1,721,044 research outputs found
A Comparison of MuDST and PicoDST Data Analysis Methods
Full text linkFor STAR-experiment associated research at Brookhaven National Laboratory, the primary objective is the study and characterization of the Quark-Gluon Plasma, or QGP. The data is stored in subsets of the original, full 'Data Summary Tape' or DST format. The PicoDST format is the new, more compact way in which all data from particle collider experiments is stored. Because this data format is relatively new, much of the existing data analysis scripts written by the TAMU group to run on root4star (the modified ROOT software package used for the STAR experiment) work only with MuDST-type files, which is the older format. While extensive documentation exists for both the PicoDST and MuDST formats, not every aspect is exactly analogous, and therefore methods to convert older MuDST-scripts to perform the same analytical functions with PicoDST files must be created. In this paper, the differences between the PicoDST and MuDST formats will be considered, as well as the differences between algorithms written to accomplish the same task with either format. In addition, a significantly higher time-efficiency is demonstrated for a particular PicoDST algorithm when measured against its MuDST counterpart
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
Reconstruction of Neutral-Triggered Recoil Jets in sqrt(s) = 200 GeV p+p Collisions at the STAR Experiment
Full text linkThe collision of relativistic heavy-ion such as the AuAu-collisions studied at the Relativistic Heavy-Ion Collider produce a hot, dense medium with properties consistent with that of a state of matter in which quarks and gluons become deconfined, the Quark-Gluon Plasma. Collimated sprays of hadrons known as jets are produced by the fragmentation of quarks and gluons during the early stages of a heavy-ion collision, and offer a valuable probe of this medium. In particular, jets recoiling from energetic direct photons offer a "golden channel" through which we may study the complex dynamics of the medium produced in heavy-ion collisions. However, to understand the interplay between jets and the produced medium, a high-precision reference is needed in which no medium is produced.
Thus, this thesis presents a high precision measurement of the semi-inclusive yields of charged jets recoiling from energetic ��dir and ����� triggers in ���s = 200 GeV pp-collisions recorded by the STAR detector during the 2009 running year. The recoil jets were reconstructed from charged particles using the anti-kT algorithm with jet resolution parameters 0.2 and 0.5. A regularized unfolding scheme was employed to correct the measured per-trigger recoil jet yields for finite reconstruction efficiency and resolution. The energy resolution of the triggers was assessed using a simulation of the STAR electromagnetic calorimeter. The effect of a finite trigger resolution was applied to recoil jet spectra generated by PYTHIA 8.185 using a weighting scheme, and the corrected data were compared
against the weighted recoil jet spectra from PYTHIA 8.185
Centrality dependence of antiproton production in Proton-Nucleus Collisions at 17.5 and 12.3 GeV
Full text linkExperiment 910, performed at the Brookhaven National Laboratory Alternating Gradient Synchrotron (BNL-AGS), is a fixed target proton-nucleus experiment. We analyze data for nominal beam momenta 12 GeV/c and 18 GeV/c and targets Au, Cu, and Be. We characterize events with the number of projectile collisions. A new model is presented to relate the number of grey tracks to the number of projectile collisions and compared to a previously established model. The results of the models are similar, but the new model is shown to better describe the data. We investigate antiproton production. In an attempt to disentangle the production mechanisms and reabsorption of antiprotons within the nucleus, yields of antiproton production are compared for different targets and beam momenta. For the first time, antiproton multiplicities are investigated as a function of the number of projectile collisions. Results show that the mean antiproton multiplicities tend to decrease with increasing number of projectile collisions. We compare results with cascade model predictions
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
- …
