全文获取类型
收费全文 | 5088篇 |
免费 | 301篇 |
国内免费 | 7篇 |
专业分类
电工技术 | 38篇 |
综合类 | 2篇 |
化学工业 | 1610篇 |
金属工艺 | 199篇 |
机械仪表 | 176篇 |
建筑科学 | 186篇 |
矿业工程 | 15篇 |
能源动力 | 328篇 |
轻工业 | 816篇 |
水利工程 | 28篇 |
石油天然气 | 27篇 |
无线电 | 149篇 |
一般工业技术 | 948篇 |
冶金工业 | 155篇 |
原子能技术 | 73篇 |
自动化技术 | 646篇 |
出版年
2024年 | 17篇 |
2023年 | 47篇 |
2022年 | 132篇 |
2021年 | 229篇 |
2020年 | 136篇 |
2019年 | 146篇 |
2018年 | 221篇 |
2017年 | 223篇 |
2016年 | 237篇 |
2015年 | 171篇 |
2014年 | 242篇 |
2013年 | 616篇 |
2012年 | 239篇 |
2011年 | 322篇 |
2010年 | 313篇 |
2009年 | 284篇 |
2008年 | 217篇 |
2007年 | 182篇 |
2006年 | 119篇 |
2005年 | 76篇 |
2004年 | 64篇 |
2003年 | 54篇 |
2002年 | 56篇 |
2001年 | 38篇 |
2000年 | 40篇 |
1999年 | 33篇 |
1998年 | 47篇 |
1997年 | 30篇 |
1996年 | 42篇 |
1995年 | 43篇 |
1994年 | 31篇 |
1993年 | 29篇 |
1992年 | 21篇 |
1987年 | 24篇 |
1986年 | 19篇 |
1985年 | 32篇 |
1984年 | 32篇 |
1983年 | 30篇 |
1982年 | 42篇 |
1981年 | 42篇 |
1980年 | 41篇 |
1979年 | 38篇 |
1978年 | 39篇 |
1977年 | 35篇 |
1976年 | 38篇 |
1975年 | 34篇 |
1974年 | 36篇 |
1973年 | 38篇 |
1971年 | 24篇 |
1968年 | 18篇 |
排序方式: 共有5396条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
5.
Volumetric mass transfer coefficients, kLa, just as power input are considered as essential parameters for mechanically agitated gas‐liquid contactors in relation to their optimization and design. The knowledge of power input is crucial for the prediction of other mass transfer characteristics. A power input correlation is created for the industrial design of the process with a non‐coalescent batch that would be appropriate for a broad range of operational conditions. The recommended resulting correlation is able to predict the power input for impellers in industrial‐scale design for a significant scope of operational conditions. 相似文献
6.
7.
8.
9.
A nonstationary model of SO2 absorption from a gas phase to a countercurrent falling film of absorbing slurry was developed. Laminar, wavy and turbulent film structures were considered based on published information. Resistances to the mass transfer on the gas and the liquid sides of the interphase were considered, together with chemical reactions in the liquid phase. Relevant chemical equilibria in the liquid phase were modeled. Original experimental data on the neutralization reagent dissolution rate presented as a polydispersed two‐phase system of solids and on the rate of dissolved sulfite oxidation were used. The model was verified with experimental data from a laboratory‐scale falling‐film absorber using a single vertical tube under various geometrical and operating conditions, and a very good agreement was found with the experiment. Parametric sensitivity analysis showed the critical parts of the model. 相似文献
10.
I. Budić-Leto T. Lovrić J. Gajdoš Kljusurić I. Pezo U. Vrhovšek 《European Food Research and Technology》2006,222(3-4):397-402
Identification of anthocyanins in the wine made of the Croatian autochthonous grape variety of Babić (Vitis vinifera L.) was carried out and their profile was determined by means of high-performance liquid chromatography with diode array
and mass spectrometric detection. Dependence of anthocyanins content and profile on maceration treatment conditions was investigated.
Statistically significant differences of anthocyanins concentration in wines Babić produced by various maceration treatments
were confirmed by the use of multivariate analysis of variances. The investigation results indicated that the maceration temperature
exerts higher influence on anthocyanins concentration than the duration of maceration. In addition, on the basis of anthocyanin
composition and using different multivariate statistical analyses, differentiation of wines Babić according to maceration
treatments was procured. 相似文献