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Diffusion Coefficient in Silicon Solar Cell with Applied Magnetic Field and under Frequency: Electric Equivalent Circuits

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World Journal of Condensed Matter Physics 2014年第2期4卷 84-92页

作者： Amadou Diao Ndeye Thiam Martial Zoungrana gokhan sahin Mor Ndiaye Grégoire Sissoko Laboratory of Environment Materials Physics Department Training and Research Unit in Applied Science University of Ouagadougou Ouagadougou Burkina Faso Laboratory of Semiconductors and Solar Energy Physics Department Faculty of Science and Technology University Cheikh Anta Diop Dakar Sénégal

In this paper, a theory on the determination of the diffusion coefficient of excess minority carriers in the base of a silicon solar cell is presented. The diffusion coefficient expression has been established and is related to both frequency modulation and applied magnetic field;the study is then carried out using the impedance spectroscopy method and Bode diagrams. From the diffusion coefficient, we deduced the diffusion length and the minority carriers’ mobility. Electric parameters were derived from the diffusion coefficient equivalent circuits.

关键词： Solar Cell Magnetic Field Frequency Modulation Diffusion Coefficient

How has the COVID-19 pandemic changed treatment preferences of patients with proximal ureteral stones?

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Non-crossing Quantile Regression Neural Network as a Calibration Tool for Ensemble Weather Forecasts

当代泌尿学（英文） 2024年第1期18卷 66-70页

作者： Ali Kaan Yildiz Ahmet Varan Hakan Kurt Omer gokhan Doluoglu Berat Cem Ozgur Department of Urology University of Medical SciencesAnkara Training and Research HospitalAnkaraTurkey

Background:The impact of the coronavirus disease 2019(COVID-19)pandemic on patient decision making remains *** study aimed to investigate the effect of the pandemic on treatment preferences of patients with proximal ureteral stones.Materials and methods:Retrospective data regarding treatment preferences of patients diagnosed with symptomatic proximal ure-teral stones between July 2018 and November 2021 at a single center were *** from 493 patients were analyzed according to 2 groups,including patients diagnosed during the COVID-19 pandemic and those diagnosed during an equivalent period of time be-fore the pandemic.Results:Preference for conservative treatment increased during the COVID-19 pandemic(p=0.009).In patients who had previously undergone shock wave lithotripsy(SWL),the preference for SWL decreased and the preference for conservative treatment increased during the COVID-19 pandemic(p=0.042).Multiple logistic regression analysis revealed a significant correlation between a preference for conservative treatment during the pandemic and no prior spontaneous stone passage(p=0.003;odds ratio[OR],2.48;95％con-fidence interval[CI],1.45-4.23),no hydronephrosis(p=0.035;OR,3.57;95％Cl,1.34-9.49),and a visual analog scale score of 4 or less(p=0.018;OR,1.97;95％Cl,1.15-3.38).Conclusions:A significant increase in the preference for conservative treatment was observed among patients diagnosed during the pandemic,and patients with a history of SWL demonstrated a preference shift from SWL to conservative treatment.

关键词： COVID-19 pandemic Treatment preference Ureter Urolithiasis

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Advances in Atmospheric Sciences 2024年第7期41卷 1417-1437页

作者： Mengmeng SONG Dazhi YANG Sebastian LERCH Xiang'ao XIA gokhan Mert YAGLI Jamie M.BRIGHT Yanbo SHEN Bai LIU Xingli LIU Martin Janos MAYER School of Electrical Engineering and Automation Harbin Institute of TechnologyHarbin150001China Heidelberg Institute for Theoretical Studies Schloss-Wolfsbrunnenweg 3569118HeidelbergGermany Chair of Statistical Methods and Econometrics Karlsruhe Institute of Technology(KIT)Bluecherstr.1776185KarlsruheGermany Key Laboratory of Middle Atmosphere and Global Environment Observation Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing100029China Solar Energy Research Institute of Singapore(SERIS) National University of Singapore(NUS)Singapore117574Singapore UK Power Networks LondonSE61NPUK China Meteorological Administration Beijing100081China Heilongjiang Meteorological Bureau Harbin150001China Department of Energy Engineering Faculty of Mechanical EngineeringBudapest University of Technology and EconomicsMűegyetem rkp.3H-1111BudapestHungary

