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Nitrogen Metabolism in leaves of a tank epiphytic bromeliad: Characterization of a spatial and functional division

TAKAHASHI, Cassia Ayumi; MERCIER, Helenice
Fonte: ELSEVIER GMBH, URBAN & FISCHER VERLAG Publicador: ELSEVIER GMBH, URBAN & FISCHER VERLAG
Tipo: Artigo de Revista Científica
ENG
Relevância na Pesquisa
37.03%
The leaf is considered the most important vegetative organ of tank epiphytic bromeliads due to its ability to absorb and assimilate nutrients. However, little is known about the physiological characteristics of nutrient uptake and assimilation. In order to better understand the mechanisms utilized by some tank epiphytic bromeliads to optimize the nitrogen acquisition and assimilation, a study was proposed to verify the existence of a differential capacity to assimilate nitrogen in different leaf portions. The experiments were conducted using young plants of Vriesea gigantea. A nutrient solution containing NO(3)(-)/NH(4)(+) or urea as the sole nitrogen source was supplied to the tank of these plants and the activities of urease, nitrate reductase (NR), glutamine synthetase (GS) and glutamate dehydrogenase (NADH-GDH) were quantified in apical and basal leaf portions after 1, 3, 6, 9, 12, 24 and 48 h. The endogenous ammonium and urea contents were also analyzed. Independent of the nitrogen sources utilized, NR and urease activities were higher in the basal portions of leaves in all the period analyzed. On the contrary. GS and GDH activities were higher in apical part. It was also observed that the endogenous ammonium and urea had the highest contents detected in the basal region. These results suggest that the basal portion was preferentially involved in nitrate reduction and urea hydrolysis...

Estudo de uma metodologia para o dimensionamento de um tanque de provas do tipo reboque.; Study of a methodology for the desing of a towink tank.

Saldarriaga Muñoz, Jaime Miguel Mariano
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 17/12/2010 PT
Relevância na Pesquisa
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Um tanque de provas do tipo reboque permite a realização de ensaios hidrodinâmicos com modelos em escala, sua presença é importante devido à possibilidade de obter características hidrodinâmicas que dimensionam a potência e qualidade do comportamento dos navios durante a sua operação, otimizando os projetos de forma particular ou geral, tanto para a navegação marítima, lacustre ou fluvial. O objetivo principal desta pesquisa é estudar e propor uma metodologia para o dimensionamento e concepção de um tanque de reboque para o Serviço Industrial da Marinha (SIMA PERU), principal estaleiro do Peru, de maneira que possa realizar os ensaios hidrodinâmicos correspondentes aos diferentes tipos de embarcações produzidas pelo SIMA PERU. Como propósito de estudo será desenvolvido uma análise de um tanque de reboque que permitirá ensaiar modelos de diferentes tipos de embarcações, levando em consideração as diferentes condições ambientais e climáticas relacionadas ao litoral peruano em toda sua extensão, isto é, uma condição marítima equivalente a uma escala Beaufort 5. Estas são as condições que foram requeridas para atuar na costa peruana. Será proposto um tanque de reboque com características próprias...

Estudo de estrutura turbulenta gerada por tanque de grade oscilante observada por PIV; Study design generated by turbulent tank grid oscillating observed by PIV

Vieira, Amanara Potykytã de Sousa Dias
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 15/06/2012 PT
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Um regime ou fluxo turbulento pode ser definido simplificadamente como uma forma de escoamento no qual o movimento de um fluido ocorre de forma aparentemente aleatória. A natureza caótica desse tipo de regime não possibilita que o problema seja abordado de modo determinístico, consequentemente, não pode ser descrito através de expressões analíticas para descrever seu campo de velocidades. Apesar de ser impossível estudar o movimento de cada partícula, pode-se visualizar o problema de forma macroscópica. Utilizando-se de simplificações e generalizações pode-se fazer uso de estudos numéricos em uma tentativa de encontrar uma face determinística do fenômeno, como por exemplo, verificação da isotropia e homogeneidade. A turbulência com estas características é um regime em que as componentes da velocidade no espaço e as velocidades em diferentes pontos do escoamento apresentam parâmetros estatísticos semelhantes. Tais condições não existem na prática, mas pode-se construir equipamentos que produzem escoamentos que se aproximam desta condição. Este trabalho consistiu na verificação das condições de turbulência isotrópica e homogênea em um tanque de grade oscilante. Foi utilizado o método de trilhagem de partículas por fotografia estereoscópica...

