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Evolution of globular microstructures during processing of aluminium slurries

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Transactions of Nonferrous Metals Society of China 2013年第1期23卷 1-6页

作者： yucel BIROL Materials Institute Marmara Research CenterTUBITAK GebzeKocaeliTurkey

Slurry processing experiments were performed with AlSi7Mg0.6 to identify the globularization *** melt sample water quenched slightly above the liquidus point is predominantly dendritic while that cooled into the semi-solid temperature range internally via stirring the melt with a rotating cylindrical block of the alloy itself becomes fully *** globules are much smaller when internal cooling and stirring are employed longer to achieve higher solid fractions before *** dendrite fragments of various sizes are revealed,in the case of stirring after an initial fraction of solid is first formed without the benefit of additional internal cooling.

关键词： Al alloys AlSi7Mg0.6 alloy solidification microstructure internal cooling stirring solid fraction

Synthesis of Al-SrB_6 composite via powder metallurgy processing

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Transactions of Nonferrous Metals Society of China 2015年第3期25卷 677-682页

作者： yucel BIROL Department of Metallurgical and Materials Engineering Dokuz Eylul University

The potential of powder metallurgy processing for the manufacture of Al?SrB6 composites was explored. Al4Sr particles fractured extensively during the ball milling of Al?15Sr/Al?4B powder mixtures. There was no interaction between the Al4Sr and AlB2 compounds across the section of the aluminium grains in the as-milled state. SrB6 formed, when the ball milled powder blends were subsequently annealed at sufficiently high temperatures. Ball milling for 1 h was sufficient for SrB6 to become the major constituent in powder blends annealed at 700 °C while it took 2 h of ball milling for powder blends annealed at 600 °C. Higher annealing temperatures and longer ball milling time encouraged the formation of the SrB6 compound while the latter made a great impact on the microstructural features of the Al?SrB6 composite. The SrB6 compound particles were much smaller and more uniformly distributed across the aluminium matrix grains in powder grains ball milled for 2 h before the annealing treatments at 600 °C and 700 °C.

关键词： Al-SrB6 composites strontium hexaboride ball milling powder metallurgy processing

Precipitation during homogenization cooling in AlMgSi alloys

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Transactions of Nonferrous Metals Society of China 2013年第7期23卷 1875-1881页

作者： yucel BIROL Materials Institute Marmara Research CentreTUBITAKKocaeli 41470Turkey

Precipitation during the industrial cool down takes place predominantly above 300 °C in the EN AW 6082 and 6005 alloys. The phase precipitation throughout cooling is equilibrium phase. A considerable capacity is retained after the cool down for further precipitation during a subsequent heating cycle. The β-Mg 2 Si is once again the predominant phase that forms during a scan heating cycle employed in exactly the same manner with the industrial billet preheating operation. The precipitation in the 6060 alloy, on the other hand, occurs predominantly below 300 °C with additionally ′-Mg 2 Si particles formed below 200 °C.

关键词： aluminium alloys extrusion precipitation homogenization

Exploration of the Townsend regime by discharge light emission in a gas discharge device

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Chinese Physics B 2014年第1期23卷 289-296页

作者： Kurt, Hilal yucel Gazi University Faculty of Sciences Department of Physics 06500 Ankara Turkey

The Townsend discharge mechanism has been explored in a planar microelectronic gas discharge device （MGDD） with different applied voltages U and interelectrode distance d under various pressures in air. The anode and the cathode of the MGDD are formed by a transparent SnO2 covered glass and a GaAs semiconductor, respectively. In the experiments, the discharge is found to be unstable just below the breakdown voltage Ub, whereas the discharge passes through a homo- geneous stable Townsend mode beyond the breakdown voltage. The measurements are made by an electrical circuit and a CCD camera by recording the currents and light emission （LE） intensities. The intensity profiles, which are converted from the 3D light emission images along the semiconductor diameter, have been analysed for different system parameters. Dif- ferent instantaneous conductivity ~t regimes are found below and beyond the Townsend region. These regimes govern the current and spatio-temporal LE stabilities in the plasma system. It has been proven that the stable LE region increases up to 550 Torr as a function of pressure for small d. If the active area of the semiconductor becomes larger and the interlectrode distance d becomes smaller, the stable LE region stays nearly constant with pressure.

关键词： Townsend discharge breakdown microelectronic gas discharge device semiconductor cathode

Cooling slope casting to produce EN AW 6082 forging stock for manufacture of suspension components

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Transactions of Nonferrous Metals Society of China 2014年第6期24卷 1674-1682页

作者： yucel BIROL Seracettin AKDI Materials Institute Marmara Research CentreTUBITAKGebzeKocaeliTurkey R&D Centre AYD Steering and Suspension PartsSelcukluKonyaTurkey

The potential of cooling slope casting process to produce EN AW 6082 forging stock for the manufacture of EN AW 6082 suspension components was *** AW 6082 billets cast over a cooling plate offer a fine uniform structure that can be forged even without a separate homogenization *** is made it possible by the limited superheat of the melt at the start of casting and the fractional solidification that occurs already on the cooling *** parts forged from cast and homogenized billets with or without Cr all showed a umform structure,and the hardness reached HV 110 after the standard artificial ageing treatment.

关键词： aluminium alloys forging cooling slope casting heat treatment

Prevention of Helicobacter pylori infection in childhood

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World Journal of Gastroenterology 2014年第30期20卷 10348-10354页

作者： Oya yucel Pediatric Department Istanbul Health Education and Research HospitalBaskent University34662 IstanbulTurkey

Helicobacter pylori(***)infection is one of the most common infections *** infection rates are falling in the developed and developing countries,*** is still widespread in the *** article has reviewed the important publications on *** in childhood with a focus on its evolving transmission route and the source of infection and preventive strategies in childhood,PubMed was searched up to identify eligible *** publications were searched using the following.

