Microelectronic
Mostrando 13-24 de 34 artigos, teses e dissertações.
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13. JustificaÃÃo de investimentos em tecnologias avanÃadas de manufatura: um framework para a avaliaÃÃo da opÃÃo de esperar, sob a Ãtica das opÃÃes reais
Evaluating capital investment projects for the adoption of advanced manufacturing technologies (AMT) is a critical task faced by manufacturing managers. Due to the normally high levels of risk and uncertainty involved, the traditional investment appraisal techniques are often insufficient and must be complemented by sophisticated evaluation methods. Since th
Publicado em: 2009
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14. Uma abordagem para analise e projeto de IPcores com geraÃÃo automÃtica de interfaces utilizando UML 2.0
Equipamentos cada vez mais sofisticados, capazes de agregar informaÃÃo, comunicaÃÃo e entretenimento em pequenos espaÃos e em qualquer lugar a um custo cada vez mais baixo tÃm alavancado o mercado de dispositivos microeletrÃnicos. Contudo, esta sofisticaÃÃo trouxe um aumento da complexidade dos projetos e um maior tempo para o desenvolvimento dos me
Publicado em: 2009
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15. Silício poroso funcionalizado com moléculas de azul de metileno para aplicações em sensores químicos. / Porous silicon functionalized with methylene blue molecules for chemical sensors applications.
O objetivo do presente trabalho é o desenvolvimento de nanocompósitos de silício poroso/azul de metileno (PS/MB) utilizando-se substratos de silício macroporoso e mesoporoso para sua aplicação no monitoramento de gases orgânicos. Foram estudados processos de formação de PS/MB usando PS macroporoso e controlando o pH da solução. Os resultados obtid
Publicado em: 2009
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16. Context modeling using ontologies. / Modelagem de contexto utilizando ontologias.
Advances in microelectronic processes have allowed smaller devices with more computation and communication power. Pervasive environment contains different devices like electronic sensor, actuators and mobile devices which interact with the person naturally after the context is known. The device and information diversity introduce an interoperability problem.
Publicado em: 2008
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17. Circuitos integrados de radio-recepção para a operação de multiplexação espacial de antenas em tempo real / Integrated circuits of radio-reception for spatial multiplexing of antennas in real time
This research aims the conception of new topologies of integrated circuits and its characterizations for operation in radio-receiver systems. The design and fabrication of RF switches, LNAs, mixer, and VCOs are presented. The SMILE - Spatial MultIplexing of Local Elements - technique was adopted due to its advantages and functionality for the intelligent ant
Publicado em: 2008
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18. Estudos da corrosão anisotrópica do silício frente soluções de KOH e sais metálicos. / Monocristalin silicon anisotropic etching study in KOH solution with metallic salts.
In the past few years it has been a huge evolution in industrial area of MEMS, and this one is characterized by the development of the processes of microelectronic to reduce cost and to integrate different systems that become very trustful in different applications. It is being done a work in silicon anisotropic etching in Potassium hydroxide (KOH) added wit
Publicado em: 2008
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19. Integrated passive inductors for radio frequency applications / Indutores integrados passivos para aplicações em radio frequencia
This work aims the design and implementation of integrated passive inductors based on CMOS and BiCMOS processes. The inductors are essential devices in radio frequency applications and are used in many RF circuits such as amplifiers and oscillators. The inductors performance is mainly limited by metal and substrate losses. Although various methods of improve
Publicado em: 2008
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20. Práxis dos docentes dos cursos técnicos e tecnológicos e as demandas do mundo de trabalho : um olhar na relação teoria e prática : um foco no TheoPrax
This dissertation brings to focus of analysis the pedagogical praxis of teachers of technical and technological courses in front of influences of technologicals innovations with base in the microelectronic and on the demands of the works world. We tried with this theme to superate the dichotomy between the theory and the practice in a investigation movement
Publicado em: 2008
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21. Caracterização de filmes finos de óxido de silício depositados em um reator HD-PECVD a partir de TEOS a ultra baixa temperatura. / Characterization of silicon dioxide thin films deposited in a HD-PECVD reactor from TEOS at ultra low temperature.
This work reports on the results obtained from high-density plasma enhanced chemical vapor deposited silicon oxide films at ultra low temperature, i.e. 30°C, using TEOS vapor as the silicon source oxidized with assistance of argon. The objectives of this work are: first, understand the phenomena that conducts the chemical vapor deposition in high density re
Publicado em: 2007
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22. Sensores eletroquímicos para detecção de íons e medida de pH baseados em filmes de silício poroso. / Electrochemical sensors to ions detection and pH measure based on porous silicon films.
O presente trabalho foi realizado com o objetivo de contribuir para o desenvolvimento tecnológico de sensores eletroquímicos utilizados na detecção de íons, especificamente, de íons de hidrogênio (H+). Na primeira parte do trabalho é descrito e discutido o estado da arte de sensores eletroquímicos de H+, principalmente de dispositivos sensíveis a �
Publicado em: 2007
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23. Fabricação e caracterização de Guia de Onda Polimerica a base de PMMA modificado por plasma de CHF3 / Polymeric optical waveguides fabricated by plasma fluorination process
Polymeric optical devices have been studied in communication and interconnection optics due to the intrinsic versatility of polymers molecular structure, that allows advantageous refractive index modeling for core and cladding, and also to their easy fabrication process or patterning capability. PMMA, polymethylmetacrylate, shows the best optical properties
Publicado em: 2007
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24. Construção e caracterização de fotodetetores metal-semicondutor-metal (MSM). / Construction and characterization of metal-semiconductor-metal (MSM) photodetectors.
The goal of this work was the fabrication of Metal-Semiconductor-Metal (MSM) photodetectors with the following characteristics: dark current of about 1 nA, responsivity of about 0.1 A/W and dark/photocurrent ratio of at least 10. These values ensure that the photodetectors have enough sensitivity to be used in integrated optic sensors. All materials used in
Publicado em: 2006