USING LANDSAT IMAGERY TO EVALUATE LANDSCAPE-LEVEL IMPACTS OF NATURAL GAS FIELD DEVELOPMENT: TAZOVSKY PENNINSULA, RUSSIA, 1984-2007

The Yamburg gas condensate field in northwestern Siberia sits atop the largest natural gas and petroleum basin in the world. Infrastructure related to the extraction and transport of natural gas is both geographically widespread, and has been shown to affect a much larger area than the immediate infrastructural footprint. Because field studies of the environmental impacts of development are often costly or unfeasible given the remoteness of these areas and access restrictions, the use of remote-sensing technologies is a valuable asset for assessing and quantifying disturbance over large areas. Freely available 30 meter resolution Landsat imagery from 1984 to 2007 was employed in this thesis to quantify the effects of natural gas infrastructure on the adjacent tundra using three methods: a landscape fragmentation analysis, mean and change in mean NDVI analyses, and a cross-tabulation analysis. These analyses show that the tundra has become increasingly fragmented during the study period, and that mean NDVI values in areas adjacent to development are lower than those calculated for undisturbed areas. As distance from the infrastructural footprint increases, differences in mean NDVI decrease, approaching undisturbed values at approximately 90 – 150 m. Additionally, analysis of changes in mean NDVI values over time indicate that new infrastructure development has a depressing effect on adjacent NDVI values, while areas that have been consistently developed show a vegetation recovery response evidenced by positive changes in NDVI values when compared to undisturbed areas. Cross-tabulation of the changes in NDVI values between analysis dates indicate that these changes can be attributed to the conversion of vegetated areas to bare ground or water in the case of new development, and conversion from bare ground or water to vegetation in areas that have been consistently developed

John Stevens Wallace Correspondence

Entries include brief biographical information, a typed letter from sales manager Bennett on Stephen Daye Press, Inc., Book Publishers, stationery concerning moving the publisher from Vermont to New York City, changes in staff, and a book with several revisions of the working title presumably written by author and illustrator John Stevens Wallace with some biographical information about him, a typed letter from the Maine State Library requesting biographical information about Wallace, a humorous letter of reply concerning Wallace\u27s place of birth from Bennett on revised Stephen Daye Press, Inc., stationery, a typed letter from the Maine State Library requesting a copy of Wallace\u27s book titled Village Down East for the Maine Author Collection, a typed letter from Wallace on personal notepaper with some biographical information and hopes of presenting his original drawings from the book on exhibit at the Maine State Library, a typed letter of reply on receipt of Wallace\u27s book gift for the Maine Author Collection that the Maine State Library had no place to display works of art with suggestions of libraries that did host events of this type, and a letter typed from Jacob of the Maine State Library with an appeal for biographical information and a call for Wallace to pursue an exhibit of his drawings

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Ionic-covalent entanglement hydrogels from gellan gum, carrageenan and an epoxy-amine

A \u27one pot\u27 preparation of interpenetrating polymer network hydrogels with double network characteristics is presented. A small addition of biopolymer dramatically increases the stiffness and strength of the epoxy-amine gels without affecting the large strain at failure value

A Test of Audit Pricing in the Small-Client Segment: A Comment

This study is the second to provide a richer test of the association between auditor size and audit fees by using three audit firm size classes in the small-client segment of the U.S. audit market. The finding of a Big 8 (now Big 6) price premium is consistent with Francis and Simon [1]. However, this price premium exists only with respect to local/regional firms. Francis und Simon showed that the Big 8 price premium exists with respect to both second-tier and local/regional firms. The present study also provides evidence of a second-tier price premium over local/regional firms. The results imply product differentiation to both Big 8 and second-tier firms. Plausible reasons for differences in results between the two studies are given.Yeshttps://us.sagepub.com/en-us/nam/manuscript-submission-guideline

Tissue engineering with gellan gum

Engineering complex tissues for research and clinical applications relies on high-performance biomaterials that are amenable to biofabrication, maintain mechanical integrity, support specific cell behaviours, and, ultimately, biodegrade. In most cases, complex tissues will need to be fabricated from not one, but many biomaterials, which collectively fulfill these demanding requirements. Gellan gum is an anionic polysaccharide with potential to fill several key roles in engineered tissues, particularly after modification and blending. This review focuses on the present state of research into gellan gum, from its origins, purification and modification, through processing and biofabrication options, to its performance as a cell scaffold for both soft tissue and load bearing applications. Overall, we find gellan gum to be a highly versatile backbone material for tissue engineering research, upon which a broad array of form and functionality can be built