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Utilization of waste vehicle tires in concrete and its effect on the corrosion behavior of reinforcing steels

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International Journal of Minerals,Metallurgy and Materials 2010年第3期17卷 363-370页

作者： oguzhan Kelestemur Department of Construction Education Faculty of Technical EducationFirat University

The mechanical and physical properties of concrete specimens obtained from replacing natural coarse aggregate with waste vehi- cle rubber tires at levels of 2vol%, 5vol%, 7vol%, and 10vol% were studied, and the corrosion behavior of reinforcing steels was investigated in these specimens. Corrosion rates were determined by measuring the galvanic current between steel-reinforced concrete specimens both with and without chloride addition. The change in electrode potential of reinforcing steels in these concrete specimens was measured daily for a period of 60 d in accordance with the testing method in ASTM C876. The results show that the use of waste vehicle tires in concrete instead of coarse aggregate decreases the mechanical strength of the specimens, and increases the corrosion rates of the reinforcing steels embedded in the concretes.

关键词： vehicle tire concrete corrosion reinforcing steel waste reuse

Effect of a semi electro-mechanical engine valve on performance and emissions in a single cylinder spark ignited engine

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2010年第2期11卷 106-114页

作者： Bülent ZDALYAN oguzhan DOGAN Department of Automotive Education Karabuk UniversityKarabuk 78050Turkey

In this study, an electro-mechanical valve （EMV） system for the intake valve ofa fottr stroke, single cylinder, overhead valve and spark ignition （SI） engine was designed and constructed. An engine with the EMV system and a standard engine were tested to observe the effects of the EMV on engine performance and emissions at different speeds under full load. The EMV engine showed improved engine power, engine torque and break specific fuel consumption （BSFC）. A 66% decrease in CO emissions was also obtained with the EMV system, but hydrocarbons （HC） and NOx emissions increased by 12% and 13% respectively.

关键词： Semi electro-mechanic Camless engine Electro-mechanic engine valve Engine performance Emissions

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

Implementation of serverless cloud GIS platform for land valuation

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International Journal of Digital Earth 2021年第7期14卷 836-850页

作者： Muhammed oguzhan Mete Tahsin Yomralioglu Geomatics Engineering Department Istanbul Technical UniversityIstanbulTurkey

Cloud computing enables performing computations and analysis tasks and sharing services in web-based computer centres instead of local desktop *** of the most used areas of cloud computing is geographic information systems(GIS)*** Desktop GIS products are still used in the community frequently,Web GIS and Cloud GIS applications have drawn attention and have become more efficient for *** this study,a serverless Cloud GIS framework is implemented for the land valuation *** order to store,analyse,and share geospatial data,the Aurora Serverless PostgreSQL database is created on Amazon Web Services(AWS).While adopting Aurora Serverless PostgreSQL as a database management system,a simple point in polygon analysis conducted to compare the performances with Amazon Relational Database Service(RDS)*** showed that the serverless database responded to the query faster and scaled up during high workload to decrease ***,parcel vector data,which conveys ownership information and land values attributes,is shared directly from the PostGIS database as vector *** S3 and AWS Lambda services are used for storing and disseminating raster-based land value map *** visualize all shared data and maps through a web browser,open source web mapping library Mapbox GL JS is used.

关键词： Serverless cloud computing cloud GIS open source GIS real estate valuation value map

Postoperative delirium:A tragedy for elderly cancer patients

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World Journal of Gastrointestinal Oncology 2024年第9期16卷 3765-3770页

作者： oguzhan Arun Funda Arun Department of Anesthesiology and Reanimation Selcuk University Faculty of MedicineKonya 42130Türkiye Department of Pedodontics Division of AnesthesiologySelcuk University Faculty of DentistryKonya 42130Türkiye

In this editorial,we comment on the article by Hu et al entitled“Predictive modeling for postoperative delirium in elderly patients with abdominal malignancies using synthetic minority oversampling technique”.We wanted to draw attention to the general features of postoperative delirium(POD)as well as the areas where there are uncertainties and *** can be defined as acute neurocognitive dysfunction that occurs in the first week after *** is a severe postoperative complication,especially for elderly oncology *** the underlying pathophysiological mechanism is not fully understood,various neuroinflammatory mechanisms and neurotransmitters are thought to be *** assessment scales and diagnostic methods have been proposed for the early diagnosis of *** delirium is considered a preventable clinical entity in about half of the cases,various early prediction models developed with the support of machine learning have recently become a hot scientific ***,a model with high sensitivity and specificity for the prediction of POD has not yet been *** situation reveals that all health personnel who provide health care services to elderly patients should approach patients with a high level of awareness in the perioperative period regarding POD.

