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1998

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Articles 1 - 30 of 565

Full-Text Articles in Physical Sciences and Mathematics

The Effect Of Suspended Particles On The Corrosion Resistance Of Electrodeposited Zinc Powders, Qingwen Li, Qing Yang, Xi Xia Nov 1998

The Effect Of Suspended Particles On The Corrosion Resistance Of Electrodeposited Zinc Powders, Qingwen Li, Qing Yang, Xi Xia

Journal of Electrochemistry

Zinc powders were electrodeposited from ZnCl 2 baths with containing suspension of unsoluble particles such as graphite, PbO 2,SnO 2,TiO 2, SiO 2 etc.. The structure, morphology and corrosion behavior of zinc powder were analyzed. SEM results showed that the dendritic growth of zinc can be inhibited by applying the suspension method. Suspension of PbO 2, SnO 2, TiO 2, SiO 2 and In 2O 3 could greatly improve the corrosion protection of zinc powder in 5 mol/L KOH. In addition, fractal theory is employed to further explain the results.

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Primary Research Of Reversible Proton Exchange Membrane Regenerative Fuel Cells, Zhigang Shao, Baolian Yi, Ming Han Nov 1998

Primary Research Of Reversible Proton Exchange Membrane Regenerative Fuel Cells, Zhigang Shao, Baolian Yi, Ming Han

Journal of Electrochemistry

In this paper, we report the results of our studies on regenerative proton exchange membrane fuel cell(RPEMRFC) catalysts, electrode preparation and their performances. The Pt catalyst for the oxygen electrode was replaced by 60 w%Pt+40 w%IrO 2 which reduces polarization by 0.2 V in a polymer protone exchange membrane fuel cell. The cycle performance of RPEMRFC was found to be manly effected by the stability of the diffiusion layer of bifunctional oxygen electrode.

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The Latest World Wide Progress In Solid Oxide Fuel Cell, Jiang Yi Nov 1998

The Latest World Wide Progress In Solid Oxide Fuel Cell, Jiang Yi

Journal of Electrochemistry

Solid oxide fuel cell(SOFC) is a novel, green electricity generation technology, which has been showing rapid development since 1980's. In light of its high efficiency, environmental friendly, fuel adaptability and long term stability, the Research, Development and Demonstration(RD&D) of this hype of full cell have been emphasized in a large number of developed countries. Based on the information communicated at the latest symposium on SOFC held last year in Aachen(Germany) and the knowledge gained through years of research in this field, a comprehensive review on the latest development of the tubular, this planar SOFC as well as on a number …

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Electrochemical Investigation Of Effect Of Br - On Redox Behavior Of (Tpp)Co, Chuanwei Yan, Haichao Lin Nov 1998

Electrochemical Investigation Of Effect Of Br - On Redox Behavior Of (Tpp)Co, Chuanwei Yan, Haichao Lin

Journal of Electrochemistry

The effect of Br - anion on electrochemical behavior of (TPP)Co was investigated in 1,2 dichloroethane solution by microelectrode and thin layer cyclic voltammetry technique. It was found that the axially coordination of one Br - anion to (TPP)Co(Ⅲ)(Br -) 2 shifts the potential of porphyrin system to more positive value. The reduction peak of 0.12 V(vs.SCE) is attributed to the reduction of (TPP)Co(Ⅲ)(Br -). It is also postulated that the reduction of (TPP)Co(Ⅲ)(Br -) 2 occurred at a more negative potential where the reduction of the Co(Ⅱ)/Co(Ⅰ) process happened.

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Studies On The Inclusion Behavior Of Cyclodextrins With Ketoprofen By Electrochemical Methods, Jun Gu, Yong Zhang, Jinhao Pan Nov 1998

Studies On The Inclusion Behavior Of Cyclodextrins With Ketoprofen By Electrochemical Methods, Jun Gu, Yong Zhang, Jinhao Pan

Journal of Electrochemistry

The influences of cyclodextrins and their derivatives on the electrochemical behavior of ketoprofen were studied. The inclusion constants of ketoprofen with β CD,HP β CD and methyl β CD and the influences of temperature on the inclusion actions were also investigated. The inclusion phenomena is explained with the thermodynamics parameters of the inclusion complexes.

