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Formation of air-entraining vortices at horizontal intakes without approach flow induced circulation

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Journal of Hydrodynamics 2016年第1期28卷 102-113页

作者： mustafa GOGUS Mete KOKEN Ali BAYKARA Civil Engineering Department Middle East Technical University

The aim of this experimental study is to investigate the effects of hydraulic parameters on the formation of air-entraining vortices at horizontal intake structures without approach flow induced circulation. Six intake pipes of different diameters were tested in the study. The intake pipe to be tested was horizontally mounted to the front side of a large reservoir and then for a wide range of discharges experiments were conducted and critical submergences were detected with adjustable approach channel sidewalls. Empirical equations were derived for the dimensionless critical submergence as a function of the relevant dimensionless parameters. Available data is also checked for the possible scale effect. Then, these obtained equations were compared with the similar ones in the literature which showed a quite good agreement.

关键词： air-entraining vortex horizontal intakes model scale effect sidewall clearance vortex

Phase diagrams in mixed spin-3/2 and spin-2 Ising system with two alternative layers within the effective-field theory

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Chinese Physics B 2011年第6期20卷 112-124页

作者： Bayram Deviren Yasin Polat mustafa Keskin Department of Physics Nevsehir University Institute of Science Erciyes University Department of Physics Erciyes University

The phase diagrams in the mixed spin-3/2 and spin-2 Ising system with two alternative layers on a honeycomb lattice are investigated and discussed by the use of the effective-field theory with correlations. The interaction of the nearest-neighbour spins of each layer is taken to be positive （ferromagnetic interaction） and the interaction of the adjacent spins of the nearest-neighbour layers is considered to be either positive or negative （ferromagnetic or antiferromagnetic interaction）. The temperature dependence of the layer magnetizations of the system is examined to characterize the nature （continuous or discontinuous） of the phase transitions and obtain the phase transition temperatures. The system exhibits both second- and first-order phase transitions besides triple point （TP）, critical end point （E）, multicritical point （A）, isolated critical point （C） and reentrant behaviour depending on the interaction parameters. We have also studied the temperature dependence of the total magnetization to find the compensation points, as well as to determine the type of behaviour, and N-type behaviour in Neel classification nomenclature existing in the system. The phase diagrams are constructed in eight different planes and it is found that the system also presents the compensation phenomena depending on the sign of the bilinear exchange interactions.

关键词： mixed spin-3/2 and spin-2 Ising system effective-field theory compensation phenomena phase diagrams

Skin lesion classification system using a Knearest neighbor algorithm

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Visual Computing for Industry,Biomedicine,and Art 2022年第1期5卷 78-87页

作者： mustafa Qays Hatem Renewable Energy Department Technical Institute of BaqubahMiddle Technical UniversityDyala 32001Iraq

One of the most critical steps in medical health is the proper diagnosis of the *** is one of the most volatile and challenging fields in terms of *** often require further testing,review of the patient’s history,and other data to ensure a proper ***,finding a method that can guarantee a proper trusted diagnosis quickly is *** approaches have been developed over the years to facilitate the diagnosis based on machine ***,the developed systems lack certain properties,such as high *** study proposes a system developed in MATLAB that can identify skin lesions and classify them as normal or *** classification process is effectuated by implementing the K-nearest neighbor(KNN)approach to differentiate between normal skin and malignant skin lesions that imply *** is used because it is time efficient and promises highly accurate *** accuracy of the system reached 98%in classifying skin lesions.

