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Numerical simulation of a Liquid Propellant Rocket Motor

Journal of Thermal science 2001年第1期10卷 83-86页

作者： Nicolas M.C. salvador, Marcelo M. Morales, Carlos E.s.s. Migueis, Demetrio bastos-Netto (INPE - National Institute for space Research, Rod. Presidente Dutra km 40, Cachoeira Paulista, sP, Brazil 12630-000., e-mail:demetrio@yabae,cptec.inpe.br) INPE - National Institute for space Research Cachoeira Paulista SP Brazil

This work presents a numerical simulation of the flow field in a liquid propellant rocket engine chamber and exit nozzle using techniques to allow the results to be taken as starting points for designing those propulsive systems. This was done using a Finite Volume method simulating the different flow regimes which usually take place in those systems. As the flow field has regions ranging from the low subsonic to the supersonic regimes, the numerical code used, initially developed for commpressible flows only, was modified to work proficiently in the whole velocity range. It is well known that codes have been developed in CFD, for either compressible or incompressible flows, the joint treatment of both together being complex even today, given the small number of. references available in this area. Here an existing code for compressible flow was used and primitive variables, the pressure, the Cartesian components of the velocity and the temperature instead of the conserved variables were introduced in the Euler and Navier-stokes equations. This was done to penult the treatment at any Mach number. Unstructured meshes with adaptive refinements were employed here. The convective terms were treated with upwind first and second order methods. The numerical stability was kept with artificial dissipation and in the spatial coverage one used a five stage Runge-Kutta scheme for the Fluid Mechanics and the VODE (Value of Ordinary Differential Equations) scheme along with the Chemkin II in the chemical reacting solution. During the development of this code simulating the flow in a rocket engine, comparison tests were made with several different types of internal and external flows, at different velocities, seeking to establish the confidence level of the techniques being used. These comparisons were done with existing theortical results and with other codes already validated and well acceptal by the CFD community.

关键词： numerical ximulation liquid propellant rocket CFD.

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Roux-en-Y gastric bypass remains as the reference technique for morbid obesity

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中华肥胖与代谢病电子杂志 2017年第1期3卷 1-6页

作者： Almino C Ramos Eduardo L. s. bastos Gastro-Obeso-Center Advanced Institute Sao Paulo Brazil

Overweight and obesity has more than doubled in the last 30 years, affecting people worldwide and bringing a high morbidity, mortality, and cost of treatment of obesity-related diseases[1-2]. Bariatric surgery has been the most effective way for morbidly obese patients, with a longstanding weight loss and improvement or resolution of comorbidities, which is clearly better in comparison with clinical management[3-6]. Over the last decades, there have been several technical options to treat morbid obesity surgically, and the Roux-en-Y gastric bypass (RYGB) has survived the time sieve and be considered as referral procedure.

关键词： Bariatric surgery Roux-en-Y gastric bypass Obesity

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宁波华茂艺术教育博物馆

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云南化工 2021年第4期 80-85页

作者： Jorge santos Joana soeiro sara Pinto susana Oliveira Francesca Tiri Rita Ferreira Diana Vasconcelos inês bastos Luisa Felizardo 侯博文范嘉苑 HouPictures

外在小巧,内在丰盈。一间博物馆的内部空间必须广阔。一间博物馆的内部空间必须明亮。华茂艺术教育博物馆是一间体量小而内部宽广的博物馆。它倚靠小山坡,以波浪状的起伏姿态立于地面之上,以其优雅而迷人的特征吸引着人们。在这座小建...

外在小巧,内在丰盈。一间博物馆的内部空间必须广阔。一间博物馆的内部空间必须明亮。华茂艺术教育博物馆是一间体量小而内部宽广的博物馆。它倚靠小山坡,以波浪状的起伏姿态立于地面之上,以其优雅而迷人的特征吸引着人们。在这座小建筑之中,任何东西都是举重若轻。环绕建筑外延探索至内嵌于低矮屋檐下的公共入口,推开不起眼的大门将进入一个广阔的空间,挑高的建筑映入眼帘,沿蜿蜒的斜坡能到达不同楼层。这种介于"压缩"与"释放"之间的空间体验恒定地存在于参访的过程之中。多样化的参观流线以及相互连接的空间让这座小建筑的内部看起来开阔宽敞。

