1,346,074 research outputs found
Auditing scholarly journals published in Malaysia and assessing their visibility
The problem with the identification of Malaysian scholarly journals lies in
the lack of a current and complete listing of journals published in Malaysia.
As a result, librarians are deprived of a tool that can be used for journal
selection and identification of gaps in their serials collection. This study
describes the audit carried out on scholarly journals, with the objectives (a)
to trace and characterized scholarly journal titles published in Malaysia, and
(b) to determine their visibility in international and national indexing
databases. A total of 464 titles were traced and their yearly trends, publisher
and publishing characteristics, bibliometrics and indexation in national,
international and subject-based indexes were described
Proton-neutron symmetry in 92Zr, 94Mo with Skyrme interactions in a separable approximation
Starting from a Skyrme interaction we study the properties of the low-energy
spectrum of quadrupole excitations in 90,92Zr, 92,94Mo. The coupling between
one- and two-phonon terms in the wave functions of excited states are taken
into account. We use the finite-rank separable approximation which enables one
to perform the QRPA calculations in very large two-quasiparticle spaces. Our
results from the SGII Skyrme interaction in connection with the volume pairing
interaction are in reasonable agreement with experimental data. In particular,
we present the successful description of the M1 transition between low-energy
quadrupole excitations.Comment: 9 pages, 3 figure
Dunkl operators at infinity and Calogero-Moser systems
We define the Dunkl and Dunkl-Heckman operators in infinite number of
variables and use them to construct the quantum integrals of the
Calogero-Moser-Sutherland problems at infinity. As a corollary we have a simple
proof of integrability of the deformed quantum CMS systems related to classical
Lie superalgebras. We show how this naturally leads to a quantum version of the
Moser matrix, which in the deformed case was not known before.Comment: 22 pages. Corrected version with minor change
Seasonal Change of the Ozone Layer State over Yakutia
The ozone layer state in the stratosphere over Yakutia depending on the year
time is considered. It is shown that the layer thickness is maximum in
February-March (450 Dobson's units) and it is minimum in July-September (300 -
350 DU). Measurements indicate that the ozone layer thickness was significantly
decreased in the 1990's. A problem of change of ozone layer state is discussed.Comment: 3 pages, 2 figure
Fermi-liquid theory of the surface impedance of a metal in a normal magnetic field
In this paper we present detailed theoretical analysis of the frequency
and/or magnetic field dependence of the surface impedance of a metal at the
anomalous skin effect. We calculate the surface impedance in the presence of a
magnetic field directed along the normal to the metal surface. The effects of
the Fermi-liquid interactions on the surface impedance are studied. It is shown
that the cyclotron resonance in a normal magnetic field may be revealed {\it
only and exclusively} in such metals whose Fermi surfaces include segments
where its Gaussian curvature turns zero. The results could be applied to
extract extra informations concerning local anomalies in the Fermi surface
curvature in conventional and quasi-two-dimensional metals.Comment: 10 pages, 1 figure, text added and rearranged, computational details
are moved into Appendice
De Sitter Breaking through Infrared Divergences
Just because the propagator of some field obeys a de Sitter invariant
equation does not mean it possesses a de Sitter invariant solution. The classic
example is the propagator of a massless, minimally coupled scalar. We show that
the same thing happens for massive scalars with , and for massive
transverse vectors with , where is the dimension
of spacetime and is the Hubble parameter. Although all masses in these
ranges give infrared divergent mode sums, using dimensional regularization (or
any other analytic continuation technique) to define the mode sums leads to the
incorrect conclusion that de Sitter invariant solutions exist except at
discrete values of the masses.Comment: 27 pages, no figures, uses LaTeX 2epsilo
Deformed quantum Calogero-Moser problems and Lie superalgebras
The deformed quantum Calogero-Moser-Sutherland problems related to the root
systems of the contragredient Lie superalgebras are introduced. The
construction is based on the notion of the generalized root systems suggested
by V. Serganova. For the classical series a recurrent formula for the quantum
integrals is found, which implies the integrability of these problems. The
corresponding algebras of the quantum integrals are investigated, the explicit
formulas for their Poincare series for generic values of the deformation
parameter are presented.Comment: 30 pages, 1 figur
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