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1995

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Full-Text Articles in Physical Sciences and Mathematics

The Significance Of The Oso Condensate Project In The Nigerian Economy, I. P. Ojinnaka Dec 1995

The Significance Of The Oso Condensate Project In The Nigerian Economy, I. P. Ojinnaka

Bullion

This paper outlines the historical background and financing of the Oso condensate project, examines the benefits of the project in terms of revenue expectation, infrastructure development, employment and investment opportunities, benefit to the communities and owners of the project, as well as underline the potential constraints. For the ease of presentation, the paper is organised into sections and an introduction. Section I describes the features of the project while section II analyses the benefits. Section III outlines the potential constraints and section IV is summary and conclusion.

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Developments Of Fundamental Studies In Modern Electrochemistry──A Lecture For The National Advanced Workshop Of Modern Electrochemistry, Zhaowu Tian, Wenduan Su Nov 1995

Developments Of Fundamental Studies In Modern Electrochemistry──A Lecture For The National Advanced Workshop Of Modern Electrochemistry, Zhaowu Tian, Wenduan Su

Journal of Electrochemistry

This paper is a lecture notes spoken by profesor Tian to the national advancedworkshop of modern electrochemistry.The developments of fundamental studies of modernelectrochemistry are reviewed.outline of this subject as follows. 1. Importance of science and technology in electrochemistry 1.1 Electrochemical phenomena exist every where in nature1.2 Extensive applications of electrochemical technology 2.Electroch6mical systems and researches 2.1Characteristics 2.2Advantages 2.3Difficulties3.Advance the modern electrochemical fundamental study at atomic-molecular level3.l Comparisons between traditional and modern electrochemical studies 3. 2 Puzzles and strategy on the molecular-level study 3.3 Leap on molecular-level study──Opportunities

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Catalytic Oxidation Of Methanol On Pt/C-Spe And Ptru/C-Spe Electodes, Aihua Su, Changzhi Li, Gongquan Sun, Ying Zhang, Tianhong Lu Nov 1995

Catalytic Oxidation Of Methanol On Pt/C-Spe And Ptru/C-Spe Electodes, Aihua Su, Changzhi Li, Gongquan Sun, Ying Zhang, Tianhong Lu

Journal of Electrochemistry

Anode catalysts of methanol oxidation for direct methanol fuel cell, pt/C andPtRu/C,were prepared by chemical reduction in this work.The results indicated that the PtRu/Cshowed higher electrocatalytic activity than that of Pt/C. It was explained by XRD and XPS analysesthat the existence of Ru enhanced the catalytic activity for electrochemical oxidation of methanol.

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Growth Kinetics And Breakdown Of Passive Films On Rebar Electrodes In Simulated Cement Pore Solution, Wei Chu, Yuanxiang Shi, Baoming Wei Nov 1995

Growth Kinetics And Breakdown Of Passive Films On Rebar Electrodes In Simulated Cement Pore Solution, Wei Chu, Yuanxiang Shi, Baoming Wei

Journal of Electrochemistry

The growth kinetics and breakdown of passive films on REBAR electrodes insimulated cement solution(pH=12.5 and 13.8)have been investigated using in situphotoelectrochemical methods and potential step method. The results show that there are two mainstages in the growth of the film ,with two rate functions characterized by linear relation between thefilm thickness and the direct logarithm of time. There is a sign in laser-scanning photoelectrochemicalmicroscopic image just before the passive film breaks down. The addition of inhibitor NaNO_2changesthe growth kinetics and thickness of the film ,and therefore improves the resistance of pitting corrosioninduced by chloride.

