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Preparation and characterization of iron-ore-imbedded silicone rubber materials for radiation protection

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Nuclear Science and Techniques 2018年第9期29卷 230-235页

作者： bulent Buyuk Engineering Sciences Department Main CampusEngineering and Natural Sciences Faculty Bandirma Onyedi Eylul University

Iron-ore-imbedded silicone rubber materials were produced for radiation shielding. Samples were tested against a Co-60 gamma source, which is widely used in nuclear technology and medicine. Decreasing the particle size of iron ore resulted in better gamma radiation protection owing to more homogenous distribution. In addition, the materials had flexible properties up to the addition of 60 wt% iron ore content. Further, 0.5 mm Pb E gamma protection was provided by using 2.06-mm-thick SDT-60 as the Co-60 source. Iron ore–silicone rubber composites are candidate materials for lead-free flexible radiation protection systems owing to their relatively inexpensive and easy production.

关键词： Iron ore Silicone rubber Radiation shielding Co-60 Lead-free flexible materials Linear attenuation coefficients

Learning distance effect on lignite quality variables at global and local scales

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International Journal of Coal Science & Technology 2021年第5期8卷 856-868页

作者： Cem Yaylagul bulent Tutmez Dodurga Control Directorate Turkish Coal Enterprises(TKI)CorumTurkey Department of Mining Engineering Inonu UniversityMalatyaTurkey

Determining scale and variable effects have critical importance in developing an energy resource *** study aims to explore the relationships in heterogeneous lignite sites using different scale models,spatial weighting as well as error-based pair-wise *** a statistical learning framework,the relationships among the quality variables such as geochemical variables and the contributions of the coordinates to quality measures have been exhibited by generalized additive *** this way,the critical roles of spatial weights provided by the coordinates have been specified at a global *** experimental studies reveal that incorporating the geological weighting in the models as the additional information improves both accuracy and *** relationships among lignite quality variables and sampling locations are spatially non-stationary,the local structure and interdependencies among the variables were analyzed by geographically weighting *** local analyses including spatial patterns of bandwidths,search domains as well as residual-based areal dependencies provided not only the critical zones but also availability of pair-wise model alternatives by calibrating a model at each point for location-specific parameter *** results completely show that the weighting models applied at different scales can take spatial heterogeneity into consideration and these abilities provide some meta-data and specific information using in sustainable energy planning.

关键词： Lignite Distance effect Exploration Generalized Additive Model(GAM) Geographically Weighted Regression(GWR)

Comparative New Insight into the Tectonic Origin of Folds and Thrust Faults of an Extensional Basin: Soke-Kusadasi Basin, Aegean, Western Turkey

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Journal of Earth Science 2020年第3期31卷 582-595页

作者： bulent Dogan Department of Geological Engineering Engineering FacultyUniversity of KocaeliUmuttepe CampusIzmit-Kocaeli 41001Turkey

The Aegean area of the western Anatolian region of Turkey,controlled by the low-angle detachment normal fault system,forms an extensional province,the West Anatolian Extensional Province(WAEP).The tectonic deformation which occurred in the Miocene Period,including the Plio–Quaternary Period has created different structures in both the basement rocks and intra-basin deposits of the *** of these structures,high-angle normal faults,controls the supradetachment Soke-Kusadasi Basin(SKB).Within this basin,there are folds with different axes and thrust faults with a north-northwestnortheast(N,NW,NE)*** folds and thrust faults in the SKB deformed the sedimentary structures of intra-basin *** folds and thrust faults,which caused the rotation of beddings and imbrications in the SKB,are mainly associated with the tectonic process of the low angle detachment normal fault,which affected the SKB and the Aegean part of western *** the SKB,during the process of extensional deformation associated with primary low angle detachment normal faulting,the ramp-flat and inversion geometry observed in the basement rocks and basin deposits of the crust caused folds and thrust faults in only intra-basin *** the WAEP,it is determined for the first time that the folds and thrust faults causing limited shortening deformed the Plio–Quaternary sediments.

关键词： low angle detachment normal fault high angle normal fault fold thrust fault bedding extensional supradetachment basin

Interfacial Microstructure of Diffusion Bonded Inconel 738 and Ferritic Stainless Steel Couple

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Journal of Materials Science & Technology 2009年第4期25卷 527-530页

作者： bulent Kurt Mustafa Ulutan Bartin University Faculty of EngineeringDept.of Metallurgical and Materials Engineering University of Eskisehir Osmangazi Faculty of EngineeringDept. of Mech.Eng

In this study, Inconel 738 alloy was diffusion bonded to a ferritic stainless steel. The effect of bonding temperature on the microstructural development across the joint region was investigated. Following the diffusion bonding, conventional characterization techniques such as scanning electron microscopy （SEM）, energy dispersive X-ray （EDX） and microhardness were used to examine the interracial microstructure. It was seen that bonding temperature was effective on the diffusion of Ni from Inconel 738 to ferritic stainless steel that affected the microstructure of the interface. Austenite phase was formed at the interface as a result of Ni diffusion from the Inconel 738 to the interface.

关键词： Diffusion bonding Inconel 738 Ferritic stainless steel Interface

Is enteroscopy necessary for diagnosis of celiac disease?

