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Gazi University Journal of Science Part A: Engineering and Innovation最新文献

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Identities for a Special Finite Sum Related to the Dedekind Sums and Fibonacci Numbers 一类与Dedekind和和斐波那契数有关的特殊有限和的恒等式
Gazi University Journal of Science Part A: Engineering and Innovation Pub Date : 2023-06-27 DOI: 10.54287/gujsa.1280707
Elif Çeti̇n
{"title":"Identities for a Special Finite Sum Related to the Dedekind Sums and Fibonacci Numbers","authors":"Elif Çeti̇n","doi":"10.54287/gujsa.1280707","DOIUrl":"https://doi.org/10.54287/gujsa.1280707","url":null,"abstract":"The origin of this article is to achieve original equations related to the special finite sum C(μ,β;1), which is connected with Dedekind, Hardy, Simsek, and many other finite sums. By using the analytic properties of this sum, many useful identities are established between the C(μ,β;1) sum and other well-known finite sums. Through the use of these identities, the reciprocity law of this sum is obtained. Furthermore, another reciprocity law of the sum C(μ,β;1) is presented for μ and β are particular Fibonacci numbers. This remarkable result establishes a connection between number theory and analysis.","PeriodicalId":134301,"journal":{"name":"Gazi University Journal of Science Part A: Engineering and Innovation","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130082097","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Effect of Wall Stiffness on Excavation-Induced Horizontal Deformations in Stiff-Hard Clays 墙体刚度对刚硬黏土开挖水平变形的影响
Gazi University Journal of Science Part A: Engineering and Innovation Pub Date : 2023-06-27 DOI: 10.54287/gujsa.1244790
Gamze Üçdemi̇r, S. Akbas
{"title":"Effect of Wall Stiffness on Excavation-Induced Horizontal Deformations in Stiff-Hard Clays","authors":"Gamze Üçdemi̇r, S. Akbas","doi":"10.54287/gujsa.1244790","DOIUrl":"https://doi.org/10.54287/gujsa.1244790","url":null,"abstract":"Excavation-induced ground movements are affected by the stiffness of the support system as well as the soil properties. Displacement estimations of deep excavations are generally made using the finite element method (FEM). However, the accuracy and reliability of the results obtained from the finite element calculations will change significantly in proportion with the quality of the parameters employed in the program, thus, the use of probabilistic analysis that considers soil variability’s impact has become a popular approach in recent studies. Based on these considerations, this study aims to investigate the influence of wall bending stiffness on excavation-induced lateral displacements for deep excavations in stiff to hard clays, and provide a practical methodology to be used in preliminary design. For this purpose, finite element analyses were carried out using various practically achievable support system stiffness values and soil parameters. Considering the inherent variability of the soil, effective stress friction angle and effective cohesion of the soil were randomly generated by Monte Carlo simulations to be used in the finite element analyses. The performance of the analyses was evaluated using results from 22 case histories from deep excavations in stiff-hard clays. The results indicate that, lateral movement in excavations in stiff-hard clays is minimally affected by the stiffness of the wall. Soil variability was found to have a significant impact on the outcome of Monte Carlo simulations, resulting in a wide range of normalized maximum lateral deformations for a given wall stiffness. A new stiffness factor has been proposed that incorporates the horizontal spacing of the support elements, which is capable of covering a wider range of excavation support system types, thus enhancing the accuracy of the analyses.","PeriodicalId":134301,"journal":{"name":"Gazi University Journal of Science Part A: Engineering and Innovation","volume":"72 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129253483","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Asphaltite Pyrolysis in Fluidized Bed Reactor 流化床反应器中沥青质的热解
Gazi University Journal of Science Part A: Engineering and Innovation Pub Date : 2023-06-27 DOI: 10.54287/gujsa.1256330
Samad Moghanirahimi, Hüseyin Topal
