465 research outputs found
Stimulation of the ferricyanide Hill reaction and coupled photophosphorylation by phenazine methasulphate
Stability of junction configurations in ferromagnet-superconductor heterostructures
We investigate the stability of possible order parameter configurations in
clean layered heterostructures of the type, where is a
superconductor and a ferromagnet. We find that for most reasonable values
of the geometric parameters (layer thicknesses and number) and of the material
parameters (such as magnetic polarization, wavevector mismatch, and oxide
barrier strength) several solutions of the {\it self consistent} microscopic
equations can coexist, which differ in the arrangement of the sequence of ``0''
and ``'' junction types (that is, with either same or opposite sign of the
pair potential in adjacent layers). The number of such coexisting self
consistent solutions increases with the number of layers. Studying the relative
stability of these configurations requires an accurate computation of the small
difference in the condensation free energies of these inhomogeneous systems. We
perform these calculations, starting with numerical self consistent solutions
of the Bogoliubov-de Gennes equations. We present extensive results for the
condensation free energies of the different possible configurations, obtained
by using efficient and accurate numerical methods, and discuss their relative
stabilities. Results for the experimentally measurable density of states are
also given for different configurations and clear differences in the spectra
are revealed. Comprehensive and systematic results as a function of the
relevant parameters for systems consisting of three and seven layers (one or
three junctions) are given, and the generalization to larger number of layers
is discussed.Comment: 17 pages, including 14 Figures. Higher resolution figures available
from the author
On Charge Quantization and Abelian Gauge Horizontal Symmetries
Under the assumption that there exists a local gauge horizontal symmetry
wich allows only for a top quark mass at tree level, we look for the
constraints that charge quatization and the family structure of the standard
model imposes on that symmetry.Comment: 13 pages, LaTeX, Acepted in Physics Letters
Passion and intention among aspiring entrepreneurs with disabilities: The role of entrepreneurial support programs
Purpose: This study examines the relationship between entrepreneurial passion, entrepreneurial support programs, and entrepreneurial intention, and the moderating role of entrepreneurial support programs in the relationship between entrepreneurial passion and entrepreneurial intention, among students with physical disabilities in Nigerian tertiary institutions.
Methodology: This study used a closed-ended questionnaire survey, composed of previously validated scales, to sample 209 students with physical disabilities at tertiary institutions in Nigeria. Hierarchal regression was performed to assess the relationships between the variables and test the hypotheses.
Findings: Both entrepreneurial passion and entrepreneurial support programs were found to be significantly positively related to entrepreneurial intention, and entrepreneurial support programs also moderated the relationship between entrepreneurial passion and entrepreneurial intention
Originality/value: This research addresses calls for further understanding of how those with disabilities can be supported into entrepreneurship, by identifying supporting factors. The research provides further understanding of the entrepreneurial passion and intention nexus by exploring the relationship within those with a physical disability, where significant barriers exist, and within a developing country context where entrepreneurship might be a necessity rather than driven by passion.
Research limitations/implications: This research identifies that developing entrepreneurial passion and providing accessible and inclusive entrepreneurial support programs are valuable in supporting and facilitating a passage into entrepreneurship for those with disabilities
Large-scale collective motion of RFGC galaxies
We processed the data about radial velocities and HI linewidths for 1678 flat
edge-on spirals from the Revised Flat Galaxy Catalogue. We obtained the
parameters of the multipole components of large-scale velocity field of
collective non-Hubble galaxy motion as well as the parameters of the
generalized Tully-Fisher relationship in the "HI line width - linear diameter"
version. All the calculations were performed independently in the framework of
three models, where the multipole decomposition of the galaxy velocity field
was limited to a dipole, quadrupole and octopole terms respectively. We showed
that both the quadrupole and the octopole components are statistically
significant.
