Abstract The aim of this study is to model the nature nonlinear torsional magnetohydrodynamic waves propagating in solar jets as they are elevated outer atmosphere. contribution sequential processes transfer energy taken under consideration: cascade and shock formation. Thus a straight magnetic cylinder embedded plasma with an initial field parallel flow axis implemented. To resemble jet where ...

A mechanism connecting the local untwisting and opening of DNA double helix is proposed. The presented thermodynamical approach is based on two models: the Peyrard-Bishop model that describes the denaturation of DNA due to thermal fluctuations and the model developed by the author describing solitary torsional waves, which propagate along the DNA molecule forced by advancing RNA polymerase. The...

Propagation of torsional waves along isothermal and initially-untwisted magneticflux tubes embedded in the solar atmosphere is studied analytically. Conditions for wave propagation along thin and wide magnetic-flux tubes are determined, and it is shown that the propagation along thin tubes is cutoff free; however, for wide tubes the propagation is affected by a cutoff frequency. A method to det...

A hybrid longitudinal-torsional ultrasonic transducer is designed and fabricated in this research. The design of the transducer was performed using the FE method with ABAQUS software, with the aim of combining the longitudinal and torsional vibration modes. The transducer horn is then fabricated using a 4-axis milling machine. The PZT stacks are employed in order to excite the transducer. The t...

We show that an all-fiber acousto-optic tunable filter based on polarization mode coupling using torsional acoustic wave is immune to the fiber bend and physical contact in the acousto-optic interaction region. We also propose and demonstrate a novel strain-free and size-reduced tunable filter with a 4-m-long fiber acousto-optic interaction region looped into a 5- cm-diameter coil.

A Semi-Analytical Finite Element (SAFE) method is developed to model accurately the propagation velocity and leakage of guided waves along an immersed waveguide with arbitrary non-circular cross-section. Thus an accurate inverse model is provided to measure the density of the fluid by measuring the change of the torsional wave speed. Experimental results obtained with a rectangular bar in a ran...

Noncommutative gravity in three dimensions with vanishing cosmological constant is examined. We find a solution which describes a spacetime in the presence of a torsional source. We estimate the phase shift for each partial wave of a scalar field in the spacetime by the Born approximation. PACS number(s): 04.60.Kz, 11.10.Kk, 11.80.Et, 11.80.Fv Typeset using REVTEX Email address: [email protected]...