Injectors
Mostrando 1-12 de 18 artigos, teses e dissertações.
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1. 3D numerical investigation of mixture formation and combustion in a DISI engine at part-load under stratified operation
This work investigates through numerical simulation, the operation of a big bore direct fuel injection spark ignition engine, at part load under stratified operation. It evaluates fuel-air mixture preparation and combustion process with the adoption of detailed chemical kinetics mechanisms for both Isooctane and Ethanol, and applying adaptive mesh refinement
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2020
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2. Characterization of venturi injector using dimensional analysis
RESUMO Injetores Venturi são comumente empregados para fins de fertirrigação na agricultura, extraindo fertilizante de um tanque para a linha de irrigação. O conhecimento da quantidade de líquido a ser injetado por este dispositivo é útil para assegurar operação e manejo adequados da fertirrigação. Os objetivos desta pesquisa foram: (1) conduzir
Rev. bras. eng. agríc. ambient.. Publicado em: 10/07/2019
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3. Characterization and selection method of Venturi injectors for pressurized irrigation
ABSTRACT Venturi-type chemigation injectors are widely used due to their advantages: they do not require electric power and are cheap to operate. However, they also generate considerable energy losses which affect the pressure in the system. The correct characterization of these systems requires pressures to be correctly set at the inlet, injector and outlet
Rev. Ciênc. Agron.. Publicado em: 2018-06
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4. Geometry and head loss in Venturi injectors through computational fluid dynamics
ABSTRACT To determine the influence of geometry on the hydrodynamic behavior of Venturi injectors, using computational fluid dynamics techniques, we studied, at the Universitat Politècnica de València, Valencia, Spain, the geometric parameters that exert the most influence on head losses: the relationship between throat diameter and nozzle (β), nozzle ang
Eng. Agríc.. Publicado em: 2016-06
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5. Swirl Injection Effects on Hybrid Rocket Motors
ABSTRACT: In the last decades, hybrid rocket engines have been increasingly studied and used in space vehicles. However, the low regression rates and specific impulses still represent major drawbacks to this technology. The objective of this study was to quantify the relative improvement of regression rate values with the use of a swirling flow injector in c
J. Aerosp. Technol. Manag.. Publicado em: 2015-12
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6. Using thought mapping and structured stories to decrease HIV risk behaviors among cocaine injectors and crack smokers in the South of Brazil = A utilização do mapeamento cognitivo e de histórias estruturadas para diminuir comportamentos de risco para a contaminação pelo HIV entre consumidores de cocaína injetável e de crack no Sul do Brasil
Objetivos: Comparar as mudanças em conhecimento sobre AIDS e comportamentos de risco em usuários de cocaína brasileiros submetidos a uma intervenção experimental. Método: 119 sujeitos foram aleatoriamente designados para uma intervenção padrão ou uma intervenção padrão adicionada a um “mapa cognitivo”, e re-entrevistados duas e oito semanas a
Publicado em: 2010
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7. PROJETO DE POÇOS MULTILATERAIS EM RESERVATÓRIOS DE PETRÓLEO OTIMIZADOS POR ALGORITMOS GENÉTICOS / MULTILATERAL WELLS DESIGN IN OIL RESERVOIR THROUGH GENETIC ALGORITHMS OPTIMIZATION
One of the most important factors for recovering oil from oil reservoirs is the wells configuration. Now a days, on the industry, this process is conduced manually, where a specialist generates a few configuration options and uses the best one with best results. This work proposes to investigate a decision support system to optimize the wells¿ configuration
Publicado em: 2009
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8. Modificação técnica e conceitual no sistema de segurança dos geradores e condutos forçados ns 1 e 2 da usina Henry Borden
This study aims to propose a technical and conceptual modification in the safety system of generators and forced ducts n 1 and 2 of Henry Borden hydroelectric power plant, in Cubatão - Sao Paulo, with the main objective of reducing the water hammer in the forced ducts. This work starts with a concise review on hydraulic turbines, with emphasis on the most c
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/03/2008
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9. Controle de uma microturbina a gás com câmara de combustão de baixa emissão de NOx
A number of energy technologies are being employed for distributed generation. When it comes to small scale generation, microturbines are on the cutting edge of thermal technology due to their size, low capital, installation and O&M costs. This work presents the architecture components for the instrumentation, identification and control of a microturbine. Th
Publicado em: 2007
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10. Is human immunodeficiency virus/acquired immunodeficiency syndrome decreasing among Brazilian injection drug users? Recent findings and how to interpret them
We briefly review findings from Brazilian settings where the human immunodeficiency virus/acquired immunodeficiency syndrome (HIV/AIDS) epidemic among injection drug users (IDUs) seems to be decreasing, highlighting recent findings from Rio de Janeiro and discussing methodological alternatives. Former analyses using serologic testing algorithm for recent HIV
Memórias do Instituto Oswaldo Cruz. Publicado em: 2005-02
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11. Epitaxial hybrid ferromagnet-semiconductor structures: growth, structural and magnetic properties
Ferromagnet-semiconductor heterostructures are promising materials for the integration of magnetic or spin related functions into semiconductor materials and devices. Fe-on-GaAs and MnAs-on-GaAs are canditates for potential room temperature applications. We review our recent results on growth, structural and magnetic properties of these materials, and their
Brazilian Journal of Physics. Publicado em: 2004-06
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12. Mortality among injecting drug users: a critical reappraisal.
STUDY OBJECTIVE--The aim was to quantify all cause mortality among injecting drug users. DESIGN--This was a retrospective analysis of 1989 data on injecting drug users and mortality obtained from three independent agencies: the Procurator Fiscal's Office, the General Register Office, and the Scottish HIV-test register. SETTING--Greater Glasgow, Scotland. SUB