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Application Of Electroanalytical Chemistry In Heteropoly Compounds System──Studies On The Redox Properties Of Bis( Undecatungstometalate)Lanthanates, Weiqing Wang, Xiumei Zhang Nov 1995

Application Of Electroanalytical Chemistry In Heteropoly Compounds System──Studies On The Redox Properties Of Bis( Undecatungstometalate)Lanthanates, Weiqing Wang, Xiumei Zhang

Journal of Electrochemistry

The redox properties of Ln(MW_(11))_2(M=As, Ti, Ga; Ln=La,ce,pr,Nd,Sm,Eu,Gd , Dy ) are systematically studied.It has been found that the redox order is La(AsW_(11))_2>La(TiW_(11))_2>La(GaW_(11))_2.The reduction process of Ln(MW_(11))_2 anion has been discussed.

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Cyclic Voltammetric Calorimetry Studying The Deposition Of Copper Of Pt Electrodes, Yongchun Zhu, Robin H J Clark Nov 1995

Cyclic Voltammetric Calorimetry Studying The Deposition Of Copper Of Pt Electrodes, Yongchun Zhu, Robin H J Clark

Journal of Electrochemistry

In the present paper,cyclic voltammetric calorimetry has been used to study thedeposition of copper on platinum electrode from LiClO_4 aqueous solution. Cyclic voltammetricthermogram and cyclic voltammetric differential thermogram show that the deposition of copper on theelectrode is an exothermal process with a strong interaction between copper and platinum layer(-3227.0 kJ /mol).The electrochemical oxidation of the deposited copper is composed of twoprocesses :an endothermal activation process with 747.0 kJ/mol of activation enthalpy,and anexothermal oxidation reaction with-189.9 kJ/mol of the reaction enthalpy, which are accord withthe data from the theoritical estimation and thermodynamic handbook respectively.

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Fabrication And Electrochemical Behaviors Of Thin Films Of Polyaniline By Langmuir-Blodgett Technique And Electropolymerization, Benzeng Hua, Zhaoxiong Xie, Yanzhen Chen Nov 1995

Fabrication And Electrochemical Behaviors Of Thin Films Of Polyaniline By Langmuir-Blodgett Technique And Electropolymerization, Benzeng Hua, Zhaoxiong Xie, Yanzhen Chen

Journal of Electrochemistry

Hydrogen-bond between stearic acid and aniline in subphase lead to Langmuirmonotayers of stearic acid-aniline,the molecular area of stearic acid-aniline is 26 nm￣2.With surfacepressure increased into 50 mN/M,the hydrogen-bond would be rearranged ,aniline moleculartransales into vertical from horizontal,surface pressure decreased quickly. A new kind of Langmuirmonolayer is formed instead of collapse,it's molecular area decreases into 24 nm￣2 and thicknessincreases with 0.25 nm. After electroreduction of L-B films depeited onto the surface ofSnO_2 electrode ,anilne layers between two stear acid matix could be polymerized into thin films ofpolyanilne.The structu re of thin films has ben studied by small angle X-ray scattering.Theelectrochemical properties …

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Simultaneous Detection System Combining Studies Of Programmedpotential Step Technique And Time-Resolved Ftir Spectroscopy, Shigang Sun, Xiaoyu Chen, Guoqiang Lu, Wenfeng Lin, Nanhai Li, Shenpei Chen, Hongping Dai, Jiqian Mu Nov 1995

Simultaneous Detection System Combining Studies Of Programmedpotential Step Technique And Time-Resolved Ftir Spectroscopy, Shigang Sun, Xiaoyu Chen, Guoqiang Lu, Wenfeng Lin, Nanhai Li, Shenpei Chen, Hongping Dai, Jiqian Mu

Journal of Electrochemistry

No abstract provided.

