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You searched for subject:(Alum nio). Showing records 1 – 3 of 3 total matches.

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Universidade Estadual de Campinas

1. Garc?a P?rez, Tsai. Estudo da Influ?ncia do plasma de baixa press?o no comportamento mec?nico das uni?es adesivas metal-borracha .

Degree: 2010, Universidade Estadual de Campinas

Resumo: O presente trabalho enfoca processos de modifica??o de superf?cies de alum?nio e borrachas (neoprene e borracha but?lica) para promover ades?o entre estes dois materiais, e o estudo das uni?es obtidas. Os procedimento iniciou-se com o tratamento das borrachas e com o processo de limpeza da superf?cie do metal, mediante o emprego de plasma de baixa press?o, utilizando arg?nio, oxig?nio e misturas destes reagentes. Posteriormente, utilizou se hexametildisiloxano para o tratamento superficial do metal. Depois, as pe?as de alum?nio foram unidas com os elast?meros mediante o uso de um adesivo de cianoacrilato. Na avalia??o dos procedimentos de limpeza e ativa??o da superf?cie do metal e das borrachas, foi estudada a influ?ncia dos diferentes par?metros de opera??o sobre as caracter?sticas superficiais dos materiais tratados. As caracter?sticas das superf?cies tratadas foram avaliadas por interm?dio de an?lise goniom?trica, espectroscopia no infravermelho com Transformada de Fourier e microscopia eletr?nica de varredura. A avalia??o da ades?o metal-borracha foi empreendida por meio de processos padronizados, como o peel test. O processo de limpeza por plasma de baixa press?o permitiu obter, para o alum?nio, uma energia livre de superf?cie de 66,57 mN/m, o que equivale a um aumento de 99,6 %, se comparada com a mesma propriedade no material sem tratamento. O tratamento das borrachas com plasma aumentou o grau de molhabilidade da superf?cie, permitindo aumentar a for?a de ades?o das uni?es adesivas at? 40% no caso do neoprene e at? 25% no caso da borracha but?lica. A presen?a de hexametildisiloxano no plasma contribuiu para o aumento da resist?ncia mec?nica das juntas adesivas estudadas. O processo desenvolvido possibilitou obter juntas adesivas com uma resist?ncia de 22,4 kN/m, o que representou uma melhora de 75%, em compara??o com a resist?ncia de juntas produzidas com iguais materiais, mas sem aplica??o do processo desenvolvido; Abstract: This work involves surface modification of Aluminum and rubber surfaces (neoprene and butyl rubber) to promote bonding processes between these materials, as well as the study of the bonded joints. The process started with the rubber treatment and with a process to clean the aluminum surfaces by means of low pressure plasma. Argon, Oxygen or Argon/Oxygen mixtures were used as reagents. A surface treatment on the metal using Hexamethyldisiloxane was performed after that step. Next, the aluminum parts were bonded with the rubbers by means of cyanoacrylate glue. The influence of different plasma operating parameters on the surface's characteristics of the materials was studied during the evaluation of the cleaning, deposition, and activation steps. The characteristics of the surfaces were studied by means of goniometric analysis, FTIR, and SEM. The evaluation of the metal-rubber adhesion was performed by means of peel test. The results revealed that the cleaning process using low pressure plasma gives a surface energy on the aluminum of 66,57mN/m, corresponding to an increase of… Advisors/Committee Members: Bittencourt, Edison, 1941- (advisor), Massi, Marcos (committee member), Munhoz, Segundo Nilo Mestanza (committee member), Ravagnani, Sergio Persio (committee member), Peres, Leila (committee member).

Subjects/Keywords: Ades?o; Plasma (Gases ionizados); Superf?cie; Pol?meros; Alum?nio

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Garc?a P?rez, T. (2010). Estudo da Influ?ncia do plasma de baixa press?o no comportamento mec?nico das uni?es adesivas metal-borracha . (Thesis). Universidade Estadual de Campinas. Retrieved from http://repositorio.unicamp.br/jspui/handle/REPOSIP/266985

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Garc?a P?rez, Tsai. “Estudo da Influ?ncia do plasma de baixa press?o no comportamento mec?nico das uni?es adesivas metal-borracha .” 2010. Thesis, Universidade Estadual de Campinas. Accessed April 07, 2020. http://repositorio.unicamp.br/jspui/handle/REPOSIP/266985.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Garc?a P?rez, Tsai. “Estudo da Influ?ncia do plasma de baixa press?o no comportamento mec?nico das uni?es adesivas metal-borracha .” 2010. Web. 07 Apr 2020.

