12,823 research outputs found
Diurnal variations from muon data at Takeyama underground station
An underground station, Takeyama, is introduced, and some results of the solar diurnal and semi-diurnal variations for the period between 1967 and 1984 are presented. There are clear tendencies of double and single solar cycle variations in the daily variations which are in good accord with those detected by other underground and neutron monitor observations
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Laser Sintering of Stainless Steel using Resin Powder
We tried laser sintering of 316L stainless steel powder using resin powder. The laser
sintering conditions such as laser power, scan speed and scan pitch with a YAG laser, and the
influence of additional resin powder on the density and the tensile properties of the sintered alloy
were investigated experimentally. The tensile specimen was laser-sintered with a YAG laser, and
then debound and sintered in a vacuum furnace. The tensile specimen was successfully fabricated.
The relative density and the tensile strength varied with the additional resin powder, and the
optimum weight percentage of additional resin powder was around 4%.The relative density of the
sintered alloy was approximately 85%, and the tensile strength and elongation of the sintered
alloy were more than 280 MPa and 15% respectively.Mechanical Engineerin
Entropic Inequalities for a Class of Quantum Secret Sharing States
It is well-known that von Neumann entropy is nonmonotonic unlike Shannon
entropy (which is monotonically nondecreasing). Consequently, it is difficult
to relate the entropies of the subsystems of a given quantum state. In this
paper, we show that if we consider quantum secret sharing states arising from a
class of monotone span programs, then we can partially recover the monotonicity
of entropy for the so-called unauthorized sets. Furthermore, we can show for
these quantum states the entropy of the authorized sets is monotonically
nonincreasing.Comment: LaTex, 5 page
Supersymmetry-Breaking Nonlinear Sigma Models
We consider a novel class of constraints on chiral superfields to obtain
supersymmetric nonlinear sigma models in four spacetime dimensions, which
strictly combine the internal symmetry breaking with spontaneous supersymmetry
breaking. The resultant massless modes can be exclusively Nambu-Goldstone
bosons without their complex partners and the goldstino that is charged under
the internal symmetry. The massive modes show a peculiar relation among their
masses and the scales of symmetry breakings.Comment: 9 pages, comments and references adde
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