Submitted by Kelson Anthony de Menezes (kelson@ucb.br) on 2016-12-20T12:51:42Z No. of bitstreams: 1 RobertoGoncalvesTeixeiraDissertacao2016.pdf: 5505332 bytes, checksum: 0fb6d806817df154aad3c8c588fa8087 (MD5) / Made available in DSpace on 2016-12-20T12:51:42Z (GMT). No. of bitstreams: 1 RobertoGoncalvesTeixeiraDissertacao2016.pdf: 5505332 bytes, checksum: 0fb6d806817df154aad3c8c588fa8087 (MD5) Previous issue date: 2016-03-04 / The main objective of this thesis is to analyze the critical success factors of knowledge transfer in an IT outsourcing relationship of a public organization, and how they affect the effectivity of the services provided by the organization. In the construction of this understanding, a literature review was realized, about knowledge management, knowledge transfer, knowledge sharing, IT outsourcing, and public sector, and the relation between this terms. A quantitative approach was adopted as strategy of research, aimming to evaluate the influencing factors to knowledge transfer and categories identified in literature. A documental research was proceeded in the public organization to identify the approach given to knowledge transfer in the studied context. The results indicate that the public organization lacks an embracing knowledge transfer process to IT outsourcing. Among the findings, a categorized list of critical success factors that influence the knowledge transfer, including ones suggested by the results, and the identification of opportunities resulting of knowledge transfer in IT outsourcing in an public organization. / O trabalho tem como objetivo identificar os fatores cr??ticos de sucesso (FCS) da transfer??ncia de conhecimento em uma empresa p??blica brasileira que realiza terceiriza????o de TI, verificar a relev??ncia dos FCS indicados na literatura e prover oportunidades decorrentes dos resultados encontrados. Na constru????o desse entendimento, realizou-se avalia????o da produ????o cient??fica sobre transfer??ncia de conhecimento, terceiriza????o de TI no setor p??blico, FCS e a rela????o entre esses temas. Como estrat??gia de pesquisa, adotou-se a abordagem quantitativa, buscando avaliar os fatores de influ??ncia ?? transfer??ncia de conhecimento e categorias identificadas na literatura. Foi realizada pesquisa documental na empresa p??blica, e identificada a abordagem quanto ?? transfer??ncia de conhecimentos no contexto estudado. Os resultados da pesquisa indicam que a empresa p??blica federal carece de um processo abrangente de transfer??ncia de conhecimentos para contrata????o de TI. Dentre os achados, destaca-se uma lista categorizada de FCS que influenciam a transfer??ncia de conhecimentos, incluindo fatores cr??ticos sugeridos pela pesquisa, e a identifica????o de oportunidades decorrentes da transfer??ncia de conhecimentos na presta????o de servi??os terceirizados de TI na empresa p??blica.

Made available in DSpace on 2014-12-17T15:46:17Z (GMT). No. of bitstreams: 1 AnaPQS.pdf: 581122 bytes, checksum: 6dd9326e4207f5ba412264dc753c49e3 (MD5) Previous issue date: 2008-04-30 / The Family Scolarship Program while public politics of intersectorial form developed by Social Development Department and Famine Combat having with partner the Education Department and Health Department inaugurate in the country a new integrity way of the public politics, reinforcing a precept of 2004 Social Protection National Politics (PNAS 2004) that places the social protection while allied to the social and human development. The research INCOME TRANSFER AND LOCAL DEVELOPMENT: the family scolarship program in Pedra Grande-RN municipally had as aim to avaluate the permanent Family Scolarship Program as a possible element in local development of Pedra Grande-RN municipally understood as capacity expansion and improvement of life quality from its users. For this means we elaborate specifically the families` socio-economical profile; we avaluate the program repercussion in these families` lives; we analyse in which proportion occurred the capacity expansion and improvement of life quality of the users. The methodologic process was constituted by: literarture review about Income Transfer, Social Vulnerability, Development and Public Politics Avaluation to the criation of a theoric picture analysis. The documental research joined to the Social Development Department and Famine Combat of Pedra Grande Municipally Hall to obtain of the aims, program goals, and the profile of users. And finally, carrying out the interviews with the managers and experts of the Municipally Program and focal groups with the users to avaluate the permanent of the Program starting by the points of view of those ones. It was verified that the program expand the capacity (food, consumer goods and