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CFD study of non-premixed swirling burners: Effect of turbulence models

Chinese Journal of Chemical Engineering 2020年第4期28卷 1029-1038页

作者： Erfan khodabandeh Hesam Moghadasi Mohsen Saffari Pour Mikael Ersson Par G.Jonsson marc A.Rosen Alireza Rahbari Department of Mechanical Engineering Amirkabir University of TechnologyTehranIran School of Mechanical Engineering Department of Energy ConversionIran University of Sciesnce and Technology(IUST)Narmak 16846-13114TehranIran Department of Mechanical Engineering Shahid Bahonar University of KermanKermanIran Division of Processes Department of Materials Science and EngineeringKTH Royal Institute of TechnologyBrinellvägen 23SE-10044 StockholmSweden Faculty of Engineering and Applied Science University of Ontario Institute of TechnologyOshawaOntarioL1H 7K4Canada Department of Mechanical Engineering Shahid Rajaee Teacher Training University(SRTTU)TehranIran Research School of Engineering The Australian National UniversityCanberraACT 2601Australia

This research investigates a numerical simulation of swirling turbulent non-premixed *** effects on the combustion characteristics are examined with three turbulence models:namely as the Reynolds stress model,spectral turbulence analysis and Re-Normalization *** addition,the P-1 and discrete ordinate(DO)models are used to simulate the radiative heat transfer in this *** governing equations associated with the required boundary conditions are solved using the numerical *** accuracy of this model is validated with the published experimental data and the comparison elucidates that there is a reasonable agreement between the obtained values from this model and the corresponding experimental *** different models proposed in this research,the Reynolds stress model with the Probability Density Function(PDF)approach is more accurate(nearly up to 50%)than other turbulent models for a swirling flow *** the effect of radiative heat transfer model,it is observed that the discrete ordinate model is more precise than the P-1 model in anticipating the experimental *** model is able to simulate the subcritical nature of the isothermal flow as well as the size and shape of the internal recirculation induced by the swirl due to combustion.

关键词： Computational Fluid Dynamics(CFD) Turbulent combustion Non-premixed flames Large eddy simulations Radiative heat transfer model Modeling validation

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The sooty moulds

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Fungal Diversity 2014年第3期66卷 1-36页

作者： Putarak Chomnunti Sinang Hongsanan Begoña Aguirre-Hudson Qing Tian Derek Peršoh Manpreet k.Dhami Aisyah S.Alias Jianchu Xu Xingzhong Liu marc Stadler kevin D.Hyde key Laboratory for Plant Biodiversity and Biogeography of East Asia Kunming Institute of BotanyChinese Academy of ScienceKunming 650201YunnanChina Institute of Excellence in Fungal Research and School of ScienceMae Fah Luang University333 M.1 ThasudMuangChiang Rai 57100Thailand Jodrell Laboratory Royal Botanic GardensKew RichmondSurrey TW93DSUK Department of Mycology University of BayreuthUniversitätsstraße 3095440 BayreuthGermany Plant Health and Environment Laboratory Ministry for Primary IndustriesP O Box 2095Auckland 1140New Zealand Institute of Ocean and Earth Sciences(IOES) C308Institute of Postgraduate Studies BuildingUniversity of Malaya50603 Kuala LumpurMalaysia State key Laboratory of Mycology Institute of MicrobiologyChinese Academy of SciencesNo3 Park 1Chaoyang DistrictBeijing 100101People’s Republic of China Department Microbial Drugs Helmholtz-Centre for Infection Research and Technical University of BraunschweigInhoffenstrasse 738124 BraunschweigGermany World Agroforestry Center East and Central AsiaKunming 650201YunnanChin

Sooty moulds are a remarkable,but poorly understood group of *** coat fruits and leaves superficially with black mycelia,which reduces photosynthesis rates of host *** researchers have,however,tried to quantify their economic *** moulds have been well-studied at the morphological level,but they are poorly represented in a natural classification based on *** are presently known in Antennulariellaceae,Capnodiaceae,Chaetothyriaceae,Coccodiniaceae,Euantennariaceae,Metacapnodiaceae and Trichomeriaceae and several miscellaneous ***,molecular data is available for only five *** sooty mould colonies comprise numerous species and thus it is hard to confirm relationships between genera or sexual and asexual *** studies need to obtain single spore isolates of species to test their phylogenetic affinities and linkages between *** generation sequencing has shown sooty mould colonies to contain many more fungal species than expected,but it is not clear which species are dominant or active in the *** are more common in tropical,subtropical and warm temperate regions and thus their prevalence in temperate regions is likely to increase with global *** moulds are rarely parasitized by fungicolous taxa and these may have biocontrol *** apparently grow in extreme environments and may be *** needs testing as xerophilic taxa may be of interest for industrial *** moulds grow on sugars and appear to out-compete typical“weed”fungi and *** may produce antibiotics for this purpose and their biochemical potential for obtaining novel bioactive compounds for medical application is underexplored.

