scholarly journals Vibrational World

2017 ◽  
pp. 4797-4798
Author(s):  
Albert Thomagjini
Keyword(s):  
Period Of Oscillation

Thinking that time and mass are correlated, like mass and energy are ( E =m*c^2 ). The period of oscillation of the simple oscillator, with a mass M andspring with coefficient k, is given by:T = 2*Pi*Sqrt(M/k); (1)orT ~ Sqrt(M); (2)

A dynamical method for the determination of Young's modulus by stretching

1928 ◽  
Vol 24 (2) ◽  
pp. 276-279
Author(s):  
C. F. Sharman
Keyword(s):  
Young’S Modulus ◽  
Elastic Constants ◽  
Young's Modulus ◽  
The Other ◽  
Static Deformation ◽  
Elastic Forces ◽  
Dynamical Method ◽  
Period Of Oscillation

There are two general methods of measuring the elastic constants of bodies; one involves a study of the static deformation produced by the appropriate kind of stress, and the other a measurement of the period of oscillation of a system of known inertia under the elastic forces.

scholarly journals Beating in the RHEED Intensity Oscillations during Surfactant Mediated GaAs Molecular Beam Epitaxy: Process Physics and Modeling

VLSI Design ◽  
1998 ◽  
Vol 6 (1-4) ◽  
pp. 405-408
Author(s):  
Vamsee K. Pamula ◽  
R. Venkat
Keyword(s):  
Molecular Beam ◽  
Flux Ratio ◽  
High Energy ◽  
Equation Model ◽  
High Energy Electron ◽  
Fixed Temperature ◽  
Mbe Growth ◽  
Molecular Beam Epitaxial ◽  
Monolayer Coverage ◽  
Period Of Oscillation

In a recent work, beating in the reflection high energy electron diffraction (RHEED) intensity oscillations were observed during molecular beam epitaxial (MBE) growth of GaAs with Sn as a surfactant. The strength of beating is found to be dependent on the Sn submonolayer coverage with strong beating observed for 0.4 monolayer coverage. For a fixed temperature and flux ratio (Ga to As), the period of oscillation decreases with increasing Sn coverage. In this work, we have developed a rate equation model of growth to investigate this phenomenon. In our model, the GaAs covered by the Sn is assumed to grow at a faster rate compared to the GaAs not covered by Sn. Assuming that the electron beams reflected from the Sn covered surface and the rest of the surface are incoherent, the results of the dependence of the RHEED oscillations on Sn submonolayer coverages for various Sn coverages were obtained and compared with experimental data and the agreement is good.

scholarly journals On the Relationship between the Pure Delay and the Natural Period of Oscillation

2016 ◽  
Vol 07 (06) ◽  
pp. 504-507
Author(s):  
Daniel Chuk ◽  
Gustavo Rodriguez Medina
Keyword(s):  
Natural Period ◽  
Pure Delay ◽  
The Relationship ◽  
Period Of Oscillation

LEARNING IN RECURRENT FINITE DIFFERENCE NETWORKS

1995 ◽  
Vol 06 (03) ◽  
pp. 249-256 ◽  
Author(s):  
FU-SHENG TSUNG ◽  
GARRISON W. COTTRELL
Keyword(s):  
Finite Difference ◽  
Time Delays ◽  
Learning Algorithm ◽  
Time Constants ◽  
Learning Time ◽  
Discrete Algorithms ◽  
Finite Difference Discretization ◽  
Difference Discretization ◽  
Discrete Networks ◽  
Period Of Oscillation

A recurrent learning algorithm based on a finite difference discretization of continuous equations for neural networks is derived. This algorithm has the simplicity of discrete algorithms while retaining some essential characteristics of the continuous equations. In discrete networks learning smooth oscillations is difficult if the period of oscillation is too large. The network either grossly distorts the waveforms or is unable to learn at all. We show how the finite difference formulation can explain and overcome this problem. Formulas for learning time constants and time delays in this framework are also presented.

The Effect of Magnetic Field Strength on the Oscillatory Characteristics of Multimode Magnetoconvection

1993 ◽  
Vol 10 (4) ◽  
pp. 275-277
Author(s):  
J.O. Murphy ◽  
J.M. Lopez ◽  
C.P. Dyt
Keyword(s):  
Magnetic Field ◽  
Field Strength ◽  
Magnetic Field Strength ◽  
The Relationship ◽  
The Magnetic Field ◽  
Period Of Oscillation

AbstractThe effect of varying magnetic field strength on the frequency of oscillatory motions for cellular multimode magnetoconvection has been investigated. In addition the influence of the thermal, viscous and magnetic diffusivities have been taken into account and the range of preferred horizontal scales established. The relationship between the period of oscillation and the magnetic field strength is determined.

