Preface to the Second Edition
A person is indeed fortunate if he or she is able to devote an entire professional life to a field that is always interesting, challenging, and enjoyable. I have had this privilege. During the past 40 years, I have participated in more than 925 research studies in ultrasonics. The study of ultrasonics is interesting because it is applied in so many different fields of science and industry. In ultrasonic research, there is a need to learn something about each of the fields in which it is applied. Research helps to satisfy the innate curiosity of humankind. My curiosity certainly has been stimulated by ultrasonic research in diverse fields such as materials forming, metallurgy, medicine, agriculture, chemistry, electronics ...
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