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Effects of contrast media on the hepato-pancreato-biliary system

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World Journal of Gastroenterology 2009年第38期15卷 4788-4793页

作者： omer Topcu Atilla kurt Isilay Nadir Sema Arici Ayhan Koyuncu Cengiz Aydin Department of General Surgery Faculty of MedicineCumhuriyet University Department of Gastroenterology Numune Hospital Department of Pathology Faculty of MedicineCumhuriyet University

AIM： To determine the effects of high osmolarity contrast media （HOCM） and iso-osmolar contrast media （CM） application, with or without pressure, on hepato-pancreato-biliary （HPB） system. METHODS： Sixty rats were divided into six equal groups as follows： Group i：（0.9% NaCl, control）, Group 2：（diatrizoate meglumine Na, ionic HOCM, Urographin）, Group 3：（iodixanol, iso-osmolar nonionic CM, Visipaque）; each of which was applied without pressure, whereas the animals of the remaining three groups （1p, 2p, 3p） were subjected to the same CM with pressure. We performed a duodenal puncture and introduced a catheter into the ampulla. After the catheterization, 0.2 mL CM or 0.9% NaCI was injected with or without pressure. Blood samples were taken for biochemical evaluations. The histopathological examinations of liver, common bile duct, and pancreas were performed. RESULTS： There were no significant differences between the six groups for blood amylase, alanine aminotransferases, aspartate aminotransferases, bilirubin levels （P 〉 0.05）. Alkaline phosphatase and γ glutamyl transaminase levels were higher （P 〈 0.05） in the Urographin groups （2, 2p） than the Visipaque groups （3, 3p）, or control groups （1, 1p）. Hepatocyte necrosis, portal area inflammation, and Kupffer＇s cell hyperplasia were higher （P 〈 0.05） in the study groups than the control group. However, there were no significant differences （P 〉 0.05） between HOCM （2, 2p） and iso-osmolar CM （3, 3p） groups. Bile duct proliferation and regeneration in the Urographin groups （2, 2p） were significantly higher （P 〈 0.05） than the Visipaque~ groups （3, 3p） or the control groups （1, lp）. Although CM caused minor damage to the pancreas, there were no statistically significant differences （P 〉 0.05） between the groups. Application of the CM with pressure did not cause additional damage to the HPB system. CONCLUSION： Iso-osmolar, non-ionic CM could be more reliable than the ionic HOCM, whereas the application of pressure during the

关键词： Contrast media Liver Pancreas Biliarytract Pressure

Effect of Different Amounts of Graphite on the Sintering and Transverse Rupture Properties of Powder Metal Parts

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Journal of Materials Science & Technology 2006年第3期22卷 419-422页

作者： Mustafa Boz Adem kurt Karabuk Technical Education Faculty Zonguldak Karaelmas University Karabuk 78050 Turkey Technical Education Faculty Gazi University Besevler 06500 Ankara Turkey

Iron powders were mixed with graphite powders by 1-15 wt pct to produce block samples using powder metallurgy technique. The powders were blended in a three dimensional blender for 20 min and compacted in a die under 500 MPa by using a one directional press. Sinterability and mechanical properties of the samples with different carbon content were investigated. Sintering process was carried out on a belt furnace with flame curtain in dissociated ammonia atmosphere. Block samples produced were suitable for ASTM B-312 transverse rupture strength test apparatus and were tested with 0.050 kN/s velocity in a press under 100 g load. It was found that graphite amount up to 2 wt pct increased the contact area of particles and acted as a lubricant to affect the sintering behaviour positively. The results indicated that the samples containing up to 5 wt pct showed good sintering behaviour and also good hardness due to an increase in pearlite amount. However, the samples containing higher amount of graphite （more than 5 wt pct） affected the sintering behaviour negatively due to the settlement of free graphite around the Fe powders, which resulted in a decrease in the hardness and transverse rupture strength.