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Study On Electrosynthesis Of Butyl Butyrate At Conducting Oxide Anode Support On Titanium, Junxiang He, Jincheng Zhou Nov 1998

Study On Electrosynthesis Of Butyl Butyrate At Conducting Oxide Anode Support On Titanium, Junxiang He, Jincheng Zhou

Journal of Electrochemistry

Synthesis of butyl butyrate by direct electroxidation of n butyl alcohol and the electrochemical behaviors of several selected conducting oxide electrodes (Pb/PbO 2、Ti/PbO 2、i/SnO 2 +Sb 2O 3 /PbO 2 and Ti/SnO 2+Sb 2O 3+PdO x/PbO 2) have been investigated. The results demonstrated that the intermediate layers of SnO 2、Sb 2O 3 and PdO x could significantly decrease the interfacial resistance of the electrodes,and that the Ti/SnO 2+Sb 2O 3+PdO x/PbO 2 electrode possessed better electrocatelytic performance than others.

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Oxygen Evolution Behavour On Ni Electrode In Koh Solution, Xiaoyan Cao, Huatang Yuan, Zuoxiang Zhang Yunshi Zhou Nov 1998

Oxygen Evolution Behavour On Ni Electrode In Koh Solution, Xiaoyan Cao, Huatang Yuan, Zuoxiang Zhang Yunshi Zhou

Journal of Electrochemistry

The steady_state polarization curves of oxygen evolution were measured at temperatures between 22～70 ℃ on Ni electrode in 30 wt.% KOH solution by galvanostat methode. The exchange current densities, Tafel slopes and transfer coefficients were studied. It was found that 40 ℃ is a special temperature, near which the kinetic parameters change abrupdy. The Tafel slopes for oxygen evolution reactions at higher overpotentials change from more than 120 mV to about 70 mV when the temperature raises to 40～70 ℃ from 22～35 ℃. Simultaneously, the heat of activation is changes from 79.88 kJ/mol to 55.32 kJ/mol. Moreover, the -(η/Τ) i …

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Studies Of Spinal Li 1+X Mn 2-X O 4 Rechargeable Lithium Ion Battery, Xiaomei Wu, Qinghe Yang, Zhongkao Jin, Haoqing Wu, Xiangfu Zong Nov 1998

Studies Of Spinal Li 1+X Mn 2-X O 4 Rechargeable Lithium Ion Battery, Xiaomei Wu, Qinghe Yang, Zhongkao Jin, Haoqing Wu, Xiangfu Zong

Journal of Electrochemistry

The spinel Li intercalation compound Li 1+ x Mn 2- x O 4(0< x <1) was prepared by using techniques of cyclic voltammetry. The electrochemical parameters of Li 1+ x Mn 2- x O 4 electrode vary as either the starting materials or the synthesis temperature changes. It was found that the initial capacity and reversible behaviors of the Li 1+ x Mn 2- x O 4 electrode depends on the amount of the excess Li, represented as x in Li 1+ x Mn 2- x O 4. The reversible of Li intercalation process for Li 1+ x Mn 2- x O 4 electrode was demonstrate by cyclic voltammograms.

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Corrosion Characteristics Of Electrodeposited Ni Mo P Alloy Immersed In Nacl Solution, Yue Zeng, Hongxin Huang, Xiaoming Xiao, Shixun Lian Nov 1998

Corrosion Characteristics Of Electrodeposited Ni Mo P Alloy Immersed In Nacl Solution, Yue Zeng, Hongxin Huang, Xiaoming Xiao, Shixun Lian

Journal of Electrochemistry

The corrosion characteristics of electrodeposited Ni Mo P alloy immersed in 5wt.% NaCl solution were investigated using immersion, anodic polarization curves, XPS and AES analysis. The corrosion rates of amorphous Ni Mo P alloys are lower than that of crystalline Ni Mo P alloys. Anodic polarization curve experiments show that for the electrodeposited Ni Mo P alloys, the nickel mol fraction of which has in between 0.719 and 0.868, the corrosion potential moves to positive with the increase of P content, and the peak current value of active region increase with the increase of Mo content in alloys, though the …

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Drect Electro_Oxidation Synthesis Of D Arabinose On Spectroscopic Graphite Electrode, Hei Wei, Huang Ying Nov 1998

Drect Electro_Oxidation Synthesis Of D Arabinose On Spectroscopic Graphite Electrode, Hei Wei, Huang Ying

Journal of Electrochemistry

D Arabinose synthesized by direct electro_oxidative decarboxylation of D gluconate on graphite electrode from aqueous solutions. The effects of D gluconate concentration, electrolysis potential, temperature and electrolyte composition on the current efficiency and product yield of electrosynthsis are discussed. The laboratory scale electrosynthesis was achieved with flow through cell.The optimum technology conditions for electrosynthesis were obtained with orthogonal design method.Both galvanostatic and potentionstatic conditions have been exploited, the later was found to be more effective.