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Study Of The Modified Electrolytic Manganese Dioxide, Guohui Yuan, Dewei Chu, Rihui Shen, Hongwei Pan, Cuifen Zhang Nov 1995

Study Of The Modified Electrolytic Manganese Dioxide, Guohui Yuan, Dewei Chu, Rihui Shen, Hongwei Pan, Cuifen Zhang

Journal of Electrochemistry

A modified electrolytic manganese dioside doped with Bi(Bi-EMD)wasprepared and examined by XRD and XPS.It is predominantly γ-mnO_2 and the Bi exists as Bi_2O_3 inthe modified material.The content of Bi in Bi-EMDs increased with the increasement of Bi￣(3+)concentration in electrolyte,and reached14.3(wt)% from the bath of 0.008 mol·1￣(-1)Bi￣(3+)+ used.Some Zn /Bi-EMD prototype batteries of AA size were assembled,and which cycle life tests showedthat the Bi-EMD has better reversibility.

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Studies Of In-Situ Raman Spectroscopy On Deprotonation And Degeneration Of Ppy Films, Jinsong Gao, Jing Chen, Yanzhen Chen, Qi Xue, Zhongqun Tian Nov 1995

Studies Of In-Situ Raman Spectroscopy On Deprotonation And Degeneration Of Ppy Films, Jinsong Gao, Jing Chen, Yanzhen Chen, Qi Xue, Zhongqun Tian

Journal of Electrochemistry

By combining the in-situ Raman spectroscopic technique with the normalelectrochemical measurements ,the behavior and structure of PPY films in neutral or basic solutionswere studied.The oxidized PPY loses protons on the N atoms of pyrrole rings and is deprotonated inthese solutions ,resulting the formation of the quinoid structure. It makes the C=C stretching vibrationbonds of PPY split.Because this quinoid structure can′t be further oxidized ,the PPY becomes moredifficult to be oxidized and less reversible with the increasing of pH value of solutions and the degree ofdeprotonation of PPY. In the strong basic solution ( pH=13),the PPY film is degenerated in thepotential …

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Effect Of Deposition Conditions On The Texture Of Zinc Deposits, Shukai Xu, Fangzu Yang, Shaomin Zhou Nov 1995

Effect Of Deposition Conditions On The Texture Of Zinc Deposits, Shukai Xu, Fangzu Yang, Shaomin Zhou

Journal of Electrochemistry

In this paper,the effects of additives,complex agents and current densities on thetexture and grain size of the zinc deposits from zincate baths are studied by means of X raydiffraction. The results show that the existence of additive AA-1 causes the preferential orientationof(101) face;when DIE is added alone,the preferential orientation changes to(110) face;withadditives both DIE and AA-1,Zn deposits with highly preferential orientation of(110) are obtainedin a certain range of current densities,and if complex agents TEA and EDTA are simultaneouslyexisted ,fine granular and bright Zn deposits with highly preferential orientation can be obtained in thewider range of current densities.

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The Composition Structure And Corrosion Resistance Of Al-Mn Alloy Plating, Jiaju Guo Nov 1995

The Composition Structure And Corrosion Resistance Of Al-Mn Alloy Plating, Jiaju Guo

Journal of Electrochemistry

The Al-Mn alloy plating was electrodeposition from low temperature molten salts(below 200℃),its chemical composition control,corrosion resistance as well as the relationshipbetween chemical composition and structure were studied.The results indicate that the main effect onchemical composition of Al-Mn alloy plating is Mn ion concentration in molten salts.The Mn contentin the range of 25～40(wt)%, Al-Mn alloy plating has amorphous structure. In 0.5 mol/L H_2SO_4and NaCl solution ,corrosion resistance of the alloy plating is much better.When the alloy hasamorphous structure,corrosion resistance of plating has been remarkably increased.

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Influence Of O-Phenylenediamine On The Catalysis At Hrp Enzyme Electrode In L,4-Dioxane, Hong Chen, Hui-Huang Wu Nov 1995

Influence Of O-Phenylenediamine On The Catalysis At Hrp Enzyme Electrode In L,4-Dioxane, Hong Chen, Hui-Huang Wu

Journal of Electrochemistry

Horseradish peroxidase(HRP)was immobilized by crosslinkage on the glassycarbon electrode to prepare the enzyme electrede ,where the reduction of H_2O_2 was studied in l,4-dioxane media. It was shown that HRP electrode can catalyze the reduction of H_2O_2 without anymedintor,however, as an activator,o-phenylenediamine can promote the bio-catalysis. In thepresence of the activator,the parallel reactions occurred on the enzyme electrode. The workingcondition of the HRP electrede was investigated as the sensors for H_2O_2 and o-phenylenediamine,alsothe influence of water content in organic phase was discussed on the performance of the enzymeelectrode in organic phase.

