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Investigation of micro-scale shear response of sand–rubber granule mixture in terms of particle shape and grain scale deformability effects

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Particuology 2024年第7期90卷 452-469页

作者： Abdulmuttalip Ari suat Akbulut Department of Civil Engineering Yildiz Technical UniversityIstanbul34220Turkey

In this study,the effects of particle shape of rigid sand and soft rubber materials on macro-scale shear response were reasoned based on micro-scale *** this purpose,first,the shape properties of three different sand and two different rubber samples were quantified using image processing techniques,and the contact model parameters were calibrated through physical *** direct shear test was simulated in a two-dimensional discrete element software with realistic particle *** soft nature of rubber particles was reflected using body-centered cubic packing with a linear-parallel bond contact *** a result,coordination number,distribution of contact forces(i.e.,strong contact,and fabric anisotropy),and contact sliding were derived by the numerical *** has been observed that the particle shape leads to distinctive micro-scale responses due to the variations in the stiffness of the contacts.

关键词： Particle shape Sand Rubber Shear response Micro-scale response Discrete element method

Study on Threshold Patterns with Varying Illumination Using 1.3m Imaging System

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Intelligent Information Management 2010年第1期2卷 21-25页

作者： Vinesh SUKUMAR Herbert L. HESS Ken V. NOREN Greg DONOHOE suat ay 不详

Human eye can generally distinguish objects from each other or from their background, if the difference in luminance or color is large. This paper concentrates on the luminance portion and makes an attempt to characterize perception detection to varying contrast which is explained in contrast sensitivity terms. This is accomplished using sinusoidal test patterns. Influence of illumination on perception threshold is also shown in this paper. Practical measurements are done using a calibrated monitor with image capture accomplished with a 1/4' 1.3M camera module system.

关键词： perception threshold contrast sensitivity

On the existence and uniqueness of a nonlinear q-difference boundary value problem of fractional order

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International Journal of Modeling, Simulation, and Scientific Computing 2022年第1期13卷 265-284页

作者： Zouaoui Bekri Vedat suat Erturk Pushpendra Kumar Laboratory of Fundamental and Applied Mathematics University of Oran 1 Ahmed Ben Bella Es-senia31000 OranAlgeria Department of Mathematics Ondokuz Mayis University Atakum-55200 SamsunTurkey Department of Mathematics and Statistics School of Basic and Applied Sciences Central University of Punjab Bathinda Punjab-151001India

In this research collection,we estimate the existence of the unique solution for the boundary value problem of nonlinear fractional q-difference equation having the given form c D^(ζ)_(q) v(t)−h(t,v(t))=0,0≤t≤1,α_(1)v(0)+β_(1)D_(q)v(0)=v(η1),α_(2)v(1)−β_(2)D_(q)v(1)=v(η2),where 1ay–Schauder nonlinear alternative to vindicate the unique solution existence of the given *** the applications,some examples are solved to justify our outcomes.

关键词： Fractional q-derivative principle of Banach contraction Leary-Schauder non-linear alternative existence and uniqueness boundary value problem

On Modules Satisfying S-Noetherian Spectrum Condition

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Communications in Mathematics and Statistics 2023年第3期11卷 649-662页

作者： MehmetÖzen Osama A.Naji Ünsal Tekir suat Koç Department of Mathematics Sakarya UniversitySakaryaTurkey Department of Mathematics Marmara UniversityIstanbulTurkey

Let R be a commutative ring having nonzero identity and M be a unital *** that S⊆R is a multiplicatively closed subset of ***,M satisﬁes S-Noetherian spectrum condition if for each submodule N of M,there exist s∈S and aﬁnitely generated submodule F⊆N such that sN⊆radM(F),where radM(F)is the prime radical of F in the sense(McCasland and Moore in Commun Algebra 19(5):1327–1341,1991).Besides giving many properties and characterizations of S-Noetherian spectrum condition,we prove an analogous result to Cohen’s theorem for modules satisfying S-Noetherian spectrum ***,we characterize modules having Noetherian spectrum in terms of modules satisfying the S-Noetherian spectrum condition.

