purpose: to assess the agreement of ultrasonic pachymetry, the galilei dual scheimpflug analyzer and orbscan ii in measuring central corneal thickness (cct) in normal and keratoconic eyes. methods: in this prospective comparative study, cct was measured in 88 refractive surgery candidates and 76 (39 right) eyes of 45 keratoconic patients using ultrasonic pachymetry, galilei and orbscanii. readi...

flavonoids, are a large class of polyphenols, with more than 4000 combinations. they have an antioxidant role in plant photosynthesis and in the human body they optimally act as an antioxidant, anti-inflammatory, anticancer and protector of the heart. quercetin is in the flavonol group that is used to fight protection specifically against viruses and cancer cells. in this study, comparison of e...

Phased-array technology is being more and more adopted in the field of ultrasonic non destructive testing because of its enhanced flexibility over conventional monolithic probes. The most common abilities of steering, focusing and electronic scanning have been largely described; they allow faster inspection times or inspection of components with limited accessibility. Although these techniques ...

Multi-element ultrasonic transducer arrays open the possibility for rapid and flexible tomographic imaging systems. By electronic switching of the individual array elements, different schemes of reflection tomography and transmission tomography can be realized. This contribution firstly introduces general tomographic measurement principles to some detail. It then describes two multi-channel low...

An acoustic Luneburg lens is a symmetric gradient-index with refractive index decreasing radially from the center to outer surface. It can be used manipulate wave propagation allowing collimation and focusing capabilities. Previously studied lenses based on conventional concept work only at audible frequencies ranging up 15 kHz or single ultrasonic frequency of 40 kHz. In this paper, by tailori...

As a kind of nondestructive testing (NDT) method, shear-horizontal (SH)-guided wave detection technology is widely used on an electromagnetic acoustic transducer (EMAT). Although ultrasonic-guided waves perform well in defect location, it difficult to obtain detailed information about defects, and the low efficiency EMAT energy conversion still reduces EMAT’s performance. Therefore, this work, ...

Article history: Received on: 09/03/2013 Accepted on: 07/05/2013 Available online: 30/05/2013 Paris fargesii is a famous Chinese traditional medicinal plant used as antipyretic, antidotal, antiphlogistic and analgesic. This research aimed at the determination of the total polysaccharides contents in P. fargesii, which were collected from Baoxing country of Sichuan Province in order to get the o...

We have previously developed a novel ultrasonic method, namely, the phased tracking method, for accurately tracking the movement of the heart wall based on both the phase and magnitude of the demodulated signals to determine the instantaneous position of an object. With this method, it is possible to accurately detect small-amplitude velocity signals of less than a few micrometers of the heart ...

1310402-9595-IJET-IJENS © April 2013 IJENS I J E N S  Abstract— The purpose of this work is to present a methodology to ensure the metrological confidence during measurement of aerospace parts by ultrasonic, focusing the thickness measurement of an airplane wing skin. This methodology involves from the criteria used to perform the selection of a proper measurement system (ultrasonic) to the es...