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Study Of The Action Mechanism Of A New Type Additive Sd-1 On The Electrodepositional Process Of Zinc, Huaqiang Wu, Yiqin Yan, Guangming Ni Nov 1995

Study Of The Action Mechanism Of A New Type Additive Sd-1 On The Electrodepositional Process Of Zinc, Huaqiang Wu, Yiqin Yan, Guangming Ni

Journal of Electrochemistry

The action mechanism of a new type additive SD-1 on the electrodepositionalprocess of zinc is reported.The results showed that the additive SD-1 is not electrochemistry activesubstane in the range of adsorption potential at rotating disk electrede surface。 The action of additiveSD-1 on the electredepositional process of zinc is considerated to be fitting in with the diffusion controlmechanism。

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Application Of Electrochemistry In The Dyeing Of Fiber Textile, Bai Tong, Suzhen Gao, Zunze Wang, Jiling Wei Nov 1995

Application Of Electrochemistry In The Dyeing Of Fiber Textile, Bai Tong, Suzhen Gao, Zunze Wang, Jiling Wei

Journal of Electrochemistry

An electrochemical dyeing method of protein fiber-silk is presented,and aexperimental equation relating to the uptake a and trough voltage V is given. It is shown that theelectrochemical dyeing method can remarkably raise the uptake than common mtehod,reduce energyconsumption and cut down environment pollution. This is a new field for the application ofelectrochemistry.

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A Photoelectrochemical Investigation Of A.C.Modulated Passive Films On 304 Stainless Steel In Weak-Alkaline And Neutral Solution, Tianbao Du, Chunan Cao, Jiakang Yu, Haichao Lin Nov 1995

A Photoelectrochemical Investigation Of A.C.Modulated Passive Films On 304 Stainless Steel In Weak-Alkaline And Neutral Solution, Tianbao Du, Chunan Cao, Jiakang Yu, Haichao Lin

Journal of Electrochemistry

A photoelectrochemical investigation has been carried out on AISI 304 stainlesssteeI AV modulated passive film in 0.1mol/L Na_2B_4O_7 and 0.5 mol/L Na_2SO_4 solution.Photocurrentcurve depends on the potential、passive condition and testing solutions. The results of the measurementsindicate that the photoresponse is determined by the defects in the electronic structure of the films whenthe defects lead to localized states in the bandgap region. It is concluded that the passive film on AISI304 stainless steel is in a highly disordered amorphous state.

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Electrochemical Behaviors Of The Loaded Stainless Steel In Dilute Thiosulphate Solution, Changjian Lin, Zude Feng, Fuling Lin, Fayang Wang, Jianguang Tang, Yuanhui Wang Nov 1995

Electrochemical Behaviors Of The Loaded Stainless Steel In Dilute Thiosulphate Solution, Changjian Lin, Zude Feng, Fuling Lin, Fayang Wang, Jianguang Tang, Yuanhui Wang

Journal of Electrochemistry

The electrochemical behavior of l8/8 stainless steel in dilute thiosulphate solutionduring strained loading was studied by various electrochemical techniques and scanning electronmicroscope.It is evidenced that the corrosion activity of stainless steel increased with strained loading.The dynamic process of repassivation ,which may datermine the initiation ,the cease and developmentof the stress corrosion cracking for stainless steel ,was strongly influenced by both electrochemical andloading conditions. Pitting corrosion may locate preferentially on the sites which was suffered mostloading.The propagation of pitting corrosion of stainless steel may induce stress corrosion crakingunder certain conditions.

