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Chinese Physics B 2013年第12期22卷 160-167页

作者： mehmet Ertas Mustafa Keskin Department of Physics Erciyes University

Using the mean-field theory and Glauber-type stochastic dynamics, we study the dynamic magnetic properties of the mixed spin （2, 5/2） Ising system for the antiferromagnetic/antiferromagnetic （AFM/AFM） interactions on the bilayer square lattice under a time varying （sinusoidal） magnetic field. The time dependence of average magnetizations and the thermal variation of the dynamic magnetizations are examined to calculate the dynamic phase diagrams. The dynamic phase diagrams are presented in the reduced temperature and magnetic field amplitude plane and the effects of interlayer coupling interaction on the critical behavior of the system are investigated. We also investigate the influence of the frequency and find that the system displays richer dynamic critical behavior for higher values of frequency than that of the lower values of it. We perform a comparison with the ferromagnetic/ferromagnetic （FM/FM） and AFM/FM interactions in order to see the effects of AFM/AFM interaction and observe that the system displays richer and more interesting dynamic critical behaviors for the AFM/AFM interaction than those for the FM/FM and AFM/FM interactions.

关键词： dynamic magnetic behavior of a bilayer Ising system mixed spins glauber-type stochastic dynamics antiferromagnetic/antiferromagnetic interactions

A novel PV sub-module-level power-balancing topology for maximum power point tracking under partial shading and mismatch conditions

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Frontiers of Information Technology & Electronic Engineering 2016年第12期17卷 1388-1396页

作者： Mustafa GOKDAG mehmet AKBABA Department of Electrical-Electronics Engineering Karabuk University Karabuk 78050 Turkey Department of Computer Engineering Karabuk University Karabuk 78050 Turkey

Partial shading and mismatch conditions among the series-connected modules/sub-modules suffer from a nonconvex power curve with multiple local maxima and decreased peak power for the whole string. Energy transfer between the sub-modules brings them to the same operating voltage, and this collective operation produces a convex power curve, which results in increased peak power for the string. The proposed topology benefits from the switched-capacitor （SC） converter concept and is an application for sub-module-level power balancing with some novelties, including stopping the switching in absence of shading, string-level extension, and a reduced number of power electronics components as compared to those in the literature. Reduction in the number of power electronics components is realized by the fact that two sub-modules share one SC converter. This leads to reduced power electronics losses as well as less cost and volume of the converter circuit. Insertion loss analysis of the topology is presented. The proposed topology is simulated in the PSpice environment, and a prototype is built for experimental verification. Both simulation and experimental results confirm the loss analysis. This proves that with the proposed topology it is possible to extract almost all the power available on the partially shaded string and transfer it to the load side.

关键词： Sub-module-level maximum power point tracking (MPPT) Differential power processing (DPP) Distributed power converters Switched-capacitor (SC) converters

Occupant friendly seismic retrofit by concrete plates

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2013年第11期14卷 789-804页

作者： mehmet BARAN Merve AKTAS Department of Civil Engineering Engineering and Natural Sciences Faculty Yildirim Beyazit University06110 Ulus Ankara Turkey Institute of Science Kirikkale UniversityYahsihan 71450 Kirikkale Turkey

An innovative occupant friendly retrofitting technique has been developed for reinforced concrete(RC) building structures with hollow brick infill walls used as partition walls which constitute the major portion of the existing building stock in Turkey. The idea is to convert the existing hollow brick infill wall into a load carrying system acting as a cast-in-place RC wall by reinforcing it with relatively thin concrete plates bonded to the mortar coated infill wall by use of tile adhesive and fixed by 6(6 mm diameter) bolts. Test parameters were the shape and thickness of the plates, presence of reinforcement in plates, number and arrangement of 6 bolts. It was observed that lateral strength, stiffness, energy dissipation capacity, and ductility of the strengthened infill walls were improved and behaviour was enhanced by the proposed technique. Plates with two different basic shapes were used to strengthen the test specimens.

