14,018 research outputs found
User's guide for atmospheric carbon monoxide transport model
In the winter months of Fairbanks, Alaska, a highly stable air temperature
inversion creates high levels of carbon monoxide (CO) concentrations. As an aid
to understanding this problem, a CO transport computer model has been created
which provides a useful tool when used in conjunction with other measurement and
analytic studies of traffic, meteorology, emissions control, zoning, and parking
management. The model is completely documented and illustrated with several
examples. Named ACOSP (Atmospheric CO Simulation Program), it predicts expected
CO concentrations within a specific geographic area for a defined set of CO
sources. At the present time, the model is programmed to consider automobile
emissions as the major CO source and may include estimates of stationary sources.
The model is coded for computer solution in the FORTRAN programming language and
uses the finite-element method of numerical solution of the basic convective-diffusion
equations. Although it has a potential for real-time analysis and control,
at the present time the model will be most valuable for investigating and understanding
the physical processes which are responsible for high CO levels and for
testing remedial control measures at high speed and low cost
Operational applications of NOAA-VHRR imagery in Alaska
Near-real time operational applications of NOAA satellite enhanced thermal infrared imagery to snow monitoring for river flood forecasts, and a photographic overlay technique of imagery to enhance snowcover are presented. Ground truth comparisons show a thermal accuracy of approximately + or - 1 C for detection of surface radiative temperatures. The application of NOAA imagery to flood mapping is also presented
Break-up characteristics of the Chena River watershed, central Alaska
The author has identified the following significant results. The snow melt for a small watershed (5130 sq km) in Central Alaska was successfully monitored with ERTS-1 imagery. Aerial photography was used as supporting data for periods without satellite coverage. Comparison both with actual measurements and with a computer model showed good agreement
Importance of Baryon-Baryon Coupling in Hypernuclei
The coupling in --hypernuclei and coupling in --hypernuclei produce novel
physics not observed in the conventional, nonstrange sector. Effects of
conversion in H are reviewed.
The role of coupling suppression in the
--hypernuclei due to Pauli blocking is highlighted, and the
implications for the structure of B are explored.
Suppression of conversion in He is hypothesized as the reason that the
matrix element is small. Measurement of H is
proposed to investigate the full interaction. The
implication for analog states is discussed.Comment: 17 pages LATEX, 1 figure uuencoded postscrip
The Cohomology of the Sylow 2-subgroup of the Higman-Sims Group
In this paper we compute the mod 2 cohomology of the Sylow 2-subgroup of the
Higman-Sims group HS, one of the 26 sporadic simple groups. We obtain its
Poincare series as well as an explicit description of it as a ring with 17
generators and 79 relation
Effective Widths and Effective Number of Phonons of Multiphonon Giant Resonances
We discuss the origin of the difference between the harmonic value of the
width of the multiphonon giant resonances and the smaller observed value.
Analytical expressions are derived for both the effective width and the average
cross-section. The contribution of the Brink-Axel mechanism in resolving the
discrepancy is pointed out.Comment: 9 pages, 4 figure
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