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Articles 1 - 30 of 532
Full-Text Articles in Physical Sciences and Mathematics
Hydrogeological, Hydrochemical And Isotopic Survey Of The Bayindir Geothermal Area (İzmi̇r, Western Anatolia, Turkey), Metin Bulut, Şevki Fi̇li̇z
Hydrogeological, Hydrochemical And Isotopic Survey Of The Bayindir Geothermal Area (İzmi̇r, Western Anatolia, Turkey), Metin Bulut, Şevki Fi̇li̇z
Bulletin of the Mineral Research and Exploration
No abstract provided.
Middle - Late Eocene Volcanism And Marine Ignimbrites In Bi̇ga Peninsula (Nw Anatolia - Turkey), Mustafa Dönmez, Ali Ekber Akçay, Ş,Can Genç, Şükrü Acar
Middle - Late Eocene Volcanism And Marine Ignimbrites In Bi̇ga Peninsula (Nw Anatolia - Turkey), Mustafa Dönmez, Ali Ekber Akçay, Ş,Can Genç, Şükrü Acar
Bulletin of the Mineral Research and Exploration
No abstract provided.
Foraminifer, Ostracod And Mollusc Fauna Of The Gulf Of Gemli̇k; Morphological Anomalies Observed In Foraminifer Tests, Sedimentological, Hidrochemical And Biochemical Characteristigs Of The Regi̇on, Engin Meri̇ç, Niyazi Avşar, Atike Nazi̇k, Bedri Alpar, Baki Yokeş, İpek F. Barut, Selma Ünlü
Foraminifer, Ostracod And Mollusc Fauna Of The Gulf Of Gemli̇k; Morphological Anomalies Observed In Foraminifer Tests, Sedimentological, Hidrochemical And Biochemical Characteristigs Of The Regi̇on, Engin Meri̇ç, Niyazi Avşar, Atike Nazi̇k, Bedri Alpar, Baki Yokeş, İpek F. Barut, Selma Ünlü
Bulletin of the Mineral Research and Exploration
No abstract provided.
Minerva 2005, The Honors College
Minerva 2005, The Honors College
Minerva
This issue of Minerva includes an article on the development of HON 170: Currents & Contexts; a discussion of the Honors College's "Last Lecture Series;" a reflection on the legacy of former Honors Program Director, Robert Thomson; and an article on the visual art found around the Honors College complex.
A Mathematical Journey Through The Land Of The Maya, Philip Scalisi, Paul Fairbanks
A Mathematical Journey Through The Land Of The Maya, Philip Scalisi, Paul Fairbanks
Bridgewater Review
No abstract provided.
Geology, Petrography And Geochemistry Of Andesites At The Eastern End Of Küçük Menderes Graben (Başova-Ki̇raz/İzmi̇r), Tahir Emre, Hasan Sözbi̇li̇r
Geology, Petrography And Geochemistry Of Andesites At The Eastern End Of Küçük Menderes Graben (Başova-Ki̇raz/İzmi̇r), Tahir Emre, Hasan Sözbi̇li̇r
Bulletin of the Mineral Research and Exploration
No abstract provided.
