Results 71 to 80 of about 73,121 (297)

A two-species continuum model for aeolian sand ripples [PDF]

, 1999
We formulate a continuum model for aeolian sand ripples consisting of two species of grains: a lower layer of relatively immobile clusters, with an upper layer of highly mobile grains moving on top.
A. Mehta, A. Mehta, A. Mehta, A. Mehta, Anita Mehta, H. M. Jaeger, H. M. Jaeger, H. Nishimori, H. Nishimori, H. Nishimori, J. Ungar, K. Pye, L. Prigozhin, N. B. Ouchi, P. Biswas, R. A. Bagnold, R. B. Hoyle, R. E. Hunter, R. Greeley, R. P. Sharp, R. S. Anderson, R. S. Anderson, R. S. Anderson, R. S. Anderson, Rebecca B. Hoyle, S. B. Forrest, S. F. Edwards, S. K. Lele, S. Mitha, W. Landry   +29 more
core   +2 more sources

Dynamic Testing of Cold Gas Sprayed Bipolar Plates–Porous Transport Layer Coating System in Proton Exchange Membrane Water Electrolysis

Advanced Engineering Materials, EarlyView.
Through direct application of porous transport layer (PTL) on the bipolar plate (BPP) with thermal spraying, the interfacial contact resistance is improved. With the cold gas sprayed BPP–PTL coating system, a proton exchange membrane water electrolysis cell with a cell voltage of Ucell = 1.9 V can be operated up to i = 2.5 A/cm2 in a dynamic mode ...
Kirsten Bobzin, Marvin Erck, Kevin Jasutyn, Katja Radermacher, Andreas Bund, Mario Kurniawan   +5 more
wiley   +1 more source

Calibration and test of contact parameters for alfalfa stalk at primary florescence based on discrete element method.

PLoS ONE
In view of the lack of accurate models for discrete element simulation in the current research and development process of forage harvesting and crushing machinery, the contact parameters were calibrated based on Hertz-Mindlin (no slip) contact model by ...
Tao Chen, Shujuan Yi, Yifei Li, Guixiang Tao, Xin Mao   +4 more
doaj   +1 more source

Competition and cooperation:aspects of dynamics in sandpiles

, 2005
In this article, we review some of our approaches to granular dynamics, now well known to consist of both fast and slow relaxational processes. In the first case, grains typically compete with each other, while in the second, they cooperate.
Anita Mehta, Bagnold R A, Berg J, Bernal J D, Bollobas B, Brown R L, Caballero G, Coniglio A, Doi M, Edwards S F, Edwards S F, Edwards S F, Fukushima E, G C Barker, J M Berg, J M Luck, Kurchan J, Liu C H, Luck J M, Luck J M, Luck J M, Luck J M Mehta A, Marinari E, Mehta A, Mehta A, Mehta A, Mehta A, Mehta A, Mehta A, Mézard M, Reynolds O, Smoluchowski M V   +31 more
core   +1 more source

Raman Spectroscopic Identification of Oxide Phases in a Corroded MgO–Steel Composite Anode Used in Aluminum Molten Salt Electrolysis

Advanced Engineering Materials, EarlyView.
Micro‐Raman spectroscopy is applied to characterize corrosion products in a recycled‐based MgO–316L steel composite anode after molten salt electrolysis. A depth‐dependent Fe–O/Fe–Al–O layer sequence of magnetite, hercynite, and an Al‐doped magnetite transition zone is identified.
Felix Drechsler, Serhii Yaroshevskyi, Alexander Adamczyk, Mahnaz Mehdizadehlima, Julia Richter, Cameliu Himcinschi, David Rafaja, Alexandros Charitos, Christos G. Aneziris, Jens Kortus   +9 more
wiley   +1 more source

Revolving rivers in sandpiles: from continuous to intermittent flows

, 2007
In a previous paper [Phys. Rev. Lett. 91, 014501 (2003)], the mechanism of "revolving rivers" for sandpile formation is reported: as a steady stream of dry sand is poured onto a horizontal surface, a pile forms which has a river of sand on one side owing
E. Altshuler, E. Martínez, J. Schmittbuhl, K. J. Måløy, O. Sotolongo-Costa, R. Toussaint, T. Takahashi   +6 more
core   +3 more sources

Surface Tension Measurement of Ti‐6Al‐4V by Falling Droplet Method in Oxygen‐Free Atmosphere

Advanced Engineering Materials, EarlyView.
In this article, the temperature‐dependent surface tension of free falling, oscillating Ti‐6Al‐4V droplets is investigated in both argon and monosilane doped, oxygen‐free atmosphere. Droplet temperature and oscillation are captured with one single high‐speed camera, and the surface tension is calculated with Rayleigh's formula.
Johannes May, Finn‐Lennard Janthur, Lena Kreie, Michael Müller, Sarah Seffer, Nick Schwarz, Jörg Hermsdorf, Thomas Hassel, Stefan Kaierle, Ludger Overmeyer   +9 more
wiley   +1 more source

Determination of the Dynamic Angle of Repose of Lunar Regolith Simulants

Geosciences
The determination of the dynamic angle of repose (DAR) of lunar regolith simulants is essential for modeling material behavior during in situ resource utilization (ISRU) processes and lunar surface operations.
Mateusz Pawłowski, Damian Pietrusiak, Jakub Wróbel, Janusz Kozubal   +3 more
doaj   +1 more source

Angle of repose experiments with snow: role of grain shape and cohesion

Journal of Glaciology, 2020
Snow appears as a granular material in most engineering applications. We examined the role of grain shape and cohesion in angle of repose experiments, which are a common means for the characterization of granular materials. The role of shape was examined
Carolin Willibald, Henning Löwe, Thiemo Theile, Jürg Dual, Martin Schneebeli   +4 more
doaj   +1 more source

Packing Fractions and Maximum Angles of Stability of Granular Materials

, 2004
In two-dimensional rotating drum experiments, we find two separate influences of the packing fraction of a granular heap on its stability. For a fixed grain shape, the stability increases with packing fraction.
D. Bideau, J. Duran, J. Luo, J. Olson, J. R. L. Allen, M. Priester, O. Reynolds, R. J. Zieve, R. L. Brown, S. Chopra   +9 more
core   +1 more source