1,720,969 research outputs found
Simulation of Neutron Rich Isotopes at Beta Decay Station in SPES
Get PDFThe aim of this thesis is to explore the capabilities of the beta decay station
to be installed at the LNL for the study of the decay of radioactive nuclei
produced at the ISOL facility SPES. The β-decay station will perform γ and β
energy measurements of exotic ions implanted on a moving tape. Studying
the beta decay of exotic isotopes provides crucial insights into nuclear struc-
ture, astrophysical processes, fundamental interactions, and the limits of our
current understanding of the universe. It helps advance our knowledge in
various scientific disciplines and contributes to both fundamental research
and practical applications. In particular, these kind of measurements offer
the possibility to test and probe the limits of the Standard Model of particle
physics and help in understanding the processes that occur in stars, such as
nucleosynthesis. Moreover, beta decay studies have practical implications
that extend to fields such as nuclear medicine, where they contribute to the
advancement of imaging techniques and cancer treatment methods.
Unfortunately, due to delays that have accumulated in recent years in the
implementation of measurement devices, largely caused by COVID and tech-
nical difficulties encountered, the first beams will not be ready until the end
of next year to make a real experiment. So this thesis is basically focused on
the performance simulation of the experimental apparatus, which is prelim-
inary mounted in the experimental room of the SPES building, waiting to be
connected on the SPES RIBs beam line.
We have simulated an experiment with 148Cs isotopes, that was already
realized at ISOLDE (CERN) radioactive ion beam (RIB) facility in 2016, in or-
der to investigate the region of n-rich Ba nuclei, which is known to exhibit
strong octupole correlations. GEANT4 built-in radioactive decay option do
not consider β decays with delayed neutron emission and furthermore the
database may not be entirely up to date for exotic isotopes. To this purpose, we have first built four Wolfram Mathematica software, that shoul be run in
advance of the simulation, with the purpose of obtaining as much informa-
tion as possible for an exhaustive simulation. Given an ion of interest, the
four software are capable of finding a complete list of all the decay processes,
optimize the measuring and implantation time windows, the radioactive ac-
tivities left on the tape and finally calculating the conversion coefficients to
update the GEANT4 database. The simulation have provided satisfying re-
sults and we expect it to became a useful tool that can help to better under-
stand the measurements that will be performed in the future, once the beta
decay station will be fully operational.
This PhD project was done also in collaboration with CAEN S.p.A, in Ap-
pendix A is described the CAEN A5202 board and in particular its perfor-
mance in γ spectroscopy. The A5202 board in an application specific inte-
grated circuit (ASIC) based front end, optimized to work in conjunction with
silicon photo multipliers (SiPM). ASIC technology strength lays in the possi-
bility of accommodating a large number of acquisition channel in reduced di-
mensions and with low power consumption. The ASIC chip employed is the
Citiroc-1A, which performs energy acquisition through a pulse height anal-
ysis algorithm. The Citiroc-1A have been used to take measurements with
a 6x6x15 mm3 Cerium-doped Lutetium Yttrium Orthosilicate (LYSO(Ce)),
Caesium Iodine (CsI) and Bismuth Germanate (BGO) paired with a single
6x6 mm2 SiPM and 22Na, 137Cs and 60Co radioactive sources. The energy
resolution of the photopeaks are comparable with what obtained with the
same crystal, radioactive source and a charge integration digitizer (CAEN
DT5720A) and whith results found on literature. The results obtained are
discussed in further detail in ref. [1]. In the future, the beta decay station in
SPES will also include scintillator arrays for neutron measurements in order
to have a better understanding of the decaying isotopes, and the A5202 can
be suitable set-up for this kind of measurements
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
Author Under Sail The Imagination of Jack London, 1893-1902
No full textIn Author Under Sail, Jay Williams offers the first complete literary biography of Jack London as a professional writer engaged in the labor of writing. It examines the authorial imagination in London's work, the use of imagination in both his fiction and nonfiction, and the ways he defined imagination in the creative process in his business dealings with his publishers, editors, and agents. In this first volume of a two-volume biography, Williams traverses the years 1893 to 1902, from London's "Story of a Typhoon" to The People of the Abyss. The Jack London who emerges in the pages of Author Under Sail is a writer whose partnership with publishers, most notably his productive alliance with George Brett of Macmillan, was one of the most formative in American literary history. London pioneered many author models during the heyday of realism and naturalism, blurring the boundaries of these popular genres by focusing on absorption and theatricality and the representation of the seen and unseen. London created an impassioned, sincere, and extremely personal realism unlike that of other American writers of the time. Author Under Sail is a literary tour de force that reveals the full range of London as writer, creative citizen, and entrepreneur at the same time it sheds light on the maverick side of machine-age literature.Intro -- Title Page -- Copyright Page -- Dedication -- Contents -- Acknowledgments -- Introduction -- 1. Spirit Truth -- 2. From Absorption to Theatricality and Back Again -- 3. "I Will Build a New Present" -- 4. Sons as Authors -- 5. Fathers as Publishers -- 6. The Daughter as Author -- 7. Lovers as Authors -- 8. At Sea with the Family -- 9. Yellow News, Yellow Stories -- 10. The Return Home -- Notes -- Bibliography -- Index -- About Jay WilliamsIn Author Under Sail, Jay Williams offers the first complete literary biography of Jack London as a professional writer engaged in the labor of writing. It examines the authorial imagination in London's work, the use of imagination in both his fiction and nonfiction, and the ways he defined imagination in the creative process in his business dealings with his publishers, editors, and agents. In this first volume of a two-volume biography, Williams traverses the years 1893 to 1902, from London's "Story of a Typhoon" to The People of the Abyss. The Jack London who emerges in the pages of Author Under Sail is a writer whose partnership with publishers, most notably his productive alliance with George Brett of Macmillan, was one of the most formative in American literary history. London pioneered many author models during the heyday of realism and naturalism, blurring the boundaries of these popular genres by focusing on absorption and theatricality and the representation of the seen and unseen. London created an impassioned, sincere, and extremely personal realism unlike that of other American writers of the time. Author Under Sail is a literary tour de force that reveals the full range of London as writer, creative citizen, and entrepreneur at the same time it sheds light on the maverick side of machine-age literature.Description based on publisher supplied metadata and other sources.Electronic reproduction. Ann Arbor, Michigan : ProQuest Ebook Central, YYYY. Available via World Wide Web. Access may be limited to ProQuest Ebook Central affiliated libraries
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