Sistema de automação e controle para tanques oceânicos com múltiplos atuadores; Automation and control system for oceanic wave tank with multiple actuators.

Mello, Pedro Cardozo de
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Tese de Doutorado Formato: application/pdf
Publicado em 26/03/2012 PT
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37.17%
O presente trabalho aborda o desenvolvimento de um sistema de automação e controle para tanques oceânicos com múltiplos atuadores para possibilitar a geração e absorção ativa de ondas. O desenvolvimento compreende: a implementação e a validação do sistema de automação e controle para o tanque de provas; o desenvolvimento de algoritmos para a geração de ondas com batedores do tipo flap, para atender aos casos tipicamente utilizados em ensaios de estruturas oceânicas, tais como ondas regulares e irregulares, com ou sem espalhamento direcional. O sistema desenvolvido fez uso de controladores do tipo CLP (controlador lógico programável) em rede de comunicação industrial usando troca de dados síncrona, como uma solução robusta de automação. Os controladores desenvolvidos foram estudados individualmente para a devida caracterização e identificação dos limites de desempenho. Sensores de ondas ultrassônicos foram desenvolvidos e caracterizados para medir ondas nos atuadores e viabilizar a malha de controle de absorção ativa do tanque de provas. Sensores de ondas capacitivos foram desenvolvidos e calibrados para a medição de ondas nos ensaios experimentais. A validação experimental do funcionamento do sistema de atuação...

Assimilação do nitrogênio em folhas de Vriesea gigantea (Bromeliaceae) durante a transição ontogenética do hábito atmosférico para o epífito com tanque; Nitrogen assimilation in leaves of Vriesea gigantea (Bromeliaceae) during the ontogenetic transition from atmospheric to tank epiphyte habit

Takahashi, Cassia Ayumi
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Tese de Doutorado Formato: application/pdf
Publicado em 10/03/2014 PT
Relevância na Pesquisa
37.25%
A fase de desenvolvimento é um importante fator a ser considerado em pesquisas sobre nutrição de bromélias. O hábito de vida dessas plantas pode mudar de: atmosférica (com folhas sem formar um tanque) para o com tanque ao longo do seu desenvolvimento. Algumas pesquisas mostraram que o conteúdo de nitrogênio foliar ou capacidade fotossintética são significantemente influenciados pela fase de desenvolvimento, porém não há registros de que a nutrição e o metabolismo do nitrogênio diferem entre bromélias jovens ou adultas. O objetivo principal deste projeto foi verificar se existem diferenças na dinâmica do metabolismo do nitrogênio (absorção, transporte e assimilação), decorrente da utilização de fontes de distintas (amônio, nitrato ou ureia), entre bromélias nas fases atmosférica ou adultas com tanque desenvolvido. Para tanto, plantas de Vriesea gigantea foram regadas com uma solução nutritiva que conteve 5mM de N total, disponível nas formas: 15NH4+ ou 15NO3- ou 15N-ureia. Foram feitas coletas temporais das raízes e de duas diferentes porções da folha (ápice e base) das bromélias jovens e de três regiões foliares (ápice, mediana e base) das folhas das bromélias adultas com tanque. Todas as amostras vegetais foram utilizadas na avaliação das atividades da: urease...

