Results 41 to 50 of about 75,364 (297)

The Origin of a Repose Angle: Kinetics of Rearrangements for Granular Materials

, 2001
A microstructural theory of dense granular materials is presented, based on two main ideas. Firstly, that macroscopic shear results form activated local rearrangements at a mesoscopic scale. Secondly, that the update frequency of microscopic processes is
Anaël Lemaître, D. Ertaş, F. Chevoir, F. Radjai, J.-Ph. Bouchaud, J. T. Jenkins, M. L. Falk, R. A. Bagnold, S. B. Savage   +8 more
core   +1 more source

Structure–Function Decoupling of the Sensorimotor and Default Mode Networks in Black Americans With MS

Annals of Clinical and Translational Neurology, EarlyView.
ABSTRACT Background and Objectives Multiple sclerosis (MS) exhibits racially disparate rates of disease progression. Black people with MS (B‐PwMS) experience a more severe disease course than non‐Hispanic White people with MS (NHW‐PwMS). Here we investigated structural and functional connectivity as well as structure–function decoupling in the ...
Emilio Cipriano, Giacomo Boffa, Maria Petracca, Marta Ponzano, Nicole Graziano, Claire Wigley, Claire Riley, Jonathan Howard, Pietro Bontempi, Sylvia Klineova, Fred Lublin, Matilde Inglese   +11 more
wiley   +1 more source

Parameter Calibration for Simulation of Gentiana Seedling Substrate Based on Discrete Element Method

BioResources, 2023
The physical and mechanical parameters of the rotten rice straw (RRS), rice husk biochar (RHB), and the mixture of the two materials (the substrate) were calibrated by Plackett-Burman and Box-Behnken experiments to obtain the parameters for simulation of
Hongguang Cui, Tian Li, Tianyou Chen, Liyan Wu, Hongbo Li, Cuihong Liu, Mingjin Xin, Yuqiu Song   +7 more
doaj   +2 more sources

Calibration and Verification of Discrete Element Parameters of Surface Soil in Camellia Oleifera Forest

Agronomy
To analyze the interaction between the surface soil and the soil-contacting component (65 Mn) in the camellia oleifera forest planting area in Changsha City, Hunan, China, in this study, we conducted discrete element calibration using physical and ...
Xueting Ma, Yong You, Deqiu Yang, Decheng Wang, Yunting Hui, Daoyi Li, Haihua Wu   +6 more
doaj   +1 more source

On the Shape of the Tail of a Two Dimensional Sand Pile

, 1996
We study the shape of the tail of a heap of granular material. A simple theoretical argument shows that the tail adds a logarithmic correction to the slope given by the angle of repose. This expression is in good agreement with experiments.
A. Károlyi, D. Désirable, G. H. Ristow, G. W. Baxter, H. J. Herrmann, H. J. Herrmann, H. M. Jaeger, I. Goldhirsch, J. J. Alonso   +8 more
core   +1 more source

Current Tracking Adaptive Control of Brushless DC Motors

International Journal of Adaptive Control and Signal Processing, EarlyView.
In this paper, the current tracking for Brushless Direct Current motors is approached considering uncertainty in the parameters of the motor's model. An adaptive control scheme to compensate electrical parameters uncertainty is proposed without requiring any knowledge of the mechanical parameters.
Fernanda Ramos‐García, Axel Coronado‐Andrade, Gerardo Espinosa‐Pérez, Luis Alvarez‐Icaza   +3 more
wiley   +1 more source

Determination of melon seed physical parameters and calibration of discrete element simulation parameters.

PLoS ONE
To improve the accuracy of the Hami melon discrete element model, the parameters of the Hami melon seed discrete element model were calibrated by combining practical experiments and simulation tests. The basic physical parameters of Hami melon seeds were
Yuan Wan, Bowen Zhang, Qinghui Lai, Yan Gong, Yu Qingxu, Xiao Chen   +5 more
doaj   +1 more source

Bistable Mechanisms 3D Printing for Mechanically Programmable Vibration Control

Advanced Engineering Materials, EarlyView.
This work introduces a 3D‐printed bistable mechanism integrated into tuned mass dampers (TMDs) for mechanically adaptive passive vibration suppression. Through optimized geometry, the bistable design provides adaptable vibration reduction across a broad range of scenarios, achieving effective vibration mitigation without complex controls or external ...
Ali Zolfagharian, Frédéric Demoly, Mohammad Lakhi, Bernard Rolfe, Mahdi Bodaghi   +4 more
wiley   +1 more source

Tailoring the frictional properties of granular media

, 2011
A method of modifying the roughness of soda-lime glass spheres is presented, with the purpose of tuning inter-particle friction. The effect of chemical etching on the surface topography and the bulk frictional properties of grains is systematically ...
C. A. Coulomb, Cornelius Fischer, I. N. Bronstein, I. Rodríguez Iturbe, Markus Benderoth, Matthias Schröter, P. Meakin, Philipp Aurin, Sonia Utermann   +8 more
core   +1 more source

Adaptable Tile‐Based Pneumatic Origami through Structurally Coupled Localized Actuation

Advanced Engineering Materials, EarlyView.
This article presents tile‐based pneumatic origami structures with rigid tiles and flexible fabric creases, achieving adaptable properties including morphing shape, selective multistability, and tunable stiffness. Independently pressurized folding bladders at each crease enable structurally coupled localized actuation of origami structures.
Tiantian Li, Jonathan Luntz, Diann Brei
wiley   +1 more source