全文获取类型
收费全文 | 118篇 |
免费 | 2篇 |
专业分类
电工技术 | 2篇 |
综合类 | 3篇 |
化学工业 | 27篇 |
金属工艺 | 3篇 |
机械仪表 | 1篇 |
建筑科学 | 5篇 |
能源动力 | 18篇 |
轻工业 | 4篇 |
水利工程 | 1篇 |
无线电 | 14篇 |
一般工业技术 | 22篇 |
冶金工业 | 4篇 |
自动化技术 | 16篇 |
出版年
2023年 | 2篇 |
2022年 | 5篇 |
2021年 | 2篇 |
2020年 | 7篇 |
2019年 | 6篇 |
2018年 | 7篇 |
2017年 | 8篇 |
2016年 | 5篇 |
2015年 | 2篇 |
2014年 | 1篇 |
2013年 | 11篇 |
2012年 | 9篇 |
2011年 | 9篇 |
2010年 | 5篇 |
2009年 | 5篇 |
2008年 | 5篇 |
2007年 | 4篇 |
2006年 | 4篇 |
2005年 | 3篇 |
2004年 | 4篇 |
2003年 | 2篇 |
2002年 | 1篇 |
2001年 | 1篇 |
2000年 | 1篇 |
1999年 | 1篇 |
1998年 | 3篇 |
1997年 | 1篇 |
1995年 | 3篇 |
1992年 | 1篇 |
1981年 | 2篇 |
排序方式: 共有120条查询结果,搜索用时 10 毫秒
1.
Graphite electrodes were prepared by mixing calcined coke and coal tar pitch. They were pressed under 250 kg cm–2 and heat treated up to 2800° C. Rectangles measuring 70 mm x 40 mm x 8 mm were anodically polarized under galvanostatic and potentiostatic conditions. Electrolyses were conducted at 10–50 mA cm–2 for periods ranging from 10–120 hours in Na2SO4 solutions acidified with sulphuric acid to various pH values. The wear of graphite anodes increased with decreasing bath temperature, increasing acid concentration, decreasing pH of the electrolyte and increasing current density. A model is suggested which assumes that corrosion takes place via the formation of a lamellar crystal compound with the formula (C
8
0
O)(OH)3HSO
4
–
·2H2SO4.The compound is unstable at higher temperatures when corrosion is effected by oxidation of graphite by atomic oxygen. The formation of the carbon ions was found to be a necessary precondition for the formation of the complex. 相似文献
2.
The particular sorption by a swelling polymer with the transfer of hydrocarbons was studied in order to evaluate some barrier properties of this material. The transfer of two types of solvents through two varieties of ethylene vinyl acetate was investigated: absorption of pure toluene and pure n‐hexane and absorption of a toluene/hexane mixture in various compositions. A comparison between the two processes showed that these transfers were very different and depended on two factors: vinyl acetate content and composition of the mixture. The kinetics of absorption were calculated for various compositions. The profiles of concentration as well as the kinetics of swelling were evaluated using a numerical model deduced from the general theory of radial diffusion of a substance with change in dimensions. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 103: 2099–2106, 2007 相似文献
3.
Benmohamed Mohamed Galai Haykel Alouani Rabah Bejaoui Marouene Ben Haj Amara Abdessalem Ben Rhaim Hafsia 《武汉理工大学学报(材料科学英文版)》2017,32(6):1250-1260
Impurities from the raw materials, the grinding and the homogenization of the raw materials, the kiln instability and the complexity of the cooling step, all these factors make it difficult to obtain a perfect evaluation of the mineralogical composition of Portland clinker. We studied the limitations of the most commonly used quantitative methods and recommend some procedures to obtain reliable and reproducible results of quantitative analyses. Different clinker samples (provided by the Bizerte Cement Company (Tunisia)) were subjected to an elemental analysis by X-ray fluorescence and the mineralogical composition was determined by the Bogue calculation and by X-ray powder diffraction combined with the Rietveld method (Different softwares were used: XPert High Score Plus version 2.0 and TOPAS version 4.2). We then compared the results obtained by the Rietveld method and the Bogue calculation to the specific peak areas of each phase. The content of each phase, determined by the Rietveld method, varied proportionally to the change in peak area; a significant difference in these results was found by using the elementary Bogue calculation. 相似文献
4.
