6 research outputs found
Magnetically Stabilized Luminescent Excitations in Hexagonal Boron Nitride
Magnetically stabilized luminescence is observed in hexagonal boron nitride.
The luminescence is induced by absorption of cold neutrons and is in the
visible region. In the absence of a magnetic field, the photon emission level
is observed to decay over several hundred seconds. A fraction of this
luminescence can be suppressed if the temperature is T <~ 0.6 K and the
magnetic field is B >~ 1.0 T. Subsequent to irradiation and suppression,
luminescence can be induced by an increase in T or lowering of B. Possible
explanations include stabilization of triplet states or the localization and
stabilization of excitons.Comment: 11 pages, 7 figures, to appear in the Journal of Luminescenc
Comparison between three-dimensional linear and nonlinear tsunami generation models
The modeling of tsunami generation is an essential phase in understanding
tsunamis. For tsunamis generated by underwater earthquakes, it involves the
modeling of the sea bottom motion as well as the resulting motion of the water
above it. A comparison between various models for three-dimensional water
motion, ranging from linear theory to fully nonlinear theory, is performed. It
is found that for most events the linear theory is sufficient. However, in some
cases, more sophisticated theories are needed. Moreover, it is shown that the
passive approach in which the seafloor deformation is simply translated to the
ocean surface is not always equivalent to the active approach in which the
bottom motion is taken into account, even if the deformation is supposed to be
instantaneous.Comment: 39 pages, 16 figures; Accepted to Theoretical and Computational Fluid
Dynamics. Several references have been adde