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The Study On The Performance Of Mcfc Matrix Prepared By Flow Cast, Huaxin Lin, Baolian Yi, Naichao Li, Tianxi Qu, Enjun Zhang, Lianyin Kong, Yingcai Chen Nov 1998

The Study On The Performance Of Mcfc Matrix Prepared By Flow Cast, Huaxin Lin, Baolian Yi, Naichao Li, Tianxi Qu, Enjun Zhang, Lianyin Kong, Yingcai Chen

Journal of Electrochemistry

The matrix for MCFC were prepared by flow cast technique which gives reproducible and reliable results. Its mean pore radius is about 0.18 μm, and the porosity is about 65%. The performance of MCFC stacked with this type of matrix is 0.854 V at 200 mA/cm 2.

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Study On Ni Co S Mo Alloys New Cathode Material For Aquous Electrolysis, Yuanshou Xie, Quanfeng Liu Nov 1998

Study On Ni Co S Mo Alloys New Cathode Material For Aquous Electrolysis, Yuanshou Xie, Quanfeng Liu

Journal of Electrochemistry

The parameters of electrodeposion of Ni Co S Mo alloy were studied. The experimental results indicate that the electrodeposition alloy shows high catalytic activity for hydrogen evolution reaction, as well as better mechanical strength and higher chemical stability. The mechanism of catalytic hydrogen evolution reaction on this type of alloy electrode was also investigated by means of polarization curve and cyclic voltametry.

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A Preliminary Study Of The Synthesis Of Tin Based Amorphous Material And Its Behavior On Lithium Intercalation, Li Liu, Hanxi Yang, Jutang Sun, Xingping Ai Nov 1998

A Preliminary Study Of The Synthesis Of Tin Based Amorphous Material And Its Behavior On Lithium Intercalation, Li Liu, Hanxi Yang, Jutang Sun, Xingping Ai

Journal of Electrochemistry

An amorphous lithium inserting anode material based on Tin oxide glass was synthesized by salification in solution and its properties on lithium intercalation was investigated by X ray diffraction(XRD), microelectrode voltammetry and charge discharge measurements. The results have shown that this kind of material has considerable electrochemical reversibility toward lithium intercalation deintercalation. The available discharge capacity of the material reaches 430 mA·h/g with charge_discharge efficiency over 90%, showing a great potential for practical use.

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Study Of The Effect Of Rare Earth Ions On Dna Using Cyclic Voltammetry And Spectroscopy, Heibai Shen, Yuzhuan Kang, Haifeng Yang, Lin Yu, Zongrang Zhang Nov 1998

Study Of The Effect Of Rare Earth Ions On Dna Using Cyclic Voltammetry And Spectroscopy, Heibai Shen, Yuzhuan Kang, Haifeng Yang, Lin Yu, Zongrang Zhang

Journal of Electrochemistry

The interaction between rare earth ions(e.g.Eu 3+ ,Ce 3+ ,Er 3+ ,Sm 3+ ,Tb 3+ ,La 3+ and Nd 3+ ) and DNA had been investigated by using Cyclic Voltammetry, Ultraviolet and Raman Spectroscopy. After the adding of Ce 3+ ion to DNA solution, the cathodic peak current of Ce 3+ ion reduction was found to decrease obviously, and the anodic peak current to decrease even more significantly. Differential UV spectra of Ce 3+ ion depicted hyperchromic effect after the reaction of these two species and a new peak of 272 nm was found. Differential UV spectra of DNA also …

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The Study Of Poly [N (3 Ferrocene Acetamino Propyl Pyrrole] Film Modified Glucose Electrode, Chengyun Tian, Jing Chen, Li Zhang Nov 1998

The Study Of Poly [N (3 Ferrocene Acetamino Propyl Pyrrole] Film Modified Glucose Electrode, Chengyun Tian, Jing Chen, Li Zhang

