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Binary hypothesis-based impact damage detection for composite material system embedded with fiber Bragg gratings
Thermal/structural analysis of a transpiration cooled nozzle
The 8-foot High Temperature Tunnel (HTT) at LaRC is a combustion driven, high enthalpy blow down wind tunnel. In Mar. 1991, during check out of the transpiration cooled nozzle, pieces of platelets were found in the tunnel test section. It was determined that incorrect tolerancing between the platelets and the housing was the primary cause of the platelet failure. An analysis was performed to determine the tolerance layout between the platelets and the housing to meet the structural and performance criteria under a range of thermal, pressure, and bolt preload conditions. Three recommendations resulted as a product of this analysis
Adósság és moralitás: gondolatok a gazdasági antropológia hozzájárulásairól
NemrĂ©g egy, az adĂłsság Ă©s hitel antropolĂłgiájárĂłl Ărt szemlĂ©jĂ©ben Gustav Peebles „meglepĹ‘ következetessĂ©get” talált a hitelnek a mindenĂĽtt jelenlĂ©vĹ‘, az adĂłssággal szembeni pozitĂv Ă©rtĂ©kelĂ©sĂ©bĹ‘l adĂłdĂł erkölcsi megĂtĂ©lĂ©sĂ©ben. MiĂ©rt is van ez Ăgy? ÉrvĂ©nyes-e ez a pozitĂv Ă©rtĂ©kĂtĂ©let a hitelezĹ‘kre is? Melyek az elmĂ©leti következmĂ©nyei ezeknek a kĂ©rdĂ©seknek a gazdasági antropolĂłgiára nĂ©zve
A combined spectroscopic and photometric stellar activity study of Epsilon Eridani
We present simultaneous ground-based radial velocity (RV) measurements and
space-based photometric measurements of the young and active K dwarf Epsilon
Eridani. These measurements provide a data set for exploring methods of
identifying and ultimately distinguishing stellar photospheric velocities from
Keplerian motion. We compare three methods we have used in exploring this data
set: Dalmatian, an MCMC spot modeling code that fits photometric and RV
measurements simultaneously; the FF method, which uses photometric
measurements to predict the stellar activity signal in simultaneous RV
measurements; and H analysis. We show that our H measurements
are strongly correlated with photometry from the Microvariability and
Oscillations of STars (MOST) instrument, which led to a promising new method
based solely on the spectroscopic observations. This new method, which we refer
to as the HH method, uses H measurements as input into the FF
model. While the Dalmatian spot modeling analysis and the FF method with
MOST space-based photometry are currently more robust, the HH method only
makes use of one of the thousands of stellar lines in the visible spectrum. By
leveraging additional spectral activity indicators, we believe the HH method
may prove quite useful in disentangling stellar signals
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