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Earthquakes, a plucked string, ocean waves crashing on the beach, the sound waves that allow us to recognize known voices. Waves are everywhere, and the propagation and classical properties of these apparently disparate phenomena can be described by the same mathematical methods: variational calculus, characteristics theory, and caustics. Taking a medium-by-medium approach, Julian Davis explains the mathematics needed to understand wave propagation in inviscid and viscous fluids, elastic solids, viscoelastic solids, and thermoelastic media, including hyperbolic partial differential equations and characteristics theory, which makes possible geometric solutions to nonlinear wave problems. The result is a clear and unified treatment of wave propagation that makes a diverse body of mathematics accessible to engineers, physicists, and applied mathematicians engaged in research on elasticity, aerodynamics, and fluid mechanics. This book will particularly appeal to those working across specializations and those who seek the truly interdisciplinary understanding necessary to fully grasp waves and their behavior. By proceeding from concrete phenomena (e.g., the Doppler effect, the motion of sinusoidal waves, energy dissipation in viscous fluids, thermal stress) rather than abstract mathematical principles, Davis also creates a one-stop reference that will be prized by students of continuum mechanics and by mathematicians needing information on the physics of waves.

Mathematics --- Wave-motion, Theory of.

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In December 1921, France broadcast its first public radio program from a transmitter on the Eiffel Tower. In the decade that followed, radio evolved into a mass media capable of reaching millions. Crowds flocked to loudspeakers on city streets to listen to propaganda, children clustered around classroom radios, and families tuned in from their living rooms. Radio and the Politics of Sound in Interwar France, 1921-1939 examines the impact of this auditory culture on French society and politics, revealing how broadcasting became a new platform for political engagement, transforming the act of listening into an important, if highly contested, practice of citizenship. Rejecting models of broadcasting as the weapon of totalitarian regimes or a tool for forging democracy from above, the book offers a more nuanced picture of the politics of radio by uncovering competing interpretations of listening and diverse uses of broadcast sound that flourished between the world wars.

Sociology of cultural policy --- Mass communications --- anno 1930-1939 --- anno 1920-1929 --- France --- Radio broadcasting --- Sound --- Mass media --- Politics and culture --- Political aspects --- History --- Social aspects --- Politics and government --- Social life and customs --- Mass communication --- Media, Mass --- Media, The --- Communication --- Acoustics --- Continuum mechanics --- Mathematical physics --- Physics --- Pneumatics --- Radiation --- Wave-motion, Theory of --- Radio --- Radio industry and trade --- Broadcasting --- Freedom of information --- Government publicity --- 20th century --- 1914-1940