{"title":"Asphaltite Pyrolysis in Fluidized Bed Reactor","authors":"Samad Moghanirahimi, Hüseyin Topal","doi":"10.54287/gujsa.1256330","DOIUrl":"https://doi.org/10.54287/gujsa.1256330","url":null,"abstract":"In this study, the pyrolysis properties of asphaltite samples taken from Şırnak and Hakkari regions in a fluidized bed reactor under catalyst and non-catalyst conditions were determined by rapid and batch pyrolysis. Basic analysis, FTIR and XRF analyses were performed for the raw material. GC-MS analysis methods were used for liquid pyrolysis products and FTIR were used for solids. In order to acquire the condition of the highest liquid product yield in pyrolysis, several effective variables such as particle diameter, vacuum, nitrogen flow rate, temperature, raw material feed rate, catalyst type, raw material type and duration were experimented and the results were evaluated. In general, the vacuum effect has led to an increase in liquid product yield and a decrease in gas product yield. Liquid product yield increased at 700°C pyrolysis temperature in continuous feed system and 550 - 650°C in batch system. In the pyrolysis studies carried out, a maximum liquid product yield of 16.5% was achieved in the continuous fed reactor at 700°C temperature, 400 mmHg vacuum, 2 g/min feed rate and 500 µm particle size.","PeriodicalId":134301,"journal":{"name":"Gazi University Journal of Science Part A: Engineering and Innovation","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126836377","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Process Improvement Between Company Departments with the Integration of ERP and CRM Software Programs 通过ERP和CRM软件程序的集成，对公司各部门之间的流程进行改进
Gazi University Journal of Science Part A: Engineering and Innovation Pub Date : 2023-06-27 DOI: 10.54287/gujsa.1255461
Miyase ULUSOY YILMAZ, Bahar Özyörük, S. Bi̇lge Ocak
{"title":"Process Improvement Between Company Departments with the Integration of ERP and CRM Software Programs","authors":"Miyase ULUSOY YILMAZ, Bahar Özyörük, S. Bi̇lge Ocak","doi":"10.54287/gujsa.1255461","DOIUrl":"https://doi.org/10.54287/gujsa.1255461","url":null,"abstract":"This study aims to examine the processes of a company that uses Enterprise Resource Planning (ERP) and Customer Relationship Management (CRM) systems, which are known as integrated systems, and improve these processes in an enterprise that produces decorative acoustic suspended building products. The company started to use Netsis software as an ERP system years ago. Then, it purchased the LogoCRM software, which could work integrated into Netsis software, to ensure information flow between these systems easily. Since it is known that the company still experiences information flow issues between the departments although the ERP and CRM systems of the company are integrated, the study tried to minimize these deficiencies in the information flow between the production and sales & marketing departments. The problems experienced between the departments of the company that we work with were determined by the interviews with the ERP and CRM system users in the company, and the ERP-CRM software was customized to be suitable for the use of the company. A user-friendly interface has been designed in the CRM software, and by providing integration between the software, it is possible to see the stock balance information instantly in the CRM software. In addition, in the CRM software that will work integrated with ERP, a smart coding algorithm was developed to minimize errors by considering the possibility of the sales team misreading the product cards, and it was aimed to reduce user errors by minimizing the screen interventions of the users. In the study, ModelEditor was used for the improvements made in the SQL-based CRM software. With this study, communication problems between sales-marketing and production departments were reduced by providing ERP-CRM integration. As a result of the improvements made, a common language was developed between the departments, reducing the amount of faulty production, and time savings were achieved by reinforcing the cooperation between departments.","PeriodicalId":134301,"journal":{"name":"Gazi University Journal of Science Part A: Engineering and Innovation","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124976335","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Convergence Properties of a Kantorovich Type of Szász Operators Involving Negative Order Genocchi Polynomials 涉及负阶Genocchi多项式的Kantorovich型Szász算子的收敛性
Gazi University Journal of Science Part A: Engineering and Innovation Pub Date : 2023-06-27 DOI: 10.54287/gujsa.1282992
Erkan Ağyüz
{"title":"Convergence Properties of a Kantorovich Type of Szász Operators Involving Negative Order Genocchi Polynomials","authors":"Erkan Ağyüz","doi":"10.54287/gujsa.1282992","DOIUrl":"https://doi.org/10.54287/gujsa.1282992","url":null,"abstract":"The goal of this research is to construct a generalization of a Kantorovich type of Szász operators involving negative-order Genocchi polynomials. With the aid of Korovkin’s theorem, modulus of continuity, Lipschitz class, and Peetre’s K-functional the approximation properties and convergence rate of these operators are established. To illustrate how operators converge to a certain function, we present some examples.","PeriodicalId":134301,"journal":{"name":"Gazi University Journal of Science Part A: Engineering and Innovation","volume":"132 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114017767","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A Control Scheme for a Quasi-Z Source Three-Phase Inverter 一种准z源三相逆变器控制方案
