Manual de Direito do Trabalho
Xavier, Bernardo da Gama Lobo
2011-01-01
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A partial-wave analysis of K+ -nucleon scattering has been performed. Energy-dependent
and energy-independent solutions for the isoscalar and isovector amplitudes are generated
by fitting data with a chi-squared minimization technique. The isoscalar amplitudes extend
to a K+incident lab kinetic energy of 1100 MeV; the isovector amplitudes extend to 2650
MeV. Due to the lack of a neutron target and scarcity of isoscalar data, K+ -deuteron
inelastic and elastic data are utilized in the analysis. The theories which incorporate the
K+ -deuteron data are fixed-scatterer, single-scattering impulse approximations.
Two different techniques are employed to find preliminary energy-dependent isoscalar solutions for the scattering amplitudes. The first technique involves initializing to two different single-energy solutions of previous studies....
Assuming a polynomial of the fourth degree to describe the velocity function, the momentum integral equation for a second-order fluid is used to develop differential equations describing the boundary-layer for second-order flow past external surfaces. Using the momentum integral equation and appropriate boundary conditions, results are tabulated for both plane and axisymmetric stagnation flows. The effect of the second-order viscosity terms on the boundary-layer parameters for problems of flow past a circular cylinder and flow past a sphere is discussed. An interesting result is found in the case of flow past a sphere; for certain values of the second-order viscosity terms, there is a reduction in the viscous drag from that of Newtonian flow.
KOPIO is an experiment designed to search for the CP-symmetry-violating
reaction K^0 -> pi^0+nu+nubar. Measurement of the branching ratio of this reaction, depending on
the accuracy of the measurement, could be the most precise measurement of the CP violation
parameters of the Standard Model to date. The K^0 -> pi^0+nu+nubar reaction is
exceedingly rare, with an expected branching ratio of (3 ± 2)⋅10^(−11) . The rareness of this
reaction means two things: 1) that we need prodigious numbers of kaons, and 2) that a
multitude of âimproperâ decays will have to be screened out by means of a veto detector
system, part of which is being designed here at Virginia Tech.
This detector must be able to detect the passage of daughters of the undesired
decay reactions (charged particles and gammas). It must be operational inside a magnetic
field, a...
An optical image feedback system utilizing a cavity with a phase-conjugate mirror (PCM) has been studied. A new theory, based on operators, is developed to describe the steady-state output of the cavity. The use of operators allows one to describe the various optical operations and transformations needed in the optical implementation of iterative algorithms. The characteristics of the cavity are discussed using an expansion of the cavity fields in the cavity eigenfunctions.
Several image processing applications using a PCM cavity are proposed and are studied using computer simulations. These theoretical studies indicate that a PC11 cavity can be useful in many applications.
Optical phase conjugation was realized using a single crystal of photorefractive BaTi03 in a degenerated four-wave mixing geometry. The reflectiv...
The spatiotemporal dynamics of a photorefractive phase-conjugate resonator (PPCR) is studied both experimentally and analytically. The resonator is a confocal cavity bounded by a dielectric mirror and a phase-conjugate mirror in a four wave mixing geometry. The effect of the Bragg mismatch, which is caused by the misalignment of the pump fields, is experimentally shown to break the cylindrical symmetry of the system and to increase the speed of the dynamics. By studying the first non stationary state at a cavity Fresnel number of F=2.0, the effect of the transverse component of the mismatch is shown to add a transverse phase to the wavefront of the phase-conjugate field, leading to the periodic nucleation of a pair of phase defects.
A model of this state is developed in terms of the competition of a few transverse patterns. ...
The world is shifting into an unprecedented
technological age. Towns such as Blacksburg, Virginia, are
now being called "electronic villages" with electronic
infrastructure which not only ties together all aspects of
the town but also connects the town to the world. Reality
becomes "virtual" with information unimpeded by time and
distance.
This rapid advancement in electronical technology is having an impact on world educational systems. Those planning the future of education have a need to know what directions this new technology might take in order to interface such technologies with the schools. The purpose of this study was to predict which present and emerging electronic technologies would be in significant use in the K-12 schools of the year 2000.
The Delphi technique was used to gather predictions from an expert panel of t...
This paper presents the development of an
instructional unit that tested an instructional
development model. The model was based
on the Instructional Project Development and
Management (IPDM) model designed by
Castelle Gentry. A short student seminar was
developed using the stages and techniques
proposed by Gentry. The subject of the
seminar was electronic music synthesizer
programming. An evaluation of the seminar
concludes that it is an efficient and complete
model for developing instructional units.
The TOPEX/POSEIDON Project is a joint U.S. and French mission to develop and operate an Earth orbiting satellite capable of making accurate measurements of the mean sea level in a way that allows the study of ocean dynamics. The understanding of ocean dynamics is very important in order to study events such as El Nino. Soon after the launch of the TOPEX satellite, some unusually high, but localized, values of the ocean's radar cross section, sigma-0, were observed by scientists at the NASA Goddard Space Flight Center. These phenomena have been referred to as sigma-0 blooms, and are accompanied by an increase in noise in the significant wave height (SWH) and altitude measurements. Since approximately 5% of all data recorded by the satellite contains sigma-0 blooms, it is important to understand their causes so that corrective measures c...
The need to construct a fermion quantum field theory in
black-hole spacetimes is an acute one. The study of
gravitational collapse necessitates the need of such. In
this dissertation, we construct the theory of free fermions
living on the static Schwarzschild black-hole and the
rotating Kerr black-hole. The construction capitalises
upon the fact that both black-holes are stationary
axisymmetric solutions to Einstein's equation. A
factorisability ansatz is developed whereby simple
quantum modes can be found, for such stationary
spacetimes with azimuthal symmetry. These modes are
then employed for the purposes of a canonical
quantisation of the corresponding fermionic theory. At
the same time, we suggest that it may be impossible to
extend a quantum field theory continuously across an
event horizon. This split of a quantum field theory e...
The present study examined the nature of test anxiety from a cross-cultural perspective, with a specific reference to children in the Indian culture. In particular, the present study investigated the role of intra-individual variables (fear, anxiety, depression, and somatization) and extra-individual variables (activities schedule, consequences of failure, perceived parental expectations and involvement and parental expectations and involvement) in predicting test anxiety. A culturally sensitive methodology consistent with Berryâs imposed etic-emic-derived etic approach was adopted wherein a combination of qualitative and quantitative data was examined. A sample of 231 children from government, government-aided, and private schools participated in the study. Qualitative data was collected using focus groups and open-ended questions and...
