Effects of impingement of rocket exhaust gases and solid particles on a spacecraft Interim report, Mar. 18 - Oct. 25, 1966

Impingement damage to spacecraft from rocket exhaust gases and micron sized metal particle

Determination of wind tunnel constraint effects by a unified pressure signature method. Part 1: Applications to winged configurations

A new, fast, non-iterative version of the "Wall Pressure Signature Method" is described and used to determine blockage and angle-of-attack wind tunnel corrections for highly-powered jet-flap models. The correction method is complemented by the application of tangential blowing at the tunnel floor to suppress flow breakdown there, using feedback from measured floor pressures. This tangential blowing technique was substantiated by subsequent flow investigations using an LV. The basic tests on an unswept, knee-blown, jet flapped wing were supplemented to include the effects of slat-removal, sweep and the addition of unflapped tips. C sub mu values were varied from 0 to 10 free-air C sub l's in excess of 18 were measured in some cases. Application of the new methods yielded corrected data which agreed with corresponding large tunnel "free air" resuls to within the limits of experimental accuracy in almost all cases. A program listing is provided, with sample cases

Determination of wind tunnel constraint effects by a unified pressure signature method. Part 2: Application to jet-in-crossflow

The development of an improved jet-in-crossflow model for estimating wind tunnel blockage and angle-of-attack interference is described. Experiments showed that the simpler existing models fall seriously short of representing far-field flows properly. A new, vortex-source-doublet (VSD) model was therefore developed which employs curved trajectories and experimentally-based singularity strengths. The new model is consistent with existing and new experimental data and it predicts tunnel wall (i.e. far-field) pressures properly. It is implemented as a preprocessor to the wall-pressure-signature-based tunnel interference predictor. The supporting experiments and theoretical studies revealed some new results. Comparative flow field measurements with 1-inch "free-air" and 3-inch impinging jets showed that vortex penetration into the flow, in diameters, was almost unaltered until 'hard' impingement occurred. In modeling impinging cases, a 'plume redirection' term was introduced which is apparently absent in previous models. The effects of this term were found to be very significant

Biblical Leadership Principles and Practices Used By University Leaders

This study was conducted to ascertain the leadership principles and practices of those persons in leadership positions at a private, Christian university. The purpose, therefore, was to determine to what degree the leaders at the Christian university under study did practice biblical principles and practices in their leadership. The research design was an explanatory sequential mixed methods study. The same private, Christian university was used for both the quantitative and the qualitative study. The quantitative method employed the Leadership Practices Inventory which asked 30 questions using a Likert scale to determine to what degree 50 leaders at the university practiced the five exemplary leadership practices of modeling the way, inspiring a shared vision, challenging the process, encouraging others to act, and encouraging the heart. The qualitative method contained nine questions asking 13 leaders at the same university their observation and practice of the five exemplary leadership practices along with any other leadership practices, biblical or otherwise, that guided them in their leadership practice. The results discovered from the explanatory sequential mixed method approach for this dissertation were encouraging and supportive that the leaders who were surveyed and interviewed were active in applying biblical principles in their leadership

Derby Fisheries, Individual Quotas, and Transition in the Fish Processing Industry

Processors adapt to the pulse of landings in derby fisheries by investing in large-scale facilities capable of preserving and storing fish products. In fisheries where the pulse of landings suppresses the ability of processors to meet consumer demand for fresh product, the imposition of individual quota (IQ) systems transforms the associated fish processing industry. The cost of fresh fish processing is generally lower and more malleable than that for preserved fish, and consumers may pay a price premium for fresh product, which creates an opportunity for entry by fresh-fish processors and results in higher equilibrium ex-vessel prices. Incumbent firms are likely to experience an economic dislocation due to a diminished value of nonmalleable capital used to preserve and store fish products. Our paper generalizes and provides a modeling framework for the observed changes in the British Columbian halibut harvester/processor industry complex following the introduction of an IQ system.Derby fishery, individual quotas, pulse of landings, fish processing, fresh fish, preserved fish, product forms, ex-vessel price, wholesale fish price, processing capital, malleability, Resource /Energy Economics and Policy, Q13, Q22,

Seeding requirements for scanning laser velocimetry

To measure the velocity distributions within time dependent turbulent flow fields, a continuously scanning laser velocimeter system is being developed at Sandia National Laboratories Livermore (SNLL). A prototype of this system has produced results which show that spatial and temporal variations in particle seed distribution seriously compromise the overall performance and operation of this device. To alleviate some of these problems, alternate flow seeding concepts are explored. The most promising appear to be those that actively induce laser sparks within the gas flow, the velocity of which may be measured by a Fourier transformed velocimetry system

A Model of the Extension and Branching of a Seminal Root of Barley, and Its Use in Studying Relations Between Root Dimensions I the Model

RESP-660