1,721,016 research outputs found
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
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
On temporal entropy and the complexity of computing the expectation value of local operators after a quench
No full text9 pages, 8 figuresWe study the computational complexity of simulating the time-dependent
expectation value of a local operator in a one-dimensional quantum system by
using temporal matrix product states. We argue that such cost is intimately
related to that of encoding temporal transition matrices and their partial
traces. In particular, we show that we can upper-bound the rank of these
reduced transition matrices by the one of the Heisenberg evolution of local
operators, thus making connection between two apparently different quantities,
the temporal entanglement and the local operator entanglement. As a result,
whenever the local operator entanglement grows slower than linearly in time, we
show that computing time-dependent expectation values of local operators using
temporal matrix product states is likely advantageous with respect to computing
the same quantities using standard matrix product states techniques.L.T. acknowledges support from the Proyecto Sinérgico CAM 2020 Y2020/TCS-6545 (NanoQuCo-CM), the CSIC Research Platform on Quantum Technologies PTI001, and from Spanish Projects No. PID2021-127968NB-I00 and No. TED2021-130552B-C22 funded by No. MCIN/AEI/10.13039/501100011033/FEDER, UE, and No. MCIN/AEI/10.13039/501100011033, respectively. C.R.M. acknowledges support from a “la Caixa” Foundation fellowship (ID No. 100010434, code LCF/BQ/DI21/11860031). This work has been financially supported by the Ministry of Economic Affairs and Digital Transformation of the Spanish Government through the QUANTUM ENIA project callQuantum Spain project, and by the European Union through the Recovery, Transformation and Resilience Plan– NextGenerationEU within the framework of the Digital Spain 2026 Agenda.Peer reviewe
Pauli weight requirement of the matrix elements in time-evolved local operators: Dependence beyond the equilibration temperature
No full text14 pages, 8 figuresThe complexity of simulating the out-of-equilibrium evolution of local operators in the Heisenberg picture is governed by the operator entanglement, which grows linearly in time for generic nonintegrable systems, leading to an exponential increase in computational resources. A promising approach to simplify this challenge involves discarding parts of the operator and focusing on a subspace formed by "light"Pauli strings - strings with few Pauli matrices - as proposed by Rakovszki et al. [Phys. Rev. B 105, 075131 (2022)2469-995010.1103/PhysRevB.105.075131]. In this work, we investigate whether this strategy can be applied to quenches starting from homogeneous product states. For ergodic dynamics, these initial states grant access to a wide range of equilibration temperatures. By concentrating on the desired matrix elements and retaining only the portion of the operator that contains Pauli strings parallel to the initial state, we uncover a complex scenario. In some cases, the light Pauli strings suffice to describe the dynamics, enabling efficient simulation with current algorithms. However, in other cases, heavier strings become necessary, pushing computational demands beyond our current capabilities. We analyze this behavior by introducing a measure of complexity, the operator weight entropy, which we compute for different operators across most points on the Bloch sphere.C.R.M. acknowledges support from a “la Caixa” Foundation fellowship (IDNo. 100010434, code LCF/BQ/DI21/11860031).L.T.acknowledges support from the Proyecto Sinérgico CAMY2020/TCS-6545NanoQuCoCM, the CSIC Research Platform on QuantumTechnologies PTI-001, and the Grant No. TED2021-130552B-C22 funded byMCIN/AEI/10.13039/501100011033 and the “European Union Next Generation EU/PRTR,”and Grant No. PID2021-127968NB-I00 funded byMCIN/AEI/10.13039 /501100011033.Peer reviewe
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
- …
