scholarly journals Highly nonlinear pulse splitting and recombination in a two-dimensional granular network

2010 ◽  
Vol 82 (3) ◽  
Author(s):  
C. Daraio ◽  
D. Ngo ◽  
V. F. Nesterenko ◽  
F. Fraternali
Keyword(s):  
Two Dimensional ◽  
Highly Nonlinear ◽  
Pulse Splitting

scholarly journals Angular Dependence of Highly Nonlinear Pulse Splitting in a Two Dimensional Granular Network

2010 ◽  
Author(s):  
D. Ngo ◽  
F. Fraternali ◽  
C. Daraio
Keyword(s):  
Experimental Data ◽  
Stainless Steel ◽  
Numerical Simulations ◽  
Angular Dependence ◽  
Granular System ◽  
Two Dimensional ◽  
Highly Nonlinear ◽  
Solitary Pulse ◽  
First Time ◽  
Pulse Splitting

We investigate experimentally and numerically the propagation of highly nonlinear signals in a branched two-dimensional granular system composed by chains of uniform spherical beads. The system consists of a Y-shaped guide with various branch angles in which stainless steel spheres are arranged. We study the dynamic behavior of a solitary pulse crossing the bifurcated interface, and splitting between the two branches. We report for the first time the dependence of the split pulses’ speed on the branch angles. Numerical simulations based on Hertzian interaction between the particles are found in agreement with the experimental data.

Solid-particle motion in two-dimensional peristaltic flows

1976 ◽  
Vol 73 (1) ◽  
pp. 77-96 ◽  
Author(s):  
Tin-Kan Hung ◽  
Thomas D. Brown
Keyword(s):  
Reynolds Number ◽  
Solid Particle ◽  
Particle Motion ◽  
Particle Transport ◽  
Particle Displacement ◽  
Two Dimensional ◽  
Single Bolus ◽  
Highly Nonlinear ◽  
Neutrally Buoyant ◽  
Gap Width

Some insight into the mechanism of solid-particle transport by peristalsis is sought experimentally through a two-dimensional model study (§ 2). The peristaltic wave is characterized by a single bolus sweeping by the particle, resulting in oscillatory motion of the particle. Because of fluid-particle interaction and the significant curvature in the wall wave, the peristaltic flow is highly nonlinear and time dependent.For a neutrally buoyant particle propelled along the axis of the channel by a single bolus, the net particle displacement can be either positive or negative. The instantaneous force acting upon the particle and the resultant particle trajectory are sensitive to the Reynolds number of the flow (§ 3 and 4). The net forward movement of the particle increases slightly with the particle size but decreases rapidly as the gap width of the bolus increases. The combined dynamic effects of the gap width and Reynolds number on the particle displacement are studied (§ 5). Changes in both the amplitude and the form of the wave have significant effects on particle motion. A decrease in wave amplitude along with an increase in wave speed may lead to a net retrograde particle motion (§ 6). For a non-neutrally buoyant particle, the gravitational effects on particle transport are modelled according to the ratio of the Froude number to the Reynolds number. The interaction of the particle with the wall for this case is also explored (§ 7).When the centre of the particle is off the longitudinal axis, the particle will undergo rotation as well as translation. Lateral migration of the particle is found to occur in the curvilinear flow region of the bolus, leading to a reduction in the net longitudinal transport (§ 8). The interaction of the curvilinear flow field with the particle is further discussed through comparison of flow patterns around a particle with the corresponding cases without a particle (§ 9).

Two-Dimensional Piecewise Behavioral Model for Highly Nonlinear Dual-Band Transmitters

2017 ◽  
Vol 64 (11) ◽  
pp. 8666-8675 ◽  
Author(s):  
Mayada Younes ◽  
Andrew Kwan ◽  
Mohammadhassan Akbarpour ◽  
Mohamed Helaoui ◽  
Fadhel M. Ghannouchi
Keyword(s):  
Behavioral Model ◽  
Dual Band ◽  
Two Dimensional ◽  
Highly Nonlinear

scholarly journals Two-dimensional hybrid perovskites sustaining strong polariton interactions at room temperature