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Study On Properties Of Ti/Sno_2+Sb_2o_3/Pbo_2 Anode, Zhenhai Liang, Sen Wang, Yanping Sun, Wenlin Xu Nov 1995

Study On Properties Of Ti/Sno_2+Sb_2o_3/Pbo_2 Anode, Zhenhai Liang, Sen Wang, Yanping Sun, Wenlin Xu

Journal of Electrochemistry

A novel of anode-Ti/SnO_2+Sb_2O_3/PbO_2 was studied by means of SEM,EDS andXRD. The lifetime and kinetic parameters were determined in l mol/L H_2SO_4.The duel barrier modelwas used to interpret the results for the anode. The results show that the anode have better propertiesof electrochemistry and longer lifetime.

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On The Impact Of Forgetting On Learning Machines, Rūsiņš Freivalds, Efim Kinber, Carl H. Smith Nov 1995

On The Impact Of Forgetting On Learning Machines, Rūsiņš Freivalds, Efim Kinber, Carl H. Smith

School of Computer Science & Engineering Faculty Publications

People tend not to have perfect memories when it comes to learning, or to anything else for that matter. Most formal studies of learning, however, assume a perfect memory. Some approaches have restricted the number of items that could be retained. We introduce a complexity theoretic accounting of memory utilization by learning machines. In our new model, memory is measured in bits as a function of the size of the input. There is a hierarchy of learnability based on increasing memory allotment. The lower bound results are proved using an unusual combination of pumping and mutual recursion theorem arguments. For …

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Geology, Geochemistry And Geotectonic Setting Of Volcanics Comprising Küre (Kastamonu) Ore Mineralization, Şükrü Koç, Ahmet Ünsal, Yusuf Kağan Kadioğlu Oct 1995

Geology, Geochemistry And Geotectonic Setting Of Volcanics Comprising Küre (Kastamonu) Ore Mineralization, Şükrü Koç, Ahmet Ünsal, Yusuf Kağan Kadioğlu

Bulletin of the Mineral Research and Exploration

No abstract provided.

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Late Triassic (Carnian) Unconformity In A Block Of The Latest Cretaceous Volcanic Olistostrome Unit In The Izmir-Ankara Zone, Orhan Kaya, Walid Sadeddin, Demir Altiner, Güssun Akay Oct 1995

Late Triassic (Carnian) Unconformity In A Block Of The Latest Cretaceous Volcanic Olistostrome Unit In The Izmir-Ankara Zone, Orhan Kaya, Walid Sadeddin, Demir Altiner, Güssun Akay

Bulletin of the Mineral Research and Exploration

No abstract provided.

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Stratigraphic And Structural Setting Of The Anchimetamorphic Rocks To The South Of Tavşanli (Kütahya, Western Turkey): Relation To The İzmi̇r-Ankara Zone, Orhan Kaya, Walid Sadeddin, Demir Altiner, Engin Meri̇ç, İzver Tansel, Aylin Vural Oct 1995

Stratigraphic And Structural Setting Of The Anchimetamorphic Rocks To The South Of Tavşanli (Kütahya, Western Turkey): Relation To The İzmi̇r-Ankara Zone, Orhan Kaya, Walid Sadeddin, Demir Altiner, Engin Meri̇ç, İzver Tansel, Aylin Vural

Bulletin of the Mineral Research and Exploration

No abstract provided.

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Geological Characteristics Of The Aşiköy-Toykondu (Küre-Kastamonu) Massive Sulfide Deposits, Üner Çakir Oct 1995

Geological Characteristics Of The Aşiköy-Toykondu (Küre-Kastamonu) Massive Sulfide Deposits, Üner Çakir

Bulletin of the Mineral Research and Exploration

No abstract provided.

