3. Elementary processes in QED Scattering amplitudes and the differential cross-section Kinematics of binary processes, decay rate of an unstable particle The scattering e− e → μ− μ, the square of the scattering amplitude Unpolarized scattering and its differential cross-section The scattering e− μ− → e− μ−, the square of the scattering amplitude Crossing symmetry, Mandelstam variables, crossed...

Based on the excellent performance of shear metal dampers in building seismic capacity, traditional damper was optimized. A double-sided steel tube with simple structure, easy replacement, and wide application is proposed. In order to study influence different design parameters its performance, taking length, height, width, thickness, connection mode as variables, five groups 15 specimens were ...

An 8-bit programmable square finder cum frequency divider architecture is presented. This special architecture includes a high speed parallel counter, clock trigger circuit, eight bit multiplier logic, sequence termination logic and sequence restarter logic. The entire architecture is divided into two parts: The frequency divider section and the square finder section. The frequency divider circ...

This paper is concerned with the problem of the asymptotic stability of the characteristic modelbased golden-section control law for multi-input and multi-output linear systems. First, by choosing a set of polynomial matrices of the objective function of the generalized least-square control, we prove that the control law of the generalized least square can become the characteristic model-based ...

The behavior of the positron- 2 gamma annihilation rate on an atomic target near the positronium (Ps) formation threshold is determined. When the positron energy epsilon approaches the threshold epsilon(thr) from below, the effective number of electrons contributing to the annihilation, Z(eff), grows as Z(eff) approximately A/square root of [epsilon(thr)-epsilon], where A is related to the size...

An 8-bit programmable square finder cum frequency divider architecture is presented. This special architecture includes a high speed parallel counter, clock trigger circuit, eight bit multiplier logic, sequence termination logic and sequence restarter logic. The entire architecture is divided into two parts: The frequency divider section and the square finder section. The frequency divider circ...

This study compared the types of OFF bipolar cells found in the macaque retina with those found in the mouse retina and determined whether these OFF bipolar cells make direct contacts with both rods and cones by serial section transmission electron microscopy. We performed scatter plots and cluster analysis of the morphological variables of their axon terminals such as the stratification level,...

A semiempirical method for predicting the damping efficiency of hysteresis rods on-board small satellites is presented. It is based on the evaluation of dissipating energy variation of different ferromagnetic materials for two different rod shapes: thin film and circular cross-section rods, as a function of their elongation. Based on this formulation, an optimum design considering the size of h...