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Microstructure, mechanical properties and formability of friction stir welded dissimilar materials of IF-steel and 6061 Al alloy

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International Journal of Minerals,Metallurgy and Materials 2019年第6期26卷 722-731页

作者： Semih Mahmut Aktarer Dursun Murat Sekban tevfik kucukomeroglu Gencaga Purcek Department of Automotive Technology Recep Tayyip Erdogan UniversityRize 53020Turkey Department of Naval Architecture and Marine Engineering Karadeniz Technical UniversityTrabzon 61530Turkey Department of Mechanical Engineering Karadeniz Technical UniversityTrabzon 61080Turkey

AA 6061 alloy and interstitial-free(IF)steel plates were joined by the friction stir welding(FSW)method,and the microstructure,mechanical properties,and biaxial stretch formability of the friction stir welded(FSWed)parts were *** results indicate that the FSWed parts showed optimum tensile strength during FSW with the 0.4-mm offset position of the *** Fe4Al13 intermetallic compound formed in the defect-free intersection of AA 6061 and IF-steel plates during *** hardness of the IF-steel part of the FSWed region increased almost 90%relative to its initial hardness of HV0.2 *** tensile and yield strengths of FSWed regions were approximately 170 MPa and 145 MPa,*** to the formability tests,the Erichsen Index(EI)of the IF-steel,AA 6061,and the FSWed samples were determined to be 2.9 mm,1.9 mm,and 2.1 mm,*** EI of the FSWed sample was almost the same as that of the AA 6061 ***,it decreased compared with that of the *** force at EI(FEI)was approximately 1180 N for the FSWed *** value is approximately 70%higher than that of AA 6061 alloy.

关键词： friction stir welding IF-steel aluminum alloy microstructure mechanical properties formability

The role of disaggregated renewable energy consumption on income and load capacity factor:A novel inclusive sustainable growth approach

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Geoscience Frontiers 2024年第1期15卷 39-49页

作者： Ugur Korkut Pata Qiang Wang Mustafa tevfik Kartal Arshian Sharif Osmaniye Korkut Ata University Faculty of Economics and Administrative SciencesDepartment of EconomicsMerkez80000 OsmaniyeTurkey Adnan Kassar School of Business Lebanese American UniversityBeirutLebanon School of Economics and Management China University of Petroleum(East China)Qingdao 266580People’s Republic of China Borsa Istanbul Strategic Planning Financial Reportingand Investor Relations Directorate34467İstanbulTurkey Sunway University Department of Economics&Finance Subang JayaMalaysia University of Economics and Human Sciences in Warsaw WarsawPoland

Stimulating renewable energy consumption is a major focus of the Sustainable Development Goals in combating climate change and global *** International Energy Agency estimates that renewable energy consumption should be doubled to achieve the COP21 *** this context,the question is whether renewable energy types promote the improvement of ecological quality and economic *** studies have investigated the influence of renewable energy on ecological pollution using carbon dioxide emissions or ecological footprint indicators,which only represent the pollution caused by human consumption patterns,and these indicators neglect the supply *** by this point,this study uses the LCF(Load Capacity Factor)as an environmental indicator and examines the causality relationship among different types of renewable energy,income,and environmental quality in the USA,while also incorporating employment and capital stock into the *** using the Fourier causality test with the wavelet-decomposed series,the study explores for the validity of the renewable energy-based growth hypothesis and answers to the question of whether there is a causal effect of renewable energy types on environmental *** results demonstrate that there is a bidirectional causality between total renewable energy,wood,biomass,and economic growth as well as between these renewable energy types and the LCF.