services, bank services access and wages) and improvement in life quality of the users. Nevertheless, there are deficiencies in coming with conditionality and from the use of resources the by families users / O Programa Bolsa Fam?lia enquanto pol?tica p?blica de modalidade intersetorial, desenvolvida pelo Minist?rio do Desenvolvimento Social e Combate ? Fome, em parceria com o Minist?rio da Educa??o e o Minist?rio da Sa?de inaugura no pa?s um novo formato de integralidade da pol?tica p?blica, refor?ando um preceito da Pol?tica Nacional de Assist?ncia Social de 2004 (PNAS 2004) que coloca a assist?ncia social enquanto aliada do desenvolvimento social e humano. A pesquisa TRANFER?NCIA DE RENDA E DESENVOLVIMENTO LOCAL: o programa bolsa fam?lia no munic?pio de Pedra Grande-RN teve por objetivo Avaliar a efetividade do Programa Bolsa Fam?lia como um poss?vel elemento do desenvolvimento local no Munic?pio de Pedra Grande-RN, entendido como expans?o das capacidades e melhoria da qualidade de vida dos benefici?rios. Para tanto, especificamente, elaboramos o perfil s?cio-econ?mico das fam?lias; avaliamos as repercuss?es do programa na vida dessas fam?lias; analisamos em que propor??o ocorreu a expans?o das capacidades e melhoria da qualidade de vida dos benefici?rios. O processo metodol?gico constituiu-se de: revis?o de literatura sobre Transfer?ncia de Renda, Vulnerabilidade Social, Desenvolvimento e Avalia??o de Pol?ticas P?blicas para constru??o de um quadro te?rico de an?lise. Pesquisa documental junto ao Minist?rio do Desenvolvimento Social e Combate ? Fome na Prefeitura Municipal de Pedra Grande para obten??o dos objetivos, metas do programa, e o perfil dos benefici?rios. E finalmente realiza??o de Entrevistas com os gestores e t?cnicos do Programa no Munic?pio e grupos focais com os benefici?rios para avaliar a efetividade do Programa a partir da ?tica destes. Verificou-se que o programa expande as capacidades (alimenta??o, consumo de bens e servi?os, acesso aos servi?os banc?rios e remunera??o) e melhora a qualidade de vida dos beneficiados. No entanto existem defici?ncias na gest?o, no acompanhamento das condicionalidades e do uso dos recursos pelas fam?lias beneficiadas

Made available in DSpace on 2014-12-17T15:47:45Z (GMT). No. of bitstreams: 1 DemostenesSS.pdf: 468027 bytes, checksum: 7ef30fc93402336c75356410113f8a56 (MD5) Previous issue date: 2006-05-19 / Programs manipulate information. However, information is abstract in nature and needs to be represented, usually by data structures, making it possible to be manipulated. This work presents the AGraphs, a representation and exchange format of the data that uses typed directed graphs with a simulation of hyperedges and hierarchical graphs. Associated to the AGraphs format there is a manipulation library with a simple programming interface, tailored to the language being represented. The AGraphs format in ad-hoc manner was used as representation format in tools developed at UFRN, and, to make it more usable in other tools, an accurate description and the development of support tools was necessary. These accurate description and tools have been developed and are described in this work. This work compares the AGraphs format with other representation and exchange formats (e.g ATerms, GDL, GraphML, GraX, GXL and XML). The main objective this comparison is to capture important characteristics and where the AGraphs concepts can still evolve / Programas manipulam informa??es. Entretanto, as informa??es s?o essencialmente abstratas e precisam ser representadas, normalmente por estruturas de dados, permitindo a sua manipula??o. Esse trabalho apresenta os AGraphs, um formato de representa??o e transfer?ncia de dados que usa grafos direcionados tipados que permitem a simula??o de hiperarestas e de grafos hier?rquicos. Associado ao formato AGraphs existe uma biblioteca de manipula??o com uma interface simples de ser usada, mas dependente da linguagem. O formato AGraphs foi usado de maneira ad-hoc como formato de representa??o em algumas ferramentas desenvolvidas na UFRN, e, com a possibilidade de uso em outras aplica??es, tornou-se necess?ria uma defini??o precisa e o desenvolvimento de ferramentas de suporte. A defini??o precisa e as ferramentas foram desenvolvidas e s?o descritas neste trabalho. Finalizando, compara??es do formato AGraphs com outros formatos de representa??o e transfer?ncia de dados (ATerms, GDL, GraphML, GraX, GXL e XML) s?o realizadas. O principal objetivo destas compara??es ? obter as caracter?sticas significantes e em que conceitos o formato e a biblioteca AGraphs deve amadurecer

