1,721,004 research outputs found
Nuclear capture rate of the .mu. meson
No full textGeneral view of the experimental set-up for the measurement of the nuclear capture rate of the .mu. meson in gaseous hydrogen
Mass Hierarchy (Structure)
No full textThis work presents a structural framework that derives particle masses from internal geometric organization rather than free parameters or external fields. Beginning with a 12-vertex gluonic core shared by the electron and positron, the framework generates higher-mass leptons and the charged pion through the addition of discrete gluonic shells. The muon emerges from a single 48Γ shell surrounding the core, while the tau is produced by an additional 192Γ shell operating in an excited confinement regime. The pion is shown to correspond to the same 48Γ structure as the muon, but in a less coherent state, explaining its mass and decay behavior without invoking quark–antiquark
potentials. Shell stability is treated as a geometric property: the electron’s closed
12Γ core forms a resonance-stabilized structure, whereas the open-shell geometries of
the muon and tau lack this symmetry and therefore decay. Shell collapse provides a
structural explanation for neutrinos as minimal, neutral fragments and accounts for
hadronic channels in high-energy tau decays. The resulting system reconstructs the
observed lepton and pion mass hierarchy without adjustable couplings and establishes
an explicit link between internal structure and expressed rest mass. This framework
offers a new approach to the mass hierarchy problem and a coherent path toward
structurally grounded particle classification
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
A study of the problems involved in the detection of mu meson pairs from the MIT synchrotron
Full text linkIn an attempt to relate the mu meson to the quanta of the nuclear force field, Wentael as proposed a theory in which the pi meson is essentially a quantum state of a mu meson pair. Because of the anticpated low cross section for the process, and the low efficiency for detection of pair production, a study of the detection problem was needed before a meaningful experiement could be undertaken. The general dector requirements have been analyzed, and a high efficiency detector manifold has been designed and contstructed. The detection efficiency, and expected coutningrates for pair production by either the Wentzelian process, or an electro magnetic process, have been calculatd for several target elements. Reponse tests have been made of the first 6BN6 coincidence circuit, and of the Model 402 distributed amplifiers, preliminary to their use in the experiment. A preliminary set of experiments, with modified detector systems, has been conducted in the Synchotron beam to resolve shielding, collimation, and background problems. From these experiments, an upper limit has been established for the Wentzel production cross section at 2.5 x 10(5) times the elctromagneic cross section. This is about the same limit established by Martinelli and his co-workers at the University of California. Final assembly and bench testing of the detector system is currently underway, in anticipation of an early run with the Synchotron.http://archive.org/details/astudyofproblems109452486
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
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