Results 1 - 10 of 1060
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[en] High precision polystyrene equation of state data were measured using laser-driven shock waves with pressures from 180 GPa to 700 GPa. Alpha quartz was used as standard material, the shock wave trajectory in quartz and polystyrene was measured using the Velocity Interferometer for Any Reflector (VISAR). Instantaneous shock velocity in quartz and polystyrene was obtained when the shock wave pass the interface. This provided ∼1% precision in shock velocity measurements. (authors)
[en] By means of infrared spectroscopy method the influence of mechanical load on structure of polyvinyl alcohol films was considered in this article. The mechanical load rate was from 50 till 180 MPa and process duration was 1-240 hours.
[en] The construction of a chamber designed for neutron diffraction studies of the structure of solids under high gas pressures up to 0.5 GPa is described. This chamber is a modification of the chamber published earlier
[en] In the present study, the effect of back pressure on the filling fraction of dies during pure shear extrusion, a novel severe plastic deformation process, is investigated by finite element analysis. The applied load predicted by simulation during the pure shear extrusion process is verified and a good agreement between the predicted results at a Coulomb friction factor of 0.12 and experiments is found. Next, various amounts of back pressure are applied to a plunger at the exit channel of the dies, and their influence on the filling fraction of the die are studied. (author)
[en] After pretreatment of micronization for 60 mins, the nanostarches were obtained by high speed jet (HSJ) of one cycle at 240 Mpa. The nanostarches were also observed by morphological analysis. Moreover, the zeta potential of nanostarches (-17 mv) dramatically decreased compared with native (-4.90 mv), and the pasting properties of nanostarches significantly changed, indicating the disruption of the crystalline structures. The obtained nanostarches were related to the breakdown of starch molecules. This study will provide useful information of the nanostarches for its potential industrial application. (paper)
[en] This work reports the density data (315 points) of a series of amines consisting of pentylamine, hexylamine, and heptylamine at seven temperatures between (293.15 and 353.15) K, and pressures up to 140 MPa (every 10 MPa) which allows to study the influence of the chain length. A new Anton-Paar vibrating tube densimeter, calibrated with water and vacuum with an uncertainty of ±5 . 10-4 g . cm-3 was used to perform these measurements. The experimental density data were fitted with the Tait-like equation with low standard deviations. In addition, the isobaric thermal expansivity and the isothermal compressibility have been derived from this equation
[en] Complete text of publication follows. We have measured the Raman shift of InAsxP1-x (x=0.0, 0.4, 0.6, 0.8, 1.0) alloy films grown on InP substrates under hydrostatic pressures up to ∼90 kbar. Pressure blueshifts the phonon frequencies of InP-like and InAs-like modes for all the As compositions we tried. The shift rate of the LO phonon frequency of the InP-like mode increases with increasing x, which looks consistent with the known elastic properties of binary InP and InAs. Resonance effect is observed from x=0.7, x=0.75, and x=0.8 alloys when excited by 457.9 nm laser, which allows the measurement of shift rates of E1 band gap with pressure.
[en] A chessboard-like microstructured AZ91 alloy with multi-heterogenous structures was prepared via a combined processing method of high temperature ECAP and short-time aging. The ECAP-aged alloy exhibited superior mechanical properties with ultimate tensile strength of 406 MPa and elongation to failure of 17.9%.
[en] Freestanding single crystal nanowires of gold were fabricated from a single grain of pure gold leaf by standard lithographic techniques, with center section of 7 μm in length, 250 nm in width, and 100 nm in thickness. The ends remained anchored to a silicon substrate. The specimens were deflected via nanoindenter until plastic deformation was achieved. Nonlocalized and localized plastic deformations were observed. The resulting force-displacement curves were simulated using continuum single crystal plasticity. A set of material parameters which closely reproduce the experimental results suggests that the initial critical resolved shear stress was as high as 135 MPa