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CFD predictions for hazardous area classification

Chinese Journal of Chemical Engineering 2019年第1期27卷 21-31页

作者： Andrey Oliveira de Souza Aurélio Moreira Luiz Ant?nio Tavernard Pereira Neto Ant?nio Carlos Brandao de araujo Heleno Bispo da silva Sidinei Kebler da silva Jose Jailson Nicacio Alves Federal Institute of Education Science and Technology of Paraiba Petrobras-Petróleo Brasileiro S.A. Federal University of Campina Grande

This study aimed to describe a Computational Fluid Dynamics(CFD) procedure using the ANSYS CFX software 16.1 and Design of Experiments for the determination of volume and extension of explosive atmospheres due to fugitive emissions of flammable *** multidimensional statistical sampling technique Latin Hypercube was used, which defined 100 simulations of random methane gas leak *** CFD model proved to be robust in predicting the extension and volume of the explosive atmosphere for orifice diameters from 0.1 to2.5 mm, pressure from 0.1 MPa to 12 MPa and temperatures from 0 ℃ to 400 ℃.It was found that the calculation domain must be parameterized 8 m in length for each millimeter of the diameter of the source of release to ensure the *** order not to lose precision for very small diameters, the mesh was parameterized with 50 elements along the orifice *** was proved that gravity does not influence the extension and volume of the explosive atmosphere at sonic *** deviation from the ideal gas behavior in the reservoir,achieved by applying the Soave–Redlich–Kwong equation of state, also has not significantly influenced the extension and volume of the explosive *** results showed that the size of the explosive atmosphere varies directly with the diameter of the source emission and reservoir pressure, and inversely with the temperature of the *** diameter of the source is the parameter that has the major effect on the extension of the explosive atmosphere, followed by the pressure and lastly the temperature of the reservoir.

关键词： Computational Fluid Dynamics Computer simulation Safety Fugitive emissions Classified area Flammable gas cloud

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Influence of Sugarcane Bagasse Fiber Size on Biodegradable Composites of Thermoplastic Starch

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Journal of Renewable Materials 2018年第2期6卷 176-182页

作者： Bruno henrique dos Santos Karen de Souza do Prado Asaph Armando Jacinto Marcia Aparecida da silva Spinace Federal University of ABC Center of Natural and Human SciencesAv.dos Estados5001Santa Terezinha09.210-170 Santo AndréSão PauloBrazil

Although thermoplastic starch(TPS)is biodegradable,its low mechanical resistance limits its wide *** bagasse(SB)fibers can be used as reinforcement in TPS matrix composites,but the influence of fiber size on the properties of the composite is still *** this study,TPS composites reinforced with SB short fibers of four sizes were processed and characterized in order to analyze the influence of fiber size on the mechanical properties of the TPS/SB *** was observed that the interaction between fiber and matrix was good and optimized when the fibers are sifted in sieves between 30 and 50 mesh,obtaining fibers with average length of 1569±640μm and average diameter of 646±166μ*** these composites,increases of more than 660%in the modulus and more than 100%in the maximum tension were verified when compared to the pure TPS.

关键词： Sugarcane bagasse thermoplastic starch composite fiber size

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Energetic-protein supplementation in the last 60 days of gestation improves performance of beef cows grazing tropical pastures

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Journal of Animal Science and Biotechnology 2018年第1期9卷 208-216页

作者： Aline Gomes da silva Mário Fonseca Paulino Edenio Detmann henrique Jorge Fernandes Lincoln da silva Amorim Román Enrique Maza Ortega Victor Valério de Carvalho Josilaine Aparecida da Costa Lima Felipe henrique de Moura Mariana Benevides Monteiro Jéssika Almeida Bitencourt Universidade Federal de Vicosa VicosaMinas Gerais 36570-000Brazil Universidade Federal de Mato Grosso do Sul Campo GrandeMato Grosso do Sul 79074-460Brazil Universidade Estadual de Mato Grosso do Sul AquidauanaMato Grosso do Sul 79200-000Brazil Biotran Biotecnologia e Treinamento em Reproducao Animal AlfenasMinas Gerais 37130-000Brazil Universidade Federal do Acre Rio BrancoAcre 69920-900Brazil

