We present first principles molecular dynamics simulations of the equation of state of liquid deuterium up to eightfold compression and temperatures between 2000 and 20000 K. We report significant technical improvements over previous density functional calculations leading to excellent agreement with gas gun shock wave measurements, which have provided well established experimental data for the...

Low-velocity plate impact experiments using a single-stage gas-gun are performed on Zr58.5Cu15.6Ni12.8Al10.3Nb2.8. Compressive fracture surfaces of the samples subjected to varying impact velocities and stress amplitudes are evaluated in order to study their loading rate dependence. Samples impacted at increasing loading rates, from increasing velocities of impact, show a larger extent of local...

The improvement of a Balzers Eldigraph KD-G2 gas-phase electron diffractometer, previously operated at the University of Tübingen, is reported. The diffractometer was equipped with a state-ofthe-art telefocus electron gun, and high-energy radiation-sensitive imaging plates were introduced as detector system. A differential vacuum pumping system separating the diffraction chamber from the electr...

This paper presents a study on optimization of process parameters using particle swarm optimization to minimize angular distortion in 202 grade stainless steel gas tungsten arc welded plates. Angular distortion is a major problem and most pronounced among different types of distortion in butt welded plates. The process control parameters chosen for the study are welding gun angle, welding speed...

We present a phase retrieval method (PRM) for analyzing single-phase displacement interferometry measurements on rapidly changing velocity histories, including photon Doppler velocimetry (PDV). PRM identifies the peaks and valleys as well as zero-crossing points in a PDV time series, performs normalization and extracts point-by-point phase and thus velocity information. PRM does not require a w...

Three techniques of holographic Interferometry were developed to study the response of geological materials to propagating stress waves. Two of these techniques, stored-beam Interferometry and double-exposure Interferometry, were found effective when applied to studying smallamplitude wave propagation. The third technique, a form of time-average holographic Interferometry (which produces fringe...

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To know the infection status of zoonotic trematode metacercariae in brackish water fish, we surveyed mullets collected from 18 coastal areas in the Republic of Korea. The metacercariae of Pygidiopsis summa were detected in 236 (68.2%) out of 346 mullets examined. They were found in mullets from 15 areas except for those from Boseong-gun (Jeollanam-do), Pohang-si, and Uljin-gun (Gyeongsangbuk-do...

n engl j med 372;9 nejm.org february 26, 2015 875 dent Barack Obama’s promise in his 2013 State of the Union address to enact gun-control legislation was stymied, and the composition of the current Congress augurs ill for such federal legislation. Surveys show that a strong majority of Americans want better gun control, and the medical community is solidly behind them. So what stands in the way...

OBJECTIVES One way law enforcement officers support firearm safety is by promoting the use of gun locks. This investigation examined law enforcement officers' willingness to use gun locks on their own guns, as well as their opinions regarding gun locks in general. SETTING Law enforcement officers from an urban agency in the southern region of the United States. METHODS Free keyed cable gun ...