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Análise de disponibilidade de turbinas a gás empregadas em usinas termelétricas a ciclo combinado.; Analysis of availability for gas turbines used in thermoelectrical power plant.

Guevera Carazas, Fernando Jesús
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 24/05/2006 PT
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35.91%
As usinas termelétricas a ciclo combinado empregadas na geração de energia elétrica são compostas basicamente por três elementos ou sistemas: a Turbina a Gás, a Caldeira de Recuperação e a Turbina a Vapor. A Turbina a Gás é responsável pela transformação da energia química do combustível em energia mecânica para acionar os geradores, e os gases de escapamento com alta temperatura são responsáveis pela geração de vapor para as turbinas de vapor nas caldeiras de recuperação. É por estes motivos que é importante manter disponível a Turbina a Gás. A disponibilidade de um sistema está relacionada com a confiabilidade dos seus componentes e com as políticas de manutenção associadas aos mesmos, que não só influenciam no tempo de retorno à operação após uma ação de manutenção programada ou não programada, como também na degradação da confiabilidade do sistema. Este trabalho apresenta um método de análise empregado para a estimativa da confiabilidade e disponibilidade de Turbinas a Gás empregadas em usinas termelétricas a ciclo combinado, baseado nos conceitos de Confiabilidade e Manutenção Centrada em Confiabilidade. O método baseia-se na avaliação dos tempos entre falhas das causas destas falhas...

"Produção de óleo diesel limpo a partir do gás natural: estudo de viabilidade técnico-econômica para a instalação de uma planta GTL (gas-to-liquids) no Brasil"; Production of liquid hydrocarbons employing Natural Gas: a study of the technical and economical feasibility of a GTL plant in Brazil

Callari, Roberto
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 26/02/2007 PT
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45.98%
CALLARI. R. Produção de óleo diesel limpo a partir do gás natural: estudo de viabilidade técnico-econômica para a instalação de uma planta gtl (gas-to-liquids) no Brasil. 2007. 84 p. Tese de Mestrado ? Programa Interunidades de Pós-Graduação em Energia. Universidade de São Paulo. A tecnologia de produção de combustíveis sintéticos iniciou seu desenvolvimento a partir de 1919, na Alemanha, tendo o carvão mineral como insumo para a gaseificação. Este processo conhecido como Gas-To-Liquids (GTL) é uma transformação química que gera produtos líquidos e estáveis à temperatura e pressão ambientes. Essa transformação pode ser realizada no próprio local de produção do gás, evitando investimentos e problemas ambientais na construção de gasodutos. No Brasil, o gás natural apresenta crescente incremento da sua produção, e forte aumento das suas reservas, tanto associado quanto não-associado ao petróleo. Dessa forma, como as estruturas de plataformas normalmente se localizam em áreas remotas, torna-se custoso o aproveitamento desse gás que é liberado pela produção do óleo, sendo o mesmo queimado ou ventado. Devido às restrições estabelecidas pela legislação ambiental, a queima do gás natural nas plataformas de produção passa a ser problemática e crítica. Este trabalho visa avaliar a economicidade da implantação de uma planta para a produção de GTL no Brasil...

Separação gravitacional de gás em um duto anular inclinado: estudo experimental e modelagem fenomenológica; Gravitational gas separation in an inclined annular channel: experimental study and phenomenological modeling

Vidal, Luis Enrique Ortiz
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 22/04/2010 PT
Relevância na Pesquisa
35.93%
O presente trabalho apresenta um estudo associado à separação de gás para escoamento gás-líquido em um duto anular inclinado. Esse tipo de escoamento e geometria são encontrados em separadores de gás do tipo shroud invertido na indústria de petróleo quando utilizadas técnicas de bombeamento para a exploração de poços. A presença de gás livre a montante da bomba é uma das maiores limitações dos sistemas de bombeamento, por acarretar cavitação e falhas dinâmicas nos equipamentos. O presente estudo tem por objetivo garantir a separação total de gás livre a montante da bomba através da proposição de um separador do tipo shroud invertido em tubulação inclinada para aplicação na exploração de petróleo em poços direcionais. Um estudo experimental com ar e água como fluidos de trabalho a pressão quase atmosférica foi desenvolvido visando a compreensão da fenomenologia do separador shroud invertido. Foram observados escoamentos em duto anular do tipo: bifásico gás-líquido ascendente, monofásico em canal livre e bifásico gás-líquido descendente devido ao fenômeno de aeração; foram coletados também dados de eficiência de separação em função do ângulo de inclinação, vazão do líquido e queda de pressão entre o shroud e a saída do tubo de produção. Encontrou-se uma variável de extrema importância no fenômeno de separação até agora não reportada na literatura: o nível do anular interno do shroud (NAI). Um modelo fenomenológico que prevê a separação total do gás foi desenvolvido a partir da interpretação dos fenômenos físicos observados experimentalmente. Uma correlação inédita para a modelagem do fenômeno de dissipação de energia cinética turbulenta vinculado à separação do gás é proposta. O modelo foi validado qualitativamente com dados da literatura e ajustado com os dados coletados neste trabalho...

