Agency Fact Sheet, Department of Cultural Affairs, FY2008

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Agency Fact Sheet, Department of Economic Development, FY2008

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Agency Fact Sheet, Department of Education, FY2008

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Agency Fact Sheet, Department of Education (only), FY2008

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Agency Fact Sheet, Department of Ethics and Campaign Disclosure Board, FY2008

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Perturbing Hele-Shaw flow with a small gap gradient

A controlled perturbation is introduced into the Saffman-Taylor flow problem by adding a gradient to the gap of a Hele-Shaw cell. The stability of the single-finger steady state was found to be strongly affected by such a perturbation. Compared with patterns in a standard Hele-Shaw cell, the single Saffman-Taylor finger was stabilized or destabilized according to the sign of the gap gradient. While a linear stability analysis shows that this perturbation should have a negligible effect on the early-stage pattern formation, the experimental data indicate that the characteristic length for the initial breakup of a flat interface has been changed by the perturbation.

Agency Fact Sheet, Department of Governor Office, FY2008

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Agency Fact Sheet, Department of Governor Office: Office only, FY2008

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Agency Fact Sheet, Department of Governor Office of Drug Control Policy, FY2008

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Seismic attenuation due to wave-induced fluid flow at microscopic and macroscopic scales

Wave-induced fluid flow at microscopic and mesoscopic scales arguably constitutes the major cause of intrinsic seismic attenuation throughout the exploration seismic and sonic frequency ranges. The quantitative analysis of these phenomena is, however, complicated by the fact that the governing physical processes may be dependent. The reason for this is that the presence of microscopic heterogeneities, such as micro-cracks or broken grain contacts, causes the stiffness of the so-called modified dry frame to be complex-valued and frequency-dependent, which in turn may affect the viscoelastic behaviour in response to fluid flow at mesoscopic scales. In this work, we propose a simple but effective procedure to estimate the seismic attenuation and velocity dispersion behaviour associated with wave-induced fluid flow due to both microscopic and mesoscopic heterogeneities and discuss the results obtained for a range of pertinent scenarios.

Agency Fact Sheet, Department of Human Rights, FY2008

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Agency Fact Sheet, Department of Human Services, FY2008

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Agency Fact Sheet, Department of Human Services: Administrative Office, FY2008

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Agency Fact Sheet, Department of Human Services: Asst. Payments, FY2008

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Agency Fact Sheet, Department of Human Services: CCUSO, FY2008

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