1,721,335 research outputs found
Influence of lossy finite width image planes on PCB radiation
No full textThe radiation from a printed circuit board (PCB) is one of the critical problems regarding the design and functioning of VLSI electronic devices. This work deals with the influence of two finite width, finite thickness, not perfectly conductive image planes on the radiation from a trace placed between them. The effects of the surface currents on both sides of each plane are taken into account. The radiated emission of this structure has been calculated by solving a set of Electric Field Integral Equations by the Method of Moments. The current distributions on the image planes as functions of various parameters are analyzed to have a guidance to an optimal design. The radiation patterns in different configurations of the image planes are also considered. The diffusion of the electromagnetic field through the finite thickness of the boards is modelled and its influence discussed
Compressed collections for simulated crawling
No full textCollections are a fundamental tool for reproducible evaluation of information retrieval techniques. We describe a new method for distributing the document lengths and term counts (a.k.a. within-document frequencies) of a web snapshot in a highly compressed and nonetheless quickly accessible form. Our main application is reproducibility of the behaviour of focused crawlers: by coupling our collection with the corresponding web graph compressed with WebGraph we make it possible to apply text-based machine learning tools to the collection, while keeping the data set footprint small. Finally, we describe a collection based on a crawl of 100Mpages of the .uk domain, publicly available in bundle with a Java open-source implementation of our techniques
Archive4J 1.0
No full textArchive4J is a Java framework to store a direct index in highly compressed form
Efficient modeling of transmission line networks discontinuities
No full textA hybrid approach is proposed for the accurate modeling of discontinuities frequently encountered in transmission line networks (e.g. printed circuit boards). A frequency domain method of moments formulation for the discontinuities is introduced and merged into a transmission line based approach for the analysis of complex networks. Suitable equations, in terms of convolution integrals, are developed to join both formulations in the time domain in order to account for the presence of nonlinear loads. An efficient finite difference time domain algorithm is used to solve the resulting integrodifferential equation syste
Sistemi e politiche sociali regionali: 5 casi a confronto
No full textLe regioni hanno assetti istituzionali erogativi e di finanziamento differenziati nel settore sociale e socio sanitario. Il capitolo confronta al proposito 5 region
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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