12,665 research outputs found
Comparisons of monthly mean cosmic ray counting rates observes from worldwide network of neutron monitors
In order to examine the stability of neutron monitor observation, each of the monthly average counting rates of a neutron monitors is correlated to those of Kiel neutron monitor. The regression coefficients thus obtained are compared with the coupling coefficients of isotropic intensity radiation. The results of the comparisons for five year periods during 1963 to 1982, and for whole period are given. The variation spectrum with a single power law with an exponent of -0.75 up to 50 GV is not so unsatisfactory one. More than one half of the stations show correlations with the coefficient greater than 0.9. Some stations have shifted the level of mean counting rates by changing the instrumental characteristics which can be adjusted
Interacting topological phases and modular invariance
We discuss a (2+1) dimensional topological superconductor with left-
and right-moving Majorana edge modes and a
symmetry. In the absence of interactions, these phases are distinguished by an
integral topological invariant . With interactions, the edge state in the
case is unstable against interactions, and a invariant mass gap can be generated dynamically. We show that
this phenomenon is closely related to the modular invariance of type II
superstring theory. More generally, we show that the global gravitational
anomaly of the non-chiral Majorana edge states is the physical manifestation of
the bulk topological superconductors classified by .Comment: 11 page
P04.63. The consciousness of medical doctors about collaborative practice of Western medicine and traditional Korean medicine
COMPARISON OF KNEE JOINT MONENTS DURING ANTICIPATED AND UNANTICIPATED RUNNING AND CUTTING MANEUVER - A PILOT STUDY
INTRODUCTION: Knee joint injuries are common in sports activities. Because it is understood that non-contact ACL injuries most often occur during cutting or landing tasks, biomechanical studies have examined in lower extremity kinematics. Cutting maneuvers during sporting are not always anticipated, and usually occur as a sudden reaction to an external stimulus. Therefore, the purpose of this study was to compare the joint moments in the lower extremity of females during anticipated and unanticipated running and cutting manoeuvres
Effective mass and decay of in nuclear matter in quark-meson coupling model
The in-medium mass of a \thetaplus, \mtheta^*, in cold symmetric nuclear
matter is calculated by using the quark-meson coupling model. The is
treated as an MIT bag with the quark content . Bag parameters for a
free \thetaplus are fixed to reproduce the observed mass of the \thetaplus.
In doing so, we use three different values of the -quark mass since the mass
of the -quark is not well known. As usual, the strengths of the and
quark couplings to - and -meson fields are determined to fit
the nuclear saturation properties. However, the coupling constant
between the -quark and the -meson cannot be fixed from the
saturation properties, and thus we treat as a free parameter and
investigate how \mtheta^* depends on . %\mtheta^* is calculated
up to 2.5 times the nuclear saturation density, %and we find that We find that
\mtheta^* depends significantly on the value of but not on the
mass of the -quark. Chemical potentials of the and the
system are calculated to discuss the decay of a in nuclear matter.
We calculate the effective mass of a kaon in nuclear matter in two ways; using
the optical potential of in matter and using quark model. By comparing
the effective masses calculated from these two methods, we find the magnitude
of the real part of the optical potential that is consistent with the usual
quark model is about 100 MeV.Comment: 16 pages, 4 figures, 3 table
Field-driven topological glass transition in a model flux line lattice
We show that the flux line lattice in a model layered HTSC becomes unstable
above a critical magnetic field with respect to a plastic deformation via
penetration of pairs of point-like disclination defects. The instability is
characterized by the competition between the elastic and the pinning energies
and is essentially assisted by softening of the lattice induced by a
dimensional crossover of the fluctuations as field increases. We confirm
through a computer simulation that this indeed may lead to a phase transition
from crystalline order at low fields to a topologically disordered phase at
higher fields. We propose that this mechanism provides a model of the low
temperature field--driven disordering transition observed in neutron
diffraction experiments on single crystals.Comment: 11 pages, 4 figures available upon request via snail mail from
[email protected]
Neutron stars in a perturbative gravity model with strong magnetic fields
We investigate the effect of a strong magnetic field on the structure of
neutron stars in a model with perturbative gravity. The effect of an
interior strong magnetic field of about G on the equation of
state is derived in the context of a quantum hadrodynamics (QHD) model. We
solve the modified spherically symmetric hydrostatic equilibrium equations
derived for a gravity model with . Effects of both the
finite magnetic field and the modified gravity are detailed for various values
of the magnetic field and the perturbation parameter along with a
discussion of their physical implications. We show that there exists a
parameter space of the modified gravity and the magnetic field strength, in
which even a soft equation of state can accommodate a large ( M)
maximum neutron star mass through the modified mass-radius relation
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