关键词： Antibiotics Capnodiales Chaetothyriales Global warming Life cycle Phylogeny Xerophiles

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Evidence of the Albo-Cenomanian Unconformity Using Chemical Elements Case Study of Sediments from the Eastern Abidjan Margin

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Open Journal of Geology 2023年第10期13卷 1054-1068页

作者： Chia Marie Reine kokoa Samassy Rokyatou Lassey Lou Coulibaly Sougo Aoua Affian kouadio marc Ephrem Allialy UFR-STRM Félix Houphou&#235t-Boigny University of Abidjan Abidjan C&#244te d’Ivoire UFR-ARHAI San Pedro University of C&#244te d’Ivoire San Pedro C&#244te d’Ivoire

Sedimentological and chemostratigraphical studies using accessory elements on 322 samples of cuttings from oil wells located in the submerged sedimentary basin (offshore) of Côte d’Ivoire. This basin covered the chronostratigraphic interval from the Upper Albian to the top of the Maastrichtian. The aim of this study was to determine the major accident, the Albo-Cenomanian unconformity, using chemical elements. To achieve this goal, we had to count the accessory elements glauconite, pyrite and carbonaceous debris, and identify all the chemical elements present in each cuttings sample. The results clearly indicate that: the sediments are essentially composed of carbonaceous debris and pyrite, with a high potassium content for sediments dating from the Abian period;and glauconite, carbonaceous debris, pyrite, and a sharp decrease in potassium content for sediments dating from the Cenomanian to the Maastrichtian period. Threshold values for ratios of source-indicating chemical elements (Zr, Ti, Y, Th) and paleoenvironmental elements (k, Rb, Mg, Al,) highlighted the MS1 and MS2 mega-sequences in the study area. The difference observed in the threshold values of these ratios can be explained by changes in sedimentary dynamics. The depositional environment varies from an inner continental shelf with strong littoral influence (Upper Albian) to an increasing subsidence outer continental shelf (Cenomanian-k/Pg boundary).

关键词： Sedimentological Chemostratigraphical Margin Abidjan Côte d’Ivoire

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Prevalence and Risk Factors of Gastrointestinal Parasitic Infections in Small Ruminants in the Greek Temperate Mediterranean Environment

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Open Journal of Veterinary Medicine 2012年第1期2卷 25-33页

作者： Vaia kantzoura marc k. kouam Helen Theodoropoulou Haralambos Feidas Georgios Theodoropoulos Department of Anatomy and Physiology of Farm Animals Faculty of Animal Science and Aquaculture Department of Anatomy and Physiology of Farm Animals Faculty of Animal Science and Aquaculture Agricultural University of Athens Athens Greece Department of Home Economics and Ecology Harokopio University Athens Greece Department of Meteorology and Climatology School of Geology Aristotle University of Thessaloniki Thessaloniki Greece

Gastrointestinal (GI) parasitic infections of sheep and goats were investigated in 69 farms located in Thessaly region of Greece, characterized by temperate Mediterranean climate, during two consecutive seasons. A total of 557 fecal samples were collected. Helminth eggs were detected in 44 (7.9%) samples. Strongyle-type eggs were found in 19 (3.4%) samples, Nematodirus spp. eggs in 6 (1.1%) samples, Trichuris spp. eggs in 16 (2.9%) samples, Fasciola hepatica in 3 (0.5%) samples, and Dicrocoelium dendriticum in 1 (0.2%) sample. Coccidian oocysts were found in 36 (6.5%) samples. Risk factors related to animal and farmer status, farm and pasture management, and environmental factors derived by satellite data were examined for their association with the prevalence of helmith infections. A logistic regression model showed that the educational level of farmers and the elevation of farm location were associated with helminth

关键词： Risk Factors Gastrointestinal Parasites Sheep Goats Farm Greece

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Tracing the Origin of Metasedimentary Rocks in the Tortiya Diamond Region (Northern Côte d’Ivoire)

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Open Journal of Geology 2023年第12期13卷 1271-1290页

作者： Tessia Miryam Adingra Martial Pohn koffi koffi Yao Augustin Houssou Nestor Allialy marc Ephrem kouassi Brice Roland Félix Houphouë t-Boigny University of Abidjan Abidjan C&#244te d’Ivoire Peleforo Gon Coulibaly University of korhogo Korhogo C&#244te d’Ivoire

