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Prevalence of microscopic colitis in patients with diarrhea of unknown etiology in Turkey

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World Journal of Gastroenterology 2008年第27期14卷 4319-4323页

作者： levent erdem Sadιk Yιldιrιm Nihat Akbayιr Banu Yιlmaz Necati Yenice Orhan Sami Gültekin nder Peker Department of Gastroen-terology Sisli Etfal Teaching and Research Hospital Department of General Surgery Sisli Etfal Teaching and Research Hospital Department of Pathology Sisli Etfal Teaching and Research Hospital Department of Gastroenterology Okmeydanι Teaching and Research Hospital Endotιp Private Endoscopy Center Department of Pathology Haydarpasa Numune Teaching and Research Hospital

AIM: To investigate the prevalence and demography of microscopic colitis in patients with diarrhea of unknown etiology and normal colonoscopy in Turkey. METHODS: Between March, 1998 to July, 2005, 129 patients with chronic non-bloody diarrhea of unexplained etiology who had undergone full colonoscopy with no obvious abnormalities were included in the study. Two biopsies were obtained from all colonic segments and terminal ileum for diagnosis of microscopic colitis. On histopathologic examination, criteria for lymphocytic colitis (intraepithelial lymphocyte ≥ 20 per 100 intercryptal epithelial cells, change in surface epithelium, mononuclear infiltration of the lamina propria) and collagenous colitis (subepithelial collagen band thickness ≥ 10 μm) were explored. RESULTS: Lymphocytic colitis was diagnosed in 12 (9%) patients (Female/Male: 7/5, mean age: 45 year, range: 27-63) and collagenous colitis was diagnosed in only 3 (2.5%) patients (all female, mean age: 60 years, range: 54-65).CONCLUSION: Biopsy of Turkish patients with the diagnosis of chronic non-bloody diarrhea of unexplained etiology and normal colonoscopic findings will reveal microscopic colitis in approximately 10% of the patients. Lymphocytic colitis is 4 times more frequent than collagenous colitis in these patients.

关键词： Diarrhea of unknown etiology Microscopiccolitis Lymphocytic colitis Collagenous colitis

Direct electrochemical reduction of copper sulfide in molten borax

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International Journal of Minerals,Metallurgy and Materials 2019年第8期26卷 992-998页

作者： levent Kartal Servet Timur Department of Metallurgical and Materials Engineering Hitit UniversityCorum 19030Turkey Department of Metallurgical and Materials Engineering Istanbul Technical UniversityIstanbul 34469Turkey

In this study,for the first time,direct copper production from copper sulfide was carried out via direct electrochemical reduction method using inexpensive and stable molten borax *** effects of current density(100–800 mA/cm^2)and electrolysis time(15–90 min)on both the cathodic current efficiency and copper yield were systematically investigated in consideration of possible electrochemical/chemical reactions at 1200℃.The copper production yield reached 98.09%after 90 min of electrolysis at a current density of 600 mA/cm^*** metal production was shown to be possible with 6 kWh/kg energy consumption at a 600 mA/cm2 current density,at which the highest current efficiency(41%)was *** suggested method can also be applied to metal/alloy production from single-and mixed-metal sulfides coming from primary production and precipitated sulfides,which are produced in the mining and metallurgical industries during treatment of process solutions or wastewaters.

关键词： molten salt electrolysis electro-reduction copper extraction copper sulfide borax

Recurrent acute myocardial infarction and atrial fibrillation

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Journal of Geriatric Cardiology 2017年第02期14卷 153页

作者： levent Cerit Department of Cardiology Near East University

I have read the article entitled Predictors and in-hospital prognosis of recurrent acute myocardial infarction by Cao,et al.[1]with great interest,recently published in *** investigators reported that recurrent acute ... 详细信息

关键词： Acute myocardial infarction Age Atrial fibrillation Diabetes mellitus

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Spiral transitions

Applied Mathematics(A Journal of Chinese Universities) 2018年第4期33卷 468-490页

作者： levent Akin SAHIN Bayram HABIB Zulfiqar Faculty of Science Inonu University Faculty of Science Ege University Department of Computer Science COMSATS University IslamabadLahore Campus