Vancouver:

Garc?a P?rez T. Estudo da Influ?ncia do plasma de baixa press?o no comportamento mec?nico das uni?es adesivas metal-borracha . [Internet] [Thesis]. Universidade Estadual de Campinas; 2010. [cited 2020 Apr 07]. Available from: http://repositorio.unicamp.br/jspui/handle/REPOSIP/266985.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Garc?a P?rez T. Estudo da Influ?ncia do plasma de baixa press?o no comportamento mec?nico das uni?es adesivas metal-borracha . [Thesis]. Universidade Estadual de Campinas; 2010. Available from: http://repositorio.unicamp.br/jspui/handle/REPOSIP/266985

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation


Universidade Estadual de Campinas

2. Melo, Mirian de Lourdes Noronha Motta. Analise numerico/experimental da forma??o de microporosidades durante a solidifica??o de ligas de aluminio .

Degree: 1996, Universidade Estadual de Campinas

Resumo: Este trabalho apresenta uma an?lise num?rico/experimental da forma??o de microporosidades interdendr?ticas durante a solidifica??o de ligas. Desenvolveu-se um modelo num?rico, baseado no m?todo de diferen?as finitas, que ? aplicado para a simula??o do processo de solidifica??o unidirecional. Este modelo permite a determina??o dos principais par?metros t?rmicos (perfis de temperatura, fra??o de s?lido, coeficiente de transfer?ncia de calor na interface metal/coquilha, gradientes t?rmicos, taxas de solidifica??o, posi??o das isotermas solidus e liquidus, velocidade de deslocamento das isotermas, tempo local de solidifica??o) e par?metros estruturais tais como espa?amentos interdendr?ticos prim?rios e secund?rios. O modelo permite tamb?m, a determina??o de par?metros diretamente relacionados com a previs?o da forma??o das microporosidades, como exemplo a permeabilidade dos canais interdendr?ticos e a solubilidade do hidrog?nio dentro da zona pastosa. A previs?o da forma??o de microporosidades leva em considera??o simultaneamente os efeitos da contra??o da liga e da evolu??o do hidrog?nio resultante da diferen?a de solubilidade do mesmo, nas fases l?quida e s?lida, durante a solidifica??o. Neste trabalho apresenta-se ainda, um estudo comparativo da influ?ncia das varia??es das principais propriedades termof?sicas da liga Al-4,5%Cu nos perfis de temperatura, na previs?o microestrutural, e na forma??o de microporosidades. Objetivando-se a comprova??o e otimiza??o do modelo desenvolvido, foram realizados ensaios experimentais empregando-se a liga Al-4,5%Cu, usando um forno especialmente constru?do, para solidifica??o unidirecional juntamente com um sistema de aquisi??o de dados computadorizado, e medidas in situ do teor de hidrog?nio no metal l?quido. Atrav?s de microscopia ?tica, obtiveram-se medidas dos espa?amentos interdendr?ticos prim?rio e secund?rio, incluindo tamb?m a determina??o das dimens?es, localiza??es e volume percentual das microporosidades. O modelo permite estabelecer o teor de gases e as condi??es t?rmicas ideais para minimizar a forma??o das microporosidades; Abstract: Microporosity formed during solidification in casting is one of the major problems which deteriorates the quality of the cast products. Many studies have been reported about this kind of defect. This study presents a numerical and experimental analysis of interdendritic rnicroporosity formation during solidification of metallic alloys. A numerical model was developed, based on the enthalpy approach and the finite difference method, to simulate the unidirectional solidification. This model permits the deterrnination of the main thermal parameters: temperature profiles, solid fraction, thermal gradients, solidificationrate, solid and liquid isotherms positions, isotherms velocities, local solidifacation time, and the structural parameters: primary and secondary arm spacing. The model developed also the deterrnination of the parameters directly related with the prediction of rnicroporosity formation, for example: the permeability of… Advisors/Committee Members: Santos, Rezende Gomes dos, 1947- (advisor), Goldenstein, Helio (committee member), Kiminami, Claudio Shyinti (committee member), Garcia, Amauri (committee member), Caram Junior, Rubens (committee member).

Subjects/Keywords: Solidifica??o; Modelagem (Fundi??o); Ligas de alum?nio; Diferen?as finitas

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Melo, M. d. L. N. M. (1996). Analise numerico/experimental da forma??o de microporosidades durante a solidifica??o de ligas de aluminio . (Thesis). Universidade Estadual de Campinas. Retrieved from http://repositorio.unicamp.br/jspui/handle/REPOSIP/265178

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Melo, Mirian de Lourdes Noronha Motta. “Analise numerico/experimental da forma??o de microporosidades durante a solidifica??o de ligas de aluminio .” 1996. Thesis, Universidade Estadual de Campinas. Accessed April 07, 2020. http://repositorio.unicamp.br/jspui/handle/REPOSIP/265178.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Melo, Mirian de Lourdes Noronha Motta. “Analise numerico/experimental da forma??o de microporosidades durante a solidifica??o de ligas de aluminio .” 1996. Web. 07 Apr 2020.

