Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-02-22T21:55:16Z No. of bitstreams: 1 GilbertoAntonioGorrichateguiVasquez_DISSERT.pdf: 1855159 bytes, checksum: 51bfff3bef02d3a29365a91ca8f80a45 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-02-24T00:34:39Z (GMT) No. of bitstreams: 1 GilbertoAntonioGorrichateguiVasquez_DISSERT.pdf: 1855159 bytes, checksum: 51bfff3bef02d3a29365a91ca8f80a45 (MD5) / Made available in DSpace on 2016-02-24T00:34:39Z (GMT). No. of bitstreams: 1 GilbertoAntonioGorrichateguiVasquez_DISSERT.pdf: 1855159 bytes, checksum: 51bfff3bef02d3a29365a91ca8f80a45 (MD5) Previous issue date: 2005-07-06 / A qualidade final das obras realizadas pela ind?stria da constru??o civil depende diretamente da qualidade dos materiais fornecidos e utilizados durante todas as fases de execu??o das mesmas. A participa??o do Governo Federal e diversos programas em n?vel estadual t?m estabelecido condi??es para estimular e exigir a eleva??o do n?vel de qualidade na cadeia produtiva da ind?stria da constru??o civil. Estes programas visam a conformidade dos produtos ?s normas t?cnicas. Dentro deste contexto, o programa de avalia??o da conformidade de produtos cer?micos do RN, est? avaliando o grau de conformidade ?s normas t?cnicas brasileiras dos blocos e telhas cer?micas produzidos no p?lo cer?mico do estado. Neste trabalho ? determinado o grau de conformidade e n?o-conformidade de blocos cer?micos de veda??o produzidos por algumas empresas em diferentes regi?es do RN, tais como: Ass?, S?o Gon?alo do Amarante, Apodi, Parelhas, S?o Jos? do Mipibu e Maca?ba. Utilizando-se as normas t?cnicas como refer?ncia, se procuraram reproduzir em laborat?rio, os procedimentos experimentais para a realiza??o dos ensaios, tal como estipulado nelas. Foi poss?vel determinar que nenhuma das amostras das empresas avaliadas est? plenamente conforme com as normas t?cnicas vigentes, o que reflete a condi??o imperante no mercado. / The final quality of the works accomplished by the building construction industry depends directly on the quality of the materials supplied and used during all their phases of execution. The federal government participation and several state programs have established conditions to stimulate and require the increment of the quality level in the building construction industry?s product chain. These programs aim at the product conformity to the technical standards. Within this context, the evaluation program of the ceramic product conformity in Rio Grande do Norte state is assessing the conformity degree to Brazilian Technical Standards of ceramic bricks and tiles made in the ceramic production area in the state. In this work, is determine the degree of conformity of the sealing ceramic bricks made by some companies in different areas of the state, such as Ass?, S?o Gon?alo do Amarante, Apodi, Parelhas, S?o Jos? do Mipibu e Maca?ba. Using the technical standards as a point of reference, we attempted to reproduce in the laboratory the experimental procedures to the analysis execution, according to the specifications. It was possible to determine that none of the evaluated samples are in strict conformity with the current technical standards, what reflects the real situation of the products available on the market.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-03-09T23:31:46Z No. of bitstreams: 1 PaulaLucianaRodriguesDeSousa_DISSERT.pdf: 2557678 bytes, checksum: b17272c05603870909374f65a8b179a8 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-03-12T00:09:54Z (GMT) No. of bitstreams: 1 PaulaLucianaRodriguesDeSousa_DISSERT.pdf: 2557678 bytes, checksum: b17272c05603870909374f65a8b179a8 (MD5) / Made available in DSpace on 2016-03-12T00:09:54Z (GMT). No. of bitstreams: 1 PaulaLucianaRodriguesDeSousa_DISSERT.pdf: 2557678 bytes, checksum: b17272c05603870909374f65a8b179a8 (MD5) Previous issue date: 2015-02-02 / Durante o processo de refino do petr?leo tem-se como descarte um grande volume de ?gua, a qual carrega os contaminantes provenientes do processo. Uma classe de compostos contaminantes, decorrente da ind?stria petroqu?mica, s?o os hidrocarbonetos poliarom?ticos (HPA?s). Visando avaliar a biodegrada??o do Dibenzotiofeno presente na ?gua de refinaria preparou-se um efluente sint?tico para ser tratado utilizando lodos ativados. Para isso, realizou-se um planejamento composto central 2? com triplicata no ponto central e 6 pontos axiais tendo como vari?veis independentes (fatores) a concentra??o inicial de DBT, o pH e o tempo de biodegrada??o. A presen?a do DBT, e de seu derivado 2-HBF, no efluente final tratado pelo sistema de lodos ativados foi monitorada efetuando-se uma extra??o l?quido - l?quido com posterior an?lise em CLAE/UV utilizando-se uma metodologia otimizada no presente estudo. A biodegrada??o do DBT foi verificada monitorando-se os par?metros DQO, pH, temperatura, SST, SSV, VFL, IVL. Quanto ? adequa??o das an?lises cromatogr?ficas, os resultados indicaram que a metodologia avaliada pode ser utilizada no acompanhamento da degrada??o de DBT e 2-HBF por lodos ativados, visto que foram obtidos ?timos valores de linearidade, coeficientes de varia??o, assim tamb?m como