scholarly journals A Novel Method for Measurement of Capacitances and Their Loss Factors

1995 ◽  
Vol 17 (4) ◽  
pp. 239-243
Author(s):  
Muhammad Taher Abuelma'atti ◽  
Hussain Abdullah Alzaher ◽  
Sami Saud Buhalim
Keyword(s):  
Theoretical Analysis ◽  
Simple Technique ◽  
Experimental Results ◽  
Sinusoidal Oscillator ◽  
Novel Method ◽  
Good Agreement ◽  
Loss Factors

A novel and simple technique for measurement of capacitances and their losses is presented. The method is based on a partially active-R sinusoidal oscillator. Experimental results are in good agreement with the theoretical analysis.

PHOTOINDUCED NONLINEAR OCTUPOLAR POLARIZATION: TRANSIENT AND PERMANENT REGIMES

1996 ◽  
Vol 05 (04) ◽  
pp. 653-670 ◽  
Author(s):  
CÉLINE FIORINI ◽  
JEAN-MICHEL NUNZI ◽  
FABRICE CHARRA ◽  
IFOR D.W. SAMUEL ◽  
JOSEPH ZYSS
Keyword(s):  
Theoretical Analysis ◽  
Second Harmonic ◽  
Experimental Results ◽  
Polar Field ◽  
Rotational Spectrum ◽  
Dual Frequency ◽  
One Dimensional ◽  
Ethyl Violet ◽  
Disperse Red 1 ◽  
Good Agreement

An original poling method using purely optical means and based on a dual-frequency interference process is presented. We show that the coherent superposition of two beams at fundamental and second-harmonic frequencies results in a polar field with an irreducible rotational spectrum containing both a vector and an octupolar component. This enables the method to be applied even to molecules without a permanent dipole such as octupolar molecules. After a theoretical analysis of the process, we describe different experiments aiming at light-induced noncentrosymmetry performed respectively on one-dimensional Disperse Red 1 and octupolar Ethyl Violet molecules. Macroscopic octupolar patterning of the induced order is demonstrated in both transient and permanent regimes. Experimental results show good agreement with theory.

The Separation of Light Gaseous Isotopes by Mass Diffusion Columns II

1964 ◽  
Vol 19 (6) ◽  
pp. 747-755
Author(s):  
W. J. De Wet ◽  
J. Los
Keyword(s):  
Theoretical Analysis ◽  
Mass Diffusion ◽  
Experimental Results ◽  
The Other ◽  
Countercurrent Flow ◽  
Gas Solubility ◽  
Flow Rates ◽  
Mixing Effects ◽  
Other Hand ◽  
Good Agreement

The design of mass diffusion columns operated with partition membranes, for the separation of light gaseous isotopes, is discussed. A theoretical analysis of experimental results obtained indicates that a good agreement between experimental results and theory is only obtained at low column pressures and moderate countercurrent flow rates. At fairly low countercurrent flow rates mixing effects due to viscous dragging and gas solubility by the condensate appear to be considerable whereas excessively high countercurrent flow rates, on the other hand, also seem undesirable. Some suggestions are proposed to obviate impairing effects at least to some extent.

Cumulative Fatigue Damage Under Stress-Controlled Conditions

1971 ◽  
Vol 93 (4) ◽  
pp. 691-698 ◽  
Author(s):  
Thang Bui Quoc ◽  
J. Dubuc ◽  
A. Bazergui ◽  
A. Biron
Keyword(s):  
Theoretical Analysis ◽  
Fatigue Damage ◽  
Experimental Results ◽  
Published Data ◽  
Mean Stress ◽  
Remaining Life ◽  
Random Loading ◽  
Controlled Conditions ◽  
Cumulative Fatigue Damage ◽  
Good Agreement

A theoretical analysis of uniaxial cumulative fatigue damage is presented together with a large number of experimental results on unnotched specimens of A-201 and A-517 steels. The theory developed permits the prediction of fatigue curves for stress-controlled conditions with zero or positive mean stress as well as the evaluation of the damage accumulated during a fatigue test and hence the prediction of the remaining life of a specimen. Theory is in good agreement with the experimental results as well as with published data on other materials. The development may be extended to other types of tests such as strain-controlled or random loading conditions.

