scholarly journals Internal oscillation frequencies and anharmonic effects for the double sine-Gordon kink

1989 ◽  
Vol 39 (7) ◽  
pp. 4500-4503 ◽  
Author(s):  
M. Salerno ◽  
M. R. Samuelsen
Keyword(s):  
Internal Oscillation ◽  
Anharmonic Effects ◽  
Oscillation Frequencies

The zona incerta modulates spontaneous spike-wave discharges in the rat

2013 ◽  
Vol 109 (10) ◽  
pp. 2505-2516 ◽  
Author(s):  
Fu-Zen Shaw ◽  
Yi-Fang Liao ◽  
Ruei-Feng Chen ◽  
Yu-Hsing Huang ◽  
Rick C. S. Lin
Keyword(s):  
Functional Role ◽  
Significant Inhibition ◽  
Zona Incerta ◽  
Obvious Effect ◽  
Spike Wave Discharges ◽  
Long Evans ◽  
Oscillation Frequencies ◽  
Spike Wave ◽  
Stimulation Of

The contribution of the zona incerta (ZI) of the thalamus on spike-wave discharges (SWDs) was investigated. Chronic recordings of bilateral cortices, bilateral vibrissa muscle, and unilateral ZI were performed in Long-Evans rats to examine the functional role of SWDs. Rhythmic ZI activity appeared at the beginning of SWD and was accompanied by higher-oscillation frequencies and larger spike magnitudes. Bilateral lidocaine injections into the mystacial pads led to a decreased oscillation frequency of SWDs, but the phenomenon of ZI-related spike magnitude enhancement was preserved. Moreover, 800-Hz ZI microstimulation terminates most of the SWDs and whisker twitching (WT; >80%). In contrast, 200-Hz ZI microstimulation selectively stops WTs but not SWDs. Stimulation of the thalamic ventroposteriomedial nucleus showed no obvious effect on terminating SWDs. A unilateral ZI lesion resulted in a significant reduction of 7- to 12-Hz power of both the ipsilateral cortical and contralateral vibrissae muscle activities during SWDs. Intraincertal microinfusion of muscimol showed a significant inhibition on SWDs. Our present data suggest that the ZI actively modulates the SWD magnitude and WT behavior.

Temperature-dependent anharmonic effects on shear deformability of Bi2Te3 semiconductor

2021 ◽  
Vol 202 ◽  
pp. 114016
Author(s):  
Ben Huang ◽  
Guodong Li ◽  
Bo Duan ◽  
Pengcheng Zhai ◽  
William A. Goddard
Keyword(s):  
Temperature Dependent ◽  
Anharmonic Effects

Anharmonic effects on theoretical IR line shapes of medium strong H(D) bonds

2009 ◽  
Vol 109 (3) ◽  
pp. 483-499 ◽  
Author(s):  
Noureddine Issaoui ◽  
Najeh Rekik ◽  
Brahim Oujia ◽  
Marek J. Wójcik
Keyword(s):  
Line Shapes ◽  
Anharmonic Effects

Raman study of anharmonic effects inPr0.5Ca0.5MnO3thin films

2003 ◽  
Vol 68 (2) ◽  
Author(s):  
A. Tatsi ◽  
E. L. Papadopoulou ◽  
D. Lampakis ◽  
E. Liarokapis ◽  
W. Prellier ◽  
...  
Keyword(s):  
Anharmonic Effects ◽  
Raman Study

Anharmonic effects at metal surfaces

1993 ◽  
Vol 64-65 ◽  
pp. 651-663 ◽  
Author(s):  
Talat S. Rahman ◽  
Zeng Ju Tian
Keyword(s):  
Metal Surfaces ◽  
Anharmonic Effects

scholarly journals Impact of anharmonic effects on the phase stability, thermal transport, and electronic properties of AlN

2016 ◽  
Vol 94 (10) ◽  
Author(s):  
Nina Shulumba ◽  
Zamaan Raza ◽  
Olle Hellman ◽  
Erik Janzén ◽  
Igor A. Abrikosov ◽  
...  
Keyword(s):  
Electronic Properties ◽  
Phase Stability ◽  
Thermal Transport ◽  
Anharmonic Effects

Testing and Analysis of an Oscillating Hydrofoils Turbine Concept

2010 ◽  
Author(s):  
Thomas Kinsey ◽  
Guy Dumas
Keyword(s):  
Water Flow ◽  
Spatial Configuration ◽  
Flow Simulation ◽  
Rotor Blades ◽  
Electric Generator ◽  
Power Extraction ◽  
Reduced Frequency ◽  
Custom Made ◽  
2D Flow ◽  
Oscillation Frequencies

A new concept of hydrokinetic turbine using oscillating hydrofoils to extract energy from water currents (tidal or gravitational) is presented, tested and analyzed in the present investigation. Due to its rectangular extraction plane, this technology is particularly well suited for river beds and shallow waters near the coasts. The present turbine is a 2 kW prototype, composed of two rectangular oscillating hydrofoils of aspect ratio 7 in a tandem spatial configuration. The pitching motion of each hydrofoil is coupled to their cyclic heaving motion through four-link mechanisms which effectively yield a one-degree-of-freedom system driving a speed-controlled electric generator. The turbine has been mounted on a custom-made pontoon boat and dragged on a lake at different velocities. Instantaneous extracted power has been measured and cycle-averaged for several water flow velocities and hydrofoil oscillation frequencies. Results are demonstrated to be self-consistent and validate our extensive 2D flow simulation database. The present data show optimal performances of the oscillating hydrofoils concept at a reduced frequency of about 0.12, at which condition the measured power extraction efficiency reaches 40% once the overall losses in the mechanical system are taken into account. Further measurements of power extraction with a single oscillating hydrofoil have also been performed by taking out the downstream hydrofoil of the tandem pair. Those measurements favorably compare, quantitatively, with available 3D CFD predictions. The 40% hydrodynamic efficiency of this first prototype exceeds expectation and reaches levels comparable to the best performances achievable with modern rotor-blades turbines. It thus demonstrates the promising potential of the oscillating hydrofoils technology to efficiently extract power from an incoming water flow.

Oscillatory Natural Convection of a Liquid Metal in Circular Cylinders

1994 ◽  
Vol 116 (3) ◽  
pp. 627-632 ◽  
Author(s):  
Y. Kamotani ◽  
F.-B. Weng ◽  
S. Ostrach ◽  
J. Platt
Keyword(s):  
Experimental Study ◽  
Natural Convection ◽  
Liquid Metal ◽  
Oscillatory Flow ◽  
Circular Cylinders ◽  
Flow Structures ◽  
Supercritical Flow ◽  
Aspect Ratios ◽  
Oscillation Frequencies ◽  
Rayleigh Numbers

An experimental study is made of natural convection oscillations in gallium melts enclosed by right circular cylinders with differentially heated end walls. Cases heated from below are examined for angles of inclination (φ) ranging from 0 deg (vertical) to 75 deg with aspect ratios Ar (height/diameter) of 2, 3, and 4. Temperature measurements are made along the circumference of the cylinder to detect the oscillations, from which the oscillatory flow structures are inferred. The critical Rayleigh numbers and oscillation frequencies are determined. For Ar=3 and φ = 0 deg, 30 deg the supercritical flow structures are discussed in detail.

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