Thermodynamics of the adiabatic expansion of a mixture of two phases.
Thermodynamics of adiabatic expansion of mixture of two phases capable of interchanging heat and matter across phase boundary
Ahrens, T. J.↗
Engineering topics
Ahrens, T. J.
Publications and source records attributed to Ahrens, T. J..
Large-scale plane wave shock experiments designed for sample recovery
Prototype explosive assembly for large scale plane wave shock experiments on rock specimen in laboratory
SHOCK WAVE GENERATOR↗
Large-scale plane wave shock experiments designed for sample recovery
Planar shock wave test assembly for simulating meteoritic impact on planetary rock surface
METEORITE COLLISION↗
Ultrasonic Observation of the Calcite-Aragonite Transition
Elastic-wave velocities were measured as a function of pressure by ultrasonic pulse Interferometry in Solenhofen and Manilus limestone specimens to pressures of 27 and 38 kb. Longitudinal velocities decrease sharply from 5.3 km/sec at a mean pressure of 4 kb to a minimum of 4.8 km/sec at 8 kb. Transverse velocities decrease from 3.1 to 2.9 km/sec. At the minimum bulk and rigidity moduli are 25 and 20 per cent below their 4-kb values. A density increase of 1.7 per cent is associated with this minimum. The observed effects are attributed to the calcite-aragonite transition, and they may be due to an inherent property of the material, a component of which undergoes a polymorphic transition, the low- and high-pressure phases coexisting over a considerable pressure range. This may be an additional mechanism to account for low-velocity zones in the earth?s interior.
POLYMORPHISM↗
AN ULTRASONIC INTERFEROMETER FOR HIGH-PRESSURE RESEARCH
Ultrasonic interferometer for high-pressure research
INTERFEROMETER↗