The ultrasonic contact impedance technique and ultrasonic wave velocities have been widely used for non-destructive hardness measurement.Ultrasonic wave velocity shift provides through the thickness average hardness, however, the correlations are performed according to surface hardness. In order to accept ...
In order to solve this problem, two-point method and partition method, which are based on ultrasonic guided wave theory and grounding grid structure features, are proposed in this paper. Two-point method excites guided waves at two points firstly. Secondly, to establish two equations based on ...
Influence of ultrasound waves on varied processes of cotton fabric scouring The FTIR results from the work show that the significant changes in the cotton fiber structure depend of the ultrasound wave's high frequency, only, in the scouring process. It is beyond doubt that ultrasonic scouting trea...
All of them have one common feature – large areas to be tested and the complex geometry. The objective is to improve air-coupled and contact type testing techniques for excitation and reception of appropriate modes of ultrasonic guided waves in large and complex structures. Also, to develop ...
Effects of application of ultrasound waves in the shelf life of an amazon fruit: araá-boi The aim of this work was to evaluate the effects of ultrasonic treatments in quality of ara莽谩-boi fruits ( Eugenia stipitata McVaugh) during storage. Ara莽谩-boi fruits were processed at a constan...
Formation of Hydrogen Peroxide by Ultrasonic Waves: Free Radicals Biological effects of in vitro ultrasonic exposure may result from mechanical and from sonochemical mechanisms related to ultrasonic cavitation. Mechanical cell lysis by 1.61 MHz ultrasonic cavitation was assessed in a rotating tube expo.....
Ultrasonic Measurements In Brazilian Hardwood This paper reports on a study of the application of ultrasound waves in wood with the purpose of evaluating the latters mechanical properties. The evaluati... FGRD Oliveira,JAOD Campos,A Sales - 《Materials Research》 被引量: 100发表: 2002年 Reduction...
Influence of Ultrasonic Waves on the Processing of Cotton with Cationic Softener In recent years, the textile industry has been forced to develop new technologies to reduce energy and water consumption. The use of ultrasound in textile ... Mazeyar,Parvinzadeh,Naser,... - 《Journal of Surfactants...
Fig. 2. Method of application of ultrasound. 3.2. Ultrasonic water bath Ultrasonic water baths have been widely accepted methods for cleaning, and sanitation in the food and beverage processing operations. Ultrasonic waves produced by the equipment into the cleaning fluid render the food safe for ...
Ultrasound is composed of mechanical sound waves that originate from molecular movements that oscillate in a propagation medium. The waves have a very high frequency, equal to approximately 20 kHz, are divided into two categories (i.e., low-intensity and high-intensity waves) and cannot be perce...