Frequency Dependent Interaction of Ultrasonic Waves with Surface-Breaking Cracks

1983 ◽  
pp. 203-212
Author(s):  
Dale W. Fitting ◽  
Laszlo Adler
Keyword(s):  
Ultrasonic Waves ◽  
Frequency Dependent ◽  
Dependent Interaction

Complex frequency-dependent interaction of class-I antiarrhythmic drugs as they affect intraventricular conduction

1995 ◽  
Vol 16 (6) ◽  
pp. 832-841 ◽  
Author(s):  
J.-K. LEE ◽  
C. TAKANAKA ◽  
M. NONOKAWA ◽  
H. KATO ◽  
S. YABE ◽  
...  
Keyword(s):  
Antiarrhythmic Drugs ◽  
Class I ◽  
Complex Frequency ◽  
Frequency Dependent ◽  
Intraventricular Conduction ◽  
Dependent Interaction

Ab initio calculation of the frequency-dependent interaction induced hyperpolarizability of Ar2

1999 ◽  
Vol 110 (6) ◽  
pp. 2872-2882 ◽  
Author(s):  
Berta Fernández ◽  
Christof Hättig ◽  
Henrik Koch ◽  
Antonio Rizzo
Keyword(s):  
Ab Initio ◽  
Ab Initio Calculation ◽  
Frequency Dependent ◽  
Dependent Interaction

scholarly journals Frequency-Dependent Sonochemical Processing of Silicon Surfaces in Tetrahydrofuran Studied by Surface Photovoltage Transients

Molecules ◽  
2021 ◽  
Vol 26 (12) ◽  
pp. 3756
Author(s):  
Artem Podolian ◽  
Andriy Nadtochiy ◽  
Oleg Korotchenkov ◽  
Viktor Schlosser
Keyword(s):  
Ultrasonic Transducer ◽  
Ultrasonic Waves ◽  
Silicon Surfaces ◽  
Surface Photovoltage ◽  
Ultrasonic Frequency ◽  
Solid Core ◽  
Frequency Dependent ◽  
Significant Difference ◽  
Transducer Design ◽  
P Type

The field of chemical and physical transformations induced by ultrasonic waves has shown steady progress during the past decades. There is a solid core of established results and some topics that are not thoroughly developed. The effect of varying ultrasonic frequency is among the most beneficial issues that require advances. In this work, the effect of sonication of Si wafers in tetrahydrofuran on the photovoltage performance was studied, with the specific goal of studying the influence of the varying frequency. The applied ultrasonic transducer design approach enables the construction of the transducer operating at about 400 kHz with a sufficient sonochemical efficiency. The measurements of the surface photovoltage (SPV) transients were performed on p-type Cz-Si(111) wafers. Sonication was done in tetrahydrofuran, methanol, and in their 3:1 mixture. When using tetrahydrofuran, the enhanced SPV signal (up to ≈80%) was observed due to increasing sonication frequency to 400 kHz. In turn, the signal was decreased down to ≈75% of the initial value when the frequency is lowered to 28 kHz. The addition of methanol suppressed this significant difference. It was implied that different decay processes with hydrogen decomposed from tetrahydrofuran could be attempted to explain the mechanism behind the observed frequency-dependent behavior.

Frequency-dependent interaction of ultrashort E-fields with nociceptor membranes and proteins

2010 ◽  
Vol 32 (2) ◽  
pp. 148-163 ◽  
Author(s):  
Nan Jiang ◽  
Brian Y. Cooper
Keyword(s):  
Frequency Dependent ◽  
Dependent Interaction

Ultrasonic characterization of the complex Young’s modulus of polymer parts fabricated with microstereolithography

2018 ◽  
Vol 24 (7) ◽  
pp. 1193-1202 ◽  
Author(s):  
Clinton B. Morris ◽  
John M. Cormack ◽  
Mark F. Hamilton ◽  
Michael R. Haberman ◽  
Carolyn C. Seepersad
Keyword(s):  
Dynamic Response ◽  
Young’S Modulus ◽  
Material Properties ◽  
Dynamic Modulus ◽  
Young's Modulus ◽  
Ultrasonic Waves ◽  
Frequency Dependent ◽  
Content Type ◽  
Material Parameters ◽  
Complex Young’S Modulus

Purpose Microstereolithography is capable of producing millimeter-scale polymer parts having micron-scale features. Material properties of the cured polymers can vary depending on build parameters such as exposure. Current techniques for determining the material properties of these polymers are limited to static measurements via micro/nanoindentation, leaving the dynamic response undetermined. The purpose of this paper is to demonstrate a method to measure the dynamic response of additively manufactured parts to infer the dynamic modulus of the material in the ultrasonic range. Design/methodology/approach Frequency-dependent material parameters, such as the complex Young’s modulus, have been determined for other relaxing materials by measuring the wave speed and attenuation of an ultrasonic pulse traveling through the materials. This work uses laser Doppler velocimetry to measure propagating ultrasonic waves in a solid cylindrical waveguide produced using microstereolithography to determine the frequency-dependent material parameters of the polymer. Because the ultrasonic wavelength is comparable with the part size, a model that accounts for both geometric and viscoelastic dispersive effects is used to determine the material properties using experimental data. Findings The dynamic modulus in the ultrasonic range of 0.4-1.3 MHz was determined for a microstereolithography part. Results were corroborated by using the same experimental method for an acrylic part with known properties and by evaluating the natural frequency and storage modulus of the same microstereolithography part with a shaker table experiment. Originality/value The paper demonstrates a method for determining the dynamic modulus of additively manufactured parts, including relatively small parts fabricated with microstereolithography.

"Escherichia coli-milk" Biofilm Removal from Stainless Steel Surfaces: Synergism between Ultrasonic Waves and Enzymes

Biofouling ◽  
2003 ◽  
Vol 19 (3) ◽  
pp. 159-168 ◽  
Author(s):  
Nadia Oulahal- Lagsir ◽  
Adele Martial- Gros ◽  
Marc Bonneauc ◽  
Loic Bluma
Keyword(s):  
Escherichia Coli ◽  
Stainless Steel ◽  
Ultrasonic Waves ◽  
Biofilm Removal ◽  
Steel Surfaces

" Escherichia coli -milk" Biofilm Removal from Stainless Steel Surfaces: Synergism between Ultrasonic Waves and Enzymes

Biofouling ◽  
2003 ◽  
Vol 19 (3) ◽  
pp. 159-168 ◽  
Author(s):  
NADIA OULAHAL-LAGSIR ◽  
ADELE MARTIAL-GROS ◽  
MARC BONNEAU ◽  
LOIC BLUM
Keyword(s):  
Escherichia Coli ◽  
Stainless Steel ◽  
Ultrasonic Waves ◽  
Biofilm Removal ◽  
Steel Surfaces
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