1,278 research outputs found
Sir William Edward Parry
Contains a biography, originally prepared for Stefansson's Encyclopedia Arctica, of this British explorer: his early life, polar explorations and later government positions not related to the Arctic. His five northern expeditions are cited: that with Capt. John Ross in 1818, those he commanded in 1819-20, 1821-23, and 1824-25; his discoveries (several water bodies and islands) in the Canadian Arctic Archipelago, and his last expedition, in 1827, an attempt to reach the North Pole over the pack or through open water from Spitsbergen
Status of Policies on HIV/AIDS: Responses of Nebraska Postsecondary Institutions with Health Occupations Programs
This study was conducted to assess the status of HIV/AIDS policies in postsecondary health occupations programs in Nebraska. The purposes of the study were to determine which postsecondary health occupations education programs had policies adequate to address HIV/AIDS, and to review a copy of the programâs policies for agreement with a set of criteria developed from those recommended by the Centers for Disease Control and the American College Health Association. Results revealed that the institutionsâ policies submitted for review did not meet the criteria developed for the study
On Epsilon Expansions of Four-loop Non-planar Massless Propagator Diagrams
We evaluate three typical four-loop non-planar massless propagator diagrams
in a Taylor expansion in dimensional regularization parameter
up to transcendentality weight twelve, using a recently
developed method of one of the present coauthors (R.L.). We observe only
multiple zeta values in our results.Comment: 3 pages, 1 figure, results unchanged, discussion improved, to appear
in European Physical Journal
The Christiansen Effect in Saturn's narrow dusty rings and the spectral identification of clumps in the F ring
Stellar occultations by Saturn's rings observed with the Visual and Infrared
Mapping Spectrometer (VIMS) onboard the Cassini spacecraft reveal that dusty
features such as the F ring and the ringlets in the Encke and the Laplace Gaps
have distinctive infrared transmission spectra. These spectra show a narrow
optical depth minimum at wavelengths around 2.87 microns. This minimum is
likely due to the Christiansen Effect, a reduction in the extinction of small
particles when their (complex) refractive index is close to that of the
surrounding medium. Simple Mie-scattering models demonstrate that the strength
of this opacity dip is sensitive to the size distribution of particles between
1 and 100 microns across. Furthermore, the spatial resolution of the
occultation data is sufficient to reveal variations in the transmission spectra
within and among these rings. For example, in both the Encke Gap ringlets and F
ring, the opacity dip weakens with increasing local optical depth, which is
consistent with the larger particles being concentrated near the cores of these
rings. The strength of the opacity dip varies most dramatically within the F
ring; certain compact regions of enhanced optical depth lack an opacity dip and
therefore appear to have a greatly reduced fraction of grains in the few-micron
size range.Such spectrally-identifiable structures probably represent a subset
of the compact optically-thick clumps observed by other Cassini instruments.
These variations in the ring's particle size distribution can provide new
insights into the processes of grain aggregation, disruption and transport
within dusty rings. For example, the unusual spectral properties of the F-ring
clumps could perhaps be ascribed to small grains adhering onto the surface of
larger particles in regions of anomalously low velocity dispersion.Comment: 42 pages, 15 figures, accepted for publication in Icarus. A few small
typographical errors fixed to match correction in proof
Structure of the Coulomb and unitarity corrections to the cross section of pair production in ultra-relativistic nuclear collisions
We analyze the structure of the Coulomb and unitarity corrections to the
single pair production as well as the cross section for the multiple pair
production. In the external field approximation we consider the probability of
pair production at fixed impact parameter between colliding
ultra-relativistic heavy nuclei. We obtain the analytical result for this
probability at large as compared to the electron Compton wavelength. We
estimate also the unitary corrections to the total cross section of the
process.Comment: 10 pages, 2 figures, RevTeX, references correcte
Lepton Flavor Violating Z Decays in the Zee Model
We calculate lepton flavor violating (LFV) Z decays Z \to {{e_i^\pm}}e_j^\mp
(i, j = e, \mu, \tau ; i\neq j) in the Zee model keeping in view the radiative
leptonic decays e_i\to e_j\gamma (i = \mu, \tau ; j = e, \mu ; i\neq j), \mu
decay and anomalous muon magnetic moment (\mu AMM). We investigate three
different cases of Zee f_{ij} coupling (A) f_{e\mu}^2 = f_{\mu\tau}^2= f_{\tau
e}^2, (B) f_{e\mu}^2 \gg f_{\tau e}^2 \gg f_{\mu\tau}^2, and (C) f_{\mu\tau}^2
\gg f_{e\mu}^2 \gg f_{\tau e}^2 subject to the neutrino phenomenology.
