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Non-Thermal Atmospheric Plasma:Can it Be Taken as a Common Solution for the Surface Treatment of Dental Materials?

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Plasma Science and Technology 2016年第4期18卷 417-423页

作者： Emre SEKER mehmet Ali KILICARSLAN Serdar POLAT Emre OZKIR Suat PAT Department of Prosthodontics Faculty of DentistryEskisehir Osmangazi University Department of Prosthodontics Faculty of DentistryAnkara University Department of Prosthodontics Faculty of DentistryGazi University Department of Prosthodontics Faculty of DentistryAfyon Kocatepe University Faculty of Art and Science Eskisehir Osmangazi University

This study aimed to evaluate the surface roughness and wetting properties of various dental prosthetic materials after different durations of non-thermal atmospheric plasma（NTAP）*** hundred and sixty discs of titanium（Ti）（n：40）,cobalt chromium（Co-Cr）（n：40）,yttrium stabilized tetragonal zirconia polycrystals（Y-TZP）（n：40）and polymethylmethacrylate（PMMA）（n：40）materials were machined and smoothed with silicon carbide *** surface roughness was evaluated in a control group and in groups with different plasma exposure times [1-3-5 s].The average surface roughness（Ra）and contact angle（CA）measurements were recorded via an atomic force microscope（AFM）and tensiometer,*** changes were examined with a scanning electron microscope（SEM）.Data were analyzed with two-way analysis of variance（ANOVA）and the Tukey HSD test α=0.05）.According to the results,the NTAP surface treatment significantly affected the roughness and wettability properties（P 〈 0.05）.SEM images reveal that more grooves were present in the NTAP *** an increase in the NTAP application time,an apparent increment was observed for Ra,except in the PMMA group,and a remarkable reduction in CA was observed in all *** is concluded that the NTAP technology could enhance the roughening and wetting performance of various dental materials.

关键词： dental material atmospheric plasma surface treatment roughness contact angle

A novel indicator system for catalytic spectrophotometric determination and speciation of inorganic selenium species (Se(Ⅳ), Se(Ⅵ)) at trace levels in natural lake and river water samples

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Rare Metals 2011年第5期30卷 477-487页

作者： Ramazan Gürkan Halil brahim Ulusoy mehmet Akay Pinar Bulut Department of Chemistry Faculty of Science University of Cumhuriyet

A novel catalytic kinetic method is proposed for the determination of Se（Ⅳ）, Se（Ⅵ）, and total inorganic selenium in water based on the catalytic effect of Se（Ⅳ） on the reduction of Celestine blue by sodium sulfide at pH 7.0 phosphate buffer. The fixed-time method was adopted for the determination and speciation of inorganic selenium. Under the optimum conditions, the two calibration graphs are linear with a good correlation coefficient in the range 2-20 and 20-200 μg·L-1 of Se（Ⅳ） for the fixed-time method at 30℃. The experimental and theo- retical detection limits of the developed kinetic method were found to be 0.21 and 2.50 μg·L-1 for the fixed-time method （3 min）. All of the variables that affect the sensitivity at 645 nm were investigated, and the optimum conditions were established. The interference effect of various cations and anions on the Se（Ⅳ） determination was also studied. The selectivity of the selenium determination was greatly improved with the use of the strongly cation exchange resin such as Amberlite IR120 plus as long as chelating agents of thiourea and thiosulphate. The proposed kinetic method was validated statistically and through recovery studies in natural water samples. The relative standard deviations （RSDs） for ten replicate measurements of 2, 10, and 20 μg·L-1 of Se（Ⅳ） change between 0.35% and 5.58%, while the RSDs for ten replicate measurements of 3, 6, and 12 μg·L-1 of Se（Ⅵ） change between 0.49% and 1.61%. Analyses of a certified standard reference material （NIST SRM 1643e） for selenium using the fixed-time method showed that the proposed kinetic method has good accuracy. The Se（Ⅳ）, Se（Ⅵ）, and total inorganic selenium in lake and river water samples have been successfully determined by this method after selective reduction of Se（Ⅵ） to Se（Ⅳ）.

