In this paper, dynamic and stability analysis of a flexible cam-follower system is investigated. Equation of motion is derived considering flexibility of the follower and camshaft. Viscous and Coulomb frictions are considered in the rocker arm pivot. The normalized equation of motion of the system is a 2nd- order differential equation with periodic coefficients. Floquet theory is employed to s...

A new dynamic friction model for modeling of elliptical vibration assisted turning (EVAT) was developed in this research. The periodic change of the friction force direction is known to be one of the most important causes of this phenomenon. In modeling of machining processes (including the EVAT process), static Coulomb friction model was employed by most of the researchers. Because of the peri...

We study the properties of a completely integrable deformation of the CGHS dilaton gravity model in two dimensions. The solution is shown to represent a singularity free black hole that at large distances asymptoticaly joins to the CGHS solution. One of the fundamental unsolved problems in theoretical physics is the unification of quantum theory and gravity. One of the reason why this is so dif...

Abstract Chemical substitution is a promising route for the exploration of rich variety doping- and/or disorder-dependent collective phenomena in low-dimensional quantum materials. Here we show that transition metal dichalcogenide alloys are ideal platforms to this purpose. In particular, demonstrate emergence superconductivity otherwise metallic single-layer TaSe 2 by minute electron doping pr...

An exact map was established by Lacroix-A-Chez-Toine, Majumdar, and Schehr in [44] between the $N$ complex eigenvalues of non-Hermitian random matrices from Ginibre ensemble, positions non-interacting Fermions a rotating trap ground state. important quantity is statistics number $\mathcal{N}_a$ disc radius $a$. Extending work covering Gaussian rotationally invariant potentials $Q$, we present r...

We investigate the color-Coulomb confinement scenario using a SU(3) lattice gauge simulation. It is shown that the color-Coulomb heavy-quark potential, defined from the instantaneous part of the gluon propagator in Coulomb gauge, behaves as a linearly rising potential at large distances, and the resulting Coulomb string tension is greater than the Wilson-loop string tension. We study also the b...

In this article, we examine the possibility that there exist special scalar-tensor theories of gravity with completely nonsingular FRW solutions. Our investigation in fact shows that while most probes living in such a Universe never see the singularity, gravity waves always do. This is because they couple to both the metric and the scalar field, in a way which effectively forces them to move al...

Basis and limitations of singularity theorems for Gravity are examined. As singularity is a critical situation in course of time, study of time paths, in full generality of Equivalence principle, provides two mechanisms to prevent singularity. Resolution of singular Time translation generators into space of its orbits, and essential higher dimensions for Relativistic particle interactions has f...

We study the properties of a future singularity encountered by a perfect fluid observer in tilting spatially homogeneous Bianchi cos-mologies. We derive the boost formulae for the Weyl tensor to establish that, for two observers that are asymptotically null with respect to each other, their respective Weyl parameters generally both tend to zero, constant, or infinity together. We examine three ...