Interestingly, we find that, although the case (C) satisfies the large excess
value of \mu AMM, however, it is unable to explain the solar neutrino
experimental result, whereas the case (B) satisfies the bi-maximal neutrino
mixing scenario, but confronts with the result of \mu AMM experiment. We also
find that among all the three cases, only the case (C) gives rise to largest
contribution to the ratio B(Z\to e^\pm\tau^\mp)/B(Z\to \mu^\pm \mu^\mp) \simeq
{10}^{-8} which is still two order less than the accessible value to be probed
by the future linear colliders, whereas for the other two cases, this ratio is
too low to be observed even in the near future for all possible LFV Z decay
modes.Comment: 12 pages, RevTex, 2 figures, 3 Tables, typos corrected, reference
added, version to appear in Phys. Rev.
Field theory models for variable cosmological constant
Anthropic solutions to the cosmological constant problem require seemingly
unnatural scalar field potentials with a very small slope or domain walls
(branes) with a very small coupling to a four-form field. Here we introduce a
class of models in which the smallness of the corresponding parameters can be
attributed to a spontaneously broken discrete symmetry. We also demonstrate the
equivalence of scalar field and four-form models. Finally, we show how our
models can be naturally embedded into a left-right extension of the standard
model.Comment: A reference adde
An SO(10)XS-4 Scenario for Naturally Degenerate Neutrinos
The simplest scenario for the three known light neutrinos that fits the solar
and atmospheric neutrino deficit and a mixed dark matter (MDM) picture of the
universe requires them to be highly degenerate with 1 - 2 eV. We
propose an SO(10) grand unified model with an S-horizontal symmetry that
leads naturally to such a scenario.
An explicit numerical analysis of the quark and lepton sector of the model
shows that it can lead to desired mass differences to fit all data only for the
small angle non-adiabatic MSW solution to the solar neutrino puzzle.Comment: UMD-PP-94-95; (Latex file; 1 figure available on request
Pseudoscalar pole terms contributions to hadronic light-by-light corrections to the muonium hyperfine splitting
The contribution of pseudoscalar pole diagrams to the hadronic light-by-light
corrections of order alpha^3 E_F to the ground state hyperfine splitting in
hydrogenic atom is calculated in the pseudoscalar pole terms approximation. The
vector dominance model for the form factor of the transition of a pseudoscalar
meson into two photons is used. With the account of new experimental data on
the cross sections sigma (e^+e^-\to \rho, \omega \to \pi^0(\eta)\gamma) in the
SND and CMD-2 experiments some other hadronic corrections to the muonium
hyperfine splitting are calculated.Comment: 7 pages, REVTEX, 5 figure
Exchange anisotropy, disorder and frustration in diluted, predominantly ferromagnetic, Heisenberg spin systems
Motivated by the recent suggestion of anisotropic effective exchange
interactions between Mn spins in GaMnAs (arising as a result of
spin-orbit coupling), we study their effects in diluted Heisenberg spin
systems. We perform Monte Carlo simulations on several phenomenological model
spin Hamiltonians, and investigate the extent to which frustration induced by
anisotropic exchanges can reduce the low temperature magnetization in these
models and the interplay of this effect with disorder in the exchange. In a
model with low coordination number and purely ferromagnetic (FM) exchanges, we
find that the low temperature magnetization is gradually reduced as exchange
anisotropy is turned on. However, as the connectivity of the model is
increased, the effect of small-to-moderate anisotropy is suppressed, and the
magnetization regains its maximum saturation value at low temperatures unless
the distribution of exchanges is very wide. To obtain significant suppression
of the low temperature magnetization in a model with high connectivity, as is
found for long-range interactions, we find it necessary to have both
ferromagnetic and antiferromagnetic (AFM) exchanges (e.g. as in the RKKY
interaction). This implies that disorder in the sign of the exchange
interaction is much more effective in suppressing magnetization at low
temperatures than exchange anisotropy.Comment: 9 pages, 8 figure
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