percentuais de recupera??o bastante satisfat?rios. Para os testes de efici?ncia de redu??o da DQO foi obtido um percentual m?dio de 64,4 %. Os comportamentos crescentes dos resultados para os testes de SST e SSV mostraram que os lodos ativados foram bem adaptados. As melhores condi??es operacionais para redu??o de DQO foram verificadas quando operados com concentra??es medianas de DBT, maiores tempo para biodegrada??o, e pH tanto na faixa ?cida quanto na b?sica. A biodegrada??o do DBT foi confirmada avaliando-se a presen?a do 2-HBF. As maiores concentra??es de 2-HBF foram obtidas nos extremos das concentra??es de DBT e de pH, e em maiores tempos de biodegrada??o. / During the oil refining process a huge discard volume of water occurs, which carries the contaminants from the process. A class of contaminant compounds resulting from the petrochemical industry are the Polyaromatic Hydrocarbons (PAH's). To evaluate the biodegradation of Dibenzothiophene in refinery water a synthetic wastewater was prepared to be treated using activated sludge. For this, a 2 3 Composite Design (plus 3 central points and six axial points) was carried out. The planning had as independent variables (factors) the initial concentration of DBT, pH and time of biodegradation. Biodegradation of DBT was assayed following the parameters COD, pH, temperature, SS, VSS, FVS, SVI. Concerned to the chromatographic conditions, a methodology was validated in order to verify the presence of DBT and its metabolite, 2-HBF, in the final wastewater treated by activated sludge system using a liquid - liquid extraction coupled to HPLC / UV analysis. The parameters used for validation were DL, QL, linearity, recovery and repeatability. As for optimization, the results indicated that the studied methodology can be used in monitoring the DBT degradation and 2- HBF by activated sludge, as they showed excellent linearity values, coefficients of variation, so as satisfactory recovery percentage. COD reduction efficiency tests showed an average percentage of 64.4%. The increasing trend for the results for the TSS and VSS tests showed that the activated sludge was well tailored. The best operating conditions for the reduction of COD were observed when operated with median concentrations of DBT, a higher time to biodegradation, and pH in both the acidic range as the basic one. The biodegradability of the DBT was confirmed by determining the presence of HBF-2. The highest concentrations of HBF-2 were obtained in extreme concentrations of DBT and pH, and higher biodegradation times.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-03-09T23:41:38Z No. of bitstreams: 1 WedinaRodriguesDeLima_DISSERT.pdf: 1359852 bytes, checksum: 947641e57effa75408f6f9568cca76ff (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-03-14T19:51:43Z (GMT) No. of bitstreams: 1 WedinaRodriguesDeLima_DISSERT.pdf: 1359852 bytes, checksum: 947641e57effa75408f6f9568cca76ff (MD5) / Made available in DSpace on 2016-03-14T19:51:43Z (GMT). No. of bitstreams: 1 WedinaRodriguesDeLima_DISSERT.pdf: 1359852 bytes, checksum: 947641e57effa75408f6f9568cca76ff (MD5) Previous issue date: 2015-02-20 / As lagoas de estabiliza??o s?o sistemas de tratamento biol?gico que constituem alternativa vantajosa, ao possibilitarem elevada remo??o de mat?ria org?nica e microrganismos patog?nicos, al?m de sua opera??o e manuten??o ser de forma simplificada e com baixo custo. A pesquisa foi realizada em sete sistemas de lagoas de estabiliza??o em s?rie, localizados no Estado do Rio Grande do Norte, compostos por uma lagoa facultativa (LF), seguida de duas lagoas de matura??o (M1 e M2). Com o objetivo de monitorar e avaliar a efici?ncia das lagoas em s?rie, bem como verificar a remo??o de cianobact?rias e microcistina no tratamento, foram realizadas coletas do efluente tratado diretamente nas caixas de sa?da das lagoas facultativas e matura??es, bem como o esgoto bruto (EB) que chegava ?s esta??es. As vari?veis analisadas foram: pH, temperatura, oxig?nio dissolvido, s?lidos suspensos totais, clorofila ?a? , cor aparente, demanda bioqu?mica de oxig?nio (DBO), demanda qu?mica de oxig?nio (DQO), f?sforo total, nitrog?nio org?nico, nitrog?nio amoniacal, nitrog?nio total Kjeldahl, turbidez, densidade de cianobact?rias e concentra??es de microcistina. Foram realizadas an?lises de vari?ncia (ANOVA- an?lise de um fator), observando as premissas utilizando o teste de Tukey. Nos efluentes finais foram verificadas remo??es de DBO de 48,8% (Pipa) a 75,8% (Cai?ara do Rio do Vento) e DQO 57,5% (Pipa) a 83,0% (Santo Ant?nio), respectivamente. As concentra??es m?dias da densidade de cianobact?rias das LF variaram entre 62 x 103 cels.mL-1 (Pedro Velho Ro?a) a 2 x 106 cels.mL-1 (Ponta Negra), enquanto os efluentes finais apresentaram entre a faixa de 9 x 103 cels.mL-1 (Pedro Velho Ro?a) a 1,9 x 106 cels.mL-1 (Macau ? Ilha de Santana). A concentra??o m?xima do efluente final de microcistina foi 0,13 ?g.L-1 (S?o Gon?alo). Em s?ntese, as esta??es de tratamento de esgoto avaliadas, apresentaram uma baixa efici?ncia na remo??o da mat?ria org?nica e de nutrientes. Mas em contrapartida, na maioria das esta??es, foi verificado um bom