1,683 research outputs found
Pointwise estimates for the Bergman kernel of the weighted Fock space
We prove upper pointwise estimates for the Bergman kernel of the weighted
Fock space of entire functions in where is a
subharmonic function with a doubling measure. We derive estimates
for the canonical solution operator to the inhomogeneous Cauchy-Riemann
equation and we characterize the compactness of this operator in terms of
Electronic Raman scattering in YBCO and other superconducting cuprates
Superconductivity induced structures in the electronic Raman spectra of
high-Tc superconductors are computed using the results of ab initio LDA-LMTO
three-dimensional band structure calculations via numerical integrations of the
mass fluctuations, either in the whole 3D Brillouin zone or limiting the
integrations to the Fermi surface. The results of both calculations are rather
similar, the Brillouin zone integration yielding additional weak structures
related to the extended van Hove singularities. Similar calculations have been
performed for the normal state of these high-Tc cuprates. Polarization
configurations have been investigated and the results have been compared to
experimental spectra. The assumption of a simple d_(x^2-y^2)-like gap function
allows us to explain a number of experimental features but is hard to reconcile
with the relative positions of the A1g and B1g peaks.Comment: 14 pages, LaTeX (RevTeX), 5 PostScript figures, uses multicol.sty,
submitted to PR
Itraconazole Induced Torsade De Pointes in a Patient Receiving Methadone Substitution Therapy
Heat-kernel coefficients for oblique boundary conditions
We calculate the heat-kernel coefficients, up to , for a U(1) bundle on
the 4-Ball for boundary conditions which are such that the normal derivative of
the field at the boundary is related to a first-order operator in boundary
derivatives acting on the field. The results are used to place restrictions on
the general forms of the coefficients. In the specific case considered, there
can be a breakdown of ellipticity.Comment: 9 pages, JyTeX. One reference added and minor corrections mad
Spectroscopy and dissociative recombination of the lowest rotational states of H3+
The dissociative recombination of the lowest rotational states of H3+ has
been investigated at the storage ring TSR using a cryogenic 22-pole
radiofrequency ion trap as injector. The H3+ was cooled with buffer gas at ~15
K to the lowest rotational levels, (J,G)=(1,0) and (1,1), which belong to the
ortho and para proton-spin symmetry, respectively. The rate coefficients and
dissociation dynamics of H3+(J,G) populations produced with normal- and para-H2
were measured and compared to the rate and dynamics of a hot H3+ beam from a
Penning source. The production of cold H3+ rotational populations was
separately studied by rovibrational laser spectroscopy using chemical probing
with argon around 55 K. First results indicate a ~20% relative increase of the
para contribution when using para-H2 as parent gas. The H3+ rate coefficient
observed for the para-H2 source gas, however, is quite similar to the H3+ rate
for the normal-H2 source gas. The recombination dynamics confirm that for both
source gases, only small populations of rotationally excited levels are
present. The distribution of 3-body fragmentation geometries displays a broad
part of various triangular shapes with an enhancement of ~12% for events with
symmetric near-linear configurations. No large dependences on internal state or
collision energy are found.Comment: 10 pages, 9 figures, to be published in Journal of Physics:
Conference Proceeding
First Annual Report of the ICRISAT Research Program May 1972-March 1973
First Annual Report of the ICRISA
Environmental controls on the stable isotopic composition of Mercenaria mercenaria: Potential application to paleoenvironmental studies
Effect of nitrogen level and spacing on sorghum intercropped with pigeonpea and greengram in semi-arid lands
On rainfed lands at Rajendranagar and Patanchrru, both in Hyderabad, Andhra Pradesh, sorghum [Sorghum bicolor (Linn.)Moench.] sjowed a marked response to applied N both under sole cropping and intercropplng with pigeonpea [Cajanus cajan (Linn.) Millsp.] or greengram [Vigna rodiata (Linn.) Wilczek] but the response decreased with an increase in
the N level (0.40 and 80 kg/ha)..
Electronic Raman-scattering study of low-energy excitations in single and double CuO_2-layer Tl-Ba-(Ca)-Cu-O superconductors
Low energy Raman continuum and the redistribution of the continuum to a peak
(2\Delta-peak) in the superconducting state have been studied in
Tl-Ba-(Ca)-Cu-O superconductors with single (Tl-2201) and double (Tl-2212)
CuO_2 layer. The 2\Delta/k_BT_c ratios in A_1g and B_1g symmetries are larger
for Tl-2212 than for Tl-2201. The B_1g/A_1g gap ratio is also larger in
Tl-2212. The A_1g intensities of the continuum and the 2\Delta-peak are
significantly weaker than the B_1g intensities in Tl-2201, but are comparable
in Tl-2212. This shows that the Coulomb screening is much stronger in Tl-2201.
The change from Tl-2201 to Tl-2212 of the normalized A_1g 2\Delta-peak
intensity is identical within experimental error to that of normalized A_1g
continuum intensity. This suggests that the excitations forming the
2\Delta-peak and the continuum couple to light by the same mechanism.Comment: 4 pages, PDF forma
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