Made available in DSpace on 2014-12-17T14:34:45Z (GMT). No. of bitstreams: 1 JoseANS_DISSERT.pdf: 1156572 bytes, checksum: 4666965366a1ddf89a4160f89ef286c0 (MD5) Previous issue date: 2012-11-19 / This study aims to analyze the main effect of social programs and cash transfers on the labor supply of non-farm family members in poverty in rural areas of the Northeast. Among the specific objectives, we sought to investigate the effects of these programs and individual characteristics on the decision of participation and allocation of working hours of parents and children in non-agricultural activities. It was assumed, as a theoretical basis, the model of neoclassical labor supply as well as the principle that the decision of allocation of working hours, non-agricultural, is subject to the initial choice of the worker devote or not the non-agricultural employment . The hypothesis assumes that access to social programs and income transfer contributes to the dismay of rural workers, in poverty, in its decision to participate and offer hours of work in non-agricultural activities. To achieve this objective, we applied the models of Heckman (1979) and Double Hurdle, of Cragg (1971), consisting of associating the decision to participate in the labor market with the decision on the amount of hours allocated. The database used was the National Survey by Household Sampling (PNAD) of 2006. The results of the heads of households showed that transfers of income, although they may have some effect on labor supply rural nonfarm, the magnitude has to say that there may be some dependence on benefits. The estimates for the joint children of 10 to 15 years showed that the programs have negatively influenced participation in suggesting an increase in school participation, although for the allocation of working hours the results were not significant on the incidence of child labor / Este estudo tem como objetivo principal analisar o efeito dos programas sociais e de transfer?ncia de renda sobre a oferta de trabalho n?o agr?cola de membros das fam?lias em condi??o de pobreza no meio rural da regi?o Nordeste. Entre os objetivos espec?ficos, procurou-se investigar os efeitos desses programas e das caracter?sticas individuais sobre a decis?o de participa??o e de aloca??o de horas de trabalho de pais e de filhos em atividades n?o agr?colas. Admitiu-se, como base te?rica, o modelo de oferta de trabalho neocl?ssico, bem como o princ?pio de que a decis?o de aloca??o de horas de trabalho n?o agr?cola est? condicionada ? escolha inicial do trabalhador em se dedicar ou n?o ao emprego n?o agr?cola. A hip?tese testada pressup?e que o acesso aos programas sociais e de transfer?ncia de renda contribuem para o desalento do trabalhador rural, em condi??o de pobreza, na sua decis?o de participar e ofertar horas de trabalho nas atividades n?o agr?colas. Para alcan?ar esse objetivo, aplicaram-se os modelos de Heckman (1979) e de Double Hurdle, de Cragg (1971), que consistem em associar a decis?o de participa??o no mercado de trabalho com a decis?o da quantidade de horas de trabalho alocadas. A base de dados utilizada foi a da Pesquisa Nacional por Amostragem de Domicilio (PNAD), do ano de 2006. Os resultados dos chefes dos domic?lios mostraram que as transfer?ncias de renda, embora possam ter algum efeito sobre a oferta de trabalho rural n?o agr?cola, n?o t?m magnitude suficiente para que se afirme que possa haver alguma depend?ncia em rela??o aos benef?cios. As estima??es conjuntas para os filhos de 10 a 15 anos mostraram que os programas t?m influenciado negativamente na participa??o, sugerindo um aumento na participa??o escolar, embora, para a aloca??o de horas de trabalho, os resultados n?o tenham sido significantes sobre a incid?ncia de trabalho infantil

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2015-10-14T20:45:55Z No. of bitstreams: 1 BrunoNunesMeloDaSilva_DISSERT.pdf: 3354700 bytes, checksum: 03b0257506443078469f4a0082749a27 (MD5) / Approved for entry into archive by Elisangela Moura (lilaalves@gmail.com) on 2015-10-14T21:47:15Z (GMT) No. of bitstreams: 1 BrunoNunesMeloDaSilva_DISSERT.pdf: 3354700 bytes, checksum: 03b0257506443078469f4a0082749a27 (MD5) / Made available in DSpace on 2015-10-14T21:47:15Z (GMT). No. of bitstreams: 1 BrunoNunesMeloDaSilva_DISSERT.pdf: 3354700 bytes, checksum: 03b0257506443078469f4a0082749a27 (MD5) Previous issue date: 2014-05-02 / O prop?sito de solu??es h?bridas, atrav?s da aplica??o da T?cnica da Transformada Integral Generalizada (GITT), permite o desenvolvimento para o tratamento do problema de escoamento com transfer?ncia de calor transiente para fluidos newtonianos condutores el?tricos submetidos a campos magn?ticos constantes em um canal de placas planas e paralelas com ou sem rota??o do canal, matematicamente esse problema ? modelado por sistemas de equa??es diferencias acopladas. No escoamento, as influ?ncias