检索结果-南通市图书馆

Mechanical lithotripsy and/or stenting in management of difficult common bile duct stones

Hepatobiliary & Pancreatic Diseases International 2009年第5期8卷 524-528页

作者： adem akcakaya Orhan Veli Ozkan Gurhan Bas Atilla Karakelleoglu Orhan Kocaman Ismail Okan Mustafa Sahin First Department of General Surgery Vakif Gureba Training and Research Hospital34280 IstanbulTurkey Faculty of Medicine Department of General SurgeryMustafa Kemal University 31100 HatayTurkey Faculty of Medicine Department of GastroenterologyKocaeli University41760 KocaeliTurkey

BACKGROUND:Mechanical lithotripsy and/or stent insertion is the alternative therapeutic approach in difficult endoscopic retrograde cholangiopancreatography (ERCP)*** study was designed to investigate the appropriate treatment for extraction of bile duct stones in difficult cases of ERCP. METHODS:Between 2000 and 2008,744 ERCP procedures were performed in 592 patients with choledocholithiasis in our endoscopy *** demographic features,and clinical and laboratory findings were collected from a prospectively held *** duct calculi were extracted by basket and/or balloon catheter following ERCP and *** with retained stones were regarded as difficult *** patients were treated with mechanical lithotripsy and those with incomplete clearance of stones underwent stent placement. RESULTS:Two hundred and forty-five patients(41%) were male and 347(59%)were female with a mean age of 58 years(range 19-95 years).Stones were impacted in 27 patients(5%).Stone extraction was performed by basket and/or balloon catheter in 610 ERCP procedures,and lithotripsy was performed in 70 ERCP ***- four patients underwent stent insertion,and 20 underwent stent *** occurred in 39 patients (5%),with no mortality associated with the *** occurred in 9 patients and basket impaction in *** pancreatitis and cholangitis developed in 12 and 11 patients,respectively. CONCLUSION:Difficult cases of bile duct stones can be treated successfully with lithotripsy,and a stent should be applied when the common bile duct cannot be cleared completely.

关键词： common bile duct stone endoscopic retrograde cholangiopancreatography stone extraction mechanical lithotripsy stenting

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Endoscopic retrograde cholangiopancreatography during pregnancy without radiation

引用

World Journal of Gastroenterology 2009年第29期15卷 3649-3652页

作者： adem akcakaya Orhan Veli Ozkan Ismail Okan Orhan Kocaman Mustafa Sahin 1st Department of General Surgery Vakif Gureba Research and Training Hospital 34093 Istanbul Turkey Department of General Surgery Faculty of Medicine Mustafa Kemal University 31100 Hatay Turkey Gastroenterology Division of Medical Faculty Hospital Kocaeli University 41380 Kocaeli Turkey

AIM： To present our experience with pregnant patients who underwent endoscopic retrograde cholangiopancreatography （ERCP） without using radiation, and to evaluate the acceptability of this alternative therapeutic pathway for ERCP during pregnancy. METHODS： Between 2000 and 2008, six pregnant women underwent seven ERCP procedures. ERCP was performed under mild sedoanalgesia induced with pethidine HCI and midazolam. The bile duct was cannulated with a guidewire through the papilla. A catheter was slid over the guidewire and bile aspiration and/or visualization of the bile oozing around the guidewire was used to confirm correct cannulation. Following sphincterotomy, the bile duct was cleared by balloon sweeping. When indicated, stents were placed. Confirmation of successful biliary cannulation and stone extraction was made by laboratory, radiological and clinical improvement. Neither fluoroscopy nor spot radiography was used during the procedure. RESULTS： The mean age of the patients was 28 years （range, 21-33 years）. The mean gestational age for the fetus was 23 wk （range, 14-34 wk）. Five patients underwent ERCP because of choledocholithiasis and/or choledocholithiasis-induced acute cholangitis. In one case, a stone was extracted after precut papillotomy with a needle-knife, since the stone was impacted. One patient had ERCP because of persistent biliary fistula after hepatic hydatid disease surgery. Following sphincterotomy, scoleces were removed from the common bile duct. Two weeks later, because of the absence of fistula closure, repeat ERCP was performed and a stent was placed. The fistula was closed after stent placement. Neither post-ERCP complications nor premature birth or abortion was seen. CONCLUSION： Non-radiation ERCP in experienced hands can be performed during pregnancy. Stent placement should be considered in cases for which complete common bile duct clearance is dubious because of a lack of visualization of the biliary tree.