On the basis of the compiled list of peculiar velocities of 1623 galaxies we
obtained the estimations of cosmological parameters Omega_m and sigma_8. This
estimation is obtained in both graphical form and as a constraint of the value
S_8=sigma_8(Omega_m/0.3)^0.35 = 0.91 +/- 0.05.Comment: Accepted for publication in Astrophysics and Space Scienc
Large-scale collective motion of RFGC galaxies in curved space-time
We consider large-scale collective motion of flat edge-on spiral galaxies
from the Revised Flat Galaxy Catalogue (RFGC) taking into account the curvature
of space-time in the Local Universe at the scale 100 Mpc/h. We analyse how the
relativistic model of collective motion should be modified to provide the best
possible values of parameters, the effects that impact these parameters and
ways to mitigate them. Evolution of galactic diameters, selection effects, and
difference between isophotal and angular diameter distances are inadequate to
explain this impact. At the same time, measurement error in HI line widths and
angular diameters can easily provide such an impact. This is illustrated in a
toy model, which allows analytical consideration, and then in the full model
using Monte Carlo simulations. The resulting velocity field is very close to
that provided by the non-relativistic model of motion. The obtained bulk flow
velocity is consistent with {\Lambda}CDM cosmology.Comment: 10 pages, 3 figures, 2 table
Scaling anomaly in cosmic string background
We show that the classical scale symmetry of a particle moving in cosmic
string background is broken upon inequivalent quantization of the classical
system, leading to anomaly. The consequence of this anomaly is the formation of
single bound state in the coupling interval \gamma\in(-1,1). The inequivalent
quantization is characterized by a 1-parameter family of self-adjoint extension
parameter \omega. It has been conjectured that the formation of loosely bound
state in cosmic string background may lead to the so called anomalous
scattering cross section for the particles, which is usually seen in molecular
physics.Comment: 4 pages,1 figur
Statistical Mechanics of the Self-gravitating gas with two or more kinds of Particles
We study the statistical mechanics of the self-gravitating gas at thermal
equilibrium with two kinds of particles. We start from the partition function
in the canonical ensemble which we express as a functional integral over the
densities of the two kinds of particles for a large number of particles. The
system is shown to possess an infinite volume limit when (N_1,N_2,V)->infty,
keeping N_1/V^{1/3} and N_2/V^{1/3} fixed. The saddle point approximation
becomes here exact for (N_1,N_2,V)->infty.It provides a nonlinear differential
equation on the particle densities. For the spherically symmetric case, we
compute the densities as functions of two dimensionless physical parameters:
eta_1=G m_1^2 N_1/[V^{1/3} T] and eta_2=G m_2^2 N_2/[V^{1/3} T] (where G is
Newton's constant, m_1 and m_2 the masses of the two kinds of particles and T
the temperature). According to the values of eta_1 and eta_2 the system can be
either in a gaseous phase or in a highly condensed phase.The gaseous phase is
stable for eta_1 and eta_2 between the origin and their collapse values. The
gas is inhomogeneous and the mass M(R) inside a sphere of radius R scales with
R as M(R) propto R^d suggesting a fractal structure. The value of d depends in
general on eta_1 and eta_2 except on the critical line for the canonical ensem-
ble where it takes the universal value d simeq 1.6 for all values of N_1/N_2.
The equation of state is computed.It is found to be locally a perfect gas
equation of state. Thermodynamic functions are computed as functions of eta_1
and eta_2. They exhibit a square root Riemann sheet with the branch points on
the critical canonical line. This treatment is further generalized to the
self-gravitating gas with n-types of particles.Comment: LaTex, 29 pages, 11 .ps figures, expanded version to appear in Phys.
Rev.
Technology-Supported Storytelling (TSST) Strategy in Virtual World for Multicultural Education
Learning culture through stories is an effective way for multicultural education, since stories are one of the most powerful and personal ways that we learn about the world. Storytelling, the process of telling stories, is a form of communication and a universal expression of culture. With the development of technology, storytelling emerges out of diverse ways. This study explores the storytelling in virtual worlds for multicultural education, and devises a Technology-Supported storytelling (TSST) strategy by examining and considering the characteristics of virtual worlds which could be incorporated into the storytelling, and then uses this strategy to teach Korean culture to students with different culture background. With this innovative TSST strategy in virtual world, this study expects to provide a guide to practice for teaching multicultural in digital era
Large-Scale Power Spectrum and Structures From the ENEAR galaxy Peculiar Velocity Catalog
We estimate the mass density fluctuations power spectrum (PS) on large scales
by applying a maximum likelihood technique to the peculiarvelocity data of the
recently completed redshift-distance survey of early-type galaxies (ENEAR). The
general results are in agreement with the high amplitude power spectra found
from similar analysis of other independent all-sky catalogs of peculiar
velocity data such as MARK III and SFI. For Lambda & Open CDM COBE normalized
PS models, the best-fit parameters are confined by a contour approximately
defined by Omega h^{1.3}=0.377+-0.08 and Omega h^{0.88}=0.517+-0.083,
respectively. Gamma-shape models, free of COBE normalization, resultsin the
weak constraint of and in the rather stringent constraint of
sigma_8 Omega^{0.6}=1.0+-0.25. All quoted uncertainties refer to 3-sigma
confidence-level. The calculated PS is used as a prior for Wiener
reconstruction of the density field at different resolutions and the
three-dimensional velocity field within a volume of radius ~80 Mpc/h. All major
structures in the nearby universe are recovered and are well matched to those
predicted from all-sky redshift surveys.Comment: Submitted to MNRAS, 11 Pages, 9 figure
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