Metasedimentary rocks from the Tortiya diamondiferous region (northern Côte d’Ivoire), located in the Ivorian Paleoproterozoic domain, were analyzed with the aim of identifying their different petrographic facies, constraining their provenance and tectonic environment, and assessing the effects of sedimentary processes and weathering on the signature of their source rocks. These analyses were carried out with a view to helping trace the origin of Tortiya diamonds, which are generally hosted in these metasediments. Major and trace element geochemical data reveal that these samples are characterized by negative Eu anomaly values, low to moderate weathering index values and a high compositional variation index (ICV). These results led to the definition of these metasediments as immature sediments potentially originating from rapid erosion and sediment deposition from local sources. Chemical alteration index (CIA) values and Al2O3-(CaO* + Na2O)-k2O composition space suggest low to medium degrees of meteoric alteration of the parent rock. These rocks therefore show poorly differentiated compositions from the parent rock and poor sediment sorting. Geochemical data and ratios of immobile elements, e.g. Al2O3/TiO2, Cr/Th, Eu/Eu* and (La/Yb)n, indicate that the clastic materials derive mainly from felsic to intermediate sources. Sedimentary tectonic discrimination diagrams demonstrate that most of the samples from the Tortiya diamond-bearing region were deposited on an active continental margin or in a continental arc-island environment. Although this region has a long history of diamond mining, its petrogenesis remains unresolved, and this petrogeochemical work is a step towards initiating scientific research in the area.

关键词： Petrography Geochemistry Metasediments Tortiya Ivory Coast

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“Macrobot”:An Automated Segmentation-Based System for Powdery Mildew Disease Quantification

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Plant Phenomics 2020年第1期2卷 334-346页

作者： Stefanie Lück marc Strickert Maximilian Lorbeer Friedrich Melchert Andreas Backhaus David kilias Udo Seiffert Dimitar Douchkov Leibniz Institute of Plant Genetics and Crop Plant Research(IPk) Correnstr.306466 SeelandGermany Physics Institute II University of GiessenHeinrich-Buff-Ring 1635392 GiessenGermany Julius kühn Institute for National and International Plant Health Messeweg 11/1238104 BraunschweigGermany Fraunhofer Institute for Factory Operation and Automation(IFF) Sandtorstr.2239106 MagdeburgGermany

Managing plant diseases is increasingly difficult due to reasons such as intensifying the field production,climatic change-driven expansion of pests,redraw and loss of effectiveness of pesticides,rapid breakdown of the disease resistance in the field,and other *** substantial progress in genomics of both plants and pathogens,achieved in the last decades,has the potential to counteract this negative trend,however,only when the genomic data is supported by relevant phenotypic data that allows linking the genomic information to specific *** have developed a set of methods and equipment and combined them into a“Macrophenomics facility.”The pipeline has been optimized for the quantification of powdery mildew infection symptoms on wheat and barley,but it can be adapted to other diseases and host *** Macrophenomics pipeline scores the visible powdery mildew disease symptoms,typically 5-7 days after inoculation(dai),in a highly automated *** system can precisely and reproducibly quantify the percentage of the infected leaf area with a theoretical throughput of up to 10000 individual samples per day,making it appropriate for phenotyping of large germplasm collections and crossing populations.

关键词： linking pesticides typically

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Anal squamous cell carcinoma: An evolution in disease and management

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World Journal of Gastroenterology 2014年第36期20卷 13052-13059页

作者： marc C Osborne Justin Maykel Eric k Johnson Scott R Steele University of Minnesota Minneapolis MN55415 United States University of Massachusetts Memorial Medical Center Worcester MA 01609 United States Department of Surgery Madigan Army Medical Center Tacoma WA 98431 United States

Anal cancer represents less than 1% of all new cancers diagnosed annually in the United States. Yet, despite the relative paucity of cases, the incidence of anal cancer has seen a steady about 2% rise each year over the last decade. As such, all healthcare providers need to be cognizant of the evaluation and treatment of anal squamous cell carcinoma. While chemoradiation remains the mainstay of therapy for most patients with anal cancer, surgery may still be required in recurrent, recalcitrant and palliative disease. In this manuscript, we will explore the diagnosis and management of squamous cell carcinoma of the anus.