Vancouver:

Melo MdLNM. Analise numerico/experimental da forma??o de microporosidades durante a solidifica??o de ligas de aluminio . [Internet] [Thesis]. Universidade Estadual de Campinas; 1996. [cited 2020 Apr 07]. Available from: http://repositorio.unicamp.br/jspui/handle/REPOSIP/265178.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Melo MdLNM. Analise numerico/experimental da forma??o de microporosidades durante a solidifica??o de ligas de aluminio . [Thesis]. Universidade Estadual de Campinas; 1996. Available from: http://repositorio.unicamp.br/jspui/handle/REPOSIP/265178

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

3. [No author]. Contribui????o ao estudo de utilidade do Balanced Scorecard : um estudo de caso de uma empresa sider??rgica e metal??rgica operando no Brasil .

Degree: 2003, Fundação Escola de Comércio Álvares Penteado

In 1990, Robert S. Kaplan and David P. Norton developed in United States of America, a new system as support for decision 1, denominated Balanced Scorecard. Even supposing it is not an innovation once it is based on knowledge and principles enclosed in theories previously developed, the Balanced Scorecard has organized some of these theoretical principles, having as objective a "Control Panel" construction to manager the Companies strategy by monitoring financial results, through performance operational indicators that influence these results, growing the analysis capability and organizational knowledge. The published books and articles about Balanced Scorecard2, simplify the methodology description for its implementation and relate some of success cases occurred in companies from United States of America. The Balanced Scorecard is coming to an experimental phase in order to verify its principles and concepts adherence. Many companies operating in Brazil are implanting and implementing it, without divulgating the facilities and difficulties to align the management practices to the strategy and budget, premise that constitute the differentiation for the system to support decision. With these circumstances, the objective for this work is to contribute with the scientific research, presenting the practical experience of one company in activity in the country, by the theoretical principles of Balanced Scorecard applied, divulgating the results obtained and if the company had to recover to improvisation and adaptation to fit the situation not contemplated in Kaplan and Norton methodology developed. The research was made by bibliographical study and empirical research, in order to transmit the concepts that fundaments the Balanced Scorecard utilization, such as not mystify the facility proclaimed from its authors, from a field research done in Alcoa. The research was done based in two questionnaires, and one was constituted of 70 "opened" questions, applied in the Quality Manager, responsible to implanting and implementing the Balanced Scorecard in the company. The second questionnaire was constituted by 21 questions, tabulated in a scale like Likert, with eight levels, and it was applied in managers and users departments of Balanced Scorecard. Even though the Balance Scorecard theory establish facilities for its omplntation and implementation, the work hypothesis was confirmed, the implementation to the referred system needs adjustments and adaptations. These adjustment and adaptations are related to the people initiaves who are in the different hierarchical level to decide and the operate the actions to strategy and acquire knowledge to innovate the way of making the tasks. Other important factor is the difficult to measure objectively the strategy, throughout indicators inter-relation that mean the relation for cause and effect for these actions and iniciatives. Despite of adjustments and adaptations presented all long way, the Balanced Scorecard, constitute a recent tool, presenting evolution level, by the experiences… Advisors/Committee Members: Parisi, Claudio (advisor), CPF:14742962893 (advisor), http://lattes.cnpq.br/2891889803015460 (advisor).

Subjects/Keywords: Alcoa Alum??nio; Planejamento estrat??gico; Desempenho - Avalia????o; Contabilidade gerencial; Siderurgia - Estudo de casos; Strategic planning; Performance; Managerial accounting

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

author], [. (2003). Contribui????o ao estudo de utilidade do Balanced Scorecard : um estudo de caso de uma empresa sider??rgica e metal??rgica operando no Brasil . (Thesis). Fundação Escola de Comércio Álvares Penteado. Retrieved from http://132.0.0.61:8080/tede/handle/tede/619

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

author], [No. “Contribui????o ao estudo de utilidade do Balanced Scorecard : um estudo de caso de uma empresa sider??rgica e metal??rgica operando no Brasil .” 2003. Thesis, Fundação Escola de Comércio Álvares Penteado. Accessed April 07, 2020. http://132.0.0.61:8080/tede/handle/tede/619.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

author], [No. “Contribui????o ao estudo de utilidade do Balanced Scorecard : um estudo de caso de uma empresa sider??rgica e metal??rgica operando no Brasil .” 2003. Web. 07 Apr 2020.

Vancouver:

author] [. Contribui????o ao estudo de utilidade do Balanced Scorecard : um estudo de caso de uma empresa sider??rgica e metal??rgica operando no Brasil . [Internet] [Thesis]. Fundação Escola de Comércio Álvares Penteado; 2003. [cited 2020 Apr 07]. Available from: http://132.0.0.61:8080/tede/handle/tede/619.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

author] [. Contribui????o ao estudo de utilidade do Balanced Scorecard : um estudo de caso de uma empresa sider??rgica e metal??rgica operando no Brasil . [Thesis]. Fundação Escola de Comércio Álvares Penteado; 2003. Available from: http://132.0.0.61:8080/tede/handle/tede/619

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

.