关键词： Machine learning Skin disease K-nearest neighbor Skin detection MATLAB Graphical user interface

Microgrid Energy Management: Classification, Review and Challenges

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CSEE Journal of Power and Energy Systems 2023年第4期9卷 1425-1438页

作者： Lejla Ahmethodzic mustafa Music Senad Huseinbegovic the Faculty of electrical engineering University of SarajevoBiHBosnia and Herzegovina. Public Electric Utility Elektroprivreda SarajevoBiHand Faculty of electrical engineeringUniversity of SarajevoBosnia and Herzegovina

Microgrids provide a way to introduce ecologically acceptable energy production to the power *** main chal-lenges with microgrids are overall control,as well as maintaining safe,reliable and economical *** explore implementing these possibilities,but in rapidly expanding areas of research there is always a need to review what has been done so far and give guidelines to new researchers on topics in need of more *** paper offers an extensive literature review of the energy management part of the microgrid control *** on extensive literature research,the authors of this article offer their view on energy management system *** through centralized and decentralized structure is *** most popular research topic is the optimization of energy *** paper offers a new perspective on the classification of optimization methods used for microgrid energy management,listing and sorting many problem related *** microgrid is not an assembly of independent elements but rather a coordinated system of intertwined *** elements of microgrid functioning,like energy storage systems,demand side *** vehicles are also explored in this paper,giving the current state of their research through *** Terms-Demand side management,electric vehicles,energy management system,energy storage systems,microgrid,operation and control.

关键词： Demand side management electric vehicles energy management system energy storage systems microgrid operation and control.

Singular solitons and other solutions to a couple of nonlinear wave equations

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Chinese Physics B 2013年第6期22卷 115-121页

作者： mustafa Inc Esma Ulutas Anjan Biswas Firat University Department of Mathematics23119 ElazgTürkiye Bitlis Eren University Deparment of StatisticBitlis Türkiye Department of Mathematical Sciences Delaware State UniversityDover DE 19901-2277 USA

This paper addresses the extended （G′/G）-expansion method and applies it to a couple of nonlinear wave equations. These equations are modified the Benjamin-Bona-Mahoney equation and the Boussinesq equation. This extended method reveals several solutions to these equations. Additionally, the singular soliton solutions are revealed, for these two equations, with the aid of the ansatz method.

关键词： (G′/G)-expansion method travelling wave solutions singular soliton mBBM and Boussinesqequations

Kinetic Ising model in a time-dependent oscillating external magnetic field:effective-field theory

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Chinese Physics B 2010年第5期19卷 187-194页

作者： Bayram Deviren Osman Canko mustafa Keskin Institute of Science Erciyes University38039 KayseriTurkey Department of Physics Nevsehir University50300 NevsehirTurkey Department of Physics Erciyes University38039 KayseriTurkey

Recently, Shiet al. [2008 Phys. Left. A 372 5922] have studied the dynamical response of the kinetic Ising model in the presence of a sinusoidal oscillating field and presented the dynamic phase diagrams by using an effective-field theory （EFT） and a mean-field theory （MFT）. The MFT results are in conflict with those of the earlier work of Tome and de Oliveira, [1990 Phys. Rev. A 41 4251]. We calculate the dynamic phase diagrams and find that our results are similar to those of the earlier work of Tome and de Oliveira; hence the dynamic phase diagrams calculated by Shiet al. are incomplete within both theories, except the low values of frequencies for the MFT calculation. We also investigate the influence of external field frequency （w） and static external field amplitude （h0） for both MFT and EFT calculations. We find that the behaviour of the system strongly depends on the values of w and h0.

关键词： kinetic Ising model effective-field theory mean-field theory

Organization：A new focus on mine safety improvement in a complex operational and business environment

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International Journal of Mining Science and Technology 2017年第4期27卷 617-625页

作者： Komljenovic Dragan Loiselle Georges Kumral mustafa Institut de Recherche d'Hydro-Quebec (IREQ) 1800 boul. Lionel-Boulet Varennes J3X 1S1 Canada Hydro-Quebec Trans Energie 5250 Armand-Frappier St-Hubert J3Z 1G3 Canada Department of Mining and Materials Engineering McGill University Montreal H3A OE8 Canada

