Acoustic Fields And Waves In Solids Pdf Files
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The Application Gallery features COMSOL Multiphysics® tutorial and demo app files pertinent to the electrical, structural, acoustics, fluid, heat, and chemical disciplines. You can use these examples as a starting point for your own simulation work by downloading the tutorial model or demo app file and its accompanying instructions.
In the 1860's and 1870's, a Scottish scientist named James Clerk Maxwell developed a scientific theory to explain electromagnetic waves. He noticed that electrical fields and magnetic fields can couple together to form electromagnetic waves. He summarized this relationship between electricity and magnetism into what are now referred to as "Maxwell's Equations."
Surface acoustic waves (SAWs) are propagating strain waves that can be generated through oscillating electric fields at the surface of piezoelectric materials. SAWs have been used to induce magnetization oscillations in magnetic materials and to achieve assisted reversal of the magnetic moment13,14,15,16,17. However, SAW-induced magnetization dynamics is mostly treated as an effective variation in the magnetic energy, providing, thus, little information regarding the physical coupling between phononic and magnetization modes. In fact, delays between strain and magnetization dynamics were not considered. Resolving unequivocally the dynamic coupling between SAWs and magnetization requires resolving simultaneously strain and magnetization signals at the relevant time and space scales, which are picosecond and nanometer scales, respectively.
Ultrasonics broadly covers: Physics of Ultrasound - Acousto-optics; Ultrasonic visualization and imaging; Acousto-electric devices; SAW; Acoustic microscopy; Acoustic emission (ultrasonic domain); Physical aspects of ultrasonic wave propagation; Laser ultrasonics; Physical acoustics (solids, liquids and gases); Ultrasound scattering; Modelling of ultrasound waves; Air-coupled ultrasonics; Phononic crystals; Ultrasound in metamaterials and granular materials; Resonant ultrasound spectroscopy; Terahertz acoustics; Guided waves in surfaces and films; Ultrasound in composites; Ultrasonic flow imaging; Acoustic levitation and particle manipulation; Inverse problems in ultrasonics. Biomedical Ultrasound - Ultrasonic bio-effects; Ultrasonic characterization of biological media (bone, tissue, cartilage, etc.); Biomedical ultrasound imaging and signal processing; Vascular ultrasound; Ultrasound propagation in biological materials; Elastography; Biomedical ultrasonic instrumentation; Diagnostic, therapeutic and surgical ultrasound; HIFU; Ultrasonic contrast agents; Ultrasonic-guided drug delivery; Ultrasonic surgical devices; sonoporation and sonodynamics; Non-linear ultrasonics in biomedical applications. Ultrasonic NDT/SHM and Material Characterization - Ultrasonic NDT/NDE; Ultrasonics-based SHM and damage detection; Material characterization using ultrasound; Fatigue damage; Ultrasound phased arrays; Ultrasound in civil, aerospace and geological materials. Ultrasound in Industry and High-power Ultrasonics - Industrial applications of ultrasonics; Industrial processes utilizing high power ultrasonics such as welding, wire drawing, filtering, drilling, cutting, cleaning, emulsification, atomization; Process monitoring; Heat generation; Accelerated material characterization by ultrasonic fatigue testing; Ultrasonics in additive manufacturing; ultrasonic machining and manufacturing. Non-linear Ultrasonics - Non-linear ultrasound; Non-linear elastic waves in solids; Harmonic imaging; Acoustic nonlinearity; Sonoluminescence; Ultrasound cavitation and bubble dynamics; Ultrasonically produced streaming and radiation pressure; Ultrasonic fatigue. Ultrasonic Devices, Transducers and Systems - Ultrasound sensors, transducers and sensor networks; Ultrasound calibration; Instruments, devices and systems for ultrasound research and applications; Ultrasonic motors and actuators; Ultrasonics in control applications; Robotics and automated ultrasonic systems; Ultrasound-related smart materials and structures. Underwater Acoustics and Ultrasonics - Reflection, refraction, diffraction, interference, scattering and reverberation of waves under water; radiation from objects vibrating under water; Ultrasound microfluidics. Keywords: physical ultrasound; ultrasonic wave propagation; biomedical ultrasound; therapeutic ultrasound; ultrasound NDE/SHM; material characterization using ultrasound; ultrasound devices, transducers and systems; industrial applications of ultrasound; non-linear ultrasonics; bubble dynamics, laser ultrasonics; ultrasound in metamaterials; ultrasound imaging of biological materials; phononic crystals.
The Digital audio category encompasses formats used to encode recorded sound as machine readable files by converting acoustic sound waves into digital signals. Digital audio formats are generally composed of both a wrapper format, usually the common name associated with the file extension, and an encoding method or codec.
Ultrasonic is a branch of acoustics concerned with sound vibrations in frequency ranges above audible level. Ultrasound uses the transmission and reflection of acoustic energy. A pulse is propagated and its reflection is received, both by the transducer. For clinical purposes ultrasound is generated by transducers, which converts electrical energy into ultrasonic waves. This is usually achieved by magnetostriction or piezoelectricity. Primary effects of ultrasound are thermal, mechanical (cavitation and microstreaming), and chemical (sonochemicals). Knowledge of the basic and other secondary effects of ultrasound is essential for the development of techniques of application. 2b1af7f3a8