Numerical aerodynamic simulation facility

Critical to the advancement of computational aerodynamics capability is the ability to simulate flows about three-dimensional configurations that contain both compressible and viscous effects, including turbulence and flow separation at high Reynolds numbers. Analyses were conducted of two solution techniques for solving the Reynolds averaged Navier-Stokes equations describing the mean motion of a turbulent flow with certain terms involving the transport of turbulent momentum and energy modeled by auxiliary equations. The first solution technique is an implicit approximate factorization finite-difference scheme applied to three-dimensional flows that avoids the restrictive stability conditions when small grid spacing is used. The approximate factorization reduces the solution process to a sequence of three one-dimensional problems with easily inverted matrices. The second technique is a hybrid explicit/implicit finite-difference scheme which is also factored and applied to three-dimensional flows. Both methods are applicable to problems with highly distorted grids and a variety of boundary conditions and turbulence models

The development of educational, moral and social attitudes of sixth formers in school in Cumbria, 1976-77

This study attempts to consider, in the light of two surveys, the development of attitudes of Sixth Form pupils in certain selected schools in Cumbria over a specific period. The surveys contain questions relating to attitudes in respect of: Sixth Form studies, life and relationships within the Sixth Form; behaviour as manifest in attitudes to authority and the use of authority; values in school. Initially, the study examines attitude formation and change in general terms and in relation to the present research. A section of the work appraises the research into and the writing about the development of education in the Sixth Form; a further section establishes areas of common ground between the work on attitudes and the work concerned with Sixth Formers. Next, the results of each survey have been compiled and analysed. In each case, the main directions of the responses have been made clear, particular trends and developments being stressed where appropriate. The percentage of responses to each question has, in both cases, been recorded, the responses having been classified into broad groups or categories. A detailed examination has been made of the responses in each category with further records of the percentage of responses in relation to particular aspects. Tables of comparison of the categories of responses are included in the appendices. Patterns of vocabulary, areas of concern, common themes and the degree of involvement of respondents are all considered. Wherever appropriate, quotations from responses have been included. There follows a comparison between the first survey and the second survey which deals in every case with responses to questions in two parts. Part I in each comparison contains tables of percentage responses, listed according to the categories. Part II analyses the changes which appear to have occurred in the attitudes of the Sixth Formers contacted, always referring, where appropriate, to the number and kind of responses. The final part of the research offers conclusions and a five-part recommendation arising from the appraisal of the surveys

An analysis of the relationships between articulation and auditory discrimination in kindergarten children

Thesis (Ed.M.)--Boston Universit

Design and performance of controlled-diffusion stator compared with original double-circular-arc stator

The capabilities of two stators, one with controlled-diffusion (CD) blade sections and one with double-circular-arc (DCA) blade sections, were compared. A CD stator was designed and tested that had the same chord length but half the blades of the DCA stator. The same fan rotor (tip speed, 429 m/sec; pressure ratio, 1.65) was used with each stator row. The design and analysis system is briefly described. The overall stage and rotor performances with each stator are compared, as are selected blade element data. The minimum overall efficiency decrement across the stator was approximately 1 percentage point greater with the CD balde sections than with the DCA blade sections

B815: A Comparison of Small Single- and Double-Drum Cable Systems for Prebunching Partial Cuts

This study evaluated two single-drum and two double-drum winching systems for prebunching small-diameter, tree-length stems from partial cuts. Three farm tractors with Farmi winches and one sled-mounted winch were used. One single-drum system was run by professional woods workers and the others were operated by forestry students. Three different types of chokers were used and a skid cone was used with two systems. The professional crew used a self-release block at the back of the trailside pile to avoid piling delays while the other systems used a spar tree. All systems were evaluated by time studies. The professional crew was the most efficient due to the use of the self-release block at the back of the pile, low setup time, fewer delays and high motivation. There was no significant advantage to using the skid cone nor were there significant differences among chokers.https://digitalcommons.library.umaine.edu/aes_bulletin/1109/thumbnail.jp

Apple Blossoms

https://digitalcommons.library.umaine.edu/mmb-vp/2835/thumbnail.jp

Carotene Content of Native Nebraska Grasses

The carotene content of twenty-four grasses native to Nebraska were determined at approximately monthly intervals from June to November. While the carotene concentration of most of the grasses was moderately high during the growing season, it declined to a rather low point by late November. With the exception of Switchgrass, Hairy Grama, Little Bluestem and Prairie Dropseed, all of the grasses contained enough carotene to supply the needs of range cattle until late November. However, only eighteen of the grasses still contained enough carotene by the latter part of September to furnish the carotene required by dairy cows. Even as early as July the Northern reedgrass, Buffalo grass, Bluejoint and Lovegrass were unsatisfactory as a source of carotene for dairy cows. While the carotene values observed during the periods of greatest concentration varied from 511.6 ppm (Sandhill bluestem) to 122.6 ppm (Northern reedgrass), these values ranged from 60.7 ppm (June grass) to 1.6 ppm (Little bluestem) during the periods of lowest concentration

Properties of starspots on CoRoT-2

As a planet eclipses its parent star, a dark spot on the surface of the star may be occulted, causing a detectable variation in the light curve. A total of 77 consecutive transit light curves of CoRoT-2 were observed with a high temporal resolution of 32 s, corresponding to an uninterrupted period of 134 days. By analyzing small intensity variations in the transit light curves, it was possible to detect and characterize spots at fixed positions (latitude and longitude) on the surface of the star. The model used simulates planetary transits and enables the inclusion of spots on the stellar surface with different sizes, intensities (i.e. temperatures), and positions. Fitting the data by this model, it is possible to infer the spots physical characteristics. The fits were either in spot longitude and radius, with a fixed intensity, or in spots longitude and intensity, for spots of constant size. Before the modeling of the spots were performed, the planetary radius relative to the star radius was estimated by fitting the deepest transit to minimize the effect of spots. A slightly larger (3%) radius, 0.172 Rstar, resulted instead of the previously reported 0.1667 Rstar . The fitting of the transits yield spots, or spot groups, with sizes of ranging from 0.2 to 0.7 planet radius, Rp, with a mean of (0.41 +/- 0.13) Rp (~100,000 km), resulting in a stellar area covered by spots within the transit latitudes of 10-20%. The intensity varied from 0.4 to 0.9 of the disk center intensity, Ic, with a mean of (0.60 +/- 0.19) Ic, which can be converted to temperature by assuming an effective temperature of 5625 K for the stellar photosphere, the spots temperature ranges mainly from 3600 to 5000 K. The results from the spot modeling are in agreement with those found for magnetic activity analysis from out of transit data of the same star.Comment: 7 pages, 11 figure