6,052 research outputs found
Polymer multimode waveguide optical and electronic PCB manufacturing
No full textThe paper describes the research in the £1.3 million IeMRC Integrated Optical and Electronic Interconnect PCB Manufacturing (OPCB) Flagship Project in which 8 companies and 3 universities carry out collaborative research and which was formed and is technically led by the author. The consortium’s research is aimed at investigating a range of fabrication techniques, some established and some novel, for fabricating polymer multimode waveguides from several polymers, some formulations of which are being developed within the project. The challenge is to develop low cost waveguide manufacturing techniques compatible with commercial PCB manufacturing and to reduce their alignment cost. The project aims to take the first steps in making this hybrid optical waveguide and electrical copper track printed circuit board disruptive technology widely available by establishing and incorporating waveguide design rules into commercial PCB layout software and transferring the technology for fabricating such boards to a commercial PCB manufacturer. To focus the research the project is designing an optical waveguide backplane to tight realistic constraints, using commercial layout software with the new optical design rules, for a demonstrator into which 4 daughter cards are plugged, each carrying an aggregate of 80 Gb/s data so that each waveguide carries 10 Gb/s
Golda Strümpfe D.R. Patent ein ideales Tragen, Kornsand & Co Frankfurt a. M.
No full textGOLDA STRÜMPFE D.R. PATENT EIN IDEALES TRAGEN, KORNSAND & CO FRANKFURT A. M.
Golda Strümpfe D.R. Patent ein ideales Tragen, Kornsand & Co Frankfurt a. M. ( -
Golda Strümpfe, D.R. Patent, halten tadellos, Kornsand & Co Frankfurt a. M.
No full textGOLDA STRÜMPFE, D.R. PATENT, HALTEN TADELLOS, KORNSAND & CO FRANKFURT A. M.
Golda Strümpfe, D.R. Patent, halten tadellos, Kornsand & Co Frankfurt a. M. ( -
Marke Golda mit der Einlage vom Guten das Beste, D.R. Patent, Kornsand & Co. Frankfurt
No full textMARKE GOLDA MIT DER EINLAGE VOM GUTEN DAS BESTE, D.R. PATENT, KORNSAND & CO. FRANKFURT
Marke Golda mit der Einlage vom Guten das Beste, D.R. Patent, Kornsand & Co. Frankfurt ( -
Golda, Strümpfe mit der Einlage, D.R. Patent sind unbedingt haltbar, Kornsand & Co Frankfurt a. M., Schutzmarke
No full textGOLDA, STRÜMPFE MIT DER EINLAGE, D.R. PATENT SIND UNBEDINGT HALTBAR, KORNSAND & CO FRANKFURT A. M., SCHUTZMARKE
Golda, Strümpfe mit der Einlage, D.R. Patent sind unbedingt haltbar, Kornsand & Co Frankfurt a. M., Schutzmarke ( -
The Chance and Probability Concepts Project
No full textThis article, created by D.R. Green, describes an investigation of what concepts and intuitions concerning random processes are present in the minds of children of varying abilities across the 11-16 age range. The ability to list permutations, combinations and arrangements is also being investigated. The author states, "Over the past two decades the topic of 'Probabilityâ has been brought into the mathematics curriculum but it may be that this is more an empty gesture rather than a sound strategy." This article can help to alleviate many of the struggles in teaching probability concepts. The article is pitched at a more elementary audience, but is still a perfect resource for almost anyone teaching in the field
Achieving 10 ps coincidence time resolution in TOF-PET is an impossible dream
No full textGreen Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.RST/Radiation, Science and TechnologyRST/Medical Physics & Technolog
Grad's 13 moments approximation for Enskog-Vlasov equation
No full textHydrodynamic models of liquid-vapor flows have to face the difficulty of describing non-equilibrium regions next to interfaces. Depending on the flow regimes and the underlying theoretical models, different answers have been given. In particular, diffuse interface models (DIMs) provide, in principle, a unified description of the whole flow field by a set of PDE's, not much more complex than Navier-Stokes-Fourier classical equations. Unfortunately, DIMs fail to provide a proper description of kinetic layers next to interfaces. In order to develop a model incorporating kinetic effects while keeping the relative simplicity of DIMs, macroscopic transport equations-moment equations- A re derived from the Enskog-Vlasov equation. The Enskog-Vlasov equation extends the Enskog equation by accounting for the attractive forces between the gas molecules. Hence, it gives a van-der-Waals-like kinetic description of a non-ideal gas, including liquid-vapor phase change. Specifically, the equation describes the liquid phase, the vapor phase, and a diffusive transition region connecting both phases. While not the most accurate model, solutions of the Enskog-Vlasov equation exhibits all relevant phenomena occurring in the evaporation and condensation of rarefied or dense vapors. In this work, Grad's moment method is used to derive a closed set of 13 moment equations. In the appropriate limits, these reduce to the Navier-Stokes-Fourier system for liquid and vapor. Our main interest is to study non-hydrodynamic effects, in particular transport in and across the transition region, and the interplay between the transition region and Knudsen layers. We present first results of this program, including the closed transport equations for 13 moments, discussion of the limits, and solutions in simple geometries
A kinetic model for evaporation of a simple fluid from nanopores
No full textEvaporating/condensating flows involving liquids wetting nanopores are at the basis of both biological and artificial processes. Contrary to the dynamics of a vapor in contact with a free liquid surface, evaporation/condensation from/to surfaces is strongly affected by the interaction of the liquid-vapor system with the walls. The latter shows up by modifying the equilibrium saturated vapor pressure not only through the curvature of the liquid menisci filling the nanopores but also changing the properties of the liquid-vapor system when the two phases are in the vicinity of the walls. The aim of the present study is the investigation of the phase change behaviour of a simple fluid, wetting a planar wall hosting a periodic array of equispaced nanopores
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