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Performance of a Double Catalyst Fuel Cell Cathode with a Tubular Oxygen Breathing and Preliminary Reduction Zone

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Journal of Thermal science 2005年第2期14卷 187-192页

作者： Luís A.Waack BAMBACE Miriam NIsHIMORI Fernando M.RAMOs Demétrio bastos-NETTO Instituto Nacional de Pesquisas Espaciais-INPE Av.Dos Astronautas 1758 S■o José dos CamposSPBrazilCEP 12210-970Instituto Nacional de Pesquisas Espaciais-INPE Av.Dos Astronautas 1758S■o José dos CamposSPBrazilCEP 12210-970Instituto Nacional de Pesquisas Espaciais-INPE Av.Dos Astronautas 1758S■o José dos CamposSPBrazilCEP 12210-970Instituto National de Pesquisas Espaciais-INPE Rod.Presidente Dutra km 40Cachoeira PaulistaSPBrazil CEP12630-000

This paper discusses a mathematical model for a liquid phase reacting flow occurring at the cathode of a patent pending novel fuel cell geometry, where a non homogeneous catalysis carried by gold and Prussian Blue, with the first reducing air O2 and the second the resulting H2O2. The breathing zone is porous walls microtubes, with three different types of pores in its walls. Inside the microtubes there is water solution of sulfuric acid. The microtubes possess an external layer of extremely porous polymer hydrophobic agent. A Prussian Blue thin porous layer is over the selective membrane. Appropriate porous and tubular connecting elements close the fluid loop. The asymmetry induces proper current and electric potential profiles, which leads to a mainly electrocapillary electrokinetic flow, which enhances the oxygen transport and assures the H2O2 flow to its reduction layer.

关键词： non homogeneous catalysis fuel cell cathode electrokinetic convection breathing area.

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A demand side management approach to increase self-consumption in buildings

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Building simulation 2023年第2期16卷 317-335页

作者： Carlos Fernández Bandera Gabriela bastos Porsani María Fernández-Vigil Iglesias school of Architecture University of Navarra31009 PamplonaSpain

There is a growing interest in increasing the presence of renewable energy in the electric *** production from grid-connected systems is leading this growth in terms of *** this development,concern about network security has emerged,because excesses of intermittent renewable energy on the grid could exceed voltage ***-consumption,understood as the capacity of the producer to consume his or her own production,can partially solve these *** controllable loads,such as heating and cooling,represent 50%of the total amount of energy consumed by buildings;the proper allocation of these loads could be a driving force for *** this study,a demand side management strategy is proposed based on a building energy model equipped with an inverter heat pump coupled with a photovoltaic *** goal is to maximize the use of local energy from the photovoltaic plant(self-consumption),reducing the export and import of energy to and from the *** goal is achieved by optimizing the set-points in each *** array of optimal set-points over six years is *** results show the capacity of the methodology to match similar values of self-consumption(70%in winter and 50%in summer)obtained by strategies based on chemical *** findings are shown in an energy matching chart at different levels of detail(yearly and monthly).Color bubbles are added to the matching chart to help visualize the unmatched energy of the system *** comparison with actual model predictive control technologies,this study’s strategy offers great simplicity and a large saving in computational time.

关键词： sensor data internal thermal mass energy simulation EnergyPlus inverse model

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Mapping data gaps to estimate biomass across Brazilian Amazon forests

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Forest Ecosystems 2020年第3期7卷 334-348页

作者： Graciela Tejada Eric bastos Görgens Alex Ovando Jean Pierre Ometto Earth system science Center(CCsT) National Institute for Space Research(INPE)Av dos Astronautas 1758São Josédos CamposSP12227-010Brazil Department of Forestry Engineering Universidade Federal dos Vales do Jequitinhonha e MucuriCampus JKRod.MGT 367km 5835000Alto do JacubaDiamantinaMG39100-000Brazil National Center for Monitoring and Early Warning of Natural Disasters(CEMADEN) Estrada Doutor Alino Bondesani 500São Josédos CamposSP12247-016Brazil

