41,706 research outputs found
Effect of load introduction on graphite epoxy compression specimens
Compression testing of modern composite materials is affected by the manner in which the compressive load is introduced. Two such effects are investigated: (1) the constrained edge effect which prevents transverse expansion and is common to all compression testing in which the specimen is gripped in the fixture; and (2) nonuniform gripping which induces bending into the specimen. An analytical model capable of quantifying these foregoing effects was developed which is based upon the principle of minimum complementary energy. For pure compression, the stresses are approximated by Fourier series. For pure bending, the stresses are approximated by Legendre polynomials
Lepton flavor violating decays induced by scalar unparticle
We study the radiative lepton flavor violating l_i -> l_j \gamma\gamma decays
in the case that the lepton flavor violation is induced by the scalar
unparticle mediation. We restrict the scaling dimension d_u and the scalar
unparticle-photon-photon coupling by using the experimental upper limit of the
branching ratio of the decay \mu -> e \gamma\gamma. Furthermore, we predict the
BRs of the other radiative decays by using the restrictions we get. We observe
that the measurements of upper limits of BRs of these decays ensure
considerable information for testing the possible signals coming from
unparticle physicsComment: 10 pages, 5 figures, 1 tabl
The XYZs of Charmonium at BES
This contribution reviews some recent developments in charmonium
spectroscopy, and discusses related theoretical predictions. The spectrum of
states, strong decays of states above open charm threshold, electromagnetic
transitions, and issues related to the recent discoveries of the "XYZ" states
are discussed. Contributions that BES can make to our understanding of
charmonium and related states are stressed in particular.Comment: 5 pages, 1 eps figure. Invited contribution to the International
Workshop on Tau-Charm Physics Charm2006 (5-7 June 2006, Beijing, China
Relativistic Mean-Field and Beyond Approaches for Deformed Hypernuclei
We report the recent progress in relativistic mean-field (RMF) and beyond
approaches for the low-energy structure of deformed hypernuclei. We show that
the hyperon with orbital angular momentum (or )
generally reduces (enhances) nuclear quadrupole collectivity. The beyond
mean-field studies of hypernuclear low-lying states demonstrate that there is
generally a large configuration mixing between the two components and in the hypernuclear states. The mixing weight
increases as the collective correlation of nuclear core becomes stronger.
Finally, we show how the energies of hypernuclear low-lying states are
sensitive to parameters in the effective interaction, the
uncertainty of which has a large impact on the predicted maximal mass of
neutron stars.Comment: 12 pages, 7 figures. A plenary talk given at the 13th International
Conference on Hypernuclear and Strange Particle Physics, June 24-29, 2018,
Portsmouth, V
Disappearance of nuclear deformation in hypernuclei: a perspective from a beyond-mean-field study
The previous mean-field calculation [Myaing Thi Win and K. Hagino, Phys. Rev.
C{\bf 78}, 054311 (2008)] has shown that the oblate deformation in
Si disappears when a particle is added to these nuclei.
We here investigate this phenomenon by taking into account the effects beyond
the mean-field approximation. To this end, we employ the microscopic
particle-rotor model based on the covariant density functional theory. We show
that the deformation of Si does not completely disappear, even though it
is somewhat reduced, after a particle is added if the
beyond-mean-field effect is taken into account. We also discuss the impurity
effect of particle on the electric quadrupole transition, and show
that an addition of a particle leads to a reduction in the
value, as a consequence of the reduction in the deformation parameter.Comment: 6 pages, 5 figures. The version to appear in Phys. Rev.
Properties of Scalar-Quark Systems in SU(3)c Lattice QCD
We perform the first study for the bound states of colored scalar particles
("scalar quarks") in terms of mass generation with quenched SU(3)
lattice QCD. We investigate the bound states of , and
("scalar-quark hadrons"), as well as the bound states of
and quarks , i.e., , and
("chimera hadrons"). All these new-type hadrons including have a large
mass of several GeV due to large quantum corrections by gluons, even for zero
bare scalar-quark mass at . We find a similar
-dependence between and , which
indicates their similar structure due to the large mass of . From this
study, we conjecture that all colored particles generally acquire a large
effective mass due to dressed gluons
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