Effect of tank colour on larval performance of the Amazon River prawn Macrobrachium amazonicum

Maciel, Cristiana Ramalho; Valenti, Wagner C.
Fonte: Wiley-Blackwell Publicador: Wiley-Blackwell
Tipo: Artigo de Revista Científica Formato: 1041-1050
ENG
Relevância na Pesquisa
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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq); The aim of this study was to evaluate the effects of hatchery-tank colours (white, yellow, red, blue, green and black) on the performance of larval culture of Macrobrachium amazonicum. The larvae were fed daily with newly hatched Artemia nauplii. The hatchery-tank colours affected the light level inside the tanks, the consumption of Artemia nauplii (AN), larval development, survival, mass gain and productivity of postlarvae (PL). The overall consumption of Artemia nauplii per larva during the larval cycle was 30% and 45% higher in the green and red tanks respectively. The significant variation of AN consumption among tank colours (P= 0.0006) indicates that M. amazonicum larvae are visual predators. Survival was higher in the black, blue and green tanks, reaching more than 75%. However, the highest productivity was obtained in the black tanks (80.1 PLL-1). Lighter coloured tanks and excess luminosity (more than 2 mu mols(-1)m(2) at tank bottom) appear to be important stress factors for larvae, contributing to reduce survival and productivity. The results indicate that rearing M. amazonicum in black tanks will improve larvae condition, ensure greater productivity of postlarvae and lower Artemia consumption...

Avaliação do desempenho da modificação de um sistema de tratamento de esgoto composto por tanque séptico e filtro anaeróbio por um modelo de aeração compartimentada; Performance evaluation of the modification of a sewage treatment system consisting of septic tank and anaerobic filter for a model compartimentalized aeration

Josué Tadeu Leite França
Fonte: Biblioteca Digital da Unicamp Publicador: Biblioteca Digital da Unicamp
Tipo: Tese de Doutorado Formato: application/pdf
Publicado em 29/02/2012 PT
Relevância na Pesquisa
36.96%
Este trabalho tem como objetivo avaliar o desempenho da modificação concernente a um processo de tratamento "tanque séptico seguido de filtro anaeróbio", no Distrito Bom Retiro, município de Angatuba, região sudoeste do Estado de São Paulo, por um modelo aerado, com aproveitamento integral das unidades existentes após pequenas adequações, visando atender a legislação e com baixo nível de operação. O sistema foi baseado em alguns parâmetros utilizados em lagoas aeradas e parcialmente aeradas. A remoção do lodo para a proposta é anual ou quando o sistema atingir os limites dos parâmetros de controle operacional: DBO efluente ? 60 mg O2 L-1 ou eficiência de remoção dos SST ? 80%. Após um ano de operação da proposta parcialmente concluída (sem tratamento preliminar), apesar de não atingir os limites máximos estabelecidos foram realizadas a quantificação e remoção do lodo gerado. O sistema de desaguamento foi realizado em uma série de "BAGs" verticais de polipropileno reutilizáveis por até 20 vezes, com capacidade para 2m³. Após as adequações, os resultados na segunda etapa do experimento com relação à DBO afluente e efluente, sólidos em suspensão total efluente (SST), residual de oxigênio dissolvido na saída do tanque de polimento...

Optimum feed- and tank-operating conditions to maintain constant particle concentration in feed streams of particulate fluid food suspensions

Baptista, Paulo N.; Oliveira, Fernanda A.R; Oliveira, Jorge C.
Fonte: Wiley Blackwell Publicador: Wiley Blackwell
Tipo: Artigo de Revista Científica
Publicado em //1994 ENG
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Ensuring product safety and constant quality in aseptic processing of particulate fluid foods can be a problem if feed particle concentration varies with time. the variability of particle concentration distributions from a vertical stirred feed tank was measured as standard deviations of mean particle concentrations at the tank outlet and as differences between this concentration and the bulk concentration in the tank. the influence of some operating variables (volume of fluid in the tank, rotational speed of the agitating paddles, bulk particle concentration, liquid viscosity and flow rate) was studied using a factorial experimental design at two levels. an operating chart was drawn, using response surface analysis for selecting the optimum volume of fluid in the tank as a function of particle concentration and fluid viscosity.

