Unit Operations
Mostrando 13-24 de 77 artigos, teses e dissertações.
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13. SMART MONITORING AND DECISION MAKING FOR REGULATING ANNULUS BOTTOM HOLE PRESSURE WHILE DRILLING OIL WELLS
Abstract Real time measurements and development of sensor technology are research issues associated with robustness and safety during oil well drilling operations, making feasible the diagnosis of problems and the development of a regulatory strategy. The major objective of this paper is to use an experimental plant and also field data, collected from a basi
Braz. J. Chem. Eng.. Publicado em: 2016-12
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14. Assessing the influence of the scale of operations on maintenance costs in the airline industry
AbstractThe aim of this study is to investigate whether the size of airline operations has any statistically significant effect on the costs of its aircraft maintenance. By investigating the impact of the extent of operations on unit costs of carriers, it was inspected the existence of economies of scale in providing maintenance services. Through an economet
J. Transp. Lit.. Publicado em: 2016-09
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15. Evidences of the influence of the detonation sequence in rock fragmentation by blasting – Part I
Drilling and blasting are fundamental operations in the mining cycle and consti tute an important component of the mining costs. Rock fragmentation can in principle be managed by means of two options: by increasing or reducing the specific consumption of explosives, or by modifying the drilling pattern. The choice of one or other type of control depends on t
Rem: Rev. Esc. Minas. Publicado em: 2015-09
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16. Um estudo de marcas adversativas do português à luz de uma abordagem lexicográfica bilíngue diferencial (português-francês e português-inglês): o caso de mas, porém, contudo, todavia e entretanto / A study of Portuguese adversative markers under a differential bilingual lexicographic approach (Portuguese-French and Portuguese-English): the case of mas, porém, contudo, todavia and entretanto
Given the lack of definition and contextualization of grammatical items in bilingual dictionaries, we decided to carry out a research that tried to fill these gaps in the microstructure of Portuguese-French (BP-FR) and Portuguese-English (BP-ENG) bilingual dictionaries. The study aimed at providing a support tool for students, language researchers, teachers
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/03/2012
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17. Aplicação do método da minimização da energia de Gibbs no cálculo de equilíbrio químico e de fases em sistemas eletrolíticos / Application method of the Gibbs energy minimization to calculation of phase and chemical equilibrium in electrolyte systems
In several industrial applications are used mixtures containing different solutes, often these solutes are non-volatile, such as electrolytes. The phase and chemical equilibrium in these processes occur in the various unit operations. The stages of production, as well as the separation and purification steps are critical to product quality. Thus, the calcula
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 14/12/2011
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18. PELLETIZING AND REDUCING OF MAGNETITE CONCENTRATE / PELOTIZAÇÃO E REDUÇÃO DE CONCENTRADO MAGNETÍTICO
The global increasing trend of producing iron ore fines (sinter feed and pellet feed) has also increased the importance of the agglomeration processes, in particular the pelletizing, which has as main characteristic to produce high quality pellets with excellent mechanical resistance, besides being a less polluting process than the sintering. Currently, Braz
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 14/04/2011
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19. Banco de sementes e sistemas de renovação no pasto de capim-braquiária com integração de culturas agrícolas / Seed bank in renewal of pasture signal grass with crop livestock integration
The experiment was conducted to evaluate the renewal of pasture of Brachiaria decumbens with integration of crops in cropping systems "planting" direct and conventional. The experiment was conducted in pastures of Brachiaria decumbens Stapf. Located on the campus of University Federal of Viçosa, Viçosa, MG. The experiment consisted of five "systems" of gra
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 22/02/2011
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20. Microbial production of biovanillin
This review aims at providing an overview on the microbial production of vanillin, a new alternative method for the production of this important flavor of the food industry, which has the potential to become economically competitive in the next future. After a brief description of the applications of vanillin in different industrial sectors and of its physic
Brazilian Journal of Microbiology. Publicado em: 2010-10
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21. Removal of helminth eggs in sewage side, through rapid sand filters, anthracite coal and zeolite for agricultural reuse and urban non-potable. / Remoção de ovos de helmintos de esgotos secundários, por meio de filtros rápidos de areia, carvão antracitoso e zeólito para reúso agrícola e urbano não potável.
Helminth eggs are one of the major problems regarding the reuse of treated sewage in agriculture and non-potable urban irrigation since both workers who handle the effluent and the consumer population might become contaminated. Helminth eggs are not efficiently removed by conventional unit operations and processes, which do not allow the removal of helminth
Publicado em: 2010
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22. Viabilidade técnica de uma rota não convencional para a produção de leite de cabra em pó em cooperativas do Rio Grande do Norte
Nowadays, Brazil has both the greatest goat herd and the greatest goat milk production of South America. The state of Rio Grande do Norte, located in northeast of Brazil, has an average year production of three thousand cubic meters of goat milk in natura. Part of this milk production is homemade and it comes from small farms, which unite in rural cooperativ
Publicado em: 2010
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23. DOF (Departamento de Operações de Fronteira): um estudo de integração de polícias civil e militar
This doctoral thesis aims to verify the possibility of an integrated work between civil and military police forces under a joint command and within the same police unit. It is based on the assumption that the tussle involving both law enforcement agencies has been gradually built up in the inner structures of the Brazilians security state, culminating in a s
Publicado em: 2009
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24. Estudo do acoplamento spin-órbita de multipartículas confinadas em pontos quânticos semicondutores
Spin-orbit (SO) coupling provides a way for orbital degrees of freedom to influence spin states. As a result the spin dynamics is affected, thus making spin qubit (quantum version of bit, basic unit of information in the computational language) operations more complex. Furthermore, spin-orbit coupling leads to spin decoherence and relaxation due to phonons,
Publicado em: 2009