The motion of a particle evaluated from the noninertial frame rotating Earth with constant angular velocity ω is solved analytically without carrying out priori approximations, that is, considering both Coriolis and centrifugal terms. Position vector solutions written in terms generic initial conditions were obtained decoupled sixth-order equation motion, using fully vectorial approach, specifi...

Ultrasound vibro-acoustography is a novel medical imaging modality that combines the high resolution of high-frequency ultrasound with the speckle-free images obtained using lowfrequency methods. This imaging modality relies on the nonlinear interaction of two high frequency beams at slightly different frequencies. We describe the physics of ultrasound vibroacoustography and outline a strategy ...

In this paper, vibration analysis of rotary tapered axially functionally graded (AFG) Timoshenko nanobeam is investigated in a thermal environment based on nonlocal theory. The governing equations of motion and the related boundary conditions are derived by means of Hamilton’s principle based on the first order shear deformation theory of beams. The solution method is considered using generaliz...

Like the Earth, a neutron star (NS) can undergo torque-free precession because some piece ∆Id of its inertia tensor remains tied to the crust’s principal axes, as opposed to following the crust’s angular velocity vector. The (bodyframe) precession frequency νp is νs∆Id/IC , where νs is the NS’s spin frequency and IC is the moment of inertia associated with the crustal nuclei, plus any component...

for a ∈ mn, the schur multiplier of a is defined as s a(x) =a ◦ x for all x ∈ mn and the spectral norm of s a can be stateas ∥s a∥ = supx,0 ∥a ∥x ◦x ∥ ∥. the other norm on s a can be definedas ∥s a∥ω = supx,0 ω(ω s( ax (x ) )) = supx,0 ωω (a (x ◦x ) ), where ω(a) standsfor the numerical radius of a. in this paper, we focus on therelation between the norm of schur multiplier of product of matric...

We investigate observational constraints on the cosmic equation of state from measurements of angular size for a large sample of milliarcsecond compact radio-sources. The results are based on a flat Friedmann-Robertson-Walker (FRW) type models driven by non-relativistic matter plus a smooth dark energy component parametrized by its equation of state p x = ωρ x (−1 ≤ ω < 0). The allowed interval...

Many reptiles, known as ‘sand swimmers’, adapt to their specific environments by vibrating or rotating body. To understand these type of interactions active objects with granular media, we study a simplified model self-excited spherical object (SO) immersed in the bed, using three-dimensional discrete element method (DEM) simulations. Modelling vibration an oscillatory motion, simulate longitud...

The origin of high velocities of pulsars is studied by considering the spin-flip conversion of neutrinos propagating in a gravitational field of a protoneutron star. For a rotating gravitational source (such as pulsars) with angular velocity , one finds that the spin connections (entering in the Dirac equation written in curved space time) induce an additional contribution to neutrino energy wh...

Background: Patients who undergo major orthopedic surgery are at risk of acute kidney injury (AKI) due to blood loss, electrolyte disorders, infection, and the presence of other co-morbidities. In this study, the frequency and risk factors of AKI were investigated. Objective & Methods: This study is a cross-sectional-analytical study with a sample size of 180 people. The studied population wer...