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Numerical Investigation of the Effect of Surface Roughness on the Viscous Resistance Components of Surface Ships

Journal of Marine Science and Application 2022年第3期21卷 71-82页

作者： Utku Cem Karabulut Yavuz HakanÖzdemir barışbarlas Bandırma Onyedi Eylül University Department of Naval Architecture and Marine Engineering10200 BalıkesirTurkey Çanakkale 18 Mart University Department of Motor Vehicles and Transportation Technologies17020ÇanakkaleTurkey Istanbul Technical University Department of Naval Architecture and Marine Engineering34469İstanbulTurkey

Recently,computational fluid dynamics(CFD)approaches have been effectively used by researchers to calculate the resistance characteristics of ships that have rough outer *** approaches are mainly based on modifying wall functions using experimentally pre-determined roughness *** several recent studies have shown that CFD can be an effective tool to calculate resistance components of ships for different roughness conditions,most of these studies were performed using the same ship geometry(KRISO Container Ship).Thus,the effect of ship geometry on the resistance characteristics of rough hull surfaces is worth *** this study,viscous resistance components of four different ships are calculated for different roughness ***,flat plate simulations are performed using a previous experimental study for comparison ***,the viscous resistance components of three-dimensional hulls are *** simulations are performed using two different turbulence models to investigate the effect of the turbulence model on the *** examination of the distributions of the local skin friction coefficients of the DTMB 5415 and Series 60 showed that the plumpness of the bow form has a significant effect on the increase in frictional resistance with increasing *** significant finding of the study is that viscous pressure resistance is directly affected by the surface *** all geometries,viscous pressure resistances showed a significant increase for highly rough surfaces.

关键词： surface roughness frictional resistance ship resistance computational fluid dynamics RANS

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Numerical Study on the Hydrodynamic Performance of Antifouling Paints

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Journal of Marine Science and Application 2020年第1期19卷 41-52页

作者： Utku Cem Karabulut Yavuz HakanÖzdemir barışbarlas Department of Naval Architecture and Marine Engineering Bandırma Onyedi Eylül University10200 BalıkesirTurkey Department of Motor Vehicles and Transportation Technologies Çanakkale 18 Mart University17020ÇanakkaleTurkey Department of Naval Architecture and Marine Engineering İstanbul Technical University34469İstanbulTurkey

This study presents a simple numerical method that can be used to evaluate the hydrodynamic performances of antifouling *** Reynolds-averaged Navier-Stokes equations were solved through a finite volume technique,whereas roughness was modeled with experimentally determined roughness ***,the methodology was validated with previous experimental studies with a flat ***,flow around the Kriso Container Ship was ***,full-scale results were predicted using Granville’s similarity *** indicated that roughness has a similar effect on the viscous pressure resistance and frictional resistance around a Reynolds number of 10^***,the increase in frictional resistance due to roughness was calculated to be approximately 3%-5%at the ship scale depending on the paint.

关键词： Antifouling paint Surface roughness Frictional resistance Ship resistance Computational fluid dynamics RANS

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Combustion characteristics of low-quality lignite for different bed material sphericities in a circulating fluidized bed boiler:A numerical study

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Particuology 2024年第7期90卷 364-382页

作者： barış Gürel Gülşah Karaca Dolgun Osman İpek Ali Keçebaş Department of Mechanical Engineering Engineering FacultySüleyman Demirel UniversityÇünürIspartaTurkey Department of Energy Systems Engineering Technology FacultyMuğla SıtkıKoçman UniversityKötekliMenteşeMuğlaTurkey

This study delves into the combustion behavior of various lignite types within a circulating fluidized bed boiler(CFBB),with a primary focus on the impact of different bed material sphericity ratios(0.5,0.7,and 0.9).Utilizing bed material with a sphericity ratio of 0.9 sourced from theÇan power plant and verified through experimentation,the research reveals several key ***,furnace temperatures tended to rise with higher sphericity ratios,albeit with variations between lignite types,particularly highlighting the complexity of this relationship in the case of GLI-Tunçbilek *** levels in the combustion chamber remained consistent across different sphericity ratios,indicating minimal influence on pressure *** combustion efficiency,especially at the bottom of the boiler,was observed at lower sphericity levels(0.5 and 0.7)forÇan lignite,as reflected in CO_(2) mole *** NO_(x) emissions generally decreased with lower sphericity,the sensitivity to sphericity varied by lignite type,with Ilgın lignite showcasing low NO_(x) but high SO_(2) emissions,underscoring the intricate interplay between lignite properties,sphericity,and ***,this study advances our understanding of CFBB combustion dynamics,offering insights valuable for optimizing performance and emissions control,particularly in lignite-based power.

