521 research outputs found
The analysis of nonstationary vibration data
The general methodology for the analysis of arbitrary nonstationary random data is reviewed. A specific parametric model, called the product model, that has applications to space vehicle launch vibration data analysis is discussed. Illustrations are given using the nonstationary launch vibration data measured on the Space Shuttle orbiter vehicle
Optimum data analysis procedures for Titan 4 and Space Shuttle payload acoustic measurements during lift-off
Analytical expressions have been derived to describe the mean square error in the estimation of the maximum rms value computed from a step-wise (or running) time average of a nonstationary random signal. These analytical expressions have been applied to the problem of selecting the optimum averaging times that will minimize the total mean square errors in estimates of the maximum sound pressure levels measured inside the Titan IV payload fairing (PLF) and the Space Shuttle payload bay (PLB) during lift-off. Based on evaluations of typical Titan IV and Space Shuttle launch data, it has been determined that the optimum averaging times for computing the maximum levels are (1) T (sub o) = 1.14 sec for the maximum overall level, and T(sub oi) = 4.88 f (sub i) (exp -0.2) sec for the maximum 1/3 octave band levels inside the Titan IV PLF, and (2) T (sub o) = 1.65 sec for the maximum overall level, and T (sub oi) = 7.10 f (sub i) (exp -0.2) sec for the maximum 1/3 octave band levels inside the Space Shuttle PLB, where f (sub i) is the 1/3 octave band center frequency. However, the results for both vehicles indicate that the total rms error in the maximum level estimates will be within 25 percent the minimum error for all averaging times within plus or minus 50 percent of the optimum averaging time, so a precise selection of the exact optimum averaging time is not critical. Based on these results, linear averaging times (T) are recommended for computing the maximum sound pressure level during lift-off
Investigation of statistical techniques to select optimal test levels for spacecraft vibration tests Final report, 1 Nov. 1969 - 31 Oct. 1970
Statistical techniques for selecting optimal test levels for vibration tests of spacecraft hardwar
A method for predicting launch vehicle vibration levels in the region of the spacecraft adaptor
Prediction curves for launch vehicle vibration levels in region of spacecraft adapto
Nurses Alumni Association Bulletin, Fall 1999
1999-2000 Meeting Dates Calendar
2000 Annual Luncheon-Meeting Notice
Fall Social
Officers and Committee Chairs
Bulletin Publication Committee
The President\u27s Message
Treasurer\u27s Report
News About Our Graduates
History of The Nurses Relief Fund
Nurses Wear White
Memories of My Nurse Training Days
Scholarship Funds At Work
Second Janet C. Hindson Award
Rib Ticklers
Happy Birthday
Fiftieth Anniversary
Resume Alumni Association Meetings
Alumni Office News
Committee Reports Bulletin Nominating Relief Fund Scholarship Social Development
Luncheon Photos
In Memoriam, Names of Deceased Graduates
Class News
Janet C. Hindson Memorial Award (How to Submit Names)
Scholarship Fund Application
Certification Reimbursement Application
Relief Fund Application
Pins, Transcripts, Class Address List, Change of Address Forms
Campus Ma
An evaluation of Space Shuttle STS-1 payload bay acoustic data and comparison with predictions
During the first launch (STS-1) of the Space Shuttle orbiter vehicle, sound pressure levels were measured at several locations in the payload bay of the vehicle and on the exterior surface. The data were obtained in order to provide validation for prediction procedures for interior and exterior sound pressure levels and to determine, independently, the acoustic environment in the payload bay during actual launch conditions
Effect of ethylene on carnation growth
June 1974.Covers not scanned.Includes bibliographical references.Carnation flowers are susceptible to damage when exposed to rather low ethylene dosages. This research confirmed that ethylene also affects the growth of the carnation plant. Severe growth reduction occurred when plants were treated continuously with 100 ppb, 300 ppb, and 500 ppb C2H4. Plants treated with the same concentrations for shorter periods showed less damage. Ethylene treatment at different growth stages produced varying plant responses. Plants treated during rapid growth stages (e.g. "rapid elongation" and "bud initiation") were more susceptible to ethylene than were plants treated at stages of relatively less rapid growth (e.g. after pinching and after planting). It was suggested that low ethylene levels for prolonged periods could result in serious growth reduction. Ethylene levels in most urban areas are high enough to warrant concern by growers in such areas. Ambient ethylene levels in the Denver Metropolitan area may cause more stem shortening than was previously thought. A grower should consider ambient C2H4 levels before locating his range in an urban area
Nurses Alumni Association Bulletin, Fall 1998
1998-1999 Meeting Date Calendar
1999 Annual Luncheon & Meeting Notice
Fall Social
Officers and Committee Chairs
Bulletin Publication Committee
The President\u27s Message
Treasurer\u27s Report
News About Our Graduates
Highlight Of 1998
Operation Smile
Scholarship Funds At Work
Romania Trip
Double Honors
Doris Bowman
Memorial Service For Janet Hindson A time for everything
On the Lighter Side
Twenty Ways to Kill an Organization
Happy Birthday
Fiftieth Anniversary
Resume Alumni Association Meetings
Alumni Office News
Committee Reports Bulletin By-Laws Relief Fund Social Scholarship Development Nominating
Luncheon Photos
In Memoriam, Names of Deceased Graduates
Class News
Certification Reimbursement Application
Relief Fund Application
Scholarship Fund Application (new)
Pins, Transcripts, Class Address List, Change of Address Forms
Campus Ma
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