1,720,967 research outputs found
Wireless Sensor for Precision Grasping of Objects and Tools by Robotic Hands
No full textA preliminary study for a novel approach of detecting the orientation of a robotic hand with respect to non-metallic objects is illustrated. This goal is pursued by using a radiofrequency (RF) probe on the robotic hand and a printed resonator on the tagged item. In order to detect the hand orientation with respect to the target, the real part of the probe input impedance is examined for different angular orientations of the resonator placed on the object. The relation relating the oriented angle between the reader and the sensor to the impedance is addressed to define a proper calibration curve. A half wavelength dipole antenna as a probe on the hand and a metal strip (dipole resonator) placed on the object is employed. The sensing is performed within a near range distance from the object. As the result, it is observed that he proposed probe-resonator configuration allows the identification of the relative angular position of the hand with respect to the object with an encouraging level of accuracy
Fem and analytical modeling of the incipient chip formation for the generation of micro-features
Full text linkThis paper explores the modeling of incipient cutting by Abaqus, LS-Dyna, and Ansys Finite Element Methods (FEMs), by comparing also experimentally the results on different material classes, including common aluminum and steel alloys and an acetal polymer. The target application is the sustainable manufacturing of gecko adhesives by micromachining a durable mold for injection molding. The challenges posed by the mold shape include undercuts and sharp tips, which can be machined by a special diamond blade, which enters the material, forms a chip, and exits. An analytical model to predict the shape of the incipient chip and of the formed grove as a function of the material properties and of the cutting parameters is provided. The main scientific merit of the current work is to approach theoretically, numerically, and experimentally the very early phase of the cutting tool penetration for new sustainable machining and micro-machining processes
Additive Manufacturing Technologies for Wireless Anti-Counterfeiting Solutions
No full textAdditive manufacturing processes, both bi-dimensional as well as three-dimensional ones, provide unparalleled degrees of freedom with respect to formative and subtractive approaches. This feature, together with a high level of customization, can be exploited for the design of innovative radio frequency solutions, including devices for identification and sensing. An interesting application is represented by the use of additive manufacturing for realizing an additional level of security implemented at physical layer
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
Additive Manufacturing Exploitation for Wireless Sensing and Radio Frequency Identification
No full textAdditive manufacturing includes a vast landscape of different technologies, both 2D and 3D as well as hybrid ones, which provide great flexibility and customization to the designer. Although most of the mature applications that exploit this paradigm takes advantage of the control of mechanical properties of the fabricated objects, additive manufacturing has been recently adopted also for electromagnetic design of innovative identification and sensing devices. This work focuses on the ongoing research activities carried out at the Additive Manufacturing Crosslab of the University of Pisa as tangible proof of the great potential offered by these technologies
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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