Background： Nutrition is one of the most important factors that affect animal performance, and it therefore also impacts on financial results in beef systems. In this way, finding the best strategy for feeding supplements is of paramount importance. Aiming to evaluate the effect of supplement feeding strategies for beef cows in the last third of gestation, two experiments were conducted. In Experiment 1, 35 pregnant Nellore cows were assigned to a completely randomized design with four treatments： control, which received no supplement; supplementation for the last 30 d of gestation（30-d; 3.0 kg/d）; supplementation for the last 60 d of gestation（60-d; 1.5 kg/d）; or supplementation for the last 90 d of gestation（90-d; 1.0 kg/d）. All supplemented treatments received the same total amount of supplement throughout the experiment： 90 kg（20% of crude protein）. A second experiment（Experiment 2） was delineated to evaluate the effects of the amounts offered in Experiment 1 on intake and metabolism. Four multiparous pregnant Nellore cows were assigned to a 4 × 4 Latin square design, with periods of15 d ***： There was a linear effect of the number of days of supplementation on calving body weight（BW; P 〈 0.05）and a quadratic effect on BW change from parturition to d 31 post-calving（P 〈 0.05）, with cows on the 60-d strategy losing less BW post-calving. No difference was found in offspring birth BW（P 〉 0.10）. A significant linear effect on interval from parturition to conception（P 〈 0.05） was observed, with the highest calving to conception interval being observed in the 90-d strategy. The level of supplementation did not affect forage intake or neutral detergent fiber digestibility（P 〉 0.10）. Nitrogen excreted through urine tended to increase linearly with the level of supplementation（P 〈 0.10）.Conclusion： Providing 1.5 kg of supplement during the last 60 d of gestation improves cow performance after calving, reducing the magnitude of BW lost, and reduces the number of

关键词： Flushing Nutrition Parturition Reproduction

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Development of Junction Elements from Study of the Bionics

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Journal of Bionic Engineering 2007年第1期4卷 41-46页

作者： Wilson Kindlein Junior Luis henrique Alves Cndido André Canal Marques Sandra Souza dos Santos Maurício da silva Viegas Laboratory of Design and Material Selection-LdSM-Materials Department (DEMAT) School of Engineering–EE Federal University of Rio Grande do Sul-Brazil-UFRGS Brazil

The applications of bionic methodology developed by the Laboratory of Design and Material Selection as basis in the creation of junction elements were demonstrated. These elements favor the application of Ecodesign in reference to the effectiveness of product dismount aiming the reduction of ambient impact in all its phases of use. The creation, the development and the confection of new junction elements were described, and case studies of new products developed specifically with this purpose were presented.

关键词： bionics Ecodesign junction elements

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A Bidimensional Finite Element Study of Crack Propagation in Austempered Ductile Iron

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Computers, Materials & Continua 2023年第11期77卷 1411-1424页

作者： Gustavo von Zeska de França Roberto Luís de Assumpção Marco Antonio Luersen Carlos henrique da silva Department of Mechanical Engineering Federal University of Technology–ParanáCuritiba81280-340Brazil

Austempered ductile iron(ADI)is composed of an ausferritic matrix with graphite nodules and has a wide range of applications because of its high mechanical strength,fatigue resistance,and wear resistance compared to other cast *** amount and size of the nodules can be controlled by the chemical composition and austenitizing *** the nodules have lower stiffness than the matrix and can act as stress concentrators,they influence crack ***,the crack propagation mechanism in ADI is not yet fully *** this study,we describe a numerical investigation of crack propagation in ADIs subjected to cyclic *** numerical model used to calculate the stress intensity factors in the material under the given conditions is built with the aid of Abaqus commercial finite element *** crack propagation routine,which is based on the Paris law,is implemented in *** results of the simulation show that the presence of a nodule generates a shear load on the crack ***,even under uniaxial tensile loading,the presence of the nodule yields a non-zero stress intensity factor in mode II,resulting in a deviation in the crack propagation *** is the primary factor responsible for changing the crack propagation direction towards the *** the parameters,for example,increasing the nodule size or decreasing the distance between the nodule and crack tip,can intensify this *** simulations comparing two different ADIs with the same graphite fraction area,the crack in the material with more nodules reaches another nodule in a shorter propagation time(or shorter number of cycles).This suggests that the high fatigue resistance observed in ADIs may be correlated with the number of nodules intercepted by a crack and the additional energy required to nucleate new *** summary,these findings contribute to a better understanding of crack propagation in ADIs,provide insights into the relationship between the presence