关键词： Reinforced concrete(RC) Strengthening Concrete plate Lateral strength Stiffness Hollow brick infills Reversed-cyclic lateral loads

Examination of Correlation between Histidine and Cadmium Absorption by Eleagnus angustifolia L.,Vitisvinifera *** Nerium oleander *** HPLC-MS and ICP-MS

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光谱学与光谱分析 2016年第2期36卷 588-592页

作者： Sukran Akkus Ozen mehmet Yaman Firat University Faculty of ScienceDepartment of Chemistry

In this study,HPLC-MS and ICP-MS methods wereused for the determination of histidine and cadmiumin Eleagnusangustifolia L.,Vitisvinifera *** Nerium oleander *** taken from industrial area including Gaziantep and Bursa *** histidine determination by HPLC-MS,flow rate of mobile phase,fragmentor potential,injection volume and column temperature were optimized as 0.2mL·min^(-1),70V,15μL and 20℃,*** extraction of histidine from plants,distilled water was used by applying on 90℃and *** concentrations(as mg·kg^(-1))of histidine were found to be in range of 8~22for Eleagnusangustifolia L.,10~33for Vitisvinifera *** 6~11for Nerium oleander *** concentrations of cadmium were found to be in ranges of 6~21μg·kg^(-1) for Vitisvinifera L.15~110μg·kg^(-1) for Eleagnusangustifolia *** 63~218μg·kg^(-1) for Nerium oleander L.

关键词： Histidine Cadmium Hyperaccumulator plants ICP-MS HPLC-MS

Investigation of effects of Cocamide Diethanolamide chemical on physical and rheological properties of bituminous binder

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Frontiers of Structural and Civil Engineering 2022年第1期16卷 99-116页

作者： Gizem KACAROGLU mehmet SALTAN Department of Civil Engineering Suleyman Demirel UniversityIsparta 32200Turkey

In this study,bituminous binder was modified with Cocamide Diethanolamide chemical,a non-ionic surfactant,and the physical and rheological properties of modified binders were *** addition,Cocamide Diethanolamide has been used for the first time to modify bituminous binder,and this situation makes the study *** binder was modified more than once with the chemical by changing modification parameters and using certain additive ratios(1%,3%,and 5%).The effects of different modification parameters and chemical additive on modified samples were investigated with conventional bitumen tests(softening point,penetration,ductility)and Superpave tests(rotational viscometer,rolling thin film oven test,pressure aging vessel,dynamic shear rheometer,bending beam rheometer).In addition,the structural characteristics of the reference binder and modified samples were examined by X-ray diffraction,Fourier Transform Infrared Spectroscopy,scanning electron microscopy,and energy dispersive X-ray *** examinations showed that Cocamide Diethanolamide softens bituminous binder and lowers processing *** addition,compared to reference binder,rutting resistances of modified bituminous binders decreased with the increase of additive ***,modification with Cocamide Diethanolamide increased the resistance to fatigue cracks and thermal cracks.

关键词： Cocamide Diethanolamide bitumen modification rheology Superpave tests

Mixture Performance of Bitumen Modified with Cocamide Diethanolamide

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Journal of Wuhan University of Technology(Materials Science) 2021年第5期36卷 706-713页

作者： Oznur Karadag mehmet Saltan Civil Engineering Department Suleyman Demirel UniversityIsparta 32040Turkey

Bituminous binders have been modified by using cocamide *** chemical material used in this study is used for the first-time on the purpose of modification of the *** addition to the conventional bitumen tests(penetration,softening point and ductility tests),adhesion and peeling tests(Vialit,Nicholson and California tests)were carried out on the bituminous binders which are modified with different ratios of cocamide *** to the results of the tests,the most appropriate additive ratio has been *** containing the reference bituminous binder and the bituminous binder modified with the most appropriate cocamide diethanolamide ratio were prepared using the superpave volumetric mix design method(SuperpaveTM).In accordance with standard method of test for resistance of compacted asphalt mixtures to moisture-induced damage(AASHTO T 283),the moisture susceptibility of prepared samples has been *** order to observe the changes in strength due to the temperature difference,prepared samples were subjected to the freeze-thawing test in accordance with standard test method for resistance of concrete to rapid freezing and thawing(ASTM C 666).