Gazi University Journal of Science Part A: Engineering and Innovation Pub Date : 2023-06-27 DOI: 10.54287/gujsa.1303347
Zafer Ortatepe, Sadık Özdemir
{"title":"A Control Scheme for a Quasi-Z Source Three-Phase Inverter","authors":"Zafer Ortatepe, Sadık Özdemir","doi":"10.54287/gujsa.1303347","DOIUrl":"https://doi.org/10.54287/gujsa.1303347","url":null,"abstract":"This paper presents a novel control scheme for a three-phase quasi-z source inverter (qZSI) using a capacitor voltage and input current-based sinusoidal pulse width modulation (SPWM) technique. The proposed scheme combines the advantages of both qZSI and SPWM techniques to achieve improved performance. The SPWM technique utilizes a sinusoidal modulation signal, which is compared with a high-frequency triangular carrier wave and two shoot-through (ST) references to determine the switching states for the three-phase qZSI. The positive and negative ST references are obtained from the capacitor voltages and input current, allowing for control of the DC bus voltage and ST states of the inverter. Additionally, the proposed control scheme generates the three-phase modulation signal through decoupling control in the dq reference frame. The detailed analysis of the control scheme includes its operating principle, transient state, steady-state responses, and the effects of parameter variations. Simulation studies are conducted using MATLAB/Simulink to assess the performance of the three-phase qZSI under the proposed control scheme. The simulation results demonstrate the effectiveness of the control scheme in terms of output voltage quality, DC bus voltage control, and robustness against reference variations. Overall, the proposed capacitor voltage and input current-based SPWM control scheme for the three-phase qZSI shows promising performance improvements and robustness, as confirmed through comprehensive simulation studies.","PeriodicalId":134301,"journal":{"name":"Gazi University Journal of Science Part A: Engineering and Innovation","volume":"99 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115532353","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The Investigation of CO2 Gas Sensing Performance of ZnO Nanorods Growth on RF Sputtered Seed Layer ZnO纳米棒在射频溅射种子层上生长的CO2气敏性能研究
Gazi University Journal of Science Part A: Engineering and Innovation Pub Date : 2023-06-27 DOI: 10.54287/gujsa.1302064
F. Bulut, Ö. Öztürk, S. Acar
{"title":"The Investigation of CO2 Gas Sensing Performance of ZnO Nanorods Growth on RF Sputtered Seed Layer","authors":"F. Bulut, Ö. Öztürk, S. Acar","doi":"10.54287/gujsa.1302064","DOIUrl":"https://doi.org/10.54287/gujsa.1302064","url":null,"abstract":"In this study, one-dimensional ZnO nanorod structures with different ratios of nickel doping were produced using the hydrothermal method. The presence of nickel doping in different ratios caused variations in the fundamental characteristics of the nanorods that grew on the RF sputtered seed layer, such as crystallinity quality, morphology, diameter of the nanorods, band gap energy, resistance of the sample, and CO2 gas sensing. Produced samples were found to form like hexagonal rods and crystallize in a wurtzite structure, and the ratio of nickel doping improved the crystallin quality and the morphology of sample surface. This study showed that the 5% nickel doped sample provided the most effective results in sensing CO2 gas at different concentrations. Overall, the study provided valuable insights into the relationship between doping system and the basic characteristics of wurtzite-type hexagonal ZnO.","PeriodicalId":134301,"journal":{"name":"Gazi University Journal of Science Part A: Engineering and Innovation","volume":"200 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122506579","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Investigation of Mechanical Properties of Aluminum 7075 Alloy via Surface Engineering 7075铝合金力学性能的表面工程研究
Gazi University Journal of Science Part A: Engineering and Innovation Pub Date : 2023-06-27 DOI: 10.54287/gujsa.1259370
Gözde Altuntaş, Gamze Yazbahar, B. Bostan