Petrologia e geoquímica das camadas de carvão e sua relação com gás natural determinado no poço CBM 001-ST-RS, Bacia do Paraná

Levandowski, Janaina Hugo
Fonte: Universidade Federal do Rio Grande do Sul Publicador: Universidade Federal do Rio Grande do Sul
Tipo: Dissertação Formato: application/pdf
POR
Relevância na Pesquisa
35.91%
O objetivo desse estudo é caracterizar química e petrograficamente as camadas de carvão da jazida Santa Terezinha (Formação Rio Bonito, Bacia do Paraná) e sua relação com o gás natural associado com as camadas de carvão (CBM) determinado no poço CBM 001-ST-RS. Para tanto, primeiramente realizou-se uma sondagem-teste para coleta de testemunhos e em seguida fez-se medidas de desorção do gás natural associado com as camadas de carvão para determinar o conteúdo de gás total. Além disso, foram feitas análises petrográficas (análise de macerais e reflectância da vitrinita) e análises químicas (análise imediata, teor de enxofre, poder calorífico, difração de raio-X, fluorescência de raio-X) no carvão além de testes de adsorção (para CH4 e CO2) e análise de isótopos (C e H) e composição do gás. As análises petrográficas mostram um rank de betuminoso alto volátil C até semi-antracita enquanto que entre os grupos de macerais houve o predomínio da vitrinita e inertinita. Quanto à análise imediata, as amostram mostram um enriquecimento nas cinzas (34,43 até 92,7% em peso), já o poder calorífico varia de 170 a 6265Kcal/Kg e o teor de enxofre apresenta uma grande variação entre 0,12% e 7,68% em peso. A matéria mineral...

Código computacional para análise de sistemas de cogeração com turbinas a gás

Antunes, Júlio Santana
Fonte: Universidade Estadual Paulista (UNESP) Publicador: Universidade Estadual Paulista (UNESP)
Tipo: Tese de Doutorado Formato: 157 f. : il.
POR
Relevância na Pesquisa
35.95%
Pós-graduação em Engenharia Mecânica - FEG; Este trabalho apresenta as fases do desenvolvimento de um programa computacional elaborado com a finalidade de selecionar, dimensionar e especificar sistemas de cogeração com turbinas a gás, buscando satisfazer as demandas térmicas do processo (operação em paridade térmica). As configurações utilizadas são: turbina a gás associada à caldeira de recuperação, turbina a gás associada ao sistema de refrigeração por absorção e turbina a gás associada à caldeira de recuperação e turbina a vapor (ciclo combinado). O programa computacional seleciona sistemas de turbinas a gás comercialmente disponíveis no mercado (condições ISO) e faz correções de performance para as condições ambientais do local da instalação. O código computacional efetua análises energéticas, exergéticas, energoeconômicas e exergoeconômicas, sempre buscando escolher os melhores sistemas de turbinas a gás dentre os previamente selecionados.; This work presents the steps to structure a computer program for selecting, dimension and specifying gas turbine cogeneration systems, satifying the termical condition of the process. The following configurations are used: gas turbine associated to the heat recovering...

