166 research outputs found
Situation determination with distributed context histories
No full textDetermining the situation within an environment is a key goal of smart environment research. A significant challenge in situation determination is reasoning about openended groups of people and devices that a smart environment may contain. Contemporary solutions are often tailored to the specific environment. In this position paper, we present a novel general situation determination framework, that by viewing people and tools as playing roles in a situation, can easily adapt recognition to incorporate the dynamic structure of a situation over time
Cleavage force as a function of separation in a finite model of silicon with a chemically bonded force field
No full textA finite cleaved model of silicon has parallel faces at separation a + z, with a the original interplanar spacing perpendicular to the cleavage plane. The cleavage force F(z) is proportional to z for small z and, due to van der Waals interaction, falls off at large z as z− 3. In the present work, for a finite block of Si, an estimate is presented of the maximum value of F(z), and its corresponding position zmax, using coordination dependent interatomic potentials. The position zmax is found to accord semiquantitatively with that separation required to break the covalent bond in the H2 molecule
Electron correlation effects reflected in thermodynamic properties of light actinides
No full textAbstract: Experimentally available thermodynamic data on the light actinides is used to display the ratio B Omega=k(B)T(m) from Th through to Cm. Dramatic variation through the series by a factor of 4 contrasts strongly with that found for the five heavy rare earth solids, also involving f-electrons, where the same ratio is approximately 50 to within a few percent
Simulation-based Determination of Relative Permeability in Laminated Rocks
No full textAbstractReservoir simulation using the extended Darcy's law approach requires relative permeability curves derived either via analytic saturation functions (Corey models etc.) or from special core analysis (SCAL). Since such experimental exploration of the space of influential parameters (pore geometry and wettability) is costly and time consuming, establishing ways to extract ensemble relative permeability from numerical simulation, kri, over the entire range of water saturation is highly desirable. In this work, a Steady State Saturation Variation (SSSV) technique is proposed. It computes ensemble kri(sw) for layered rocks when both capillary and viscous forces are strong
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