Ab initio methods are used for investigating structural and electronic properties of silicon−carbon nanotubes (SiCNTs). Tubes with different
Si to C ratios were tested and the trend from C-rich to Si-rich SiCNTs is examined. Our results show that SiCNTs lose stability when the ratio
of Si over C increases. Nevertheless they remain stable until the ratio reaches 50:50, and after that the Si-rich tubes collapse to nanowires
or clusters with solid interiors. The electronic density of states of different SiCNTs is also presented and analyzed.
Cloud computing provides cost-efficient opportunities for enterprises by offering a variety of dynamic, scalable, and shared services. Usually, cloud providers provide assurances by specifying technical and functional descriptions in Service Level Agreements (SLAs) for the services they offer. The descriptions in SLAs are not consistent among the cloud providers even though they offer services with similar functionality. Therefore, customers are not sure whether they can identify a trustworthy cloud provider only based on its SLA. To support the customers in reliably identifying trustworthy cloud providers, we propose a multi-faceted Trust Management (TM) system architecture for a cloud computing marketplace. This system provides means to identify the trustworthy cloud providers in terms of different attributes (e.g., security, performance, compliance) assessed by multiple sources and roots of trust information.
Cloud Computing is an emerging computing paradigm. It shares massively scalable, elastic resources (e.g., data, calculations, and services) transparently among the users over a massive network. The Cloud market is growing rapidly and bringing up numerous research challenges. This paper provides a landscape of Cloud Computing and its research challenges, especially considering the areas of service selection, quality assurance of Cloud services, and trust establishment in Cloud environments. As the latter is known to be one of the major challenges of Cloud Computing, We also provide an overview of the important aspects that need to be considered when integrating trust and reputation concepts into Cloud Computing.
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