de efeitos Hall, deslizamento de ?ons e presen?a de part?culas s?lidas no escoamento s?o consideradas. O escoamento transiente ? mantido por gradiente de press?o constante ou exponencial, em regime permanente ? considerado o movimento da placa superior bem como a advec??o pelos poros da placa. O campo magn?tico ? aplicado na dire??o normal ao escoamento. Assume-se que tal campo magn?tico ? constante e n?o ? afetado pelo escoamento, de maneira que apenas a intera??o de uma via entre o escoamento do fluido condutor el?trico e o campo magn?tico ? estudada. Admite-se, no escoamento, a varia??o das propriedades f?sicas transportadas, tais como, viscosidade, condutividade t?rmica e el?trica com a temperatura. Resultados s?o obtidos e comparados com outros resultados num?ricos para os campos de velocidade e temperatura do fluido e das part?culas s?lidas em fun??o dos par?metros governantes, a saber, n?mero de Reynolds, Hartmann, hall, deslizamento de ?ons, concentra??o das part?culas s?lidas e par?metros f?sicos. Nas solu??es num?ricas, obtidas com o uso das bibliotecas do IMSL? e Fortran utiliza-se precis?o prescrita e trunca-se, a uma ordem finita, o sistema ordin?rio transformado o qual ? resolvido numericamente com uso das sub-rotinas bem estabelecidas no IMSL?. ? realizada an?lise de converg?ncia para os principais potenciais com o objetivo de ilustrar a consist?ncia da t?cnica (GITT) e a sua utiliza??o com finalidades de benchmark nessa ?rea da din?mica dos fluidos e transfer?ncia de calor. / The present study proposes the development of hybrid solutions to the transient Hartmann flow problem with heat transfer of an electrically conducting and newtonian fluid subjected to a constant magnetic field. The Generalized Integral Transform Technique is employed to analyze the influence of Hall and ion-slip effects, as well as the presence of solid particles on flow behavior, which is maintained by a constant or exponential-decaying gradient pressure. A transverse flow normal to the walls can also occurs, so that plates can be both porous. Additionally, a movement of the upper plate in the longitudinal direction can be considered. Here, it is assumed that the magnetic field is constant, being not affected by the flow, so that only an one-way interaction between the flow and the magnetic field is studied. Temperature-dependent transport properties, such as viscosity, thermal and electrical conductivity, can be considered too. Hybrid results are obtained and compared to other numerical results for the velocity and temperature fields of flow and solid particles as function of the main dimensionless governing parameters, namely, Reynolds number, Hartmann number, Hall, Ion-slip and concentration of solid particles. Convergence analyses are carried out for the main potentials in order to illustrate the consistency of the technique (GITT) and its use for purposes of benchmarking in the area of heat and fluid flow.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-02-05T22:57:33Z No. of bitstreams: 1 RafaelaMedeirosDeSouza_DISSERT.pdf: 16368490 bytes, checksum: 32187a14cfce1f59c3e74840bc7d851a (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-02-16T21:42:19Z (GMT) No. of bitstreams: 1 RafaelaMedeirosDeSouza_DISSERT.pdf: 16368490 bytes, checksum: 32187a14cfce1f59c3e74840bc7d851a (MD5) / Made available in DSpace on 2016-02-16T21:42:19Z (GMT). No. of bitstreams: 1 RafaelaMedeirosDeSouza_DISSERT.pdf: 16368490 bytes, checksum: 32187a14cfce1f59c3e74840bc7d851a (MD5) Previous issue date: 2015-03-16 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico - CNPq / A descoberta de que uma corrente el?trica ? capaz de exercer um torque em um material ferromagn?tico, atrav?s da transfer?ncia de momento angular de spin, pode proporcionar o desenvolvimento de novos dispositivos tecnol?gicos que armazenam informa??o a partir da dire??o da magnetiza??o. A redu??o da densidade de corrente para revers?o da magnetiza??o ? primordial para potenciais aplica??es em c?lulas de mem?rias magn?ticas de acesso aleat?