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213 results on '"Meadows, David"'

2. Seismic analysis of silica diagenetic boundaries : the North Sakhalin Basin, Russian Far East

Author

Meadows, David

Subjects
552.03
Abstract

The transformation of biogenic silica (opal-A) to cryptocrystalline opal-CT (cristobalite and tridymite) and subsequent transition of opal-CT to quartz are important diagenetic reactions that may occur in siliceous sediments within many sedimentary basins worldwide. These diagenetic transitions are basin-scale features and can have areal extents of 10⁴ -10⁵ km². These reactions can have a significant effect on the physical properties, especially porosity, seismic velocity and density, of the host sediment. The role played by silica diagenesis within sedimentary basins is poorly understood, but it is becoming apparent that these reactions could have significant implications for basin analysis in terms of the sedimentological and deformational history of the basin as well as for hydrocarbon exploration.

Published
2009

10. The Supreme Court of California 1976-1977

Author

McDermott, John E., Rothschild, Richard, Myers, Charles R., Lee, Ronald W., Goldsmith, Peter H., Cooper, Janet M., Mack, William F., Rindner, Mark, Chyten, Kenneth Shannon, Colton, Michael Alan, Holton, Ann Clinton, Siegelman, Joseph E., Meadows, David J., Roisman, Richard, Fujie, Holly J., Siler, Duane, Ortmeyer, Charles, and Rosenberg, Daniel C.

Published
1978
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11. Fluid flow due to the advance of basin-scale silica reaction zones

Author

Davies, Richard J., Goulty, Neil R., and Meadows, David

Subjects
Earth sciences
Abstract

The conversion of biogenic silica (opal-A) to opal-CT (cristobalite and tridymite) in biosiliceous sediment causes increased rates of water expulsion because of the reduction in sediment porosity and dehydration of the amorphous opal-A phase. This release of water occurs over large tracts of sedimentary basins during sediment burial within discrete, diagenetic, reaction zones. Analysis of two-dimensional and three-dimensional seismic data sets from basins in the Northern Hemisphere provides geophysical evidence for a variety of fluid conduits and roughly circular erosional depressions at the contemporaneous seabed. We interpret these features as indicative of water expulsion and focused fluid flow emanating from opal-A to opal-CT reaction zones at burial depths within the range 200-800 m. The rate at which water is expelled depends upon the degree of porosity reduction and the weight fraction of bound water at the reaction zone as well as the rate of advance of the reaction zone. Where the reaction is actively taking place within homogeneous biosiliceous sediment, the rate of water expulsion is independent of the reaction rate. This is because water is released across the entire reaction zone; therefore, slow reaction rates are compensated for by expulsion of water across wider reaction zones. We calculate the rate and volume of water expulsion for the Faeroe-Shetland Basin, where the sediment immediately below the reaction zone contains, on average, ~30% opal-CT by weight. The estimated volumetric rate of water expulsion per unit surface area at the present day is ~6 [m.sup.3] [My.sup.-1] per square meter, which is greater than the vertical flux of water at the same depth from compaction of the deeper basin fill. The average volumetric rate of water expulsion is ~120 [km.sup.3] [My.sup.-1] across the whole basin. Biogenic silica is particularly rich in Neogene successions in high latitude and equatorial regions, and where silica reaction zones are identified, they should be factored into sediment compaction and fluid-flow histories. Keywords: reaction zone, opal-A, opal-CT, fluid flow, diagenesis.

Published
2008

13. Morphological development of basin-scale silica diagenetic fronts revealed with 2D seismic reflection data: offshore Sakhalin, Russian Far East

Author

Meadows, David and Davies, Richard J.

Subjects
Sakhalin -- Natural history, Diagenesis -- Research, Seismic reflection method, Earth sciences
Abstract

Two-dimensional (2D) seismic reflection data reveal two silica diagenetic boundaries located in the North Sakhalin Basin, offshore Sakhalin Island. These boundaries form distinctive high-amplitude seismic reflections that predominantly cross-cut Miocene stratigraphy. The boundaries represent the opal-A to opal-CT (cristobalite and tridymite) transition and the subsequent deeper opal-CT to quartz transition and cover an area of c. 107 000 [km.sup.2]. The reflections represent diagenetic reaction fronts that advance through silica-rich host sediments during burial. The oldest strata within which the diagenetic fronts have been identified are of Miocene age and the fronts commonly show a parallel relationship to a Late Miocene unconformity. These diagenetic fronts develop a variety of morphological forms. In the North Sakhalin Basin these front geometries are probably the result of the interference of the diagenetic fronts with inclined and folded stratigraphy together with lateral changes in the composition and, therefore, depth of transformation of the sediment. We define criteria for the recognition of these 2D cross-sectional morphological elements and by so doing provide the basis for the objective description and categorization of diagenetic front geometry.

Published
2007

18. Integrating computers, reading, and writing across the curriculum

Author

Cronin, Hines, Meadows, David, and Sinatra, Richard

Subjects
Mississippi -- Social policy, Educational innovations -- Mississippi, Criterion-referenced tests -- Usage, Computer-assisted instruction -- Evaluation, Geographical perception, Computers -- Usage, Education
Published
1990

21. The ACTS NASA Ground Station/Master Control Station

Author

Meadows, David N

Subjects
Ground Support Systems And Facilities (Space)
Abstract

Two of the major components of the ACTS Ground Segment are the NASA Ground Station (NGS) and the Master Control Station (MCS), colocated at the NASA Lewis Research Center. Essentially, the NGS provides the communications links by which the MCS performs its various network control and monitoring functions. The NGS also provides telecommunications links capable of transmission/reception of up to approximately 70 Mbit/s of digital telephonic traffic. Operating as a system, the entire complex of equipment is referred to as the NGS/MCS. This paper provides an 'as-built' description of the NGS/MCS as a system.

