2,106 research outputs found
Failure criterion of glass fabric reinforced plastic laminates
Failure criteria are derived for several modes of failure (in unaxial tensile or compressive loading, or biaxial combined tensile-compressive loading) in the case of closely woven plain fabric, coarsely-woven plain fabric, or roving glass cloth reinforcements. The shear strength in the interaction formula is replaced by an equation dealing with tensile or compressive strength in the direction making a 45 degree angle with one of the anisotropic axes, for the uniaxial failure criteria. The interaction formula is useful as the failure criterion in combined tension-compression biaxial failure for the case of closely woven plain fabric laminates, but poor agreement is obtained in the case of coarsely woven fabric laminates
Superconducting Gap Function in Antiferromagnetic Heavy-Fermion UPd_2Al_3 Probed by Angle Resolved Magnetothermal Transport Measurements
The superconducting gap structure of heavy fermion UPd_2Al_3, in which
unconventional superconductivity coexists with antiferromagnetic (AF) order
with atomic size local moments, was investigated by the thermal conductivity
measurements in a magnetic field rotating in various directions relative to the
crystal axes. The results provide strong evidence that the gap function
\Delta(k) has a single line node orthogonal to the c-axis located at the AF
Brillouin zone boundary, while \Delta(k) is isotropic within the basal plane.
The determined nodal structure is compatible with the resonance peak in the
dynamical susceptibility observed in neutron inelastic scattering experiments.
Based on these results, we conclude that the superconducting pairing function
of UPd_2Al_3 is most likely to be d-wave with a form \Delta(k)=\Delta_0
cos(k_zc)Comment: 10 pages, 9 figure
Magnetic Properties of a Pressure-induced Superconductor UGe
We performed the DC-magnetization and neutron scattering experiments under
pressure {\it P} for a pressure-induced superconductor UGe. We found that
the magnetic moment is enhanced at a characteristic temperature {\it T}
in the ferromagnetic state, where {\it T} is smaller than a Curie
temperature {\it T}. This enhancement becomes remarkable in the
vicinity of {\it P} = 1.20 GPa, where {\it T} becomes 0 K
and the superconducting transition temperature {\it T} shows a
maximum. The characteristic temperature {\it T}, which decreases with
increasing pressure, also depends on the magnetic field.Comment: To be published in J.Phys.Soc.Jp
Limb-Brightened Jet of 3C 84 Revealed by the 43-GHz Very-Long-Baseline-Array Observation
We present a study of sub-pc scale radio structure of the radio galaxy 3C
84/NGC 1275 based on the Very Long Baseline Array (VLBA) data at 43 GHz. We
discover a limb-brightening in the "restarted" jet associated with the 2005
radio outburst. In the 1990s, the jet structure was ridge-brightening rather
than limb-brightening, despite the observations being done with similar angular
resolution. This indicates that the transverse jet structure has changed
recently. This change in the morphology shows an interesting agreement with the
-ray flux increase, i.e., the -ray flux in 1990s was at least
seven times lower than the current one. One plausible explanation for the
limb-brightening is the velocity structure of the jet in the context of the
stratified jet, which is a successful scenario to explain the -ray
emission in some active galactic nuclei (AGNs). If this is the case, the change
in apparent transverse structure might be caused by the change in the
transverse velocity structure. We argue the possibility that the transition
from ridge-brightening to limb-brightening is related to the -ray time
variability on the timescale of decades. We also discuss the collimation
profile of the jet.Comment: 22 pages, 4 figures, Accepted for Publication in Ap
Pressure-induced Superconductivity in a Ferromagnet UGe -- Resistivity Measurements in Magnetic Field --
The electrical resistivity measurements in the magnetic field are carried out
on the pressure-induced superconductor UGe. The superconductivity is
observed from 1.06 to 1.44 GPa. The upper critical field of is
anisotropic where exhibits positive curvature for and
-axis. The characteristic enhancement of is reconfirmed for
-axis. In the temperature and field dependence of resistivity at where the ferromagnetic ordering disappears, it is observed that the
application of the external field along the {\it a}-axis increases the
coefficient of Fermi liquid behavior correspondingly to the
metamagnetic transition.Comment: To be published in the proceeding of the International Conference on
High Pressure Science and Technology(AIRAPT-18),Beijing,China,23-27 July 200
Land use inventory through merging of LANDSAT (satellite), aerial photography and map sources
There are no author-identified significant results in this report
Thermal transport in the hidden-order state of URuSi
We present a study of thermal conductivity in the normal state of the
heavy-fermion superconductor URuSi. Ordering at 18K leads to a
steep increase in thermal conductivity and (in contrast with all other cases of
magnetic ordering in heavy-fermion compounds) to an enhancement of the Lorenz
number. By linking this observation to several other previously reported
features, we conclude that most of the carriers disappear in the ordered state
and this leads to a drastic increase in both phononic and electronic
mean-free-path.Comment: 5 pages including 4 figure
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