A Microstrip Stepped-Impedance Resonator Bandpass Filter Based on Inductive Coupling

Frequenz ◽  
2019 ◽  
Vol 73 (1-2) ◽  
pp. 7-11
Author(s):  
X. C. Zhang ◽  
X. Chen ◽  
L. Sun ◽  
Y. S. Huang ◽  
X. F. Gao
Keyword(s):  
Theoretical Analysis ◽  
Bandpass Filter ◽  
Higher Order ◽  
Experimental Results ◽  
Inductive Coupling ◽  
Successful Design ◽  
Stepped Impedance Resonator ◽  
Good Agreement

Abstract A simple and successful design for a microstrip stepped-impedance resonator (SIR) bandpass filter (BPF) based on inductive coupling is presented. It is well known that SIRs are used to shift or suppress the higher order frequencies. In order to achieve compact circuit size, a perceptual stepped-impedance resonator is utilized. Based on theoretical analysis, this resonator can shift the spurious frequency to 3.8f0. The experimental results show good agreement with theory and simulations.

Effects of changing the M2+ cation on the crystal structure and optical properties of divalent samarium-doped MAl2Si2O8 (M = Ca, Sr, Ba)

RSC Advances ◽  
2015 ◽  
Vol 5 (25) ◽  
pp. 19734-19742 ◽  
Author(s):  
Ling Li ◽  
Xiaoguang Liu
Keyword(s):  
Crystal Structure ◽  
Optical Properties ◽  
Theoretical Analysis ◽  
Experimental Results ◽  
Photoluminescence Properties ◽  
Good Agreement

The photoluminescence properties and theoretical analysis of Sm2+ doped MAl2Si2O8 (M = Ca, Sr, Ba) were reported. The theoretical analysis is in good agreement with our experimental results.

scholarly journals Theoretical and Experimental Study of Split Semi Horse Shoe Structure

2018 ◽  
Vol 7 (5) ◽  
pp. 131-136
Author(s):  
G. Singh ◽  
S. S. Pattnaik
Keyword(s):  
Experimental Study ◽  
Theoretical Analysis ◽  
Equivalent Circuit ◽  
Radiation Pattern ◽  
Patch Antenna ◽  
Circuit Theory ◽  
Experimental Results ◽  
Effective Parameters ◽  
Metamaterial Structure ◽  
Good Agreement

In this paper a new planar metamaterial structure that looks like semi-horse shoe in shape (SSHSS) is designed and simulated. Theoretical analysis of proposed structure done using equivalent circuit theory. Medium effective parameters are extracted using modified NRW approach which proved the metamaterial property of the new unit cell. Radiation pattern, directivity and gain of the new structure were illustrated which gives the possibility of using SSHSS as the antenna. Proposed structure shows multiband characteristics. This antenna shows high directivity (7.92 dBi, 7.86 dBi, 10.11 dBi) and moderate gain (2.55 dBi, 3.90 dBi, 5.07 dBi) at 5.83 GHz, 8.41 GHz, 10.68 GHz respectively. RT duroid is used for fabrication of prototype of the proposed structure. This new structure can be used as metamaterial inspired antenna as well as normal patch antenna. Experimental results shows good agreement with simulated and theoretical results.The proposed structure has been simulated using IE3D electromagnetic simulator.

scholarly journals Output of MEMS Piezoelectric Energy Harvester of Double-Clamped Beams with Different Width Shapes

Materials ◽  
2020 ◽  
Vol 13 (10) ◽  
pp. 2330 ◽  
Author(s):  
Lei Jin ◽  
Shiqiao Gao ◽  
Xiyang Zhang ◽  
Qinghe Wu
Keyword(s):  
Theoretical Analysis ◽  
Energy Harvester ◽  
Experimental Results ◽  
Beam Shape ◽  
Microelectromechanical System ◽  
Micro Scale ◽  
Piezoelectric Energy ◽  
Clamped Beams ◽  
Different Shapes ◽  
Good Agreement

For a microelectromechanical system (MEMS) piezoelectric energy harvester consisting of double-clamped beams, the effects of both beam shape and electrode arrangement on the voltage outputs are analyzed. For two kinds of harvester structures including millimeter-scale and micro-scale, and different shapes including rectangular, segmentally trapezoidal and concave parabolic are taken into account. Corresponding electric outputs are calculated and tested. Their results are in good agreement with each other. The experimental results validate the theoretical analysis.