关键词： Cholangitis Choledocholithiasis Endoscopic retrograde cholangiopancreatography Jaundice Pregnancy

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Comparative study of the electrical properties of Au/n-Si(MS) and Au/Si_3N_4 /n-Si(MIS) Schottky diodes

引用

Chinese Physics B 2013年第6期22卷 627-632页

作者： adem Tataroglu Department of Physics Faculty SciencesGazi University06500AnkaraTurkey

In this paper, the electrical parameters of Au/n-Si （MS） and Au/Si3N4/n-Si （MIS） Schottky diodes are obtained from the forward bias current-voltage （I-V） and capacitance-voltage （C-V） measurements at room temperature. Experimental results show that the rectifying ratios of the MS and MIS diodes at ± 5 V are found to be 1.25 ×103 and 1.27 ×104, respectively. The main electrical parameters of the MS and MIS diodes, such as the zero-bias barrier height （rbBo） and ideality factor （n）, are calculated to be 0.51 eV （I-V）, 0.53 eV （C-V）, and 4.43, and 0.65 eV （I-V）, 0.70 eV （C-V）, and 3.44, respectively. In addition, the energy density distribution profile of the interface states （Nss） is obtained from the forward bias I-V, and the series resistance （Rs） values for the two diodes are calculated from Cheung＇s method and Ohm＇s law.

关键词： Au/n-Si and Au/Si3N4/n-Si type diodes I-V and C-V measurements ideality factor barrier height

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Application of Adapted-Bubbles to the Helmholtz Equation with Large Wavenumbers in 2D

引用

Numerical Mathematics(Theory,Methods and Applications) 2023年第1期16卷 26-57页

作者： adem Kaya Institut füur Mathematik Universität PotsdamKarl-Liebknecht-Str.24-2514476 Potsdam/GolmGermany

An adapted-bubbles approach which is a modification of the residualfree bubbles(RFB)method,is proposed for the Helmholtz problem in 2D.A new two-level finite element method is introduced for the approximations of the bubble *** the other equations such as the advection-diffusion equation,RFB method when applied to the Helmholtz equation,does not depend on another stabilized method to obtain approximations to the solutions of the ***-bubbles(AB)are obtained by a simple modification of the *** modification increases the accuracy of the numerical solution *** provide numerical experiments with the AB method up to ch=5 where c is the wavenumber and h is the mesh *** tests show that the AB method is better by far than higher order methods available in the literature.

关键词： Helmholtz equation adapted-bubbles residual-free bubbles two-level finite element

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Monte Carlo calculations of the incineration of plutonium and minor actinides of laser fusion inertial confinement fusion fission energy (LIFE) engine

引用

Plasma Science and Technology 2018年第7期20卷 159-165页

作者： adem acir esref baysal Gazi University Faculty of TechnologyDepartment of Energy Systems EngineeringTeknikokullarAnkaraTurkey Manisa Celal Bayar Universitesi Hasan Ferdi Turgutlu Faculty of Technology Department of Energy Systems EngineeringManisaTurkey

In this paper, neutronic analysis in a laser fusion inertial confinement fusion fission energy （LIFE） engine fuelled plutonium and minor actinides using a MCNP codes was investigated. LIFE engine fuel zone contained 10 vol% TRISO particles and 90 vol% natural lithium coolant mixture. TRISO fuel compositions have Mod①： reactor grade plutonium （RG-Pu）, Mod②： weapon grade plutonium （WG-Pu） and Mod③： minor actinides （MAs）. Tritium breeding ratios （TBR） were computed as 1.52, 1.62 and 1.46 for Mod（D, Mod② and Mod③, respectively. The operation period was computed as ~21 years when the reference TBR 〉 1.05 for a self- sustained reactor for all investigated cases. Blanket energy multiplication values （M） were calculated as 4.18, 4.95 and 3.75 for Mod①, Mod② and Mod③, respectively. The bumup （BU） values were obtained as ~1230, ~1550 and ~1060 GWd tM-1, respectively. As a result, the higher BU were provided with using TRISO particles for all cases in LIFE engine.