关键词： cocamide diethanolamide superpaveTM freeze-thaw cycle moisture susceptibility adhesion

Harvest optimization for sustainable agriculture:The case of tea harvest scheduling

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Artificial Intelligence in Agriculture 2023年第4期10卷 35-45页

作者： Bedirhan Sarımehmet mehmet Pınarbaşı Hacımehmet Alakaş Tamer Eren Department of Industrial Engineering Faculty of Architecture and EngineeringKırıkkale UniversityKırıkkaleTurkey

To ensure sustainability in agriculture,many optimization problems need to be *** important one of them is harvest scheduling *** this study,the harvest scheduling problem for the tea is *** tea harvest problem includes the creating a harvest schedule by considering the farmers'quotas under the purchase location and factory *** harvesting is carried out in cooperation with the *** man-agement is interested in using its ***,the factory capacity,purchase location capacities and number of expeditions should be considered during the harvesting *** the farmer's side is examined,it is seen that the real professions of farmers are *** harvest days,farmers often cannot attend to their primary *** the harvest day preferences of farmers in creating the harvest schedule are of great importance for sustainability in *** different mathematical models are proposed to solve this *** first model minimizes the number of weekly expeditions of factory vehicles within the factor and purchase location capacity *** second model minimizes the number of expeditions and aims to comply with the preferences of the farmers as much as possible.A sample application was performed in a region with 12 purchase locations,988 farmers,and 3392 decares of tea *** results show that the compli-ance rate of farmers to harvesting preferences could be increased from 52%to 97%,and this situation did not affect the number of expeditions of the *** result shows that considering the farmers'preferences on the harvest day will have no negative impact on the *** the contrary,it was concluded that this situation increases sustainability and encouragement in ***,the results show that models are effective for solving the problem.

关键词： Goal programming Harvest optimization Harvest scheduling Sustainable agriculture Tea

Wear and mechanical properties of carburized AISI 8620 steel produced by powder metallurgy

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International Journal of Minerals,Metallurgy and Materials 2021年第3期28卷 430-439页

作者： mehmet Akif Erden Fatih Aydın Department of Biomedical Engineering Karabuk UniversityKarabuk 78050Turkey Department of Metallurgical and Materials Engineering Karabuk UniversityKarabuk 78050Turkey

The effect of carburization on the tensile strength and wear resistance of AISI 8620 steel produced via powder metallurgy was *** 1 and 2(with 0.2wt%C and 0.25wt%C,respectively)were first pressed at 700 MPa and then sintered at 1300,1400,or 1500℃for 1 *** ideal sintering temperature of 1400℃was ***,Alloys 1 and 2 sintered at 1400℃were carburized at 925℃for 4 *** microstructure characterization of alloys was performed via optical microscopy and scanning electron *** mechanical and wear behavior of carburized and noncarburized alloys were investigated via hardness,tensile,and wear *** carburization,the ultimate tensile strength of Alloys 1 and 2 increased to 134.4%and 138.1%,***,the elongation rate of Alloys 1 and 2 decreased to 62.6%and 64.7%,*** wear depth values of Alloy 2 under noncarburized and carburized conditions and a load of 30 N were 231.2 and 100.1μm,*** wear changed to abrasive wear when the load transitioned from 15 to 30 N.