Uso dos ciclos rankine orgânicos para o aproveitamento do calor residual em instalações de produção de petróleo e gás

Torres, Julian Esteban Barrera
Fonte: Universidade Federal de Santa Catarina Publicador: Universidade Federal de Santa Catarina
Tipo: Dissertação de Mestrado Formato: 158 p.| il., grafs., tabs.
POR
Relevância na Pesquisa
35.93%
Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico, Programa de Pós-Graduação em Engenharia Mecânica, Florianópolis, 2014.; A presente dissertação contempla o melhoramento do desempenho energético de uma plataforma de processamento de óleo e gás por meio da incorporação hipotética de um ciclo Rankine orgânico (ORC). Esse ciclo termodinâmico recuperaria parte do calor residual associado aos gases de exaustão das turbinas na planta, para geração de potência adicional, permitindo um decréscimo na carga das mesmas e, portanto no consumo de combustível. O modelamento do processo foi desenvolvido com o propósito de caracterizar a operação normal da plataforma e assim estabelecer as condições de referência para comparar o desempenho energético da mesma. A partir da informação obtida do modelo, uma análise exergética permitiu identificar as operações com maior irreversibilidade e também com potencial para recuperação da exergia perdida. Além disso demonstrou diferenças significativas na ordem de grandeza entre os fluxos de exergia associados às correntes de óleo e gás produzidos e as demais correntes relacionadas com o seu processamento. Considerando isto, foram considerados três indicadores de eficiência...

Matrizes poliméricas puras e modificadas para adsorção do gás sulfeto de hidrogênio

Oliveira, Marconi Sandro Franco de
Fonte: Universidade Federal do Rio Grande do Norte; BR; UFRN; Programa de Pós-Graduação em Química; Físico-Química; Química Publicador: Universidade Federal do Rio Grande do Norte; BR; UFRN; Programa de Pós-Graduação em Química; Físico-Química; Química
Tipo: Dissertação Formato: application/pdf
POR
Relevância na Pesquisa
35.92%
The underground natural gas found associated or not with oil is characterized by a mixture of hydrocarbons and residual components such as carbon dioxide (CO2), nitrogen gas (N2) and hydrogen sulfide (H2S), called contaminants. The H2S especially promotes itself as a contaminant of natural gas to be associated with corrosion of pipelines, to human toxicity and final applications of Natural Gas (NG). The sulfur present in the GN must be fully or partially removed in order to meet the market specifications, security, transport or further processing. There are distinct and varied methods of desulfurization of natural gas processing units used in Natural Gas (UPGN). In order to solve these problems have for example the caustic washing, absorption, the use of membranes and adsorption processes is costly and great expenditure of energy. Arises on such findings, the need for research to active processes of economic feasibility and efficiency. This work promoted the study of the adsorption of sulfide gas in polymer matrices hydrogen pure and modified. The substrates of Poly(vinyl chloride) (PVC), poly(methyl methacrylate) (PMMA) and sodium alginate (NaALG) were coated with vanadyl phosphate compounds (VOPO4.2H2O), vanadium pentoxide (V2O5)...

Vietnam : Framework for Thermal BOT Tenders and Strategy for Gas Coordination and Harmonization with Market Roadmap, Volume 1

World Bank
Fonte: Washington, DC Publicador: Washington, DC
EN_US
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45.88%
The purpose of this Volume 1 report is to explore how development of the gas andelectricity sectors can be better coordinated within this dynamic environment. In particular,this report aims to: Briefly outline the gas resources and developments in Vietnam, and describe the current institutional arrangements for the gas sector and how they relate to overall gas and electricity planning; Identify key gas sector issues as they relate to gas and electricity sector planning in general and BOT electricity generation project development, and in particular identify the development and operating risks for a BOT electricity generation project developer and suggest mitigation measures for these risks ;Suggest mechanisms to improve gas and electricity planning coordination. Present a case study that illustrates some of the gas and electricity planning issues and how these would be addressed if the suggested planning changes were implemented. This assignment has been undertaken during a period of unprecedented change in Vietnam. The electricity sector is part way through the complex process of introducing a market. In global world energy markets...

Cameroonian LP Gas Sector Study

Belgedj, Mourad; Merklein, H.A.; Nkoto-Angoula, Joël
Fonte: World Bank, Washington, DC Publicador: World Bank, Washington, DC
EN_US
Relevância na Pesquisa
55.93%
This study is a small-scale follow-up to an earlier World Bank study that analyzed the market failure of LPG in Nigeria and developed a roadmap to develop the use of LPG in that country to its full potential. Given the success of the Nigerian LPG work, it seemed obvious that other oil and gas-producing countries could benefit from the insights gained in Nigeria. Not unlike Nigeria, Cameroon has a thriving oil industry, yet it continues to flare most of its associated gas, burning more than enough LPG in the process to meet all its domestic needs and leave more for exports, while at the same time, it is importing LPG at world prices. Clearly, ifany country qualifies for an LPG policy review, it is Cameroon.

