全文获取类型
收费全文 | 1808篇 |
免费 | 204篇 |
国内免费 | 6篇 |
专业分类
电工技术 | 37篇 |
综合类 | 11篇 |
化学工业 | 455篇 |
金属工艺 | 55篇 |
机械仪表 | 31篇 |
建筑科学 | 151篇 |
矿业工程 | 2篇 |
能源动力 | 51篇 |
轻工业 | 66篇 |
水利工程 | 6篇 |
无线电 | 188篇 |
一般工业技术 | 412篇 |
冶金工业 | 100篇 |
原子能技术 | 9篇 |
自动化技术 | 444篇 |
出版年
2024年 | 4篇 |
2023年 | 50篇 |
2022年 | 53篇 |
2021年 | 98篇 |
2020年 | 86篇 |
2019年 | 79篇 |
2018年 | 85篇 |
2017年 | 70篇 |
2016年 | 99篇 |
2015年 | 98篇 |
2014年 | 115篇 |
2013年 | 132篇 |
2012年 | 145篇 |
2011年 | 160篇 |
2010年 | 134篇 |
2009年 | 93篇 |
2008年 | 98篇 |
2007年 | 88篇 |
2006年 | 75篇 |
2005年 | 50篇 |
2004年 | 29篇 |
2003年 | 14篇 |
2002年 | 19篇 |
2001年 | 15篇 |
2000年 | 8篇 |
1999年 | 12篇 |
1998年 | 23篇 |
1997年 | 15篇 |
1996年 | 9篇 |
1995年 | 7篇 |
1994年 | 7篇 |
1993年 | 3篇 |
1991年 | 4篇 |
1987年 | 1篇 |
1986年 | 5篇 |
1985年 | 2篇 |
1983年 | 2篇 |
1982年 | 1篇 |
1981年 | 4篇 |
1980年 | 3篇 |
1979年 | 2篇 |
1978年 | 2篇 |
1977年 | 2篇 |
1976年 | 6篇 |
1975年 | 4篇 |
1974年 | 1篇 |
1973年 | 1篇 |
1968年 | 1篇 |
1966年 | 1篇 |
1960年 | 1篇 |
排序方式: 共有2018条查询结果,搜索用时 31 毫秒
241.
Jing Huang Nairveen Ali Elsie Quansah Shuxia Guo Michel Noutsias Tobias Meyer-Zedler Thomas Bocklitz Jürgen Popp Ute Neugebauer Anuradha Ramoji 《International journal of molecular sciences》2021,22(4)
In recent decades, vibrational spectroscopic methods such as Raman and FT-IR spectroscopy are widely applied to investigate plasma and serum samples. These methods are combined with drop coating deposition techniques to pre-concentrate the biomolecules in the dried droplet to improve the detected vibrational signal. However, most often encountered challenge is the inhomogeneous redistribution of biomolecules due to the coffee-ring effect. In this study, the variation in biomolecule distribution within the dried-sample droplet has been investigated using Raman and FT-IR spectroscopy and fluorescence lifetime imaging method. The plasma-sample from healthy donors were investigated to show the spectral differences between the inner and outer-ring region of the dried-sample droplet. Further, the preferred location of deposition of the most abundant protein albumin in the blood during the drying process of the plasma has been illustrated by using deuterated albumin. Subsequently, two patients with different cardiac-related diseases were investigated exemplarily to illustrate the variation in the pattern of plasma and serum biomolecule distribution during the drying process and its impact on patient-stratification. The study shows that a uniform sampling position of the droplet, both at the inner and the outer ring, is necessary for thorough clinical characterization of the patient’s plasma and serum sample using vibrational spectroscopy. 相似文献
242.
Nonspherical drops are of interest in the formation of microcapsules in life sciences like food, pharmacy, and cosmetics, agro and fine chemicals as well as material sciences. Out of many systems, particle‐stabilized emulsion drops, so‐called Pickering emulsions, exhibit an interesting formulation. Systems with Pickering particles applied in an excess amount were investigated. During deformation, the particles fully covered the enlarged drop interfaces and prevented its relaxation to a spherical drop shape. Nonspherical drops could be produced in simple shear flow using an adequate process routine. The production in a simple device is a promising high‐throughput alternative to microfluidic devices. 相似文献
243.
