1990年 | 65篇 |
1989年 | 68篇 |
1988年 | 75篇 |
1987年 | 47篇 |
1986年 | 34篇 |
1985年 | 22篇 |
1984年 | 15篇 |
1983年 | 10篇 |
1982年 | 15篇 |
1981年 | 10篇 |
1980年 | 8篇 |
1979年 | 11篇 |
1977年 | 5篇 |
1975年 | 5篇 |
1954年 | 4篇 |
1947年 | 5篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
51.
皮革去污上光用乳化蜡的研制 总被引:8,自引:0,他引:8
采用石蜡、微晶蜡为主要原料 ,经实验选出了以水为稀释剂的乳化型皮革去污上光蜡。实验优化的配方为石蜡 12 .5 g ,微晶蜡 8.0 g ,硬脂酸 8.5g ,三乙醇胺 5 .5 g ,水量 70 (涂用 )或 130 g(喷用 )。反应条件为乳化时间 4 0min ,搅拌速度 5 0 0~ 70 0r/min ,乳化温度 90℃。制得上光剂产品的去污性能可与用去污剂单独处理的效果相当 ,亮度可达 6 6 .7。 相似文献
52.
电容检测纱线传感器转换特性对纱线不匀率测试的影响 总被引:2,自引:1,他引:1
讨论了纱线测试中受电容检测纱线传感器转换特性的非线性影响,测得的条干不匀率值与纱线的实际条干不匀率值之间的差异,从理论上估计了纱线在不同的电容检测槽内测试时,由于其截面充满系数不同而引起的相对差异,并用试验数据加以验证。 相似文献
53.
Jau-Jiun Chen Soohwan Jang F. Ren Yuanjie Li Hyun-Sik Kim D. P. Norton S. J. Pearton A. Osinsky S. N. G. Chu J. F. Weaver 《Journal of Electronic Materials》2006,35(4):516-519
Wet etch rates at 25°C for Zn0.9Mg0.1O grown on sapphire substrates by pulsed laser deposition (PLD) were in the range 300–1100 nm · min−1 with HCl/H2O (5×10−3−2×10−2 M) and 120–300 nm · min−1 with H3PO4/H2O (5×10−3−2×10−2 M). Both of these dilute mixtures exhibited diffusion-limited etching, with thermal activation energies of 2–3 kCal · mol−1. By sharp contrast, the etch rates for ZnO also grown on sapphire by PLD were much slower in similar solutions, with rates
of 1.2–50 nm · min−1 in HCl/H2O (0.01–1.2 M) and 12–54 nm · min−1 in H3PO4/H2O (0.02–0.15 M). The etching was reaction limited over the temperature range 25–75°C, with activation energies close to 6
kCal · mol−1. The resulting selectivity of Zn0.9Mg0.1O over ZnO can be a high as ∼400 with HCl and ∼30 with H3PO4. 相似文献
54.
Steam cracking for the production of light olefins, such as ethylene and propylene, is the single most energy-consuming process in the chemical industry. This paper reviews conventional steam cracking and innovative olefin technologies in terms of energy efficiency. It is found that the pyrolysis section of a naphtha steam cracker alone consumes approximately 65% of the total process energy and approximately 75% of the total exergy loss. A family portrait of olefin technologies by feedstocks is drawn to search for alternatives. An overview of state-of-the-art naphtha cracking technologies shows that approximately 20% savings on the current average process energy use are possible. Advanced naphtha cracking technologies in the pyrolysis section, such as advanced coil and furnace materials, could together lead to up to approximately 20% savings on the process energy use by state-of-the-art technologies. Improvements in the compression and separation sections could together lead to up to approximately 15% savings. Alternative processes, i.e. catalytic olefin technologies, can save up to approximately 20%. 相似文献
55.
昌马水库工程是甘肃省重点工程,在施工中对测量放线要求较高,为了提高放线精度及效率,在放线中引入可编程序的casio fk一4500P计算器配合,迅速处理放线数据,取得了可喜的效果。 相似文献
56.
Fabrication and characteristics of high-speed implant-confined index-guided lateral-current 850-nm vertical cavity surface-emitting lasers 总被引:2,自引:0,他引:2
Dang G.T. Mehandru R. Luo B. Ren F. Hobson W.S. Lopata J. Tayahi M. Chu S.N.G. Pearton S.J. Chang W. Shen H. 《Lightwave Technology, Journal of》2003,21(4):1020-1031
Process technology of high-speed implant-apertured index-guide lateral-current-injection top dielectric-mirror quantum-well 850-nm vertical cavity surface-emitting lasers (VCSELs) has been developed. Oxygen and helium implantation for aperture definition and extrinsic capacitance reduction, dielectric mirror formation, p- and n-ohmic contact formation, VCSEL resistance, and thermal analysis were investigated. Employing this technology, GaAs/AlGaAs-based 850-nm VCSELs with small signal modulation bandwidths up to 11.5 Gb/s and an eye diagram generated at 12 Gb/s by a pseudorandom bit sequence of 2/sup 31/-1 were achieved. The bit-error rates were below 10/sup -13/. The threshold current is as low as 0.8 mA for 7-/spl mu/m-diameter current apertures and typical slope efficiencies of 0.45-0.5 mA/mW were obtained. 相似文献
57.
58.
59.
60.
Shumin Zhai Jing Kong Xiangshi Ren 《International journal of human-computer studies》2004,61(6):823-856
Pointing tasks in human–computer interaction obey certain speed–accuracy tradeoff rules. In general, the more accurate the task to be accomplished, the longer it takes and vice versa. Fitts’ law models the speed–accuracy tradeoff effect in pointing as imposed by the task parameters, through Fitts’ index of difficulty (Id) based on the ratio of the nominal movement distance and the size of the target. Operating with different speed or accuracy biases, performers may utilize more or less area than the target specifies, introducing another subjective layer of speed–accuracy tradeoff relative to the task specification. A conventional approach to overcome the impact of the subjective layer of speed–accuracy tradeoff is to use the a posteriori “effective” pointing precision We in lieu of the nominal target width W. Such an approach has lacked a theoretical or empirical foundation. This study investigates the nature and the relationship of the two layers of speed–accuracy tradeoff by systematically controlling both Id and the index of target utilization Iu in a set of four experiments. Their results show that the impacts of the two layers of speed–accuracy tradeoff are not fundamentally equivalent. The use of We could indeed compensate for the difference in target utilization, but not completely. More logical Fitts’ law parameter estimates can be obtained by the We adjustment, although its use also lowers the correlation between pointing time and the index of difficulty. The study also shows the complex interaction effect between Id and Iu, suggesting that a simple and complete model accommodating both layers of speed–accuracy tradeoff may not exist. 相似文献