全文获取类型
收费全文 | 955篇 |
免费 | 113篇 |
国内免费 | 54篇 |
专业分类
电工技术 | 58篇 |
综合类 | 65篇 |
化学工业 | 168篇 |
金属工艺 | 36篇 |
机械仪表 | 72篇 |
建筑科学 | 137篇 |
矿业工程 | 54篇 |
能源动力 | 44篇 |
轻工业 | 54篇 |
水利工程 | 28篇 |
石油天然气 | 75篇 |
武器工业 | 11篇 |
无线电 | 68篇 |
一般工业技术 | 90篇 |
冶金工业 | 36篇 |
原子能技术 | 27篇 |
自动化技术 | 99篇 |
出版年
2024年 | 10篇 |
2023年 | 24篇 |
2022年 | 51篇 |
2021年 | 74篇 |
2020年 | 40篇 |
2019年 | 41篇 |
2018年 | 37篇 |
2017年 | 36篇 |
2016年 | 32篇 |
2015年 | 54篇 |
2014年 | 46篇 |
2013年 | 54篇 |
2012年 | 75篇 |
2011年 | 86篇 |
2010年 | 66篇 |
2009年 | 64篇 |
2008年 | 30篇 |
2007年 | 44篇 |
2006年 | 46篇 |
2005年 | 27篇 |
2004年 | 21篇 |
2003年 | 14篇 |
2002年 | 24篇 |
2001年 | 18篇 |
2000年 | 16篇 |
1999年 | 16篇 |
1998年 | 16篇 |
1997年 | 8篇 |
1996年 | 11篇 |
1995年 | 11篇 |
1994年 | 6篇 |
1993年 | 6篇 |
1992年 | 6篇 |
1990年 | 4篇 |
1989年 | 2篇 |
1987年 | 2篇 |
1982年 | 1篇 |
1981年 | 1篇 |
1959年 | 2篇 |
排序方式: 共有1122条查询结果,搜索用时 15 毫秒
1.
为了准确、快速地进行缺陷识别,介绍了一种新型的前馈神经网络模型,即径向基概率神经网络。与以往的算法相比,该方法具有分类识别精度高且速度快的优点。仿真获得了很好的结果。 相似文献
2.
钨铜合金药型罩及其性能 总被引:3,自引:0,他引:3
钨铜合金药型罩的应用可以提高射流对均质钢靶的侵彻能力.这一提高得益于射流密度的提高以及断裂时间的延长. 本文对钨铜合金射流及其断裂形态通过X光照像进行了研究.它的旋转效应及其炸高特性也进行了实验研究. 钨铜合金药型罩的威力实验在φ30 mm的破甲弹上进行.在相同装药条件下与紫铜罩相比,威力提高20~30%. 相似文献
3.
Jianlong Zou Xikui Ma Chi K. Tse Dong Dai 《International Journal of Circuit Theory and Applications》2006,34(3):251-264
In this paper, we derive the discrete‐time model for the power‐factor‐correction (PFC) buck‐boost converter in terms of a stroboscopic switching map. Fast‐scale instability is analysed through a fold diagram, which exposes the periodicity of the operation as well as the locations of the critical phase angles of the line voltage at which instability begins to occur along a half‐line cycle. The asymmetrical locations of the critical phase angles along a half‐line cycle is explained in terms of ‘under‐developed’ bifurcation. Border collision bifurcations are observed and analysed in detail. Copyright © 2006 John Wiley & Sons, Ltd. 相似文献
4.
5.
研究了二氧化碳与己二胺甲氧羰基化反应合成六亚甲基二异氰酸酯,考察了有机碱用量、反应温度、反应时间和压力等操作条件对反应的影响。结果表明最佳工艺条件:n(三乙胺):n(己二胺)=3:1,反应温度-5℃、反应时间60min、压力为0.55MPa。并用红外谱图和折光率对合成产物进行表征。 相似文献
6.
7.
8.
Pengbao Lian Qiang Liu Lizhen Chen Cai Cao Jiaxiang Zhao Jianlong Wang 《中国化学工程学报》1982,28(10):2634-2639
In this paper, the solubility of 4-nitroimidazole in twelve pure solvents (toluene, benzene, 1,4-dioxane, acetonitrile, ethyl acetate, acetone, GBL, ethanol, methanol, n-butanol, DMF and NMP) were determined by using the laser monitoring system from 278.15 K to 323.15 K under 101.1 kPa, which are 0.00018-0.00070, 0.00021-0.00073, 0.00034-0.00092, 0.00038-0.00142, 0.00047-0.00120, 0.00126-0.00303, 0.00225-0.00517, 0.00310-0.00724, 0.00467-0.00982, 0.00453-0.01940, 0.01947-0.04652, and 0.04670-0.07452, respectively. At constant temperature, the mole fraction solubility of 4-nitroimidazole were increased as the following order: toluene < benzene < 1,4-dioxane < (ethyl acetate or acetonitrile) < acetone < GBL < ethanol < (methanol or nbutanol) < DMF < NMP, and the solubility of 4-nitroimidazole in (ethyl acetate, acetonitrile) and (methanol, n-butanol) had an intersection point at 297.55 K and 281.85 K, respectively. The solubility of 4-nitroimidazole could be increased with increasing temperature in twelve pure solvents. The ideal model, modified Apelblat equation, polynomial empirical equation, and λh equation were used to correlate the experimental values. The experimental solubility values were employed to calculate the standard dissolution enthalpy, standard dissolution entropy and Gibbs energy. The dissolution of 4-nitroimidazole could be an endothermic process in twelve pure solvents. The determination and fitting solubility of 4-nitroimidazole have important guiding significance for the purification and crystallization of its preparation process. 相似文献
9.
10.
Qiang?Chen Gang?LiEmail author Yuan?Nie Shuhuai?Yao Jianlong?ZhaoEmail author 《Microfluidics and nanofluidics》2014,16(1-2):83-90
Reversibly assembled microfluidic devices are dismountable and reusable, which is useful for a number of applications such as micro- and nano-device fabrication, surface functionalization, complex cell patterning, and other biological analysis by means of spatial–temporal pattern. However, reversible microfluidic devices fabricated with current standard procedures can only be used for low-pressure applications. Assembling technology based on glass–PDMS–glass sandwich configuration provides an alternative sealing method for reversible microfluidic devices, which can drastically increase the sealing strength of reversibly adhered devices. The improvement mechanism of sealing properties of microfluidic devices based on the sandwich technique has not been fully characterized, hindering further improvement and broad use of this technique. Here, we characterize, for the first time, the effect of various parameters on the sealing strength of reversible PDMS/glass hybrid microfluidic devices, including contact area, PDMS thickness, assembling mode, and external force. To further improve the reversible sealing of glass–PDMS–glass microfluidic devices, we propose a new scheme which exploits mechanical clamping elements to reinforce the sealing strength of glass–PDMS–glass sandwich structures. Using our scheme, the glass–PDMS–glass microchips can survive a pressure up to 400 kPa, which is comparable to the irreversibly bonded PDMS microdevices. We believe that this bonding method may find use in lab-on-a-chip devices, particularly in active high-pressure-driven microfluidic devices. 相似文献