Because of the need of rapid detection of internal defects and embedded object in concrete structures, a ultrasonic detecting method with linear array transducers is presented here, which is the high-resolution and efficient imaging technique for concrete materials by combining with synthetic aperture focusing technique (SAFT). At first, simulation data of array detection are processed to be am...

The n o n l i n e a r i t y p a r a m e t e r B / A h a s b e e n d e t e r m i n e d f o r t i s s u e mode l s ( a q u e o u s s o l u t i o n s o f b i o l o g i c a l m a c r o m o l e c u l e s ) a n d f o r e x c i s e d t i s s u e s f r o m measuremen t s o f t h e f u n d a m e n t a l p r e s s u r e a m p l i t u d e , a t t h e s o u r c e , and t h e s e c o n d ha rmon ic p r e s ...

It is _known _that internal stress concentrations can give rise to microcracks which then grow when the str~cture 1s subJected to external forces. It has also been found that the velocity'of sound is altered as ~t propagates through a region of stress. In this paper we discuss a technique called ComputerAsslsted Tomography (~AT) and describe ~n application that provides pictures of stress field...

Government agencies and homeland security related organizations have identified the need to develop and establish a wide range of unprecedented capabilities for providing scientific and technical forensic services to investigations involving hazardous chemical, biological, and radiological materials, including extremely dangerous chemical and biological warfare agents. Pacific Northwest Nationa...

The overall objective of this work was to demonstrate feasibility of adaptive nonlinear signal processing techniques applied to characterization of ultrasonic nondestructive testing (UNDT) waveforms for accurate inferences of flat -bottom hole sizes. The classified waveforms were ultrasonic pulse echoes obtained from two different sets of 7075-T6 aluminum area-amplitude test blocks and three di...

AIM This in vitro study aimed to compare the time required for removal, the presence of residues of restorative material, tooth structure loss and dental surface morphology after removal of composite resin and amalgam restorations from occlusal cavities in primary molars using conventional high-speed bur and CVDentus® ultrasonic diamond tips. MATERIALS AND METHODS A total of 37 primary molars...

Manufacturing processes and product development for industrial medical applications are submitted to rigorous quality control. Quality assurance may provide accuracy of the physical quantities concerned guarantee that defects do not arise when is developed. Quantities, such as temperature distribution play a significant role must be monitored prevent material damage. However, number techniques ...

Ultrasonic additive manufacturing (UAM), a solid-state technology, was invented in 1999 by Dawn White [...]