1,046 research outputs found
Diffraction modelling of mobile radio wave propagation in built-up areas
No full textThis thesis was submitted for the degree of Doctor of Philosophy and awarded by Brunel University.This thesis examines theoretical methods of modelling radio wave propagation in built-up areas, with particular application to mobile radio systems Theoretical approaches allow precise quantitative description of the environment in terms of parameters such as mean building heights and densities, in contrast to the ambiguous nature of more conventional empirical models. The models are constructed using both scalar and vector field analysis techniques. The vector analysis is accomplished using the Geometrical Theory of Diffraction to describe the detailed effects of building shape and positioning, particularly for short-range situations. Over longer ranges propagation can often be described in terms of multiple edge diffraction over building rooftops using a scalar field representation. This mechanism accounts well for measured field strength variations, but is time consuming to calculate accurately using standard methods. A rapid algorithm for calculating scalar diffraction over multiple building edges with arbitrary positioning is constructed. This model can be used for deterministic prediction of sector median field strengths including slow fading variations when appropriate building data exists. It is also applicable to terrain diffraction problems. For the case when only average building parameters are available a closed form solution to the problem of multiple diffraction over buildings of equal heights and spacings is derived. The solution is applicable to any antenna heights and so provides a rapid and efficient way to predict gross propagation characteristics. Both models are tested against measurements made in the UHF band and are found to yield good prediction accuracy.This work is funded by the Science and Engineering Research Council under award number 889088999 and by Philips Radio Communication Systems Ltd. of Cambridge under an industrial studentship
F.R. TOMLINSON: MENS EN WETENSKAPLIKE
No full textThe 1996 F.R. Tomlinson Memorial Lecture was delivered on 23rd May 1996 in Bloemfontein. The author, Prof D.J.G. Smith, chose the subject : F.R. Tomlinson: Man and ScientistTeaching/Communication/Extension/Profession,
F.R. Falconer's House
No full textPhotograph - A man in the backyard of F.R. Falconer's house, Athabasca, Alberta. Across the lane is the nurse's residence, later owned by Mrs. Dan Bilid
Forms of judaism in writings of F.R. Kraus, František Kafka, Hana Bělohradská and J.R. Pick
No full textTéma této práce zní Podoby židovství v dílech F.R. Krause, Františka Kafky, Hany Bělohradské a J.R. Picka. Soustředila jsem se na méně známé české autory, kteří se ve své tvorbě věnovali tématu židovství. Jedná se o texty související s 2. světovou válkou. V úvodu je nastíněn stručný přehled o působení Židů na našem území, následuje představení zvolené čtveřice autorů. Hlavním cílem bylo přiblížit a rozebrat vybraná díla a v závěru shrnout jejich odlišné a podobné znaky. Současně byly tyto texty zařazeny do kontextu české prózy s tematikou okupace.Katedra českého jazyka a literaturyObhájenoThe theme of this bachelor work is called Forms of judaism in writings of F.R. Kraus, František Kafka, Hana Bělohradská and J.R. Pick. In this thesis the author tried to concentrate on a few less-known Czech writers, who devoted their writing to the fate of Jews during the Second World War. In the first part of this work the author outlined the influence of the Jewish etnic group on the population of our country, with the aim to gain orientation in the historical backgound of that time. Next the author analysed the texts of selected books with the Jewish theme from different points of view and in the end of her work compared the books she used. In the closing of this work there is a contextual classification of the mentioned books into the category of works with the topic of occupation, from the end of the Second World War until today
Placental IGF2 expression in normal and intrauterine growth restricted (IUGR) pregnancies
No full textMechanical properties of cancellous bone from the acetabulum in relation to acetabular shell fixation and compared with the corresponding femoral head
No full textAcknowledgments We thank Phil Jackson for help sourcing donated cadavers and transportation of samples and Dr. F.R. Saunders for help with core preparation and advice. Funding This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.Peer reviewe
Organization of shallow cumulus clouds
No full textHPCI User Report for the project Organization of shallow cumulus clouds on the Fugaku supercomputer.Green 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.Atmospheric Remote Sensin
Clipping about F.R. Bernard, 12 October 1911
No full texthttps://egrove.olemiss.edu/bernard/1062/thumbnail.jp
Committee to F.R. Bernard, 2 August 1892
No full texthttps://egrove.olemiss.edu/bernard/1063/thumbnail.jp
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