desempenho referente ? remo??o da densidade de cianobact?rias, bem como o baixo n?vel de concentra??es de microcistina. / Stabilization ponds are biological treatment systems in that stabilization of organic matter is performed by the bacterial oxidation and / or reduction of photosynthetic algae. This study aimed to monitor and evaluate the efficiency of stabilization ponds in the Rio Grande do Norte State. Collections were made of the treated effluent, made directly in the output boxes of facultative lagoons and maturation (M1 and M2) and raw sewage (EB) that arrived at the stations. The variables analyzed were: pH, temperature, dissolved oxygen, total suspended solids, chlorophyll "a", apparent color, total phosphorus, organic nitrogen, ammonia nitrogen, Kjeldahl nitrogen, turbidity, cyanobacteria density and concentrations of microcystin. Variance analysis (ANOVA one way) observing the premises using the Tukey test, so as to check differences between treatments. The evaluate the stations found to COD removals in the bands of 48,8% (Pipa) to 75,8% (Cai?ara Rio do Vento) and 57,5% (Pipa) to 83,0% (Santo Ant?nio), respectively. The mean concentrations of cyanobacteria varied from LFs density of 62,545 cels.mL-1 (Pedro Velho Ro?a) cels.mL-1 to 2,669,048 (Ponta Negra), while the final effluent showed range between 9,072 Cels.mL- 1 (Pedro Velho Ro?a) to 1,899,981 cels.mL-1 (Macau ? Ilha de Santana) and the average concentrations of microcystin the final effluent ranged from 0.02 ?g.L-1 (Ponta Negra) to 0.15 ?g.L-1 (Macau ? Ilha de Santana) at the studied the stations.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-04-15T20:28:21Z No. of bitstreams: 1 LarynneDantasDeSenna_DISSERT.pdf: 2775430 bytes, checksum: 1f765d0818e89af5941a1275fe961a99 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-04-19T23:40:44Z (GMT) No. of bitstreams: 1 LarynneDantasDeSenna_DISSERT.pdf: 2775430 bytes, checksum: 1f765d0818e89af5941a1275fe961a99 (MD5) / Made available in DSpace on 2016-04-19T23:40:44Z (GMT). No. of bitstreams: 1 LarynneDantasDeSenna_DISSERT.pdf: 2775430 bytes, checksum: 1f765d0818e89af5941a1275fe961a99 (MD5) Previous issue date: 2015-06-02 / P ara contribuir no desempenho das pol?ticas e estrat?gias formuladas por comit?s de bacia hidrogr?fica , ?ndices v?m sendo criados na expectativa de expressar as m?ltiplas dimens?es dos recursos h?dricos em u ma forma facilmente interpret?vel. O uso do ?ndice de Pobreza H?drica (WPI) est? se difundindo mundialmente, sendo o mesmo formado pela combina??o dos sub?ndices Recurso, Acesso, Capacidade, Uso e Ambiente. A lgumas cr?ticas quanto ? f orma??o do WPI foram surgindo , de ntre elas destaca - s e a atribui??o de pesos dos sub ?ndices, feita por um processo arbitr?rio atribuindo subjetividade ao crit?rio de sele??o. Ao envolver an?lise estat?stica, quando se considera as caracter?sticas das vari?veis geradas pe la An?lise de Componentes Principais (ACP), verifica - se que a mesma ? capaz de solucionar esse problema . O objetivo deste trabalho ? comparar os resultados do WPI original com o ?ndice gerado atrav?s da An?lise de Componentes Principais (ACP), par a a indic a??o dos pesos dos sub ?ndices aplic?veis na bacia hidrogr?fica do Rio Serid? (RN e PB) . Conclui - se que o uso da An?lise de Componentes Principais na atribui??o do s pesos do ?ndice de Pobreza H?drica permitiu identificar que os sub - ?ndices Recurso, Acesso e Ambiente s?o os mais representativos para a bacia hidrogr?fica do Rio Serid? , e que este novo ?ndice, o WPI?, apresentou faixas de valores mais abra ngentes, permitindo identificar mais facilmente as disparidades entre os munic?pios. Al?m disso, a avalia? ? o dos sub ?ndices na ?rea de estudo tem grande potencial de informar ao tomador de decis?o na gest?o dos recursos h?dricos, as localidades mais cr?ticas e que merecem maiores investimentos nos aspectos analisados, j? que o ?ndice em si n?o permite captar essa informa??o. / To contribute in the performance of policies and strategies formulated by development agencies, indexes have been created in anticipation of expressing the multiple dimensions of water resources in an easily interpretable form. Use of Hydro Poverty Index ( WPI) is spreading worldwide , with the same formed by the combination of sub - indices Resource, access, capacity , use and environment. S ome critics a s to its formation have emerged, a mong them stands out the allo cation of weights of sub - indexes , made by an arbitrary process attributing subjectivity to the selection criteria. By involving statistical analysis, when considering the characteristics of the variables generated by the Principal Component Analysis (PCA), it turns out that it is able to solve this problem. The objective of this study is to compare the results of the original WPI with content generated by Principal Com ponent Analysis (PCA) for the indicati on of the weights of sub - indec es applicable in the Serid? River hydrographic Basin . We conclude that the use of Principal Component Analysis in the allocation of weights of Water Poverty Index has identified the sub - indices Resources, Access and Environment are the most representative for the river basin Serid? , and that this new index, WPI' , presented the most comprehensive ranges of values , allowing more easily identify disparities among municipalities. In addition, t he evaluation of the sub - indec es in the study area has great potential to inform the decision - maker in the management of water resources, the most critical locations and deserve greater investments in the aspects analyzed, as the index itself can not cap ture this information.