The pressure and temperature stability limits of lawsonite: implications for H2O recycling in subduction zones

1994 ◽  
Vol 118 (1) ◽  
pp. 99-108 ◽  
Author(s):  
Alison R. Pawley
Keyword(s):  
Subduction Zones ◽  
Temperature Stability ◽  
Stability Limits

Low-temperature stability limits for the liquid state

1978 ◽  
Vol 18 (3) ◽  
pp. 1272-1276 ◽  
Author(s):  
J. M. Gordon
Keyword(s):  
Low Temperature ◽  
Liquid State ◽  
Temperature Stability ◽  
Stability Limits

Compound Semiconductor Applications for Automotive Sensors

1999 ◽  
Vol 607 ◽  
Author(s):  
M. W. Pelczynski ◽  
J. J. Heremans ◽  
S. Schwed
Keyword(s):  
Magnetic Circuit ◽  
Temperature Stability ◽  
High Sensitivity ◽  
Ignition Timing ◽  
Temperature Drift ◽  
Sensing Applications ◽  
Temperature Operating ◽  
Stability Limits ◽  
Misfire Detection ◽  
Higher Sensitivity

AbstractCompound semiconductors find extensive application as magnetic position sensors in the automotive environment. Typical applications involve the sensor element, a permanent magnet attached to the sensor, and a moving magnetic circuit -a target wheel. Wider mechanical gaps in the magnetic circuit can be utilized with a sensor of higher sensitivity, and thus high sensitivity is valuable. Further limitations on the choice of materials are imposed by temperature sensitivity, as the automotive environment is characterized by wide temperature operating ranges (-40°C up to 200°C). The magnetic signal may be hidden by the temperature drift in the sensor output, andthus temperature stability limits the sensor's resolution. Automotive position sensors find use in ignition timing and misfire detection (cam and crank sensors), as wheel speed sensors (anti-lock brakes and other types of active wheel-control), in brushless electric motors and several other applications. This work reviews progress achieved to refine the use of InSb for automotive sensing applications.

Numerical Simulations of Temperature Stability Limits in High-Voltage Direct Current Cable Insulations

2019 ◽  
Vol 55 (6) ◽  
pp. 1-4 ◽  
Author(s):  
Christoph Jorgens ◽  
Fotios Kasolis ◽  
Markus Clemens
Keyword(s):  
Numerical Simulations ◽  
High Voltage ◽  
Direct Current ◽  
Temperature Stability ◽  
High Voltage Direct Current ◽  
Stability Limits

scholarly journals The Fiskenæsset complex, West Greenland. Part IV. Chemistry of sulphide minerals

1980 ◽  
Vol 137 ◽  
pp. 1-35
Author(s):  
F.C Bishop ◽  
J.V Smith ◽  
B.F Windley
Keyword(s):  
Equilibrium Phase ◽  
Temperature Stability ◽  
X Ray Diffraction ◽  
West Greenland ◽  
Igneous Intrusions ◽  
Original Magma ◽  
Silicate Chemistry ◽  
The Common ◽  
Equilibrium Pair ◽  
Stability Limits

The textures and chemistry of sulphides were investigated in 63 rocks from the Fiskenæsset complex, West Greenland, by light microscopy, electron microprobe, and X-ray diffraction techniques. Sulphides are found disseminated throughout the layered sequence, being especially concentrated in the ultramafic zone and in ultramafic lenses in the higher zones. Sulphide phases are restricted to the Cu-Fe-Ni-Co-S system – pentlandite, pyrrhotite, chalcopyrite, pyrite, millerite, heazlewoodite, cobalt-pentlandite, polydymite, godlevskite, violarite, cubanite, and digenite. Most sulphides occur interstitially as rounded globules often containing significant quantities of oxides. Some aggregates occur as inclusions in silicate or chromite, as ragged stringers between other phases, or with scalloped intercumulus textures. Subsolidus reactions are common; fine-scale intergrowths of pentlandite-pyrite, chalcopyrite-pyrite, chalcopyrite-cubanite, pentlandite-heazlewoodite and pentlandite-godlevskite-polydymite occur. Euhedral pyrite is found in the anorthosites and chromitites. Pyrite-millerite appears to be an equilibrium pair in some rocks. Weathering affects the major phases in the following order: pyrrhotite > chalcopyrite > pentlandite. Temperature stability limits for several of the phases, equilibrium phase assemblages, and textures of the sulphide intergrowths, all indicate that the sulphides have re-equilibrated to low temperatures. The common pyrite-pentlandite assemblage places a 230°C upper limit, and the digenite composition places a 125°C lower limit, on the temperature of equilibration. A marked sulphide stratigraphy which correlates with silicate chemistry is present in the Fiskenæsset complex. There is a systematic progression from Ni,Fe-rich sulphides in the lower ultramafic and mafic zones to Cu,S-rich assemblages in the upper, more felsic zones. Sulphide fractionation exhibiting some of these features is also found in other layered igneous intrusions. The similarity of the Fiskenæsset sulphides with those in other intrusions, coupled with the unlikely possibility of derivation of the sulphides by assimilation or metasomatism, implies that the sulphides were derived from the original magma.