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World Journal of Gastroenterology 2012年第31期18卷 4095-4101页

作者： Taylan Kav bulent Sivri Hacettepe University School of Medicine Department of MedicineDivision of GastroenterologySihhiyeAnkara 06100Turkey

Celiac disease （CD） is an autoimmune inflammatory disease of the small intestine as a result of reaction to wheat protein, gluten. Exclusion of dietary gluten is the mainstay of the treatment that necessitates a precise diagnosis of the disease. Serological screen ing may aid in identifying patients with suspected CD, which should be confirmed by intestinal biopsy. It has been shown that duodenal biopsies are good for de- tection of the disease in most patients. However, there is a group of patients with positive serology and incon- clusive pathology. As a result of the widespread use of serology, many patients with equivocal findings grow quickly. Unfortunately current endoscopic methods can only diagnose villous atrophy, which can be present in the later grades of disease （i.e., Marsh m）. To diag- nose CD correctly, going deeper in the intestine may be necessary. Enteroscopy can reveal changes in CD in the intestinal mucosa in 10%-17% of cases that have negative histology at initial workup. Invasiveness of the method limits its use. Capsule endoscopy may be a good substitute for enteroscopy. However, both tech- niques should be reserved for patients with suspected diagnosis of complications. This paper reviews the cur- rent literature in terms of the value of enteroscopy for diagnosis of CD.

关键词： Celiac disease Diagnosis Enteroscopy Single balloon enteroscopy Capsule enteroscopy

New indication area in intersphincteric resection:transanal total mesorectal excision combined with intersphincteric resection

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Gastroenterology Report 2023年第1期11卷 606-607页

作者： bulent Cavit Yuksel Department of Colon&Rectum General SurgeryAnkara Bilkent City HospitalUniversity of Health ScienceAnkaraTurkey

We read the article by Liu et al.[1]entitled“Transanal total mesorectal excision combined with intersphincteric resection has similar long-term oncological outcomes to laparoscopic abdominoperineal resection in low rectal cancer:a propensity scorematched cohort study.”The article is very interesting and boldly ***,I noticed some areas of the article that I could not find the answers to.

关键词： resection rectal sphincter

Acoustic beam splitting in a sonic crystal around a directional band gap

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Chinese Physics B 2013年第11期22卷 350-355页

作者： Ahmet Cicek Olgun Adem Kaya bulent Ulug Department of Physics Faculty of Arts and Sciences Mehmet Akif Ersoy University Department of Computer Education and Educational Technology Faculty of Education Inonu University 44280 Department of Physics Faculty of Science Akdeniz University

Beam splitting upon refraction in a triangular sonic crystal composed of aluminum cylinders in air is experimentally and numerically demonstrated to occur due to finite source size, which facilitates circumvention of a directional band gap. Experiments reveal that two distinct beams emerge at crystal output, in agreement with the numerical results obtained through the finite-element method. Beam splitting occurs at sufficiently-small source sizes comparable to lattice periodicity determined by the spatial gap width in reciprocal space. Split beams propagate in equal amplitude, whereas beam splitting is destructed for oblique incidence above a critical incidence angle.

关键词： sonic crystal directional band gap source size beam splitting

How helpful is capsule endoscopy to surgeons?

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World Journal of Gastroenterology 2007年第27期13卷 3671-3676页

作者： Osman Ersoy bulent Sivri Yusuf Bayraktar The Department of Gastroenterology Hacettepe University Faculty of Medicine Ankara Turkey

Capsule endoscopy is a new technology that, for the first time, allows complete, non-invasive endoscopic imaging of the small bowel. The efficacy of capsule endoscopy in the diagnosis of suspected small bowel diseases has been established. Important applications for surgeons include observations of obscure gastrointestinal bleeding and small bowel neoplasms.

关键词： Capsule endoscopy Surgery Small bowel neoplasm Obscure gastrointestinal bleeding Angiodisplasia

CVaR-based stochastic wind-thermal generation coordination for Turkish electricity market

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Journal of Modern Power Systems and Clean Energy 2019年第5期7卷 1307-1318页

作者： Aycan AYDOGDU Osman bulent TOR Ali Nezih GUVEN Department of Electrical and Electronics Engineering Middle East Technical UniversityAnkara 06800Turkey The Bucharest University of Economic Studies BucharestRomania

Uncertainties in wind power forecasting,dayahead and imbalance prices for the next day possess a great deal of risks for the profit of generation companies participating in a day-ahead electricity *** companies are exposed to imbalance penalties in the balancing market for unordered mismatches between associated day-ahead power schedule and real-time *** of wind and thermal power plants alleviates the risks raised from wind *** paper proposes a novel optimal coordination strategy by balancing wind power forecasting deviations with thermal units in the Turkish day-ahead electricity *** main focus of this study is to provide an optimal trade-off between the expected profit and the risk under wind uncertainty through conditional value at risk(CVa R)*** problem is formulated as a two-stage mixed-integer stochastic programming problem,where scenario-based wind power approach is used to handle the stochasticity of the wind *** programming approach is utilized to attain the commitment status of thermal *** of the coordination with different day-ahead bidding strategies and trade-off between expected profit and CVa R are examined with comparative scenario studies.

关键词： Conditional value at risk(CVaR) Windthermal coordination Electricity market Wind power Thermal power