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Mixed Conduction in BaCe0.8Pr0.2O3-α Ceramic

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Chinese Journal of Chemical Physics 2008年第3期21卷 286-290页

作者： Mao-yuan Wang Li-gan qiu School of Chemistry and Chemical Engineering Yancheng Teachers College Yancheng 224051 China

BaCe0.8Pr0.2O3-α ceramic was synthesized by high temperature solid-state reaction. The structural characteristics and the phase purity of the crystal were determined using powder X-ray diffraction analysis. By using the methods of AC impedance spectroscopy, gas concentration cell and electrochemical pumping of hydrogen, the conductivity and ionic transport number of BaCe0.8Pr0.2O3-α were measured, and the electrical conduction behavior of the material was investigated in different gases in the temperature range of 500-900℃. The results indicate that the material was of a single perovskite-type orthorhombic phase. From 500℃ to 900 ℃, electronic-hole conduction was dominant in dry and wet oxygen, air or nitrogen, and the total conductivity of the material increased slightly with increasing oxygen partial pressure in the oxygen partial pressure range studied. Ionic conduction was dominant in wet hydrogen, and the total conductivity was about one or two orders of magnitude higher than that in hydrogen-free atmosphere （oxygen, air or nitrogen）

关键词： BaCe0.8Pr0.2O3-α AC impedance Gas concentration cell Electrochemical pumping of hy-drogen Mixed conduction

Inhibition of hematite on acid mine drainage caused by chalcopyrite biodissolution

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Chinese Journal of Chemical Engineering 2022年第4期35卷 94-104页

作者： Baojun Yang Wen Luo Maoxin hong Jun Wang Xueduan Liu Min gan Guanzhou qiu School of Minerals Processing and Bioengineering Central South UniversityChangsha 410083China Key Laboratory of Biohydrometallurgy Ministry of EducationCentral South UniversityChangsha 410083China Department of Dermatology The First Hospital of ChangshaChangsha 410005China

Even though biodissolution of chalcopyrite is considered to be one of the key contributors in the formation of acid mine drainage(AMD),there are few studies to control AMD by inhibiting chalcopyrite ***,a novel method of using hematite to inhibit chalcopyrite biodissolution was proposed and *** results indicated that chalcopyrite biodissolution could be significantly inhibited by hematite,which consequently decreased the formation of *** the presence of hematite,the final biodissolution rate of chalcopyrite decreased from 57.9%to 44.4%at 20 *** in turn suggested that the formation of AMD was effectively suppressed under such *** to the biodissolution results,mineral composition and morphology analyses,and electrochemical analysis,it was shown that hematite promoted the formation and accumulation of passivation substances(jarosite and Cu2-xS)on chalcopyrite surface,thus inhibiting the biodissolution of chalcopyrite and limiting the formation of AMD.

关键词： Chalcopyrite Hematite Biodissolution Acid mine drainage Acidithiobacillus ferrooxidans

Carbon-based materials for electrochemical dechlorination

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Nano Research 2023年第11期16卷 12543-12557页

作者： Guoqiang gan Guo hong Wenjun Zhang Center of Super-Diamond and Advanced Films(COSDAF) Department of Materials Science and EngineeringCity University of Hong KongHong Kong 999077China School of Materials Science and Engineering Dalian University of TechnologyDalian 116024China

Electrochemical dechlorination reaction(EDR)is a promising,environmentally friendly,and economically profitable technology for treating chlorinated organic *** efficient environmental protection,electrocatalysts with high stability and low cost are of extremely significance to the development of EDR ***-based materials have aroused broad interest as electrocatalysts for many electrochemical reactions due to their characteristics including large specific surface area,controllable structure,good conductivity,and chemical *** EDR,the carbon-based materials also show many unique superiorities,like strong adsorption capacity to chlorinated organic compounds(COCs),excellent catalytic activity and stability,and environmental *** review starts with a detailed summary on the mechanisms of electrochemical dechlorination(direct and indirect electron transfer pathway)and factors affecting the effectiveness of *** the paper comprehensively overviews the current progresses of carbon-based materials for EDR of COCs,following their two major application scenarios,i.e.,directly as electrocatalysts and as advanced supports for other ***,the formation of different active sites in carbon-based electrocatalysts and their EDR activities are ***,the current challenges and perspectives in this field are *** review will provide an in-depth understanding for the design of advanced carbon-based materials and promote the development of EDR technology.