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Features Of The Tertiary Volcanizm Observed At Bi̇ga Peninsula And Gökçeada, Tavşan Islands, Tuncay Ercan, Muharrem Satir, Gideon Steinitz, Ayşin Dora, Ender Sarifakioğlu, Christoph Adls, Hans-Jürgen Walter, Talat Yildirim Oct 1995

Features Of The Tertiary Volcanizm Observed At Bi̇ga Peninsula And Gökçeada, Tavşan Islands, Tuncay Ercan, Muharrem Satir, Gideon Steinitz, Ayşin Dora, Ender Sarifakioğlu, Christoph Adls, Hans-Jürgen Walter, Talat Yildirim

Bulletin of the Mineral Research and Exploration

No abstract provided.

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Micro-Textural Features Of The Sandstones In The Üzümdere Formation (North Of Akseki̇, Antalya), Turhan Ayyildiz, Erdoğan Teki̇n, Nurettin Sonel, Mehmet Bülbül Oct 1995

Micro-Textural Features Of The Sandstones In The Üzümdere Formation (North Of Akseki̇, Antalya), Turhan Ayyildiz, Erdoğan Teki̇n, Nurettin Sonel, Mehmet Bülbül

Bulletin of the Mineral Research and Exploration

No abstract provided.

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New Petrographical Data At The Eastern Part Of Alanya Metamorphites (Anamur, S.Turkey), Veysel Işik, Okan Tekeli̇ Oct 1995

New Petrographical Data At The Eastern Part Of Alanya Metamorphites (Anamur, S.Turkey), Veysel Işik, Okan Tekeli̇

Bulletin of the Mineral Research and Exploration

No abstract provided.

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Geology Of The Akdağ Massif And Surroundings, Ali Yilmaz, Şükrü Uysal, Yavuz Bedl, Halil Yusufoğlu, Talat Havzoğlu, Ahmet Ağan, Deniz Göç, Nihal Aydin Oct 1995

Geology Of The Akdağ Massif And Surroundings, Ali Yilmaz, Şükrü Uysal, Yavuz Bedl, Halil Yusufoğlu, Talat Havzoğlu, Ahmet Ağan, Deniz Göç, Nihal Aydin

Bulletin of the Mineral Research and Exploration

No abstract provided.

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Features And Origin Of The Koçkale-Elaziğ Manganese Mineralizations, Mehmet Altunbey, Ahmet Sağiroğlu Oct 1995

Features And Origin Of The Koçkale-Elaziğ Manganese Mineralizations, Mehmet Altunbey, Ahmet Sağiroğlu

Bulletin of the Mineral Research and Exploration

Koçkale and its vicinity (Elazığ) is composed of four different units. These are; Upper Jurassic-Lower Cretaceous Guleman Group, Campanian-Maastrichtian Yüksekova Complex, Maastrichtian-Lower Eocene Hazar Group and Middle Eocene Maden Complex. The Mn mineralizations of Koçkale are situated in volcanosedmentary rocks of Maden Complex and occur in two types: (1) The mineralizations conformable with volcanosedimentary rocks, are the syngenetic and volcanosedimentary type. This type of mineralizations occur within mudstone and as a constituent of this unit, The mineralized bodies are tense and stratiform shaped. Any alteration related to mineralization is absent. Ore mineral assemblage is pyrolusite, psilomelane, rodokrosite, brauntte, manganite, limonite, …

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Tertiary Mollusk Fauna And Stratigraphy Of Pinarhi̇sar (Kirklareli̇) Area, Yeşim İslamoğlu, Güler Taner Oct 1995

Tertiary Mollusk Fauna And Stratigraphy Of Pinarhi̇sar (Kirklareli̇) Area, Yeşim İslamoğlu, Güler Taner

Bulletin of the Mineral Research and Exploration

No abstract provided.

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From The Editor, Alvin White Oct 1995

From The Editor, Alvin White

Humanistic Mathematics Network Journal

No abstract provided.

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