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7 Days to a Positive Attitude
"You are today where your thoughts have brought you; you will be tomorrow where your thoughts take you." - James Allen This week, you can be on your way to a positive attitude. You can take charge of your destiny and start in the direction of your dreams. You can learn to successfully deal with any difficult times or negative people you may encounter. You can unlock enthusiasm, determination, and energy using the keys of an optimistic point of view: releasing the past, keeping the future in mind, and taking everything one day at a time. Day by day, this book addresses a different topic relating to issues you may face as you work to improve your mental outlook. Beginning with a "game plan" an...
Catalog of Copyright Entries. New Series
Part 1, Books, Group 1, v. 21 : Nos. 1 - 135 (Issued March, 1924 - April, 1925)
New Acoustics Based on Metamaterials
This book highlights the acoustical metamaterials’ capability to manipulate the direction of sound propagation in solids which in turn control the scattering, diffraction and refraction, the three basic mechanisms of sound propagation in solids. This gives rise to several novel theories and applications and hence the name new acoustics. As an introduction, the book mentions that symmetry of acoustic fields is the theoretical framework of acoustical metamaterials. This is then followed by describing that acoustical metamaterials began with locally resonant sonic materials which ushered in the concept of negative acoustic parameters such as mass density and bulk modulus. This complies with form invariance of the acoustic equation of motion which again exemplifies the symmetry property of acoustic fields.