Nonlinear wave transmission and pressure on the fixed truncated breakwater using NURBS numerical wave tank

Abbasnia,Arash; Ghiasi,Mahmoud
Fonte: Associação Brasileira de Ciências Mecânicas Publicador: Associação Brasileira de Ciências Mecânicas
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/01/2014 EN
Relevância na Pesquisa
36.87%
Fully nonlinear wave interaction with a fixed breakwater is investigated in a numerical wave tank (NWT). The potential theory and high-order boundary element method are used to solve the boundary value problem. Time domain simulation by a mixed Eulerian-Lagrangian (MEL) formulation and high-order boundary integral method based on non uniform rational B-spline (NURBS) formulation is employed to solve the equations. At each time step, Laplace equation is solved in Eulerian frame and fully non-linear free-surface conditions are updated in Lagrangian manner through material node approach and fourth order Runge-Kutta time integration scheme. Incident wave is fed by specifying the normal flux of appropriate wave potential on the fixed inflow boundary. To ensure the open water condition and to reduce the reflected wave energy into the computational domain, two damping zones are provided on both ends of the numerical wave tank. The convergence and stability of the presented numerical procedure are examined and compared with the analytical solutions. Wave reflection and transmission of nonlinear waves with different steepness are investigated. Also, the calculation of wave load on the breakwater is evaluated by first and second order time derivatives of the potential.

Numerical Simulation of water Circulation in a Cylindrical Horizontal Thermal Tank

Savicki, Darci Luiz; Vielmo, Horácio Antonio
Fonte: Universidade Federal do Rio Grande Publicador: Universidade Federal do Rio Grande
Tipo: Artigo de Revista Científica
ENG
Relevância na Pesquisa
37.03%
It is carried out a numerical study of the three-dimensional temperature and velocity fields in a cylindrical horizontal thermal tank during the process of water circulation. The numerical simulations were made using an academic Finite Volumes numerical code. This simulation considers that the thermal tank is connected to solar collectors. So, in the tank, the inlet jet temperature is higher than those inside the tank. This study aims to investigate the influence of the inlet jet on thermal stratification. The results show that for the mass flow rate studied, there is no significant variation on thermal stratification.

Computational modeling of a regular wave tank

Gomes, Mateus das Neves; Olinto, Claudio Rodrigues; Rocha, Luiz Alberto Oliveira; Souza, Jeferson Avila; Isoldi, Liércio André
Fonte: Universidade Federal do Rio Grande Publicador: Universidade Federal do Rio Grande
Tipo: Artigo de Revista Científica
ENG
Relevância na Pesquisa
36.87%
This paper presents two different numerical methodologies to generate regular gravity waves in a wave tank. We performed numerical simulations of wave generation through the FLUENT® package, using the Volume of Fluid (VOF) multiphase model to reproduce the wave propagation in the tank. Thus it was possible to analyze two methods for generating regular waves that could be used in future work, especially in the study of devices of energy conversion from ocean waves into electrical energy.

Numerical simulation of fluid dynamics in the stirred tank by the SSG Reynolds Stress Model

Qi, N.; Wang, H.; Zhang, K.; Zhang, H.
Fonte: Gaodeng Jiaoyu Chubanshe Publicador: Gaodeng Jiaoyu Chubanshe
Tipo: Artigo de Revista Científica
Publicado em //2010 EN
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37.03%
The Speziale, Sarkar and Gatski Reynolds Stress Model (SSG RSM) is utilized to simulate the fluid dynamics in a full baffled stirred tank with a Rushton turbine impeller. Four levels of grid resolutions are chosen to determine an optimised number of grids for further simulations. CFD model data in terms of the flow field, trailing vortex, and the power number are compared with published experimental results. The comparison shows that the global fluid dynamics throughout the stirred tank and the local characteristics of trailing vortices near the blade tips can be captured by the SSG RSM. The predicted mean velocity components in axial, radial and tangential direction are also in good agreement with experiment data. The power number predicted is quite close to the designed value, which demonstrates that this model can accurately calculate the power number in the stirred tank. Therefore, the simulation by using a combination of SSG RSM and MRF impeller rotational model can accurately model turbulent fluid flow in the stirred tank, and it offers an alternative method for design and optimisation of stirred tanks.; Nana Qi, Hui Wang, Kai Zhang and Hu Zhang

