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- 저자 : Kayaalp, Cuneyt (검색결과 5 건)
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Kayaalp, Bu&gcaron,ra,Lee, Siwon,Klauke, Kurt,Seo, Jongsu,Nodari, Luca,Kornowski, Andreas,Jung, WooChul,Mascotto, Simone Elsevier 2019 Applied Catalysis B Vol.245 No.-
<P> The design of perovskite oxides with improved textural properties in combination with tunable composition variations is a forward-looking strategy for the preparation of next generation catalytic converter. In the present work we report the template-free synthesis of mesoporous solid solutions of La<SUB>0.3</SUB>Sr<SUB>0.7</SUB>Ti<SUB>1-x</SUB>Fe<SUB>x</SUB>O<SUB>3±δ</SUB> (0≤x≤0.5) and the study of their catalytic performance towards CH<SUB>4</SUB> and CO oxidation. Using an innovative polymer complex route, phase pure perovskite solid solutions with specific surface area of 65m<SUP>2</SUP> g<SUP>-1</SUP> and average pore size of 15 nm were prepared. The iron concentration increase led to a progressive enhancement of not only both concentration and transport of the charge carriers but also reducibility and oxygen desorption capability on the catalyst. As a result, we observed almost complete conversion of CH<SUB>4</SUB> and CO at 600 ℃ and 300 ℃, respectively. Kinetic studies on methane oxidation showed that competing <I>suprafacial</I> and <I>intrafacial</I> reaction mechanisms coexist, and that the concentration of 30% of Fe maximizes the <I>suprafacial</I> contribution. Under reducing conditions at 600 ℃ the materials retained their structural and morphological integrity, showing superior stability. Finally, the reaction rate of CH<SUB>4</SUB> and CO conversion evidenced that our systems are by a maximum of 90 times more performing than other bulk and nanoporous Fe-based perovskites in literature (e.g. La<SUB>0.66</SUB>Sr<SUB>0.34</SUB>Co<SUB>0.2</SUB>Fe<SUB>0.8</SUB>O<SUB>3-δ</SUB>), as a result their large surface area, intimate gas-solid contact and short intragrain oxygen diffusion pathways induced by the mesoporous structure. </P>
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Cuneyt Kayaalp,Murat Sait Dogan,Veysel Ersan 한국간담췌외과학회 2017 Annals of hepato-biliary-pancreatic surgery Vol.21 No.2
Pancreatic head resection for chronic pancreatitis is a challenging procedure, in the presence of venous collaterals, cavernous transformation, extensive fibrosis or porto-mesenteric stenosis or thrombosis. We present a surgically treated patient for the intractable pain of chronic pancreatitis. Complications with biliary obstruction and portal vein stenosis/thrombosis resulted in cavernous transformation. A pancreaticoduodenectomy combined with portal vein resection was intended in a 51 year-old male, but the procedure was terminated due to the high risk associated with intraoperative bleeding. The surgical procedure was switched to a Frey procedure, wherein partial pancreatic head resection, drainage of the pancreatic canal and sufficient pain palliation, without an increased risk of intraoperative hemorrhage, was ensured. The procedure was successfully combined with bilio-enteric anastomosis.
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Sumer, Fatih,Kayaalp, Cuneyt,Karagul, Servet The Korean Gastric Cancer Association 2016 Journal of gastric cancer Vol.16 No.1
Laparoscopic gastrectomy for cancer has some significant postoperative benefits over open surgery with similar oncologic outcomes. This procedure is more popular in the Far East countries where obesity is not a serious public health problem. In the Western countries, laparoscopic gastrectomy for cancer is not a common procedure, yet obesity is more common. Herein, we aimed to demonstrate the feasibility of laparoscopic gastrectomy for advanced gastric cancer in a morbidly obese patient. Additionally, we used natural orifice specimen extraction as an option to decrease wound-related complications, which are more prevalent in morbidly obese patients. In this case, we performed a fully laparoscopic subtotal gastrectomy with lymph node dissection and Roux-en-Y gastrojejunostomy with the specimen extracted through the vagina. To the best of our knowledge, this was the first report of a natural orifice surgery in a morbidly obese patient with gastric cancer.
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Fatih Sumer,Cuneyt Kayaalp,Servet Karagul 대한위암학회 2016 Journal of gastric cancer Vol.16 No.1
Laparoscopic gastrectomy for cancer has some significant postoperative benefits over open surgery with similar oncologic outcomes. This procedure is more popular in the Far East countries where obesity is not a serious public health problem. In the Western countries, laparoscopic gastrectomy for cancer is not a common procedure, yet obesity is more common. Herein, we aimed to demonstrate the feasibility of laparoscopic gastrectomy for advanced gastric cancer in a morbidly obese patient. Additionally, we used natural orifice specimenextraction as an option to decrease wound-related complications, which are more prevalent in morbidly obese patients. In this case, we performed a fully laparoscopic subtotal gastrectomy with lymph node dissection and Roux-en-Y gastrojejunostomy with the specimen extracted through the vagina. To the best of our knowledge, this was the first report of a natural orifice surgery in a morbidly obese patient with gastric cancer.
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Design of interlocking masonry units and mechanical properties of masonry assemblages
Metin Husem,Fatma Birinci Kayaalp 사단법인 한국계산역학회 2019 Computers and Concrete, An International Journal Vol.23 No.2
This paper describes the design of a new interlocking masonry system, the production of designed interlocking units and mechanical properties of interlocked masonry assemblages with mortar. In this proposed system, units have horizontal and vertical locks to integrate the units to the wall and have a channel to enable the use of horizontal reinforcements in the wall. Using these units, unfilled, filled or reinforced walls can be constructed with or without mortar. In the production of the interlocking units, it was decided to use foamed concrete. 12 trial productions have been carried out at different mix proportions to obtain the optimum concrete mix. At the end of the mentioned productions, the units were produced with foam concrete which is selected as the most suitable in terms of compressive strength and specific gravity. Then, axial compression, diagonal tension and bed joint shear tests were carried out to determine the mechanical properties of the interlocked masonry assemblages with mortar. Results from the tests showed that interlocks designed to strengthen the system against shear stresses by creating discontinuity throughout the joints have been successful to achieve their aim. Obtained data will enable structural analysis of walls to be constructed with these new units.
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