GRB 211211A was accompanied by a kilonova, implying merger origin for the event. A precursor flare, modulated quasi-periodic oscillations at $\approx 22\, \mbox{Hz}$, also seen 1\, \mbox{s}$ prior to main emission. It is suggested here that resulted from resonant shattering of one star's crust coalescence. Seismic aftershocks and low-frequency torsional modes may emanate rupture site in this ca...

Watts [1] in 1883 and Frahm [2] in 1909 reported on the first use of a dynamic vibration absorber. The range of industrial applications of such device is wide and includes the minimization of the rolling of ships, the damping of torsional vibration of internal combustion engines and the smoothing of vibrations in a barber cutter. The minimization of oscillations of tall buildings by means of dy...

The tissues of the body are routinely subjected to various forms of mechanical vibration, the frequency, amplitude, and duration of which can contribute both positively and negatively to human health. The vocal cords, which are in close proximity to the thyroid, may also supply the thyroid with important mechanical signals that modulate hormone production via mechanical vibrations from phonatio...

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...

The article presents the analysis results of changes in operability silicone dampers torsional vibrations marine diesel engines on basis practical measurements carried out by Testing Center Marine Technology Service under Astrakhan State Technical University (TC MTS). TC MTS is accredited Russian classification society - Maritime Register Shipping (RMRS) field calculation and measurement vibrat...

Monomers of azobenzene were isolated in argon matrices at 15 K and characterized by infrared spectroscopy and theoretical calculations. When the equilibrium vapors existing over the azobenzene crystals at room temperature were trapped in the matrix, only the thermodynamically most stable E-azobenzene was detected. In an attempt to convert E-azobenzene into the Z isomer, the matrix-isolated E-mo...

This paper proposes a model-based two-degree-of-freedom (2DOF) speed control for medium voltage (MV) variable drive (VSD) connected to centrifugal compressor (CC) train. Torsional mode excitations in the shaft due converter switching behaviour are considered. An effective description of harmonics transfer is proposed. The tuning strategy aims optimize tracking step and ramp command, taking care...