关键词： Powder metallurgy Sintering Fe Graphite Transverse rupture strength

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

Effects of magnet shapes on total harmonic distortion and cogging torque in a permanent magnet synchronous generator for wind turbines

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Clean Energy 2023年第5期7卷 1058-1068页

作者： Erol kurt Adem Dalcalı Gazi University Department of Electrical and Electronics EngineeringTechnology FacultyAnkaraTurkey Bandırma Onyedi Eylul University Department of Electrical and Electronics EngineeringFaculty of Engineering and Natural SciencesBandırmaBalıkesirTurkey National Research University TIIAME100000TashkentUzbekistan

This paper explores and theoretically reports the effects of different magnet structures on the cogging torque and the total harmonic distortion of the output waveforms from a permanent magnet *** generator is a radial flux machine and four different structures are considered for the magnet arrangement in the rotor component and modelled in the Ansys/Maxwell electromagnetic simulation *** three-phase machine exhibits different behaviours towards various magnet structures,***,inclined slotted rectangular,skewed double rectangular and inclined slotted skewed double rectangular,*** has been proven by finite element analysis and Fourier analysis that both the cogging and total harmonic distortion values vary significantly for all *** cogging torque values change in the range of 89.95 to 436.75 mNm and the lowest cogging torque is measured for the inclined slotted skewed double rectangular magnet geometry,while the conventional rectangular magnet geometry yields the worst value with 436.75 ***,the total harmonic distortion values varies between 1.63 and 3.55 for different magnetic *** the worst total harmonic distortion value is obtained from the inclined slotted rectangular magnet,the best total harmonic distortion is acquired from the skewed double rectangular *** these results will provide scientists and engineers with important information in order to obtain more efficient machines.

关键词： renewable energy wind power finite element method synchronous generator wind turbines

Interaction of Mantle Rocks with Crustal Fluids: Sagvandites of the Scandinavian Caledonides

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Journal of Earth Science 2019年第6期30卷 1084-1094页

作者： kurt Bucher Ingrid Stober Mineralogy and Petrology Institute of Earth and Environmental SciencesUniversity of Freiburg79104 FreiburgGermany College of Earth Science and Engineering Shandong University of Science and TechnologyQingdao 266510China

Sagvandite is an enstatite+magnesite rock formed from dunite or harzburgite bodies occurring as tectonically emplaced fragments from the upper mantle in many orogenic belts by interaction with CO2-bearing crustal fluids at upper amphibolite facies P-T *** bodies occur widespread in distinct nappes in the Scandinavian Caledonides in *** to all of the many sagvandite outcrops is their general structure of radial bundles of very coarse cm-sized enstatite crystals and interstitial *** some strongly resorbed primary olivine is preserved,in addition to minor accessory Cr-spinel and *** dunite to sagvandite conversion is governed by three metasomatic reactions:(1)carbonatization of peridotite by CO2-bearing fluids;(2)interaction with external fluids containing dissolved silica;(3)loss of Mg by dissolution of forsterite in NaCl-rich deep *** progressξoverall of all three reactions in proportions that conserve the volume of the original dunite can explain the observed structure and mode of *** relationship among the progressξof the three reactions suggests that loss of Mg by the ultramafic rock is the dominating process in the iso-volume conversion of dunite to sagvandite.

关键词： sagvandite peridotite fluid-rock interaction metasomatism CO2-sequestration

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The plant cell wall

Journal of Integrative Plant Biology 2015年第4期57卷 328-329页

作者： kurt Fagerstedt Anna Karkonen Department of Biosciences Division of Plant Biology University of Helsinki Department of Agricultural Sciences University of Helsinki

Research on the many aspects of the plant cell wall has experienced reiuvenation during the past few years. This is perhaps mainly due to the commercial interest in the chemical components of the cell wall that have potential for industrial use＂ Cellulose for fibers and together with hemicelluloses for bioethanol, lignin for plastics or biofuel, pectins as gel agents, let alone woody cell wall material for construction or pulp production and for intelligent materials for electronics - the new uses are mindboggling!

