Survey spectra of single-crystal HMX (octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine), RDX (hexahydro-1,3,5-trinitro-1,3,5-triazine), and PETN (pentaerythritol tetranitrate) were acquired in the region from 10 to 80 cm(-1) using terahertz time-domain spectroscopy. The spectra were taken at temperatures ranging from 8.4 to 300 K. Generally, the spectra show multiple absorption peaks in the ran...

This paper presents results of first-principles density functional calculations of the equation of state (EOS) of PETN-I and P-HMX. The isotropic EOS for hydrostatic compression has been extended to include uniaxial compressions in the [100], [010], [001], [110], [101], [Oil], and [111] directions up to compression ratio VAAQ = 0.70. Equilibrium properties, including lattice parameters and elas...

Detonation Shock Dynamics (DSD), involved in an underwater explosion scenario is numerically simulated by in-house computer code, ‘DSSDYN’. The simulation based on Chapman-Jouguet (CJ) theory, formulated Arbitrary Lagrangian Eulerian frame work. Specifically, the propagation of detonation front with‘Burn Fraction Model’. classical burn fraction model improved for achieving better computational ...

A numerical simulation study was performed to examine the post-detonation reaction processes produced by detonation of a 12 mm diameter hemispherical pentaerythritol tetranitrate (PETN) explosive charge. The simulations used finite rate detailed chemical model consisting 59 species and 368 reactions capture including air dissociation from Mach 19+ shock waves that initially break out PETN charg...

Highly active cytochrome b6f complexes from spinach and the cyanobacterium Mastigocladus laminosus have been analyzed by liquid chromatography with electrospray ionization mass spectrometry (LCMS ). Both sizeexclusion and reverse-phase separations were used to separate protein subunits allowing measurement of their molecular masses to an accuracy exceeding 0.01% ( 3 Da at 30,000 Da). The produc...

The lipooligosaccharide (LOS) of immunotype L11 is unique within serogroup A meningococci. In order to resolve its molecular structure, we conducted LOS genotyping by PCR analysis of genes responsible for alpha-chain sugar addition (lgtA, -B, -C, -E, -H, and -F) and inner core substituents (lgtG, lpt-3, and lpt-6). For this study, we selected seven strains belonging to subgroup III, a major clo...