1,723,487 research outputs found
[Tasmanian landscape] [picture] /
No full textInscriptions on reverse: Mrs. Nixon; From Johannah Clyne Crear's Australian scrapbook.; Rex Nan Kivell Collection NK6887
[Mt. Wellington from New Town] [picture] /
No full textInscription on reverse: From Johannah Clyne Crear's Australian scrapbook.; Rex Nan Kivell Collection NK6840/A
[Syndal, Ross, Tasmania] [picture] /
No full textInscription on reverse: From Johannah Clyne Crear's Australian scrapbook.; Rex Nan Kivell Collection NK9882
[View of the South Esk River, Tasmania] [picture] /
No full textInscription on reverse: From Johannah Clyne Crear's scrapbook.; Rex Nan Kivell Collection NK6836/E
South Esk at Clynevale [picture] /
No full textRex Nan Kivell Collection NK6836/D.; Title from inscription on reverse; also inscribed: From Johannah Clyne Crear's Australian scrapbook
Ben Lomond, near Tullochgorum [picture] /
No full textInscription on reverse: From Johannah Clyne Crear's Australian scrapbook.; Rex Nan Kivell Collection NK6836/F.; Title from inscription on reverse.; Exhibited: Beyond the Picket Fence, NLA 1995
Van Clyne Nall, Oral History
No full textThis is a video recording of an oral history with Van Clyne Nall. It was conducted in his home on August 29, 2007. The interviewer is Glenn Gainer.
In this interview, Van Clyne Nall discusses his service in World War II, and his experience as a prisoner of war.
Van Clyne Nall was born in Tyler, Texas. He was inducted in to the Army after he finished high school and sent to Fort Hood, in Killeen, Texas. He was later stationed in Boston, Massachusetts, and was eventually deployed to Marseille, France.
Nall was captured by German troops in January of 1945 and was held as a POW until the war ended. At the end of the war, the Russian Army liberated the camp and a nearby village. American soldiers were on the opposite side of the river, but Nall was not allowed to join them. He commandeered a bicycle and rode until he found American troops.
Nall was taken to a military hospital where he was nursed back to health. He was shipped home from Le Havre, France, and landed at Newport News, Virginia. Nall took a train back to Texas where he spent a few months adjusting to life. After returning home, he attended Wheaton College in Wheaton, Illinois, and earned a degree in anthropology. Nall spent his life working in Christian ministry. He passed away on March 21, 2010.https://lair.etamu.edu/scua-oral-history-all/1002/thumbnail.jp
Clyne S. Shaffner papers
No full textClyne S. Shaffner (1914-1984) had a lengthy career in Poultry Science, during which he made great advances in preserving chicken sperm through freezing. Shaffner was born April 18, 1914, in Freeland, Michigan. As a young man, he was active in the Michigan Junior Farm Bureau. He earned his B. S. degree at Michigan State College in 1938, his M. S. in 1940, and his Ph. D. from Purdue University in 1947. In 1947 he accepted a position as Associate Professor of Physiology and Genetics in the Department of Poultry Science at the University of Maryland. He served as department head until 1971 and remained at Maryland until his retirement in 1977. A fellow of the Poultry Science Association and of the American Association for the Advancement of Science, he also served as president of the Poultry Science Association from 1961 to 1962. Shaffner died in West Laurel, Maryland, on May 19, 1984, at the age of seventy. The Clyne S. Shaffner papers contain notes and assignments from Shaffner's classes at Michigan State College and Purdue University in the early 1940s, publications of the Michigan Junior Farm Bureau, and personal letters to Shaffner from Laura Jean Denham
Heat Transfer Through Plasma-Sprayed Thermal Barrier Coatings in Gas Turbines: A Review of Recent Work
No full textA review is presented of how heat transfer takes place in plasma-sprayed (zirconia-based) thermal barrier coatings (TBCs) during operation of gas turbines. These characteristics of TBCs are naturally of central importance to their function. Current state-of-the-art TBCs have relatively high levels of porosity (~15%) and the pore architecture (i.e., its morphology, connectivity, and scale) has a strong influence on the heat flow. Contributions from convective, conductive, and radiative heat transfer are considered, under a range of operating conditions, and the characteristics are illustrated with experimental data and modeling predictions. In fact, convective heat flow within TBCs usually makes a negligible contribution to the overall heat transfer through the coating, although what might be described as convection can be important if there are gross through-thickness defects such as segmentation cracks. Radiative heat transfer, on the other hand, can be significant within TBCs, depending on temperature and radiation scattering lengths, which in turn are sensitive to the grain structure and the pore architecture. Under most conditions of current interest, conductive heat transfer is largely predominant. However, it is not only conduction through solid ceramic that is important. Depending on the pore architecture, conduction through gas in the pores can play a significant role, particularly at the high gas pressures typically acting in gas turbines (although rarely applied in laboratory measurements of conductivity). The durability of the pore structure under service conditions is also of importance, and this review covers some recent work on how the pore architecture, and hence the conductivity, is affected by sintering phenomena. Some information is presented concerning the areas in which research and development work needs to be focussed if improvements in coating performance are to be achieved
The Effect of a High Thermal Gradient on Sintering and Stiffening in the Top Coat of a Thermal Barrier Coating (TBC) System
No full textSuperalloy substrates coated with plasma sprayed CoNiCrAlY bond coats and yttria-stabilized zirconia top coats have been subjected to a high heat flux in a controlled atmosphere chamber. The sintering exhibited by the top coat under these conditions has been studied and compared with the behavior observed during isothermal heating, both when attached to the substrate and when detached. Sintering has been characterized by (a) microstructural examinations, (b) dilatometry, in both in-plane and through-thickness directions, and (c) stiffness measurements, using both cantilever bending and nanoindentation. A numerical heat flow model has been used to explore the stress state under isothermal and thermal gradient conditions. Sintering proceeds faster at higher temperature, but is retarded by the presence of tensile stresses (from differential thermal expansion between coating and substrate) within the top coat. Sintering occurs preferentially near the free surface of the top coat under gradient conditions, not only because of the higher temperature, but also because the in-plane stress is more compressive in that region
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