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排序方式: 共有2711条查询结果,搜索用时 15 毫秒
1.
Fernando J Beltrn F Javier Rivas Olga Gimeno 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》2005,80(9):973-984
Photocatalytic ozonation (1O3 + VUV + TiO2), ozonation (O3), catalytic ozonation (O3 + TiO2), ozone photolysis (O3 + VUV), photocatalysis (TiO2 + VUV) and photolysis (VUV) have been compared in terms of formation of intermediates, extent of, mineralization (TOC, COD, chloride, nitrate) and kinetics in the aqueous treatment of three phenols (phenol, p‐chlorophenol and p‐nitrophenol). In all cases, photocatalytic ozonation led to lower degradation times for chemical oxygen demand and total organic carbon removal. Intermediates formed were similar in the different oxidation systems with some exceptions. They can be classified into three different types: polyphenols (resorcinol, catechol, hydroquinone), unsaturated carboxylic acids (maleic and fumaric acids) and saturated carboxylic acids (glyoxylic, formic and oxalic acids). First order kinetic equations have been checked for the oxidation processes studied in the case of the parent compound. Rate constants of these systems have also been calculated. Copyright © 2005 Society of Chemical Industry 相似文献
2.
3.
Studies on Catalytic Side-Chain Oxidation of Nitroaromatics to Aldehydes with Oxygen 总被引:2,自引:0,他引:2
The side-chain oxidation of 2-nitrotoluene in liquid phase in the presence of catalytic amount of manganese sulfate and stoichiometric amount of potassium hydroxide with oxygen was studied. In the most favorable conditions, over 80% of conversion of 2-nitrotoluene and 50% of selectivity to 2-nitrobenzaldehyde was achieved. Effects of the reaction parameters on the conversion of the reactant and the selectivity of the product were examined. These results, together with EPR spectroscopic study, show that a benzyl anion was formed in the early stage of the reaction, which was then converted to the final product via a free radical mechanism. 相似文献
4.
本文首先对CFCSS(控制流检错算法)进行了介绍,对GCC编译器的运行流程进行了简要分析,再次给出了在GCC编译器中扩充CFCSS算法的具体方法,最后通过故障注入实验对扩充后的GCC进行了有效性验证。实验表明,扩充了CFCSS算法的GCC编译器所编译的程序在运行过程中具有控制流检错能力。这为我们下一步的故障定位和故障恢复提供了有力的支持,为解决星载计算机的运行故障奠定了基础。 相似文献
5.
X. Q. Ma H. Zhang J. Dai J. Roth R. Hui T. D. Xiao D. E. Reisner 《Journal of Thermal Spray Technology》2005,14(1):61-66
This work addresses the fabrication of membrane-type solid oxide fuel cells (SOFCs) operating at medium temperatures, where
all components are fabricated by plasma spray technology, and the evaluation of the performance of the SOFC single unit in
a temperature range of 500 to 800 °C. Single cells composed of LaSrMgO3 cathodes, LaSrGaMgO3 (LSGM) electrolytes, and Ni/yttria-stabilized zirconia anodes were fabricated in successive atmospheric plasma-spraying processes.
Plasma-spraying processes have been optimized and tailored to each layer to achieve highly porous cathode and anode layers
as well as high-density electrolyte layers. A major effort has been devoted to the production of the LSGM electrolyte that
has a high density and is free of cracks. Electrochemical impedance spectroscopy was used to investigate the conductivity
of the electrode layers, and particularly the resistance of the electrolyte layer. It revealed that the heat treatment had
a great influence on the specific conductivity of the sprayed electrolyte layers and that the specific conductivity of the
heat-treated layers was dramatically increased to the same magnitude as is typical for sintered LSGM pellets. The experimental
results have demonstrated that the plasma-spraying process has a great potential for the integrated fabrication of medium-temperature
SOFC units.
The original version of this article was published as part of the ASM Proceedings, Thermal Spray 2003: Advancing the Science and Applying the Technology, International Thermal Spray Conference (Orlando, FL), May 5–8, 2003, Basil R. Marple and Christian Moreau, Ed., ASM International,
2003. 相似文献
6.
Luisa Siculella Laura Giannotti Benedetta Di Chiara Stanca Matteo Calcagnile Alessio Rochira Eleonora Stanca Pietro Alifano Fabrizio Damiano 《International journal of molecular sciences》2021,22(8)
Reactive intermediate deaminase (Rid) proteins are enzymes conserved in all domains of life. UK114, a mammalian member of RidA subfamily, has been firstly identified as a component of liver perchloric acid-soluble proteins (L-PSP). Although still poorly defined, several functions have been attributed to the mammalian protein UK114/RIDA, including the reactive intermediate deamination activity. The expression of UK114/RIDA has been observed in some tumors, arousing interest in this protein as an evaluable tumor marker. However, other studies reported a negative correlation between UK114/RIDA expression, tumor differentiation degree and cell proliferation. This work addressed the question of UK114/RIDA expression in human non-tumor HEK293 cell lines and in some human tumor cell lines. Here we reported that human RIDA (hRIDA) was expressed in all the analyzed cell line and subjected to lysine (K-)succinylation. In HEK293, hRIDA K-succinylation was negatively correlated to the cell proliferation rate and was under the control of SIRT5. Moreover, K-succinylation clearly altered hRIDA quantification by immunoblotting, explaining, at least in part, some discrepancies about RIDA expression reported in previous studies. We found that hRIDA was able to deaminate reactive enamine-imine intermediates and that K-succinylation drastically reduced deaminase activity. As predicted by in silico analysis, the observed reduction of deaminase activity has been related to the drastic alterations of hRIDA structure inferred by K-succinylation. The role of hRIDA and the importance of its K-succinylation in cell metabolism, especially in cancer biology, have been discussed. 相似文献
7.
热塑性复合材料用混纤预浸料特征 总被引:1,自引:0,他引:1
本文对热塑性复合材料用预浸料的结构及其在复合材料成型加工中的浸渍性能进行分析. 相似文献
9.
农药品种及其原料中间体的现状和展望 总被引:4,自引:0,他引:4
介绍了近年来新开发的农药品种及所需的原料和中间体,并提出了发展建议。 相似文献
10.