The Optimal Sulfonation Conditions Of Self-Doped Polyaniline Obtained By Using Experimental Strategies, Wen-Yar Li, Chi-Chang Hu
The Optimal Sulfonation Conditions Of Self-Doped Polyaniline Obtained By Using Experimental Strategies, Wen-Yar Li, Chi-Chang Hu
Journal of Electrochemistry
The optimal sulfonation condition of self-doped sulfonated polyaniline(prepared from leucoemeraldinebase;denoted as LEB-SPANI) with a high electronic conductivity was obtained by experimental strategies,includingthe fractional factorial design(FFD) and central composite design(CCD).From the FFD experiment,the self-doped LEB-SPANI prepared at a lowtemperature(4oC),a short reaction time(1 h),and a small volume of fumingsulfuric acid(10 mL) showed a better conductivity(ca.127 mS/cm).In the CCD study coupled with a confirmationtest,the highest conductivity(ca.141 mS/cm) of the LEB-SPANI film was obtained under a sulfonation temperatureof 4oC,a sulfonation time of75 minutes,and a volume of8 mLof30% fuming sulfuric acid.The textural cha-racter-istics of self-doped LEB-SPANI were characterized by Fourier transform infrared(FTIR) spectroscopy,four-pointprobe method,and X-ray …
Optimized Parameters For Electrochemical Fabrication Of P-Type Silicon-Based Two-Dimensional Photonic Crystals, Wan-Yun Zhang, Jia-Rong Ji, Xiao-Dong Yuan, Wei-Min Ye, Zhi-Hong Zhu
Optimized Parameters For Electrochemical Fabrication Of P-Type Silicon-Based Two-Dimensional Photonic Crystals, Wan-Yun Zhang, Jia-Rong Ji, Xiao-Dong Yuan, Wei-Min Ye, Zhi-Hong Zhu
Journal of Electrochemistry
A two-dimensional photonic band structure based on macroporous silicon with a gap centered at 20μm has been achieved for the first time.A medium doped p-type(100) silicon substrate was patterned by the standard photolithograpgy and alkaline efthing.And this pre-patterned sample was then etched 90 μm deep by electrochemical pore formation in the mixture of hydrofluoric-acid and dimethylformamide(DMF) to produce a quare lattice of circular air rods with a lattice constant of 3.8 μm and the very high aspect ratio up to 30.The optimized electrochemical parameters such as eletrolytical components and the current density were 5 % HF(by mass)+7 % H_(2)O(by mass)+DMF …
Copper Electrodeposition Under The Perturbation Of Hard Particles, Zeng-Wei Zhu, Di Zhu
Copper Electrodeposition Under The Perturbation Of Hard Particles, Zeng-Wei Zhu, Di Zhu
Journal of Electrochemistry
Copper electrodepositon was carried out on the rotating cathode,with hard particles(such as ceramic beads) filling between the electrodes.The rotation of cathode led hard particles to polish and impact the surface of deposit during electrodeposition.Copper deposits with a mass of cuspidal nodules were produced in acid sulfate solutions while brittle deposits without nodules were produced in alkaline sulfate solutions.It was also found that brightening and smoothing deposit could be obtained from the alkaline solution,and the deposit was approximatively disordered orientation with granular morphology of about 100~300 nm.The results show that the polishing and impact of hard particles can effectively disturb the …
Silicides And Composites Materials As Anodes For Lithium Ion Batteries, Jun-Mei Yan
Silicides And Composites Materials As Anodes For Lithium Ion Batteries, Jun-Mei Yan
Journal of Electrochemistry
The anode materials of Mg_(2)Si and MnSi were synthesized by mechanically activated annealing(MAA) techniques in this work and the in electrochemical performances were also studied.A series of composite materials of Mg_(2)Si and CNTs or CMS were prepared by ball-milling method respectively.The reversible capacities of the composites were higher than that of the pure Mg_(2)Si and pure carbon materials.The cyclic performances have been improved greatly by ball-milling of the Mg_(2)Si and carbon materials.Results show that ball-milling method is one kind of method to make alloy materials into practical use.
