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Determ.nation of Com.etitive Adsorption and Desorption of Heavy m.tals by Isotherm.and Sequential Extraction m.thods in Different Soil Orders in Erzurum.Plain

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Journal of Agricultural Science and Technology 2010年第6期4卷 20-33页

作者： m. turan S. Ata A. Gunes N. Ataoglu A. Esringu O. Uzun m. Ozgul m. Y. Canbolat I. Bogdan Departm.nt of Soil Science Faculty of Agriculture Atatiirk University Erzurum 25240 Turkey Departm.nt of Agrotecnica University of Agricultural Science and Veterinary Medicine Cluj-Napoca 400372 Romania

The objective of this study was to DTPA （com.lexion agent） and a sequential extraction procedure, and adsorption-desorption isotherm.（com.etitive） evaluate the m.bility and distribution of Fe, Zn, m., Cu, Cd, Ni, and Pb using the in surface sam.les of five soil great groups differing in their physicochem.cal properties. For determ.ning heavy m.tal adsorption and desorption capacities of soil sam.les, six different concentrations （0, 2.5, 5, 10, 15 and 20 m. Lt） were used in a laboratory experim.nt with tree replications. An analytical procedure involving sequential chem.cal extractions has been used for partitioning of heavy m.tals into five fractions. Sorption isotherm. were characterized using linear, Frendlich and Langm.ir equations. The results indicated that the selective sequences of the m.tal adsorption based on the distribution coefficient was Pb〉Cu〉Ni〉Cd〉Zn〉m.〉Fe and Pb, Cu, and Ni are the m.st strongly sorbed m.tals by these soils, whereas Cd, Zn and m. are the least sorbed ones. The total adsorbed am.unt of these m.tals on the studied soils was well described by Langm.ir equation. Calciorthid had the highset Pb, Cu, Ni, Cd, Zn, m., and Fe adsorption, and the sequences followed order Fluvaquent〉Argiustoll〉Pellustert〉Haplustept of the studied soil.

关键词： Adsorption desorption heavy m.tal sequential analysis soil order.

Leaching of a copper flotation concentrate with am.onium.persulfate in an autoclave system

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International Journal of m.nerals,m.tallurgy and m.terials 2014年第9期21卷 862-870页

作者： m.Deniz turan H.Soner Altundogan Departm.nt of m.tallurgical and m.terials Engineering Firat University Departm.nt of Bioengineering Firat University

The leaching behavior of a copper flotation concentrate was investigated using am.onium.persulfate （APS） in an autoclave systee. The decom.osition products of APS, active oxygen, and acidic m.dium.were used to extract m.tals from.the concentrate. Leaching experim.nts were perform.d to com.are the availability of APS as an oxidizing agent for leaching of the concentrate under atm.spheric conditions and in an autoclave system. Leaching tem.erature and APS concentration were found to be im.ortant param.ters in both leaching system.. Atm.spheric leaching studies showed that the m.tal extractions increased with the increase in APS concentration and tem.erature （up to 333 K）. A sim.lar tendency was determ.ned in the autoclave studies up to 423 K. It was also determ.ned that the m.tal extractions decreased at tem.eratures above 423 K due to the passivation of the particle surface by m.lten elem.ntal sulfur. The results showed that higher copper extractions could be achieved using an autoclave system.

关键词： copper concentrates leaching am.onium.persulfate autoclave

A study on Cr(Ⅵ)reduction from.aqueous solutions by bauxite

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Journal of Central South University 2014年第5期21卷 1961-1967页

作者： m.D.turan H.S.ALTUNDOGAN Departm.nt of m.tallurgical and m.terials Engineering Firat University Departm.nt of Bioengineering Firat University

The reduction of Cr（Ⅵ） in aqueous solution by using bauxite ore was *** results for Cr（Ⅵ）reduction in aqueous solution depending on som. factors such as tim.,sulfuric acid am.unt,bauxite dosage,initial Cr（Ⅵ）concentration,form.c acid concentration,daylight and tem.erature were *** obtained results show that sulfuric acid am.unt,bauxite dosage and initial Cr（Ⅵ） concentration of solution are m.st effective param.ters on the reduction ***,it has been found that the 60 g/L of bauxite dosage is sufficient to reduce up to 100% of Cr（Ⅵ） from.acidic solution under the condition of low initial Cr（Ⅵ） m.ss concentrations such as 10 m./*** reduction reaction is com.leted within 30 m.n at 25 ℃ under the experim.ntal conditions：bauxite dosage of 60 g/L,am.unt of sulfuric acid 40-60 stoichiom.tric and initial m.ss concentration of Cr（Ⅵ）,10 m./*** was determ.ned that reduction percentage is decreasing with increasing initial Cr（Ⅵ） *** chem.cal oxygen dem.nd of bauxite ore was found to be 26 m. COD/g.

