128,789 research outputs found
Cloud-free resolution element statistics program
Computer program computes number of cloud-free elements in field-of-view and percentage of total field-of-view occupied by clouds. Human error is eliminated by using visual estimation to compute cloud statistics from aerial photographs
Amplitudes and Resonances from an Energy-Dependent Analysis of pbar+p -> pi+pi
The amplitudes at a series of discrete energies obtained from a previuos
analysis of pbar+p -> pi+pi have been used as input to a global energy-
dependent analysis of data in the momentum range 360 - 1550 MeV/c. The results
confirm the previous analysis and yield refined values for meson resonance
parameters in this energy region.Comment: 8 pages, LaTex, 2 postscript figures, a reference is correcte
Feasibility study of LITVC for shuttle SRB
A liquid injection thrust vector control (LITVC) system for the shuttle solid rocket booster (SRB) was analyzed. The LITVC was compared with the SRB baseline flexible seal. A table of LITVC advantages and disadvantages is presented. It is concluded that the LITVC performs well at low to moderate duty cycles, but not for high duty cycle requirements
Dirac Triplet Extension of the MSSM
In this paper we explore extensions of the Minimal Supersymmetric Standard
Model involving two triplet chiral superfields that share a
superpotential Dirac mass yet only one of which couples to the Higgs fields.
This choice is motivated by recent work using two singlet superfields with the
same superpotential requirements. We find that, as in the singlet case, the
Higgs mass in the triplet extension can easily be raised to
without introducing large fine-tuning. For triplets that carry hypercharge, the
regions of least fine tuning are characterized by small contributions to the
parameter, and light stop squarks, ; the latter is a result of the dependence of
the triplet contribution to the Higgs mass. Despite such light stop masses,
these models are viable provided the stop-electroweakino spectrum is
sufficiently compressed.Comment: 26 pages, 4 figure
Global differential geometry: An introduction for control engineers
The basic concepts and terminology of modern global differential geometry are discussed as an introduction to the Lie theory of differential equations and to the role of Grassmannians in control systems analysis. To reach these topics, the fundamental notions of manifolds, tangent spaces, vector fields, and Lie algebras are discussed and exemplified. An appendix reviews such concepts needed for vector calculus as open and closed sets, compactness, continuity, and derivative. Although the content is mathematical, this is not a mathematical treatise but rather a text for engineers to understand geometric and nonlinear control
Steady state entanglement in the mechanical vibrations of two dielectric membranes
We consider two dielectric membranes suspended inside a Fabry-Perot-cavity,
which are cooled to a steady state via a drive by suitable classical lasers. We
show that the vibrations of the membranes can be entangled in this steady
state. They thus form two mechanical, macroscopic degrees of freedom that share
steady state entanglement.Comment: example for higher environment temperatures added, further
explanations added to the tex
C-band radar calibration using GEOS-3
The various methods of determining tracking radar measurement error parameters are described, along with the projected accuracy of results. Typical examples and results for calibration of radars tracking the GEOS-3 satellite are presented
Arkansas Cotton Variety Test 2013
The primary goal of the Arkansas Cotton Variety Test is to provide unbiased data regarding the agronomic performance of cotton varieties and advanced breeding lines in the major cotton-growing areas of Arkansas. This information helps seed companies establish marketing strategies and assists producers in choosing varieties to plant. These annual evaluations will then facilitate the inclusion of new, improved genetic material in Arkansas cotton production
Coupled pair approach for strongly-interacting trapped fermionic atoms
We present a coupled pair approach for studying few-body physics in
harmonically trapped ultracold gases. The method is applied to a two-component
Fermi system of particles. A stochastically variational gaussian expansion
method is applied, focusing on optimization of the two-body correlations
present in the strongly interacting, or unitary, limit. The groundstate energy
of the four-, six- and eight-body problem with equal spin populations is
calculated with high accuracy and minimal computational effort. We also
calculate the structural properties of these systems and discuss their
implication for the many-body ultracold gas and other few-body calculations.Comment: 7 pages, 4 figure
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