关键词： Austempered ductile iron(ADI) fatigue crack propagation graphite nodule

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Engineering Improved Photosynthesis in the Era of Synthetic Biology

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Plant Communications 2020年第2期1卷 1-17页

作者： Willian Batista-silva Paula da Fonseca-Pereira Auxiliadora Oliveira Martins Agustin Zsogon Adriano Nunes-Nesi Wagner L.araujo Departamento de Biologia Vegetal Universidade Federal de Vic¸osaVic¸osaMinas Gerais 36570-900Brazil

Much attention has been given to the enhancement of photosynthesis as a strategy for the optimization of crop *** traditional plant breeding is most likely reaching a plateau,there is a timely need to accelerate improvements in photosynthetic efficiency by means of novel tools and biotechnological *** emerging field of synthetic biology offers the potential for building completely novel pathways in predictable directions and,thus,addresses the global requirements for higher yields expected to occur in the 21st ***,we discuss recent advances and current challenges of engineering improved photosynthesis in the era of synthetic biology toward optimized utilization of solar energy and carbon sources to optimize the production of food,fiber,and fuel.

关键词： photosynthesis synthetic biology genetic engineering yield improvement targeted manipulation

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Glutamine prevents oxidative stress in a model of mesenteric ischemia and reperfusion

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World Journal of Gastroenterology 2014年第32期20卷 11406-11414页

作者： Gilmara Pandolfo Zabot Gustavo Franco Carvalhal Norma Possa Marroni Renata Minuzzo Hartmann Vinícius Duval da silva henrique Sarubbi Fillmann Department of Surgery School of Medicine Pontifical Catholic University of Rio Grande do Sul Porto Alegre RS 90610-000 Brazil Department of Gastroenterology School of Medicine Federal University of Rio Grande do Sul Porto Alegre RS 90035-903 Brazil Department of Pathology School of Medicine Pontifical Catholic University of Rio Grande do SulPorto Alegre RS 90610-000 Brazil

AIM: To evaluate preventative effects of glutamine in an animal model of gut ischemia/reperfusion (I/R).

关键词： Ischemia-reperfusion Glutamine Lipid peroxidation Superoxide dismutase Nuclear factor-kappa beta Interleukin 6

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Hydrodynamics and suspended particulate matter retention in macrotidal estuaries located in Amazonia-semiarid interface(Northeastern-Brazil)

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International Journal of Sediment Research 2020年第4期35卷 417-429页

作者： Vinicius henrique Maciel dos Santos Francisco Jose da silva Dias Audalio Rebelo Torres Romulo araujo Soares Lais Costa Terto Antonio Carlos Leal de Castro Ricardo Luvizotto Santos Marco Valerio Jansen Cutrim Laboratorio de Hidrodinamica Costeira Estuarina e de Aguas Interiores (LHiCEAI) Do Programa de Pos-Graduacao Em Oceanografia (PPGOceano) da Universidade Federal Do Maranhao (UFMA)Cidade Universitaria Dom Delgado Laboratorio de Ictiologia (LabIctio) da Universidade Federal Do Maranhao (UFMA) Cidade Universitaria Dom Delgado Laboratorio de Ecotoxicologia (LabEcotox) Do Programa de Pos-Graduacao Em Oceanografia (PPGOceano) da Universidade Federal Do Maranhao (UFMA) Cidade Universitaria Dom Delgado Laboratorio de Ficologia (LabFic) Do Programa de Pos-Graduacao Em Oceanografia (PPGOceano) da Universidade Federal Do Maranhao (UFMA) Cidade Universitaria Dom Delgado