关键词： carbon-based electrocatalysts carbon supports electrochemical dechlorination chlorinated organic compounds mechanism active sites

Bioleaching of chalcopyrite and bornite by moderately thermophilic bacteria: an emphasis on their interactions

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International Journal of Minerals,Metallurgy and Materials 2015年第8期22卷 777-787页

作者： hong-bo Zhao Jun Wang Xiao-wen gan Wen-qing Qin Ming-hao Hu Guan-zhou qiu School of Minerals Processing & Bioengineering Central South University Key Lab of Bio-hydrometallurgy of the Ministry of Education

Interactions between chalcopyrite and bornite during bioleaching by moderately thermophilic bacteria were investigated mainly by X-ray diffraction, scanning electron microscopy, and electrochemical measurements performed in conjunction with bioleaching experiments. The results showed that a synergistic effect existed between chalcopyrite and bornite during bioleaching by both Acidithiobacillus caldus and Leptospirillum ferriphilum and that extremely high copper extraction could be achieved when chalcopyrite and bornite coexisted in a bioleaching system. Bornite dissolved preferentially because of its lower corrosion potential, and its dissolution was accelerated by the galvanic current during the initial stage of bioleaching. The galvanic current and optimum redox potential of 390-480 m V vs. Ag/Ag Cl promoted the reduction of chalcopyrite to chalcocite(Cu2S), thus accelerating its dissolution.

关键词： chalcopyrite bornite bioleaching interactions redo

Drying characteristics, functional properties and in vitro digestion of purple potato slices dried by different methods

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Journal of Integrative Agriculture 2019年第9期18卷 2162-2172页

作者： qiu gan JIANG Yong-li DENG Yun Department of Food Science and Technology Shanghai Jiao Tong University

The drying characteristics,physico-chemical and functional properties,as well as starch digestibility,of purple potato slices dried using different methods(such as,vacuum freeze-drying,VFD;hot-air drying,HAD;air-impingement jet drying,AIJD;and far-infrared assisted heat-pump drying,FIHPD)were *** rate was the highest(3.0 g 100 g^-1 min^-1)using AIJD,followed by FIHPD and HAD,and the rate of VFD was the lowest one(0.3 g 100 g^-1 min^-1).Drying data were fitted to 12 thin-layer drying models,with the Midilli model giving the best ***,AIJD showed higher diffusivity(5.5×10^-10 m^2 s^–1)and energy efficiency(55 J g^-1)than any other drying method used in this *** reference to the samples dried by VFD,the starch granules of the samples obtained by HAD,FIHPD,and AIJD exhibited different extent of disruption,which significantly increased their water absorption capacity,swelling power,and in vitro digestibility,but decreased the peak *** sample resulting from AIJD had the greatest water absorption capacity(7.9 g g^-1)and solubility(21.6%),but the smallest syneresis rate(48%).Good correlation coefficients(R^2>0.98)implied that the pseudofirst order kinetic model adequately described the rate and extent of starch digestion of dried potato *** from AIJD and FIHPD showed the highest digestibility percentages,reaching to 72.4 and 72.5%.Based on the drying rate,specific energy consumption,functional properties and digestibility,AIJD appeared to be quite effective and suitable to be transferred on the industry scale.

关键词： purple potato air-impingement jet drying(AIJD) drying characteristics flour properties starch digestibility

Transretinoic acid inhibits rats gastric epithelial dysplasia induced by N-methyi-N-nitro-N-nitrosoguanidine:influences on cell apoptosis and expression of its regulatory genes

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World Journal of Gastroenterology 2001年第3期7卷 394-398页

作者： Ru Tao Cui gan Cai Zhao Bao Yin Yong Cheng qiu hong Yang Tao Tian Liver Center Beijing Friendship Hospital Affiliated to CapitalUniversity of Medical Sciences Department of Gastroenterology Shuguang Hospital Affiliated to Shanghai University of Traditional Chinese MedicineShanghai ChinaDepartment of Pathophysiology.Shanghai Medical University.ShanghaiChina Pathological Department Shanghai Medical University

INTRODUCTIONGastric epithelial dysplasia (GED) hypothetically is a straight-forward concept: dysplastic epithelium replacing the normal gastric epithelium of the stomach [1].In the stomach ,like any other segment of the gut ,it is defined as an unequivocal non-invasive epithelial change[2,3].The observation of gastric dysplasia as a cancerous lesion was recognized over a century ago ,but it is only after the advent of gastroscopy that its clinical significance has been stressed[4-7].