- rio n?o vol?teis (MRAM). Apresentamos uma investiga??o te?rica dos efeitos de forma e do campo de dipolar na densidade de corrente cr?tica para revers?o da magnetiza??o, via torque por transfer?ncia de spin (STT), em nanoelementos ferromagn?ticos. O sistema nanoestruturado consiste em uma camada de refer?ncia, na qual a corrente ser? polarizada em spin, e uma camada livre de revers?o da magnetiza??o. Observamos consider?veis varia??es na densidade de corrente cr?tica em fun??o da espessura da camada de revers?co ( ? t = 1.0 nm, 1.5 nm, 2.0 nm e 2.5 nm) e da geometria do nanoelemento (circular e el?ptico), do tipo de material que comp?e a camada livre do sistema (Ferro e Permalloy) e de acordo com a orienta??o da magnetiza??o e da polariza??o em spin com o eixo maior. Mostramos que a densidade de corrente cr?tica pode ser reduzida em cerca de 50% diminuindo a espessura da camada livre de Fe e em 75% ao modificar a magnetiza??o de satura??o de nanoelementos circulares com 2.5 nm de espessura. Observamos, ainda, uma redu??o de at? 90% na densidade de corrente de revers?o para nanoelementos ultrafinos magnetizados ao longo da dire??o do eixo menor, usando a polariza??o no plano paralela ? magnetiza??o. / The discovery that a spin-polarized current is capable of exerting a torque in a ferromagnetic material, through spin transfer, might provide the development of new technological devices that store information via the direction of magnetization. The reduction of current density to revert the magnetization is a primary issue to potential applications on non volatile random access memories (MRAM). We report a theorical study of the dipolar and shape effects on the critical current density for reversal of magnetization, via spin transfer torque (STT), on ferromagnetic nanoelements. The nanostructured system consists on a reference layer, in which the current will be spin-polarized, and a free layer of magnetization reversal. We observed considerable changes on the critical current density as a function of the element?s reversion layer thickness (t = 1.0 nm, 1.5 nm, 2.0 nm e 2.5 nm) and geometry (circular and elliptical), the material kind of the system free layer (Iron and Permalloy) and according to the orientation of the magnetization and the spin polarization with the major axis. We show that the critical current density may be reduced about 50% by reducing the Fe free layer thickness and around 75% when we change the saturation magnetization of circular nanoelements with 2.5 nm of thickness. We still observed a reduction as much as 90% on the current density of reversion for thin nanoelements magnetized along the minor axis direction, using in-plane spin polarization parallel to the magnetization.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-04-26T19:29:13Z No. of bitstreams: 1 DiogoRosemberghDaSilvaNobrega_DISSERT.pdf: 3407619 bytes, checksum: a00b7d07c5d402e8c57a1d3b73198713 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-04-28T23:50:33Z (GMT) No. of bitstreams: 1 DiogoRosemberghDaSilvaNobrega_DISSERT.pdf: 3407619 bytes, checksum: a00b7d07c5d402e8c57a1d3b73198713 (MD5) / Made available in DSpace on 2016-04-28T23:50:33Z (GMT). No. of bitstreams: 1 DiogoRosemberghDaSilvaNobrega_DISSERT.pdf: 3407619 bytes, checksum: a00b7d07c5d402e8c57a1d3b73198713 (MD5) Previous issue date: 2015-03-05 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / Na ind?stria do petr?leo, a ?gua produzida ? o maior volume l?quido produzido com grande capacidade poluidora. Dentre os contaminantes org?nicos, os arom?ticos apresentam o principal risco ao meio ambiente e ? sa?de da popula??o principalmente BTEX. Ao longo dos ?ltimos anos, a eletroqu?mica tem se mostrado eficiente na degrada??o desses compostos, envolvendo apenas a utiliza??o de el?trons como reagentes. Entretanto, o desenho do reator eletroqu?mico, hidrodin?mica e, consequentemente, o coeficiente de transfer?ncia de massa s?o par?metros determinantes na efici?ncia do processo eletroqu?mico. Dentro desse contexto, o objetivo deste trabalho foi investigar geometrias de c?lulas eletroqu?micas, visando determinar os coeficientes de transfer?ncia de massa e entender a sua hidrodin?mica. Foram estudadas c?lulas em batelada e em fluxo, variando a pot?ncia da agita??o, posi??o da agita??o e espa?amento entre os eletrodos, empregando a t?cnica de corrente limite, com um gradiente de concentra??o de 4 a 24 mmol/dm? de K4[Fe(CN)]6 em propor??o molar de 2:1 para K3[Fe(CN)]6 em meio de NaOH 0,5 mol/dm?, a fim de determinar a corrente limite, e consequentemente o coeficiente de transfer?ncia de massa (km). Os resultados obtidos mostraram claramente que na c?lula em batelada, o aumento da agita??o e a posi??o da agita??o influenciaram o km; na c?lula em fluxo, o afastamento dos eletrodos n?o mostra influencia significativa quando a agita??o (fluxo) ? direcionada ? superf?cie do eletrodo; e ainda, as c?lulas em fluxo se mostraram mais eficientes no que diz respeito ? elimina??o de resist?ncias f?sicas inerentes ao tratamento eletro-oxidativo. Por fim, os resultados alcan?ados mostraram que ? poss?vel a aplica??o do reator eletroqu?mico no tratamento de BTX, uma vez que foi identificada uma geometria com o melhor coeficiente de massa, favorecendo a oxida??o das esp?cies na superf?cie do eletrodo, de forma mais r?pida e eficiente. / The oil and gas production processes generate large volumes of waste with high toxicity. In this industry, produced