2019 ◽  
Vol 5 (5) ◽  
pp. eaav9967 ◽  
Author(s):  
A. Fieramosca ◽  
L. Polimeno ◽  
V. Ardizzone ◽  
L. De Marco ◽  
M. Pugliese ◽  
...  
Keyword(s):  
Quantum Wells ◽  
Degrees Of Freedom ◽  
Room Temperature ◽  
Optical Cavity ◽  
Oscillator Strengths ◽  
Layered Perovskite ◽  
Two Dimensional ◽  
Coherent Coupling ◽  
Highly Nonlinear ◽  
Order Of Magnitude

Polaritonic devices exploit the coherent coupling between excitonic and photonic degrees of freedom to perform highly nonlinear operations with low input powers. Most of the current results exploit excitons in epitaxially grown quantum wells and require low-temperature operation, while viable alternatives have yet to be found at room temperature. We show that large single-crystal flakes of two-dimensional layered perovskite are able to sustain strong polariton nonlinearities at room temperature without the need to be embedded in an optical cavity formed by highly reflecting mirrors. In particular, exciton-exciton interaction energies are shown to be spin dependent, remarkably similar to the ones known for inorganic quantum wells at cryogenic temperatures, and more than one order of magnitude larger than alternative room temperature polariton devices reported so far. Because of their easy fabrication, large dipolar oscillator strengths, and strong nonlinearities, these materials pave the way for realization of polariton devices at room temperature.

Non-Newtonian Creep Into a Two-Dimensional Cavity of Near-Rectangular Shape

1996 ◽  
Vol 63 (4) ◽  
pp. 1047-1051 ◽  
Author(s):  
A. Bogobowicz
Keyword(s):  
Steady State ◽  
Viscoelastic Medium ◽  
Analytic Solution ◽  
Minimum Principle ◽  
Viscous Medium ◽  
Two Dimensional ◽  
Rectangular Shape ◽  
Highly Nonlinear ◽  
Strain Formulation ◽  
Nonlinear Nature

The plane-strain formulation for the steady-state closure of a near-rectangular, single isolated opening in an indefinite viscoelastic medium is presented. A power creep law describes the creep behavior of the viscous medium. Because of the highly nonlinear nature of the creep, an analytic solution is not possible for the proposed opening geometry, hence an approximation method based upon the minimum principle for velocities is used. The analytic function is used to describe the shape of opening (circular, elliptical, and rectangular with rounded corners).

scholarly journals Proton acceleration by plasma wakefield driven by an intense proton beam

2013 ◽  
Vol 31 (3) ◽  
pp. 427-438 ◽  
Author(s):  
Longqing Yi ◽  
Baifei Shen ◽  
Liangliang Ji ◽  
Xiaomei Zhang ◽  
Wenpeng Wang ◽  
...  
Keyword(s):  
Proton Beam ◽  
Beam Propagation ◽  
Attractive Force ◽  
Two Dimensional ◽  
Long Distance ◽  
Additional Energy ◽  
Proton Acceleration ◽  
Highly Nonlinear ◽  
Plasma Wakefield ◽  
Proton Bunch

AbstractPlasma wakefield excited by a short TeV-scale proton beam is investigated in the highly nonlinear regime. Analysis of the “bubble” field illustrates that transverse expelling force of the wakefield can be compensated by the attractive force, which originates from the co-propagating electrons within the proton bunch, leading to a collimation effect that stabilizes the beam propagation. The protons located in the beam tail can be well-confined and accelerated forward for a long distance. Two-dimensional simulations show that after a 1-TeV proton bunch propagating through plasma for a distance, several percentages of the protons achieve a remarkable energy gain. This scheme presents a potential that proton beams from conventional accelerators may gain considerable additional energy through plasmas wakefields.

scholarly journals PROPAGATION OF HIGHLY NONLINEAR SIGNALS IN A TWO DIMENSIONAL NETWORK OF GRANULAR CHAINS

2008 ◽  
Author(s):  
C. Daraio ◽  
V. F. Nesterenko ◽  
Mark Elert ◽  
Michael D. Furnish ◽  
Ricky Chau ◽  
...  
Keyword(s):  
Two Dimensional ◽  
Dimensional Network ◽  
Granular Chains ◽  
Highly Nonlinear
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