关键词： cell As The plant cell wall

Applying the New Extended Direct Algebraic Method to Solve the Equation of Obliquely Interacting Waves in Shallow Waters

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Journal of Ocean University of China 2020年第4期19卷 772-780页

作者： kurt Ali TOZAR Ali TASBOZAN Orkun Department of Mathematics Faculty of Science and ArtPamukkale UniversityDenizli 20160Türkiye Department of Physic Faculty of Science and ArtMustafa Kemal UniversityHatay 31001Türkiye Department of Mathematics Faculty of Science and ArtMustafa Kemal UniversityHatay 31001Türkiye

In this study,the potential Kadomtsev-Petviashvili(pKP)equation,which describes the oblique interaction of surface waves in shallow waters,is solved by the new extended direct algebraic *** results of the study show that by applying the new direct algebraic method to the pKP equation,the behavior of the obliquely interacting surface waves in two dimensions can be *** article fairly clarifies the behaviors of surface waves in shallow *** the literature,several mathematical models have been developed in attempt to study these behaviors,with nonlinear mathematics being one of the most important steps;however,the investigations are still at a level that can be called‘baby steps’.Therefore,every study to be carried out in this context is of great ***,this study will serve as a reference to guide scientists working in this field.

关键词： conformable fractional derivative new extended direct algebraic method interacting wave equation shallow water waves

Effect of acupressure on procedural pain before heel lancing in neonates

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Journal of Traditional Chinese Medicine 2021年第2期41卷 331-337页

作者： Tanju Oğul Fatma Yilmaz kurt Research Assistant RNMSNFaculty of Health SciencesPediatric Nursing DepartmentCanakkale Onsekiz Mart UniversityCanakkale 17020Turkey

OBJECTIVE:To investigate the effect of acupressure applied to UB60 and K3 acupuncture points in order to relieve the procedural pain caused by heel lancing blood sampling process in the term ***:The data were collected by using the Information Form and the Neonatal Infant Pain *** applied for 3 min before heel lancing blood sampling in the newborns in the experimental group(n=31).No intervention was applied to newborns in the control group(n=32).RESULTS:A significant difference was found between mean scores of the newborns in the control and acupressure group in favor of the acupressure group in terms of heart rate during and after the procedure,oxygen saturation before,during and after the procedure,duration of crying during and after the procedure(P<0.05).It was found that there was a significant difference between groups in terms of Neonatal Infant Pain Scale mean scores during(P=0.001)and after the procedure(P<0.05),and the difference was found to be in favor of the acupressure ***:As a result,acupressure was found to be an effective method in relieving pain caused by heel lancing blood sampling in newborns.

关键词： Acupressure Pain,procedural Infant,newborn Heel lancing blood sampling

Wear Behavior of Aluminum Matrix Hybrid Composites Fabricated through Friction Stir Welding Process

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Journal of Iron and Steel Research International 2016年第10期23卷 1119-1126页

作者： Halil Ibrahim kurt Murat ODUNCUOGLU Ramazan ASMATULU Department of Mechanical and Metal Technologies Technical SciencesGaziantep University Department of Mechanical Engineering Wichita State University

Effects of friction stir processing（FSP）parameters and reinforcements on the wear behavior of 6061-T6 based hybrid composites were investigated.A mathematical formulation was derived to calculate the wear volume loss of the *** experimental results were contrasted with the results of the proposed *** influences of sliding distance,tool traverse and rotational speeds,as well as graphite（Gr）and titanium carbide（TiC）volume fractions on the wear volume loss of the composites were also investigated using the prepared *** results demonstrated that the wear volume loss of the composites significantly increased with increasing sliding distance,tool traverse speed,and rotational speed;while the wear volume loss decreased with increasing volume fraction of the reinforcements.A minimum wear volume loss for the hybrid composites with complex reinforcements was specified at the inclusion ratio of 50% TiC＋50% Al2O3 because of improved lubricant ability,as well as resistance to brittleness and *** possibilities to develop wear-resistant aluminum-based composites for different industrial applications were proposed.

关键词： aluminum alloy friction stir processing wear hybrid composite modeling