关键词： powder metallurgy steels carburization microstructure wear mechanical properties

Investigation of the compressibility and sinterabilty of AZ91 powder production and particle production by gas atomisation method

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Journal of Magnesium and Alloys 2019年第3期7卷 400-413页

作者： mehmet Akkas Mustafa Boz Faculty of Engineering and Architecture Department of Mechanical EngineeringKastamonu UniversityTurkey Faculty of Technology Department of Manufacturing EngineeringKarabiik UniversityKarabiikTurkey

This study intends to determine the pressability and sinterability of AZ91 powder production by gas atomisation method and that of the produced powder for partial ***,first,a gas atomisation unit has been designed and manufactured in the laboratories of the Karabiik University,Department of Manufacturing *** powder production has been achieved at a temperature of 795℃,with nozzle diameters of 2 and 4 mm and four different gas pressures(5,15,25,35 bars).Argon gas has been used for atomisation and as a protective gas *** electron microscope(SEM)is used to determine the shape of the produced AZ91 powder,and a laser particle size analyzer is used to analyze the powder ***,a microhardness(HV0.025)measurement has been conducted to determine the hardness of the produced *** achieve a homogeneous distribution,the produced powders are mixed in a three-dimensional moving turbulator for 30 *** powders have been pressed at 300,400,500 and 600 MPa and have been sintered at 500℃,550℃and 600℃.Additionally,the density values have been determined before and after sintering of the *** images have been obtained from the fractured surfaces of the samples before and after *** and EDX analyses have been performed to determine the chemical ***,microhardness(HV0.5)is obtained from the pressure surfaces of the samples to determine the effects of the pressing pressure and the sintering temperature on the *** a result of the experimental studies,it has been observed that the powder size decreases with the increase in gas pressure and that the powder shape generally changes from ligament and complex shape to droplet and spherical *** the XRD,XRF and EDX results,it has been determined that the structure comprises an a phase(Mg main matrix)and Mg17Al12 interphase,which isβphase,and very small amounts of MgO have been *** hardness of the produced powders increas

关键词： Gas atomisation AZ91 alloy powder Gas pressure Nozzle diameter Pressing Sintering

RULES-IT： incremental transfer learning with RULES family

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Frontiers of Computer Science 2014年第4期8卷 537-562页

作者： Hebah ELGIBREEN mehmet Sabih AKSOY Information Technology Department College of Computer and Information Sciences King Saud University Riyadh 11415 Saudi Arabia Information Sysytem Department College of Computer and Information Sciences King Saud University Riyadh 11543 Saudi Arabia

In today＇s world of excessive development in technologies, sustainability and adaptability of computer applications is a challenge, and future prediction became significant. Therefore, strong artificial intelligence （AI） became important and, thus, statistical machine learning （ML） methods were applied to serve it. These methods are very difficult to understand, and they predict the future without showing how. However, understanding of how machines make their decision is also important, especially in information system domain. Consequently, incremental covering algorithms （CA） can be used to produce simple rules to make difficult decisions. Nevertheless, even though using simple CA as the base of strong AI agent would be a novel idea but doing so with the methods available in CA is not possible. It was found that having to accurately update the discovered rules based on new information in CA is a challenge and needs extra attention. In specific, incomplete data with missing classes is inappropriately considered, whereby the speed and data size was also a concern, and future none existing classes were neglected. Consequently, this paper will introduce a novel algorithm called RULES-IT, in order to solve the problems of incremental CA and introduce it into strong AI. This algorithm is the first incremental algorithm in its family, and CA as a whole, that transfer rules of different domains to improve the performance, generalize the induction, take advantage of past experience in different domain, and make the learner more intelligent. It is also the first to introduce intelligent aspectsinto incremental CA, including consciousness, subjective emotions, awareness, and adjustment. Furthermore, all decisions made can be understood due to the simple representation of repository as rules. Finally, RULES-IT performance will be benchmarked with six different methods and compared with its predecessors to see the effect of transferring rules in the learning process, and to pro

关键词： incremental learning transfer learning covering algorithms RULES family inductive learning