关键词： Circulating fluidized bed boiler Computational particle fluid dynamics method Particle sphericity ratios NO_(x)and SO_(2)emissions Energy production efficiency

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Role of biomarkers in community-acquired pneumonia management

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Journal of Acute Disease 2024年第3期13卷 87-92页

作者： Bahaeddin Onur Hakan barışDemirbas Arif Gulmez Department of Emergency Medicine Istanbul Health and Technology UniversityIstanbulTurkey Department of Emergency PHCCAl Karaana Health CenterDohaQatar Department of Emergency PHCCUmm Slala Health CenterDohaQatar Department of Family Medicine PHCCAl Thumama Health CenterDohaQatar

Community-acquired pneumonia(CAP)poses a significant global health threat,particularly affecting vulnerable *** and scoring systems play a crucial role in diagnosing,assessing severity,and guiding treatment decisions for CAP *** like C reactive protein,procalcitonin,and the neutrophil-to-lymphocyte ratio aid in diagnosis and severity assessment,while scoring systems such as CURB-65 and Pneumonia Severity Index classify patients into risk *** biomarkers(uremia,elevated respiratory rate,hypotension,and age≥65)like serum amyloid A and S100 proteins show promise in predicting disease severity and ***,further research is needed to determine their precise roles and clinical utility in CAP management.

关键词： CURB-65 Community-acquired pneumonia Procalcitonin Alpha-1 antitrypsin Serum amyloid A

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An emerging terpolymeric nanoparticle pore former as an internal recrystallization inhibitor of celecoxib in controlled release amorphous solid dispersion beads:Experimental studies and molecular dynamics analysis

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Acta Pharmaceutica Sinica B 2024年第6期14卷 2669-2684页

作者： Jamie Anne Lugtu-Pe Xuning Zhang Sako Mirzaie Hao Han R.Chang Nour AL-Mousawi Kuan Chen Yongqiang Li Anil Kane Daniel bar-Shalom Xiao Yu Wu Advanced Pharmaceutics and Drug Delivery Laboratory Leslie Dan Faculty of PharmacyUniversity of TorontoToronto M5S 3M2Canada Candoo Pharmatech Company Inc. Mississauga L5N 5M1Canada Department of Pharmacy University of CopenhagenCopenhagen DK-2100Denmark Patheon by Thermo Fisher Scientific Toronto Region Operations(TRO)Mississauga L5N 3X4Canada

Solid oral controlled release formulations feature numerous clinical advantages for drug candidates with adequate solubility and dissolution ***,most new chemical entities exhibit poor water solubility,and hence are exempt from such *** combining drug amorphization with controlled release formulation is promising to elevate drug solubility,like other supersaturating systems,the problem of drug recrystallization has yet to be resolved,particularly within the dosage ***,we explored the potential of an emerging,non-leachable terpolymer nanoparticle(TPN)pore former as an internal recrystallization inhibitor within controlled release amorphous solid dispersion(CRASD)beads comprising a poorly soluble drug(celecoxib)reservoir and insoluble polymer(ethylcellulose)*** to conventional pore former,polyvinylpyrrolidone(PVP),TPN-containing membranes exhibited superior structural integrity,less crystal formation at the CRASD bead surface,and greater extent of celecoxib ***-atom molecular dynamics analyses revealed that in the presence of TPN,intra-molecular bonding,crystal formation tendency,diffusion coefficient,and molecular flexibility of celecoxib were reduced,while intermolecular H-bonding was increased as compared to *** work suggests that selection of a pore former that promotes prolonged molecular separation within a nanoporous controlled release membrane structure may serve as an effective strategy to enhance amorphicity preservation inside CRASD.