A-10/GAU-8 low angle firings versus simulated Soviet tank battalion: (Honeywell lot number OL78DO43-016) (Array 3) 2 February 1979; NA

Stolfi, Russel H.S.; McEachin, R. R.
Fonte: Monterey, California. Naval Postgraduate School Publicador: Monterey, California. Naval Postgraduate School
Tipo: Relatório Formato: NA
EN_US
Relevância na Pesquisa
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This report describes LAVP firings of the 30mm GAU-8 ammunition manufactured by Honeywell. The firings were conducted on 2 February 1979 utilizing the A-10/GAU-8 weapon system and ammunition from LAVP Lot Number OL78D-43-016. Targets for the firings were 31 US M-47 tanks arranged in a static formation to simulate a Soviet MBT Battalion of three ten (10) tank companies and a battalion commander tank. Also included in the target array were four plywood mock-ups, simulating the tank battalion's ZSU-23/4anti-aircraft defense. Five A-10 pilots conducted firing passes at the formation of M-47 target tanks and ZSU-23/4 mock-ups. Normal A-10 operational tactics for low altitude, low dive angle attacks were followed. This publication contains a description of the firing conditions, A-10 attack parameters, weapons effects derived from the firings, and individual damage assessments for each target tank in the array. The data collected from this test verify the acceptability of the ammunition lot tested, and the effectiveness of the A-10/GAU-8 weapon system as one capable of inflicting catastrophic (K), mobility (M), and firepower (F) kills against modern main battle tanks. (Author); A-10 System Program Office D 208.14/2:NPS-56-81-001 Wright Patterson Air Force Base...

An analysis of the common missile and TOW 2B on the Stryker anti-tank guided missile platform, using the Janus simulation

Peterson, Samuel L.
Fonte: Monterey, California. Naval Postgraduate School Publicador: Monterey, California. Naval Postgraduate School
Tipo: Thesis; Thesis Formato: xiv, 117 p. : ill. (some col.) ;
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Approved for public release; distribution in unlimited.; Approved for public release; distribution in unlimited.; The U.S. Army is beginning to field the first of six Stryker Brigade Combat Teams (SBCTs) and equip the organic Anti-Tank (AT) Company of the Brigade with the LAV III Anti-Tank Guided Missile (ATGM) Platform and the Tube-Launched, Optically-Tracked, Wire-Guided 2B (TOW 2B) missile system. A developmental effort is currently underway to replace the aging TOW 2B and Hellfire missile systems with a common missile that meets both ground and air requirements. With increased range, lethality, and target acquisition capability, the Common Missile (CM) is being designed as the primary weapon system for the Army's Comanche helicopter and is a candidate for the lethality system of the Future Combat System (FCS) within the Army's Objective Force. Additionally, the CM is designed to be "backwards compatible" with existing TOW 2B and Hellfire launch platforms. The objective of this research effort is to determine the increase in operational effectiveness through the employment of the CM in the AT company of the SBCT in three different scenarios, using the high-resolution Janus Combat Model. Operational effectiveness will be assessed and statistically analyzed using lethality...