{"title":"Investigation of Mechanical Properties of Aluminum 7075 Alloy via Surface Engineering","authors":"Gözde Altuntaş, Gamze Yazbahar, B. Bostan","doi":"10.54287/gujsa.1259370","DOIUrl":"https://doi.org/10.54287/gujsa.1259370","url":null,"abstract":"In this study, MAO process, which is one of the surface coating methods, was applied to 7075-T6 Al alloy in a thin thickness and the relationship between its mechanical properties compared to its uncoated state was investigated. Surface microstructure images of the prepared samples, coating thickness from the cross section and eds analysis were measured by scanning electron microscope (SEM). With the XRD analysis, the peaks in the material on which the coating is made were determined and the difference was examined according to the uncoated state. How the coating affects the dislocation density was investigated. The microhardness value of the samples, which were coated with 2 µm MAO from the surface, was measured according to HV 0.5. The hardness value was thus increased by 50%. The weight loss of coated and uncoated materials was calculated. Despite such a thin coating, the wear resistance has increased approximately 8 times compared to the uncoated state.","PeriodicalId":134301,"journal":{"name":"Gazi University Journal of Science Part A: Engineering and Innovation","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126637579","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Analysis of Dislocation Density for GaN Based HEMTs in Screw Mod 螺旋模中GaN基hemt的位错密度分析
Gazi University Journal of Science Part A: Engineering and Innovation Pub Date : 2023-06-27 DOI: 10.54287/gujsa.1215224
Özlem Bayal, E. Balcı, A. Bilgili, M. Öztürk, S. Özçelik, E. Özbay
{"title":"Analysis of Dislocation Density for GaN Based HEMTs in Screw Mod","authors":"Özlem Bayal, E. Balcı, A. Bilgili, M. Öztürk, S. Özçelik, E. Özbay","doi":"10.54287/gujsa.1215224","DOIUrl":"https://doi.org/10.54287/gujsa.1215224","url":null,"abstract":"Quick response is an important feature in design of optoelectronic cards. So in this study, structural properties of GaN/AlN/AlGaN HEMTs structures grown on sapphire by the chemical vapor adjustment method are analyzed by the X-ray diffraction method. The main property of these kind of materials is that they are resistant to high voltage, temperature, and pressure. Although their performance is worse compared silicon, for forcing limit standards, they present wide research field. In this study, the focus of investigation is dislocation density stemming from lattice mismatch between layers and wafer causing cracks on the surface. In HEMT structure calculation of dislocation density for GaN and AlN represents all structure. High dislocation density for AlN layer is determined because of aggressive behavior of Al element in the structure. Also, quantized GaN layers stop moving of dislocations and prevents surface cracks.","PeriodicalId":134301,"journal":{"name":"Gazi University Journal of Science Part A: Engineering and Innovation","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131041981","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Evaluation of Range Estimation Performance of FLIR with Field Requirements Criteria 用现场需求标准评价前视红外距离估计性能
Gazi University Journal of Science Part A: Engineering and Innovation Pub Date : 2023-06-27 DOI: 10.54287/gujsa.1264848
B. Akin
{"title":"Evaluation of Range Estimation Performance of FLIR with Field Requirements Criteria","authors":"B. Akin","doi":"10.54287/gujsa.1264848","DOIUrl":"https://doi.org/10.54287/gujsa.1264848","url":null,"abstract":"Thermal imaging performance depends on many variables, ranging from the properties of the imaged object to atmospheric transmittance and system parameters. After clarification of the functional needs in system design or procurement, system parameters of the design that can meet these needs should be determined. Diagnosis/recognition from a distance is one of the foremost of these needs. The following briefly introduces the Forward Looking Infrared (FLIR) systems, followed by explanations for calculating the theoretical diagnostic range. After the theoretical information, sample systems are given, and high-performance FLIR systems are presented. To accurately analyze, measure and predict the performance of FLIR systems, a model should calculate summary performance measures of the system in the form of Minimum Resolvable Temperature (MRT) and Modulation Transfer Function (MTF) between a target and its background and estimate range for a given scenario electro-optical required for the performance evaluation of the system. The accuracy of these calculations will ultimately determine the accuracy of the model by which the performance of the FLIR system is evaluated.","PeriodicalId":134301,"journal":{"name":"Gazi University Journal of Science Part A: Engineering and Innovation","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126109871","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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