1,354,801 research outputs found
Wireless multi-sensor gas platform for environmental monitoring
No full textAir quality control is a monitoring task of high priority in the scope of Smart City and Smart Home applications. In fact, a number of sensors are required to successfully detect the leaks of various gases and their different concentrations. In this work, we present an autonomous multisensory wireless platform which includes both analog and digital gas sensors for environmental monitoring. The platform includes four measurement circuits with sensors of different types: one for analog catalytic/semiconductor gas sensor, two for analog electrochemical gas sensors and one for a gas sensor with digital data transmission interface. The platform ensures low power consumption and can operate either as a separate monitoring sensor node or as a part of wireless sensor network
La construcción de la recta tangente en puntos de inflexión: un método alternativo en la articulación de saberes
No full textEn trabajos anteriores (Karelin, O., Rondero, C., Tarasenko, A., 2004, 2005 y 2006), se propuso un método alternativo en la búsqueda de la recta tangente para funciones elementales sin el uso de la derivada y donde se demostraron algunas de sus principales propiedades. Por medio de una función adicional, F(x) = f(x) – (m x + b), se identifican relaciones entre los puntos extremos de ésta función y los puntos de tangencia de la función original f(x) . Todos los resultados previos fueron obtenidos para funciones cóncavas. En este trabajo, se discute una ampliación del método que posibilita incluir el caso del cálculo de la recta tangente en los puntos de inflexión de la función f(x)
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe 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
No full text“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
No full textWe 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
Improving interoperability of catalytic sensors
No full textA huge number of combustible gas leaks occur every year at industrial and home facilities. These leaks may have grave consequences for health, environment and property. In this work we demonstrate the approach for improving the interoperability of catalytic sensors which are widely used in industrial monitoring applications for combustible gas leaks. To ensure methane detection within the broad concentration range (100 ppm–100% vol.), we propose using of two sensors with catalysts in the modified Wheatstone sensing circuit and to cover them with sealed caps with different holes to enable gas diffusion control
On singular integral operators with linear-fractional involutions
No full textWe denote the Cauchy singular integral operator along a contour by and the identity operator by . In the paper [1,2] we constructed a similarity transformation %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %\begin{equation}\label{opeq T} \ % \vspace{-3mm} %\end{equation}\\ %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% between the singular integral operators with the rotation operator through the angle on the unit circle , acting on the space , and a certain matrix characteristic singular integral operator without shifts acting on the space . For , we have %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% \begin{displaymath}%\label{aISW} A = a_{0}I_{\Bbb T} \!+\! b_{0}S_{\Bbb T}\! +\! a_{1}W_{\Bbb T}\! +\! b_{1}S_{\Bbb T}W_{\Bbb T},\quad A\in [L_2(\Bbb T)],D=uI_{\Bbb T}+vS_{{\Bbb T}},\quad D\in [L_2^2(\Bbb T)]. \end{displaymath} %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% In the same papers acting by invertible operators from the right hand and left-hand side we reduced \begin{displaymath}%\label{aISQ} B_{\Bbb R}=aI_{\Bbb R}+bQ_{\Bbb R}+cS_{\Bbb R}+dQ_{\Bbb R}S_{\Bbb R},\ B_{\Bbb R}\in[L_2({\Bbb R})],\ {\Bbb R}=(+\infty,-\infty), \end{displaymath} %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% where involution ,\\ to a matrix characteristic singular integral operator without shift: %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % , acting on the space . We will refer to the formulas as operator equalities. Different applications of operator equalities to singular integral operators and to boundary value problems are considered. \medskip %Operators equalities are main tools \cite{Ka01 SMM}, \cite{Ka07 %MathNachr}. %\begin{thebibliography}{99} %\bibitem{Ka01 SMM} [1] A. A. Karelin, On a relation between singular integral operators with a Carleman linear-fractional shift and matrix characteristic operators without s hift, Boletin Soc. Mat. Mexicana Vol. 7 No. 12 (2001), pp. 235--246. %\bibitem{Ka07 MathNachr} [2] A. Karelin, Aplications of operator equalities to singular integral operators and to Riemann boundary value problems, Math. Nachr. Vol. 280 No. 9-10 (2007), pp. 1108--1117
Dispelling the Myths Behind First-author Citation Counts
No full textWe 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
Revisiting the common envelope evolution in binary stars: A new semianalytic model for N -body and population synthesis codes
No full textWe present a novel way of modeling common envelope evolution in binary and few-body systems. We consider the common envelope inspiral as driven by a drag force with a power-law dependence in relative distance and velocity. The orbital motion is resolved either by direct N-body integration or by solving the set of differential equations for the orbital elements as derived using perturbation theory. Our formalism can model the eccentricity during the common envelope inspiral, and it gives results consistent with smoothed particles hydrodynamical simulations. We apply our formalism to common envelope events from binary population synthesis models and find that the final eccentricity distribution resembles the observed distribution of post-common-envelope binaries. Our model can be used for time-resolved common-envelope evolution in population synthesis calculations or as part of binary interactions in direct N-body simulations of star clusters
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