Encontrados 21 documentos, a visualizar página 1 de 3
Design, construction and testing of aggregates of "microstrip" antennas
Guilherme F. M. da Silva; Carlos A. T. Campos; José Rocha PereiraThis paper describes a first approach on the microstrip antennas design. Several theoretical analysis technics are summarized. The analysis and design of standard rectangular patches is done using the cavity model.Some square and rectangular patches have been designedand measured in order to evaluate their main characteristics.Special attention was paid to the problem of matching thesepatches to ...
The role of nonequilibrium thermo-mechanical statistics in modern technologies ...
Rodrigues,Clóves G.; Silva,Antônio A. P.; Silva,Carlos A. B.; Vasconcellos,Áurea R.; Ramos,J. Galvão; Luzzi,RobertoThe nowadays notable development of all the modern technology, fundamental for the progress and well being of world society, imposes a great deal of stress in the realm of basic Physics, more precisely on Thermo-Statistics. We do face situations in electronics and optoelectronics involving physical-chemical systems far-removed-from equilibrium, where ultrafast (in pico- and femto-second scale) and non-linear pr...
Aspectos histológicos e morfométricos dos testículos de gatos domésticos (Felis...
Silva,Carlos A.O.; Perri,Silvia H.V.; Koivisto,Marion B.; Silva,Adelina M.; Carvalho,Roberto G.; Monteiro,Cristina M.R.Nesta pesquisa foram obtidos dados histológicos e morfométricos comparativos sobre os testículos de gatos, pós-orquiectomia, divididos em dois grupos: Grupo 1, gatos com até 1 ano de idade e Grupo 2, animais acima de 1 ano. Verificou-se que: (1) aos 4 meses de idade os túbulos seminíferos apresentaram-se pouco desenvolvidos e com ausência de luz, epitélio seminífero baixo, células de Sertoli indiferenciadas e t...
Aspect-oriented fault tolerance for real-time embedded systems
Afonso, Francisco; Silva, Carlos A.; Brito, Nuno; Montenegro, Sérgio; Tavares, AdrianoReal-time embedded systems for safety-critical applications have to introduce fault tolerance mechanisms in order to cope with hardware and software errors. Fault tolerance is usually applied by means of redundancy and diversity. Redundant hardware implies the establishment of a distributed system executing a set of fault tolerance strategies by software, and may also employ some form of diversity, by using dif...
Application-level fault tolerance in real-time embedded systems
Afonso, Francisco; Silva, Carlos A.; Tavares, Adriano; Montenegro, SérgioCritical real-time embedded systems need to make use of fault tolerance techniques to cope with operation time errors, either in hardware or software. Fault tolerance is usually applied by means of redundancy and diversity. Redundant hardware implies the establishment of a distributed system executing a set of fault tolerance strategies by software, and may also employ some form of diversity, by using different...
Applying aspects to a real-time embedded operating system
Afonso, Francisco; Silva, Carlos A.; Montenegro, Sérgio; Tavares, AdrianoThe application of aspect-oriented programming (AOP) to the embedded operating system domain is still a very controversial topic, as this area demands high performance and small memory footprint. However, recent studies quantifying aspects overheads in AspectC++ show that the resource cost is very low. Therefore, operating system development may benefit with the modularization of crosscutting concerns and syste...
Disponibilidade de micronutrientes em cinco solos em função do tempo de incubaç...
Silva,Fábio C. da; Silva,Carlos A.; Bergamasco,Alessandra F.; Ramalho,André L.O uso agrícola do composto de lixo (CL) nas lavouras constitui a alternativa econômica e ambiental viável, por ser fonte de nutrientes e matéria orgânica. Este estudo foi conduzido em casa de vegetação e teve o objetivo de avaliar a disponibilidade temporal de micronutrientes (Cu, Fe, Mn e Zn) por Mehlich-1, em cinco solos (Latossolo Vermelho-Amarelo distrófico: LVd; Argissolo Vermelho-Amarelo distrófico: PVd; ...
Describing framework static structure : promoting interfaces with UML annotations
Lopes, Sérgio F.; Tavares, Adriano; Monteiro, João L.; Silva, Carlos A.Frameworks are an important form of reuse that can help to significantly decrease the time and cost of application development. Although widely known, there are still some difficulties associated with framework reuse, which are critical to its success. In this paper, we focus on the issues regarding the framework reuse process, and more specifically, on the framework architecture description. This paper discuss...
Implementation of middleware fault tolerance support for real-time embedded app...
Afonso, Francisco; Silva, Carlos A.; Montenegro, Sérgio; Tavares, AdrianoCritical real-time embedded systems need to apply fault tolerance strategies to deal with operation time errors, either in hardware or software. In this paper we present the ongoing work to provide application fault tolerance by means of implementing middleware transparent support over the BOSS embedded operating system. The middleware uses a publishersubscriber protocol and enables the execution of several fau...
Middleware Fault Tolerance Support for the BOSS Embedded Operating System
Afonso, Francisco; Silva, Carlos A.; Montenegro, Sérgio; Tavares, AdrianoCritical embedded systems need a dependable operating system and application. Despite all efforts to prevent and remove faults in system development, residual software faults usually persist. Therefore, critical systems need some sort of fault tolerance to deal with these faults and also with hardware faults at operation time. This work proposes fault-tolerant support mechanisms for the BOSS embedded operating ...
| Financiadores do RCAAP | |||||||
|
|
|
|
|
|
||