LP Gas Sector Improvement Studies : Cameroon, Ghana, Nigeria

World Bank
Fonte: Washington, DC Publicador: Washington, DC
EN_US
Relevância na Pesquisa
45.87%
This report is a sequel to the Nigerian LP Gas Sector Improvement Study of 2004,which was produced by the World Bank Oil and Gas Policy Division with funding under the Energy Sector Management Assistance Programme (ESMAP). The objective of the Nigerian study was to investigate and identify reasons for the failure of the LPG market in Nigeria to live up to its potential, to develop a strategy for reviving Nigeria s domestic LPG market, and to expand LPG access to all, including to the poor, in Nigeria.

Breathing Clean : Considering the Switch to Natural Gas Buses

Kojima, Masami
Fonte: Washington, DC: World Bank Publicador: Washington, DC: World Bank
EN_US
Relevância na Pesquisa
35.93%
In response to emerging epidemiological evidence of the toxicity of diesel vehicular emissions, there is growing interest in substituting conventional diesel with much cleaner natural gas in cities where ambient concentrations of particulate matter are markedly higher than what is internationally considered acceptable. This paper compares the performance of natural gas and conventional diesel buses, and outlines the barriers to the adoption of natural gas buses in developing countries. In the absence of emissions standards that effectively require natural gas, natural gas-fueled buses are unlikely to be adopted because they are more expensive to operate relative to diesel buses. The social case for replacing diesel with natural gas a fuel for buses rests on environmental grounds. If a local government decides that the reduction in air pollution associated with the substitution of conventional diesel with natural gas for use in buses is worth the cost, then it needs to adopt policies to encourage the switch to natural gas. These might include emissions standards for buses...

Associated Gas Utilization via miniGTL

World Bank
Fonte: Washington, DC Publicador: Washington, DC
Tipo: Relatório
EN_US
Relevância na Pesquisa
66.01%
The flaring of natural gas produced as part of crude oil production operations is a well-known practice which increasingly becomes a non-acceptable option around the globe. In 2010, the Global Gas Flaring Reduction Partnership (GGFR) at the World Bank reported that nearly 5TCF (trillion standard cubic feet or 135 billion cubic meters) of associated gas (AG) was flared worldwide, equal to 20 percent of US consumption emitting 320MM tons of unnecessary CO2 into the atmosphere. This paper provides a high-level overview of the status of gas conversion technologies that are developed for, or are applicable to, the monetization of associated gas. Gas conversion technology is but one out of about half a dozen options to manage or utilize AG such as gas re-injection, power production, compressed natural gas (CNG), liquefied natural gas (LNG) and pipelines. More than 15 technologies were evaluated analyzing the overall technology approach, the strengths and weaknesses of the technology, commercial readiness and technical risk along with product acceptance issues and high level economic attractiveness. The gas volume application range was from sub 1 MMscfd (million standard cubic feet per day) to a maximum of 25MMscfd with the sweet spot at 15MMscfd. The in depth evaluation was based on both publicly available information from websites...

Associated Gas Monetization via miniGTL

Fleisch, Theodor Hermann
Fonte: World Bank, Washington, DC Publicador: World Bank, Washington, DC
Tipo: Trabalho em Andamento
EN_US
Relevância na Pesquisa
45.85%
The large scale conversion of natural gas to liquid fuels (GTL) and chemicals (GTC), collectively called ‘miniGTL’ for convenience in this report - has been practiced for decades. For instance, a world scale GTL plant can convert 300 MMscfd of gas into 30,000bpd of diesel or gasoline while a world scale methanol plant produces about 2500tpd of methanol from about 75 MMscfd of gas. Over the last few years, miniGTL technologies have been developed to monetize smaller volumes of gas (less than 25 MMscfd) and thereby offer opportunities to extinguish flares. The engineering of such plants focuses on modular design, simplicity, automation and robustness of operation. In our first study reported in February 2012, a small number of companies with commercially viable options were identified, while others needed more time for RD to demonstrate their technologies. Now, two years later, Oberon Fuels, Velocys and CompactGTL are on the brink of multiple commercial plants. The progress of all companies reviewed in our first report will be discussed. This report contains the most comprehensive study of miniGTL technologies available today. Over 24 companies have been reviewed and are described in some detail. The goal of this study is the identification of companies that provide relatively low risk...