关键词： Load capacity factor Economic growth Renewable energy Fourier approximation Emvironmental quality

INTRINSIC EQUATIONS FOR A GENERALIZED RELAXED ELASTIC LINE ON AN ORIENTED SURFACE IN THE GALILEAN SPACE

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Acta Mathematica Scientia 2013年第3期33卷 701-711页

作者： tevfik SAHIN Department of Mathematics Faculty of Arts and Sciences Amasya University-TURKEY

In this article, we derive the intrinsic equations for a generalized relaxed elastic line on an oriented surface in the Galilean 3-dimensional space G3. These equations will give direct and more geometric approach to ... 详细信息

关键词： Galilean space generalized relaxed elastic line variational problem intrinsicformulation geodesic

Ceria on alumina support for catalytic pyrolysis of Pavlova sp. microalgae to high-quality bio-oils

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Journal of Energy Chemistry 2018年第3期27卷 874-882页

作者： tevfik Aysu Javier Fermoso Aimaro Sanna Institute of Mechanical Process and Energy Engineering (IMPEE) Heriot-Watt University Department of Chemistry Faculty of Education Yuzuncu Yil University

In this work,we report for the first time the in-situ catalytic pyrolysis of Pavlova ***,which has been performed in a fixed-bed reactor in presence of Ce/Al2O3-based *** effects of pyrolysis parameters,such as temperature and catalyst were studied on the products yield distribution and biooil composition,among *** showed that all catalysts increased the bio-oil yield with respect to the non-catalytic runs and reduced the O/C ratio from 0.69（Pavlova sp.）to 0.1–0.15,which is close to that of crude *** terms of bio-oil oxygen content,Mg Ce/Al2O3presented the best performance with a reduction of more than 30%,from 14.1 to 9.8 wt%,of the oxygen concentration in comparison with thermal ***,Ni Ce/Al2O3gave rise to the highest aliphatics/aromatics *** elemental and gas analysis indicates that N was partially removed from the catalytic bio-oils in the gas phase in forms of NH3and HCN.

关键词： Bio-oil Pavlova sp. Pyrolysis Deoxygenation Catalyst Ceria

Kinetic study on leaching of nickel from Turkish lateritic ore in nitric acid solution

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Journal of Central South University 2016年第1期23卷 39-43页

作者： tevfik AGACAYAK Veysel ZEDEF Ali ARAS Department of Mining Engineering Faculty of EngineeringSelcuk University

Dissolution kinetics of nickel from lateritic ore in nitric acid solution was investigated. Experimental parameters used were stirring speed(100-600 r/min), temperature(40-96 °C), nitric acid concentration(0.1-2 mol/L) and particle size(<106 μm). The shrinking core model was applied to the results of experiments investigating the effects of leaching temperature in the range of 40-90 °C and nitric acid concentration in range of 0.1-2 mol/L on nickel dissolution rate. The kinetic analysis shows that the nickel dissolution from lateritic ore could be described by diffusion model. The activation energy(E_a) for the dissolution reaction is calculated as 79.52 kJ/mol.

关键词： leaching lateritic ore nickel kinetic analysis diffusion nitric acid

Study of Kinetics of Complexation Reaction of Co^(2+) with 2-benzoylpyridine-4-phenyl-3-thiosemicarbazone and Kineticspectrophotometric Determination of Cobalt

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物理化学学报 2006年第12期22卷 1484-1488页

作者： BINGOL.Haluk ATALAY.tevfik Faculty of Education Department of Chemistry Selcuk UniversityKonya 42090TurkeyFaculty of EducationDepartment of ChemistrySelcuk UniversityKonya 42090Turkey

Kinetics of complexation reaction of Co2+ with 2-benzoylpyridine-4-phenyl-3-thiosemicarbazone(BPPT) was spectrophotometrically examined at 421 *** ligand that is developed for a simple kinetic-spectrophotometric determination of Co2+ is based on 1:2 complex formation between Co2+ and *** complexation reaction was carried out in ethanol-water medium at 25 ℃.Kinetic and activation parameters of the complexation reaction were calculated,and the rate equation and the reaction mechanism were *** calibration graph is linear in the concentration range of 0.10～2.91 mg·L-1 for the tangent *** species that caused interference were investigated.