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-04-25T21:03:05Z No. of bitstreams: 1 TadeuFelixDosSantos_DISSERT.pdf: 1188872 bytes, checksum: 47b34679279af1fc33a4e33479484fde (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-04-27T19:21:27Z (GMT) No. of bitstreams: 1 TadeuFelixDosSantos_DISSERT.pdf: 1188872 bytes, checksum: 47b34679279af1fc33a4e33479484fde (MD5) / Made available in DSpace on 2016-04-27T19:21:27Z (GMT). No. of bitstreams: 1 TadeuFelixDosSantos_DISSERT.pdf: 1188872 bytes, checksum: 47b34679279af1fc33a4e33479484fde (MD5) Previous issue date: 2015-09-02 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / Este estudo oferece uma abordagem anal??tica que visa determinar o campo de temperaturas desenvolvido durante a soldagem TIG DC sobre uma placa fina de Alum??nio. As caracter??sticas n?ao-lineares do fen?omeno, tais como a depend?encia das propriedades termof??sicas e mec?anicas do material com a temperatura, s?ao consideradas nesse estudo. Al?em do processo de troca de calor por condu?c?ao, s?ao levadas em considera?c?ao as trocas por convec?c?ao natural e radia?c?ao. Uma an?alise transiente foi realizada a fim de se avaliar o comportamento temporal do campo de temperatura. Tamb?em uma modelagem tridimensional para a fonte de calor foi discutida. Com a finalidade de validar os resultados obtidos atrav?es do modelo anal??tico, foi feito o confronto destes com aqueles obtidos experimentalmente e os dispon??veis na literatura. As respostas anal??ticas obtidas apresentam uma boa correla?c?ao com as experimentais dispon??veis na literatura, comprovando assim a viabilidade e efici?encia deste m?etodo anal??tico na simula?c?ao do ciclo t?ermico para este tipo de soldagem. / This study offers an analytical approach in order to provide a determination of the temperature field developed during the DC TIG welding of a thin plate of aluminum. The non-linear characteristics of the phenomenon, such as the dependence of the thermophysical and mechanical properties with temperature were considered in this study. In addition to the conductive heat exchange process, were taken into account the exchange by natural convection and radiation. A transient analysis is performed in order to obtain the temperature field as a function of time. It is also discussed a three-dimensional modeling of the heat source. The results obtained from the analytical model were be compared with the experimental ones and those available in the literature. The analytical results show a good correlation with the experimental ones available in the literature, thus proving the feasibility and efficiency of the analytical method for the simulation of the heat cycle for this welding process.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-05-30T23:20:44Z No. of bitstreams: 1 JulianaRicardoDeSouza_TESE.pdf: 14513350 bytes, checksum: 9e7d4d9cfe9132db18a4d5ee9940a771 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-06-01T23:23:24Z (GMT) No. of bitstreams: 1 JulianaRicardoDeSouza_TESE.pdf: 14513350 bytes, checksum: 9e7d4d9cfe9132db18a4d5ee9940a771 (MD5) / Made available in DSpace on 2016-06-01T23:23:24Z (GMT). No. of bitstreams: 1 JulianaRicardoDeSouza_TESE.pdf: 14513350 bytes, checksum: 9e7d4d9cfe9132db18a4d5ee9940a771 (MD5) Previous issue date: 2015-06-05 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / A estocagem de rejeitos de scheelita a ?c?u aberto? resultante da explora??o da mina Breju? da regi?o de Currais Novos, Rio Grande do Norte, Brasil, tem gerado, no per?odo 1960-2015, um forte passivo ambiental. O pol?mero politetrafluoretileno (PTFE) majora em sistemas de deslizamento e reduz significativamente custos de manuten??o, devido ?s suas excelentes propriedades mec?nicas, tais como baixo coeficiente de atrito (0,01< m <0,10) e limite de escoamento da ordem de 10 MPa. No entanto, apresenta elevadas taxas de desgaste (10-13 m2/N) e por despertar o interesse cient?fico e tecnol?gico nas ind?strias petroqu?mica e aeroespacial na forma de lubrificantes s?lidos, objetivou-se desenvolver comp?sitos polim?ricos com matriz de PTFE utilizando-se o rejeito de scheelita como carga, viabilizando tamb?m processos de remedia??o ambiental. O Rejeito de Scheelita foi caracterizado na condi??o como adquirido, atrav?s de an?lises de DRX, FRX, MEV, EDS, granulometria por Peneiramento e a Laser, registrando-se tra?os de tungst?nio e metais estrat?gicos igualmente importantes. O PTFE foi analisado por TGA, DSC, MEV, DRX, FRX. Para o desenvolvimento dos comp?sitos misturou-se mecanicamente os p?s de PTFE e Rejeito de Scheelita, devidamente preparados e pesados. Para moldagem por compress?o ? quente projetou-se um molde cil?ndrico de a?o acoplado