The Anglo-Norman aristocracy under divided Lordship, 1087-1106: a social and political study

This thesis examines the political and social responses of the Anglo-Norman aristocracy between 1087 and 1106 to the issue of divided lordship. The central theme is the importance of the concept of political legitimacy in shaping the political culture and actions of the aristocracy during this period. The exclusion of significant sections of the cross-Channel aristocracy from the consultation process in selecting a king in 1087 and 1100, ran contrary to the accepted political norms and created doubts over the legitimacy of Rufus’ and Henry I’s regimes that could be revived at moments of crisis. This found expression in the support given to Robert Curthose’s challenge for the English throne in 1088 and 1101, but also in open rebellion in 1095. However, the limitations of violence as a means of effecting long-term change necessitated a search for a negotiated political settlement that would open the way for Normandy and England to enjoy co-existence as a permanent solution to the problem of divided lordship. This approach locates the Anglo-Norman aristocracy firmly within the recent scholarship of the early and late medieval aristocracy, where political discourse is analysed primarily in terms of succession and legitimacy. Therefore, at the centre of this analysis are the contemporary and near-contemporary narrative sources, which display a firm understanding of contemporary theories of kingship and the politics. When brought into focus with charter evidence, specific aspects of the wider socio-political culture of the aristocracy, in particular religious patronage, marital strategies and inheritance patterns, can then be read as both responses to the wider question of the succession, and also as a commentary on contemporary politics

In-Stream Structures Integrity and Channel Stability Survey and Evaluation

ODOT SPR Item Number 2311Streambank erosion can damage bridges, hydraulic structures, and private property. In-stream structures may be installed to control river migration and limit bank erosion during large precipitation events. Historically, the structures most widely used by the Oklahoma Department of Transportation include Kellner jetties, rip rap, pile diversions, and bendway weirs. These structures each use different methods to decrease erosion and stream migration; therefore, their effectiveness may differ based on a variety of variables including stream geomorphology, site and watershed characteristics, and occurrence of extreme precipitation events. Many of these structures have been installed on Oklahoma rivers but have not been consistently evaluated. Previously, two studies completed by the Oklahoma Department of Transportation and the University of Oklahoma in 1971 and 1989 have qualitatively evaluated the effectiveness of over 20 in-stream structures near transportation infrastructure. In this project, remote evaluations of the characteristics of the streams and watersheds, along with on-site stream surveys and geomorphological studies, were completed. This project augments and enhances the previous studies through quantitative analyses of the durability of the structures, stream characteristics, and stream geomorphology. Logistic regressions indicated that soil type and structure design impact the success of different structures. Pile diversions were more likely to fail on rivers with more sand, potentially due to the mobility of a sandy river bed. Kellner jetties failed more frequently with smaller angles between the stream flow line and the Kellner jetty lines. Overall, structures were more successful in streams with higher silt content in their bank material. This data can be used in the future for making decisions surrounding streambank stabilization projects in Oklahoma. The results of this study provide a unique opportunity to optimize the likelihood of successful implementation of in-stream structures in rivers with varying characteristics

Proceedings IMWA 2010

Abstract A research-grade passive treatment system was constructed to receive 1000 L/minute of mine water from abandoned boreholes (pH 5.95, net alkalinity 29 mg/L CaCO₃, Fe 192 mg/L, Zn 11 mg/L, Cd 17 μg/L, Pb 60 μg/L and As 64 μg/L). The 2-ha system includes an oxidation pond followed by parallel treatment trains of aerobic wetlands, vertical flow bioreactors, re-aeration ponds, and horizontal-flow limestone beds and a final polishing wetland. Final effluent waters had pH >7 and contained < 1 mg/L total Fe and < 0.1 mg/L total Zn, with concentrations of Cd, Pb and As below detectable limits. Key Words hard rock mining, metal mining, acid mine drainage, natural treatment systems Introduction This paper describes the initial evaluation of an innovative, ecologically engineered passive system designed to treat abandoned ferruginous Pb-Zn mine waters at the Tar Creek Superfund Site, part of the historic Tri-State Mining District (TSMD) of Oklahoma, Kansas and Missouri, USA. Significant quantities of Pb and Zn were produced from the TSMD from the 1890s through the 1960s. By the early 1970s when mining ceased, two and nine million tons of Pb and Zn, respectively, had been produced During mining, large capacity dewatering operations pumped approximately 50,000 m³ d⁻¹ of water from the mines (Reed et al. 1955). Upon decline and cessation of mining, groundwater began to accumulate in the mine voids. By late 1979, metal-rich waters began to discharge via artesian pressure into Tar Creek and its tributaries. The first documented discharges of mine drainage were at a location near southeast Commerce, OK (Oklahoma Water Resources Board 1983) and were subsequently identified for passive treatment implementation Methods For this study, periodic water quality and quantity data collection efforts for the subject discharges began in 1998, with regular monthly sampling beginning in 2004 and continuing to the present. The targeted discharges have circum-neutral pH (5.96 ± 0.06), total alkalinity of 405 ± 13 mg/L as CaCO₃ and combined flow rates of up to 1000 L/minute. Metals and sulfate concentrations are elevated above expected levels and degrade the receiving waters ). Design and construction details for the passive treatment system are summarized in Sydney, NS IMWA 2010 "Mine Water and Innovative Thinking" Wolkersdorfer & Freund Results and Discussion In the year of operation, the passive treatment system performed as designed from a water quality perspective ( Other metals of specific interest in these waters were Cd, Pb, and As. All three were removed to below detection limits (0.64, 19.5 and 22 µg/L, respectively) before the outflow of the second process units, presumably through sorptive processes. Although the vertical-flow bioreactors were designed to remove Cd and Pb as well as Zn, Cd and Pb rarely remained in measureable concentrations at this stage of the treatment system. The other trace metal found in significant concentrations in these waters was Ni. A small percentage (<10%) of Ni was removed through co-precipitation and sorption in Cell 1. However, the majority of Ni (≈ 95%) was removed via re- IMWA 2010 Sydney, NS "Mine Water and Innovative Thinking&quot

Interactions between bacterial surfaces and milk proteins, impact on food emulsions stability

Bacteria possess physicochemical surface properties such as hydrophobicity, Lewis acid/base and charge which are involved in physicochemical interactions between cells and interfaces. Moreover, food matrices are complex and heterogeneous media, with a microstructure depending on interactions between the components in media (van der Waals, electrostatic or structural forces, etc.). Despite the presence of bacteria in fermented products, few works have investigated how bacteria interact with other food components. The objective of the present study was to determine the effects of the surface properties of lactic acid bacteria on the stability of model food emulsions. The bacteria were added to oil/water emulsions stabilized by milk proteins (sodium caseinate, whey proteins concentrate or whey proteins isolate) at different pH (from 3 to 7.5). The effect of bacteria on the emulsions stability depended on the surface properties of strains and also on the characteristics of emulsions. Flocculation and aggregation phenomena were observed in emulsion at pHs for which the bacterial surface charge was opposed to the one of the proteins. The effects of bacteria on the stability of emulsion depended also on the concentration of cations present in media such as Ca2+. These results show that the bacteria through their surface properties could interact with other compounds in matrices, consequently affecting the stability of emulsions. The knowledge and choice of bacteria depending on their surface properties could be one of the important factors to control the stability of matrices such as fermentation media or fermented products.Région Bourgogne, Agence Universitaire de la Francophonie