Published
1992

22. California HMOs may provide national forecast

Author

Coyne, Joseph S. and Meadows, David M.

Subjects
Health maintenance organizations -- Finance, Financial management -- Methods, California -- Health aspects
Published
1991

26. The Explorator Newsletter ~ Spreading the News of Archaeology

Author

Meadows, David

Abstract

This resource is a single blog post created as part of the Day of Archaeology initiative. The Day of Archaeology project aimed to provide a window into the daily lives of archaeologists from all over the world. The project asked people working, studying or volunteering in the archaeological world to participate in a 'Day of Archaeology' each year by recording their day and sharing it through text, images or video on the Day of Archaeology blog.The project asked anyone with a personal, professional or voluntary interest in archaeology to get involved, and help highlight the reasons why archaeology is vital to protect the past and inform our futures. The resulting Day of Archaeology project archive demonstrates the wide variety of work the archaeological profession undertakes day-to-day across the globe, and helps to raise public awareness of the relevance and importance of archaeology to the modern world.The first ever Day of Archaeology was held in 2011 and, since then, the project had thousands of archaeologists take part in the event, from those working in the field through to specialists working in laboratories and behind computers. The last Day of Archaeology was on Friday 28th July 2017.

Published
2016
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29. Reflections from a "musical alchemist".

Author

Meadows, David G.

Abstract

The article reflects on the challenges and opportunities in the minerals industry, emphasizing the crucial role of the Mineral & Metallurgical Processing Division (MPD) in addressing future energy transition and net-zero requirements. It also outlines the chair's extensive career journey, SME involvement and highlights key achievements of the MPD Executive Committee in the past year.

Published
2024

30. U.S. Supreme Court limits primary liability under rule 10b-5 to those with 'ultimate authority' over a misleading statement

Author

Smith, Michael R., Bucholtz, Jeffrey S., and Meadows, David E.

Subjects
United States. Securities and Exchange Commission -- Management, United States. Supreme Court -- Management, Janus Capital Group Inc. -- Management, Janus Capital Management L.L.C. -- Management, Securities fraud, Banking industry, Mutual fund industry, Liability (Law), Actors, Actresses, Securities, Company business management, Banking industry, Banking, finance and accounting industries
Abstract

The authors believe that the U.S. Supreme Court's decision in Janus will be of significant importance in determining the scope of persons who can be liable in securities fraud cases., In its June 13, 2011 decision in Janus Capital Group, Inc. v. First Derivative Traders, the United States Supreme Court held, in a divided 5-4 decision authored by Justice Clarence [...]

Published
2011

31. Letters.

Author

Baker, Brian, Smith, Viv, Smith, Elaine, Rawlinson, Tony, Cray, Jon, Cornwallis, Lord, Baker-White, Mark, Tayler, Pete, Eves, John, Evans, Linda, Ashken, Peter, Rushton, Chris, Bentall, Angus, Smith, Robert, Jeffery, Julian, Turner, Peter, Meadows, David, Fowle, Roger, Hedgcock, Murray, and Green, John

Subjects
LETTERS, LOCAL finance
Published
2020

38. Reply

Author

Paugh, Jerry R., primary, Nguyen, Andrew Loc, additional, Hall, Jonathan Q., additional, Webb, Justin R., additional, Ramsey, Alison C., additional, and Meadows, David L., additional

Published
2013
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39. Molecular Structure of Interfacial Human Meibum Films

Author

Leiske, Danielle L., primary, Miller, Chad E., additional, Rosenfeld, Liat, additional, Cerretani, Colin, additional, Ayzner, Alexander, additional, Lin, Binhua, additional, Meron, Mati, additional, Senchyna, Michelle, additional, Ketelson, Howard A., additional, Meadows, David, additional, Srinivasan, Sruthi, additional, Jones, Lyndon, additional, Radke, Clayton J., additional, Toney, Michael F., additional, and Fuller, Gerald G., additional

Published
2012
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40. Correction

Author

Leiske, Danielle L., primary, Leiske, Christopher I., additional, Leiske, Daniel R., additional, Toney, Michael F., additional, Senchyna, Michelle, additional, Ketelson, Howard A., additional, Meadows, David L., additional, and Fuller, Gerald G., additional

Published
2012
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45. Not All Anionic Polyelectrolytes Complex with DTAB

Author

Cui, Yuguo, primary, Pelton, Robert, additional, Cosgrove, Terence, additional, Richardson, Robert, additional, Dai, Sheng, additional, Prescott, Stuart, additional, Grillo, Isabelle, additional, Ketelson, Howard, additional, and Meadows, David, additional

Published
2009
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49. Poster 20

Author

Garofalo, Renee J., primary, Dassanayake, Nissanke, additional, Carey, Chris, additional, Lemp, Jessie M., additional, Devenport, Jenny N., additional, and Meadows, David L., additional

Published
2007
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50. Poster 54

Author

Chen, Huagang, primary, Gan, Owen, additional, Meadows, David, additional, Meyer, Ann, additional, and Baier, Robert E., additional

Published
2007
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