1,721,038 research outputs found
Spin dependent electron absorption in Fe(001)-p(1x1)O: A new candidate for a stable and efficient electron polarization analyzer
No full textImpact of semiconducting electrodes on the electroresistance of ferroelectric tunnel junctions
Full text linkFerroelectric tunnel junctions are promising candidates for the realization of energy-efficient digital memories and analog memcomputing devices. In this work, we investigate the impact of a semiconducting layer in series to the junction on the sign of electroresistance. To this scope, we compare tunnel junctions fabricated out of Pt/BaTiO3/La1/3Sr2/3MnO3 (LSMO) and Pt/BaTiO3/Nb:SrTiO3 (Nb:STO) heterostructures, displaying an opposite sign of the electroresistance. By
capacitance-voltage profiling, we observe a behavior typical of Metal-Oxide-Semiconductor tunnel devices in both cases but compatible with the opposite sign of charge carriers in the semiconducting layer. While Nb:STO displays the expected n-type semiconducting character, metallic LSMO develops an interfacial p-type semiconducting layer. The different types of carriers at the semiconducting
interfaces and the modulation of the depleted region by the ferroelectric charge have
a deep impact on electroresistance, possibly accounting for the different sign observed in the two systems
Dispositivo e metodo per la quantificazione di componenti corpuscolate e non corpuscolate del sangue
No full textLa presente invenzione riguarda un dispositivo e relativo metodo per la quantificazione, di componenti corpuscolate e non corpuscolate presenti in una soluzione contenente un campione di sangue, mediante la concentrazione e separazione magnetoforetica delle componenti di interesse dal resto del campione e la rivelazione impedenziometrica della quantità di tali componenti
Impact of magnetic domains on magnetic flux concentrators
No full textThe impact of magnetic domains in magnetic flux concentrators is studied using the simulation software MuMax3. First, the simulation parameters are validated using experimental results from magnetic force microscopy; second the simulation output is benchmarked with the one obtained using Comsol Multiphysics. Finally, the impact of magnetic domain is assessed, showing how micromagnetic effects can become relevant, if not dominant, when scaling the gap between the MFC and the sensor
MEMS Magnetometer Using Magnetic Flux Concentrators and Permanent Magnets
Full text linkA novel frequency modulated MEMS magnetometer is presented. The new device is inspired by the magnetic force microscopy technique, it combines standard MEMS technology with magnetic elements to obtain a magnetometer with potential for low power consumption and high performance. The analytical model and the characterization of the first proof-concept device are presented
Dispositivo opto-magnetico sensore e sistema di riconoscimento molecolare
No full textLa presente invenzione affronta il problema di proporre una tecnica di riconoscimento molecolare basata su di un sensore ottico che consenta di ridurre l’effetto di fenomeni spuri (ad esempio variazioni di temperatura, parziale evaporazione del campione, variazioni dell’accoppiamento ottico, instabilità meccaniche) rispetto a quanto accade secondo l’arte nota.
In particolare, la presente invenzione ha per oggetto un dispositivo opto-magnetico come definito dalla rivendicazione 1 e da sue forme di realizzazioni preferenziali come definite dalle rivendicazioni 2-8.
Forma oggetto della presente invenzione anche un sistema di riconoscimento di un analita come descritto dalla rivendicazione 9 e da sue forme di realizzazione particolari definite dalle rivendicazioni 10-16
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
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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