7,533 research outputs found
Some Effects of Wing Planform on Sonic Boom
A wind-tunnel investigation was conducted to determine the effect of wing planform on sonic boom at Mach numbers of 1.7, 2.0, and 2.7. The results of the investigation show that the wing leading-edge sweep is one of the primary planform variables affecting the overpressure characteristics
OH Maser sources in W49N: probing differential anisotropic scattering with Zeeman pairs
Our analysis of a VLBA 12-hour synthesis observations of the OH masers in
W49N has provided detailed high angular-resolution images of the maser sources,
at 1612, 1665 and 1667 MHz. The images, of several dozens of spots, reveal
anisotropic scatter broadening; with typical sizes of a few tens of
milli-arc-seconds and axial ratios between 1.5 to 3. The image position angles
oriented perpendicular to the galactic plane are interpreted in terms of
elongation of electron-density irregularities parallel to the galactic plane,
due to a similarly aligned local magnetic field. However, we find the apparent
angular sizes on the average a factor of 2.5 less than those reported by Desai
et al., indicating significantly less scattering than inferred earlier. The
average position angle of the scattered broadened images is also seen to
deviate significantly (by about 10 degrees) from that implied by the magnetic
field in the Galactic plane. More intriguingly, for a few Zeeman pairs in our
set, we find significant differences in the scatter broadened images for the
two hands of polarization, even when apparent velocity separation is less than
0.1 km/s. Here we present the details of our observations and analysis, and
discuss the interesting implications of our results for the intervening
anisotropic magneto-ionic medium, as well as a comparison with the expectations
based on earlier work.Comment: 5 pages, 3 figures, submitted to the Proceedings of the IAU Symposium
287: "Cosmic masers - from OH to H0
Aggregate Corn Area Response Under Risk: Some Implications for Price Stabilization Programs
Investigation of the corn revenue risk of Filipino farmers indicates their vulnerability to wide variability in domestic and world prices. Given the imperfect market and heavy dependence of farmers on trader’s price information, it is important to incorporate risk in any modeling attempts on the farmers’ cultivation areas.stabilization program, rice commodities, rice farm, corn and corn products, risk
Exclusive W^+ + photon production in proton-antiproton collisions II: results
We present results for total cross sections, single and double differential
distributions and correlations between pairs of outgoing particles in the
reactions p + antip --> W^+ + photon and p + antip --> W^+ + photon + jet at
sqrt(S)=1.8 TeV. Order alpha-strong QCD corrections and leading logarithm
photon bremsstrahlung contributions are included in the MS-bar mass
factorization scheme for three experimental scenarios: 1) 2-body inclusive
production of W^+ and photon, 2) exclusive production of W^+, photon and 1 jet
and 3) exclusive production of W^+ and photon with 0 jet.
The latest CTEQ parton distribution functions, which fit the newly released
HERA data, are used in our analysis. The dependence of our results on the mass
factorization scale is used to place error bars on our predictions for the
single differential distributions and correlations.Comment: 15 pages (LateX). 50 pages of postscript figures available via ftp
anonymous from max.physics.sunysb.edu in the directory
preprints/mendoza/EXCLUSIVE_W_GAMMA_II.dir (files named fig_*.ps)
ITP-SB-93-80. ([email protected])([email protected]
Some effects of Mach number and geometry on sonic boom
Mach number and geometry effects on level of sonic boom overpressure and applicability of Whitham theory to calculation of sonic boo
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