全文获取类型
收费全文 | 3605篇 |
免费 | 122篇 |
国内免费 | 105篇 |
专业分类
电工技术 | 61篇 |
综合类 | 113篇 |
化学工业 | 498篇 |
金属工艺 | 449篇 |
机械仪表 | 248篇 |
建筑科学 | 195篇 |
矿业工程 | 258篇 |
能源动力 | 132篇 |
轻工业 | 101篇 |
水利工程 | 16篇 |
石油天然气 | 34篇 |
武器工业 | 11篇 |
无线电 | 222篇 |
一般工业技术 | 287篇 |
冶金工业 | 508篇 |
原子能技术 | 29篇 |
自动化技术 | 670篇 |
出版年
2024年 | 5篇 |
2023年 | 36篇 |
2022年 | 59篇 |
2021年 | 69篇 |
2020年 | 60篇 |
2019年 | 66篇 |
2018年 | 65篇 |
2017年 | 83篇 |
2016年 | 87篇 |
2015年 | 114篇 |
2014年 | 177篇 |
2013年 | 242篇 |
2012年 | 200篇 |
2011年 | 274篇 |
2010年 | 191篇 |
2009年 | 177篇 |
2008年 | 166篇 |
2007年 | 254篇 |
2006年 | 210篇 |
2005年 | 161篇 |
2004年 | 122篇 |
2003年 | 128篇 |
2002年 | 103篇 |
2001年 | 103篇 |
2000年 | 97篇 |
1999年 | 85篇 |
1998年 | 74篇 |
1997年 | 78篇 |
1996年 | 86篇 |
1995年 | 57篇 |
1994年 | 63篇 |
1993年 | 42篇 |
1992年 | 26篇 |
1991年 | 15篇 |
1990年 | 11篇 |
1989年 | 11篇 |
1988年 | 12篇 |
1987年 | 10篇 |
1986年 | 2篇 |
1985年 | 2篇 |
1984年 | 2篇 |
1983年 | 3篇 |
1982年 | 1篇 |
1980年 | 1篇 |
1978年 | 1篇 |
1977年 | 1篇 |
排序方式: 共有3832条查询结果,搜索用时 15 毫秒
1.
《International Journal of Hydrogen Energy》2022,47(84):35641-35654
The continuous catalytic regenerative (CCR) reforming process is one of the most significant sources of hydrogen production in the petroleum refining process. However, the fluctuations in feedstock composition and flow rate could significantly affect both product distribution and energy consumption. In this study, a robust deviation criterion based multi-objective optimization approach is proposed to perform the optimal operation of CCR reformer under feedstock uncertainty, with simultaneous maximization of product yields and minimization of energy consumption. Minimax approach is adopted to handle these uncertain objectives, and the Latin hypercube sampling method is then used to calculate these robust deviation criteria. Multi-objective surrogate-based optimization methods are next introduced to effectively solve the robust operational problem with high computational cost. The level diagram method is finally utilized to assist in multi-criteria decision-making. Two robust operational optimization problems with different objectives are solved to demonstrate the effectiveness of the proposed method for robust optimal operation of the CCR reforming process under feedstock uncertainty. 相似文献
2.
M. R. Thompson 《Drug development and industrial pharmacy》2015,41(8):1223-1231
Twin screw granulation (TSG) is a new process of interest to the pharmaceutical community that can continuously wet granulate powders, doing so at lower liquid concentrations and with better product consistency than found by a high shear batch mixer. A considerable body of research has evolved over the short time since this process was introduced but generally with little comparison of results. A certain degree of confidence has been developed through these studies related to how process variables and many attributes of machinery configuration will affect granulation but some major challenges still lay ahead related to scalability, variations in the processing regimes related to degree of channel fill and the impact of wetting and granulation of complex powder formulations. This review examines the current literature for wet granulation processes studied in twin screw extrusion machinery, summarizing the influences of operational and system parameters affecting granule properties as well as strives to provide some practical observations to newly interested users of the technique. 相似文献
3.
The effect of Li2O on the crystallization properties of CaO-Al2O3-SiO2-Li2O-Ce2O3 slags was investigated. With increasing the Li2O content, LiAlO2 and CaCeAlO4 were the main crystalline phases. LiAlO2 formed for the charge compensating of Li+ ions to [AlO45?]-tetrahedrons, and CaCeAlO4 formed as a result of the charge balance of Ce3+ ions, Ca2+ ions, and [AlO69?]-octahedrons. Increasing the content of Li2O to 10%, the crystallization temperature was the highest, and the incubation time was the shortest. The crystallization ability was strong due to the three factors of strengthening the interaction between ions and ion groups, decreasing the polymerization degree, and increasing the melting temperature. Further increasing the content of Li2O, the crystallization performance was obviously suppressed, because the melting temperature and the force between the cations and the anion groups decreased. 相似文献
4.
5.
托盘能否有效运用对物流的畅通与否关系重大,这已经引起了国内外专家和学者们的重视,并就此制定了托盘电子信息化管理系统,旨在更合理地使用托盘,推进托盘一体化和共用系统的建立。而RFID技术在托盘的电子信息化管理的应用更将大大提高物流的效率与准确性,托盘电子信息化管理将成为今后托盘管理的趋势。 相似文献
6.
简要介绍世界几种主要薄板坯连铸工艺。着重叙述应用大型通用商业软件MSC.MARC。模拟液芯压下时铸坯的变形,确定最佳压下方案的有限元分析,液芯压下应该在结晶器出口处及二冷区扇形段开始部分进行,这样能减小铸坯的应变。 相似文献
7.
在各糖厂现用连续离心机原有生产实践基础上,对其机械吸震、加温、布温、机索结构、物料密封、机座等部件做了进一步改进,并取得可观的实效。 相似文献
8.
9.
Andrew Davenport 《Hemodialysis international. International Symposium on Home Hemodialysis》2003,7(4):348-352
Continuous renal replacement therapy (CRRT) is becoming the treatment of choice for critically ill patients with acute renal failure around the world. In particular, CRRT is used for patients with combined liver and acute renal failure, because they are often hemodynamically unstable. The question arises as to whether the use of CRRT should be extended to those patients with acute and chronic liver failure who do not have dialysis-dependent renal failure. CRRT could potentially allow some detoxification by removing water-soluble toxins and also allow regulation of intravascular volume and correction of sodium and other electrolyte and acid–base imbalances. By providing homeostatic control, CCRT could potentially help support patients by bridging to liver transplantation and managing those who eventually recover with hepatic regeneration. 相似文献
10.
本文综述国外硬岩连续采矿技术的最新进展,包括:钻孔劈裂破岩、液压冲击式采矿、等离子爆破、自动钻爆和高压水射流破岩系统。 相似文献