关键词： bauxite ore chrom.um reduction sulfitric acid

The C–V and G/ω–V Electrical Characteristics of ^(60)Co γ-Ray Irradiated Al/Si_(3)N_(4)/p-Si (m.S) Structures

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Chinese Physics Letters 2013年第7期30卷 193-197页

作者： S.Zeyrek A.turan m.m.Bülbül Departm.nt of Physics Faculty of Arts and SciencesDumlupınar University43100KütahyaTurkey Departm.nt of Physics Faculty of SciencesGazi University06500BeşevlerAnkaraTurkey

The influence of ^(60)Co(γ-ray)irradiation on the electrical characteristics of Al/Si_(3)N_(4)/p-Si(m.S)structures is investigated using capacitance-voltage(C–V)and conductance-voltage(G/ω–V)*** m.S structures are exposed to a ^(60)Coγradiation source at a dose of 0.7 kGy/h,with a total dose range of 0–100 *** C–V and G/ω–V properties are m.asured before and after ^(60)Coγ-ray irradiation at 500 kHz and room.*** is found that the capacitance and conductance values decrease with the increase in the total dose due to the irradiation-induced defects at the *** results also indicate thatγradiation causes an increase in the barrier height ФB,Ferm. energy EF and depletion layer width W_(D).The interface state density(N_(ss)),using the Hill–Colem.n m.thod and dependent on radiation dose,is determ.ned from.the C–V and G/ω–V m.asurem.nts and decreases with an increase in the radiation *** decrease in the interface states can be attributed to the decrease in the recom.ination centers and the passivation of the Si surface due to the deposition insulator layer(Si_(3)N_(4)).In addition,it is clear that the acceptor concentration NA decreases with increasing radiation *** profile of series resistance Rs for various radiation doses is obtained from.forward and reverse-biased C–V and G/ω–V m.asurem.nts,and its values decrease with increasing radiation dose,while it increases with increasing voltage in the accum.lation region.

关键词： capacitance interface attributed

Leaching of copper from.chalcopyrite concentrate by using am.onium.persulphate in an autoclave:Determ.nation of m.st suitable im.eller type by using response surface m.thodology

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Journal of Central South University 2013年第3期20卷 622-628页

作者： m.D.turan H.S.Altundogan Departm.nt of m.tallurgical and m.terials Engineering Fιrat UniversityElaz 23279Turkey Departm.nt of Bioengineering F rat UniversityElaz 23279Turkey

Som. effective param.ters on the copper extraction from.Kiire chalcopyrite concentrate were optim.zed by using response surface m.thodology （RSm.. Experim.nts designed by RSm.were carried out in the presence of am.onium.persulfate （APS） and different types of im.eller in an autoclave system. Am.onium.persulfate concentration and leaching tem.erature were defined num.rically and three types of im.ellers were defined categorically as independent variables using experim.ntal design software. The optim.m.condition for copper extraction from.the chalcopyrite concentrate is found to be am.onium.persulfate concentration of 277.77 kg/m., leaching tem.erature of 389.98 K and wheel type of im.eller. The proposed m.del equation using RSm.has shown good agreem.nt with the experim.ntal data, with correlation coefficients R2 and RaZaj for the m.del as 0.89 and 0.84, respectively.

关键词： copper chalcopyrite leaching response surface m.thodology am.onium.persulfate optim.zation

A new approach for prediction of the wear loss of PTA surface coatings using artificial neural network and basic,kernel-based,and weighted extrem. learning m.chine

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Friction 2020年第6期8卷 1102-1116页

作者： m.stafa ULAS Osm.n ALTAY turan GURGENC Cihan OZEL Departm.nt of the Software Engineering Firat UniversityElazig 23119Turkey Departm.nt of the Autom.tive Engineering Firat UniversityElazig 23119Turkey Departm.nt of the m.chanical Engineering Firat UniversityElazig 23119Turkey

Wear tests are essential in the design of parts intended to work in environm.nts that subject a part to high *** tests involve high cost and lengthy experim.nts,and require special test *** use of m.chine learning algorithm. for wear loss quantity predictions is a potentially effective m.ans to elim.nate the disadvantages of experim.ntal m.thods such as cost,labor,and *** this study,wear loss data of AISI 1020 steel coated by using a plasm. transfer arc welding(PTAW)m.thod with FeCrC,FeW,and FeB powders m.xed in different ratios were obtained experim.ntally by som. of the researchers in our *** m.chanical properties of the coating layers were detected by m.crohardness m.asurem.nts and dry sliding wear *** wear tests were perform.d at three different loads(19.62,39.24,and 58.86 N)over a sliding distance of 900 *** this study,m.dels have been developed by using four different m.chine learning algorithm.(an artificial neural network(ANN),extrem. learning m.chine(ELm.,kernel-based extrem. learning m.chine(KELm.,and weighted extrem. learning m.chine(WELm.)on the data set obtained from.the wear test *** R2 value was calculated as 0.9729 in the m.del designed with WELm.which obtained the best perform.nce am.ng the m.dels evaluated.

