817 research outputs found
The Validity of Locus of Control Dimensions for Chicano Populations
The multidimensional locus of control literature supported the tenability of five
factorial dimensions: a) luck; fate, b) leadership/success, c) academics, d) politics, and e) respect.
Contending that the contradictory locus ofcontrol findings involving Chicano populations may be
due to methodological inadequacies, the purpose ofthe present study was to empirically determine
theappropriatenessof the five categories for comparing Chicano and Anglo populations. This was
done by factor analyzing the responses of 203 Anglo and 244 Chicano undergraduates to Rotter's
(1966) I-E scale separately, and then comparing the corresponding factor pairs by using Cliffs
(1966) congruence procedure. The luck/fate and leadership/success factors show substantial
invariance across the two samples, whereas the cultural equivalence ofthe remaining three factors
is somewhat questionable. The findings are discussed in relation to current knowledge of crosscultural
differences between Anglo and Chicano populations
Correspondence between Electro-Magnetic Field and other Dark Energies in Non-linear Electrodynamics
In this work, we have considered the flat FRW model of the universe filled
with electro-magnetic field. First, the Maxwell's electro-magnetic field in
linear form has been discussed and after that the modified Lagrangian in
non-linear form for accelerated universe has been considered. The corresponding
energy density and pressure for non-linear electro-magnetic field have been
calculated. We have found the condition such that the electro-magnetic field
generates dark energy. The correspondence between the electro-magnetic field
and the other dark energy candidates namely tachyonic field, DBI-essence,
Chaplygin gas, hessence dark energy, k-essenece and dilaton dark energy have
been investigated. We have also reconstructed the potential functions and the
scalar fields in this scenario.Comment: 11 pages, 7 figure
The Rotation Of The Deep Solar Layers
From the analysis of low-order GOLF+MDI sectoral modes and LOWL data (l > 3),
we derive the solar radial rotation profile assuming no latitudinal dependance
in the solar core. These low-order acoustic modes contain the most
statistically significant information about rotation of the deepest solar
layers and should be least influenced by internal variability associated with
the solar dynamo. After correction of the sectoral splittings for their
contamination by the rotation of the higher latitudes, we obtain a flat
rotation profile down to 0.2 solar radius.Comment: accepted in ApJ Letters 5 pages, 2 figure
Wavepacket basis for time-dependent processes and its application to relaxation in resonant electronic transport
Stroboscopic wavepacket basis sets [P. Bokes, F. Corsetti, R. W. Godby, Phys.
Rev. Lett. 101, 046402 (2008)] are specifically tailored for a description of
time-dependent processes in extended systems like non-periodic geometries of
various contacts consisting of solids and molecules. The explanation of the
construction of such a basis for two simple finite systems is followed by a
review of the general theory for extended systems with continuous spectrum. The
latter is further elaborated with the introduction of the interaction
representation which takes the full advantage of the time-dynamics built into
the basis. The formalism is applied to a semi-analytical example of electronic
transport through resonant tunnelling barrier in 1D. Through the time-dependent
generalisation of the Landauer formula given in terms of the Fourier expansion
of the transmission amplitude we analyze the temporal character of the onset of
the steady-state. Various time-scales in this process are shown to be directly
related to the energetic structure of the resonant barrier
Public debates driven by incomplete scientific data: the cases of evolution theory, global warming and H1N1 pandemic influenza
Public debates driven by incomplete scientific data where nobody can claim
absolute certainty, due to current state of scientific knowledge, are studied.
The cases of evolution theory, global warming and H1N1 pandemic influenza are
investigated. The first two are of controversial impact while the third is more
neutral and resolved. To adopt a cautious balanced attitude based on clear but
inconclusive data appears to be a lose-out strategy. In contrast overstating
arguments with wrong claims which cannot be scientifically refuted appear to be
necessary but not sufficient to eventually win a public debate. The underlying
key mechanism of these puzzling and unfortunate conclusions are identified
using the Galam sequential probabilistic model of opinion dynamics. It reveals
that the existence of inflexible agents and their respective proportions are
the instrumental parameters to determine the faith of incomplete scientific
data public debates. Acting on one's own inflexible proportion modifies the
topology of the flow diagram, which in turn can make irrelevant initial
supports. On the contrary focusing on open-minded agents may be useless given
some topologies. When the evidence is not as strong as claimed, the inflexibles
rather than the data are found to drive the opinion of the population. The
results shed a new but disturbing light on designing adequate strategies to win
a public debate.Comment: 31 pages, 7 figure
Critical points in a relativistic bosonic gas induced by the quantum structure of spacetime
It is well known that phase transitions arise if the interaction among
particles embodies an attractive as well as a repulsive contribution. In this
work it will be shown that the breakdown of Lorentz symmetry, characterized
through a deformation in the relation dispersion, plus the bosonic statistics
predict the emergence of critical points. In other words, in some quantum
gravity models the structure of spacetime implies the emergence of critical
points even when no interaction among the particle has been considered.Comment: 5 pages, no figure
Electron wave functions on in a static magnetic field of arbitrary direction
A basis set expansion is performed to find the eigenvalues and wave functions
for an electron on a toroidal surface subject to a constant magnetic
field in an arbitrary direction. The evolution of several low-lying states as a
function of field strength and field orientation is reported, and a procedure
to extend the results to include two-body Coulomb matrix elements on is
presented.Comment: 18 pages, 6 figure
Designing multifunctional chemical sensors using Ni and Cu doped carbon nanotubes
We demonstrate a "bottom up" approach to the computational design of a
multifunctional chemical sensor. General techniques are employed for describing
the adsorption coverage and resistance properties of the sensor based on
density functional theory (DFT) and non-equilibrium Green's function
methodologies (NEGF), respectively. Specifically, we show how Ni and Cu doped
metallic (6,6) single-walled carbon nanotubes (SWNTs) may work as effective
multifunctional sensors for both CO and NH3.Comment: 24th International Winterschool on Electronic Properties of Novel
Material
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