Explicit Representation of Exception Handling in the Development of Dependable Component-Based Systems

Exception handling is a structuring technique that facilitates the design of systems by encapsulating the process of error recovery. In this paper, we present a systematic approach for incorporating exceptional behaviour in the development of component-based software. The premise of our approach is that components alone do not provide the appropriate means to deal with exceptional behaviour in an effective manner. Hence the need to consider the notion of collaborations for capturing the interactive behaviour between components, when error recovery involves more than one component. The feasibility of the approach is demonstrated in terms of the case study of the mining control system

Software architecture for the cloud - a roadmap towards control-theoretic, model-based cloud architecture

The cloud is a distributed architecture providing resources as tiered services. Through the principles of service-orientation and generally provided using virtualisation, the deployment and provisioning of applications can be managed dynamically, resulting in cloud platforms and applications as interdependent adaptive systems. Dynamically adaptive systems require a representation of requirements as dynamically manageable models, enacted through a controller implementing a feedback look based on a control-theoretic framework. We argue that a control-theoretic, model-based architectural framework for the cloud is needed. While some critical aspects such as uncertainty have already been taken into account, what has not been accounted for are challenges resulting from the cloud architecture as a multi-tiered, distributed environment. We identify challenges and define a framework that aims at a better understanding and a roadmap towards control-theoretic, model-based cloud architecture - driven by software architecture concerns

Esquemas de cruzamentos em gado de leite.

bitstream/item/142951/1/1769.pd

New hosts of Bactrocera carambolae (Diptera: Tephritidae) in Brazil.

Seven plant species are reported for the first time as hosts of Bactrocera carambolae in Brazil. Eugenia stipitata and Pouteria macrophylla, native to the Amazon region, have already been reported as hosts of the carambola fruit fly. The largest number of specimens was obtained from fruits of Averrhoa carambola and Psidium guajava

Indução de brotos in vitro de Sclerolobium paniculatum Vogel em diferentes concentrações de Benzilaminopurina.

O Sclerolobium paniculatum Vogel, conhecida vulgarmente por tachi-branco é uma espécie nativa de terra firme da região amazônica pertencente à família Fabaceae, subfamília Caesalpinoideae. O tachi-branco é uma leguminosa arbórea nativa da Amazônia brasileira, ocorrendo em diferentes tipos de solos, com rápido crescimento e elevada produção de folhas e ramos. O objetivo deste trabalho foi avaliar o efeito de diferentes concentrações de BAP sobre a capacidade de proliferação de brotos in vitro de Sclerolobium paniculatum Vogel. O trabalho foi conduzido no Laboratório de Biotecnologia e Recursos Genéticos da Embrapa Amazônia Oriental, Belém-PA. Para a multiplicação, as plântulas obtidas através de germinação in vitro, foram submetidas a três tratamentos com diferentes concentrações de BAP (1,0; 2,5 e 10,0 mg.L-1) e três repetições. Os resultados permitiram observar que não houve diferença significativa na emissão de brotos de Sclerolobium paniculatum Vogel tanto no primeiro quanto no segundo subcultivo através do teste de Tukey em nível de 5% de probabilidade.PIBIC-2011

Determinação de formas inorgânicas de nitrogênio por análise em fluxo.

bitstream/item/37363/1/Boletim01.pd