关键词： selenium speciation Celestine blue catalytic effect kinetic spectrophotometry natural waters

Analytical and approximate solutions of nonlinear Schrödinger equation with higher dimension in the anomalous dispersion regime

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Journal of Ocean Engineering and Science 2022年第2期7卷 143-154页

作者： Lanre Akinyemi mehmet Senol M.S.Osman Department of Mathematics Lafayette CollegeEastonPAUSA Nev¸s ehir HacıBekta¸s Veli University Department of MathematicsNev¸s ehirTurkey Department of Mathematics Faculty of ScienceCairo UniversityGiza 12613Egypt

The generalized Riccati equation mapping method(GREMM)is used in this paper to obtain different types of soliton solutions for nonlinear Schrödinger equation with higher dimension that existed in the regimes of anomalous ***,we use the q-homotopy analysis method combined with the Laplace transform(q-HATM)to obtain approximate solutions of the bright and dark optical *** q-HATM illustrates the solutions as a rapid convergent *** addition,to show the physical behavior of the solutions obtained by the proposed techniques,the graphical representation has been provided with some parameter *** findings demonstrate that the proposed techniques are useful,efficient and reliable mathematical method for the extraction of soliton solutions.

关键词： q-homotopy analysis method Generalized Riccati equation mapping method Laplace transform

Graph neural networks for an accurate and interpretable prediction of the properties of polycrystalline materials

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npj Computational Materials 2021年第1期7卷 925-933页

作者： Minyi Dai mehmet F.Demirel Yingyu Liang Jia-Mian Hu Department of Materials Science and Engineering University of Wisconsin-MadisonMadisonWIUSA Department of Computer Sciences University of Wisconsin-MadisonMadisonWIUSA

Various machine learning models have been used to predict the properties of polycrystalline materials,but none of them directly consider the physical interactions among neighboring grains despite such microscopic interactions critically determining macroscopic material ***,we develop a graph neural network(GNN)model for obtaining an embedding of polycrystalline microstructure which incorporates not only the physical features of individual grains but also their *** embedding is then linked to the target property using a feed-forward neural *** the magnetostriction of polycrystalline Tb_(0.3)Dy_(0.7)Fe_(2) alloys as an example,we show that a single GNN model with fixed network architecture and hyperparameters allows for a low prediction error of~10%over a group of remarkably different microstructures as well as quantifying the importance of each feature in each grain of a microstructure to its *** a microstructure-graph-based GNN model,therefore,enables an accurate and interpretable prediction of the properties of polycrystalline materials.

关键词： microstructure polycrystalline prediction

Evalution of the Accuracy and Performance of Multi-GNSS(MGEX)Positioning for Long Baselines by Using Different Software

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Journal of Geodesy and Geoinformation Science 2023年第4期6卷 79-92页

作者： Atinc Pirti mehmet Ali Yücel Department of Surveying Engineering Davutpasa Yildiz Technical UniversityEsenler 34220Türkiye Department of Geomatics Engineering Canakkale Onsekiz Mart UniversityCanakkale 17100Türkiye

The Global Positioning System(GPS)is a GNSS constellation,but GNSS is not always *** is one of the GNSS constellations used around the *** GNSS constellations include GPS(US),QZSS(Japan),Beidou/BDS(China),Galileo(EU),and GLONASS(Russia).In 1999,the European Commission(EC)proposed the European Galileo satellite navigation system for the first time.A four-phase development was proposed,including public and private sector *** was intended for both civilian and government use,and is managed and controlled by civil *** is made up of 30 satellites,a number of globally distributed ground stations,and a ground control and monitoring system,all of which are extremely similar to the structure,format,and layout of *** this study,we investigate GPS/GLONASS/Galileo/Beidou/IRNSS/QZSS Navigation Satellite System integration algorithm for long baselines ranging from 1500 km to 3000 km in China,Japan and *** positioning performance with GPS/GLONASS/Galileo/BDS/IRNSS/QZSS,GPS-only,Galileo-only,GLONASS-only and BDS-only,*** compared in terms of the positioning *** improvement of positioning accuracy over long baselines can be found with GPS/GLONASS/Galileo/BDS/QZSS/IRNSS compared with that of GPS-only and that of *** obtained differences of the two baselines(Topcon Magnet Tools Software(Multi-GNSS)-(CSRS-PPP(GPS/GLONASS),(Trimble-RTX(GPS/GLONASS),(AUSPOS(GPS/GLONASS))Online Processing Software)by using GPS/GLONASS/Galileo/BDS/QZSS/IRNSS signals is between 40 cm and 111.5 cm on three days.

