Anodic Stripping Voltammetric Determination of Lead (II) and Cadmium (II) by Using a Carbon Nanotubes Paste Electrode Modified with Ion Exchange Synthetic Resin

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Aplicação do earned value em projetos complexos - um estudo de caso na EMBRAER

O gerenciamento do Earned Value vem obtendo aceitação crescente nas empresas e entre profissionais tais como gerentes de projetos e funcionais, devido à sua efetividade no controle dos resultados do projeto. Earned Value é definido como uma ferramenta de controle que permite avaliar simultaneamente de maneira quantitativa como se encontram os custos e prazos em uma data de controle, permitindo também prever a data de término e o valor gasto (VARGAS, 2005). Este artigo avalia a aplicabilidade do earned value como ferramenta de controle de projetos aeronáuticos na EMBRAER. Contribui também para a aplicação do earned value no controle de projetos complexos. Utilizam-se como técnicas de coleta de dados: entrevistas, observações e análise documental. Conclui-se que o earned value é utilizado apenas nos projetos da área de aviação de defesa, por ser uma exigência contratual. O uso do earned value nas áreas de programas executivos e comerciais restringe-se às fases de definição conjunta, projeto detalhado e certificação, pois o escopo do projeto é bem definido, o cronograma é detalhado e os custos são previstos e obtidos com maior acuidade. Nas demais fases de desenvolvimento do produto, o uso do earned value é restrito, devido principalmente às constantes alterações de escopo do produto e do projeto.

Riscos nucleares e outros riscos: avaliação e aceitabilidade

The risks of accidents, illness and early death are part of life on Earth, which touches all living creatures, including Mankind. Because of modern mass communication media, the emotional impact of current risks are greater than in the past. Many unnecessary risk can and should be avoided, and with respect to other they can be drastically reduced. In addition to this, some risks should be confronted in order to avoid greater ones. In any risk analysis, eventual benefits should be taken into consideration, the risks surrounding other activities and other factors. Some risks examples and their implications are presented and discussed, in general. Nuclear energy is specifically treated, but it also refers and comments that which surrounds other human activities (airplanes, automobiles, smog, gasoline, DDT, and coal energy). As in the history of aviation, nuclear industry has a history of greater successes than failures. Nonetheless, in both cases, serious accidents deserve deep thought, including the increment of security norms. The current fear of some people to nuclear energy is compared to the unfounded fear at the advent of gasoline last century. Risks, naturally, should not be exagerated, but they cannot be discarded. The main intention of the author is to discuss the complexity of the problem, and to see that risks are evaluated and accepted. In relation to nuclear energy, the author only mentions his point of view, defended in other publications, that it involves very high risks.

The effect of the ocean water immersion and UV ageing on the dynamic mechanical properties of the PPS/glass fiber composites

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Aircraft accident in Brazil: Boeing vs. Legacy?

Air accidents represent a small proportion of the flights registered worldwide. Airplane collisions in the air are rare. In September of 2006, a Boeing 737-800 collided in midair with a Legacy Jet. It was the largest accident registered in the history of Brazilian aviation until that time. The present study explores aspects of press coverage of the accident. Data and information reported in the media about the accident from September 2006 to August 2007 were collected and discussed. Media coverage called attention to two unusual aspects: politicisation of the discussion, culminating in the opening of congressional inquiries, and equally the concomitance of police investigations interfering in the work of agencies responsible for the official accident investigation. Emphasis on assigning guilt and establishing penalties may close the windows of opportunity an accident had opened for discussions on the improvement of air safety. In Brazil, political imperatives and organizational pressures have interfered and the possibilities of organizational learning from the accident have been drastically curtailed.

Riscos nucleares e outros riscos: Avaliação e aceitabilidade

The risks of accidents, illness and early death are part of life on Earth, which touches all living creatures, including Mankind. Because of modern mass communication media, the emotional impact of current risks are greater than in the past. Many unnecessary risks can and should be avoided, and with respect to others, they can be drastically reduced. In addition to this, some risks should be confronted in order to avoid greater ones. In any risk analysis, eventual benefits should be taken into consideration, the risks surrounding other activities, and other factors. Some risks examples and their implications are presented and discussed, in general Nuclear energy is specifically treated, but it also refers and comments that which surrounds other human activities (airplanes, automobiles, smog, gasoline, DDT, and coal energy). As in the history of aviation, nuclear industry has a history of greater successes than failures Nonetheless, in both cases, serious accidents deserve deep thought, including the increment of security norms. The current fear of some people to nuclear energy is compared to the unfounded fear at the advent of gasoline last century Risks, naturally, should not be exagerated, but they cannot be discarded. The main intention of the author is to discuss the complexity of the problem, and to see that risks are evaluated and accepted. In relation to nuclear energy, the author only mentions his point of view, defended in other publications, that it involves very high risks.

