Molecular dynamics simulations were carried out to investigate the pressure dependence of homogeneous defect nucleation behavior in bcc Mo. The crystal was sheared on the ð1 10Þ 1⁄211 1 slip system under different confining pressures. The defect nucleation stress was found to increase as the confining pressure increases. Dislocation loop was nucleated when sheared under hydrostatic compression,...

With non–equilibrium applications in mind we present in this paper (first in a series of three) a self–contained calculation of the hydrostatic pressure of the O(N) λφ4 theory at finite temperature. By combining the Keldysh–Schwinger closed–time path formalism with thermal Dyson–Schwinger equations we compute in the large N limit the hydrostatic pressure in a fully resumed form. We also calcula...

In this study, iron reduction and concomitant biomineralization of a deep-sea iron reducing bacterium (IRB), Shewanella piezotolerans WP3, were systematically examined at different hydrostatic pressures (0.1, 5, 20, and 50 MPa). Our results indicate that bacterial iron reduction and induced biomineralization are influenced by hydrostatic pressure. Specifically, the iron reduction rate and exten...

Quantum chemistry-based dipole polarizable and nonpolarizable force fields have been developed for 1,3,5-triamino-2,4,6-trinitrobenzene (TATB). Molecular dynamics simulations of TATB crystals were performed for hydrostatic pressures up to 10 GPa at 300 K and for temperatures between 200 and 400 K at atmospheric pressure. The predicted heat of sublimation and room-temperature volumetric hydrosta...

Use of membrane inlet mass spectrometers (MIMS) for quantitative measurements of dissolved gases and volatile organics over a wide range of ocean depths requires characterization of the influence of hydrostatic pressure on the permeability of MIMS inlet systems. To simulate measurement conditions in the field, a laboratory apparatus was constructed for control of sample flow rate, temperature, ...

The dependence of Tc on pure hydrostatic pressure has been determined for the first time on the recently discovered superconductor MgB2 . Using a He-gas apparatus, we find that Tc decreases under pressure to 0.5 GPa at a significantly smaller rate, dTc/dP ≃ −1.11± 0.02 K/GPa, than found in other studies under less hydrostatic pressure conditions. The value of the logarithmic volume derivative, ...