35,940 research outputs found
Formation of \eta'(958)-mesic nuclei and axial U_A(1) anomaly at finite density
We discuss the possibility to produce the bound states of the
meson in nuclei theoretically. We calculate the formation cross sections of the
bound states with the Green function method for (,p) reaction
and discuss the experimental feasibility at photon facilities like SPring-8. We
conclude that we can expect to observe resonance peaks in (,p) spectra
for the formation of bound states and we can deduce new information on
properties at finite density. These observations are believed to be
essential to know the possible mass shift of and deduce new information
of the effective restoration of the chiral anomaly in the nuclear
medium.Comment: 4 pages, 3 figure
Implementation of Lees-Edwards periodic boundary conditions for direct numerical simulations of particle dispersions under shear flow
A general methodology is presented to perform direct numerical simulations of
particle dispersions in a shear flow with Lees-Edwards periodic boundary
conditions. The Navier-Stokes equation is solved in oblique coordinates to
resolve the incompatibility of the fluid motions with the sheared geometry, and
the force coupling between colloidal particles and the host fluid is imposed by
using a smoothed profile method. The validity of the method is carefully
examined by comparing the present numerical results with experimental viscosity
data for particle dispersions in a wide range of volume fractions and shear
rates including nonlinear shear-thinning regimes
Plane-stress, elastic-plastic states in the vicinity of crack tips
Plane stress analysis of elastic-plastic states in vicinity of straight crack tip in thin plat
Invasive Weeds, Wildfire, and Rancher Decision Making in the Great Basin
In this article, a numerical stochastic dynamic programming model (SDP) is developed to characterize the decision problem of a rancher operating on rangelands in northern Nevada that are affected by invasive annual grasses and wildfire. The model incorporates decisions about herd size management of a cow-calf operation and fuels treatment to reduce the size of rangeland wildfires. Currently, high transactions costs to obtain permits to implement land treatments on federally-owned rangelands appear to limit rancher involvement. The results of the model suggest that ranch income motives alone are likely insufficient for private ranchers to adopt preventative land treatments. The current treatment cost ($20 per acre at the minimum) appears to be prohibitively expensive relative to the benefits derived from the treatments under the low-productivity, semi-arid rangeland conditions.stochastic dynamic programming, cow-calf operation, rangeland, ecosystem, Livestock Production/Industries, Resource /Energy Economics and Policy,
Stability and Hermitian-Einstein metrics for vector bundles on framed manifolds
We adapt the notions of stability of holomorphic vector bundles in the sense
of Mumford-Takemoto and Hermitian-Einstein metrics in holomorphic vector
bundles for canonically polarized framed manifolds, i.e. compact complex
manifolds X together with a smooth divisor D such that K_X \otimes [D] is
ample. It turns out that the degree of a torsion-free coherent sheaf on X with
respect to the polarization K_X \otimes [D] coincides with the degree with
respect to the complete K\"ahler-Einstein metric g_{X \setminus D} on X
\setminus D. For stable holomorphic vector bundles, we prove the existence of a
Hermitian-Einstein metric with respect to g_{X \setminus D} and also the
uniqueness in an adapted sense.Comment: 21 pages, International Journal of Mathematics (to appear
Coexistence of distinct charge fluctuations in -(BEDT-TTF)X
Using the Lanczos exact-diagonalization and density-matrix renormalization
group methods, we study the extended Hubbard model at quarter filling defined
on the anisotropic triangular lattice. We focus on charge ordering (CO)
phenomena induced by onsite and intersite Coulomb interactions. We determine
the ground-state phase diagram including three CO phases, i.e., diagonal,
vertical, and three-fold CO phases, based on the calculated results of the hole
density and double occupancy. We also calculate the dynamical density-density
correlation functions and find possible coexistence of the diagonal and
three-fold charge fluctuations in a certain parameter region where the onsite
and intersite interactions compete. Furthermore, the characteristic features of
the optical conductivity for each CO phase are discussed.Comment: 9 pages, 7 figure
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