A Continuous Operation For Electroreduction Of Oxalic Acid To Glyoxylic Acid, Xiao-Hui Hu, Xiang-Fei Yan, Yu-Zhong Su, Jun Li
A Continuous Operation For Electroreduction Of Oxalic Acid To Glyoxylic Acid, Xiao-Hui Hu, Xiang-Fei Yan, Yu-Zhong Su, Jun Li
Journal of Electrochemistry
A simulative-continuous-operation approach was proposed to study the continuous operation for electroreduction of oxalic acid to gloxylic acid using a packed bed reactor and a parallel reactor with cooled cathode in order to solve the low productivity problem in current state by using traditional reactor.The effects of the concentration of oxalic acid and temperature on this process were also studied.Results showed that,after 30min of the reaction(residence time),the mass fraction of the produced glyoxylic acid in the catholic solution could reach 3.76% and 3.66% with respect to a saturated oxalic acid method and a step-temperature decreasing method.From this study,we conclude that …
Electrochemical Performance Of Li_(3.22)Na_(0.569)Mn_(5.78)O_(12.0), Qing-Song Tong
Electrochemical Performance Of Li_(3.22)Na_(0.569)Mn_(5.78)O_(12.0), Qing-Song Tong
Journal of Electrochemistry
By selecting LiOH·H_(2)O and Mn(CH_(3)COO)_(2)2H_(2)O as starting-materials,the positive materials with the structure characterization of Li_(4)Mn_(5)O_(12)and composition of Li_(3.22)Na_(0.569)Mn_(5.78)O_(12.0)were prepared by two-phase sintering method consisted of microwave and solid-state sintering processes.XRD patterns data showed that a pure Li_(4)Mn_(5)O_(12)phase was obtained by the fore-treatment of microwave sintering and the post-treatment of the solid-state sintering at 380℃.The charge-discharge tests showed that the newly prepared sample exhibited an initial capacity of 132 mAh·g~(-1)and its capacity faded after 100 cycles was 6.8% lower as compared with 1st cycle capacity in the voltage range of 4.5 to 2.5 V.The sample stored for 4 months exhibited an …
Electrochemical Oxidation Of Organic Additives In Tin Plating Electrolytes, Yin-Mei Cheng, Lan-Kun Cai, Qiang Song
Electrochemical Oxidation Of Organic Additives In Tin Plating Electrolytes, Yin-Mei Cheng, Lan-Kun Cai, Qiang Song
Journal of Electrochemistry
Cyclic voltammetry(CV) was used to characterize the voltammetric behaviours of organic additives,e.g.PSA(phenolsulfonic acid)、EN(ethoxylatedα-naphthol) and ENSA(ethoxylatedα-naphthol sulfonic acid),on the anode surface.In PSA solutions,an anodic peak was obtained and the peak potential was about 1.2V.In EN and ENSA solutions,two anodic peaks were obtained and the peak potentials were about(0.95V) and 1.3V.The products of galvanostatic electrolysis were separated by HPLC(high performance liquid chromatography) and analyzed by EI/MS(electron ionizing mass spectrometry).The mechnism of the electrochemical oxidation was also disussed.
The Electrocatalystic Investigation Of 3,4-Dihydroxybenzoic Acid On The Modified Multiply Wall Carbon Nanotubes, Ming-Qi Li
Journal of Electrochemistry
The electrochemical behavior of 3,4-Dihydroxybenzoic acid(DHBA)on modified multiply wall carbon nanotubes electrode was investigated by cyclic voltammetry(CV) and square wave voltammetry(SWV).Results show that in 0.1 mol/L HCl solutions the modified carbon nanotube electrode has an obvious electrocatalytic effect on the oxidation and deoxidization of DHBA.The oxidation current of DHBA is linear to it's concentration in the range of 4.0×10~(-6)～1.0×10~(-4) mol/L and 2.0×10~(-4)～8.0×10~(-4)1mol/L with correlation coefficient of 0.9995 and 0.9992.The detection limit is 1.0 ×10~(-6)mol/ L.
The Mechanism Of Ethylenediamine On Electroless Ni-B Alloy Deposition, Sen-Lin Wang
The Mechanism Of Ethylenediamine On Electroless Ni-B Alloy Deposition, Sen-Lin Wang
Journal of Electrochemistry
The effects of ethylenediamine stabilizer on the deposition rate and on the stability of the plating bath for electroless deposition of Ni-B alloy were investigated.It was found that the addition of ethylenediamine greatly enhances the stability of the electroless plating bath.The electrochemical polarization including cathodic and anodic polarizations measurements were carried out to examine the effect of ethylenediamine on the deposition process.The results show that ethylenediamine affects both the cathodic and the anodic polarization processes.The oxidation current of the reducer and the reduction current of Ni-B alloy decrease greatly when ethylenediamine was added into the plating bath.The infrared spectroscopy(IR) experiments …
Electrochemical Disinfection Method To Treat Wastewater From Hospitals, Lizhi-Fu Lizhi-Fu
Electrochemical Disinfection Method To Treat Wastewater From Hospitals, Lizhi-Fu Lizhi-Fu
Journal of Electrochemistry
Electrochemical disinfection method was used to treat wastewater from hospitals.The mechanism of electrochemical disinfection was researched by using the different anode materials.The results showed that when the titanium coated with noble metal(Ru、Pt、Ir)oxide was used as an anode and stainless steel as a cathode,the current density was 6 mA/cm~(2),hydraulic retention time was 15 min,air flow rate was 40 L/h,the rate of anode effective area to the inner water volume was 1.0,the amount of total colibacillus was below 500 CFU/L after electrochemical disinfection,All these meet the first order of Effluent Discharge Standard(GB8978-98).