Spiral curves are free from singularities and curvature extrema. These are used in path smoothing applications to overcome the abrupt change in curvature and super-elevation of moving object that occurs between tangent and circular curve. Line to circle spiral transition is made of straight line segment and curvature continuous spiral curve. It is extendible to other important types of transitions like line to line and circle to circle. Although the problem of line to circle transition has been addressed by many researchers, there is no comprehensive literature review available. This paper presents state-of-the-art of line to circle spiral transition,applications in different fields, limitations of existing approaches, and recommendations to meet the challenges of compatibility with today’s CAD/CAM soft wares, satisfaction of Hermite end conditions, approximation of discrete data for image processing, 3 D path smoothness for an unmanned aerial vehicle(UAV), and arc-length parametrization. Whole discussion is concluded with future research directions in various areas of applications.

关键词： path planning spiral continuity curvature extrema line to circle transition

One-step electrochemical reduction of stibnite concentrate in molten borax

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International Journal of Minerals,Metallurgy and Materials 2019年第10期26卷 1258-1265页

作者： levent Kartal Mehmet Baris Daryal Güldem Kartal Sireli Servet Timur Department of Metallurgical and Materials Engineering Hitit UniversityCorum 19030Turkey Department of Metallurgical and Materials Engineering Istanbul Technical UniversityIstanbul 34469Turkey

In this study,antimony production from a stibnite concentrate(Sb2S3)was performed in one step using a molten salt electrolysis method and borax as an *** reduction of the stibnite concentrate was performed at 800℃under galvanostatic conditions and explained in detail by the reactions and intermediate compounds formed in the *** effects of current density(100 800 mA cm^-2)and electrolysis time(10 40 min)on cathodic current efficiency and antimony yields were systematically *** the highest current efficiency,which was obtained at 600 mA cm^-2,direct metal production was possible with 62%cathodic current efficiency and approximately 6 kWh/kg energy *** the end of the 40-min electrolysis duration at 600 mA cm^-2 current density,antimony reduction reached 30.7 g and 99%of the antimony fed to the cell was obtained as metal.

关键词： molten salt electrolysis electrochemical reduction antimony antimony extraction stibnite borax

Adaptive Fault Detection Scheme Using an Optimized Self-healing Ensemble Machine Learning Algorithm

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CSEE Journal of Power and Energy Systems 2022年第4期8卷 1145-1156页

作者： levent Yavuz Ahmet Soran AhmetÖnen Xiangjun Li S.M.Muyeen Electrical and Computer Engineering Department in Abdullah Gül University Kayseri 38080Turkey Department of Electrical and Computer Engineering College of EngineeringSultan Qaboos UniversityAl-KhoudMuscat123Oman Department of Electrical Engineering Qatar UniversityDoha 2713Qatar State Key Laboratory of Control and Operation of Renewable Energy and Storage Systems China Electric Power Rescarch InstituteBeijing 100192China

This paper proposes a new cost-efficient,adaptive,and self-healing algorithm in real time that detects faults in a short period with high accuracy,even in the situations when it is difficult to *** than using traditional machine learning(ML)algorithms or hybrid signal processing techniques,a new framework based on an optimization enabled weighted ensemble method is developed that combines essential ML *** the proposed method,the system will select and compound appropriate ML algorithms based on Particle Swarm Optimization(PSO)*** this purpose,power system failures are simulated by using the PSCA D-Python *** of the salient features of this study is that the proposed solution works on real-time raw data without using any pre-computational techniques or pre-stored ***,the proposed technique will be able to work on different systems,topologies,or data *** proposed fault detection technique is validated by using PSCAD-Python co-simulation on a modified and standard IEEE-14 and standard IEEE-39 bus considering network faults which are difficult to detect.

关键词： Decision tree(DT) ensemble machine learning algorithm fault detection islanding operation k-Nearest Neighbor(kNN) linear discriminant analysis(LDA) logistic regression(LR) Naive Bayes(NB) self-healing algorithm

Dielectric behaviors at microwave frequencies and Mossbauer effects of chalcedony, agate, and zultanite

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Chinese Physics B 2015年第5期24卷 649-655页

作者： levent Paral? Israfil Sabikoglu Jiri Tucek Jiri Pechousek Petr Novak Jakub Navarik Celal Bayar University Departments of Electronics and Automation Celal Bayar University Faculty of Arts and Sciences Department of Physics Muradiye Regional Centre of Advanced Technologies and Materials Department of Experimental Physics Faculty of SciencePalacky University