The aim of the current study was to determine the nature of the seasonal variability of the Suspended Particulate Matter(SPM) fluxes from the drainage basin to the estuary in a macrotidal region(Northeastern Brazil),and the estuarine response to a seawater intrusion regarding sediment deposition,which will support the understanding of the global transport of materials at the continent-ocean *** structure data was acquired using a Conductivity,Temperature,and Depth(CTD) probe with a sampling frequency of 4 *** particulate material was measured by gravimetric measurements applied to exact filtered volume *** outflows were measured through the use of an Acoustic Doppler Current Profiler(ADCP) with frequency of 1.5 *** horizontal thermal and saline gradients varied from warmer and less saline waters(2014) to cooler and saline waters(2015).The gradient behavior when linked to volume transport and SPM flows,suggests a minimization of the fluvial flows in 2015,easing the advance of coastal water(CW) towards the inner estuary,leading to an inversion of the baroclinic pressure *** bottom saline front,generated by the entrance of coastal water masses,caused an increase in SPM concentrations due to increased fluid density,resuspension of previously deposited sediment,and erosion of *** concentrations of SPM indicate higher volume transport suggesting a hydraulic barrier due to the change/inversion of the baroclinic pressure gradient,resulting in water and material *** deposition was observed during neap tide,while during spring tide the material is resuspended,increasing the concentration,generating cycles of deposition and erosion during the neap-spring *** sediment in suspension that reach the estuary,even with low fluvial volume,stay in this environment forming new islands because of *** deposition rates or sediment cycling,if generated by the hydraulic barrier,may indicate that the flo

关键词： Brazilian Amazonia Materials discharges Macrotidal estuaries Freshwater percentage Residence time

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Updatism:Pandemic and Historicities in the Never-Ending 2020

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Journal of Foreign Languages and Cultures 2021年第2期5卷 90-102,155,156页

作者： Mateus henrique de Faria Pereira Valdei Lopes de araujo Federal University of Ouro Preto

In this essay we demonstrate that the present and the future are also history and must be dimensions of *** that,we return to episodes from our book Alamanac of COVID-19 and some of our readings of key moments of this year in order to reflect on what we have called updatist *** some moments we use the retrospective as a *** others we choose to maintain the anachronistic effect of certain passages in order to highlight the contingent aspect of all representation of *** divided the text into three main *** first presents the most recent shifts in the hypothesis about an updatist *** the second,we gathered some episodes from 2020 as a way to elucidate what we are calling updatism in its relations with politics and history,and finally we point out preliminary paths for action with counter-updatist effects.

关键词： updatism COVID-19 historicity politics time

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Biochar influences the cane fields’microbiota and the development of pre-sprouted sugarcane seedlings

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Waste Disposal and Sustainable Energy 2023年第1期5卷 75-88页

作者： Bruna Cristina Pinto Adriana Barboza Alves Osania Emerenciano Ferreira Gustavo henrique Gravatim Costa Magno Andréde Oliveira Augusto Cesar da silva Bezerra Alan Rodrigues Teixeira Machado Postgraduate Program in Environmental Sciences State University of Minas GeraisFrutal UnityFrutalMinas Gerais38202-436Brazil Department of Agricultural and Biological Sciences State University of Minas GeraisFrutal UnityFrutalMinas Gerais38208-436Brazil Postgraduate Program in Geotechnical Engineering Federal University of Ouro PretoOuro PretoMinas Gerais35400-000Brazil Department of Transport Engineering Federal Center for Technological Education of Minas GeraisBelo HorizonteMinas Gerais30421-169Brazil Department of Exact Sciences State University of Minas GeraisJoão Monlevade UnityJoão MonlevadeMinas Gerais35930-314Brazil

This research investigates the soil conditioning effect of sugar cane fields with biochar produced from sugarcane *** influence on the physicochemical and microbiological conditions of the soil and the agronomic performance of sugarcane seedlings was *** this end,the biochar from sugarcane bagasse was produced by pyrolysis in a double drum oven and mixed with soil at rates of 0,1%,3%,and 5%(in weight).The experiment was installed in a greenhouse with two evaluation periods(30 days and 60 days)and five *** pot received a pre-sprouted cane seedling,and the analysis of colony-forming units(bacteria and fungi),physicochemical characteristics of the soil,and growth and development of sugarcane were performed per *** biochar showed a high fixed carbon content(72%)and a specific surface area estimated by the adsorption of methylene blue of 50 m2 g−***,its structure is porous and contains important nutrients(e.g.,CaO,K2O,and P2O5).In the periods evaluated,the applications of the 3%and 5%(in weight)rates of biochar reduced most of the soil fertility ***,the chemical analyses indicated that the sugarcane field soil collected already possessed high *** microbiota was influenced,but only the application of the 3%(in weight)rate at 60 days after planting showed a significant positive effect on the number of bacteria forming units,with an increase of approximately 385%.On the other hand,no significant positive effect on sugarcane development was ***,biochar application in high-fertility sugarcane plantation soil did not result in gains for sugarcane development in the periods evaluated.

关键词： Soil Biometry Microbiology Double drum oven Biochar

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