a uma resist?ncia inseridos numa prensa hidr?ulica. Avaliaram-se o desempenho tribol?gico dos comp?sitos obtidos a partir de Rugosidade, Dureza, Molhabilidade, Absor??o ao impacto, Esclerometria, Pino Disco e Analise Morfol?gica. Os resultados indicam que a varia??o no teor de rejeito de scheelita influ?ncia nos resultados de rugosidade, dureza e absor??o ao impacto. Comp?sitos molhados com ?gua salina e destilada caracterizaram-se como hidrof?bicos, enquanto que os molhados com ?leo paraf?nico e naft?nico como oleof?licos. Correlacionando os resultados dos ensaios tribol?gicos e custos constatou-se que a composi??o de 20% de Rejeito de Scheelita apresentou a melhor planicidade, baixo consumo de energia de deforma??o espec?ficica (<0,30 J/mm3), a menor perda m?ssica (8x10-3g) e afundamento da pista (<0,4 ?m/km). / The storage scheelite tailings in the open air as a result of Breju? mine exploration, located near Currais Novos, Rio Grande do Norte, Brazil, between 1960 and 2015, a strong environmental passive. The polymer polytetrafluoroethylene (PTFE) outstands in sliding systems and significantly reduces maintenance costs, due to its excellent mechanical properties, such as low friction coefficient (0,01< ? <0,10) and yield limit to the order of 10MPa. However, it has high wear rates (10-13 m2/N) and for arousing scientific and technological interests at petrochemical and aerospace industry, in the form of solid lubricants, the target was to develop polymeric composites with a PTFE matrix using tailings of scheelite as charge, enabling also environmental remediation processes. The tailing of Sheelite was characterized in acquired conditions, through XRD, XRF, SEM, EDS, granulometry by screening and by laser, recording traces of tungsten and strategic metals equally important. The PTFE was analyzed by TG, DSC, SEM, XRD, XRF. To the composites development, powders of PTFE and tailings of sheelite were mechanically mixed, previously prepared and weighed. To hot compression molding, a designed cylindrical steel mould was coupled with a resistor and placed in a hydraulic press. The composite?s tribological performance was evaluated from roughness, hardness, wettability, impact absorption, sclerometry, pin on disc, and morphological analysis. The results show that the variation in the tailing of scheelite concentration influences the results of roughness, hardness and impact absorption. Wet composites with saline and distilled water were characterized as hydrophobic, and the ones wet with paraffenic and naphtenic oil, they acted oleophilic. Correlating the results of tribological tests and costs, it was found that the composition of 20% mineral filler showed better planeness, low specific deformation energy consumption (<0,30J/mm?), the lowest mass loss (8x10-4g) and trail shipwreck (<0,4?m/km).

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-06-14T20:19:26Z No. of bitstreams: 1 WalckerDaSilvaGomes_DISSERT.pdf: 2106544 bytes, checksum: f499db87815fef5a350b0e5695e9a0f1 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-06-15T23:51:48Z (GMT) No. of bitstreams: 1 WalckerDaSilvaGomes_DISSERT.pdf: 2106544 bytes, checksum: f499db87815fef5a350b0e5695e9a0f1 (MD5) / Made available in DSpace on 2016-06-15T23:51:48Z (GMT). No. of bitstreams: 1 WalckerDaSilvaGomes_DISSERT.pdf: 2106544 bytes, checksum: f499db87815fef5a350b0e5695e9a0f1 (MD5) Previous issue date: 2015-12-04 / A agricultura ? uma atividade essencial ao desenvolvimento humano e a tend?ncia ? que sua necessidade aumente, de acordo com o aumento da popula??o mundial. ? de grande import?ncia tirar o m?ximo desempenho poss?vel de cada terreno, sem degrad?-lo e um constante monitoramento ? essencial para melhor?-lo. A proposta desta pesquisa ? - de forma n?o agressiva a meio ambiente - monitorar a condutividade el?trica superficial do solo em uma ?rea demarcada (uma planta??o, por exemplo) utilizando, para isto, ondas de r?dio de baixa frequ?ncia. A condutividade est? diretamente ligada ? quantidade da ?gua e de nutrientes naquela ?rea e um monitoramento peri?dico, ou mesmo permanente, aumenta significantemente o uso eficiente do solo. Para este trabalho ser?o utilizadas transmiss?es de r?dio de ondas longas ou m?dias (30 kHz a 3000 kHz) que tem como principal caracter?stica a propaga??o pela superf?cie da terra. Pode-se escolher uma r?dio AM com localiza??o, frequ?ncia e pot?ncia de transmiss?o conhecidas, ou gerar o pr?prio sinal, essas medi??es foram realizadas com um analisador de intensidade de campo eletromagn?tico. Os dados obtidos nas medi??es s?o tratados por um programa de c?lculo num?rico, no nosso caso o Matlab. O m?todo estudado calcula a condutividade do solo numa linha reta, entre dois pontos medidos, tornando sua utiliza??o poss?vel em planta??es de pequeno, m?dio ou grande porte. Conclui-se que as recomenda??es da ITU (International Telecommunication Union) sobre a condutividade do solo no Brasil fica longe da realidade, em algumas rotas as recomenda??es indicam o uso da condutividade el?trica do solo de 1 mS/m, enquanto nas medi??es foi encontrado 19 mS/m. Com estas informa??es ? poss?vel manter um banco de dados, com