scholarly journals Water transfer to the deep mantle through hydrous, Al-rich silicates in subduction zones

Geology ◽  
2021 ◽  
Author(s):  
Jörg Hermann ◽  
Shayne Lakey
Keyword(s):  
Deep Water ◽  
Subduction Zones ◽  
Water Cycle ◽  
Temperature Stability ◽  
Water Transfer ◽  
Critical Conditions ◽  
Water Recycling ◽  
Secular Equilibrium ◽  
Order Problem ◽  
Deep Mantle

Constraining deep-water recycling along subduction zones is a first-order problem to understand how Earth has maintained a hydrosphere over billions of years that created conditions for a habitable planet. The pressure-temperature stability of hydrous phases in conjunction with slab geotherms determines how much H2O leaves the slab or is transported to the deep mantle. Chlorite-rich, metasomatic rocks that form at the slab-mantle interface at 50–100 km depth represent an unaccounted, H2O-rich reservoir in subduction processes. Through a series of high-pressure experiments, we investigated the fate of such chlorite-rich rocks at the most critical conditions for subduction water recycling (5–6.2 GPa, 620–800 °C) using two different natural ultramafic compositions. Up to 5.7 GPa, 740 °C, chlorite breaks down to an anhydrous peridotite assemblage, and H2O is released. However, at higher pressures and lower temperatures, a hydrous Al-rich silicate (11.5 Å phase) is an important carrier to enable water transfer to the deep mantle for cold subduction zones. Based on the new phase diagrams, it is suggested that the deep-water cycle might not be in secular equilibrium.

Petrologic and geochemical role of serpentinite in subduction zones and plate interface domains

2015 ◽  
Vol 37 ◽  
pp. 61-64
Author(s):  
Marco Scambelluri ◽  
Enrico Cannaò ◽  
Mattia Gilio ◽  
Marguerite Godard
Keyword(s):  
Subduction Zones ◽  
Plate Interface

Diamonds from the Alps reveal carbon mobility in subduction zones

2015 ◽  
Vol 37 ◽  
pp. 28-30
Author(s):  
Maria Luce Frezzotti
Keyword(s):  
Subduction Zones ◽  
The Alps

Analysis of LPG diffusion flame in tube type burner

2019 ◽  
Vol 13 (3) ◽  
pp. 5278-5293
Author(s):  
Vipul Patel ◽  
Rupesh Shah
Keyword(s):  
Diffusion Flame ◽  
Emission Characteristic ◽  
Flame Stability ◽  
Liquefied Petroleum Gas ◽  
Air Velocity ◽  
Length Fraction ◽  
Low Emission ◽  
Tube Type ◽  
Stability Limits ◽  
Co Emission

The present research aims to analyse diffusion flame in a tube type burner with Liquefied petroleum gas (LPG) as a fuel. An experimental investigation is performed to study flame appearance, flame stability, Soot free length fraction (SFLF) and CO emission of LPG diffusion flame. Effects of varying air and fuel velocities are analysed to understand the physical process involved in combustion. SFLF is measured to estimate the reduction of soot. Stability limits of the diffusion flame are characterized by the blowoff velocity. Emission characteristic in terms of CO level is measured at different equivalence ratios. Experimental results show that the air and fuel velocity strongly influences the appearance of LPG diffusion flame. At a constant fuel velocity, blue zone increases and the luminous zone decreases with the increase in air velocity. It is observed that the SFLF increases with increasing air velocity at a constant fuel velocity. It is observed that the blowoff velocity of the diffusion flame increases as fuel velocity increases. Comparison of emission for flame with and without swirl indicates that swirl results in low emission of CO and higher flame stability. Swirler with 45° vanes achieved the lowest CO emission of 30 ppm at Φ = 1.3.

Sign in / Sign up

Export Citation Format

Share Document