1,720,956 research outputs found
Solar boron-8 neutrino detection with the LZ dark matter experiment
No full textWe present the projected sensitivity of the LUX-ZEPLIN (LZ) dark matter experiment to solar boron-8 neutrinos detected via coherent elastic neutrino-nucleus scattering, and the physics prospects opened by such a measurement with the LZ detector
ATLAS Electromagnetic Calorimeter performance measurements, search for the Higgs boson in the channel and detector development for position reconstruction of noble liquid scintillation
No full textIn this thesis, a method for the recovery of QED Final State Radiation
photons emitted from muons at small (collinear, ∆R < 0.15) angles is extended
to include photons emitted at larger angles (∆R ≥ 0.15) from both
electrons and muons. The method is used in the search for Higgs boson
decays to 4-leptons, H → ZZ∗ → 4ℓ, in ATLAS, correcting 3 out of 60
candidate events. It is also applied in the search for Higgs decays to a Z
boson and a photon, H → Zγ, introducing a 2% improvement in the upper
limit set by the analysis, yielding 11 × S M at mH = 125.5 GeV (95% CL).
The method is also used in the measurement of the photon electromagnetic
scale to provide a precision better than 0.5%, reducing the measured
Higgs mass systematic uncertainty obtained from the H → γγ analysis.
Data-Monte Carlo comparisons are performed to ascertain the validity of
the procedure before its application to the different measurements. The
collinear photon selection has an efficiency of 70% and a purity of 85%,
and a collinear photon is found in 4% of Z → µ+µ−events. The noncollinear
selection has an efficiency of 60% and a purity > 95%, and a
photon is found in ∼ 1% of events. The second part of the thesis presents new results from a developed prototype Gaseous Photomultiplier detector based on a cascade of Thick GEM
structures intended for gamma-ray position reconstruction in liquid argon.
The detector has a MgF2 window, transparent to VUV light, and a CsI
photocathode deposited on the first THGEM. A 10 cm2
area is instrumented with four readout channels. A gain of 8 · 105 per photoelectron
and ∼100% photoelectron collection efficiency are measured at stable operation
settings. A ∼100 µm position resolution at 100 kHz readout rate
is demonstrated at room temperature. Structural integrity tests of the detector
and seals are successfully performed at cryogenic temperatures by
immersing the detector in liquid Nitrogen, laying a good foundation for
future operation tests in noble liquids. This new type of device provides a
low cost solution for large-area real-time gamma-ray imaging
ATLAS Electromagnetic Calorimeter performance measurements, search for the Higgs boson in the H→Zγ channel and detector development for position reconstruction of noble liquid scintillation
Get PDFIn this thesis, a method for the recovery of QED Final State Radiation photons emitted from muons at small (collinear, dR < 0.15) angles is extended to include photons emitted at larger angles (dR ≥ 0.15) from both electrons and muons. The method is used in the search for Higgs boson decays to 4-leptons, H→ZZ*→4l, in ATLAS, correcting 3 out of 60 candidate events. It is also applied in the search for Higgs decays to a Z boson and a photon, H→Zγ, introducing a 2% improvement in the upper limit set by the analysis, yielding 11xSM at m(H) = 125.5 GeV (95% CL). The method is also used in the measurement of the photon electromagnetic scale to provide a precision better than 0.5%, reducing the measured Higgs mass systematic uncertainty obtained from the H→γγ analysis.
Data-Monte Carlo comparisons are performed to ascertain the validity of the procedure before its application to the different measurements.
The collinear photon selection has an efficiency of 70% and a purity of 85%, and a collinear photon is found in 4% of Z→μμ events. The non-collinear selection has an efficiency of 60% and a purity >95%, and a photon is found in ~1% of events.
The second part of the thesis presents new results from a developed prototype Gaseous Photomultiplier detector based on a cascade of Thick GEM structures intended for gamma-ray position reconstruction in liquid argon.
The detector has a MgF2 window, transparent to VUV light, and a CsI photocathode deposited on the first THGEM. A 10 cm2 area is instrumented with four readout channels.
A gain of 8·10E5 per photoelectron and ~100% photoelectron collection efficiency are measured at stable operation settings.
A ~100 μm position resolution at 100 kHz readout rate is demonstrated at room temperature. Structural integrity tests of the detector and seals are successfully performed at cryogenic temperatures by immersing the detector in liquid Nitrogen, laying a good foundation for future operation tests in noble liquids. This new type of device provides a low cost solution for large-area real-time gamma-ray imaging
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
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
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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