Electrochemical Controllable Preparation Of Hydroxyapatite Coating With Different Morphologies And Preliminary In Vitro Tests, Hai-Yan Shi, Ren Hu, Chang-Jian Lin
Electrochemical Controllable Preparation Of Hydroxyapatite Coating With Different Morphologies And Preliminary In Vitro Tests, Hai-Yan Shi, Ren Hu, Chang-Jian Lin
Journal of Electrochemistry
The Controllable electrochemical deposition has been developed to prepare the hydroxyapatite(HA) coatings on Ti substrate with different morphologies and structures.Three kinds of typical topography of HA coatings,i.e.standing-up,flower and ordered porous structures have been obtained.The XRD and FTIR results demonstrate high crystallinity of the coating and exclusion of other forms of calcium phosphates.In vitro tests reveal that the biological property is largely dependent on the structure and morphology of the HA coating.It has been found that all pure HA coating show good biocompatibilities,while only the HA coating with ordered porous structures exhibits best bioactivities.
Electrochemical Properties Of Aloe Emodin In Aqueous And Nonaqueous Solvents, Li-Ying Huang, Zhong-Cheng Wang, Li-Min Lai, Xin-Hua Lin, Wei Chen
Electrochemical Properties Of Aloe Emodin In Aqueous And Nonaqueous Solvents, Li-Ying Huang, Zhong-Cheng Wang, Li-Min Lai, Xin-Hua Lin, Wei Chen
Journal of Electrochemistry
Electrochemical properties of Aloe emodin in aqueous and nonaqueous solvents of DMSO were studied by cyclic voltammetry and linear sweep voltammetry at a platinum electode.A pairs of currents on the voltammogram may be attributed to a quasi-reversible-one-electron transfer in HAc-NaAc and DMSO,the peak potential in DMSO was found to move more negatively compared with that in HAc-NaAc.A new method for Aloe emodin determination is described.The peak current is proportional to the concentration of Aloe emodin over the ranges of 1.0×10~(-5)~6.0×10~(-4)mol/L.(The electrochemical properties of Aloe emodin were related to solvents.)
Solid Oxide Fuel Cells-Materials And Prospects, Molenda Janina, Marzec Jacek
Solid Oxide Fuel Cells-Materials And Prospects, Molenda Janina, Marzec Jacek
Journal of Electrochemistry
The paper summarizes and discusses the basic properties of solid oxide fuel cell(SOFC) components(electrode materials and electrolyte) from the point of view of their essential functional parameters suck as chemicalstability,transport,catalytic and thermomechanical properties under operational conditions in a SOFC.An interrela-tion between the defect structure of these materials related to oxygen nonstoichiometry and their electronic propertiesand catalytic activity was shown.Single-chamber fuel cell concept was also presented.