Despite the maturity of ensemble numerical weather prediction(NWP),the resulting forecasts are still,more often than not,*** such,forecast calibration tools have become *** those tools,quantile regression(QR)is highly competitive in terms of both flexibility and predictive ***,a long-standing problem of QR is quantile crossing,which greatly limits the interpretability of QR-calibrated *** this point,this study proposes a non-crossing quantile regression neural network(NCQRNN),for calibrating ensemble NWP forecasts into a set of reliable quantile forecasts without *** overarching design principle of NCQRNN is to add on top of the conventional QRNN structure another hidden layer,which imposes a non-decreasing mapping between the combined output from nodes of the last hidden layer to the nodes of the output layer,through a triangular weight matrix with positive *** empirical part of the work considers a solar irradiance case study,in which four years of ensemble irradiance forecasts at seven locations,issued by the European Centre for Medium-Range Weather Forecasts,are calibrated via NCQRNN,as well as via an eclectic mix of benchmarking models,ranging from the naïve climatology to the state-of-the-art deep-learning and other non-crossing *** and stringent forecast verification suggests that the forecasts post-processed via NCQRNN attain the maximum sharpness subject to calibration,amongst all ***,the proposed conception to resolve quantile crossing is remarkably simple yet general,and thus has broad applicability as it can be integrated with many shallow-and deep-learning-based neural networks.

关键词： ensemble weather forecasting forecast calibration non-crossing quantile regression neural network CORP reliability diagram post-processing

Study of the Intrinsic Recombination Velocity at the Junction of Silicon Solar under Frequency Modulation and Irradiation

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Journal of Applied Mathematics and Physics 2015年第11期3卷 1522-1535页

作者： El Hadji Ndiaye gokhan sahin Moustapha Dieng Amary Thiam Hawa Ly Diallo Mor Ndiaye Grégoire Sissoko Laboratory of Semiconductors and Solar Energy Physics Department Faculty of Science and Technology University Cheikh Anta Diop Dakar Senegal

In this study, a method for determining the intrinsic recombination velocity at the junction of a silicon solar cell is presented. The expression of intrinsic recombination velocity at the junction was established under irradiation in frequency modulation. Based on this expression, an electrical model of the intrinsic recombination velocity at the junction is presented.

关键词： Silicon Solar Cell Frequency Modulation Intrinsic Recombination Velocity at the Junction Irradiation Energy

Capacitance of Vertical Parallel Junction Silicon Solar Cell under Monochromatic Modulated Illumination

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Journal of Applied Mathematics and Physics 2015年第11期3卷 1536-1543页

作者： gokhan sahin Moustapha Dieng Mohamed Abderrahim Ould El Moujtaba Moussa Ibra Ngom Amary Thiam Grégoire Sissoko Physics Department Faculty of Sciences and Techniques University of Cheikh Anta Diop Dakar Senegal

The aim of this study is to show the influence of the wavelength on the electrical parameters of vertical parallel junction silicon solar cell by use of impedance spectroscopy technique. The Bode diagrams of the diffusion capacitance are shown for different wavelengths while the solar cell operates under both open circuit and short circuit conditions. The Nyquist diagram of the diffusion capacitance has shown the extension of the space charge region for various wavelengths.

关键词： Vertical Parallel Junction Wavelength Capacitance Bode and Nyquist Diagrams

Performance-driven design methodology for habitation shell design in extreme conditions on Mars

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Frontiers of Architectural Research 2022年第2期11卷 224-238页

作者： gokhan Dede Department of Architecture Built Environment and Construction EngineeringPolitecnico di MilanoVia Giuseppe Ponzio3120133 MilanoItaly

The research project illustrates how performance-driven design tools can be conducted as an architectural design methodology that suggests an innovative approach to design a habitation shell in extreme environmental conditions without human *** research study attempts to use environmental data revealed by NASA and its habitat design requirements to develop a conceptual design for an innovative habitation form and then simulate it with Mars conditions to analyze the habitation shell’s structural behavior according to finite element *** this regard,research phases,including layout configuration,form-finding,and structural analysis,have been conducted to explore a habitation concept implemented with generative design tools as a decision-maker in extreme *** conclusion,two generated typologies of proposed habitation forms will be compared in terms of their structural performance under extreme loads of the martian *** this research project,due to the numerous extreme challenges of design and construction of habitation in extreme conditions using conventional approaches,a performance-driven design methodology will provide a rational and sustainable design methodology to tackle extreme barriers to Mars’s environment.