capacidade de prever a ?rea e o momento mais adequados para irriga??es e aduba??o, tornando o manejo mais eficiente e menos dispendioso, al?m de otimizar o uso da ?gua, recurso natural cada vez mais preciso. / Agriculture is an essential activity to the human development, the tendency is that their need to increase according to the increase in world population. It is very important to take the maximum performance that is possible of each land without degrading it, a frequently monitoring is essential for the best performance. The purpose of this work is, nondestructively, to monitor the surface electrical conductivity of the soil in a demarcated area, as on a plantation, using low frequency radio waves. The conductivity is directly linked to the amount of water in the area and nutrients, therefore a periodic or even permanent monitoring increases significantly the efficient of the use of the soil. They will be used long-wave radio transmission or medium whose main characteristic to spread over the surface of the earth. It is possible to choose an AM radio with location, frequency and power of the transmission known or generate the signal. The studied method computes the conductivity of the ground in a straight line between two measured points, so it can be used in smaller or larger size fields. Measurements were carried out using an electromagnetic field strength analyzer. The data obtained in the measurements are processed by a numerical calculation program, in our case Matlab. It is concluded that the recommendations of the ITU (International Telecommunication Union) on the conductivity of soil in Brazil is far from reality, on some routes the recommendations indicate the use of the electrical conductivity of the soil 1 mS/m, while the measurements was found 19 mS/m. With the method described a precision farmer, once initial research for about a year, can monitor the humidity and salinity of the land, with the ability to predict the area and the most suitable time for irrigation and fertilization, making management more efficient and less expensive, while optimizing water use, natural resource increasingly precious.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-06-15T00:30:07Z No. of bitstreams: 1 ArturMoura_DISSERT.pdf: 9075980 bytes, checksum: e2a8d1090b82fe63fcd2e3b9128aec3a (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-06-20T19:00:23Z (GMT) No. of bitstreams: 1 ArturMoura_DISSERT.pdf: 9075980 bytes, checksum: e2a8d1090b82fe63fcd2e3b9128aec3a (MD5) / Made available in DSpace on 2016-06-20T19:00:23Z (GMT). No. of bitstreams: 1 ArturMoura_DISSERT.pdf: 9075980 bytes, checksum: e2a8d1090b82fe63fcd2e3b9128aec3a (MD5) Previous issue date: 2015-12-18 / Atualmente, vive-se em uma ?poca de escassez de cr?dito provocada pela crise financeira mundial, e a exemplo do ocorrido no passado, cabem aos mais diversos setores e segmentos da sociedade buscar meios para se reinventar. Nesse contexto, a Lean Construction se apresenta como uma forte alternativa de gest?o da produ??o para empresas do segmento de constru??o civil. Advinda da mentalidade enxuta que teve sua origem no Jap?o no per?odo p?s-guerra e se difundiu pelo mundo em ?pocas de extrema escassez com a crise do petr?leo. Na pr?tica a Lean Construction ? uma filosofia que busca aperfei?oar o processo de gest?o da produ??o, maximizando o fluxo do valor a partir da ?tica do cliente atrav?s da elimina??o das perdas. E prospera em ambientes e culturas que consideram a escassez de recursos como algo natural, aplicando-se tanto a ?pocas de crise macroecon?micas como de prosperidade. O Planejamento e Controle da Produ??o - PCP apresenta-se como alicerce fundamental para que as empresas se protejam diante das flutua??es econ?micas, visando sua sobreviv?ncia e sucesso no disputado mercado. Motivado pela car?ncia de discurs?o do tema na academia local, e, pela identifica??o dos 93,33% de construtoras que n?o fazem o uso de metodol?gico de ferramentas para o PCP no estado, a presente disserta??o objetiva estudar e propor a implementa??o da constru??o enxuta na metodologia de planejar empreendimentos aplicados em canteiros de obras. Nesta caracterizou-se o sistema de gest?o da produ??o de uma empresa construtora, apontando as principais causas da inefic?cia relacionadas a consequente baixa no desempenho de um de seus empreendimentos. Na sequ?ncia implementou-se o PCP com o uso de ferramentas para atendimento aos princ?pios da constru??o enxuta. Sendo este monitorado atrav?s de indicadores que proporcionaram aos gestores a vis?o gerencial do processo de controle das a??es e mecanismos de prote??o da produ??o. Todas as diretrizes de implementa??o e aplica??o deste modelo de gest?o, foram expostas de maneira simplificada, pr?tica e eficiente, visando quebrar a resist?ncia de novas pr?ticas e antigos paradigmas do setor. / Nowadays lives up in an era of tight credit caused by the global financial crisis, as occurred in the past, it is the responsibility of various sectors and segments of society find ways to reinvent itself. In this context, Lean Construction presents itself as a strong alternative production management for companies in the construction