25,921 research outputs found
Getting the most from NOvA and T2K
The determination of the ordering of the neutrino masses (the hierarchy) is
probably a crucial prerequisite to understand the origin of lepton masses and
mixings and to establish their relationship to the analogous properties in the
quark sector. In this talk, we follow an alternative strategy to the usual
neutrino--antineutrino comparison: we exploit the combination of the
neutrino-only data from the NOvA and the T2K experiments by performing these
two off-axis experiments at different distances but at the same ,
being the mean neutrino energy and the baseline. This would require a minor
adjustment to the proposed off-axis angle for one or both of the proposed
experiments.Comment: 7 pages, 2 figures, Proccedings of Neutrino 2006 Conference, Santa
Fe, New Mexico, June 13-19, 200
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Implementation of a Hybrid Teaching Environment for a Traffic Engineering Course
Students learn in different styles. They learn via hearing and visualizing. They can also reflect and act upon what is presented to them. Afterwards, they start to reason in a logical and intuitive ways as well as memorizing and visualizing, and eventually building mathematical models. Teaching approaches also differ from one course to another and from one instructor to another. Some instructors tend to lecture, others demonstrate or discus while some focus on principles and applications. The quality of student learning process is controlled by the student’s own ability and previous preparation but it also depends on the affinity of the student’s learning style and the instructor’s teaching delivery style.
This case study illustrates the transition of a four-thousand level traffic engineering course from a pure face-to-face to a hybrid environment. The implemented hybrid teaching style included one face-to-face weekly lecture besides another lecture being posted online as a YouTube video. Analytical comparisons were conducted between two offerings of the course: before and after the hybrid teaching style Implementation. Based on the presented results, including improved overall grades, student enrollment increase, and positive evaluation feedback, it can be concluded that the implementation process was successful.Cockrell School of Engineerin
Puzzling out Neutrino Mixing Through Golden and Silver Measurements
We update a recent work devoted to resolve the degeneracies that appear in
the simultaneous extraction of and at future Neutrino
Factories (NF, that exploit the \emph{golden} channels, i.e.
()) and Superbeam experiments (SB, that measure
the () transitions). We consider
the neutrino fluxes obtained with a new optics design for the CERN-SPL SB and
assume the solar parameters within the LMA-I and the LMA-II regions indicated
by recent KamLAND data. The dangerous fake solution associated with the
-ambiguity remains after the combination of data from these two
facilities: in this perspective, we analyze the impact of the NF-\emph{silver}
channels, i.e. (). The
combination of data from these three experiments -NF(\emph{golden} and
\emph{silver} channels) plus SPL SB- can discover leptonic CP violation for
values of .Comment: 6 pages, 8 figures. Presented at XXXVIII Rencontre De Moriond:
Electroweak Interactions and Unified Theories Les Arcs, France, March 15--22,
200
Trivalent Graph isomorphism in polynomial time
It's important to design polynomial time algorithms to test if two graphs are
isomorphic at least for some special classes of graphs.
An approach to this was presented by Eugene M. Luks(1981) in the work
\textit{Isomorphism of Graphs of Bounded Valence Can Be Tested in Polynomial
Time}. Unfortunately, it was a theoretical algorithm and was very difficult to
put into practice. On the other hand, there is no known implementation of the
algorithm, although Galil, Hoffman and Luks(1983) shows an improvement of this
algorithm running in .
The two main goals of this master thesis are to explain more carefully the
algorithm of Luks(1981), including a detailed study of the complexity and, then
to provide an efficient implementation in SAGE system. It is divided into four
chapters plus an appendix.Comment: 48 pages. It is a Master Thesi
A Study of the Assimilative Behavior of the Voiced Labio-Dental Fricative in American English
Gradation is one of the main features of colloquial speech. It implies the presence of certain phonological processes that ease the transition between phonemes with different articulatory features. For English, one of these implied processes is assimilation, which is when the articulation of a segment is modified into another one already existing in the system. Our study takes Gimson (1994)’s suggestion that /v/ assimilates into /m/ when it is followed by the bilabial nasal. After observing and describing different cases of assimilation, we suggest more possible explanations to this phenomenon and more assimilative behaviors of /v/. Therefore, we conduct an experiment with six American- English L1s where they evaluate sentences whose articulation includes our suggested proposals. The results show Gimson’s theory not to be as accurate as expected. Furthermore, we prove that /v/ can assimilate into /b/, /ɂ/ and /d/ when it is followed by bilabial, velar and alveolar phonemes.La gradación es una de las características más significativas del lenguaje coloquial. Esta implica la presencia de ciertos procesos fonológicos que facilitan la transición entre fonemas con distintas articulaciones. En el caso del inglés, uno de estos procesos es la asimilación, que consiste en cambiar la articulación de un segmento por la de otro existente en el sistema. Este estudio se basa en la propuesta de Gimson (1994), por la que /v/ se asimila a /m/ cuando le sigue la bilabial nasal. Tras observar y describir más casos de asimilación, nos planteamos distintos comportamientos asimilativos de /v/ en este y otros contextos, que fueron evaluados por medio de un experimento realizado a seis nativos de inglés-americano. Los resultados muestran que la teoría de Gimson no es tan apropiada como se esperaba. Además, concluimos que /v/ puede asimilar a /b/, /ɂ/ y /d/ cuando le siguen ciertos sonidos bilabiales, velares y alveolares.Grado en Estudios Inglese
Large quantum gravity effects: Cylindrical waves in four dimensions
Linearly polarized cylindrical waves in four-dimensional vacuum gravity are
mathematically equivalent to rotationally symmetric gravity coupled to a
Maxwell (or Klein-Gordon) field in three dimensions. The quantization of this
latter system was performed by Ashtekar and Pierri in a recent work. Employing
that quantization, we obtain here a complete quantum theory which describes the
four-dimensional geometry of the Einstein-Rosen waves. In particular, we
construct regularized operators to represent the metric. It is shown that the
results achieved by Ashtekar about the existence of important quantum gravity
effects in the Einstein-Maxwell system at large distances from the symmetry
axis continue to be valid from a four-dimensional point of view. The only
significant difference is that, in order to admit an approximate classical
description in the asymptotic region, states that are coherent in the Maxwell
field need not contain a large number of photons anymore. We also analyze the
metric fluctuations on the symmetry axis and argue that they are generally
relevant for all of the coherent states.Comment: Version accepted for publication in Int. J. Mod. Phys.
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