关键词： Performance-driven shell design Finite element model In-situ material Extreme conditions Mars habitation

Notes on Curves at a Constant Distance from the Edge of Regression on a Curve in Galilean 3-Space G_(3)

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Computer Modeling in Engineering & Sciences 2023年第6期135卷 2731-2742页

作者： Ali Cakmak Sezai Kızıltug gokhan Mumcu Department of Mathematics Faculty of Arts and SciencesBitlis Eren UniversityBitlis13000Turkey Graduate School of Natural and Applied Sciences Erzincan Binali Yıldırım UniversityErzincan24002Turkey Department of Mathematics Faculty of Arts and ScienceErzincan Binali Yıldırım UniversityErzincan24002Turkey

In this paper,we define the curve rλ=r+λd at a constant distance from the edge of regression on a curve r(s)with arc length parameter s in Galilean ***,d is a non-isotropic or isotropic vector defined as a vector tightly fastened to Frenet trihedron of the curve r(s)in 3-dimensional Galilean *** build the Frenet frame{Tλ,Nλ,Bλ}of the constructed curve rλwith respect to two types of the vector d and we indicate the properties related to the curvatures of the curve rλ.Also,for the curve rλ,we give the conditions to be a circular ***,we discuss ruled surfaces of type A generated via the curve rλand the vector D which is defined as tangent of the curve rλin 3-dimensional Galilean *** constructed ruled surfaces also appear in two *** first is constructed with the curve rλ(s)=r(s)+λT(s)and the non-isotropic vector *** second is formed by the curve rλ=r(s)+λ2N+λ3B and the non-isotropic vector *** calculate the distribution parameters of the constructed ruled surfaces and we show that the ruled surfaces are ***,we provide examples and visuals to back up our research.

关键词： Edge of regression Galilean space curvature helix ruled surface

A novel paradigm for feedback control in LPBF:layer-wise correction for overhang structures

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Advances in Manufacturing 2022年第2期10卷 326-344页

作者： Ema Vasileska Ali gokhan Demir Bianca Maria Colosimo Barbara Previtali Department of Mechanical Engineering Polytechnic University of MilanVia La Masa 120156 MilanItaly

In laser powder bed fusion(LPBF),it is common practice to select process parameters to achieve high density parts starting from simple geometries such as cubes or ***,additive manufacturing is usually adopted to producevery complex geometries,where parameters should be tuned locally,depending on the local features to be *** fact,geometrical features,such as overhangs,acute corners,and thin walls may lead to over-or under-heating conditions,which may result in geometrical inaccuracy,high roughness,volumetric errors(i.e.,porosity)oreven job failure due to *** work proposes a layer-wise control strategy to improve the geometrical precision of overhanging regions using a coaxial melt pool monitoring *** meltpool images acquired at each layer are used in a controlloop toadapt theprocess parameters locally at the next layer in order to minimize surface *** particular,the laser duty cycle is used as a controllable parameterto correct the energy *** work presents the main architecture of the proposed approach,the control strategy and the experimental procedure that need to be applied to design the control *** layer-wise control strategy was tested on AISI 316L stainless steel using an open LPFB *** results showed that the proposed layer-wise control solution results in a constant melt pool observed via the laser heated area size starting from the second layer onward,leading to a significant improvement in the geometrical accuracy of 5 mm-long bridge geometries.

关键词： Closed-loop control Melt pool monitoring:Defect correction Pulsed-wave emission

Seronegative autoimmune hepatitis in childhood

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World Journal of Clinical Pediatrics 2023年第3期12卷 77-85页

作者： Ali Islek gokhan Tumgor Department of Pediatric Gastroenterology Cukurova University School of Medicine

Comprehensive guidelines on seropositive autoimmune hepatitis have been published for both adults and children,although these guidelines comprise only limited knowledge about seronegative autoimmune *** hepatitis presents as an acute or chronic progressive disease and poor outcomes are inevitable if left *** absence of autoantibody positivity,hypergammaglobulinemia and lack of comprehensive algorithms makes seronegative autoimmune hepatitis a mysterious *** general,seronegative autoimmune hepatitis often presents with acute hepatitis,and its treatment and prognosis similar to seropositive autoimmune *** present review focuses on the known characteristics of seronegative autoimmune hepatitis in childhood,and those of which current knowledge is vague.

关键词： Seronegative autoimmune hepatitis Autoantibody negative Lymphocytopenia Aplastic anemia