The High Temperature Corrosion Of 2205 Duplex Stainless Steel With Nacl Deposit, Fu-Fu Peng, Chaur-Jeng Wang, Yu-Chang Lin
The High Temperature Corrosion Of 2205 Duplex Stainless Steel With Nacl Deposit, Fu-Fu Peng, Chaur-Jeng Wang, Yu-Chang Lin
Journal of Electrochemistry
The objective of this study was to figure out the hot corrosion behavior of 2205 duplex stainless steel(2205 DSS) within the temperature ranges from 550 to 850℃ in the static air condition with 2 mg/cm~(2)NaCl deposit,and in the air atmosphere condition with a constant flow rate of 500 vppm NaCl_((g)),respectively.Experimental results show that the hot corrosion kinetics met the parabolic rate law and the corrosion rate increased constantly with increasing temperature.The scales formed included Fe_(2)O_(3)/Fe_(3)O_(4)/Cr_(2)O_(3) and FeCr_(2)O_(4)from outer layer to inner layer.The sequence of formation is independent of the environment temperature,but the SiO_2 and NiO can be found in the …
A Study Of Three Corrosion Inhibitors For Reinforcing Steel In Sps Solution By Electrochemical Methods, Bing Zhao, Rong-Gui Du, Chang-Jian Lin
A Study Of Three Corrosion Inhibitors For Reinforcing Steel In Sps Solution By Electrochemical Methods, Bing Zhao, Rong-Gui Du, Chang-Jian Lin
Journal of Electrochemistry
Some electrochemical techniques such as linear polarization,electrochemical noise and EIShave been employedto study the inhibition behavior of N-lauroyl sarcosinate,β-sodium glycerophosphate and D-sodium gluconate for the reinforcing steel immersed in simulated concrete pore solution(SPS) with NaCl addition.The results show that D-sodium gluconatehas an obvious inhibitive effect for the reinforcing steelin containingCl~(-)SPS solution.It has been proposed that the corrosion inhibition of D-sodium gluconate is due to its competitive adsorption and precipitation on steel surface in the simulated concrete environment.
Effect Of Hco_3~-Concentration On Co_2 Corrosion In Gas And Oil Fields, Guo-An Zhang
Effect Of Hco_3~-Concentration On Co_2 Corrosion In Gas And Oil Fields, Guo-An Zhang
Journal of Electrochemistry
The effecs of HCO_3~-concentration on CO_(2) corrosion in gas and oil fields were investigated by carrying out potentiodynamic scans and weight loss tests.Potentiodynamic polarization curves showed that the cathodic current density decreased with cm increase of HCO_3~-concentration when [HCO_3~-] was lower than 0.042(mol/L.)The cathodic reations were promoted by increasing [HCO_3~-] when it reached 0.126 mol/L,(Anodic) behavior was an active process at low er [HCO_3~-] concentration and the anodic current density decreased with the increase of [HCO_3~-] concentration.An evident active-passive behavior exhibited in anodic process at 0.126 mol/L HCO_3~-.Under high pressure and high temperature,the corrosion rate of steel X65 decreased with …
An Investigation On Poly(Vinyl Chloride-Co-Isobutyl Vinyl Ether) Coatings Modified By Rutile Nano-Tio_2 Pastes, Xiang Bin
Journal of Electrochemistry
The anti-corrosion coating of Poly(Vinyl Chloride-Co-Isobutyl Vinyl Ether)(PVCCIVE) was modified by rutile nano-TiO_(2).The influence of nano-TiO_(2) pastes on the coating's corrosion resistance was investigated through electrochemistry impedance spectroscopy(EIS).The results show that the addition of nano-TiO_(2) pastes does not have obvious effect on the coating's performance of adhesion,flexility,impact resistance,but improves the coating's UV resistance and the gloss.Meanwhile,with the proper addition of rutile nano-TiO_(2) pastes,the(anti)-corrosion behavior of the coating was advanced.