water is the most produced liquid volume with great polluting capacity. Among the organic contaminants, the aromatics, mainly BTEX, present a major risk to the environment and people's health. Over the past years, many studies have been conducted under the electrooxidation of aromatic compounds, showing that the electrochemical degradation is efficient for these substances, even more importantly, the process involves only the use of electrons as reactants. However, the design of the electrochemical reactor, hydrodynamics and mass transfer coefficients are critical parameters on the efficiency of the electrochemical process. In this context, the objective of this study was to investigate geometries of electrochemical cells, to determine the mass transfer coefficients and understand their hydrodynamics. Cells were studied in batch and flow design, varying stirring rate, the stirring position and spacing between electrodes. In order to determine the current limit, and thus the mass transfer coefficient (Km), it was used a concentration gradient of K4[FeCN]6 / K3[FeCN]6 (2:1) from 4 to 24 mM, in medium of 0.5 M NaOH. The results clearly showed that regarding the batch cell, increasing stirring rate and changing its position promote a considerable effect on Km; in the flow cell, no influences were achieved when the spacing of the electrodes was modified when the stirring (flow) is directed to the electrode surface; and, the flow cells are more efficient with regard to the elimination of inherent physical resistance to the electrochemical treatment. Finally, the results showed that the application of reactor is possible to treat electrochemically BTX because the better geometry has been identified, favoring the oxidation of the species on the electrode surface more rapidly and efficiently.

Made available in DSpace on 2014-12-17T14:58:05Z (GMT). No. of bitstreams: 1 DabneySGM_DISSERT.pdf: 1770376 bytes, checksum: 5e5a6ea101ce8878066e0256504f801a (MD5) Previous issue date: 2011-03-31 / In the industry of ceramic in Rio G. do Norte, tile stands out as the most manufactured product by this industry, being the intermittent kiln ab?bada and caieira the principal type of kiln used in burning. There was a need to make a study of the influence exerted by the type of kiln in which tiles are burnt in their thermo physical properties. The analysis started with 24 raw samples of tile, which was split in two groups of 12 samples and burnt in Ab?bada and Caieira kiln. Besides that, it was made study of the tax of heat transfer to the environment (for each kiln). After having been burnt the samples were taken for laboratory analysis. The properties verified were impermeability, determination of dry mass, absorption of water, the load of bending rupture and its geometric characteristics, the tests were conducted following the currents standards. The tests were carried out according to the ABNT - NBR 15310. The calculation of the rate of heat transfer showed that the ab?bada kiln is more efficient than the Caieira, however the results of tests on the samples revealed no superiority of one over another sample. So the furnace had no influence on the performance of the ceramic tiles / Na ind?stria de cer?mica vermelha a telha desponta como o produto mais fabricado pela ind?stria de cer?mica do Serid?/RN, sendo os fornos intermitentes do tipo ab?bada e caieira os mais utilizados para a queima destas telhas. Verificou-se a necessidade de se fazer um estudo da influ?ncia exercida pelo tipo de forno no qual as telhas s?o queimadas nas suas propriedades termof?sicas, mec?nicas e geom?tricas. Sendo selecionadas 24 amostras de um mesmo processo de fabrica??o, no entanto estas foram posteriormente separadas em dois lotes de 12 unidades e levadas a queima no forno caieira e ab?bada. ? importante ressaltar que os corpos de prova n?o fazem parte do processo produtivo das cer?micas de onde foram utilizados os fornos para queima, ou seja, as cer?micas gentilmente cederam seus fornos para a realiza??o do experimento. Foi realizado um estudo da taxa de transfer?ncia de calor ao meio ambiente para cada tipo de forno. Assim as amostras ap?s serem queimadas foram levadas para an?lise em laborat?rio. As propriedades verificadas foram ? impermeabilidade, determina??o da massa seca e da absor??o da ?gua, determina??o da carga de ruptura ? flex?o e de suas caracter?sticas geom?tricas. Os ensaios foram realizados segundo a norma ABNT - NBR 15310. O calculo da taxa de transfer?ncia de calor mostrou que o forno ab?bada ? mais eficiente que o caieira, no entanto os resultados dos ensaios nas amostras mostraram que n?o houve superioridade de uma amostra sobre outra, assim os fornos n?o tiveram influ?ncia no desempenho das telhas