关键词：钴动力学研究缩氨基硫脲分光谱测量

Comment on pediatric living donor liver transplantation decade progress in Shanghai: Characteristics and risks factors of mortality

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World Journal of Gastroenterology 2020年第30期26卷 4564-4566页

作者： Sami Akbulut tevfik Tolga Sahin Sezai Yilmaz Deaprtment of Surgery and Liver Transplant Institute Inonu University Faculty of MedicineMalatya 44280Turkey

Since the first successful liver transplantation was performed five decades ago,pediatric liver transplantation has become the gold standard treatment choice for pediatric liver disease,including metabolic diseases,liver tumors,and some acute liver *** improvements in immunosuppression,surgical techniques,and postoperative medical care,long-term outcomes of patients after liver transplantation have markedly improved,especially in pediatric patients.

关键词： Pediatric end stage liver disease Living donor pediatric liver transplantation Survival analysis Risk factors Living donor liver transplantation Outcomes

COVID-19 pandemic:Its impact on liver disease and liver transplantation

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World Journal of Gastroenterology 2020年第22期26卷 2987-2999页

作者： tevfik Tolga Sahin Sami Akbulut Sezai Yilmaz Deaprtment of Surgery and Liver Transplant Institute Inonu University Faculty of MedicineMalatya 244280Turkey

Severe pulmonary disease caused by the novel coronavirus[severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)],has devastated many countries around the *** has overwhelmed the medical *** priorities of many institutions have changed to manage critically ill corona virus infectious disease-2019(COVID-19)patients,which affected the working style of many *** and transplant surgeons look after a very sensitive patient *** with liver disease need special attention and continuous ***,transplant candidates also need special *** professionals in the field of hepatology face the overwhelming task of taking care of COVID-19 patients with hepatic complications,liver disease or transplant patients who are SARS-CoV-2 positive,and the patients on routine surveillance who do not have *** review will evaluate COVID-19 from the perspective of its effect on the liver and its possible effects on patients with liver ***,the level of care for liver transplant recipients during the pandemic will be discussed.

关键词： SARS-Cov-2 COVID-19 Acute liver injury Chronic liver disease Liver transplantation Risk factors

Impact of COVID-19 pandemic on clinicopathological features of transplant recipients with hepatocellular carcinoma:A case-control study

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World Journal of Clinical Cases 2022年第15期10卷 4785-4798页

作者： Sami Akbulut tevfik Tolga Sahin Volkan Ince Sezai Yilmaz Surgery and Liver Transplant Institute Inonu University Faculty of MedicineMalatya 44280Turkey

BACKGROUND The coronavirus disease 2019(COVID-19)pandemic had a significant impact on the management of all *** diseases such as cancer have a higher risk of COVID-19-related *** this fact,any delay or alteration in treatment of cancer may have fatal *** carcinoma(HCC)is an aggressive liver cancer that requires multimodality treatment to improve *** To evaluate the impact of COVID-19 on the management of patients with HCC by determining changes in demographic,clinical and histopathological *** Demographic,clinical and pathological variables of patients with HCC who had undergone liver transplantation between March 2020 and June 2021(Pandemic group,n=48)were retrospectively compared with that of the patients with HCC transplanted between November 2018 and March 2020(Pre-pandemic group,n=61).RESULTS The median age of the patients in the study was 56(interquartile range=15).Ninety-seven patients(89%)were male and 12 were female(11%).The most common etiology of liver disease was hepatitis B virus(n=52,47.7%).According to our results,there was a 21.3% drop in the number of patients transplanted for *** was no difference in the demographic,clinical and pathological characteristics of the patients except blood alkaline phosphatase levels(P=0.029),lymphovascular invasion(P=0.019)and type of the liver graft that was transplanted(P=0.017).CONCLUSION It is important to develop a surveillance strategy for liver transplant *** liver transplantation for HCC is justified and safe provided that strict surveillance protocols are applied.

关键词： COVID-19 pandemic Liver transplantation Hepatocellular carcinoma Biological behavior