Quantum-well states and the short period of oscillation in Cu/Co(001) multilayers

1996 ◽  
Vol 54 (23) ◽  
pp. 17123-17127 ◽  
Author(s):  
D-J. Huang ◽  
P. D. Johnson ◽  
X. Shi
Keyword(s):  
Quantum Well ◽  
Short Period ◽  
Quantum Well States ◽  
Period Of Oscillation

Co/Cu INTERFACE ELECTRONIC STRUCTURES STUDY FROM FIRST-PRINCIPLES

2006 ◽  
Vol 20 (25n27) ◽  
pp. 3623-3628 ◽  
Author(s):  
JIAXIANG SHANG ◽  
XIAODAN ZHAO ◽  
YUE ZHANG ◽  
HUIBIN XU
Keyword(s):  
Fermi Surface ◽  
First Principles ◽  
Electronic Structures ◽  
Giant Magnetoresistance ◽  
Local Spin Density Approximation ◽  
Spin States ◽  
Magnetic Resistance ◽  
Good Agreement ◽  
Majority Spin ◽  
Period Of Oscillation

The electronic structures of Co/Cu interface have been calculated by first-principles method based on local spin density approximation. Models 3 Co/xCu ( x =1-8 monolayers) with different Cu layer thickness are investigated. The results show that the oscillation of the density of states near the Fermi surface with the Cu spacer thickness has been observed and the period of oscillation is about 6 atom layers, which has a good agreement with the corresponding experiments. We also discuss the spin polarization and magnetic resistance with the change of Cu layers thickness. Further analysis shows majority spin states near the Fermi surface played a key role in giant magnetoresistance (GMR).

PVT Measurements on 4′-n-Octyl-Biphenyl-4-Carbonitrile (8CB) up to 300 MPa

1998 ◽  
Vol 53 (9) ◽  
pp. 787-792
Author(s):  
M. Sandmann ◽  
A. Würflinger
Keyword(s):  
Volume Change ◽  
Atmospheric Pressure ◽  
Volume Changes ◽  
First Order ◽  
Smectic A ◽  
Enthalpy Changes ◽  
Second Order Transition ◽  
Clearing Temperature ◽  
Pvt Measurements ◽  
Period Of Oscillation

Abstract P, Vm , Tdata have been measured for the smectic, nematic and isotropic phases of 4'-n-octyl-biphen-yl-4-carbonitrile (8CB) in the temperature range 300-370 K and pressures up to 300 MPa. At atmospheric pressure all phase transitions appear to be of first order due to a discontinuity in the density. The volume change at the smectic A -nematic transition is only a tenth of the volume change at the clearing temperature. At moderate pressures below 80 MPa the SA -N transition could be detected as a discontinuity in the period of oscillation in measurements with a high-pressure vibrating tube densimeter. At higher pressures the discontinuity seems to die away, possibly indicating a change from first order to second order transition. From the volume changes and the slopes of the transition lines we calculate the enthalpy changes at the phase transition. The p, Vm , T data enable us to calculate the volume part of the entropy and the molecular field parameter γ=δln TNI/δln VNI .

Anodic behavior of silver in alkaline solutions

1969 ◽  
Vol 47 (22) ◽  
pp. 4253-4266 ◽  
Author(s):  
M. J. Dignam ◽  
H. M. Barrett ◽  
G. D. Nagy
Keyword(s):  
Film Thickness ◽  
The Other ◽  
Alkaline Solutions ◽  
Precipitation Process ◽  
Anodic Behavior ◽  
Silver Electrodes ◽  
Galvanostatic Conditions ◽  
Highly Porous ◽  
Silver Metal ◽  
Period Of Oscillation

Data, covering a range of pH and temperature, were obtained for the anodic oxidation of electropolished silver and the results compared with electrodes which had undergone repeated oxidation and reduction cycles. The behavior of the electrode is, in the main, complex, showing, for example, autopotential cycling under certain galvanostatic conditions (∼3 μA/cm2, 25 °C, 0.7 N NaOH), the period of oscillation being about [Formula: see text]. Several other hitherto unreported phenomena were also observed. The main conclusions reached are (i) that 2 different mechanisms are involved in the anodic formation of Ag2O on silver electrodes in basic electrolytes resulting in 2 types of film, 1 mechanism involves a dissolution–precipitation process, the other possibly a direct interfacial reaction; (ii) that the reduction of anodically formed Ag2O films either electrochemically or in hydrogen at 800 °C leaves behind a highly porous layer of silver metal; and (iii) that the limiting Ag2O film thickness is probably determined by a diffusion process occurring within the film.

scholarly journals FENDER SELECTION CRITERIA

1988 ◽  
Vol 1 (21) ◽  
pp. 220
Author(s):  
F. Vasco Costa
Keyword(s):  
Selection Criteria ◽  
Natural Period ◽  
Loading And Unloading ◽  
Period Of Oscillation

Fenders are to be selected taking into account two quite distinct functions they have to fulfill: - During berthing manoeuvres fenders have to avoid damage to the ship and to the berthing structure; - After ships are already berthed and moored, fenders have to keep them quiet during loading and unloading operations. To fulfill the first function fenders have to be able, while deflecing, to absorb a very large amount of energy. To fulfill the second function fenders need to be able, while recovering their form, to dissipate a large amount of energy. Besides, they have to contribute to reduce or to increase the natural period of oscillation of already moored ships, depending on their tendency to oscillate in phase or out of phase with waves reaching the berths.

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