Background: Tropical forests play a fundamental role in the provision of diverse ecosystem services, such as biodiversity,climate and air quality regulation, freshwater provision, carbon cycling, agricultural support and culture. To understand the role of forests in the carbon balance, aboveground biomass(AGB) estimates are needed. Given the importance of Brazilian tropical forests, there is an urgent need to improve AGB estimates to support the Brazilian commitments under the United Nations Framework Convention on Climate Change(UNFCCC). Many AGB maps and datasets exist, varying in availability, scale and coverage. Thus, stakeholders, policy makers and scientists must decide which AGB product, dataset or combination of data to use for their particular goals. In this study, we assessed the gaps in the spatial AGB data across the Brazilian Amazon forests not only to orient the decision makers about the data that are currently available but also to provide a guide for future ***: We obtained a map of the gaps in the forest AGB spatial data for the Brazilian Amazon using statistics and differences between AGB maps and a spatial multicriteria evaluation that considered the current AGB datasets. The AGB spatial data gap map represents areas with good coverage of AGB data and, consequently, the main gaps or priority areas where further biomass assessments should focus, including the northeast of Amazon state, Amapá and northeast of Pará. Additional y, by quantifying the variability in both the AGB maps and field data on multiple environmental factors,we provide valuable elements for understanding the current AGB data as a function of climate, soil, vegetation and ***: The map of AGB data gaps could become a useful tool for policy makers and different stakeholders working on National Communications, Reducing Emissions from Deforestation and Degradation(REDD+), or carbon emissions modeling to prioritize places to implement further AGB a

关键词： Amazon Tropical forest Carbon Aboveground biomass Data gaps REDD+ Environmental factors

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Gut microbiota-derived metabolites are novel targets for improving insulin resistance

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World Journal of Diabetes 2022年第1期13卷 65-69页

作者： Rosana MC bastos Érika B Rangel Hospital Israelita Albert Einstein São Paulo 05652-001SPBrazil Nephrology Division Federal University of São PauloSão Paulo 04023-900SPBrazil

The gut microbiota plays a key role in metabolic ***-microbiota-derived metabolites are found in different dietary sources,including:Carbohydrate(acetate,propionate,butyrate,also known as short-chain fatty acids,as well as succinate);protein(hydrogen sulfide,indole,and phenylacetic acid);and lipids(resveratrol-,ferulic acid-,linoleic acid-,catechin-and berry-derived metabolites).Insulin resistance,which is a global pandemic metabolic disease that progresses to type 2 diabetes mellitus,can be directly targeted by these ***-derived metabolites have broad effects locally and in distinct organs,in particular skeletal muscle,adipose tissue,and *** metabolites can modulate glucose metabolism,including the increase in glucose uptake and lipid oxidation in skeletal muscle,and decrease in lipogenesis and gluconeogenesis associated with lipid oxidation in the liver through activation of phosphatidylinositol 3-kinase-serine/threonine-protein kinase B and AMP-activated protein *** adipose tissue,gut-microbiota-derived metabolites stimulate adipogenesis and thermogenesis,inhibit lipolysis,and attenuate ***,an increase in energy expenditure and fat oxidation occurs in the whole ***,the therapeutic potential of current pharmacological and non-pharmacological approaches used to treat diabetes mellitus can be tested to target specific metabolites derived from intestinal bacteria,which may ultimately ameliorate the hyperglycemic burden.

关键词： Insulin resistance Gut microbiota Metabolites Host metabolism Metabolic organs Novel targets

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Hadron resonances as rovibrational states

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Chinese Physics C 2021年第8期45卷 99-104页

作者： Douglas L.Bernardo Cristiano C.bastos Antonio C.Pavao Departamento de Quimica Fundamental Universidade Federal de PernambucoRecife50740-540Brazil Departamento de Quimica Universidade Federal Rural de PernambucoRecife52171-900Brazil