Evaluation of a Stratified Multi-tank Thermal Storage for Solar Heating Applications

Cruickshank, CYNTHIA
Fonte: Quens University Publicador: Quens University
Tipo: Tese de Doutorado Formato: 4505718 bytes; application/pdf
EN; EN
Relevância na Pesquisa
37.08%
A novel multi-tank thermal energy storage (TES) was evaluated experimentally and numerically. The multi-tank storage is based on the interconnection of standard hot water storage tanks by a single charge flow loop. Each tank is charged through a thermosyphon loop and natural convection heat exchanger (NCHE). Both series- and parallel-connected configurations were investigated and results show that high degrees of stratification can occur. To predict the performance of the series- and parallel-connected multi-tank TES, a numerical model was developed and implemented in the TRNSYS simulation environment. Laboratory tests were also conducted to measure the unit’s performance under charge conditions representative of combinations of clear and overcast days. The effects of rising and falling charge loop temperatures and power levels on storage temperatures and heat transfer rates were studied and indicated that sequential stratification was achieved in the series-connected storage. Under certain conditions, reverse flow through the thermosyphon loops was identified, leading to destratification and carry-over of heat to the downstream storage tanks. Consequently, a new model was developed and showed to model reverse thermosyphon operation. A subsequent analysis showed that these effects could be minimized by careful system design. To quantify the relative benefits of the sequentially stratified TES...

L'Institut économique de Montréal, un Think Tank influent sur la scène des idées au Québec

Savard-Lecomte, Marie-Odile
Fonte: Université de Montréal Publicador: Université de Montréal
Tipo: Thèse ou Mémoire numérique / Electronic Thesis or Dissertation
FR
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37.11%
Depuis l’élection de Jean Charest en 2003, nous constatons que les dogmes issus du discours idéologique néolibéral (déréglementation, privatisation, libéralisation et réduction des dépenses publiques) ont régulièrement et fortement inondé tous les domaines de l’espace public québécois, tant chez les élus que chez les grands conglomérats de médias écrits et audiovisuels. Nous cherchions à savoir qui exerçait une si grande influence pour que rayonnent ces idées conservatrices dans les discours publics au Québec. Nos recherches nous ont menée à un Think Tank québécois : l’Institut économique de Montréal. L’élite intellectuelle qui compose cette organisation a su user d’une influence importante auprès de certains médias écrits, notamment ceux de Gesca, qui, grâce à l’étendue de son puissant réseau social et à son adhésion aux stratégies d’influence de ses pairs, les Think Tanks partisans, a relayé les idées néolibérales de l’IEDM à l’intérieur du discours public québécois. Ce Think Tank a ainsi fait rayonner ses idées dans les pages des quotidiens parmi les plus lus par les Québécois francophones. De jeunes Think Tanks comme l’IEDM jugent primordial l’accès aux médias pour façonner l’opinion et les politiques publiques. Leur objectif est de réussir à influencer la mise à l’agenda et le cadrage des médias afin qu’ils favorisent leurs propositions et leurs idées. L’analyse de trois cas a permis de montrer...

Incorporação do lodo de tanque séptico como matéria-prima de uma mistura asfáltica; Septic tank sludge applied as raw material of asphalt mixture

Medeiros, Sayonara Andrade de
Fonte: Universidade Federal do Rio Grande do Norte; BR; UFRN; Programa de Pós-graduação em Engenharia Sanitária; Saneamento Ambiental; Meio Ambiente; Recursos Hídricos e Hidráulica Publicador: Universidade Federal do Rio Grande do Norte; BR; UFRN; Programa de Pós-graduação em Engenharia Sanitária; Saneamento Ambiental; Meio Ambiente; Recursos Hídricos e Hidráulica
Tipo: Dissertação Formato: application/pdf
POR
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36.96%
In Natal/RN, 68% of the population uses some kind of individual system for their domestic sewers treatment, being that the most used it is septic tank, followed by sumidouro. Every treatment system of sewers, usually used, generates a by-product denominated sludge. That residue presents some components, in its constitution, undesirable under the environmental and sanitary point of view. In such case, to assure that the system treatment has satisfactory results, it is necessary to do the adjusted disposition of the sludge sewage. Several countries are looking for technical alternatives for the use and disposition of residues. Under technical and environmental conditions appropriate, these materials can be used, decreasing the consumption of the natural resources and the treatment need, storage or elimination of the wastes, what decrease the risks created. Some of the alternatives of recycling of the sludge sewage are: the application in the agriculture, in the production of energy and as raw material in the civil construction. This study evaluated asphalt mixtures behavior that partially substituted conventional aggregates by septic tank sludge. The septic tank sludge gave origin to two raw materials called raw sludge and sludge ash. The raw sludge was put as a small aggregate and the sludge ash as filler. In the first experiment it was made a comparison between the mixture with conventional aggregates and the mixtures that replaced sand by raw sludge in the proportions from 5% to 40%. In the second experiment...