In this study, dielectric properties within 8-12 GHz microwave frequencies, inductively coupled plasma-atomic emis- sion spectrometry, Fourier transform infrared spectrometry, synchronized two thermal analyses, and 57Fe Mossbauer spectroscopy analysis of chalcedony, agate, and zultanite samples from Turkey are presented. Agate and chalcedony show the same nine vibrational absorption peaks obtained unlike zultanite from FTIR spectra in the 350 cm-1 to 4000 cm-1 range, ε＇ values of chalcedony, agate and zultanite derived at 10.5 GHz were 4.67, 4.41, and 7.34, respectively, eI and e~ values of the studied samples at the microwave frequencies are related to the percentage weight of their constituent parts in their chemical compositions. 57Fe Mossbauer spectroscopy results confirm the existence of iron-containing islands in the crystal structure of zultanite, agate, and chalcedony samples, equipped them with magnetic features typical for magnetic nanoparticles including superparamagnetism. The presence of iron-containing islands significantly affects the magnetic, dielectric, and optical properties of studied samples that are not observed for pure minerals without any foreign inclusions.

关键词： zultanite agate chalcedony microwave dielectric properties Mossbauer effects

Evaluation of periglacial landforms and formation of soil properties on the Mount Honaz,SW Türkiye

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Journal of Mountain Science 2024年第9期21卷 3047-3067页

作者： SERİN Soner UNCU levent DEDE Volkan TÜRKEŞMurat Institute of Social Sciences İstanbul Universityİstanbul 34119Türkiye Department of Geography BilecikŞeyh Edebali UniversityBilecik 11234Türkiye Department of Geography Ardahan UniversityArdahan 75002Türkiye Center for Climate Change and Policy Studies Boğaziçi Universityİstanbul 34342Türkiye

The main aim of this study is to explain periglacial processes on the summits of Mount Honaz(2571 m a.s.l.),define periglacial landforms,and determine the relationships between morphometric features and topographic *** circles,stony earth circles,non sorted steps,and non sorted stripes were identified on the summits of Mount ***'s correlation coefficient(r)and linear regression analyses were performed by taking metric measurements from 125 periglacial landforms to describe their morphometric features(length,width,height)of periglacial landforms and explain the relationships between them and topographic factors(elevation,slope).To explain the relationships between periglacial landforms and soil properties,soil samples from 11 periglacial landforms were taken and *** landforms,which continue to develop on the summits of Mount Honaz today,have been evaluated with present climate *** of soil samples indicates a notable impact of parent material on the genesis of periglacial *** high ratio of organic matter in mud circle and non sorted step landforms and the high lime ratio in stony earth circle landforms prove a strong relationship between the formation mechanisms of landforms and the soil ***,it is consistent with the findings obtained from the analysis that severe periglacial processes and washing and scavenging events are experienced more on the northern slopes.

关键词： Periglacial processes and geomorphology Soil analysis Morphometric analysis Mount Honaz Türkiye

Determining the Zn Content of Cherry in Field Using VNIR Spectroscopy

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光谱学与光谱分析 2015年第2期35卷 355-361页

作者： Mert Dedeoglu levent Basayigit Selcuk University Agriculture FacultySoil Science and Plant Nutrition Department Suleyman Demirel University Agriculture FacultySoil Science and Plant Nutrition Department

Visible and near-infrared(VNIR)spectroscopy is an eco-friendly method used for estimating plant nutrient *** aim of this study was to investigate the possibility of using VNIR method for estimating Zn content in cherry orchard leaves under field *** study was conducted in 3different locations in Isparta region of *** cherry orchards containing normal and Zn deficient plants were chosen,and 60 leaf samples were collected from each *** reflectance spectra of the leaves were measured with an ASD FieldSpec HandHeld spectroradiometer and a plant *** Zn contents of leaf samples were predicted through laboratory *** spectral reflectance measurements were used to estimate the Zn levels using stepwise multiple linear regression analysis *** models were created using the highest coefficient of determination *** results show that Zn content of cherry trees can be estimated using the VNIR spectroscopic method(87.5

关键词： Cherry Spectroradiometer Stepwise Regression Visible and Near Infrared(VNIR) Zn content