Azerbaijan : Issues and Options Associated with Energy Sector Reform

World Bank
Fonte: Washington, DC Publicador: Washington, DC
Tipo: Economic & Sector Work :: Energy Study; Economic & Sector Work
ENGLISH; EN_US
Relevância na Pesquisa
35.94%
The energy sector plays a significant role in the overall economy of Azerbaijan, as in other transition countries, and the World Bank's experience suggests that without energy sector reform and financial viability the transition process is much more difficult and delayed. The objective of this report, therefore, is to outline the issues and options facing Azerbaijan as it develops and implements its agenda for reform of the energy sector in order to inform the country's dialogue on this subject and the associated decision making process. The report focuses on seven key topics: Oil Revenue Management; The Petroleum Sector; The Gas Sector; The Power Sector; The Regulatory Environment; Energy and the Environment; And Social Issues in the Energy Sector. Each section of the report can be read as a stand-alone document; as a result there is some duplication between sections. Each section includes a summary followed by a more detailed discussion of the issues and options. Moreover three appendices are included. The first discusses the factors influencing oil prices, the second outlines the liberalization process and the regulatory models adopted for the gas sector in a number of locations and the third summarizes The State Program for the Development of the Fuel and Energy Sector of the Azerbaijan Republic (2005 - 2015).

Yemen : A Natural Gas Incentive Framework

World Bank
Fonte: Washington, DC Publicador: Washington, DC
Tipo: Economic & Sector Work :: Mining/Oil and Gas; Economic & Sector Work
ENGLISH; EN_US
Relevância na Pesquisa
45.88%
Yemen is planning to export gas through Yemen Liquefied Natural Gas (YLNG) starting from 2009. Yemen is also aiming to develop the domestic gas market, in particular gas-to-power. Liquefied Natural Gas (LNG) export revenue and domestic gas sales are expected to partially offset the decline in crude oil revenue from currently producing fields. The development of a gas sector has the potential to substantially contribute to Yemen's economic growth and fiscal revenue generation. Because of the high risk and considerable investment involved in developing a gas sector, attracting foreign capital and expertise will be essential. To this end, in addressing the public interest and developing the preferred policies, Yemen should ensure that decisions on project development and technologies will be based on their economic merits, and gas will be allowed to find its highest value market.

Harnessing African Natural Gas : A New Opportunity for Africa's Energy Agenda?

Santley, David; Schlotterer, Robert; Eberhard, Anton
Fonte: World Bank, Washington, DC Publicador: World Bank, Washington, DC
Tipo: Publications & Research :: Working Paper; Publications & Research
ENGLISH; EN_US
Relevância na Pesquisa
45.88%
Sub-Saharan Africa's persistent power shortages act as a severe constraint on its economic and human development. Over the last several years, a series of major offshore gas discoveries in Mozambique and Tanzania have rekindled interest in expanding the use of natural gas to address the continent's power shortages. Once thought of as a Nigeria-only story, gas-to power in Sub-Saharan Africa is now being considered in a continent-wide context, both as a supplement to Africa's abundant hydropower resources and as a replacement for more carbon intensive coal and liquid fuels. But the concentration of gas resources in just a few countries and the virtual absence of gas transportation infrastructure create economic challenges to the wider adoption of gas as a power generation fuel, particularly in smaller countries that cannot achieve economies of scale in gas production and transportation. As a result, the timeline between the discovery of gas and its commercialization is often measured in decades. This study examines the economic conditions facing policy makers...

Regional Gas Trade Projects in Arab Countries, Volumes 1 and 2

World Bank
Fonte: Washington, DC Publicador: Washington, DC
Tipo: Economic & Sector Work :: Mining/Oil and Gas; Economic & Sector Work
ENGLISH; EN_US
Relevância na Pesquisa
45.95%
Arab countries hold about 29 percent of the world's proven gas reserves, but every country (except Qatar and Algeria) is short of the gas supply needed to meet its current and projected demand. The rapid growth in gas demand is mostly a consequence of a sharp increase in electricity consumption. Gas trade in the Arab world has been dominated by the objective of exporting gas in the form of liquefied natural gas (LNG) to points in Asia, Europe, and North America. Gas trade within the region is limited to rather small volumes, moved from Algeria to Tunisia and Morocco; from Egypt to Jordan, Syria, and Lebanon; and from Qatar to the United Arab Emirates (UAE) - all through pipelines. The shortage of gas in the Arab countries has become more pronounced, justifying the higher gas prices needed to secure imported gas or to encourage domestic gas production. Such changes in the landscape provide an impetus for the Arab world to optimize the region's gas resources, at least partly on the basis of meeting growing regional demand. The objective of this study is to assist the attempt by: (i) identifying the opportunities for gas trade through cross-border gas pipelines and LNG; (ii) assessing the economic and political aspects of the identified projects; (iii) presenting financing and implementation schemes that utilize the synergy between the public and private sector in project formulation and development; and (iv) reviewing the legal...

