检索结果-南通市图书馆

Model for Evaluating Density of Molten Slag With Optical Basicity

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2010年第4期17卷 1-4页

作者： ZHANG Guo-hua chou kuo-chih School of Metallurgical and Ecological Engineering University of Science and Technology Beijing Beijing 100083China Department of Materials Seience and Engineering Shanghai University Shanghai 200072 China

A new model is proposed to estimate the density of molten slag, in which the temperature dependence of density is described by Arrhenius Law with the activation energy expressed as the linear function of optical basicity. Successful applications to the density calculations of CaO-Al2 O3-SiO2 and Al2 O3-CaO-MgO-SiO2 slag systems show that this formula can give a good description of composition and temperature dependence of density for molten slags. It is also found that the ionic band percentage of M-O band in MOx oxide is the intrinsic origin of the phenomenon that the slag with a high optical basicity has a large sensitivity to temperature.

关键词： density Arrhenius Law optical basicity molar volume ionic band

Decomposition mechanisms and non-isothermal kinetics of LiHC_2O_4·H_2O

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2012年第6期31卷 615-620页

作者： chou kuo-chih School of Materials Science and Engineering University of Science and Technology Beijing

The thermal decomposition process of LiHC2O4·H2O from 30 to 600 ℃ was investigated by the thermogravimetric and differential scanning calorimetry (TG-DSC). The phases decomposited at different temperature were characterized by X-ray diffraction (XRD), which indicated the decompositions at 150, 170, and 420℃, relating to LiHC2O4, Li2C2O4, Li2C2O4, and Li2CO3, respectively. Reaction mechanisms in the whole sintering process were determined, and the model fitting kinetic approaches were applied to data for non-isothermal thermal decomposition of LiHC2O4?H2O; finally, the kinetic parameters of each reaction were also calculated herein.

关键词： apparent activation energy non-isothermal reaction mechanism thermal decomposition

Calculation and Analysis of Sulfide Capacities for CaO-Al_2O_3-SiO_2-MgO-TiO_2 Slags

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2013年第9期20卷 21-25页

作者： REN Zhong-shan HU Xiao-jun chou kuo-chih State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing Department of Physical and Chemistry School of Metallurgical Ecological EngineeringUniversity of Science and Technology Beijing

The empirical models of sulfide capacity calculated by traditional optical basicity do not consider the charge compensation of alkaline metal ions to AP＋ in the molten slags, so that the deviations between the calculated values and measured ones of sulfide capacity are inevitable. The relation between sulfide capacity and the corrected optical basicity put forward by Mills considering the charge compensation was investigated. Combined with the relation be- tween sulfide capacity and temperatures, a novel and accurate calculation model of sulfide capacity was proposed, which was applied to calculate the sulfide capacities of CaO-Al2 O3-SiO2-MgO and CaO-Al2 03-SiO2-MgO-TiO2 sys-tems, where the sum of the CaO and MgO concentrations in the slags must be not lower than the Al2O3 concentra tion. It was also found that the calculated values were in a good agreement with the measured values, and the mean deviations were 2.57% and 2.65%, respectively.

关键词： slag sulfide capacity charge compensation corrected optical basicity mean deviation

Electroreduction Kinetics for Molten Oxide Slags

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2007年第1期14卷 16-20页

作者： GAO Yun-ming chou kuo-chih GUO Xing-min WANG Wei Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education Wuhan University of Science and Technology Wuhan 430081 Hubei China Metallurgical and Ecological Engineering School University of Science and Technology Beijing Beijing 100083 China

The oxygen-ion conductor, the reducing agent, and the molten oxide slag containing electroactive matter were used as constituent of a galvanic cell. Metal was directly electroreduced from molten slag using a short-circuit galvanic cell. The following galvanic cell was assembled in the present experiment： graphite rod, [-O]Fe-C saturated ｜ZrO2 （MgO）｜ Cu（1）＋（FeO）（slag） , and molybdenum wire. The FeO electroreduction reaction was studied through measuring short circuit current by controlling factors such as temperature, the FeO content in molten slags, and the external circuit resistance. An overall kinetics model was developed to describe the process of FeO electroreductiono It was found that the modeled curves were in good agreement with the experimental values. The new oxide reduction method in the metallurgy with controlled oxygen flow was proposed and the metallurgical theory with controlled oxygen flow was developed.

