The relaxation dynamics of a weathercock free-to-rotate, in the presence uniform flow, as it aligns with flow direction, is investigated experimentally wind-tunnel. observed to conveniently follow damped harmonic oscillator behavior. At first order, frequency set by aerodynamic coefficients. We show that quasi static approach fails precisely describe and non-stationary corrections are required ...

Abstract In this work, a generalized framework of the post-quasistatic approximation in higher dimensional non-comoving coordinates is presented. We study evolution adiabatically radiating and dissipative fluid configuration post-quasi-static approximation. An iterative method for describing self-gravitating spheres developed purpose. Dissipation described by free-streaming radiation heat flux....

Consider a coil above a conducting plate. The interaction between the probe-coil and the plate is modeled by a quasi-static approximation of Maxwell’s equations: the eddy current model. The associated electromagnetic transmission boundary-value problem can be solved by the integral equations method. However, the discretization of integral operators gives dense, complex and ill-conditioned linea...

We present an analytical method for the calculation of shapes of Stark-broadened spectral lines in plasmas, applicable to hydrogen and hydrogen-like transitions (including Rydberg ones). The method is based on the recently suggested quasi-contiguous approximation of the static Stark line shapes [E. Stambulchik, and Y. Maron, J. Phys. B: At. Mol. Opt. Phys. 41, 095703 (2008)], while the dynamica...

The performance of carbon nanotube field-effect transistors is analyzed, using the nonequilibrium Green’s function formalism. The role of the inelastic electron-phonon interaction on the both on-current and gate delay time of these devices is studied. For the calculation of the gate delay time the quasi-static approximation is assumed. The results confirm experimental data of carbon nanotube tr...

Proper selection of a signal-to-noise ratio (SNR) threshold largely determines the tightness of an approximation to the frame error rate of a system over a quasi-static fading channel. We demonstrate that the expression for the optimal threshold value, which has been established for single-input single-output (SISO) channels, remains unchanged for the general case of multiple-input multiple-out...

Elastography is a new imaging modality where elastic tissue parameters related to the structural organization of normal and pathological tissues are imaged. Basic principles underlying the quasi-static elastography concept and principles are addressed. The rationale for elastographic imaging is reinforced using data on elastic properties of normal and abnormal soft tissues. The several orders o...

Introduction Jet pumps are static components that can be used in closed-loop, traveling wave thermoacoustic devices to suppress a time-averaged mass flux (Gedeon streaming) that can exist [2]. The minimization of convective heat transport caused by this mass flux is of vital importance due to the detrimental effect it has on the device’s efficiency. Jet pumps have an asymmetric shape, resulting...