Results 211 to 220 of about 494 (239)

MnBi particles with high energy density made by spark erosion

Journal of Applied Physics, 2014
We report on the properties of low-temperature phase (LTP)-MnBi particles produced by the rapid-quenching technique of spark-erosion. The as-prepared powder consists of amorphous, crystalline, and superparamagnetic particles, mostly as porous aggregates. The major fraction of the powder consists of 20–30 nm particles.
Phi-Khanh Nguyen, Sungho Jin, Ami E. Berkowitz   +2 more
openaire   +1 more source

Investigation of carbon chemical erosion with increasing plasma flux and density

Nuclear Fusion, 2001
The possible reduction of the chemical erosion yield of carbon Ychem with increasing hydrogenic ion flux is a critical issue for the use of carbon based plasma facing materials in future high flux confinement devices. The PISCES linear plasma device is used to assess carbon Ychem through nearly an order of magnitude scan in flux (≤ 1023 s-1 m-2) and ...
D.G Whyte, G.R Tynan, R.P Doerner, J.N Brooks   +3 more
openaire   +1 more source

Shadow photometric method for measurements of electron density in erosion plasma

International Journal of Heat and Mass Transfer, 2013
Abstract The purpose of this work is property investigation of quasi-stationary plasma formations with high energy content for practical applications in high thermal physics and diagnostic of materials under extreme conditions. Investigated plasma formations are the result of two plasma counter-flows interaction process which is based on high-current
K. Alhussan, P.P. Khramtsov, O.G. Penyazkov, U.M. Hryshchanka, M. Yu. Chernik, V.A. Vasetskij, I.A. Shikh   +6 more
openaire   +1 more source

Erosion of a stable density gradient by sedimentation-driven convection

Nature, 1991
STABLE density gradients are common in the world's oceans and lakes, and play a crucial part in their physical, chemical and biological evolution. It has recently been suggested1 that turbidity currents provide an indirect mechanism for eroding this stratification.
openaire   +1 more source

Soil Erosion by Concentrated Flow: Shear Stress and Bulk Density

Transactions of the ASAE, 1994
Soil detachment by concentrated flow is often predicted using hydraulic shear stress (t) as a predictor variable. The nature of this relationship is uncertain, however, and may depend on many factors that influence soil resistance to detachment. Research was conducted to better understand the relationship between soil detachment from concentrated flow ...
null Y. T. Ghebreiyessus, null C. J. Gantzer, null E. E. Alberts, null R. W. Lentz   +3 more
openaire   +1 more source

Specimen diameter, impact velocity, erosion rate and particle density in a slurry pot erosion tester

Wear, 1993
Using the technique of measuring impact crater size, stagnation line impact velocities of glass spheres (mean diameter 666 μm) suspended in diesel oil at 40 °C on cylindrical copper erosion test specimens ranging in diameter from 3.2 mm to 9.5 mm tested at a nominal speed of 18.7 m s−1 in a slurry pot tester have been measured. Similarly, the variation
openaire   +1 more source

Numerical simulation of a low-density plasma erosion opening switch

The Physics of Fluids, 1986
Current conduction through a low density (∼1012 cm−3) collisionless plasma injected between two coaxial conducting cylinders is simulated using a 2 (1)/(2) -D, electromagnetic particle-in-cell code. Plasma is injected through the anode towards the cathode with flow velocity, VF, and is assumed to be azimuthally symmetric.
J. M. Grossmann, P. F. Ottinger, J. M. Neri, A. T. Drobot   +3 more
openaire   +1 more source

Effects of Particle Size and Bulk Density on Erosion of Quartz Particles

Journal of Hydraulic Engineering, 1998
Experiments have been done in order to determine the effects of particle size and bulk density on the erosion of quartz particles. Average particle sizes ranged from 5 to 1,350 μm, while bulk densities ranged from approximately 1.65 to 1.95 g/cm³. For the larger particles, the sediments behaved in a noncohesive manner, i.e., they consolidated rapidly ...
Jesse Roberts, Rich Jepsen, Doug Gotthard, Wilbert Lick   +3 more
openaire   +1 more source

Erosion of a sharp density interface by a turbulent jet at moderate Froude and Reynolds numbers

Journal of Fluid Mechanics, 2018
Using water–salt water laboratory experiments, we investigate the mechanism of erosion by a turbulent jet impinging onto a density interface, for moderate Reynolds and Froude numbers. The Froude number is defined by $Fr_{i}=u_{i}/\sqrt{b_{i}g^{\prime }}$, with $u_{i}$ and $b_{i}$, the typical velocity and width of the jet at the interface, and $g ...
Herault, J., Facchini, G., Le Bars, M.
openaire   +2 more sources

Effect of Applied Current Density on Cavitation-Erosion Characteristics for Anodized Al Alloy

Journal of Nanoscience and Nanotechnology, 2018
Surface finishing is as important as selection of material to achieve durability. Surface finishing is a process to provide surface with the desired performance and features by applying external forces such as thermal energy or stress. This study investigated the optimum supply current density for preventing from cavitation damages by applying to an ...
Seung-Jun, Lee, Seong-Jong, Kim
openaire   +2 more sources