Study of RF-excited Diethylene Glycol Dimethyl Ether Plasmas by Mass Spectrometry

This paper deals with the study of the fragmentation process of diethylene glycol dimethyl ether (CH3O(CH2CH2O)(2)CH3) (diglyme here in) molecule in low pressure RF excited plasma discharges. The study was carried out using mass spectrometry. The results showed that for a fixed pressure, the increase of the RF power coupled to the plasma chamber from 1 to 35 W produced a plasma environment much more reactive which increases the population of the ionized species like CH3+ (15 amu), C2H4+ (28 amu), CH3O+ (31 amu), C2H4O+ (44 amu), CH3OCH2CH2+ (59 amu) and CH3OCH2CH2O+ (75 amu). This fact may be attributed to the increase of the electronic temperature that makes predominant the occurrence of inelastic processes that promotes molecular fragmentation. For a fixed value of RF power the increase of pressure from 50 mTorr to 100 mTorr produces the decreasing of the above mentioned chemical species due the lower electronic mean free path. These results suggest that if one wants to keep the monomer's functionality within the plasma deposited films resulting from such kind of discharges one must operate in low power conditions.

Barbados: public-private sector partnership

Includes bibliography

E-commerce environment and trade promotion for Latin America: policy implications from East Asian and advanced economies' experiences

Includes bibliography

Quality of Latin American and Caribbean industrialization and integration into the global economy

Includes bibliography

Glyphosate como regulador de crescimento em arroz de terras altas

The lodging of some rice cultivars at harvest time can lead to significant losses in yield, and the inappropriate water and nitrogen management, under high-tech conditions, can aggravate the problem. The use of vegetal regulators is an alternative to reduce lodging, however, information on this topic are rare. The study aimed to evaluate the application of glyphosate sub doses (26 g ha -1, 52 g ha -1, 78 g ha -1, 104 g ha -1, 130 g ha -1, 156 g ha -1, and 182 g ha -1) on agronomical traits, development, and yield of upland rice crops irrigated by aspersion, during the floral differentiation period. The experiment was carried out in Selvíria, Mato Grosso do Sul State, Brazil, through the agricultural years of 2008/2009 and 2009/2010. The increase of glyphosate sub doses, at the floral differentiation period of the Primavera cultivar, reduced the plants height, panicle size, and, consequently, yield. Sub doses higher than or equal to 78 g ha -1 eliminated the plants lodging process.

Development of silicon carbide substrates for aerospace applications

Payload and high-tech are important characteristics when the goals are aerospace applications. The development of the technologies associated to these applications has interests that transcend national boundaries and are of strategic importance to the nations. Ultra lightweight mirrors, supports and structures for optical systems are important part of this subject. This paper reports the development of SiC substrates, obtained by pressing, to be applied on embedded precision reflective optics. Different SiC granulometries, having YAG as sintering additive, were processed by: ball milling, drying and deagglomeration, sift, uniaxial and isostatic pressing, and, finally, argon atmosphere sintering at 1900°C. Different porosities were obtained according to the amount of organic material added. Into one side of the samples pellets of organic material were introduced to generate voids to reduce the weight of samples as a whole. The substrates were grinding and polished, looking for a SiC surface having low porosity, as porosity is directly related to light scattering that should be avoided on optical surfaces. Laser surface treatments were applied (using or not SiC barbotine) as a method to improve the surface quality. The samples were characterized by optical and laser confocal microscopy, roughness measurements and mechanical tests. The results are very promissory for future applications. © 2012 Materials Research Society.

Integration practices for the technological innovation of products: Case studies at two large technological companies

Studies on innovation and technology management have emphasized the importance of integration between the research and development (R&D) department and others involved with the product development process (PDP) as a relevant practice for the good performance of technological innovation of product activities. This study addresses the topic of transfers of technologies to new product projects and also integration practices between the R&D department and others involved with the PDP. A qualitative study was conducted that was operationalized through two case studies at large high-tech companies: One is Brazilian and the other is a multinational subsidiary in Brazil. Among its main result, this paper represents and analyzes management practices that are favorable to integration in product development projects that demand development and transfer of technologies, such as: participation of R&D personnel in market activities, the adoption of virtual interaction mechanisms, and the application of methods such as technology roadmaps. © Universidad Alberto Hurtado, Facultad de Economía y Negocios.

