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Transient XUV core level spectroscopy is used to resolve photoexcited electron and hole distributions, as well as carrier-phonon and phonon-phonon scattering times, in the γ, L, and X valleys of silicon.
Attosecond transient reflectivity is developed to observe the photoexcitation dynamics in germanium. Attosecond time-resolved measurements of the dielectric function reveal a few-femtosecond collective electronic response time, which renormalizes the Coulomb interaction between the excited carriers.
The repair of high value turbine blades of aero engines yields the opportunity of saving cost and to reduce the environmental impact of aviation [1]. The vital part of the repair process is the estimation of the part's condition. Based on product regeneration processes the precise geometry measurement and sensitive damage detection on the turbine blades contribute to the restoration of aerodynamically...
We present improvements in RF microelectromechanical switch design and fabrication that demonstrated improved lifetimes in cycled switches. First, implementation of – contact metallurgy into an existing design showed improved switch lifetime over switches with Pt-Au, Ir-Au, and Au-Au contacts. Second, the switch design was changed to reduce impact upon switch closure, and the...
The vision of cross-domain file systems is becoming a reality; however, issues like ensuring quality of service for bandwidth-intense resource access, especially over mobile network, may still arise. In this paper, we propose a cross-domain shared file system, which enables a real-time experience for delivery of virtualized file systems utilizing a grid approach over NGN. The system allows users to...
The convergence between grid environments and QoS-enabled networks, in particular in the context of next generation networks (NGN), gained research interest in the direction of combining NGN capabilities and IT assets for the creation of future services. Following the ETSI NGN grid standardization activities, this work proposes an OGSA standard compliant NGN grid subsystem architecture to act as a...
Parameters of conical emission are defined with respect to ambient gas, pulse-width and wavelength of focused radiation, which allows significant minimization of scattering in the case of ultra-short pulsed laser micromachining.
The application of Taylor series has become a standard concept in numerical analysis. Their ability of approximating functions arbitrarily close under certain conditions makes them an ideal tool for the integration of differential equations. Before the appearance of digital computers the analytical determination of Taylor series coefficients, i.e. the calculation of higher derivatives, was regarded...
We present the formation of InAs quantum dots with a low density on AlGaInAs surfaces lattice-matched to InP(001)-substrates using solid source molecular beam epitaxy. By using very low growth rates and an InAs coverage of 2 to 2.6 monolayers the formation of quantum dots is favoured compared to the formation of quantum dashes. The emission wavelength of the single quantum dots could be varied in...
Methods of numerical solutions of differential equations have been studied since the end of the last century. A large number of integration formulas have been published especially for solving special systems of differential equations. In general, it was not possible to choose the best method but for a subclass of tasks defined by similar properties the most suitable method could always be found. The...
It is the aim of the paper to give some of the basic philosophy of analogue computation before entering into a detailed discussion of the theory of analogue principles. The analogue technique has, in general, three control states; they are the reset, operate, and hold states. The idea of analogue principles is used in our Taylor series integrators. Again, three control states are applied (reset, operate,...
Homogeneous differential equations with constant coefficients are analysed in the paper to show how extremely high accuracy and speed of computations can be obtained using Taylor series for numerical solutions of differential equations. Two examples of homogeneous differential equations and their solutions by the modern Taylor series method will be analysed in this paper. The main idea behind the...
The paper deals with semi-analytical computations and gives the examples of absolutely exact solutions that can be obtained using numerical solutions of differential equations. Numerical solutions of differential equations based on the Taylor series are implemented in a simulation language TKSL. Polynomials functions, finite integrals, Fourier series and exponential functions are but a few examples...
The simulation language TKSL and modern Taylor series method has proved to be very powerful computing tools for extremely exact, stable and fast numerical solutions of systems of differential equations. In a natural way, TKSL also involves solutions of problems that can be reduced to solving a system of differential equations. It is known that the Taylor series method is a parallel one and therefore...
Direct volume rendering of large volumetric data sets on programmable graphics hardware is often limited by the amount of available graphics memory and the bandwidth from main memory to graphics memory. Therefore, several approaches to volume rendering from compact representations of volumetric data have been published that avoid most of the data transfer between main memory and the graphics programming...
We present the first implementation of a volume ray casting algorithm for tetrahedral meshes running on off-the-shelf programmable graphics hardware. Our implementation avoids the memory transfer bottleneck of the graphics bus since the complete mesh data is stored in the local memory of the graphics adapter and all computations, in particular ray traversal and ray integration, are performed by the...
We present the first algorithm that employs hardware-accelerated cell-projection for direct volume rendering of cyclic meshes, i.e., meshes with visibility cycles. The visibility sorting of a cyclic mesh is performed by an extended topological sorting, which computes and isolates visibility cycles. Measured sorting times are comparable to previously published algorithms, which are, however, restricted...
We present two beneficial rendering extensions to the projected tetrahedra (PT) algorithm proposed by Shirley and Tuchman (1990). These extensions are compatible with any cell sorting technique, for example the BSP-XMPVO sorting algorithm for unstructured meshes. Using 3D texture mapping our first extension solves the longstanding problem of hardware-accelerated but accurate rendering of tetrahedral...
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