Jian-Qing Lu Rabah Boukherroub Georges Manuel William P. Weber 《Journal of Inorganic and Organometallic Polymers》1995,5(1):61-74
Poly[1-methyl-1-[3-(3-pyridinyl)propyl]-1-sila-cis-pent-3-ene], poly[1-phenyl-1-[3-(3-pyridinyl)propyl)-1-sila-cis-pent-3-ene], and poly[1-phenyl-1-(4-pyridinyl)-1-sila-cis-pent-3-ene] were synthesized by the anionic ring-opening polymerization of 1-methyl-1-[3-(3-pyridinyl)propyl]-1-silacyclopent-3-ene, 1-phenyl-1-[3-(3-pyridinyl)propyl]-1-silacyclopent-3-ene, and 1-phenyl-1-(4-pyridinyl)-1-silacyclopent-3-ene, respectively. These are the first polycarbosilanes which contain heterocyclic pyridine units as side-chain substituents. These polymers were characterized by1H,13C, and29Si NMR as well as by IR and UV spectroscopy. The molecular weight distributions were determined by gel permeation chromatography, glass transition temperatures, by differential seanning calorimetry: (DSC) and thermal behavior, by thermogravimetric analysis. (TGA). 相似文献
5.
6.
7.
Maha Ayat Samia Belhousse Luca Boarino Noureddine Gabouze Rabah Boukherroub Mohamed Kechouane 《Nanoscale research letters》2014,9(1):482
In this work, we report the fabrication of ordered silicon structures by chemical etching of silicon in vanadium oxide (V2O5)/hydrofluoric acid (HF) solution. The effects of the different etching parameters including the solution concentration, temperature, and the presence of metal catalyst film deposition (Pd) on the morphologies and reflective properties of the etched Si surfaces were studied. Scanning electron microscopy (SEM) was carried out to explore the morphologies of the etched surfaces with and without the presence of catalyst. In this case, the attack on the surfaces with a palladium deposit begins by creating uniform circular pores on silicon in which we distinguish the formation of pyramidal structures of silicon. Fourier transform infrared spectroscopy (FTIR) demonstrates that the surfaces are H-terminated. A UV-Vis-NIR spectrophotometer was used to study the reflectance of the structures obtained. A reflectance of 2.21% from the etched Si surfaces in the wavelength range of 400 to 1,000 nm was obtained after 120 min of etching while it is of 4.33% from the Pd/Si surfaces etched for 15 min. 相似文献
8.
Magalie De Ville Philippe Coquet Philippe Brunet Rabah Boukherroub 《Microfluidics and nanofluidics》2012,12(6):953-961
Convenient for both biologists and MEMS designers, Polydimethylsiloxane (PDMS) polymer is intensively investigated for its
biocompatibility, transparency, high resistance under plasma treatment, flexibility and resistance to high temperature. However,
for microfluidic applications, the fabrication of PDMS circular channels is difficult to achieve except by wire moulding.
In this article, we present a simple, fast and low-cost fabrication method which can be applied out of clean-room environment.
It is based on the deposition of alginic acid sodium salt aqueous solution, enabling the formation of a liquid cylinder on
the most hydrophilic part of a hydrophilic/hydrophobic patterned surface. We experimentally studied the interaction between
liquid rivulets and surfaces presenting a contrast of wettability and/or a stepwise texture. Subsequent moulding of the half-cylinder
of liquid produces round PDMS microfluidic channels. The optimal parameters for hydrophilic/hydrophobic patterns have then
been applied to produce the roundest possible channels. The realisation of both straight channels 300–500 μm wide, 1 cm long
and 75° tangent chord angle at best, and Y-shaped channels with the same dimensions and 55° TCA is demonstrated. 相似文献
9.
Philippe Allongue Catherine Henry de Villeneuve Sylvie Morin Rabah Boukherroub Danial D. M. Wayner 《Electrochimica acta》2000,45(28):4591
The reasons why ideally flat H–Si(111) surface can be prepared by NH4F etching are investigated from correlation between AFM observations and experimental conditions used for etching. It is shown that pitting may be completely suppressed if a one side polished wafer is immersed in an oxygen free solution. An analytical electrochemical study of the (111) and rough face of the same n-Si wafer is presented to yield insight into observations. 相似文献
10.
Galyna Shul Paolo Actis Bernadette Marcus Marcin Opallo Rabah Boukherroub Sabine Szunerits 《Diamond and Related Materials》2008,17(7-10):1394-1398
This paper reports on green chemical functionalization of hydrogen-terminated boron-doped diamond (BDD) surfaces with aryldiazonium salts in the presence of ionic liquids. The reaction takes place at room temperature in air without any external bias in either hydrophobic (1-butyl-3-methylimidazolium hexafluorophosphate) or hydrophilic (1-butyl-3-methylimidazolium methyl sulfate) ionic liquids. The resulting surfaces were characterized using X-ray photoelectron spectroscopy and electrochemical measurements. 相似文献