The in-bond assembly industry and technical change

Includes bibliography

A comparison of two nonlinear damping mechanisms in a vibration isolator

The vibration transmissibility characteristics of a single-degree-of- freedom (SDOF) passive vibration isolation system with different nonlinear dampers are investigated in this paper. In one configuration, the damper is assumed to be linear and viscous, and is connected to the mass so that it is perpendicular to the spring (horizontal damper). The vibration is in the direction of the spring. The second configuration is one in which the damper is in parallel with the spring but the damping force is proportional to the cube of the relative velocity across the damper (cubic damping). Both configurations are studied for small amplitudes of excitation, when some analysis can be conducted based on analytical expressions, and for large amplitudes of excitation, where the analysis is based on numerical simulations. It is found that the two nonlinear systems can outperform the linear system when force transmissibility is considered. However, for displacement transmissibility, the system with the horizontal damper exhibits some desirable properties, but the system with cubic damping does not. © 2012 Elsevier Ltd.

Design and development of a low-cost solar tracker

To become competitive, ultimately, photovoltaics should have its costs reduced and use photovoltaic systems of greater efficiency. The main steps in this direction are the use of new materials, the improvement in the manufacture of modules and the adoption of techniques of maximum power point tracking and of solar tracking. This article aims at presenting the project and development of an azimuth and elevation solar tracker, based on a new conception of the positioning sensor, composed of an array of four photoresistors. The two direct current motors that operate in the vertical and horizontal axes are controlled by a proportional-integral microcontroller. The conditions of the project were low cost, small energy consumption and versatility. The microcontroller can also incorporate a maximum power point tracking algorithm. The performance of solar tracker prototype in the initial phase of field tests can be considered appropriate. © Institution of Engineers Australia, 2013.

Optimal impulsive control in a powered Swing-By

This paper studies the problem of applying an impulsive control in a spacecraft that is performing a Swing-By maneuver. The objective is to study the changes in velocity, energy and angular momentum for this maneuver as a function of the three usual parameters of the standard Swing-By plus the three parameters (the magnitude of the impulse, the point of its application and the angle between the impulse and the velocity of the spacecraft) that specify the impulse applied. The dynamics used is the restricted three body problem under the regularization of Lemaitre, made to increase the accuracy of the numerical integration near the primaries. The present research develops an algorithm to calculate the variation of energy and angular momentum in a maneuver where the application of the impulsive control occurs before or after the passage of the spacecraft by the periapsis, but within the sphere of influence of the secondary body and in a non-tangential direction. Using this approach, it is possible to find the best position and direction to apply the impulse to maximize the energy change of the total maneuver. The results showed that the application of the impulse at the periapsis and in the direction of motion of the spacecraft is usually not the optimal solution.

Probing the infraed behavior of the ghost-gluon vertex in quantum chromodynamics

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

O adolescer pós-moderno: novos paradigmas na medicina

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

The employment situation in Latin America and the Caribbean: Crisis and the labour market

