2,252 research outputs found
Newspaper - The Shelby Daily Star - May 22 1965 - Joseph McClain
Article about spiritual renewal written by Joseph T. McClain.https://digitalcommons.gardner-webb.edu/first-baptist-shelby-joseph-tolbert-mcclain/1010/thumbnail.jp
Tribute to Zeno Wall by Dr. Joseph T. McClain
A newspaper clipping of Joseph T. McClain\u27s tribute to Zeno Wall, first published in the Informer.https://digitalcommons.gardner-webb.edu/first-baptist-shelby-zeno-wall/1036/thumbnail.jp
Assessment of Ice Shape Roughness Using a Self-Orgainizing Map Approach
Self-organizing maps are neural-network techniques for representing noisy, multidimensional data aligned
along a lower-dimensional and nonlinear manifold. For a large set of noisy data, each element of a finite set of codebook
vectors is iteratively moved in the direction of the data closest to the winner codebook vector. Through successive
iterations, the codebook vectors begin to align with the trends of the higher-dimensional data. Prior investigations of ice
shapes have focused on using self-organizing maps to characterize mean ice forms. The Icing Research Branch has
recently acquired a high resolution three dimensional scanner system capable of resolving ice shape surface roughness. A
method is presented for the evaluation of surface roughness variations using high-resolution surface scans based on a
self-organizing map representation of the mean ice shape. The new method is demonstrated for 1) an 18-in. NACA 23012
airfoil 2 AOA just after the initial ice coverage of the leading 5 of the suction surface of the airfoil, 2) a 21-in. NACA 0012 at
0AOA following coverage of the leading 10 of the airfoil surface, and 3) a cold-soaked 21-in.NACA 0012 airfoil without
ice. The SOM method resulted in descriptions of the statistical coverage limits and a quantitative representation of early
stages of ice roughness formation on the airfoils. Limitations of the SOM method are explored, and the uncertainty limits
of the method are investigated using the non-iced NACA 0012 airfoil measurements
Vegetation and Flora of the Sand Deposits of the Mississippi River Valley in Northwestern Illinois
This study was undertaken to determine vascular plant species composition, vegetation structure,
and floristic quality of the major plant communities in the windblown sand deposits of northwestern
Illinois during the growing seasons of 2002 through 2005. The major plant communities of
the Ayers Sand Prairie Nature Preserve in Carroll County, Big River State Forest in Henderson
County, Lost Mound Unit of the Upper Mississippi River Wildlife and Fish Refuge in Carroll and
Jo Daviess counties, and the Thomson-Fulton Sand Prairie Nature Preserve located in Whiteside
County were examined and the importance values determined for the plant species present. Located
on broad terraces of the Mississippi River, these nature preserves and natural areas are remnants
of a larger grassland/savanna/forest complex that contained extensive marsh; wet, mesic, and dry
sand prairie; sand savanna; and sand forest communities. Most of the sand deposits are now cultivated
and the original vegetation is found only in protected remnants, some of which are relatively
large. The mature dry sand prairies were dominated by Schizachyrium scoparium; other important
species were Opuntia macrorhiza, Dichanthelium villosissimum, Ambrosia psilostachya, and
Tephrosia virginiana. Other assemblages of prairie and exotic species were encountered in successional
sand prairie communities. Generally, the mature prairie communities in these preserves and
natural areas had 35 or more species present in the study plots. Savanna and closed canopy forest
communities were also examined. The dry sand savannas were dominated by Quercus velutina and
Q. marilandica, dry sand forests were dominated by Q. velutina, and dry-mesic sand forests were
dominated by Q. alba and Q. velutina.Illinois Department of Natural Resources; Illinois Nature Preserves Commissionpublished or submitted for publicationis peer reviewe
Ice Roughness and Thickness Evolution on a Swept NACA 0012 Airfoil
Several recent studies have been performed in the Icing Research Tunnel (IRT) at NASA Glenn Research Center focusing on the evolution, spatial variations, and proper scaling of ice roughness on airfoils without sweep exposed to icing conditions employed in classical roughness studies. For this study, experiments were performed in the IRT to investigate the ice roughness and thickness evolution on a 91.44-cm (36-in.) chord NACA 0012 airfoil, swept at 30-deg with 0deg angle of attack, and exposed to both Appendix C and Appendix O (SLD) icing conditions. The ice accretion event times used in the study were less than the time required to form substantially three-dimensional structures, such as scallops, on the airfoil surface. Following each ice accretion event, the iced airfoils were scanned using a ROMER Absolute Arm laser-scanning system. The resulting point clouds were then analyzed using the self-organizing map approach of McClain and Kreeger to determine the spatial roughness variations along the surfaces of the iced airfoils. The resulting measurements demonstrate linearly increasing roughness and thickness parameters with ice accretion time. Further, when compared to dimensionless or scaled results from unswept airfoil investigations, the results of this investigation indicate that the mechanisms for early stage roughness and thickness formation on swept wings are similar to those for unswept wings
Convective Enhancement of Icing Roughness Elements in Stagnation Region Flows
To improve existing ice accretion simulation codes, more data regarding ice roughness and its effects on convective heat transfer are required. To build on existing research on this topic, this study used the Vertical Icing Studies Tunnel (VIST) at NASA Glenn Research to model realistic ice roughness in the stagnation region of a NACA 0012 airfoil. Using the VIST, a test plate representing the leading 2% chord of the airfoil was subjected to flows of 7.62 m/s (25 ft/s), 12.19 m/s (40 ft/s), and 16.76 m/s (55 ft/s). The test plate was fitted with 3 surfaces, each with a different representation of ice roughness: 1) a control surface with no ice roughness, 2) a surface with ice roughness with element height scaled by 10x and streamwise rough zone width from the stagnation point scaled by 10x, and 3) a surface with ice roughness with element height scaled by 10x and streamwise rough zone width from the stagnation point scaled by 25x. Temperature data from the tests were recorded using an infrared camera and thermocouples imbedded in the test plate. From the temperature data, a convective heat transfer coefficient map was created for each case. Additional testing was also performed to validate the VIST's flow quality. These tests included five-hole probe and hot-wire probe velocity traces to provide flow visualization and to study boundary layer formation on the various test surfaces. The knowledge gained during the experiments will help improve ice accretion codes by providing heat transfer coefficient validation data and by providing flow visualization data helping understand current and future experiments performed in the VIST
Paper Session I-C - Seeds II: More Tomatoes from Space
NASA Life Sciences Outreach, in collaboration with several other organizations, is getting ready to release space exposed seeds to teachers and students. This project, called Space Exposed Experiment Developed for Students II (SEEDS II) was designed to provide teachers and students with seeds and information so that they can conduct biological research relating to the effects of the space and undersea environments
Claytonia virginica L.
https://thekeep.eiu.edu/herbarium_specimens_byname/20816/thumbnail.jp
- …