关键词： Delirium Anesthesia Neurocognitive dysfunction Postoperative cognitive dysfunction Prevention Risk management Synthetic minority oversampling technique Postoperative delirium Elderly patients Abdominal cancer

Evaluation of mixed mode-Ⅰ/Ⅱ criteria for fatigue crack propagation using experiments and modeling

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Chinese Journal of Aeronautics 2018年第7期31卷 1525-1534页

作者： oguzhan DEMIR Ali O.AYHAN Sedat IRIC Hüseyin LEKESIZ Department of Mechanical Engineering Sakarya University Department of Mechanical Engineering Bilecik S?eyh Edebali University Department of Mechanical Engineering Bursa Technical University

In this study, in-plane mixed mode-Ⅰ/Ⅱ fatigue crack growth simulations and experiments are performed for the Al 7075-T651 aluminum alloy which is widely used in the aerospace industry. Tests are carried out under different mode mixity ratios to evaluate the applicability of a fracture criterion developed in a previous study to mixed mode-Ⅰ/Ⅱ fatigue crack growth *** obtained from the analyses and experiments are compared with existing and developed criteria in terms of crack growth lives. Compact Tension Shear（CTS） specimens, which enable mixed mode loading with loading devices under different loading angles, are used in the simulations and experiments. In an effort to model and simulate the actual conditions in the experiments, crack surfaces of fractured specimens are scanned, crack paths are modeled exactly, and contacts are defined between the contact surfaces of a specimen and the loading device for each crack propagation step in the analyses. Having computed the mixed mode stress intensity factors from the numerical analyses, propagation life cycles are predicted by existing and the developed mixed mode-Ⅰ/Ⅱ criteria and then compared with experimental results.

关键词： Crack propagation Fatigue crack growth simulation Fatigue crack growth test Fracture mechanics Mixed mode-Ⅰ/Ⅱ

Endoscopic clipping of gastrojejunostomy leakage following Whipple procedure: A case report

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World Journal of Gastrointestinal Surgery 2024年第9期16卷 3041-3047页

作者： Bahtiyar Muhammedoğlu oguzhan Fatih Ay Department of General Surgery Kahramanmaras Sutcuİmam University Medical FacultyKahramanmaras 46040Türkiye Department of General Surgery Kahramanmaras Necip Fazıl City HospitalKahramanmaras 46140Türkiye

BACKGROUND Currently,perioperative complications of classic Whipple surgery occur at a rate of approximately 40%.Common complications include delayed gastric emptying,pancreatic fistula,and bile leakage,whereas gastrojejunostomy(GJ)leakage is *** SUMMARY This case report will assess the management of a GJ leak in a 71-year-old male patient following the Whipple *** surgery,the patient was trans-ferred to the clinic after four days of intensive care,where vacuum therapy was used to handle a developing subcutaneous *** patient,who had bile in the drains and incision during follow-up,underwent endoscopic examination on the 21st day after the *** opening of approximately 4 mm was observed in the GJ anastomosis during *** titanium clips were used to close the *** drainage of bile decreased to less than 50 mL on the first day after the procedure,and the patient's oral intake was *** Current literature reports a GJ leakage rate of 0.54%following Whipple surgery,with clinical findings lasting on average between 4-34 *** was the main form of therapy for this case,with a success rate of 84%,and percutaneous drai-nage was also utilized as a treatment *** case report is the first to docu-ment endoscopic treatment of GJ leaks following the classic Whipple procedure.

关键词： Pancreas cancer Whipple procedure Gastrojejunostomy Leakage Endos-copic management Case report

Commentary on"Primary orbital monophasic synovial sarcoma with calcification:A case report"

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World Journal of Clinical Cases 2022年第22期10卷 8054-8056页

作者： oguzhan Tokur Sonay Aydın Erdal Karavas Department of Radiology Ankara Training and Research HospitalAnkara 06230Turkey Department of Radiology Erzincan UniversityErzincan 24100Turkey

The present letter to the editor is related to the study titled“Primary orbital monophasic synovial sarcoma with calcification:A case report”.Orbital synovial sarcoma is one of the rare intraorbital masses seen in adult and pediatric *** case reports in the literature revealed that synovial sarcoma may contain ***,it is important to make differential diagnosis among calcified orbital masses in childhood.

关键词： Orbital tumor Synovial sarcoma Calcification Children Histopathology Radiology

Commentary on "Gallstone associated celiac trunk thromboembolisms complicated with splenic infarction: A case report"

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World Journal of Clinical Cases 2022年第32期10卷 12059-12061页

作者： oguzhan Tokur Sonay Aydın Mecit Kantarci Department of Radiology Ankara Training and Research HospitalAnkara 06230Turkey Department of Radiology Erzincan University Medicine FacultyErzincan 24100Turkey

The present letter to the editor is related to the study titled "Gallstone associatedceliac trunk thromboembolisms complicated with splenic infarction: A casereport". Although gallstones are relatively common diseases, its association withthromboembolism is not fully understood. We aim to emphasize the potentialmechanism of this relationship in this letter. In addition, we wanted to contributeto the causes of the spleen infarction and celiac trunk pathologies.

关键词： Gallstone Spleen Infarct Thrombosis Pain