04/01650 The burnup capabilities of the deep burn modular helium reactor analyzed by the Monte Carlo continuous energy code MCB: Talamo, A. et al. Annals of Nuclear Energy, 2004, 31, (2), 173–196

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<ul><li><p>16 Fuel science and technology (fundamental science, analysis, instrumentation) </p><p>their expected abundance in tissue samples. Animal tissue samples showed variable PCB patterns and abundances although all animals were expected to have been exposed to Aroclor :~) 1260. These characteristics are thought to be related to the structure of the food web or metabolic and physiological features of the individual animals. Grass carp samples had excellent correlation in the isotopic compo- sitions of the congeners. Although the correspondence of 613C in congeners from fresh Aroclor 1260 to congeners from tissue samples may not be expected to be identical, the patterns of similarity were very supportive of the maintenance of the isotopic signal into the food chain. The patterns observed in these and other samples suggest a fraetionation process where residual congener pools can become progressively enriched while the congeners produced from degradation are more depleted. The isotopic patterns provide insight to degradation processes and into relative metabolic stability of the various congeners in different animals. The results of this study suggest that CSIA analysis of PCBs at natural abundance can provide significant insight into tracing these compounds through the natural environment. The data also suggest that tracking PCB mixtures may be possible using CSIA techniques after standard chromatographic matching or other fingerprinting techniques become blurred. </p><p>0401647 Stability analysis of rotor-bearing systems via Routh-Hurwitz criterion E1-Marhomy, A. A. and Abdel-Sattar, N. E. Applied Energy, 2004, 77, (3), 287-308. A method of analysis is developed for studying the whirl stability of rotor-bearing systems without the need to solve the governing differential-equations of motion of such systems. A mathematical model, comprised of an axially symmetric appendage at the mid-span of a spinning shaft mounted on two dissimilar eight-coefficient bearings, is used to illustrate the method. Sufficient conditions for asymptotic stability of both the translational and rotational modes of motion of the system have been derived. The system's stability boundaries, presented graphically in terms of the various system non-dimensionalized parameters, afford a comprehensive demonstration of the effects of such parameters on the system's stability of motion. </p><p>04/01648 Stimulation experiments in sedimentary, Iow- enthalpy reservoirs for geothermal power generation, Germany Legarth, B. et al. Geothermics, 2003, 32, (4-6), 487-495. Hydraulic stimulation experiments were conducted in a re-used Rotliegend well situated in the eastern part of the North German Basin. The well is used as an 'in-situ geothermal laboratory' and as a reference location for several ongoing research projects. The aim of the projects and experiments is to develop technologies that will put primary low-productive aquifer structures into use for geothermal power generation. The frac operations in 2002 were designed to enhance the inflow performance by connecting the well to productive reservoir zones. Two consecutive zones within the Rotliegend sandstones were selected. Here core measurements show the most promising petrophysical reservoir properties with respect to a productivity increase. The stimulation treatments were performed as hydraulic proppant fracturing operations. Proppants were used to support the fractures and to guarantee a long-term fracture aperture. The treatment intervals are located in the open-hole section of the well at depths between 4080 m and 4190 m and at temperatures of about 140C. The technical demands were therefore unprecedented in these challenging conditions. An open-hole-packer at the top and a sand plug at the bottom of each interval were used as hydraulic barriers. Applying this configuration the intervals were fracture-treated by injecting about 11 tonnes of proppant (high-strength ceramic grains) and over 200 m 3 of frae fluid (highly viscous gel) into the formation. The fracture treatments were conducted by means of two successive operations in each interval: first, a diagnostic treatment (datafrac), followed by the main treatment (mainfrac) with the proppant stages. The frac operations were successful. Propped fractures were created in both intervals and the inflow behaviour of the reservoir was decisively enhanced. The effective pressures applied for fracture initiation and propagation were only slightly above the in-situ pore pressures. The stimulation ratio predicted by modelling, however, could not be achieved. There were a number of reasons for this mismatch. Probably chemical and mechanical processes during closure led to a reduced fracture conductivity. The insights gained from the experiments are important for future fracture treatment projects on this site and in comparable locations. </p><p>ment, infrared spectroscopy, potentiometric titration, copper adsorp- tion from solution and physical adsorption of N2 at -196C and CO2 at 0C. It was shown that, similarly to synthetic phosphoric acid activated carbons obtained in argon, the synthetic carbons activated with phosphoric acid in air possess an acidic character and show considerable cation-exchange properties. The contribution of oxygen- containing surface groups along with phosphorus-containing groups to CEC is higher for carbons obtained in air. Three types of surface groups were identified on carbons prepared at temperatures up to 600C, and four types on carbons prepared at higher temperatures. These groups were assigned to 'super-acidic' (pK</p></li></ul>


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