A Study Of Overcharge Characteristic Of Lithium-Ion Cells, Jing Pang, Shi-Gang Lu, Sha Liu
A Study Of Overcharge Characteristic Of Lithium-Ion Cells, Jing Pang, Shi-Gang Lu, Sha Liu
Journal of Electrochemistry
The overcharge characteristics and effect factors of lithium-ion cells containing LiMn_(2)O_(4)cathodes were studied in detail.Overcharge testing of Lithium-ion cells with a systematic variation in the cell balance demonstrated that the overcharge characteristics of Lithium-ion cells was affected by the amount of cathode in the cells,which is independent of the amount of anode material.The rate of charge was found to be an important parameter,as electrolyte complete decomposition at low charge rates caused the end of overcharge testing,while high charge rates accelerated the rate of heat generation in the cells and the cell temperature increased as a result of insufficient heat dissipation.The …
An Electrochemical Study Of Electroless Copper Plating Using Glyoxylic Acid As Reducing Agent, Li-Qiong Wu, Fang-Zu Yang
An Electrochemical Study Of Electroless Copper Plating Using Glyoxylic Acid As Reducing Agent, Li-Qiong Wu, Fang-Zu Yang
Journal of Electrochemistry
The electroless copper plating using glyoxylic acid as a reducing agent,Na_(2)EDTA as a chelating agent and K_(4)Fe(CN)_(6) and 2,2'-dipyridyl as additives was studied.The effect of chelating agent and addtives on the polangation behaviovs of copper reduction and glyoxylie acid oxidation were analyzed by linear sweep voltammetry.The results mainly demonstrated that the chelating agent hindered both the oxidation of glyoxylic acid and the reduction of copper complexing ions.It has revealed that K_(4)Fe(CN)_(6)and 2,2'-dipyridyl(with the content over than 20 mg/L)both played negative actions on the oxidation of glyoxylic acid.
The Deactivation Mechanism Of Metal Oxide Anodes Under Alternative Current Electrolysis Condition, Jun-Tao Wang
The Deactivation Mechanism Of Metal Oxide Anodes Under Alternative Current Electrolysis Condition, Jun-Tao Wang
Journal of Electrochemistry
The metal oxide anodes coated on titanium used in seawater electrolysis were prepared by thermal decomposition.Their morphologies、compositions and phase structures were determined by scanning electron microscope(SEM)、energy dispersive X-ray detector(EDX) and X-ray diffraction(XRD).The electrochemical properties of the anodes were characterized by accelerated life test,cyclic voltammetry and electrochemical impedance spectroscopy.SEM、EDX and XRD showed that solid solution structures of(Ru,Ir,Ti)O_(2)and(Ir,Ti)O_(2) were formed after pyrolysis,the solid solution structures and active components were disappeared after the deactivation of the anodes.Electrochemical results indicated that the active area decreased and the coating resistance increased,which are resulted by active component falling off from the anode surfaces.Hence,the deactivation of the …
Determination Of Total Sugar Content In Sediments With Emmerich-A Method And Its Importance: An Example From Afyon-Karamik Lake, Gültekin Kavuşan, Ahmet Orhan
Determination Of Total Sugar Content In Sediments With Emmerich-A Method And Its Importance: An Example From Afyon-Karamik Lake, Gültekin Kavuşan, Ahmet Orhan
Bulletin of the Mineral Research and Exploration
No abstract provided.
Lithofacies Properties Of Antalya Tufas, Erdal Koşun, Ayşe Sarigül, Baki Varol
Lithofacies Properties Of Antalya Tufas, Erdal Koşun, Ayşe Sarigül, Baki Varol
Bulletin of the Mineral Research and Exploration
No abstract provided.
The Geology And Petrography Of The Late Neoproterozoic – Early Paleozoic Units Of Western Taurides (Sw Of Sandikli, Afyon), Semih Gürsu, M. Cemal Göncüoğlu
The Geology And Petrography Of The Late Neoproterozoic – Early Paleozoic Units Of Western Taurides (Sw Of Sandikli, Afyon), Semih Gürsu, M. Cemal Göncüoğlu
Bulletin of the Mineral Research and Exploration
No abstract provided.
Orientation Of The Andesitic Dykes In The İstanbul Region: An Approach To The Cretaceous Stress Distribution, Zahide Özgörüş, Aral I. Okay
Orientation Of The Andesitic Dykes In The İstanbul Region: An Approach To The Cretaceous Stress Distribution, Zahide Özgörüş, Aral I. Okay
Bulletin of the Mineral Research and Exploration
No abstract provided.