RF performance of GaAs/Si/Si MESFETs for MIMICs

It is shown that an intermediate Si epitaxial layer in the GaAs on Silicon system is critical for attaining state of the art MESFET microwave performance. Devices with gate length of 1.3um and width 180um showed unit current gain cutoff frequency (ft) up to 18GHz and maximum power gain cutoff frequency (fmax) of about 30GHz. These results indicate that MMICs can be developed on GaAs/Si/Si wafers with a processing technology suitable for GaAs-Si monolithic integration. The critical requirements for MMICs on Si are also presented

Experience from testbeds and management platforms towards mesh networking with heterogeneous wireless access

The MESH-WISE project is aiming to address key fundamental issues in wireless mesh networking that span from fundamental performance characterization to prototyping heterogeneous-access mesh networking solutions for emergency response scenarios. In this paper we present the infrastructures that will be leveraged in this project and the latest results that have been acquired from the ones that are deployed. We further discuss the state of the art in academic and industrial resource and network management platforms and discuss how we will use existing know-how towards a centralized solution

Micro-CTvlab: A web based virtual gallery of biological specimens using X-ray microtomography (micro-CT)

During recent years, X-ray microtomography (micro-CT) has seen an increasing use in biological research areas, such as functional morphology, taxonomy, evolutionary biology and developmental research. Micro-CT is a technology which uses X-rays to create sub-micron resolution images of external and internal features of specimens. These images can then be rendered in a three-dimensional space and used for qualitative and quantitative 3D analyses. However, the online exploration and dissemination of micro-CT datasets are rarely made available to the public due to their large size and a lack of dedicated online platforms for the interactive manipulation of 3D data. Here, the development of a virtual micro-CT laboratory (Micro-CTvlab) is described, which can be used by everyone who is interested in digitisation methods and biological collections and aims at making the micro-CT data exploration of natural history specimens freely available over the internet. The Micro-CTvlab offers to the user virtual image galleries of various taxa which can be displayed and downloaded through a web application. With a few clicks, accurate, detailed and three-dimensional models of species can be studied and virtually dissected without destroying the actual specimen. The data and functions of the Micro-CTvlab can be accessed either on a normal computer or through a dedicated version for mobile devices