1,721,023 research outputs found
Skin temperature monitoring by a wireless sensor
No full textThe present paper reports the development of a temperature data logger based on a temperature sensitive resistive film and an RFID tag. Thanks to its capability of wireless communication, the device is going to be used for a minimally invasive remote monitoring of the skin temperature under a bandage or a wound dressing
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
Interpreting the long-term variability of the changing-look AGN Mrk 1018
No full textWe present a comprehensive study of the changing-look active galactic nucleus (CL-AGN) Mrk 1018 based on the largest dataset of optical, UV, and X-ray spectro-photometric data ever assembled for this source. Our investigation comprises a detailed analysis of X-ray spectra, broad-band photometry, and optical-to-X-ray spectral energy distribution (SED) fitting, with the aim being to unravel the nature of the changing-look behavior observed in Mrk 1018 between 2005 and 2019. Based on the results of our analysis, we confirm that, in those 14 years, the X-rays from the source underwent a significant spectral variation, with the hardness ratio between the 0.5 2 keV band and the 2 10 keV band increasing from 0.2 ± 0.1 to 0.4 ± 0.1. We also validate the dramatic broad-band dimming, with the optical, UV, and X-ray luminosities decreasing by a factor of > 7, > 24, and ∼9, respectively. We find that the declining UV emission is driving these drops. By describing the X-ray spectra with a two-Comptonization model, with a hot (kT ∼ 100 keV) and a warm (kT < 1 keV) Comptonizing medium reprocessing the photons from the accretion disk, we reach the conclusion that, between 2005 and 2019, the properties of the hot medium remained the same, while the warm component cooled down from a temperature of ∼0.4 keV to ∼0.2 keV. This cooling can be explained by the weakening of the magnetic fields in the accretion disk and is also the source of the UV dimming. We propose that this decline is caused by the formation of a jet, itself originating from the change in the state of the inner accretion flow from a geometrically thin, optically thick structure to a geometrically thick, optically thin flow. Our optical-to-X-ray SED fitting seems to support this conclusion, as the estimated accretion rate normalized to the Eddington rate in the bright state (μ ∼ 0.06) is above the critical value μ = 0.02 for a stable radiative flow, while in the faint state we find μ ∼ 0.01 < 0.02, which is compatible with advective accretion. Instabilities arising at the interface of the state transition are then able to reduce the viscous timescale from ∼105 years to the observed ∼10 years of Mrk 1018 variability, reconciling all the observational properties of this CL-AGN into a complex but elegant physically motivated framework. Finally, we explored a possible mechanism triggering the state transition of the inner accretion flow. Our speculation is that gaseous clouds are pushed onto the innermost regions of the AGN by a galactic (dynamical friction) and/or an extragalactic process (wet merger, cold chaotic accretion). When one of these clouds passes by, it deposits material onto the accretion disk, causing the accretion flow to puff up , establishing the state transition. If this scenario is confirmed by future numerical simulations, it will open a new branch of study to place CL-AGN into our current understanding of the feeding and feedback of AGN. We also think that our results can be applied to other CL-AGN as well, and speculate that an accretion rate of μ ∼ 0.02, coupled with minor disturbances in the accretion disk, could indeed be the primary factor prompting the complex changing-look phenomenon
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
A temperature sensor based on a MWCNT/SEBS nanocomposite
No full textThe fabrication of a temperature sensor based on multi-walled carbon nanotubes (MWCNTs)/styreneb-(
ethylene-co-butylene)-b-styrene (SEBS) triblock copolymer composite is reported. The device was
realized by drop casting 10 !l of a MWCNTs dispersion in a toluene solution of SEBS onto gold electrodes
fabricated onto a polyimide support. Thermogravimetric and electrical resistance measurements
highlighted a good reproducibility of film composition and sensing properties. A negative temperature
coefficient with an absolute value comparable to the highest values in metals was measured when a substantial
amount of MWCNTs was incorporated into the nanocomposite (40% by weight), and a five-fold
increase was observed close to the percolation threshold. Though such sensitivity seems to be partly lost
after the first heating, the results allowed us to be optimistic about the feasibility of realizing nanocomposite
films with temperature sensitivities comparable to that of common thermistors in the range 20–60 °C
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
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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