1,721,180 research outputs found
Some uniaxial piezoresistive effects in p-type silicon
No full textSome experimental results obtained at 300 K and 77 are presented regardind the silicon crystal doped with boron
Sensori termoresistivi:un po' di fisica e tanta fantasia
No full textViene descritto l'effetto termoresistivo e considerato il suo impiego nell'area dei sensori. Sono descritti inoltre i materiali e le tecniche di realizzazione di realizzaione di sensori insieme con esempi di dispositivi per la misura di temperatura, flusso e controllo di grandezze elettriche e fisiche
Strain sensitivity in film and cermet resistors: measured and physical quantities
No full textThe strain coefficient of resistivity of resistors deposited on a substrate is analysed, and an expression for its correlation to the measurable longitudinal and transverse gauge factors is given for isotropic (metal, amorphous semiconductor and cermet) resistors. The use of this expression for the evaluation of other physical quantities is exemplified by the calculation of the temperature coefficients of resistivity for resistors on substrates of different thermal expansivity
Trasduttori di pressione ad effetto piezoresistivo: vent'anni di ricerca verso l'applicazione industriale
No full textViene descritto l'effetto di piezoresistenza in metalli e semiconduttori. E' presentata la struttutura di un sensore di pressione e descritti l'elemento sensibile e di trasduzione. Oltre alla tecnologia costruttiva è presentata il principio operativo per sensori basati elementi sensibili metallici e a semiconduttore. E' infine presentata l'evoluzione di tecnologie realizzative dei sensori di pressione verso l'applicazione industriale
Modulo inclinometrico per misure fino a 360° ad elevata risoluzione e bassa deriva termica
No full text
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
Characterization of thick-film resistor strain gauges on enamel steel
No full textRecently it has been shown that thick-film resistor starin gauges on ceramic sub strates exhibit noticeable piezoresistive effects, which allow one to develop highly-resistive, low-cost mechanical transducers. In this paper piezoresistive effects in thick-film resistive systems for enameled steel are analyzed and it is shown that they are as interesting for such applications thancks to they high strain sensitivity, low temperature coefficient of resistance and of gauge factors, low excess noise and high stability. Moreover the elastic properties of the substrate enable one to strain the resistors at more than 1000 microstrain with linear and reproducible characteristics
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
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
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