关键词： Controlled release amorphous solid dispersion Poorly soluble drug Internal recrystallization Membrane-reservoir coated beads Molecular dynamics simulation Effect of pore formers Terpolymer nanogel Drug-polymer interactions

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Deciphering orbital hybridization in heterogeneous catalysis

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Electron 2024年第1期2卷 68-94页

作者： Xiaoyang Yue Lei Cheng Eszter baráth Rajenahally V.Jagadeesh Quanjun Xiang State Key Laboratory of Electronic Thin Film and Integrated Devices School of Electronic Science and EngineeringUniversity of Electronic Science and Technology of ChinaChengduChina'2Synergies in CatalysisCatalysis for Sustainable SynthesesLeibniz‐Institut für Katalyse e.V.RostockGermany'3Jiangsu Key Laboratory of New Power BatteriesJiangsu Collaborative Innovation Center of Biomedical Functional MaterialsSchool of Chemistry and Materials ScienceNanjing Normal UniversityNanjingChina

The catalytic coordinate is essentially the evolving frontier orbital interaction while feeding with catalytic materials and adsorbates under proper reaction *** heterogeneous catalytic reaction mechanism involves the initial adsorption and activation of reactants,subsequent intermediate transformation,final target product desorption,and regeneration of catalytic *** these catalytic processes,interaction modulations in terms of orbital hybridization/coupling allow an intrinsic control on both thermodynamics and *** charge transfer and redistribution,orbital splitting and rearrangement with specific orientation,and spin change and crossover pose a formidable challenge on mechanism elucidation;it is hard to precisely correlate the apparent activity and selectivity,let alone rational modulations on ***,deciphering the orbital couplings inside a catalytic round is highly desirable and the dependent descriptor further provides in-depth insights into catalyst design at the molecule orbital *** review hopes to provide a comprehensive understanding on orbital hybridizations,modulations,and correlated descriptors in heterogeneous catalysis.

关键词： catalysis catalyst design and prediction descriptors interactions orbital hybridization

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Automation of input data to discrete event simulation for manufacturing: A review

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International Journal of Modeling, Simulation, and Scientific Computing 2016年第1期7卷 93-119页

作者： Panagiotis barlas Cathal Heavey Enterprise Research Centre University of Limerick LimerickIreland

Discrete event simulation(DES)is a well-established decision support tool in modeling work flows in manufacturing ***,there are an amount of practical and financial obstacles that deter the employment of this technology in *** of the main weaknesses of operating DES is the costs spent on collecting and mapping input data from different enterprise data resources into a DES *** issue is the cost of integrating simulation applications with other manufacturing *** barriers hinder the automated input of data into DES models and as a result deter use of real-time DES in *** review presents the existing research studies in the literature that address the above issues,demonstrating in parallel the already implemented *** scope of this review is to provide an overview of the input data phase,focusing on its automation and motivating researchers to re-examine this phase by highlighting future research directions.

关键词： Discrete event simulation input data automation

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Catalysts for the hydrogen evolution reaction in alkaline medium:Configuring a cooperative mechanism at the Ag-Ag_(2)S-MoS_(2) interface

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Journal of Energy Chemistry 2022年第11期31卷 481-488,I0013页

作者： Avraham bar-Hen Simon Hettler Ashwin Ramasubramaniam Raul Arenal Ronen bar-Ziv Maya bar Sadan Department of Chemistry Ben-Gurion University of the NegevBeer-Sheva 8410501Israel Department of Chemistry Nuclear Research Center NegevP.O.Box 9001Beer-Sheva 84190Israel Laboratorio de Microscopías Avanzadas Universidad de Zaragoza50018 ZaragozaSpain Instituto de Nanociencia y Materiales de Aragon CSIC-U.de ZaragozaCalle Pedro Cerbuna 1250009 ZaragozaSpain Department of Mechanical and Industrial Engineering University of MassachusettsAmherstMA 01003United States ARAID Foundation 50018 ZaragozaSpain