The daily operations in the mining industry are still a significant source of risk with regard to occupational safety and health(OS & H). Various research studies and statistical data world-wide show that the number of serious injuries and fatalities still remains high despite substantial efforts the industry has put in recent years in decreasing those numbers. This paper argues that the next level of safety performance will have to consider a transition from coping solely with workplace dangers, to a more systemic model taking organizational risks in consideration. In this aspect, lessons learned from the nuclear industry may be useful, as organizational learning processes are believed to be more universal than the technologies in which they are used. With the notable exception of major accidents, organizational performance has not received all the attention it deserves. A key element for reaching the next level of performance is to include organizational factors in low level events analyses, and approach the management as a risk control system. These factors will then appear not only in the event analysis,but in supervision activities, audits, change management and the like. Many recent event analyses across various industries have shown that organizational factors play a key role in creating conditions for triggering major accidents(aviation, railway transportation, nuclear industry, oil exploitation, mining, etc.).In this paper, a perspective that may be used in supervisory activities, self-assessments and minor events investigations, is presented. When ingrained in an organizational culture, such perspective has the highest potential for continuous safety improvement.

关键词： Occupational safety and health Safety culture Organizational performance Risk analysis and management

Thermal comfort in classrooms considering a traditional wind tower in Trabzon through simulation

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Building Simulation 2022年第3期15卷 401-418页

作者： Rova Rabeharivelo mustafa Kavraz Cemalettin Aygün Department of Architecture Karadeniz Technical UniversityTrabzonTurkey Department of Technical Engineering Karadeniz Technical UniversityTrabzonTurkey

The spaces must be designed in accordance with certain design principles for people to feel *** accordance with that,building ventilation is particularly important during hot periods to ensure thermal *** this study,the effect of ventilation realized using a wind tower on the thermal quality of a classroom was *** the study,two popular models(unidirectional and multidirectional wind tower)were studied,and the model that provided more ergonomic ventilation to sitting users based on climate conditions of the province of Trabzon(Turkey)during the month of August was *** more efficient model was studied *** dimensional changes in width,height,and shelf height were applied to it to find a model that provided more comfort for the used thermal *** models were modelled and simulated using ANSYS *** distributions were generated to ease the interpretation of the *** the calculated average wind speeds in different regions in the classroom,the thermal sensation in the space was ***,the thermal perception of users of the retained model was evaluated by entering thermal comfort parameter values calculated for the relevant region into the CBE thermal comfort tool available *** change in the dimensional features of the wind tower had an impact on wind tower *** provided by wind towers under the thermal conditions of Trabzon in August often caused thermal discomfort.

关键词： wind tower natural ventilation thermal comfort classroom Trabzon

Corrosion behavior of tempered dual-phase steel embedded in concrete

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International Journal of Minerals,Metallurgy and Materials 2009年第1期16卷 43-50页

作者： Oguzhan Kelestemur mustafa Aksoy Servet Ylldlz Department of Construction Education Firat University Department of Metallurgy and Materials Engineering Firat University

Dual-phase （DP） steels with different martensite contents were obtained by appropriate heat treatment of an SAE1010 structural carbon steel, which was cheap and widely used in the construction industry. The corrosion behavior of DP steels in concrete was investigated under various tempering conditions. Intercritical annealing heat treatment was applied to the reinforcing steel to obtain DP steels with different contents of martensite. These DP steels were tempered at 200, 300, and 400℃ for 45 min and then cooled to room temperature. Corrosion experiments were conducted in two stages. In the first stage, the corrosion potential of DP steels embedded in concrete was measured every day for a period of 30 d based on the ASTM C 876 standard. In the second stage, the anodic and cathodic polarization values of these steels were obtained and subsequently the corrosion currents were determined with the aid of cathodic polarization curves. It was observed that the amount of second phase had a definite effect on the corrosion behavior of the DP steel embedded in concrete. As a result of this study, it is found that the corrosion rate of the DP steel increases with an increase in the amount of martensite.

关键词： dual-phase steel corrosion tempering treatment martensite concrete