Journal of Electrochemistry

A poly [N (3 ferrocene acetamino propyl pyrrole)]film modified electrode was fabricated and studied by cyclic voltammetric method. The result shows that the modified electrode can give stable redox peaks of ferrocene, and an obvious catalytic peak due to glucose; This modified electrode was used to tabricate a glucose sensor which operates at +0.2 V, so that the ascorbic acid or uric acid doesn't affect the accuracy detection of glucose concentration. The sensor has a linear range of 0.1～10 mmol/L glucose, which the period of long term stability and response time of the sensor are about ten days and 2 …

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Study On The Ti/Sno 2/Pbo 2 Anode In Sulphuric Acid Solution, Yaogang Li, Yanpin Shun, Wenlin Xu Nov 1998

Study On The Ti/Sno 2/Pbo 2 Anode In Sulphuric Acid Solution, Yaogang Li, Yanpin Shun, Wenlin Xu

Journal of Electrochemistry

The Ti/SnO 2/PbO 2 electrode, prepared by the electrodeposition method, was tested as the anode for the oxygen evolution reaction in 1 mol/L H 2SO 4 solution and examined by means of EDS, SEM and XRD. The electrocatalytic activity and the electrochemical stability of the prepared electrode were found to be superior.

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Natural Math, Maria Droujkova Nov 1998

Natural Math, Maria Droujkova

Humanistic Mathematics Network Journal

No abstract provided.

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Do The Great While It Is Still Small: Humanistic Teaching In The Elementary School, John Eichinger Nov 1998

Do The Great While It Is Still Small: Humanistic Teaching In The Elementary School, John Eichinger

Humanistic Mathematics Network Journal

No abstract provided.

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The Legend Of The Apple, Raul A. Simon Nov 1998

The Legend Of The Apple, Raul A. Simon

Humanistic Mathematics Network Journal

No abstract provided.

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Mathematics Found In Poetry, Alexis Mann Nov 1998

Mathematics Found In Poetry, Alexis Mann

Humanistic Mathematics Network Journal

No abstract provided.

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Plastic Pebbles, Virginie H. Mitchem Nov 1998

Plastic Pebbles, Virginie H. Mitchem

Humanistic Mathematics Network Journal

No abstract provided.

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What Does Equality Mean?--The Basque View, Marcia Ascher Nov 1998

What Does Equality Mean?--The Basque View, Marcia Ascher

Humanistic Mathematics Network Journal

No abstract provided.

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On Solving Equations, Negative Numbers, And Other Absurdities: Part Ii, Ralph A. Raimi Nov 1998

On Solving Equations, Negative Numbers, And Other Absurdities: Part Ii, Ralph A. Raimi

Humanistic Mathematics Network Journal

No abstract provided.

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Architecture And Mathematics: An Introduction For Elementary And Middle School Children, Kim Williams Nov 1998

Architecture And Mathematics: An Introduction For Elementary And Middle School Children, Kim Williams

Humanistic Mathematics Network Journal

No abstract provided.

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Nine And One Third Circles Of Rejoicing, Michael Capobianco Nov 1998

Nine And One Third Circles Of Rejoicing, Michael Capobianco

Humanistic Mathematics Network Journal

No abstract provided.

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Manifesto On Mathematical Education, Saunders Mac Lane Nov 1998

Manifesto On Mathematical Education, Saunders Mac Lane

Humanistic Mathematics Network Journal

No abstract provided.

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From My Dance Is Mathematics: Poems From A Mathematics Teacher, Joanne S. Growney Nov 1998

From My Dance Is Mathematics: Poems From A Mathematics Teacher, Joanne S. Growney

Humanistic Mathematics Network Journal

No abstract provided.

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สรุปข่าวสิ่งแวดล้อม : กรกฎาคม-กันยายน 2541 Oct 1998

สรุปข่าวสิ่งแวดล้อม : กรกฎาคม-กันยายน 2541

Environmental Journal

No abstract provided.

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ปรอทในก๊าซธรรมชาติ, มารยาท วีรกรม Oct 1998

ปรอทในก๊าซธรรมชาติ, มารยาท วีรกรม

Environmental Journal

No abstract provided.

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ความสำคัญของคุณภาพน้ำต่อทรัพยากรสัตว์น้ำจืด ในอ่างเก็บน้ำลำตะคอง จังหวัดนครราชสีมา, เดชาพล รุกขมธุร์ Oct 1998

ความสำคัญของคุณภาพน้ำต่อทรัพยากรสัตว์น้ำจืด ในอ่างเก็บน้ำลำตะคอง จังหวัดนครราชสีมา, เดชาพล รุกขมธุร์

Environmental Journal

No abstract provided.

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