WWW Remote Control of the Underwater Acoustics Tank Laboratory of the Instituto de Acústica, CSIC, in Madrid

Ranz Guerra, Carlos; García, Mario
Fonte: Instituto de Pesquisas da Marinha Publicador: Instituto de Pesquisas da Marinha
Tipo: Comunicación de congreso Formato: 297027 bytes; application/pdf
ENG
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6 pages.-- PACS numbers: 43.58.-E, 43.30.-K.--Communication presented at the IV Encontro de Tecnología em Acústica Submarina (Rio de Janeiro, Brasil, 10-12 Nov. 1999).; The Underwater Acoustics Tank Laboratory at the Instituto de Acústica, CSIC, has been recently reshaped. The new tank framework introduces the installation of two bridges with an automatic control on the three coordinates and the angle (Ranz & Cobo, 1998). In the last months the hardware and software necessary for sequencing the signal acquisition with the bridges motion has been incorporated. While being always necessary one operator, at the laboratory, to survey the tank activities, the actual structure allows to carry the full control of the tank motion as well as the signal acquisition out by any person, at any place, through the usual www network support. This paper describes the actual installation and the facilities involved.; The authors are willing to acknowledge the help given by the PN CYTMAR and to the CSIC for their financial support to enlarge the capabilities of the Hydroacoustic Tank of the Instituto de Acústica.; Peer reviewed

Los think tank y advocacy tank como actores de la comunicación política

Xifra, Jordi
Fonte: Universidade Autônoma de Barcelona Publicador: Universidade Autônoma de Barcelona
Tipo: Article; info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion Formato: application/pdf
Publicado em //2005 SPA
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Los denominados think tank —fenómeno eminentemente norteamericano o, a lo sumo, anglosajón, aunque su expansión en los países desarrollados es notable— pueden ser considerados públicos especiales de los programas de comunicación corporativa promovidos principalmente por grupos de presión, al tiempo que son, per se, actores privilegiados de la actual comunicación política, cada día más nutrida por las técnicas de las relaciones públicas. No obstante, la evolución de estos institutos de análisis político en los últimos tiempos los está asimilando operativamente a los grupos de presión tradicionales, siendo organizaciones que promueven, como éstos, mayoritariamente estrategias de relaciones públicas. Esta ambivalencia los convierte en un objeto de análisis relevante para el estudioso de la comunicación política y de las relaciones públicas.; Think tanks —basically American phenomenon or, at most, Anglo-Saxon although his development in others countries is notable— can be considerate special publics in corporate communication programs mostly promote by pressure groups, and they are privileged actors of the contemporary political communication, every day more fed by the public relations techniques. However...

Computational analysis of the flow field in a baffled mixing tank

Kellem, Daniel C.
Fonte: Rochester Instituto de Tecnologia Publicador: Rochester Instituto de Tecnologia
Tipo: Tese de Doutorado
EN_US
Relevância na Pesquisa
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The fluid motion in a mixing tank was studied using a CFD code. The particular focus was given to the accurate representation of the role of baffles in a mixing tank. By rebuilding the boundary conditions at each time step the complete effects of the relative motion between the baffles and impeller is captured. This has allowed for an accurate Computational Fluid Dynamic representation of the flow in a baffled mixing tank. In addition, the development of the model has been automated through the use of geometry and mesh definition files. The combination of these two aspects has allowed for rapid model development to be used in selecting optimal tank, fluid and impeller combinations.