1,721,142 research outputs found
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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 Study on PbMoO4 Phonon-Scintillation Detection with MMC Readouts for a Neutrinoless Double Beta Decay Search
No full textThe advanced Mo-based rare process experiment (AMoRE) is an international project searching for the neutrinoless double beta (0 nu beta beta) decay of Mo-100 using low-temperature calorimetric detection of heat and light signals based on magnetic microcalorimeter (MMC) readouts. Li2MoO4 crystals have been considered as the main target crystals for the second phase of the AMoRE project, which aims to use 100 kg of Mo-100. However, the hygroscopicity of Li2MoO4 requires moistureless processes during surface treatment, storage, detector assembly, and installation. Li2MoO4 crystals are nonhygroscopic and exhibit high scintillation efficiency, often leading to high particle discrimination power in the phonon channel via pulse-shape analysis and light/heat ratio variation. A low-temperature detector setup with a 1 cm 3 cubic crystal of Li2MoO4 was prepared for simultaneous heat and light detection based on MMC readouts. After study of internal background control using archeological Pb, Li2MoO4 crystal can be a promising candidate crystal. We present a feasibility study of Li2MoO4 crystals for a 0 nu beta beta experiment.11Nsciescopu
Li 2MoO 4 Phonon–Scintillation Detection Systems with MMC Readout
No full textWe developed measurement systems for the simultaneous detection of phonon and scintillation signals from Li 2MoO 4 crystals based on the metallic magnetic calorimeter (MMC) technology. Two measurements were carried out using Li 2MoO 4 crystals of different sizes. The first measurement was conducted with a compact detection system designed for a 1×1×1cm3 crystal. An advanced light detector with Neganov–Luke phonon amplification was adopted in the compact setup. Later, the second experiment was carried out using a cylindrical Li 2MoO 4 crystal of 5 cm in diameter and 5 cm in height. Another light detector was implemented with a 2-in. Ge wafer and an MMC sensor. Both measurements resulted in simultaneous detection of heat and light signals. Clear particle discriminations between α- and β/ γ-induced events were demonstrated by comparing amplitudes of the heat and light signals in both measurements. The heat signals in the larger setup showed an energy resolution of 18 keV FWHM for 2615 keV γ-rays. The energy linearity of the detector response was investigated for a suitable calibration near 3.034 MeV, the Q value of 100Mo double-beta decay11Nsciescopu
Low temperature property study of MMCs used for neutrinoless double beta decay
No full text© 2021 IEEE. Personal use is permitted, but republication/redistribution requires IEEE permission. We present a comparison of the two types of metallic magnetic calorimeters (MMCs) developed for a large-scale neutrinoless double beta decay (0νββ) search experiment. As high resolution micro-calorimeters,MMCsemploy micro-fabricated superconducting circuits to measure the changes in magnetization of a paramagnetic sensor material. We constructed two alpha spectrometers with two MMC sensors made of Au:Er and Ag:Er (i.e., gold and silver alloys with small concentrations of Er). A piece of gold foil with a heat capacity comparable to that of 350 g CaMoO4 crystal near 10 mK was used as the absorber for each alpha spectrometer. These detector setups allowed us to investigate the temperature dependence of magnetization for the different sensor materials over a wide temperature range with various amounts of field current. The magnetizationmeasurements for both the Au:Er and Ag:Er sensors were in good agreement with calculations for field currents of up to 100 mA. Moreover, the measured and estimated pulse heights of alpha events agreed with each other, and were compared between the different sensor materials.We discuss howthe excess heat capacity fromthe nuclear spins in Au:Er influences the pulse size and shape in calorimetric detection. Moreover, we describe the benefit of using Ag:Er sensors
in thermal calorimeters with large crystal absorbers in a 0νββ search experiment.11Nsciescopu
Study on Phonon Amplification of Neganov–Luke Light Detectors
No full textWe report progress on the development of a light detector with Neganov–Luke (NL) phonon amplification. Double comb-like electrodes were fabricated on an intrinsic Si wafer to apply an electric field. A metallic magnetic calorimeter was used for a sensitive measurement of the temperature increase originating from the light absorption in the wafer and NL phonon amplification. The NL light detector was applied to the simultaneous detection of heat and light signals from a ZnWO 4 scintillating crystal. Clear amplification of the light signals was obtained for various voltages applied to the electrodes, while no change in the heat signals was observed. The voltage dependence of the measured gain was investigated for a few efficiency parameters, such as the saturation voltage required to suppress the recombination of electron-hole pairs and the heat generation efficiency of the NL effect11Nsciescopu
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe 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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