A super-resolution parameter estimation scheme for multi-dimensional nuclear magnetic resonance spectroscopy is presented in this paper. Multi-dimensional nuclear magnetic resonance signals can be modeled as the summation of multi-dimensional damped sinusoids. The frequencies and the damping factors of multi-dimensional damped sinusoids play important roles in protein structure determination us...

Plates, which geometric and physical parameters slightly differ from constant depend only on the radial coordinate, are analyzed. For free vibration frequencies of a plate, thickness and/or Young’s modulus coordinate asymptotic formulas obtained by means perturbation method. As examples, vibrations square plate with linearly or parabolically examined. The double plates similar edge support all ...

Energy harvesting is a conventional method to collect the dissipated energy of a system. In this paper, we investigate the optimal location of a piezoelectric element to harvest maximum power concerning different excitation frequencies of a vibrating cantilever beam. The cantilever beam oscillates by a concentrated sinusoidal tip force, and a piezoelectric patch is integrated on the beam to gen...

Transimpedance amplifiers using voltage feedback operational amplifiers are widely used for current to voltage conversion in applications when a moderatehigh bandwidth and a high sensitivity are required, such as photodiodes, photomultipliers, electron multipliers and capacitive sensors. The conventional circuit presents a virtual earth to the input and at low frequencies, the input capacitance...

A perturber may excite a coherent mode in a star cluster or galaxy. If the stellar system is stable, it is commonly assumed that such a mode will be strongly damped and therefore of little practical consequence other than redistributing momentum and energy deposited by the perturber. This paper demonstrates that this assumption is false; weakly damped modes exist and may persist long enough to ...

This study deals with tree-like structures that mimic a trunk with either first-order branches or both first and second-order branches of a sympodial tree. The corresponding mechanical model comprises physical pendula coupled with torsional springs and viscous dampers. Natural frequencies and modal shapes are obtained analytically and the effects of a branching angle and a stiffness ratio on th...