Made available in DSpace on 2014-12-17T15:01:56Z (GMT). No. of bitstreams: 1 LuizFSF_TESE.pdf: 2382677 bytes, checksum: 16f0fd92d4efa3b045a66f19b62ab2ea (MD5) Previous issue date: 2013-09-09 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / Natural gas, although basically composed by light hydrocarbons, also presents contaminant gases in its composition, such as CO2 (carbon dioxide) and H2S (hydrogen sulfide). The H2S, which commonly occurs in oil and gas exploration and production activities, causes damages in oil and natural gas pipelines. Consequently, the removal of hydrogen sulfide gas will result in an important reduction in operating costs. Also, it is essential to consider the better quality of the oil to be processed in the refinery, thus resulting in benefits in economic, environmental and social areas. All this facts demonstrate the need for the development and improvement in hydrogen sulfide scavengers. Currently, the oil industry uses several processes for hydrogen sulfide removal from natural gas. However, these processes produce amine derivatives which can cause damage in distillation towers, can cause clogging of pipelines by formation of insoluble precipitates, and also produce residues with great environmental impact. Therefore, it is of great importance the obtaining of a stable system, in inorganic or organic reaction media, able to remove hydrogen sulfide without formation of by-products that can affect the quality and cost of natural gas processing, transport, and distribution steps. Seeking the study, evaluation and modeling of mass transfer and kinetics of hydrogen removal, in this study it was used an absorption column packed with Raschig rings, where the natural gas, with H2S as contaminant, passed through an aqueous solution of inorganic compounds as stagnant liquid, being this contaminant gas absorbed by the liquid phase. This absorption column was coupled with a H2S detection system, with interface with a computer. The data and the model equations were solved by the least squares method, modified by Levemberg-Marquardt. In this study, in addition to the water, it were used the following solutions: sodium hydroxide, potassium permanganate, ferric chloride, copper sulfate, zinc chloride, potassium chromate, and manganese sulfate, all at low concentrations (?10 ppm). These solutions were used looking for the evaluation of the interference between absorption physical and chemical parameters, or even to get a better mass transfer coefficient, as in mixing reactors and absorption columns operating in counterflow. In this context, the evaluation of H2S removal arises as a valuable procedure for the treatment of natural gas and destination of process by-products. The study of the obtained absorption curves makes possible to determine the mass transfer predominant stage in the involved processes, the mass transfer volumetric coefficients, and the equilibrium concentrations. It was also performed a kinetic study. The obtained results showed that the H2S removal kinetics is greater for NaOH. Considering that the study was performed at low concentrations of chemical reagents, it was possible to check the effect of secondary reactions in the other chemicals, especially in the case of KMnO4, which shows that your by-product, MnO2, acts in H2S absorption process. In addition, CuSO4 and FeCl3 also demonstrated to have good efficiency in H2S removal / O g?s natural, embora seja composto basicamente de hidrocarbonetos leves, apresenta tamb?m em sua composi??o gases contaminantes como o CO2 (Di?xido de carbono) e o H2S (Sulfeto de hidrog?nio). O H2S, que comumente ocorre nas atividades de explora??o e produ??o de ?leo e g?s, danifica as tubula??es de transporte do petr?leo e do pr?prio g?s natural. Por isso, a elimina??o do sulfeto de hidrog?nio levar? a significativa redu??o dos custos de opera??o e a uma melhor qualidade do ?leo destinado as refinarias, resultando assim num beneficio econ?mico, ambiental e social. Tudo isso demonstra a necessidade de desenvolvimento e aprimoramento de sequestrantes que removam o sulfeto de hidrog?nio da ind?stria de petr?leo. Atualmente existem v?rios processos para o tratamento do g?s natural, utilizados pela ind?stria petrol?fera para remo??o do H2S, no entanto, eles produzem derivados de aminas que danificam as torres de destila??o, formando precipitados insol?veis que provocam entupimento dos dutos e originam res?duos de grande impacto ambiental. Por isso, a obten??o de um sistema est?vel em meio reacional inorg?nico ou org?nico capaz de remover o sulfeto de hidrog?nio sem formar subprodutos que afetem a qualidade e o custo do processamento, transporte e distribui??o do g?s natural ? de grande import?ncia. Para estudar, avaliar e modelar