Tobias E. Schmitzhaus Maria R. Ortega Vega Roberto Schroeder Iduvirges L. Muller Silvana Mattedi Célia de Fraga Malfatti 《工业材料与腐蚀》2020,71(11):1885-1902
The aim of the present study is to evaluate the performance of N-methyl-2-hydroxyethylammonium oleate ([m-2HEA][Ol]) as a corrosion inhibitor for mild steel in a 0.1-mol/L hydrochloric acid solution and also investigate the role of chloride in the inhibition mechanism. This protic ionic liquid (PIL) has formerly shown a high efficiency as a corrosion inhibitor in a neutral chloride medium. Electrochemical and weight loss measurements, surface contact angle determination, scanning electron microscopy, and Raman spectroscopy were used to understand the factors that influence the response of the studied inhibitor. Results revealed that [m-2HEA][Ol] behaves as a mixed-type adsorption inhibitor, by blocking cathodic sites and by modifying the activation energy of the anodic reaction, and it can reach up to 94–97% of inhibition efficiency. PIL adsorption was enhanced by the excess of positive charge of the mild steel. The effect of inhibitor molecule has been discussed to propose a mechanism that explains the inhibitory action of the corrosion inhibitor, pointing out the role of chloride in the inhibition mechanism. 相似文献
244.
245.
Anna Sib Tobias M. Milzarek Alexander Herrmann Dr. Lila Oubraham Jonas I. Müller Prof. Dr. Andreas Pichlmair Prof. Dr. Ruth Brack-Werner Prof. Dr. Tobias A. M. Gulder 《Chembiochem : a European journal of chemical biology》2020,21(4):492-495
Sorbicillinoids are fungal polyketides characterized by highly complex and diverse molecular structures, with considerable stereochemical intricacy combined with a high degree of oxygenation. Many sorbicillinoids possess promising biological activities. An interesting member of this natural product family is sorbicatechol A, which is reported to have antiviral activity, particularly against influenza A virus (H1N1). Through a straightforward, one-pot chemoenzymatic approach with recently developed oxidoreductase SorbC, the characteristic bicyclo[2.2.2]octane core of sorbicatechol is structurally diversified by variation of its natural 2-methoxyphenol substituent. This facilitates the preparation of a focused library of structural analogues bearing substituted aromatic systems, alkanes, heterocycles, and ethers. Fast access to this structural diversity provides an opportunity to explore the antiviral potential of the sorbicatechol family. 相似文献
246.
247.
248.
Combining Acoustic Emission and Vibration Technologies Harbors Huge Potential for Material Characterization
下载免费PDF全文
![点击此处可从《化学工程与技术》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Karl Nienhaus Hermann Wotruba Domenic Boos Simon Klösges Tobias Vraetz Kilian Neubert 《化学工程与技术》2015,38(12):2253-2260
The demand for raw materials is growing worldwide, in step with increasing world population and rising living standards of emerging countries. It is becoming more difficult to exploit primary raw materials because of declining ore grades and increasingly complicated mineralogies. Thus, the efficient and environmentally sustainable exploitation of primary resources using innovative technologies has emerged as an important research field to address these issues. An innovative approach is introduced to optimize process and quality control by combining acoustic emission (AE) and vibration technology. The general feasibility of these two technologies for material recognition and characterization is examined. The new approach was tested to determine whether coal could be distinguished from waste rock. 相似文献
249.
Mayer Sebastian Classen Tobias Endisch Christian 《Journal of Intelligent Manufacturing》2021,32(8):2335-2351
Journal of Intelligent Manufacturing - EU regulations on $$\textit{CO}_2$$ limits and the trend of individualization are pushing the automotive industry towards greater flexibility and robustness... 相似文献
250.
The processing of manganese nodules for the production of raw materials has been a subject of research for many decades. The nodules contain many valuable metals like copper, cobalt and nickel. In recent years, the German Federal Institute for Geoscience and Natural Resources developed a process for the processing of manganese nodules based on a combined pyro- and a hydrometallurgical route. Clausthal University of Technology was assigned to develop the hydrometallurgical process for the treatment of a FeNiCuCo alloy. The developed process consists of pressurized sulfuric acid leaching with the suppression of hydrogen gas formation, precipitation and solvent extraction. 相似文献