Towards forecasting and mitigating ionospheric scintillation effects on GNSS

The effect of the ionosphere on the signals of Global Navigation Satellite Systems (GNSS), such as the Global Positionig System (GPS) and the proposed European Galileo, is dependent on the ionospheric electron density, given by its Total Electron Content (TEC). Ionospheric time-varying density irregularities may cause scintillations, which are fluctuations in phase and amplitude of the signals. Scintillations occur more often at equatorial and high latitudes. They can degrade navigation and positioning accuracy and may cause loss of signal tracking, disrupting safety-critical applications, such as marine navigation and civil aviation. This paper addresses the results of initial research carried out on two fronts that are relevant to GNSS users if they are to counter ionospheric scintillations, i.e. forecasting and mitigating their effects. On the forecasting front, the dynamics of scintillation occurrence were analysed during the severe ionospheric storm that took place on the evening of 30 October 2003, using data from a network of GPS Ionospheric Scintillation and TEC Monitor (GISTM) receivers set up in Northern Europe. Previous results [1] indicated that GPS scintillations in that region can originate from ionospheric plasma structures from the American sector. In this paper we describe experiments that enabled confirmation of those findings. On the mitigation front we used the variance of the output error of the GPS receiver DLL (Delay Locked Loop) to modify the least squares stochastic model applied by an ordinary receiver to compute position. This error was modelled according to [2], as a function of the S4 amplitude scintillation index measured by the GISTM receivers. An improvement of up to 21% in relative positioning accuracy was achieved with this technnique.

Os desafios da regulação do setor de transporte aéreo de passageiros no Brasil

Pós-graduação em Economia - FCLAR

Report of the Grenada national yachting consultation

The Economic Commission for Latin America and the Caribbean (ECLAC); Subregional Headquarters for the Caribbean embarked on a project "Development of a Subregional Marine-based Tourism Strategy" in 2001. The project, co-funded by the Government of the Netherlands, is aimed at the development of sustainable yachting tourism in the Eastern Caribbean and focuses on the island arc from the British Virgin Islands in the north to Trinidad and Tobago in the south. The project includes the conduct of national studies in the British Virgin Islands, St. Maarten, Antigua and Barbuda, Saint Lucia, Saint Vincent and the Grenadines, Grenada and Trinidad and Tobago. In all countries the national studies were preceded by consultations with the private and public sector and, following completion of the national reports, the findings were similarly discussed through a private and public sector consultation. On 26 March 2003, as part of the project's activities, a national consultation on yachting in Grenada was convened by the Ministry of Tourism, Civil Aviation, Culture, Social Security, Gender and Family Affairs in collaboration with the Marine and Yachting Association of Grenada (MAYAG); and ECLAC. One of the objectives of the consultation was to review the report "Grenada, Carriacou and Petit Martinique: The Yachting Sector" that was prepared by the ECLAC Subregional Headquarters of the Caribbean and co-sponsored by the Government of the Netherlands. A second objective included the provision of a forum for a private sector-government discussion on yachting and the pleasure boat industry and its contribution to Grenada. The final objective was the identification of ways and means to increase the contribution of yachting as a viable component of the tourism industry in Grenada.

Estudo do uso de ferramentas cerâmicas na usinagem de inconel 718

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Utilização de biodiesel animal em turbinas a gás

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

O estranho perfeito: a música orquestral de Franz Zappa. -

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Prospects for commercial air-navigation in South America

The ALADI - ECLAC Seminar Latin American Association for Integration - Economic Commission for Latin America and the Caribbean Santiago, Chile, 15-17 April, 1997 Experts from the public and private sectors of Brazil, Chile, Colombia, Paraguay, Peru, Uruguay, and Venezuela participated on a private basis in an open debate. Representatives from the International Association of Latin American Air Transport (AITAL), the Latin American Civil Aviation Commission (CLAC), and the International Civil Aviation Organization (OACI) also attended the meeting.The topics analyzed in the Seminar were: 1. The situation and prospects for international air-transport: policies and tendencies in the United States and the European Union. 2. South American sub-regional agreements. 3. The evolution of national policies in the region. 4. Structural changes in corporate management. 5. The use of commercial air-traffic rights. 6. Security in air-navigation. 7. The challenges facing regional airlines.

Estudo da vibração de corpo inteiro em pilotos de helicoptera esquilo AS-350 L1

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)