a transfer?ncia de massa e a cin?tica da remo??o do sulfeto de hidrog?nio (H2S) montou-se uma coluna de absor??o contendo an?is de raschig, por onde o g?s natural contaminado com H2S atravessava uma solu??o aquosa de compostos inorg?nicos estagnada, sendo por esta absorvida. A essa coluna foi acoplado a um sistema de detec??o de H2S com interface com o computador. Os dados e Equa??es do modelo foram resolvidos pelo m?todo de m?nimos quadrados modificado de Levemberg-Marquardt. Neste estudo al?m da ?gua foram utilizadas as solu??es de hidr?xido de s?dio, permanganato de pot?ssio, sulfato de cobre, cloreto f?rrico, cloreto de zinco, cromato de pot?ssio, sulfato de mangan?s, a baixas concentra??es, na ordem de 10 ppm, com o objetivo ? avaliar a interfer?ncia entre par?metros f?sicos e qu?micos da absor??o, ou mesmo buscar um melhor coeficiente de transfer?ncia de massa como ? o caso dos reatores de mistura e colunas de absor??o operando em contra corrente. Nesse contexto a avalia??o da remo??o do H2S surge como um procedimento valioso para o tratamento do g?s natural e destino dos subprodutos do processo. Os estudos das curvas de absor??o obtidos permitiram determinar a etapa controladora da transfer?ncia de massa dos processos envolvidos, os coeficientes volum?tricos de transfer?ncia de massa e as concentra??es de equil?brio, assim como, efetuar um estudo cin?tico. Os resultados mostraram que a cin?tica de remo??o do H2S ? maior para o NaOH, mas como o estudo foi realizado em baixas concentra??es de reagente pode-se verificar o efeito das rea??es secund?rias nos outros reagentes, principalmente no caso do KMnO4, que mostra seu sub produto, MnO2, tamb?m atua na absor??o do H2S. O CuSO4 e o FeCl3 tamb?m apresentaram boa efici?ncia de remo??o

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2017-01-13T13:32:04Z No. of bitstreams: 1 KalianeBarbosaDaSilva_DISSERT.pdf: 1763953 bytes, checksum: 14079a5f235d5416f5e8036f655a9c6f (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2017-01-24T13:37:49Z (GMT) No. of bitstreams: 1 KalianeBarbosaDaSilva_DISSERT.pdf: 1763953 bytes, checksum: 14079a5f235d5416f5e8036f655a9c6f (MD5) / Made available in DSpace on 2017-01-24T13:37:49Z (GMT). No. of bitstreams: 1 KalianeBarbosaDaSilva_DISSERT.pdf: 1763953 bytes, checksum: 14079a5f235d5416f5e8036f655a9c6f (MD5) Previous issue date: 2016-06-16 / O objetivo deste estudo piloto consistiu em verificar se o Programa Bolsa Fam?lia (PBF) promoveu algum impacto positivo efetivo sobre a Seguran?a Alimentar de benefici?rios no munic?pio de Natal. Al?m de revisitar a literatura sobre a forma??o dos sistemas de prote??o social no mundo e no Brasil, o trabalho realizou uma avalia??o quantitativa e qualitativa para obter dados prim?rios, onde participaram 106 titulares do programa. A triagem dos adultos que compuseram a amostra foi realizada no Cadastro ?nico no munic?pio de Natal, situado no Bairro do Igap?, na Regi?o Administrativa Norte. Para caracterizar a situa??o socioecon?mica e demogr?fica, avaliar o n?vel de Seguran?a Alimentar e analisar a percep??o dos usu?rios, elaborou-se um question?rio de perguntas abertas e fechadas baseado na Escala Brasileira de Inseguran?a Alimentar (EBIA). Os resultados conforme apresentados no cap?tulo cinco, comprovaram que houve sim uma melhoria na condi??o alimentar das fam?lias atendidas, mas um avan?o apenas discreto, pois 99% dos entrevistados foram classificados em Inseguran?a Alimentar. Espera-se que este estudo piloto possa contribuir para o fortalecimento da compreens?o e do combate ? Inseguran?a Alimentar no munic?pio de Natal. / The objective of this pilot study is to verify that the Bolsa Fam?lia program (the Bolsa Familia program is a direct transfer program income that benefits families in poverty and extreme poverty in Brazil) has promoted some impact on the food security of beneficiaries in Natal. In addition to revisiting the literature on the formation of social protection systems in the world and in Brazil, the work carried out a quantitative and qualitative evaluation for primary data, attended by 105 adults program holders. The screening of adults in the sample was made in the Unified Register in Natal, located in Igap? Neighborhood, Administrative Region North. To characterize the socioeconomic and demographic situation, assess the level of food safety and analyze the perception of users, we prepared a questionnaire of open and closed questions based on the Brazilian Food Insecurity Scale. The results did not confirm improvement in the food condition of the families, since 99 % of respondents were further classified in Food Insecurity It is hoped that this pilot study will contribute to strengthening understanding and combating Food Insecurity in Natal.