Results 201 to 210 of about 4,838 (230)
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Distribution of plasma density and potential around a mesothermal ionospheric object
Journal of Geophysical Research: Space Physics, 1989For an object moving at mesothermal speeds in a collisionless plasma it is shown that the ion thermal motion as well as the coupling of the disturbances in front of the object to the wake region play significant roles in modifying the plasma environment around the object.
Legesse Senbetu, John R. Henley
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Colloidal gold and silica in mesothermal vein systems
Geology, 1993Some of the textural features of mesothermal gold-quartz veins may be best explained by the initial precipitation of amorphous silica gel (colloid), which subsequently crystallizes to quartz. This can occur in brittle-ductile shear zones where a significant fluid-pressure drop occurs during stick-slip failure.
Jamie J. Wilkinson, Richard Herrington
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Journal of Basic Microbiology, 2012
AbstractThe microbial diversity of production waters of five Tunisian oilfields was investigated using Single Strand Conformation Polymorphism (SSCP) technique followed by cloning‐sequencing. Dynamics of bacterial populations in production waters collected from four wellheads were also evaluated.
Mnif, Sami +4 more
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AbstractThe microbial diversity of production waters of five Tunisian oilfields was investigated using Single Strand Conformation Polymorphism (SSCP) technique followed by cloning‐sequencing. Dynamics of bacterial populations in production waters collected from four wellheads were also evaluated.
Mnif, Sami +4 more
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Compositions of microbial communities associated with oil and water in a mesothermic oil field
Antonie van Leeuwenhoek, 2011Samples of produced water and oil obtained from the Enermark field (near Medicine Hat, Alberta, Canada) were separated into oil and aqueous phases first gravitationally and then through centrifugation at 20°C in an atmosphere of 90% N(2) and 10% CO(2).
Yuriy Kryachko +3 more
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Crustal Hydrothermal Fluids and Mesothermal Mineral Deposits [PDF]
, 1992 In this chapter we examine a broad category of hydrothermal mineral deposits whose principal characteristic is their strong structural control, and whose genesis is attributed to the action of deep-circulating crustal fluids. The mineralisation is hosted in a variety of lithologies metamorphosed to lower-upper greenschist facies, and less commonly to ...
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Alteration of biotite under mesothermal conditions
Economic Geology, 1958The complex chemical composition of biotite is doubtless the cause of a variety of alteration products when it has been altered by hydrothermal solutions at moderate temperatures and pressures. As a rule biotite is unstable under hydrothermal conditions and alters to numerous minerals that seem to depend primarily on the composition of the solution at ...
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Deformational controls on the dynamics of fluid flow in mesothermal gold systems
Geological Society, London, Special Publications, 1999Abstract Coupling between deformation processes and rock permeability is a major factor influencing fluid migration and fluid-rock interaction during the formation of mesothermal lode gold systems in mid- to upper crustal regimes. The evolution of permeability during deformation is controlled by a dynamic competition between deformation ...
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Mesothermal plasma flow around a negatively wake side biased cylinder
Journal of Geophysical Research: Space Physics, 1991We have made a numerical investigation of the wake potential and density perturbations caused by the presence of a large negative voltage on a sector situated on the wake side of a spacecraft moving at orbital speed through the ionosphere. The spacecraft is represented as an infinite cylinder moving in an unmagnetized plasma. The rest of the cylinder's
Éric Coggiola, Amaury Soubeyran
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Current Coupling Via Electron Emission in Fast and Mesothermal Ion Beams [PDF]
2018 IEEE International Conference on Plasma Science (ICOPS), 2018 Ion beam neutralization during operation of ion sources requires current coupling between beam ions and electrons from the neutralizer. The current and charge density equalization during neutralization is accomplished in practice, however, the exact process has not been adequately simulated/understood due to the wide range of conditions.
Nikolaos A. Gatsonis +2 more
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Rapid dewatering of the crust deduced from ages of mesothermal gold deposits [PDF]
Nature, 1991 THE large-scale migration of fluids through the continental crust has been well documented, but there is no consensus regarding the timing of fluid migration relative to orogenic episodes, or rates of crustal dewatering1. Here we present40Ar/39Ar dates for muscovites from quartz veins along a major shear zone in southeast Alaska, which show that the ...
Richard J. Goldfarb +3 more
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