Canadian Prisoners of War in the Great War

Review of Desmond Morton, Silent Battle: Canadian Prisoners of War In Germany, 1914-1919. Toronto: Lester Publications, 1992

Structure of friable Iowa loess

This dissertation was produced from a microfilm copy of the original document. While the most advanced technological means to photograph and reproduce this document have been used, the quality is heavily dependent upon the quality of the original submitted. The following explanation of techniques is provided to help you understand markings or patterns which may appear on this reproduction. 1. The sign or "target " for pages apparently lacking from the document photographed is "Missing Page(s)". If it was possible to obtain the missing page(s) or section, they are spliced into the film along with adjacent pages. This may have necessitated cutting thru an image and duplicating adjacent pages to insure you complete continuity. 2. When an image on the film is obliterated with a large round black mark, it is an indication that the photographer suspected that the copy may have moved during exposure and thus cause a blurred image. You will find a good image of the page in the adjacent frame

Effect of Successive Single-gestation Pregnancies on the Course of Maternal Human Immunodeficiency Virus Disease and Perinatal Transmission

Objective: This study was undertaken to examine the effect of successive pregnancies over a 3-year period on the course of maternal human immunodeficiency virus (HIV) infection and the rate of perinatal transmission of HIV

Impact of tropical instability waves on nutrient and chlorophyll distributions in the equatorial Pacific

Tropical instability waves (TIWs) are prominent seasonal features in both the equatorial Pacific and Atlantic Oceans. This work quantifies their role in modulating the distributions of nutrients and phytoplankton biomass. Using an eight year record of biannual ship observations along the Tropical Atmosphere Ocean (TAO) buoy array, cruise sections crossing TIWs were identified. Both a case study approach of individual TIWs and a first attempt at calculating their average effect on mixed layer properties were performed. Examination of individual TIWs demonstrates that their effect on nutrient and chlorophyll distributions is a function of the TIW intensity. Both strong and weak TIWs drive elevated nutrient concentrations directly on the equator, but strong TIWs possess enhanced recirculation which advects nutrient- and chlorophyll-poor waters from adjacent to the upwelling zone equatorward. This decreases nutrient concentrations from approximately 2°N to 8°N. Weak TIWs retain elevated nutrient concentrations in this latitudinal band due to less recirculation in TIW vortices, permitting chlorophyll increases. These differences between strong and weak TIWs were only observed north of the equator. Less recirculation was observed in TIW vortices south of the equator. This resulted in nutrient enhancements from TIWs along the southern portions of the cruise sections, especially in the eastern Pacific. The differences between northern and southern TIW dynamics suggest strong differences in TIW modulated carbon cycling between the two hemispheres. Seasonal modification of the equatorial currents also influences the extent to which TIWs alter nutrient and chlorophyll distributions. TIWs observed during boreal winter demonstrated enhanced nutrient and chlorophyll concentrations north of the equator. This resulted from the water mass north of the upwelling zone containing elevated nutrient and chlorophyll concentrations due to a shallow thermocline. Thermocline shoaling in boreal winter is the result of a slowing in the South Equatorial Current and North Equatorial Countercurrent caused by the seasonal decrease in westward trade wind velocities. These results suggest that there is a synergistic effect from TIWs and the seasonal shoaling of the thermocline which may be important for carbon cycling north of the equator. Composites of average mixed layer nutrient concentrations show TIW-induced nutrient enhancement on and south of the equator along most of the TAO lines, but no subsequent increase in mixed layer chlorophyll. This is likely due to the lag time between nutrient enhancement and biomass increase and/or chlorophyll increases in unsampled portions of the vortex. Regions of elevated chlorophyll concentrations were observed in SeaWiFS composites in unsampled portions of TIWs, which suggests that TIW induced lateral transport of nutrients may be driving important episodic export events south of the equator

Analysis of Hydrologic Data for the White River Basin

The value of the natural resources of the White River Basin (Basin), AR is recognized by the area's designation as a "Wetland of International Importance". The Basin constitutes one of the Nation's largest remaining intact forested wetland landscapes, second only to the Atchafalya Basin. It supports the North American continent's largest concentration of over-wintering mallard ducks, a world-class trout fishery, the last vestige of a big river fishery remaining in the Mississippi River Basin, and numerous threatened and endangered species. The continued viability of this wetland ecosystem depends on the suitability of the hydrologic environment to the resident flora and fauna. Numerous modifications of the Basin hydrologic features in the past century have seriously impaired the sustainability of these resources. The Basinwide alterations of hydrologic processes (e.g., impoundment and regulatory releases of flows and volumes in the upper reaches, navigational modifications of lower reaches, and consumptive demands for agricultural use throughout) have affected the hydrology of the system profoundly. The result is highly regulated flows and stages, vastly altered hydrologic patterns, over-stabilized water levels, and disruption of seasonal water distribution patterns. Given the critical nature of hydrology in regulating the structure and function of wetland ecosystems, the impacts have been devastating, particularly to the critical bottomland hardwoods that support the Basin's fish and wildlife resources. To date these piece-meal, system-wide, hydrologic alterations have cornmutatively degraded the habitat value of this resource for fish and wildlife in the Basin, and have lead to changes in their numbers and distributions. In spite of the enormous stakes involved, there has been no comprehensive characterization of the Basin hydrology. System alterations such as channel deepening, dam construction, water allocation plans, and flood control measures are currently pending. These projects will potentially hrther modify the hydrologic environments of the Basin, and no doubt require mitigation measures. In addition, there is genuine interest in restoring aspects of the Basin's historic hydrologic regime within some set of reasonable limits. In order to proceed with this effort, the anticipated effects of these modifications and restorations on the Basin ecology require thorough study of the area's historic hydrology, so that connectivity among Basin precipitation patterns, flow fluctuations, and land use changes can be made. A basin hydrologic characterization is an initial component of this effort. The focus of this effort was to determine and assemble the data set from which characterization of the hydrologic environments of the Basin using historic and recent water level, flow, (primarily by USGS-WRD) at locations throughout the Basin could proceed. ( Document has 11 pages.