Comparison of theory and experiment in peristaltic transport

1971 ◽  
Vol 47 (1) ◽  
pp. 93-112 ◽  
Author(s):  
F. C. P. Yin ◽  
Y. C. Fung
Keyword(s):  
Theoretical Analysis ◽  
Sine Wave ◽  
Experimental Results ◽  
Peristaltic Transport ◽  
Finite Width ◽  
Difference Of Opinion ◽  
Flexible Wall ◽  
Definition Of ◽  
Theoretical Analyses ◽  
Good Agreement

Various theoretical aspects of peristaltic motion have attracted considerable attention in the recent literature. There also exists a difference of opinion concerning the definition of peristaltic reflux. Thus far, there has been no completely satisfactory experimental verification of any of the theoretical analyses. The present article describes some details of an experimental work which was carried out to verify the theoretical analysis of peristaltic transport in a two-dimensional channel with one fixed wall and one flexible wall on which a travelling sine wave is imposed. An approximate correction for finite width was introduced. Comparison of the theoretical and experimental results shows a good agreement and gives verification to the theoretical analysis. In the light of the experimental results, a discussion of the different definitions of peristaltic reflux is presented.

Experimental Investigation of the Biaxial Load-Extension Properties of Plain, Weft-Knitted Fabrics

1977 ◽  
Vol 47 (4) ◽  
pp. 233-239 ◽  
Author(s):  
Brian M. Macrory ◽  
J. Roger Mccraith ◽  
A. B. McNamara
Keyword(s):  
Experimental Investigation ◽  
Theoretical Analysis ◽  
Experimental Results ◽  
Knitted Fabric ◽  
Knitted Fabrics ◽  
Test Instrument ◽  
Biaxial Load ◽  
Theoretical Predictions ◽  
End Use ◽  
Good Agreement

A test instrument is described which permits measurement of load and extension along the courses and wales of a knitted fabric as the latter is being extended in both directions simultaneously. The rates of extension may be chosen to deform the fabric in a variety of modes representative of end-use situations. Experimental results obtained for plain, weft-knitted fabrics using three different hosiery yarns are presented. Comparison is made with values predicted by the authors' theoretical analysis of the biaxially-loaded fabric configuration, and good agreement between the experimental results and the theoretical predictions is obtained.

Determination of Non-Conservative Coupling Loss Factors Between Rotating Machinery Components

1991 ◽  
Author(s):  
J. M. Cuschieri ◽  
J. C. Sun ◽  
F. Journeau
Keyword(s):  
Experimental Results ◽  
Coupling Loss ◽  
Analysis Model ◽  
Impedance Function ◽  
Dissipation Term ◽  
Interface Characteristics ◽  
Film Interface ◽  
Good Agreement ◽  
Loss Factors

Abstract An expression for calculating the coupling loss factors between non-conservatively coupled substructures is derived based on the characteristics of the coupled substructures and the interface medium. The expressions consists of point mobility functions evaluated on the substructures near or at the junctions and a joint impedance function which represents the interface characteristics. The point mobility functions can be obtained analytically, for simple structures, or experimentally. The joint impedance is modeled by a dissipative stiffness element. The derived expressions for the coupling loss factors simplify to the well known expressions for conservative coupling when the dissipation term tends to zero. This approach is used to estimate the coupling loss factor between a shaft and a bearing liner with an oil film interface. The estimated results for the coupling loss factors are compared to experimental results obtained from a statistical energy analysis model. The estimated results and the experimental results show good agreement which verifies the approach used for the determination of the non-conservative coupling loss factors.

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