1,702 research outputs found
Heat transfer in a one-dimensional harmonic crystal in a viscous environment subjected to an external heat supply
We consider unsteady heat transfer in a one-dimensional harmonic crystal
surrounded by a viscous environment and subjected to an external heat supply.
The basic equations for the crystal particles are stated in the form of a
system of stochastic differential equations. We perform a continualization
procedure and derive an infinite set of linear partial differential equations
for covariance variables. An exact analytic solution describing unsteady
ballistic heat transfer in the crystal is obtained. It is shown that the
stationary spatial profile of the kinetic temperature caused by a point source
of heat supply of constant intensity is described by the Macdonald function of
zero order. A comparison with the results obtained in the framework of the
classical heat equation is presented. We expect that the results obtained in
the paper can be verified by experiments with laser excitation of
low-dimensional nanostructures.Comment: 12 pages, 5 figure
C-axis optical properties of high Tc cuprates
A review is given of the experimental status of the interlayer coupling
energy in the cuprates. A second c-axis plasmon is identified in the double
layer compound Y123 for various dopings. The anomalous transport properties
along the c-direction and in the planar directions are compared to model
calculations based on strongly anisotropic scattering. An excellent description
of the optical data at optimal doping is obtained if an anomalously large
anisotropy of the scattering rate between cold spots and hot spots is assumed.
This raises questions as to the physical meaning of these parameters.Comment: 4 pages, LaTeX, espcrc2.sty, 3 figures in encapsulated postscript
forma
Digital Preservation and Web Access to the Konkoly Observatory Schmidt Telescope Plate Archive
ACM Computing Classification System (1998): J.2.The digital preservation of the Konkoly Observatory Schmidt
telescope plates, as well as the web access to the plate previews, aim for
the preservation of this scientific heritage and the re-use of the astronomical
photographic plates in time domain astronomy. The photographic plates
used as detectors and information storage at astronomical observations with
the Konkoly Schmidt telescope had been obtained in the period 1962–1996.
The work on the digital plate preservation and web access started in 2001
with creation of an electronic plate catalogue and the digitization of selected
representative plates as well as with interlinking of the publishing in Konkoly
Observatory Information Bulletin on Variable Stars (IBVS) with the Wide-Field Plate Database (WFPDB) developing in Sofia. We describe the process
of the digitization of the Konkoly Schmidt telescope plates.This work is supported by the bilateral project between the Bulgarian Academy of Sciences
and the Hungarian Academy of Sciences and partially by the grants BG NSF DO-02-273 and
BG NSF DO-02-275
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