关键词： Children Growth retardation Helicobacter pylori Iron deficiency Prevalence Prevention Transmission

Cholangiocarcinoma:A compact review of the literature

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World Journal of Gastroenterology 2008年第42期14卷 6458-6466页

作者： yucel Ustundag Yusuf Bayraktar Department of Internal Medicine Gastro-enterology Clinic School of Medicine Karaelmas University Department of Internal Medicine Gastro-enterology Clinic School of Medicine Hacettepe University

Cholangiocarcinoma(CC) is a devastating cancer aris-ing from biliary ***,the incidence of this disease is increasing in Western *** tumors progress insidiously,and liver failure,biliary sepsis,malnutrition and cancer cachexia are general modes of death associated with this *** date,no established therapy for advanced dis-ease has been established or ***,our knowledge in tumor biology is increasing dramatically and new drugs are under investigation for treatment of this notorious *** clinical practice,there are better diagnostic tools in use to facilitate an earlier diagnosis of CC,at least in those patients with known risk *** is resectable for cure in only a small percentage of *** staging for vas-cular and biliary extension of CC is very important in this *** and recently endosonography seem to protect against unnecessary laparotomies in these *** the last 15 years,aggressive surgical approaches,including combined liver resec-tions and vascular reconstructive surgical expertise,have improved survival in patients with *** is contraindicated in CC cases having primary sclerosing cholangitis(PSC).Although CC was previously consid-ered a contraindication to liver transplantation,new cautious protocols,including neo-adjuvant chemora-diation therapies and staging procedures before the transplantation,have made it possible to achieve long-term survival after liver transplantation in this *** ablative therapies with photodynamic therapy,intraductal high-intensity ultrasonography and chemo-therapy-impregnated plastic biliary endoprosthesis are important steps in the palliative management of extra-hepatic *** and chemo-embolization methods are also applicable for intra-hepatic CCs as palliative modes of *** need more prospec-tive randomized controlled trials to evaluate the role of the new emerging therapies for CC patients.

关键词： Cholangiocarcinoma Primary sclerosing cholangitis Radiofrequency ablation Chemoembolization

Epilepsy Radiology Reports Classification Using Deep Learning Networks

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Computers, Materials & Continua 2022年第2期70卷 3589-3607页

作者： Sengul Bayrak Eylem yucel Hidayet Takci Department of Computer Engineering Halic UniversityIstanbul34445Turkey Department of Computer Engineering Istanbul University–CerrahpasaIstanbul34320Turkey Department of Computer Engineering Sivas Cumhuriyet UniversitySivas58140Turkey

The automatic and accurate classification of Magnetic Resonance Imaging(MRI)radiology report is essential for the analysis and interpretation epilepsy and *** the majority of MRI radiology reports are unstructured,the manual information extraction is time-consuming and requires specific *** this paper,a comprehensive method is proposed to classify epilepsy and non-epilepsy real brain MRI radiology text reports *** method combines the Natural Language Processing technique and statisticalMachine Learning methods.122 realMRI radiology text reports(97 epilepsy,25 non-epilepsy)are studied by our proposed method which consists of the following steps:(i)for a given text report our systems first cleans HTML/XML tags,tokenize,erase punctuation,normalize text,(ii)then it converts into MRI text reports numeric sequences by using indexbased word encoding,(iii)then we applied the deep learning models that are uni-directional long short-term memory(LSTM)network,bidirectional long short-term memory(BiLSTM)network and convolutional neural network(CNN)for the classifying comparison of the data,(iv)finally,we used 70%of used for training,15%for validation,and 15%for test *** previous methods,this study encompasses the following objectives:(a)to extract significant text features from radiologic reports of epilepsy disease;(b)to ensure successful classifying accuracy performance to enhance epilepsy data ***,our study is a comprehensive comparative study with the epilepsy dataset obtained from numeric sequences by using index-based word encoding method applied for the deep learning *** traditionalmethod is numeric sequences by using index-based word encoding which has been made for the first time in the literature,is successful feature descriptor in the epilepsy data *** BiLSTM network has shown a promising performance regarding the accuracy *** show that the larger sizedmedical text reports can be a

关键词： Epilepsy radiology text report analysis natural language processing feature engineering index-based word encoding deep learning networks-based text classification

Recent neuroanatomical studies on the neurovascular bundle of the prostate and cavernosal nerves:clinical reflections on radical prostatectomy

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Asian Journal of Andrology 2005年第4期7卷 339-349,页

作者： Selcuk yucel Tibet Erdogru Mehmet Baykara Department of Urology Akdeniz University School of MedicineKampus 07070AntalyaTurkey

The neurovascular bundle of the prostate and cavernosal nerves have been used to describe the same structure ever since the publication of the first studies on the neuroanatomy of the lower urogenital tract of men, studies that were prompted by postoperative complications arising from radical prostatectomy. In urological surgery every effort is made to preserve or restore the neurovascular bundle of the prostate to avoid erectile dysfunction （ED）. However, the postoperative potency rates are yet to be satisfactory despite all advancements in radical prostatectomy technique. As the technology associated with urological surgery develops and topographical studies on neuroanatomy are cultivated, new observations seriously challenge the classical teachings on the topography of the neurovascular bundle of the prostate and the cavernosal nerves. The present review revisits the classical and most recent data on the topographical anatomy of the neurovascular bundle of the prostate prostatectomy techniques.

关键词： prostate cancer cavernosal nerves neurovascular bundle neuroanatomy prostatectomy laparoscopy robotics nerve graft penile erection