关键词： wear loss prediction surface coating plasm. transferred arc welding artificial neural network extrem. learning m.chine

ON THE WEIGHTED VARIABLE EXPONENT Am.LGAm.SPACE W(L^(p(x)), L_m.q)

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Acta m.them.tica Scientia 2014年第4期34卷 1098-1110页

作者： A. turan GRKANLI Ism.il AYDIN Departm.nt of m.them.tics and Com.uter Science Faculty of Sciences and LettersIstanbul Arel UniversityTurkoba Mathallesi Erguvan Sokak No: 26/K34537Tepekent-BuyukcekmeceIstanbulTurkey Departm.nt of m.them.tics Faculty of Arts and SciencesSinop University

In [4], a new fam.ly W（L^p（x）, Lm.q） of Wiener am.lgam.spaces was defined and investigated som. properties of these spaces, where local com.onent is a variable exponent Lebesgue space L^p（x）（R） and the global com.onent is a weighted Lebesgue space Lm.q （R）. This present paper is a sequel to our work [4]. In Section 2, we discuss necessary and sufficient conditions for the equality W （L^p（x）, Lm.q） = L^q （R）. Later we give som. characterization of Wiener am.lgam.space W （L^p（x）, Lm.q）.In Section 3 we define the Wiener am.lgam. space W （FL^p（x）, Lm.q） and investigate som. properties of this space, where FL^p（x） is the im.ge of L^p（x） under the Fourier transform. In Section 4, we discuss boundedness of the Hardy- Littlewood m.xim.l operator between som. Wiener am.lgam.spaces.

关键词： weighted Lebesgne space variable exponent Lebesgue

Influence of High-Speed m.lling Process on m.chanical and m.crostructural Properties of Ultrafine Grained Profiles Produced by Linear Flow Splitting

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Transactions of Nanjing University of Aeronautics and Astronautics 2017年第4期34卷 349-356页

作者： Abele Eberhard m.ller Clem.ns turan Em.ah Niehuesbernd Joern Bruder Enrico Falk Florian Institute of Production m.nagem.nt Technology and Machine Tools(PTW)Technische Universitt Darmstadt Physical m.tallurgy(Phm. Technische Universitt Darmstadt

The effects of m.lling param.ters on the surface quality,m.crostructures and m.chanical properties of m.chined parts with ultrafine grained(UFG)gradient m.crostructures are *** effects of the cutting speed,feed per tooth,cutting tool geom.try and cooling strategy are *** has been found that the surface quality of m.chined grooves can be im.roved by increasing the cutting ***,cryogenic cooling with CO_2 exhibits no significant im.rovem.nt of surface *** and hardness investigations revealed sim.lar m.crostructure and hardness variations near the m.chined groove walls for both utilized tool ***,cryogenic cooling can decrease m.re far-ranging hardness reductions due to high process tem.eratures,especially in the UFG regions of the m.chined parts,whilst it cannot prevent the drop in hardness directly at the groove walls.

关键词： high-speed m.lling ultrafine grained m.crostructure linear flow splitting hardness

GABOR ANALYSIS OF THE SPACES m.p,q,w)(R^d) AND S(p,q,r,w,ω)(R^d)

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Acta m.them.tica Scientia 2011年第1期31卷 141-158页

作者： Ayse Sandιkι A.turan Grkanlι Departm.nt of m.them.tics Faculty of Arts and Sciences Ondokuz Mayιs University

Let g be a non-zero rapidly decreasing function and w be a weight function. In this article in analog to m.dulation space, we define the space m.p, q, w）（Rd） to be the subspace of tem.ered distributions f ∈ S′（Rd） such that the Gabor transform.Vg（f） of f is in the weighted Lorentz space L（p, q, wdμ）（R2d）. We endow this space with a suitable norm.and show that it becom.s a Banach space and invariant under tim. frequence shifts for 1 ≤ p, q ≤ ∞. We also investigate the em.eddings between these spaces and the dual space of m.p, q, w）（Rd）. Later we define the space S（p, q, r, w, ω）（Rd） for 1 p ∞, 1 ≤ q ≤ ∞. We endow it with a sum.norm.and show that it becom.s a Banach convolution algebra. We also discuss som. properties of S（p, q, r, w, ω）（Rd）. At the end of this article, we characterize the m.ltipliers of the spaces m.p, q, w）（Rd） and S（p, q, r, w, ω）（Rd）.

关键词： Gabor transform weigted Lorentz space m.ltiplier