Results 281 to 290 of about 25,000,871 (351)
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Hydrothermal Systems in Small Ocean Planets
Astrobiology, 2007We examine means for driving hydrothermal activity in extraterrestrial oceans on planets and satellites of less than one Earth mass, with implications for sustaining a low level of biological activity over geological timescales. Assuming ocean planets have olivine-dominated lithospheres, a model for cooling-induced thermal cracking shows how variation ...
Vance, Steve +5 more
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Applied Energy, 2019
Hydrothermal pretreatment is an efficient approach to enhance methane production from microalgae biomass by anaerobic digestion. However, the high energy consumption hinders the development of hydrothermal pretreatment.
C. Xiao +9 more
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Hydrothermal pretreatment is an efficient approach to enhance methane production from microalgae biomass by anaerobic digestion. However, the high energy consumption hinders the development of hydrothermal pretreatment.
C. Xiao +9 more
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Subvolcanic hydrothermal systems: Implications from hydrothermal minerals in hydrovolcanic ash
Journal of Volcanology and Geothermal Research, 2005Abstract Hydrothermal minerals, including silica, 7 A-kaolin minerals, pyrophyllite, di-octahedral smectite, and alunite in ash of phreatic/phreatomagmatic eruptions from eight volcanoes in Northeastern Japan were derived from subvolcanic hydrothermal systems.
T. Ohba, Y. Kitade
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Titanium complexation in hydrothermal systems
Geochemistry International, 2006The solubility of rutile in aqueous solutions of HCl, HF, H2SO4, NaOH, and NaF was determined at 500°C, 1000 bar, and hydrogen fugacity from 8 × 10−12 to 10.3 bar (Mn3O4/Mn2O3 and Ni/NiO buffers, dissolution of an Al batch weight). The experimentally determined solubility values were used to calculate the constants of the following equilibria at 500°C ...
B. N. Ryzhenko +2 more
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Submarine Hydrothermal Mineral Systems
2009Present-day, active submarine hydrothermal effluents, at spreading centres (mid-ocean ridges) and in oceanic volcanic arcs and back-arcs, are of considerable interest because they provide a window into ore systems of the ancient geological record that are interpreted to have originated from submarine fluids venting.
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Economic dispatch on hydrothermal systems
2017 IEEE Central America and Panama Student Conference (CONESCAPAN), 2017Este articulo presenta los conceptos del despacho economico de un sistema hidrotermico de generacion; y la forma en la que se busca una solucion a este complejo problema, por medio de la operacion optima de los embalses de agua, a determinado plazo, lo cual nos permite encontrar el punto estrategico en el cual se mantenga en equilibrio los valores ...
A S. Cerna, S. A. Espinoza, E. Dvicente
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Uranium Hydrothermal Mineral Systems
2009A chapter specifically dealing with uranium hydrothermal mineral systems is appropriate, not only because of its inherent scientific value, but also because of the evolving economic, social and political paradigms at the start of the 21st century. Uranium, not withstanding its belligerent and senseless use (why thousands of nuclear warheads are made ...
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The Kakanui hydrothermal system.
2016Potential hydrothermal deposits were recognised within the late-Eocene to early-Oligocene volcanic tuff and overlying volcaniclastic grit at Kakanui South Head, Oamaru, New Zealand. The deposits included discrete pink carbonate pods within the volcanic tuff, discrete infilled cavities within the overlying volcaniclastic grit and a sub-horizontal ...
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A Dynamic Hydrothermal Experimental System
OCEANS '78, 1978A unique dynamic hydrothermal system has been built to study the alteration reactions between seawater and basalt in the temperature range of 0 to 180\deg C. The purpose of the system was to approximate in the laboratory the type of geochemical reactions which would occur in a submarine hydrothermal circulation of seawater at active mid-ocean spreading
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Chemistry of seafloor hydrothermal systems
Reviews of Geophysics, 1987The past four years saw advances in a number of aspects of hydrothermal chemistry. High temperature venting was documented at a number of sites, in association with the spectrum of seafloor volcanic activity: slow to fast spreading normal ridges, seamounts, back arc settings; sediment‐hosted and sediment‐starved sites.
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