A rovibrational model,including anharmonic,centrifugal,and Coriolis corrections,is used to calculate π,K,N,and ∑ orbital and radial *** four orbital excitations of the n meson correspond to the/?(1235),ti2(1670),63(2030),and π4(2250)*** first four radial excitations correspond to the π(1300),π(1800),π(2070),and 7t(2360)*** orbital excitations of the K meson are interpreted as the K_(1)(1270),K_(2)(1770),K_(3)(2320),and K_(4)(2500)resonances;its radial excitations correspond to the K(1460)and K(1830)*** N orbital excitations are identified with the N(1520),N(1680),N(2190),N(2220),and N(2600)*** first four radial excitations of the N family correspond to the N(1440),N(1880),N(2100),and N(2300)*** orbital excitations of the ∑ baryon are associated with the ∑(1670),∑(1915),∑(2100),and ∑(2250)resonances,whereas its radial excitations are identified with the ∑(1660),∑(1770),and ∑(1880)*** proposed rovibrational model calculations show a good agreement with the corresponding experimental values and allow for the prediction of hadron resonances,thereby proving to be useful for the interpretation of excited hadron spectra.

关键词： excited hadron spectrum orbital and radial resonances rovibrational states

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Plastic effects on marine and freshwater environments

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Water Biology and security 2024年第1期3卷 23-27页

作者： Fabiula Danielli bastos de sousa Technology Development Center Universidade Federal de PelotasRua Gomes Carneiro196010-610PelotasRSBrazil

In the 1930s,plastic items started to acquire *** then,they have overcome many barriers and are now important to many facets of ***-consumer plastic,however,is an environmental problem of increasing *** and freshwater environments are being impaired by plastic pollution,which is mostly the result of improper post-use plastic *** I review recent literature on plastic effects to marine and freshwater environments,based on a scopus ***'keywords were analyzed and *** depicted microplastics as a global concern for the environment,animals,and human health,and was identified as a primary research focus and emerging topic concerning plastic effects on marine and freshwater *** foremost research gap is the lack of clear connections between the effects of plastic on human health,animal health,and the *** pollution and its consequences on marine and freshwater environments are attributed primarily to human activity.

关键词： Bibliometric analysis Bibliometric mapping Microplastics Pollution

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Risk factors, surgical complications and graft survival in liver transplant recipients with early allograft dysfunction

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Hepatobiliary & Pancreatic Diseases International 2019年第5期18卷 423-429页

作者： Douglas bastos-Neves Paolo Rogerio de Oliveira salvalaggio Marcio Dias de Almeida Digestive and Hepatobiliary surgery Hospital Sao Vicente de PauloRio de JaneiroBrazil Liver Transplant Unit Hospital Israelita Albert EinsteinSao PauloBrazil

Background: Early allograft dysfunction (EAD) is a severe complication after liver transplantation. The associated risk factors and complications have re-gained recent interest. This study investigated risk factors, survival and complications associated with EAD in a large liver transplant center in Latin America. Methods: Retrospective, unicenter, cohort, based on data from adult patients undergoing first deceaseddonor liver transplant from January 2009 to December 2013. EAD was defined by one or more of the following:(i) bilirubin ≥10 mg/dL on postoperative day 7;(ii) international normalized ratio ≥1.6 on postoperative day 7, and (iii) alanine aminotransferase or aspartate aminotransferase > 2000 IU/L within the first seven days after transplant. Results: A total of 602 patients were included;of these 34.2% developed EAD. Donor risk factors were male ( P = 0.007), age between 50 and 59 years ( P = 0.034), overweight ( P = 0.028) or grade I obesity ( P = 0.012), sodium > 157 mmol/L ( P = 0.002) and grade IV ischemia/reperfusion injury ( P = 0.002). Cold ischemia time ≥10 h ( P = 0.008) and warm ischemia time ≥40 min ( P = 0.013) were the surgical factors. Male ( P s the only recipient protective factor. Compared with the non-EAD group, patients with EAD were submitted to more reoperations (24.3% vs. 13.4%, P = 0.001) and had higher graft loss rates (37.9% vs. 21.2%, P similar patient survival rates ( P = 0.238). Conclusions: EAD risk factors are related to donor, surgical procedure and recipient. Donor risk factors for EAD were male, age between 50 and 59 years, donor overweight or grade Ⅰ obesity, sodium > 157 mmol/L and grade Ⅳ ischemia/reperfusion injury. Cold ischemia time ≥10 h and warm ischemia time ≥40 min were the surgical risk factors. Male was the only recipient protective factor. Patients with EAD had higher reoperations and graft loss rates.

关键词： Graft survival Liver transplantation Primary graft dysfunction Donor evaluation

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