关键词： fusion nuclear Monte Carlo

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Effect of ZrSiO_4 on the Friction Performance of Automotive Brake Friction Materials

引用

Journal of Materials Science & Technology 2007年第6期23卷 843-850页

作者： Mustafa BOZ adem KURT Metallurgy Department Z.K.U.Karabük Technical Education Faculty78200 KarabükTurkey Metallurgy Department Gazi UniversityTechnical Education Faculty06500 AnkaraTurkey

Friction-wear properties of the ZrSiO4 reinforced samples were measured and compared with those of plain bronze based ones. For this purpose, density, hardness, friction coefficient wear behaviour of the samples were tested. Microstructures of samples before and after sintering and worn surfaces were also investigated by scanning electron microscopy （SEM）, and the wear types were determined. The optimum friction-wear behaviour was obtained in the sample compacted at 500 MPa and sintered at 820℃. Density of the final samples decreased with increasing the amount of reinforcing elements （ZrSiO4） before pre-sintering. However after sintering, there is no change in density of the samples including reinforcing elements （ZrSiO4）. With increasing friction surface temperature, a reduction in the friction coefficient of the samples was observed. However, the highest reductions in the friction coefficients were observed in the as-received samples containing 0. 5% reinforced ZrSiO4. The SEM images of the sample indicated that while bronze-based break lining material without ZrSiO4 showed abrasive wear behaviour, increasing the amount of ZrSiO4 resulted a change in abrasive to adhesive wear mechanism. All samples exhibited friction-wear values, which were within the values shown in SAE-J661 standard. With increasing the amount of reinforcing ZrSiO4, wear resistance of the samples was increased. However samples reinforced with 5% and 6% ZrSiO4 showed the best results.

关键词： Friction materials ZrSiO4 Wear Friction Brake lining

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

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

引用

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

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

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

引用

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

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

A New Metaheuristic Approach to Solving Benchmark Problems: Hybrid Salp Swarm Jaya Algorithm

引用

Computers, Materials & Continua 2022年第5期71卷 2923-2941页

作者： Erkan Erdemir adem Alpaslan Altun Department of Information Technologies Tokat Vocational and Technical Anatolian High SchoolMerkez/Tokat60030Turkey Department of Computer Engineering Faculty of TechnologyKonya Selcuk UniversitySelcuklu/Konya42130Turkey

Metaheuristic algorithms are one of the methods used to solve optimization problems and find global or close to optimal solutions at a reasonable computational *** with other types of algorithms,in metaheuristic algorithms,one of the methods used to improve performance and achieve results closer to the target result is the hybridization of *** this study,a hybrid algorithm(HSSJAYA)consisting of salp swarm algorithm(SSA)and jaya algorithm(JAYA)is *** speed of achieving the global optimum of SSA,its simplicity,easy hybridization and JAYA’s success in achieving the best solution have given us the idea of creating a powerful hybrid algorithm from these two *** hybrid algorithm is based on SSA’s leader and follower salp system and JAYA’s best and worst solution *** works according to the best and worst food source *** this way,it is thought that the leader-follower salps will find the best solution to reach the food *** hybrid algorithm has been tested in 14 unimodal and 21 multimodal benchmark *** results were compared with SSA,JAYA,cuckoo search algorithm(CS),firefly algorithm(FFA)and genetic algorithm(GA).As a result,a hybrid algorithm that provided results closer to the desired fitness value in benchmark functions was *** addition,these results were statistically compared using wilcoxon rank sum test with other *** to the statistical results obtained from the results of the benchmark functions,it was determined that HSSJAYA creates a statistically significant difference in most of the problems compared to other algorithms.

关键词： Metaheuristic optimization benchmark algorithm swarm hybrid

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Airborne Pollen Grains of Burdur, Turkey

引用

Acta Botanica Sinica 2000年第8期42卷 864-867页

作者： adem BIC Ahmet AK Depsrtment of Biology Faculty

The pollen grains in the atmosphere of Burdur have been studied for a two_year period (1996 through 1997) with a Durham sampler. A total of 11?881 pollen grains belonging to 39 taxa have been identified and recorded with some unidentified ones. Of them, 5?726 were identified in 1996 and 6?155 in 1997. Of the total pollen grains, 76.51% were arboreal, 21.62% non_arboreal and 1.87% unidentified. The majority of the investigated pollen grains were from Pinus L., Cupressaceae, Gramineae, Quercus L., Platanus L., Chenopodiaceae/Amaranthaceae, Salix L., Cedrus L., Compositae, Juglans L. and Urticaceae respectively. The highest level of pollen concentration was in May.

关键词：土耳其空气花粉浓度花粉过敏周变化月变化

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：