Since the financial and economic crisis began to affect the real economy and spread throughout the world, the region’s economies have been faced with a situation where data on employment and labour reflect the real stories of millions of women and men for whom the future has become uncertain. When these problems began to appear, the International Labour Organization (ILO) warned that the world faced a global employment crisis whose consequences could lead to a social recession. As the Economic Commission for Latin America and the Caribbean (ECLAC) has pointed out, the outbreak of the crisis put an end to a five-year period of sustained growth and falling unemployment. As early as the second half of 2008, the figures began to reflect slowing economic growth, while a downward slide began in the labour market. This initial bulletin, produced jointly by ECLAC and ILO, seeks to review the ways in which the crisis is affecting the region’s labour markets. Amidst a situation characterized by shocks and uncertainty, governments and social partners must have the inputs needed for designing public policies to increase the population’s levels of employment and well-being. It is planned to produce two further bulletins by January 2010, in order to measure the impact of the crisis on employment and provide an input to the process of defining the best public policies to reverse its consequences. The bulletin reviews the most recent available indicators and analyses them in order to establish trends and detect variations. It provides statistics for the first quarter, estimates for the rest of 2009, and a review of policies announced by the Governments. In 2008, the last year of the growth cycle, the region’s urban unemployment stood at 7.5%. According to economic growth forecasts for 2009, the average annual urban unemployment rate for the region will increase to between 8.7% and 9.1%; in other words, between 2.8 million and 3.9 million additional people will swell the ranks of the unemployed. Data for the first quarter of 2009 already confirm that the crisis is hitting employment in the region. Compared with the first quarter of 2008, the urban unemployment rate was up by 0.6 percentage points, representing over a million people.Work will continue until September 2009 on the preparation of a new report on the employment situation, using data updated to the first half of 2009. This will provide a picture of the region’s employment situation, so that growth and employment projections can be adjusted for 2009 as a whole. Strategies for dealing with the crisis must have jobs and income protection as their central goals. Policies are moving in that direction in Latin America and the Caribbean and, if they are effective, an even greater worsening of the situation may be avoided. Labour produces wealth, generates consumption, keeps economies functioning and is a key factor in seeking out the way to more sustainable and equitable growth once the crisis is past.

Impacto de programas de formação continuada da Secretaria Estadual de Educação de São Paulo na gestão escolar

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Tomografia eletromagnética para caracterização de reservatórios de hidrocarbonetos

Na produção de petróleo é importante o monitoramento dos parâmetros do reservatório (permeabilidade, porosidade, saturação, pressão, etc) para o seu posterior gerenciamento. A variação dos parâmetros dinâmicos do reservatório induz variações na dinâmica do fluxo no reservatório, como por exemplo, perdas na pressão, dificultando o processo de extração do óleo. A injeção de fluidos aumenta a energia interna do reservatório e incrementa a pressão, estimulando o movimento do óleo em direção aos poços de extração. A tomografia eletromagnética poço-a-poço pode se tomar em uma técnica bastante eficaz no monitoramento dos processos de injeção, considerando-se o fato de ser altamente detectável a percolação de fluidos condutivos através das rochas. Esta tese apresenta o resultado de um algoritmo de tomografia eletromagnética bastante eficaz aplicado a dados sintéticos. O esquema de imageamento assume uma simetria cilíndrica em torno de uma fonte constituída por um dipolo magnético. Durante o processo de imageamento foram usados 21 transmissores e 21 receptores distribuídos em dois poços distanciados de 100 metros. O problema direto foi resolvido pelo método dos elementos finitos aplicado à equação de Helmhotz do campo elétrico secundário. O algoritmo resultante é válido para qualquer situação, não estando sujeito às restrições impostas aos algoritmos baseados nas aproximações de Born e Rytov. Por isso, pode ser aplicado eficientemente em qualquer situação, como em meios com contrastes de condutividade elétrica variando de 2 a 100, freqüências de 0.1 a 1000.0 kHz e heterogeneidades de qualquer dimensão. O problema inverso foi resolvido por intermédio do algoritmo de Marquardt estabilizado. A solução é obtida iterativamente. Os dados invertidos, com ruído Gaussiano aditivo, são as componentes em fase e em quadratura do campo magnético vertical. Sem o uso de vínculos o problema é totalmente instável, resultando em imagens completamente borradas. Duas categorias de vínculos foram usadas: vínculos relativos, do tipo suavidade, e vínculos absolutos. Os resultados obtidos mostram a eficiência desses dois tipos de vínculos através de imagens nítidas de alta resolução. Os tomogramas mostram que a resolução é melhor na direção vertical do que na horizontal e que é também função da freqüência. A posição e a atitude da heterogeneidade é bem recuperada. Ficou também demonstrado que a baixa resolução horizontal pode ser atenuada ou até mesmo eliminada por intermédio dos vínculos.