As influências do realismo político e do complexo industrial-militar no expansionismo norte americano (1990-2004)

Pós-graduação em História - FCLAS

A reprodução do capital imobiliário, os multicomplexos coorporativos e a elitização do espaço: o exemplo do Parque Cidade Jardim na cidade de São Paulo

Pós-graduação em Geografia - IGCE

Protótipo de sistema automotor para cadeira de rodas

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

CEPAL Review no.82

The devious maze of the international order: the importation of reforms / David Ibarra. -- Foreign banks in Latin America: a paradoxical result / Graciela Moguillansky, Rogerio Studart and Sebastián Vergara. -- A proposal for unitary taxes on the profits of transnational corporations / Andrew Mold. -- Regional integration and macroeconomic coordination in Latin America / Hubert Escaith. -- Import substitution in high-tech industries: Prebisch lives in Asia! / Alice H. Amsden. -- Industrial competitiveness in Brazil ten years after economic liberalization / João Carlos Ferraz, David Kupfer and Mariana Iootty. -- The influence of capital origin on Brazilian foreign trade patterns / Célio Hiratuka and Fernanda De Negri. -- Information and knowledge: the diffusion of information and communication technologies in the Argentine manufacturing sector / Gabriel Yoguel, Marta Novick, Darío Milesi, Sonia Roitter and José Borello. -- Local economic development and decentralization in Latin America / Francisco Alburquerque, in memory of Gabriel Aghón. -- Migrations, the labour market and poverty in Greater Buenos Aires / Rosalía Cortés and Fernando Groisman. -- Households, poverty and policy in times of crisis. Mexico, 1992-1996 / Benjamin Davis, Sudhanshu Handa and Humberto Soto. -- CEPAL Review on the Internet. -- Recent ECLAC publications.

Fatores críticos de baixa efetividade no planejamento estratégico das cidades: um estudo na região metropolitana do vale do paraíba e litoral norte

Pós-graduação em Engenharia Mecânica - FEG

Esverdeando a cadeia de suprimentos: algumas evidências de empresas localizadas no Brasil

The purpose of this article is to identify and analyze how Green Supply Chain Management (GSCM) practices have been adopted by high-tech companies located in Brazil in order to create guidelines to support similar companies to incorporate GSCM initiatives. This research was based on case studies carried out in some representative companies in this sector. The main results are: (a) the supply chain structure can affect both the adoption of GSCM practices and the way they are adopted, (b) the Brazilian environmental legislation and international policies are very important to boost the adoption of GSCM practices, and (c) based on the results obtained, for each one of the six GSCM practices, suggestions for a more appropriate adoption are offered to similar companies.

Internal Combustion Engine's Throttle Control as a Motivational Theme for Teaching Microprocessors Systems Lab Classes

The increased fuel economy and driveability of modern internal combustion engine vehicles (ICEVs) are the result of the application of advanced digital electronics to control the operation of the internal combustion engine (ICE). Microprocessors (and micro controllers) play a key role in the engine control, by precisely controlling the amount of both air and fuel admitted into the cylinders. Air intake is controlled by utilizing a throttle valve equipped with a motor and gear mechanism as actuator, and a sensor enabling the measurement of the angular position of the blades. This paperwork presents a lab setup that allows students to control the throttle position using a microcontroller that runs a program developed by them. A commercial throttle body has been employed, whereas a power amplifier and a microcontroller board have been hand assembled to complete the experimental setup. This setup, while based in a high-tech, microprocessor-based solution for a real-world, engine operation optimization problem, has the potential to engage students around a hands-on multidisciplinary lab activity and ignite their interest in learning fundamental and advanced topics of microprocessors systems.

Adoção de práticas de Green Supply Chain Management: mecanismos de indução e a importância das empresas focais

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