MONY
发表于 2025-3-25 06:41:08
,Generation of Ultrasound—Part I,resonances due to their limited extension. For this reason, principles of construction which have proven so successful in the audio range can be applied to the generation of ultrasound only to a very limited extent, if at all.
正式演说
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词汇表
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have a knowledge of general acoustics, introductory chapters survey the basic ideas and laws of acoustics without systematically deriving the formulae pre sented. Likewise, the third chapter, which deals with the radiation and diffraction of sound, is still fairly general, although it is somewhat more adapt978-94-011-3846-8
朝圣者
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Elsevier Science Publishers Ltd 1991
审问
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呼吸
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https://doi.org/10.1007/978-94-011-3846-8acoustics; calibration; diffraction; dynamics; electrons; heat; material; metals; microscopy; plastics; polyme
Graves’-disease
发表于 2025-3-26 08:22:43
Sound Radiation and Sound Diffraction,tion. An additional subject also covered in this chapter is the diffraction of sound by obstacles of finite size, a phenomenon which can be thought of as some kind of secondary radiation and hence closely related to sound radiation.
裂口
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Panther
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calamity
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Detection and Measurement of Ultrasound,In this chapter the detection and measurement of ultrasound with frequencies up to a few gigahertz will be described. For sound with still higher frequencies, i.e. for hypersound, specific methods have been developed which are not suited to lower frequencies. They will be discussed in Chapter VII.