1,721,029 research outputs found
Investigation of a 100 μm Magnetic Wire for Temperature Sensing based on a Time Domain Readout
No full textIn this paper we present an analysis of temperature response of a 100 μm hysteretic wire exploiting a time domain readout. The ferromagnetic wire is composed of 80% Co-Fe, 20% Si, B. The study here conducted investigates the effect of temperature in the microwire with an output measured as time response, which represents an intriguing method to convert the target quantity. The experiments have been accomplished by using a MuMetal® electromagnetic shield with controlled temperature and an acquisition system to process the output. Results here reported evince the suitability of the proposed method which arouses interest for several interesting applications
Exploitation of Temperature Effect in 100 μm Ferromagnetic Wire
No full textIn this paper we present a characterization of a ferromagnetic microwire having a diameter of about 100 μm and a composition of CoFeSiB as 80% Co-Fe, 20% Si, B. We experimentally analyze the influence of the temperature and excitation frequencies on the hysteresis loop of the material. In particular, results and discussion about how the temperature can affect the magnetic characteristic of the material are provided. All measurements have been performed under controlled conditions. A suitable setup has been conceived, realized and an experimental campaign with the characterization of the microwire has been accomplished obtaining very promising results
Conception of a Temperature Sensor Based on 100-μm CoFeSiB Ferromagnetic Wire
No full textIn this article, we present the conception of a temperature sensor based on a ferromagnetic microwire having a diameter of about 100~mu ext{m} and a composition of CoFeSiB as 80% Co-Fe and 20% Si-B. We experimentally analyze the influence of the temperature and excitation frequencies on the hysteresis loop of the material. Discussion about how the temperature can act as a measurand through the analysis of the output of the sensor is carried out. Temperature is correlated with the magnetic characteristic of the material, and the results are addressed in light of the recent literature and of the Ising model. All measurements were performed under controlled conditions. An ad hoc setup was developed, and an experimental analysis was carried out to characterize the microwire temperature sensor
Development of hybrid SOI-based micro-gravimetric sensors
No full textA hybrid system consisting of a resonant piezo layer (RPL) and a resonant SOI micromechanical sensor is conceived in this work as highly sensitive gravimetric sensor for applications in various fields. The idea consists in using PZT screen-printed elements, behaving as thickness-mode resonators, coupled to a micromechanical resonator based on a SOI technology. The PZT resonator induces oscillations to the micromechanical device and, if the resonance condition is matched for this latter system, a sensitivity of 5000 Hz/μg can be obtained when a variation of the proof mass occurs. Prototypes of both the mentioned two constitutive parts have been separately realized by the authors showing potentials for batch production. Several different experimental MEMS prototypes, mainly made by a central proof-mass sustained by four compliant beams anchored to its four corners, have been realized. Both Front Side and Back Side DRIE etching procedures have been performed improving the proof mass value with respect to a different set of prototypes realized by using a standard CMOS technology. Even if a low resonance frequency characterize the realized micro-prototypes a drastically improved value of the quality factor allow to obtain very high gravimetric sensitivity then to detect very small changes in the proof mass value due i.e. to chemical or physical compound absorption over the mass surface. Electrical or optical sensing can be adopted, depending on materials embedded into the considered device, as already demonstrated by the authors. Polysilicon strain gauges have been embedded into the springs while optical readout can be addressed by using a novel class of metal-dielectric photonic-band gap materials. In this latter case a process step, which consists of depositing suitable thin films, must be take into account
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
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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