Emotional Maturity

Hogg Foundation for Mental Healt

Coherent inverse Compton scattering with attosecond electron bunches accelerated and compressed by radially polarized laser pulses

We present a study of direct laser driven electron acceleration and scaling of attosecond bunch compression in unbound vacuum. Simple analytical expressions and detailed three-dimensional numerical calculations including space charge reveal the conditions for compression to attosecond electron sheets. Intermediate emittance minima suitable for brilliant x-ray generation via coherent inverse Compton scattering (ICS) are predicted. We verify the coherent emission properties of the resulting x-ray fields and demonstrate feasability for realistic laser parameters.Comment: 4 pages, 4 figure

Effects of the internet on the spatial structure of innovation networks

Research on innovation systems and innovative milieux has shown that the innovation process of companies is strongly interrelated with other firms and organisations. Internet is a new information and communication technology with a considerable potential to change such relationships and networks. An often held expectation is that the Internet will allow firms to interact with distant partners more easily and that as a consequence innovation networks become independent from geographical space. A contrasting view argues that local and regional networks and innovation systems will keep their importance, due to the fact that tacit knowledge, face to face communication and institutional factors are still of key relevance. In the paper we are going to investigate to which extent and how the Internet changes innovation network of companies. Do firms using the Internet intensively have other innovation partners at wider spatial scales than firms which hardly use this communication technology? We have analysed the effects of the Internet on the innovation-related knowledge flows of firms by conducting a telephone survey, personal interviews and a WWW-survey of Austrian firms. Preliminary analysis shows that there is significant variance between firms depending on the relative importance of different types of knowledge communicated and the type of firm (e.g., science-based firms versus traditional manufacturing firms). Overall, there is evidence that the Internet made relations to innovation partners more efficient. However, the configuration of networks (types and location of partners) did not change as much as is often expected in the literature.

Process modelling for materials preparation experiments

The main goals of the research under this grant consist of the development of mathematical tools and measurement of transport properties necessary for high fidelity modeling of crystal growth from the melt and solution, in particular, for the Bridgman-Stockbarger growth of mercury cadmium telluride (MCT) and the solution growth of triglycine sulphate (TGS). Of the tasks described in detail in the original proposal, two remain to be worked on: (1) development of a spectral code for moving boundary problems; and (2) diffusivity measurements on concentrated and supersaturated TGS solutions. Progress made during this seventh half-year period is reported

Compressive Nonparametric Graphical Model Selection For Time Series

We propose a method for inferring the conditional indepen- dence graph (CIG) of a high-dimensional discrete-time Gaus- sian vector random process from finite-length observations. Our approach does not rely on a parametric model (such as, e.g., an autoregressive model) for the vector random process; rather, it only assumes certain spectral smoothness proper- ties. The proposed inference scheme is compressive in that it works for sample sizes that are (much) smaller than the number of scalar process components. We provide analytical conditions for our method to correctly identify the CIG with high probability.Comment: to appear in Proc. IEEE ICASSP 201