Measurement of ultrasonic phase and group velocities in human dental hard tissue
نویسندگان
چکیده
منابع مشابه
Measurement of ultrasonic phase and group velocities in human dental hard tissue
BACKGROUND The development of ultrasound for use in dental tissues is hampered by the complex, multilayered nature of the teeth. The purpose of this preliminary study was to obtain the phase and group velocities associated with several directions of ultrasonic wave propagation in relation to the tooth structure, which would then lead to the determination of the elastic constants in dental hard ...
متن کاملfaculty of psychology and social sciences group of anthropology master thesis in major of anthropology
چکیده پایان نامه (شامل خلاصه، اهداف، روش های اجرا و نتایج به دست آمده): کار جمع آوری گو یش های محلی در سال های اخیر شتاب امیدوار کننده ای به خود گرفته است. شاید از بارزترین اهداف جمع آوری گویش های مختلف، ثبت و ضبط آن، جلوگیری از نابودی و مهمتر از همه حل مشکلات دستوری زبان رسمی باشد. دقت در فرآیند های زبانی گویش های محلی نوع ارتباط مردم نواحی مختلف با پیرامون نشان را به ما نشان خواهد داد. از س...
Measurement of phase velocity dispersion curves and group velocities in a plate using leaky Lamb waves
The guided wave has been widely employed to characterize thin plates and layered media. The dispersion curves of phase and group velocities are essential for the quantitative application of guided waves. The technique using leaky Lamb wave (LLW) is one of the excellent methods to obtain dispersion curves. In the present work, a fully automated system for the measurement of LLW has been develope...
متن کاملPhase measurement of light absorption and scatter in human tissue
Analog and digital technologies are presented for precise measurement of propagation delay of photons from source and detector placed on portions of the human body. The goal of the apparatus design is to quantify absorption (ma) and scattering (ms8) induced by biological pigments and biological structures, respectively. Body tissues are highly scattering with a mean distance between scatterers ...
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ژورنال
عنوان ژورنال: Journal of Therapeutic Ultrasound
سال: 2013
ISSN: 2050-5736
DOI: 10.1186/2050-5736-1-5