O Programa Escola de Tempo Integral na região de Assis: implicações para a qualidade do ensino

Pós-graduação em Educação - FFC

Automatização aplicada a lançadores de foguete de sondagem para compensação da influência dos ventos

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Effects of rotation in the laser-pulse photoassociation in a thermal gas of atoms

Photoassociation is a possible route for the formation of chemical bonds. In this process, the binding of colliding atoms can be induced by means of a laser field. Photoassociation has been studied in the ultracold regime and also with temperatures well above millikelvins in the thermal energy domain, which is a situation commonly encountered in the laboratory. A photoassociation mechanism can be envisioned based on the use of infrared pulses to drive a transition from free colliding atoms on the electronic ground state to form a molecule directly on that state. This work takes a step in this direction, investigating the laser-pulse-driven formation of heteronuclear diatomic molecules in a thermal gas of atoms including rotational effects. Based on the assumption of full system controllability, the maximum possible photoassociation yield is deduced. The photoassociation probability is calculated as a function of the laser parameters for different temperatures. Additionally, the photoassociation yield induced by subpicosecond pulses of a priori fixed shape is compared to the maximum possible yield.

Effect of Pursed-Lip Breathing in Patients With COPD: Linear and Nonlinear Analysis of Cardiac Autonomic Modulation

Objective: The aim of the present study was to evaluate the effect of pursed-lip breathing (PLB) on cardiac autonomic modulation in individuals with chronic obstructive pulmonary disease (COPD) while at rest. Methods: Thirty-two individuals were allocated to one of two groups: COPD (n = 17; 67.29 +/- 6.87 years of age) and control (n = 15; 63.2 +/- 7.96 years of age). The groups were submitted to a two-stage experimental protocol. The first stage consisted of the characterization of the sample and spirometry. The second stage comprised the analysis of cardiac autonomic modulation through the recording of R-R intervals. This analysis was performed using both nonlinear and linear heart rate variability (HRV). In the statistical analysis, the level of significance was set to 5% (p = 0.05). Results: PLB promoted significant increases in the SD1, SD2, RMSSD and LF (ms(2)) indices as well as an increase in alpha(1) and a reduction in alpha(2) in the COPD group. A greater dispersion of points on the Poincare plots was also observed. The magnitude of the changes produced by PLB differed between groups. Conclusion: PLB led to a loss of fractal correlation properties of heart rate in the direction of linearity in patients with COPD as well as an increase in vagal activity and impact on the spectral analysis. The difference in the magnitude of the changes produced by PLB between groups may be related to the presence of the disease and alterations in the respiration rate.

Plano de gerenciamento sustentável dos resíduos de construção civil. O caso de Rio Claro (SP)

The current problematic of the construction and demolition (C&D) waste faced for the Brazilian cities, is one of the main degradation factors of the environment, over all about the promise of the urban ambient quality. This scenery must mainly to the unsustainable management adopted by the great majority of the Brazilian cities. Therefore, this work aims at to offer subsidies for medium cities, having as study object the city of Rio Claro-SP, (Brazil), in the elaboration of plans and integrated programs of sustainable management of the construction and demolition waste, in accordance with CONAMA Resolution nº 307/2002, that’s set up a sustainable management system of C&D waste. In this direction, the diagnosis of the management was elaborated for the city of Rio Claro, (generation, collects, transport and disposal) and the public administration of the construction and demolition waste, as well as of the study of the related aspects with C&D waste recycling plant. Later, was suggested a plan of improvements for the public manager of C&D waste: areas of temporary disposal to facility the appropriating destination, appropriated areas of final disposal, incentives to the recycling of C&D waste, new legislations, education and orientation programs and adequacy the agents of C&D waste management (generating, transporting, addressee and public manager), directing for an environmental, economic and social sustainability.

Tar reduction in downdraft biomass gasifier using a primary method

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)