Vietnam - Gas Sector Development Framework : Final Report

World Bank
Fonte: Washington, DC Publicador: Washington, DC
Tipo: Economic & Sector Work :: Other Environmental Study
ENGLISH
Relevância na Pesquisa
45.88%
Vietnam's gas sector is at a critical point. Vietnam's gas industry, from the producing field to the end-user, is already a vital component of the nation's energy economy and has the potential for major growth. Successes in the past decade have created a strong prospective demand for gas. However, Vietnam has begun to experience gas shortages. If the gas sector is to meet the rising demand for gas, there are challenges that must be addressed promptly. If certain key decisions are not made soon, these gas shortages can be expected to worsen with potentially serious economic impacts. To achieve its stated objectives for developing national gas resources, Vietnam must seek to create a 'moving train' of projects that will convert gas resources into proven reserves and production. It must also stimulate investment in the development of the requisite pipeline infrastructure as well as incentivize investment in gas consuming loads downstream such as power plants. And this will require gas pricing in consuming sectors (particularly the electricity sector) to be appropriately linked with gas pricing in the upstream gas exploration and production sector. Much remains to be done if Vietnam is to realize the potential it sees in its gas resources. This report proposes a vision...

Review of the Master Plan for Gas Development in Southern Vietnam

World Bank
Fonte: Washington, DC Publicador: Washington, DC
Tipo: Economic & Sector Work :: Other Infrastructure Study; Economic & Sector Work
ENGLISH; EN_US
Relevância na Pesquisa
45.87%
This report is prepared under contract to the World Bank as part of a review of PetroVietnam's (PV's) Gas Master Plan (GMP) for Southern Vietnam for the period 2006-2015, with an orientation to 2020. The review is to consider, in particular, the realism of the Master Plan, whether it represents the best use of resources both natural and financial and the sustainability of the plan in the context of development in Southern Vietnam. It should review constraints and opportunities and identify any shortcomings which are critical to achievement of the GMP. This Workshop Version Report has been prepared following the receipt of comments on a previous Inception Report from the World Bank and Vietnam's Ministry of Industry (MOI) and is an updated version of that report.

A prospective study of the association between home gas appliance use during infancy and subsequent dust mite sensitization and lung function in childhood

Ponsonby, Anne-Louise; Dwyer, Terence; Kemp, Andrew; Couper, David; Cochrane, Jennifer; Carmichael, Allan
Fonte: Blackwell Publishing Ltd Publicador: Blackwell Publishing Ltd
Tipo: Artigo de Revista Científica
Relevância na Pesquisa
35.92%
Background: Home gas appliance use has been associated with child respiratory illness but prospective data on the relationship between infant exposure and the development of child allergic disease has not been readily available. Objectives: (a) To determine if home gas appliance use is associated with increased risk of house dust mite (HDM) sensitization. (b) To examine whether any association between current home gas use and airway obstruction is influenced by HDM sensitization. Methods: Design: an 8-year follow-up birth cohort study of children born during 1988 and 1989. Participants: a population-based sample (n=498) of children who participated in the Tasmanian Infant Health Survey (TIHS) and resided in Northern Tasmania in 1997 (84% of eligible children). Main outcome measures: (a) Skin prick test reaction to nine allergens, including Dermatophagoides pteronyssinus (Der p 1) and Dermatophagoides farinae (Der f 1). (b) Spirometric lung function indices, including forced expiratory volume in one second (FEV1) and forced vital capacity (FVC). Results: The relative risk for home gas appliance use at 1 month of age and HDM sensitization was 1.98 (1.04, 3.79) in a cohort analysis with confounder matching. Current home gas use was also associated with HDM sensitization (ARR 1.73 (1.43...