关键词： Anal cancer Squamous cell cancer Nigro protocol An

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铅蓄冷材料的二级脉冲管制冷机研究

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工程热物理学报 2007年第Z1期28卷 33-36页

作者：杨鲁伟 marc Dietrich Guenter Thummes 中国科学院理化技术研究所北京100080 德国吉森大学应用物理研究所 d35392

采用多级方案是高频脉冲管制冷机获得低于20 k以下制冷温度的主要方法,以不锈钢金属丝网为蓄冷材料的二级高频脉冲管制冷机,实验已经达到了20 k以下温度。理论上讲,由于热容大,以铅为主的蓄冷材料比不锈钢更适合40～10 k温区工作,这在... 详细信息

采用多级方案是高频脉冲管制冷机获得低于20 k以下制冷温度的主要方法,以不锈钢金属丝网为蓄冷材料的二级高频脉冲管制冷机,实验已经达到了20 k以下温度。理论上讲,由于热容大,以铅为主的蓄冷材料比不锈钢更适合40～10 k温区工作,这在低频回热制冷机中得到了证明。本文介绍了我们采用不同铅球和铅网为低温蓄冷材料的研究结果。实验表明,小铅球对于高频脉冲管制冷机是不很合适的,导致制冷温度的明显升高。镀铅的不锈钢丝网和已有不锈钢丝网的性能相似,可进一步深入研究。该研究对于20 k以至更低温度的高频回热制冷机研究有一定的借鉴意义。

关键词：铅蓄冷材料二级高频脉冲管实验模拟

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大尺寸单级高频脉冲管制冷机研究

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工程热物理学报 2008年第1期29卷 16-18页

作者：杨鲁伟 marc Dietrich Guenter Thummes 中科院理化技术研究所北京100080 德国吉森大学应用物理研究所德国D-35392

本文简要介绍近年来在德国吉森大学开展的大尺寸单级高频脉冲管制冷机研究的主要进展。该大尺寸脉冲管已能达到较低的制冷温度并在60～80 k获得较高的效率,在国际上处出领先水平。文中首先介绍了理论模拟结果,然后介绍实验存在的问题及... 详细信息

本文简要介绍近年来在德国吉森大学开展的大尺寸单级高频脉冲管制冷机研究的主要进展。该大尺寸脉冲管已能达到较低的制冷温度并在60～80 k获得较高的效率,在国际上处出领先水平。文中首先介绍了理论模拟结果,然后介绍实验存在的问题及其改进,特别是提出了一个改进回热器温度不均匀分配的方案,得到了很好的验证。

关键词：大尺寸脉管模拟实验回热器温度不均匀

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A township-level assessment of forest fragmentation using morphological spatial pattern analysis in Qujing,Yunnan Province,China

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Journal of Mountain Science 2021年第12期18卷 3125-3137页

作者： HUANG Xiao-yuan YE Yuan-hui ZHANG Zhuo-ya YE Jiang-xia GAO Jie marc BOGONOVICH ZHANG Xing School of Geography and Ecotourism(SGE) Southwest Forestry University(SWFU)Kunming 650224China Peking university No.5 Yiheyuan Road Haidian DistrictBeijing 100871China China Agricultural University No.17 Qinghua Road EastHaidian DistrictBeijing 100083China Hebei university of environmental Engineering No.8 Jingang DistrictQinhuangdao 066102China

Forest fragmentation is an integral part of global *** forest fragmentation patterns and dynamics are of great significance for maintaining ecosystem *** are great differences in the interference of natural and human factors on forests in different towns of mountainous cities,and the characteristics of forest fragmentation are also obviously *** fragmentation has been broadly studied,yet,it remains poorly understood at the township-scale within mountainous *** this study,the spatial form of forest landscape and forest fragmentation modes of towns were examined in Qujing City,Yunnan Province,China for the years of 2006 and 2016,relying heavily on the morphological spatial pattern analysis(MSPA)and k-means clustering *** in 2016 showed that the forest landscape morphology of Qujing could be divided into seven classes:core,perforation,islet,bridge,edge,branch and ring;with landscape areas of 41.94%,1.22%,7.04%,11.12%,23.26%,11.74%and 3.68%*** with 2006,the changes of landscape area were 1.71%,0.02%,0.30%,1.65%,0.20%,0.19%and 0.05%*** townships in Qujing varied significantly in their landscape fragmentation patterns,and these patterns were spatially *** forest landscape forms have positive spatial correlations and *** forest fragmentation modes of towns can be divided into four types:Low anthropogenic towns,high anthropogenic towns,complex terrain towns and gentle terrain *** ways of human activities play a decisive role in forest landscape *** expansion of construction land and agricultural land intensifies forest fragmentation;however,man-made orderly and planned ecological restoration will greatly improve the forest coverage and improve the spatial form of urban forest landscape.

关键词： Forest fragmentation Morphological spatial pattern analysis Morphological type China

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