978 resultados para Miller, Richard L.
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One of the objectives of drilling at Site 1179 was to search for microbes or biochemical evidence of microbial activity as part of the ongoing exploration of the depth and extent of the deep biosphere. The existence of living microbes has not been confirmed, but the chemistry of pore waters from the site, such as sulfate and ammonium profiles, is consistent with sulfate reduction and nitrification by anaerobic bacteria. However, chemical profiles are affected by the movement of molecules and ions through porous sediments by diffusion and advection. Permeability is thus an important consideration in the interpretation of pore water chemistry profiles. Moreover, diatomaceous sediments have some unique and, as yet, poorly understood physical properties. The purpose of this research is to measure hydraulic conductivity (permeability) in a suite of sediment samples from Ocean Drilling Program Site 1179 by the transient-pulse method. The sample set consists of four diatom ooze samples from Unit I, one radiolarian ooze sample from Unit II, and one pelagic clay sample from Unit III. The permeability of the clay is 1.92 µd, whereas the permeabilities of the overlying radiolarian and diatom oozes range from 289 to 1604 µd. Among these samples, permeability increases with porosity and grain size, in keeping with the results of previous studies.
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Laboratory measurements of physical properties are important because the results may be applied to the interpretation of seismic and other types of geophysical data, and because they can be used to estimate the in situ physical properties of different lithologies present beneath the sea floor. In this chapter, wet-bulk densities and compressional-wave velocities, measured at elevated confining pressures, are reported for a suite of seven sediment samples recovered on DSDP Leg 60. Of the seven samples studied, two are mudstones, two are vitric tuffs, and three are chalks. All but one of the samples are from Hole 459B, near the eastern limit of the Mariana fore-arc region. In five cases, velocities were measured parallel and perpendicular to bedding to test for velocity anisotropy.
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Front Row: Michael W. Darland, Thomas W. Pederson, Eric A. Peper, C. Matthew Chelich, Fernando J. Canales, Robert F. Murray, Kevin V. Williamson
2nd Row: Richard L. Carter, Paul W. Griffith, Scott D. Weir, Kenneth J. Vigiletti, Jonathan K. Menegay, Kevin A. Morgan, David L. Price, Bill Mills, James F. Derks
3rd Row: swimming coach Gus Stager, Jon Beach, Kevin Machemer, Brent Campbell, Lance Weissmann, Matt Kanzler, Tom D. Dudley, Jr., R. Scott Crowder, III., Walter H. Gage, III, diving coach Dick Kimball
Back Row: Rich D. Hitt, Jr., Jamie Gentile, John L. Spaid, Mark McMann, Mike Wilson, Michael W. Dauw, John E. Slykhouse, Eric Yamauchi, Andy Griffith, Thomas D. Ernsting, Bruce Temme
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Federal Highway Administration, Washington, D.C.
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National Highway Traffic Safety Administration, Washington, D.C.
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National Highway Traffic Safety Administration, Washington, D.C.
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Mode of access: Internet.
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Mode of access: Internet.
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"March 1980."
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National Highway Traffic Safety Administration, Washington, D.C.
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At head of title: "Repair, Evaluation, Maintenance, and Rehabilitation Research Program."
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Federal Highway Administration, Office of Safety and Traffic Operations Research and Development, McLean, Va.
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Federal Highway Administration, Office of Safety and Traffic Operations Research and Development, McLean, Va.
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