18,692 research outputs found
Report on the City of Chattahoochee Hill Country. Potential Revenues and Expenditures - Brief
Using Fulton County revenue and expenditure data and benchmarks developed from other Georgia city data, this report evaluates the fiscal consequences of incorporating a new city of Chattahoochee Hill Country. FRC Brief 16
Report on the City of Chattahoochee Hill Country. Potential Revenues and Expenditures
Using Fulton County revenue and expenditure data and benchmarks developed from other Georgia city data, this report evaluates the fiscal consequences of incorporating a new city of Chattahoochee Hill Country. FRC Report 16
An Initial Evaluation of a Proposed Statewide Education Sales Tax
This report provides a preliminary analysis of a proposal to replace education property taxes with a statewide sales tax
Flight data display studies for real time computer flight evaluation Final report
Real time displays for in-flight monitoring of Saturn launch vehicle
Pulsation models for the roAp star HD 134214
Precise time-series photometry with the MOST satellite has led to
identification of 10 pulsation frequencies in the rapidly oscillating Ap (roAp)
star HD 134214. We have fitted the observed frequencies with theoretical
frequencies of axisymmetric modes in a grid of stellar models with dipole
magnetic fields. We find that, among models with a standard composition of
and with suppressed convection, eigenfrequencies of a
model with and a polar
magnetic field strength of 4.1kG agree best with the observed frequencies. We
identify the observed pulsation frequency with the largest amplitude as a
deformed dipole () mode, and the four next-largest-amplitude
frequencies as deformed modes. These modes have a radial quasi-node
in the outermost atmospheric layers (). Although the model
frequencies agree roughly with observed ones, they are all above the acoustic
cut-off frequency for the model atmosphere and hence are predicted to be
damped. The excitation mechanism for the pulsations of HD 134214 is not clear,
but further investigation of these modes may be a probe of the atmospheric
structure in this magnetic chemically peculiar star.Comment: 9 pages, 6 figures; accepted for publication in MNRA
Dusty plasma cavities: probe-induced and natural
A comprehensive exploration of regional dust evacuation in complex plasma
crystals is presented. Voids created in 3D crystals on the International Space
Station have provided a rich foundation for experiments, but cavities in dust
crystals formed in ground-based experiments have not received as much
attention. Inside a modified GEC RF cell, a powered vertical probe was used to
clear the central area of a dust crystal, producing a cavity with high
cylindrical symmetry. Cavities generated by three mechanisms are examined.
First, repulsion of micrometer-sized particles by a negatively charged probe is
investigated. A model of this effect developed for a DC plasma is modified and
applied to explain new experimental data in RF plasma. Second, the formation of
natural cavities is surveyed; a radial ion drag proposed to occur due to a
curved sheath is considered in conjunction with thermophoresis and a flattened
confinement potential above the center of the electrode. Finally, cavity
formation unexpectedly occurs upon increasing the probe potential above the
plasma floating potential. The cavities produced by these methods appear
similar, but each are shown to be facilitated by fundamentally different
processes.Comment: 10 pages, 12 figure
Space shuttle: Heat transfer rate measurements on Convair booster (B-15B-2) at nominal Mach number of 8
Plotted and tabulated data on heat transfer from a thin-skin thermocouple are presented. The data is representative of the reentry event of the booster alone configuration. The data were generated during wind tunnel tests of the B-15B-2 delta wing booster at Mach 8. Thermocouple measurements are reduced to heat transfer coefficient ratio and the data are presented as plotted variations versus longitudinal, lateral, and vertical local model positions
STOP - A computer program for supersonic transport trajectory optimization
IBM 7094 digital program using steepest ascent technique for optimizing flight path of supersonic transport aircraf
- …