关键词： molten oxide slag zirconia galvanic cell electroreduction kinetics model

Effect of Acid Treatment on Electrocatalytic Performance of PtNi Catalyst

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2021年第3期37卷 686-695页

作者： GUO Ruihua QIAN Fei AN Shengli ZHANG Jieyu chou kuo-chih YE Jinyu ZHOU Zhiyou School of Materials and Metallurgy Inner Mongolia University of Science and TechnologyBaotou014010P.R.China Inner Mongolia Key Laboratory of Advanced Ceramics and Device School of Materials and MetallurgyInner Mongolia University of Science and TechnologyBaotou014010P.R.China School of Materials Science and Engineering Shanghai UniversityShanghai200072P.R.China Collaborative Innovation Center of Chemistry for Energy Materials State Key Laboratory of Physical Chemistry of Solid SurfacesCollege of Chemistry and Chemical EngineeringXiamen UniversityXiamen361005P.R.China

In this paper,we describe the synthesis of the AC-PtNi/G catalysts with graphene as the carrier,via the alcohol reduction and the sulfuric acid *** prepared catalysts were microscopically characterized by X-ray diffractometry(XRD),X-ray photoelectron spectroscopy(XPS),scanning electron microscopy(SEM),electron spectroscopy(EDAX),and transmission electron micros-copy(TEM).We tested the electrochemical performance of the prepared catalysts using an electrochemical workstation and in situ infrared spectroscopy(FTIR).The results showed that the acid-treated AC-PtNi/G catalysts had a more uniform dispersion and with the increased of treatment time,the particle size of the catalyst became *** the electrocatalytic performance of the AC-PtNi/G-48h catalyst treated with sulfuric acid for 48 h was significantly better than that of the untreated PtNi/G *** electrochemically active surface area was 76.63 m^(2)/g,and the peak current density value for catalytic oxidation of ethanol was 1218.83 A/g,which was 10 times that of ordinary commercial Pt/C *** steady-state current density value of 1100 s was 358.77 A/g,and it has excellent anti-CO toxicity *** was determined that a sulfuric acid treatment controlled catalyst particle size and increased the electrocatalytic activity of the catalytic oxidation of ethanol.

关键词： Platinum Graphene Acid treatment Particle size Electrocatalytic oxidation

Effects of pretreatment of substrates on the preparation of large scale ZnO nanotube arrays

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Rare Metals 2010年第1期29卷 21-25页

作者： GUO Xiao GUO Min ZHANG Mei WANG Xidong chou kuo-chih Department of Physical Chemistry. University qfScience and Technology Beijing Beijing 100083 China College of Engineering Peking University Beijing 100871 China

Well-aligned hexagonal ZnO nanotubes （NTs） arrays were synthesized on pretreated indium tin oxide （ITO） substrates by a simple hydro- thermal method. The morphology and structure of the products were characterized by scanning electron microscopy （SEM） and X-ray diffraction analysis （XRD）. A new method of substrate pretreatment was introduced to prepare ZnO coated films. The size of ZnO seeds and the formation rate of ZnO NTs were investigated. Further, the mechanism of the preparation of ZnO NTs was discussed. The photoluminescence （PL） spectrum measurement shows fairly internal defects existing in ZnO nanotubes.

关键词： nanotube arrays zinc oxide substrate pretreatment hydrothermal method annealing time

PVDF/6H-SiC composite fiber films with enhanced piezoelectric performance by interfacial engineering for diversified applications

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2024年第3期170卷 238-245页

作者： Linlin Zhou Tao Yang Chunyu Guo Kang Wang Enhui Wang Laipan Zhu Hailong Wang Sheng Cao kuo-chih chou Xinmei Hou Institute for Carbon Neutrality University of Science and Technology BeijingBeijing 100083China Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of SciencesBeijing 101400China School of Materials Science Engineering Zhengzhou UniversityZhengzhou 450001China State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures Guangxi UniversityNanning 530004China

