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Acoustic Interactions Between an Altitude Test Facility and Jet ...


acoustic measurements of a 1:48 scale-model test facility specifically designed and ...... at 85 Hz and 140 was in all likelihood a result of duct resonance. .... are located in the sector of the w-k plane bounded by the lines w = kao(l + Mo) and.


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I found an answer from answers.yahoo.com

Physics question! Please show your work!? | Yahoo Answers


The two frequencies are both harmonics (multiples) of the resonant frequency of the string. To find that, you need the greatest common divisor, ...


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I found an answer from nescacademy.nasa.gov

FFT


In many cases, data acquisition systems are set-up to measure data segments which are an integer power of 2. Calculate ... Tuning Fork. Drive a tuning fork into steady-state resonance using magnetostriction. ... There are six blades on each engine, so the blade passing frequency is 85 Hz. ... The shaft diameter is 38 inch


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RAD229: Final Exam – 2017/2018 Please do not proceed to the next ...


(i) Describe, qualitatively, the effect of off-resonance on the image. (ii) Repeat (i) if ... Segment k-space into 200 annular regions each with 16 samples ... CPMG Sequence: You are asked to design a CPMG sequence with echo-train length of 20, with 90° .... some point (d), about 106°/ 180° x 125Hz, or at about 85Hz, but it is ...


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The first year of the BABAR experiment at PEP-II


data at energies on and around the 4S resonance since May 1999. ..... currents and luminosity, from background measurements performed in July 2000. ..... The superlayer structure facilitates fast local segment finding ..... L3 logging rate of 85 Hz. There is therefore considerable headroom already available for operation.


For more information, see The first year of the BABAR experiment at PEP-II

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NASA Engineering and Safety Center Technical Assessment Report ...


Sep 24, 2009 ... Flight Force Measurements of the Gamma-Ray Large ...... (5) The 5 to 10 Hz segment was performed previously in the low level run and not ...... resonant behavior as compared to measured flight forces. .... thrust mode with significant modal mass at 85 Hz causing the prediction of high responses for.


For more information, see NASA Engineering and Safety Center Technical Assessment Report ...