Designing electrocatalysts for HER in alkaline conditions to overcome the sluggish kinetics associated with the additional water dissociation step is a recognized challenge in promoting the hydrogen *** this end,delicately tuning the atomic-scale structure and surface composition of nanoparticles is a common strategy and,specifically,making use of hybrid structures,can produce synergistic effects that lead to highly active ***,we present a core-shell catalyst of Ag@MoS_(2)that shows promising results towards the hydrogen evolution reaction(HER)in both 0.5 M H_(2)SO_(4)and 0.5 M *** this hybrid structure,the MoS_(2)shell is strained and defective,and charge transfer occurs between the conductive core and the shell,contributing to the electrocatalytic *** shelling process results in a large fraction of Ag_(2)S in the cores,and adjusting the relative fractions of Ag,Ag_(2)S,and MoS_(2)leads to improved catalytic activity and fast charge-transfer *** suggest that the enhancement of alkaline HER is associated with a cooperative effect of the interfaces,where the Ag(Ⅰ)sites in Ag_(2)S drive the water dissociation step,and the formed hydrogen subsequently recombines on the defective MoS_(2)*** study demonstrates the benefits of hybrid structures as functional nanomaterials and provides a scheme to activate MoS_(2)for HER in alkaline conditions.

关键词： Water splitting Core-shell Catalytic mechanism Electrocatalysis 2D materials

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A survey of open source data science tools

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International Journal of Intelligent Computing and Cybernetics 2015年第3期8卷 232-261页

作者： Panagiotis barlas Ivor Lanning Cathal Heavey Enterprise Research Centre University of LimerickLimerickIreland

Purpose–Data science is the study of the generalizable extraction of knowledge from *** includes a variety of components and develops on methods and concepts from many domains,containing mathematics,probability models,machine learning,statistical learning,computer programming,data engineering,pattern recognition and learning,visualization and data warehousing aiming to extract value from *** purpose of this paper is to provide an overview of open source(OS)data science tools,proposing a classification scheme that can be used to study OS data science ***/methodology/approach–The proposed classification scheme is based on general characteristics,project activity,operational characteristics and data mining *** authors then use the proposed scheme to examine 70 identified Open Source *** this the authors provide insight about the current status of OS data science tools and reveal the state-of-the-art ***–The features of 70 OS tools are recorded based on the criteria of the four group characteristics,general characteristics,project activity,operational characteristics and data mining *** results came from the analysis of these features and are recorded ***/value–The contribution of this survey is development of a new classification scheme for examination and study of OS data science *** parallel,this study provides an overview of existing OS data science tools.

关键词： Information retrieval Image processing Data Data mining Knowledge acquisition Genetic algorithms Data science Open source Data science tools

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Congenital H-type anovestibuler fistula

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World Journal of Gastroenterology 2003年第4期9卷 881-882页

作者： Mesut Yazlcl barlas Etensel Harun Gürsoy Sezen zklsaclk Department of Pediatric surgery Faculty of MedicineAdnan Menderes UniversityAydlnTurkey

The congenital H-type fistula between the anorectum and genital tract besides a normal anus is a rare entity in the spectrum of anorectal anomalies. We described a girl with an anovestibuler H-type fistula and left vulvar abscess. A 40-day-old girl presented symptoms after her parents noted the presence of stool at the vestibulum. On the physical examination, anus was in normal location and size, and had normal sphincter tone. A vestibuler opening was seen in the midline just below of the hymen. A fistulous communication was found between the vestibuler opening and the anus, just above the dentate line. There was a vulvar abscess which had a left lateral vulvar drainage opening 15 mm left lateral to the perineum. After the management of local inflammation and abscess, the patient was operated for primary repair of the fistula. A protective colostomy wasn′t performed prior the operation. A profuse diarrhea started after 5 hours of postoperation. After the diarrhea, a recurrent fistula was occurred on the second postoperative day. A divided sigmoid colostomy was performed. 2 months later, and anterior sagital anorectoplasty was reconstructed and colostomy was closed 1 month later. Various surgical techniques with or without protective colostomy have been described for double termination repair. But there is no consensus regarding surgical management of double termination.

关键词： Colostomy Female Humans Infant, Newborn Reconstructive Surgical Procedures Rectovaginal Fistula Recurrence Treatment Outcome

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