segment. Arising out of lean thinking that originated in Japan in the postwar period and has spread around the world in times of extreme scarcity with the oil crisis. In practice the Lean Construction is a philosophy that seeks to improve the process of production management, maximizing the value of the flow from the customer's perspective through the elimination of losses. And thrives in environments and cultures that consider the scarcity of resources like something natural, applying both the macroeconomic crisis as in times of prosperity. The Planning and Production Control - PCP presents itself as a fundamental building block for companies to protect themselves in the face of economic fluctuations, seeking for their survival and success in the competitive market. Motivated by the lack of discussion of the topic in the local academy, and for the identification of 93.33% of construction companies that do not make use of methodological tools for PCP in the state, this dissertation aims to study and propose the implementation of lean construction in methodology of planning projects implemented on construction sites. This characterized the management system, of the production of a construction company, pointing out the main causes of ineffectiveness related to consequent low performance of one of his ventures. In sequence, the PCP was implemented with the use of tools to serve the principles of lean construction. This being monitored through indicators that provided managers managerial view of process of actions control and production of protective mechanisms. All implementation guidelines and application of this management model, were exposed in a simplified way, practical and efficient, in order to break the resistance of new practices and old paradigms in the industry.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-06-23T21:56:21Z No. of bitstreams: 1 JoseEuricoDeQueiros_DISSERT.pdf: 2915990 bytes, checksum: 8ca47eabc8fbaa8d3e172df92fb3c088 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-06-28T22:07:28Z (GMT) No. of bitstreams: 1 JoseEuricoDeQueiros_DISSERT.pdf: 2915990 bytes, checksum: 8ca47eabc8fbaa8d3e172df92fb3c088 (MD5) / Made available in DSpace on 2016-06-28T22:07:28Z (GMT). No. of bitstreams: 1 JoseEuricoDeQueiros_DISSERT.pdf: 2915990 bytes, checksum: 8ca47eabc8fbaa8d3e172df92fb3c088 (MD5) Previous issue date: 2015-12-15 / Neste trabalho, avalia-se o desempenho de argamassas ? base de cimento Portland para rejuntamento de placas cer?micas tipo II com adi??o de p? de borracha de pneus inserv?veis. Apresenta-se uma revis?o bibliogr?fica sobre o tema (SEGRE, 1999; MENEGUINI, 2003; FERREIRA, 2009; GUIMAR?ES, 1997; FIORITO, 1994), em que se faz a ancoragem te?rico-metodol?gica de todo o processo investigativo. O universo analisado compreende uma amostra de argamassa para rejuntamento de placas cer?micas tipo II convencional (amostra de refer?ncia) e de mais cinco amostras de argamassas para rejuntamento de placas cer?micas tipo II, compostas com adi??o de p? de borracha de pneu inserv?veis, nas respectivas propor??es de 4, 8, 12, 16 e 20 %. Essas amostras de argamassas foram submetidas aos ensaios de determina??o do ?ndice de consist?ncia (NBR 13276:2005), reten??o de ?gua (NBR 14992 Anexo B:2003), permeabilidade aos 240 minutos (NBR 14992 Anexo G:2003), Absor??o de ?gua por imers?o (NBR 9781:2013), resist?ncia ? compress?o (NBR 14992 Anexo D:2003), resist?ncia ? tra??o na flex?o (NBR 13279:2005), resist?ncia de ader?ncia ? tra??o (NBR 14081 Parte 4:2012) e densidade de massa no estado endurecido (NBR 13280:2005). Constatou-se, a partir das an?lises dos resultados obtidos nos ensaios, a seguinte situa??o: a argamassa de refer?ncia utilizada atendeu ?s exig?ncias estabelecidas nas normas de especifica??es correspondentes para apenas seis do total de oito par?metros avaliados na pesquisa; a argamassa com adi??o de 4,0 % de p? de borracha de pneu atendeu ?s exig?ncias estabelecidas nas normas de especifica??es correspondentes para, apenas, a resist?ncia ? compress?o e a resist?ncia de ader?ncia ? tra??o; as demais argamassas com adi??o de 8,0 %, 12,0 %, 16,0 % e 20,0 % de p? de borracha de pneu atenderam ?s exig?ncias das normas de especifica??es correspondentes, apenas quanto ? resist?ncia de ader?ncia ? tra??o. Esse resultado evidencia a conclus?o de que a adi??o de p? de borracha de pneu n?o confere melhoria de desempenho ?s argamassas. / In this work it is assessed the performance of Portland cement-based mortar to the grouting of type II ceramic plates with the addition of unusable tire rubber powder. It is presented a bibliographical review about the subject in which is done the theoretical and methodological foundation of the whole investigative process. The analyzed universe comprises a sample of mortar to the grouting of conventional ceramic plates type II (reference sample) and five more samples to the grouting of ceramic plates type II, which were made up of the addition of unusable tire rubber powder in the respective proportion (in mass) of 4%, 8%, 12%, 16% and 20%. These mortar samples were subject to the trials of determination of the consistency index (Brazilian