In this study, the behavior of filament wound nanocomposite tubes under transverse impact loading is investigated. Experimental specimens were manufactured using Epon 828 resin with 0.5, 1.5 and 3 weight percentages of nano silica. Because of the varying nanosilica weight percentages in the specimens, different behaviors were observed; increasing the weight percentage of nanoparticles increased...

The temperatures induced in crystalline calcite (CaCO3) upon planar shock compression (95^160 GPa) are reported from two-stage light gas gun experiments. Temperatures of 3300^5400 K are obtained by fitting six-channel optical pyrometer radiances in the 450^900 nm range to the Planck gray-body radiation law. Thermodynamic calculations demonstrate that these temperatures are some 400^1350 K lower...

A novel compact time-resolved electron diffractometer has been built with the primary goal of studying the ultrafast molecular dynamics of photoexcited gas-phase molecules. Here, we discuss the design of the electron gun, which is triggered by a Ti:Sapphire laser, before detailing a series of calibration experiments relating to the electron-beam properties. As a further test of the apparatus, i...

Externally controlled diffuse discharge switches offer the potential of submicrosecond opening time and high repetition rate. For the investigation of an electron-beam controlled diffuse discharge, an e-beam gun was constructed which allows submicrosecond, multiple pulse operation. The 200 kV, 100 cm2, e-beam with thermionic cathode is designed as a triode. The control grid is pulsed to generat...

Introduction Modulating gene expression, either by transfection or by RNA interference (RNAi), is a powerful means for studying the functions of essential genes during nervous system development and maintenance. Both approaches depend on the successful delivery of the corresponding nucleic acids into the targeted cells. Current methods for introducing DNA and RNA into cells and tissues include ...

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...

In order to estimate the nutrient value of three dominant range species; Festucaovina, Trifolium montanum and Alopecurus textilis via proximate analyses and gas productiontechnique, samples were collected in three stages during grazing period from 26th May to 1thSeptember in six areas of Sabalan Mountain in North West of Iran. Results showed thatTrifolium montanum as a legume had higher values ...

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...