关键词： Noetherian modules S-Noetherian modules Noetherian spectrum S-Noetherian spectrum condition

Study of Metal and Ceramic Thermionic Vacuum arc Discharges

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Plasma Science and Technology 2007年第3期9卷 280-283页

作者： Tamer AKAN Serdar DEMIRKOL Naci EKEM suat PAT Geavit MUSA Eskisehir Osmangazi University Physics DepartmentEskisehirTurkey National Institute for Laser Plasma and Radiation PhysicsBucharestRomania

The thermionic vacuum arc （TVA） is a new type of plasma source, which generates a pure metal and ceramic vapour plasma containing ions with a directed energy. TVA discharges can be ignited in high vacuum conditions between a heated cathode （electron gun） and an anode （tungsten crucible） containing the material. The accelerated electron beam, incident on the anode, heats the crucible, together with its contents, to a high temperature. After establishing a steadystate density of the evaporating anode material atoms, and when the voltage applied is high enough, a bright discharge is ignited between the electrodes. We generated silver and Al2O3 TVA discharges in order to compare the metal and ceramic TVA discharges. The electrical and optical characteristics of silver and Al2O3 TVA discharges were analysed. The TVA is also a new technique for the deposition of thin films. The film condenses on the sample from the plasma state of the vapour phase of the anode material, generated by a TVA. We deposited silver and Al2O3 thin films onto an aluminium substrate layer-by-layer using their TVA discharges, and produced micro and/or nano-layer Ag-Al2O3 composite samples. The composite samples using scanning electron microscopy was also analysed.

关键词： plasma vacuum arc discharge silver Al2O3 (alumina) composite

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

Phase control of ellipsometric interferometer for nanometric positioning system

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Science China(Technological Sciences) 2011年第12期54卷 3424-3430页

作者： XU SuAn CHASSAGNE Luc TOPCU suat ZHONG ShaoJun HUANG YanYan College of Mechanical and Electrical Engineering China Jiliang University Hangzhou 310018 China LISV University of Versailles Saint-Quentin Versailles cedex 78035 France

Development in industry is asking for improved resolution and higher accuracy in dimensional metrology. In this paper,we proposed a control displacement method based on a polarization ellipsometirc interferometer and phase-locked loop technique. The proposed principle was set up. The experimental results of step and step displacements with a step value of 5 nm were presented. We also analyzed the resolution,the potential minimal displacement of the established system. The results show that the position error induced by the ellipticty deviation of the light beam becomes negligible thanks to our signal processing circuit with high-order filter. This method could be useful for many applications in nano dimensional metrology and semiconductor industry.

关键词： ellipsometric interferometer phase locked loop nanometric position control displacement monitoring

The Multi-Step Differential Transform Method and Its Application to Determine the Solutions of Non-Linear Oscillators

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Advances in Applied Mathematics and Mechanics 2012年第4期4卷 422-438页

作者： Vedat suat Erturk Zaid M.Odibat Shaher Momani Department of Mathematics Faculty of Arts and SciencesOndokuz Mayis University55139SamsunTurkey Prince Abdullah Bin Ghazi Faculty of Science and IT Al-Balqa Applied UniversityAl-Salt 19117Jordan The University of Jordan Faculty of ScienceDepartment of MathermaticsAmman 1194Jordan

In this paper,a reliable algorithm based on an adaptation of the standard differential transform method is presented,which is the multi-step differential transform method(MSDTM).The solutions of non-linear oscillators were obtained by *** comparisons between the MSDTM and the classical fourthorder Runge-Kutta method(RK4)reveal that the proposed technique is a promising tool to solve non-linear oscillators.

关键词： Non-linear oscillatory systems differential transform method numerical solution

A Study on the Nonlinear Caputo-Type Snakebite Envenoming Model with Memory

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Computer Modeling in Engineering & Sciences 2023年第9期136卷 2487-2506页

作者： Pushpendra Kumar Vedat suat Erturk V.Govindaraj Dumitru Baleanu Department of Mathematics National Institute of Technology PuducherryKaraikal609609India Department of Mathematics Faculty of Arts and SciencesOndokuz Mayis UniversityAtakumSamsun55200Turkey Department of Mathematics Cankaya UniversityAnkara06530Turkey Institute of Space Sciences MagureleBucharestR76900Romania Department of Computer Science and Mathematics Lebanese American UniversityBeirut11022801Lebanon

In this article,we introduce a nonlinear Caputo-type snakebite envenoming model with *** well-known Caputo fractional derivative is used to generalize the previously presented integer-order model into a fractionalorder *** numerical solution of the model is derived from a novel implementation of a finite-difference predictor-corrector(L1-PC)scheme with error estimation and stability *** proof of the existence and positivity of the solution is given by using the fixed point *** the necessary simulations,we justify that the first-time implementation of the proposedmethod on an epidemicmodel shows that the scheme is fully suitable and time-efficient for solving epidemic *** work aims to show the novel application of the given scheme as well as to check how the proposed snakebite envenoming model behaves in the presence of the Caputo fractional derivative,including memory effects.

关键词： Mathematical model Caputo fractional derivative L1-predictor-corrector method error estimation stability graphical simulations