关键词： Animals Antigens, CD95 Antineoplastic Agents Apoptosis Caspase 1 Cyclin D1 Gastric Mucosa Gene Expression Immunohistochemistry Male Membrane Glycoproteins Methylnitronitrosoguanidine RNA, Messenger Rats Rats, Wistar Research Support, Non-U.S. Gov't Stomach Diseases Tretinoin

Numerical Evaluation of Two k-εTurbulence Model for Predicting Flow and Solidification in Continuous Casting Slab

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Journal of Iron and Steel Research International 2003年第2期10卷 10-16页

作者： LIU He-ping gan Yong qiu Sheng-tao Central Iron and Steel Research Institute

A steady three-dimensional fluid flow and solidification model was built based on CFD software by high-Reynolds-number and Lam-Bremhorst low-Reynolds-number k-ε *** the simulation,the fixed-grid enthalpy-porosity technique was used to represent the solidification,and Darcy law was adopted to simulate the flow in mushy *** prediction for steel flow and solidification was evaluated by the comparison of two turbulence *** is found that both Lam-Bremhorst low-Reynolds-number and high-Reynolds-number k-ε models predict the same trend of the steel flow and temperature ***,due to the effect of turbulent flow on heat transfer,the low-Reynolds-number turbulence model predicts longer penetration depth of molten steel in sub-mold region,less shell growth and higher shell surface temperature at the narrow face compared with standard k-ε model.

关键词： continuous slab caster solidification steel flow turbulence model numerical simulation

A reduced-order method for estimating the stability region of power systems with saturated controls

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Science China(Technological Sciences) 2007年第5期50卷 585-605页

作者： gan DeQiang XIN HuanHai qiu JiaJu HAN ZhenXiang Department of Electrical Engineering Zhejiang University Hangzhou 310027 China Department of Electrical Engineering Zhejiang University Hangzhou 310027 China Department of Electrical Engineering Zhejiang University Hangzhou 310027 China Department of Electrical Engineering Zhejiang University Hangzhou 310027 China

In a modern power system, there is often large difference in the decay speeds of transients. This could lead to numerical problems such as heavy simulation burden and singularity when the traditional methods are used to estimate the stability re- gion of such a dynamic system with saturation nonlinearities. To overcome these problems, a reduced-order method, based on the singular perturbation theory, is suggested to estimate the stability region of a singular system with saturation nonlinearities. In the reduced-order method, a low-order linear dynamic system with saturation nonlinearities is constructed to estimate the stability region of the primary high-order system so that the singularity is eliminated and the estimation process is simplified. In addition, the analytical foundation of the reduction method is proven and the method is validated using a test power system with 3 buses and 5 machines.

关键词： saturation nonlinearity, power system stabilizer, linear matrix inequality, singular perturbation method, reduced-order method

Income effects of poverty alleviation relocation program on rural farmers in China

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Journal of Integrative Agriculture 2021年第4期20卷 891-904页

作者： LENG gan-xiao FENG Xiao-long qiu Huan-guang School of Agricultural Economics and Rural Development Renmin University of ChinaBeijing 100872P.R.China College of Economics and Management China Agricultural UniversityBeijing 100083P.R.China

This paper analyses the impact of the poverty alleviation relocation(PAR)program on rural household income and evaluates the heterogeneous income effects of various relocation modes,based on a panel dataset of relocated households from 16 counties in eight Chinese *** results show that participation in the PAR increases the income of both rural and urban *** specifically,it has a significant positive effect on agricultural and wage income for rural and urban resettlers,*** analyses show that the income increase for rural resettlers was mainly due to agricultural technology training and that the income increase for town resettlers was attributed to medical *** the village resettlers,policies should focus on strengthening the development of local industries and training of agricultural *** the urban resettlers,non-agricultural employment and public services in the urban resettlement areas should be promoted.

关键词： targeted poverty alleviation poverty alleviation relocation relocation mode income effects