关键词： Multi-GNSS(MGEX) accuracy analysis improvement QZSS Beidou Galileo IRNSS

Symmetries of boundary layer equations of power-law fluids of second grade

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Acta Mechanica Sinica 2008年第6期24卷 661-670页

作者： mehmet Pakdemirli Yi■it Aksoy Muhammet Yürüsoy Chaudry Masood Khalique Department of Mechanical Engineering Celal Bayar University45140 MuradiyeManisaTurkey Technical Education Faculty Afyon Kocatepe UniversityAfyonTurkey Department of Mathematical Sciences International Institute for Symmetry Analysis and Mathematical ModelingNorth-West UniversityMafikeng CampusPrivate Bag X 2046Mmabatho 2735South Afiica

A modified power-law fluid of second grade is considered. The model is a combination of power-law and second grade fluid in which the fluid may exhibit normal stresses, shear thinning or shear thickening behaviors. The equations of motion are derived for two dimensional incompressible flows, and from which the boundary layer equations are derived. Symmetries of the boundary layer equations are found by using Lie group theory, and then group classification with respect to power-law index is performed. By using one of the symmetries, namely the scaling symmetry, the partial differential system is transformed into an ordinary differential system, which is numerically integrated under the classical boundary layer conditions. Effects of power-law index and second grade coefficient on the boundary layers are shown and solutions are contrasted with the usual second grade fluid solutions.

关键词： Power-law fluid of second grade Boundarylayers Lie group theory

Unified Treatment of Screening Coulomb and Anharmonic Oscillator Potentials in Arbitrary Dimensions

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Communications in Theoretical Physics 2006年第5期45卷 807-812页

作者： Blent Gnl Okan zer mehmet Kocak Department of Engineering Physics Faculty of Engineering University of Gaziantep 27310 Gaziantep Trkiye

A mapping is obtained relating radial screened Coulomb systems with low screening parameters to radial anharmonic oscillators in N-dimensional space. Using the formalism of supersymmetric quantum mechanics, it is show... 详细信息

关键词： supersymmetric quantum mechanics screening Coulomb N-dimensional space

Rare-earth Magnet Free Flux-switching Generator for Wind Turbines in Micro-grids:A Review

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CES Transactions on Electrical Machines and Systems 2024年第3期8卷 295-309页

作者： Tugberk Ozmen BatıEren Ergun mehmet Onur Gulbahce Nevzat Onat Vocational School of Manisa Technical Sciences Manisa 45140Turkey department of Electrical Engineering Istanbul Technical UniversityIstanbul 34469Turkey Department of Electrical and Electronics Engineering University of Manisa Celal Bayar UniversityManisa 45140Turkey

In traditional electricity generation plants,large powerful synchronous,induction,and direct current generators were *** the proliferation of microgrids focused on electricity generation from renewable energy sources in today’s power grids,studies have been conducted on different types of *** of the traditional generator architecture,generators with brushless structures,particularly those utilizing magnets for excitation,have found broad *** generators(FSGs)are innovative types owing to their robust structure,active stator design,and high power density ***,designs have typically relied on rare-earth element ***-earth magnets possess negative characteristics such as price uncertainty,the potential risk of scarcity in the future,and limited geographical production,leading to research on FSGs that do not depend on rare-earth *** study comprehensively examines FSGs that do not use rare-earth element *** study delves into the usage areas,operational mechanisms,structural diversities,and counterparts in the literature of these generators.

关键词： Flux-switching Generator Micro-grid Wind energy

Newly modified method and its application to the coupled Boussinesq equation in ocean engineering with its linear stability analysis

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Communications in Theoretical Physics 2020年第11期72卷 11-18页

作者： Hajar Farhan Ismael Hasan Bulut Haci mehmet Baskonus Wei Gao Department of Mathematics Faculty of ScienceUniversity of ZakhoZakhoIraq Department of Mathematics Faculty of ScienceFirat UniversityElazigTurkey Department of Mathematics and Science Education Harran UniversitySanliurfaTurkey School of Information Science and Technology Yunnan Normal UniversityKunmingChina

Investigating the dynamic characteristics of nonlinear models that appear in ocean science plays an important role in our *** this research,we study some features of the paired Boussinesq equation that appears for two-layered fluid flow in the shallow water *** extend the modified expansion function method(MEFM)to obtain abundant solutions,as well as to find new *** using this newly modified method one can obtain novel and more analytic solutions comparing to ***,numerical solutions via the Adomian decomposition scheme are discussed and favorable comparisons with analytical solutions have been done with an outstanding ***,the instability modulation of the governing equations are explored through the linear stability analysis *** new solutions satisfy the main coupled equation after they have been put into the governing equations.

关键词： newly modified method coupled Boussinesq equation linear stability analysis Adomian decomposition method