Standard NBR 13276:2005), water retention ( Brazilian Standard NBR 14992 Attachment B:2003), permeability in 240 minutes (Brazilian Standard NBR 14992 Attachment G:2003), absorption of water by immersion (Brazilian Standard NBR 9781:2013), resistance to compression (Brazilian Standard NBR14992 Attachment D: 2003), resistance to traction in the flexion (Brazilian Standard NBR 13279:2005), resistance of traction adherence (Brazilian Standard NBR 14081 part 4:2012) and hardened mass density (Brazilian Standard NBR 13280: 2005). It has been found out from the analyzes of the results in the trial the following situation: the reference mortar used met the established requirements in the norms of specifications corresponding to only six from the eight parameters assessed in the research; the mortar with addition of 4,0% of tire rubber powder met the established requirements corresponding to only the resistance to compression and the resistance of adherence to traction. Thus, the other kinds of mortar with addition of 8,0 %, 12,0 %, 16,0 % and 20,0 % of tire rubber powder met the requirements of specifications corresponding to only the resistance to compression and the resistance of adherence to traction. This result concludes that the adding of tire rubber powder does not grant improvement to the mortar of type II grouting to the laying of ceramic plates.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-07-22T15:37:57Z No. of bitstreams: 1 VivianMariaDeArrudaMagalhaes_DISSERT.pdf: 2346650 bytes, checksum: 8aef260736841bc9ac93307f974b2920 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-07-28T00:02:14Z (GMT) No. of bitstreams: 1 VivianMariaDeArrudaMagalhaes_DISSERT.pdf: 2346650 bytes, checksum: 8aef260736841bc9ac93307f974b2920 (MD5) / Made available in DSpace on 2016-07-28T00:02:14Z (GMT). No. of bitstreams: 1 VivianMariaDeArrudaMagalhaes_DISSERT.pdf: 2346650 bytes, checksum: 8aef260736841bc9ac93307f974b2920 (MD5) Previous issue date: 2016-01-28 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico (CNPq) / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / A biolixivia??o da calcopirita ainda n?o possui aplica??o em escala comercial devido ? baixa efici?ncia, por isso esse processo tem sido bastante estudado nos ?ltimos anos. A biolixivia??o de rejeito calcopir?tico se torna ainda mais dif?cil devido a presen?a de maior quantidade de impurezas, entre elas encontram-se os carbonatos. A presen?a de carbonatos no min?rio promove o aumento do pH da solu??o podendo inibir o desenvolvimento da biolixivia??o. Assim, essa pesquisa tem como objetivo a aplica??o do tratamento ?cido para otimiza??o do processo de biolixivia??o, a fim de recuperar o cobre perdido ao longo do processo al?m de reduzir o teor desse metal t?xico na lagoa de rejeitos. A remo??o e recupera??o de metais t?xicos ? grande relev?ncia na prote??o do meio ambiente e para sa?de dos seres humanos. Os experimentos de biolixivia??o foram realizados em duas etapas, na primeira fez-se uso do rejeito pr?-tratado com ?cido sulf?rico na biolixivia??o e na segunda fez-se uso do rejeito sem tratamento, com a adi??o de ?cido sulf?rico no in?cio da biolixivia??o. O tratamento ?cido foi realizado em biorreatores com a adi??o de tr?s volumes diferentes de H2SO4 96% e um experimento controle. Todos os experimentos de biolixivia??o foram realizados em triplicada mais um controle, sem adi??o de in?culo. Os resultados mostraram que o tratamento ?cido foi eficiente na remo??o dos carbonatos e conseguiu promover a biolixivia??o da calcopirita em ambas as etapas estudadas, sendo poss?vel atingir cerca de 47% de recupera??o de cobre ao final dos experimentos. / The bioleaching of chalcopyrite has not been applied on a commercial scale due to the low process efficiency, so this process has been extensively studied in recent years. The bioleaching of chalcopyrite tailings becomes even more difficult by the presence of higher amounts of impurities, among them are the carbonates. The presence of carbonates in the ore promotes the increase in pH of the solution and may inhibit the development of bioleaching. Therefore, this research aims to apply the acid treatment for optimization of bioleaching process, in order to recover the lost copper throughout the process besides reducing the content of this toxic metal in the tailings pond. The removal and recovery of toxic metals is very important in protecting the environment and human health. The bioleaching experiments were performed in two stages, the first made up using the pre-treated tailing with sulfuric acid in bioleaching, and the second was made using the tailing without treatment with sulfuric acid addition at the beginning of bioleaching. The acid treatment was carried out in bioreactors with three different volumes of H2SO4 96% and a control experiment. All bioleaching experiments were performed in triplicate over a control, without addition of inoculum. The results showed that acid treatment was effective in removal of carbonates and managed to promote a good performance in the bioleaching of chalcopyrite in both steps studied, it is demonstrated that circa 47% copper recovery can be achieved.