We sketch a derivation of abstract scattering theory from the microscopic rst principles deened by Bohmian mechanics. We emphasize the importance of the ux-across-surfaces theorem for the derivation, and of randomness in the impact parameter of the initial wave function|even for an, inevitably inadequate, orthodox derivation. 1 Dedicated to Joel Lebowitz, with love and admiration, for his 70th ...

The quantum mechanical transition between a free particle Lagrangian and the Klein Gordon field description of a free particle (particle wave duality) is conjectured to extend to an analogous construction of relativistically invariant wave equations associated with strings and branes, which we propose to call brane-wave duality. Electromagnetic interactions in the two systems are discussed. It ...

G Bm Bb Am D7 Intro: To lead a better life, I need my love to be here… G Am Bm C G Am Here, making each day of the year Bm C F#m B7 F#m B7 Em Am Am7 D7 Changing my life with a wave of her hand, nobody can, deny that there's something there. G Am Bm C G Am There, running my hands through her hair, Bm C F#m B7 F#m B7 Em Am Am7 D7/ Both of thinking how good it can be, someone is speaking, but she ...

The current research talks about a designed accelerometer system which is able to measure every type of mechanical vibration. The applied vibration in this survey is called seismic wave. Then the measured wave by this novel system is transf ormed to a specif ic function using spline interpolation. This explicit function can be used as a reference signal in the technique PWM to be made in curren...

/department of mechanical engineering Introduction Noise reduction is a key issue for High-tech and high precision instruments. To reduce the noise levels emitted by internal or external sources, porous materials can be used for acoustic shielding. The acoustic wave penetrates into the pore network, and part of its energy is dissipated as heat by viscous friction and thermal-elastic damping, ma...

The exact, well-posed, one-way reformulation of Helmholtz-type wave equations and the generalized Bremmer coupling series are applied to the two-way, scalar, multidimensional Helmholtz equation of mathematical physics. These two constructions provide complementary ways of incorporating one-way wave equation modeling into two-way wave propagation problems. The mathematical framework, for the exp...

Reflection and transmission of plane waves between two initially stressed thermoelastic half-spaces with orthotropic type of anisotropy is studied. Incidence of a SV-type wave from the lower half-space is considered and the amplitude ratios of the reflected and transmitted SV-wave, P-wave and thermal wave are obtained by using appropriate boundary conditions. Numerical computation for a particu...