Piezoelectric silicon carbide(SiC)has been quite attractive due to its superior chemical and physical properties as well as wide potential ***,the inherent brittleness and unsatisfactory piezoelectric response of piezoelectric semiconductors remain the major obstacles to their diversified ***,flexible multifunctional PVDF/6H-SiC composite fiber films are fabricated and utilized to assemble both piezoelectric nanogenerators(PENGs)and stress/temperature/light *** open cir-cuit voltage(V_(oc))and the density of short circuit current(I_(sc))of the PENG based on the PVDF/5 wt%6H-SiC composite fiber films reach 28.94 V and 0.24μA cm^(-2),showing a significant improvement of 240%and 300%compared with that based on the pure PVDF *** effect of 6H-SiC nanoparticles(NPs)on inducing interfacial polarization and stress concentration in composite fiber films is proved by first-principles calculation and finite element *** stress/temperature/light sensors based on the composite fiber film also show high sensitivity to the corresponding *** study shows that the PVDF/6H-SiC composite fiber film is a promising candidate for assembling high-performance energy harvesters and diverse sensors.

关键词： 6H-SiC PVDF Multifunctional composite fiber film Energy harvester Stress/temperature/light sensor

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

稀土镁合金中关键相及其界面与性能的相关性

中国有色金属学报 2019年第9期29卷 1934-1952页

作者：李谦周国治上海大学材料科学与工程学院上海200444 上海大学省部共建高品质特殊钢冶金与制备国家重点实验室上海200444 上海大学材料基因组工程研究院上海200444

镁合金是实现航空航天、交通运输、民用建筑等轻量化、缓解日益严重的能源问题的重要材料之一。本文以稀土镁合金为对象,聚焦多元体系中关键相对合金性能的作用机制,从热力学上分析稀土镁合金中的金属间化合物种类及其物相稳定性,进一... 详细信息

镁合金是实现航空航天、交通运输、民用建筑等轻量化、缓解日益严重的能源问题的重要材料之一。本文以稀土镁合金为对象,聚焦多元体系中关键相对合金性能的作用机制,从热力学上分析稀土镁合金中的金属间化合物种类及其物相稳定性,进一步总结相变动力学模型及其在稀土镁合金相转变机理分析中的应用。讨论相结构和界面对稀土镁合金力学性能、耐蚀性能和储氢性能的影响规律,展望通过调控关键相和第二相转变设计新型稀土镁合金的前景和发展方向。

关键词：稀土镁合金金属间化合物相界面热力学动力学

Efficient piezo-catalytic dye degradation using piezoelectric 6H-SiC under harsh conditions

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2024年第7期43卷 3173-3184页

作者： Lin-Lin Zhou Tao Yang Kang Wang Lai-Pan Zhu En-Hui Wang kuo-chih chou Hai-Long Wang Xin-Mei Hou Institute for Carbon Neutrality University of Science and Technology BeijingBeijing 100083China Institute of Steel Sustainable Technology Liaoning Academy of MaterialsShenyang 110000China Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of SciencesBeijing 101400China School of Materials Science Engineering Zhengzhou UniversityZhengzhou 450001China Beijing Advanced Innovation Center for Materials Genome Engineering Beijing University of Science and TechnologyBeijing 100083China

The development of novel piezoelectric catalysts against harsh conditions is indeed crucial for improving the piezo-catalytic degradation efficiency of colored organic dyes in *** this work,6H-SiC nanoparticles(NPs)are utilized to piezo-catalytic degrade rhodamine B(RhB)and methylene blue(MB)under ultrasonic vibration for the first *** degradation efficiency of RhB and MB reaches 98.8%and 98.7%within 80 *** piezoelectricity of 6H-SiC is comprehensively analyzed by the piezoresponse force microscope(PFM)and finite element method(FEM).The strong oxidizing active free radicals generated by the continuous piezoelectric polarized electric field of 6H-SiC,i.e.,·O_(2)^(-)and·OH,induce the decomposition reactions of colored organic dyes in *** the dyes are proven to degrade to harmless or less-harmful products gradually during the piezo-catalysis process by high-performance liquid chromatography tandem mass spectrometry(HPLC-MS).Moreover,RhB is also decomposed efficiently by 6HSiC NPs under acidic and alkaline *** results prove the feasibility of 6H-SiC for decomposing common water pollutants under harsh conditions and provide a new perspective for water purification.

关键词： Piezo-catalytic degradation 6H-SiC Rhodamine B(RhB) Methylene blue(MB) Harsh conditions