The performance of carbon nanotube field-effect transistors is analyzed numerically, using the non-equilibrium Green's function formalism. The effect of electron-phonon scattering on both the DC and switching response of these devices is studied. For the calculation of the switching response, the quasi-static approximation is assumed. The role of the electron-phonon coupling strength and phonon...

The shear free condition is studied for dissipative relativistic self–gravitating fluids in the quasi–static approximation. It is shown that, in the Newtonian limit, such condition implies the linear homology law for the velocity of a fluid element,only if homology conditions are further imposed on the temperature and the emission rate.It is also shown that the shear–free plus the homogeneous e...

Machine tool calibration can be employed to optimise path trajectories through on- and off-line compensation of anticipated deflections, which result from a process plan, assess the machine tools capability comply with geometric dimensions tolerances plan. This work presents measurement for identification static quasi-static rotational stiffness joint 5-axis machining centres. shall serve as ba...

Hysteresis is a nonlinear phenomenon exhibited by systems stemming from various science and engineering areas. To detect experimentally the presence of hysteresis in a system, the graph output versus input of the system is plotted for different frequencies of the input. For hysteresis systems, these graphs converge to a quasi-static limit set when the frequency goes to zero. Moreover, the quasi...

Coherence of spins of electrons confined in III–V quantum dots is strongly affected by their hyperfine interaction with the nuclei. In this paper an introduction to this subject is presented. Some theoretical approaches to the problem will be outlined. Most attention will be given to the quasi-static bath approximation, to the cluster expansion theories of dephasing due to the nuclear dynamics ...

We consider the Hartree-Fock approximation of Quantum Electrodynamics, with the exchange term neglected. We prove that the probability of static electron-positron pair creation for the Dirac vacuum polarized by an external field of strength Z behaves as 1 − exp(−κZ2/3) for Z large enough. Our method involves two steps. First we estimate the vacuum expectation of general quasi-free states in ter...

A unified charge-based model for SOI MOSFETs is presented. The proposed model is valid and accurate from intrinsic to heavily doped channel with various structure parameter variations. The framework starts from onedimension Poisson-Boltzmann’s equation. Based on the full depletion approximation, an accurate inversion charge density equation is obtained. With the inversion charge density solutio...

We describe a library to compute various types of Green’s tensor for three-dimensional electromagnetic scattering calculations. This library includes the retarded and non-retarded (quasi-static) Green’s tensors for infinite homogeneous space and the non-retarded Green’s tensor associated with a surface. Both standard and filtered Green’s tensor can be computed. Filtered Green’s tensor can be us...

An accurate and efficient method was developed for computing the resonant frequencies of microstrip resonators. The formulation of the problem was carried out rigorously using the fullwave analysis rather than the quasi-static approximation. The characteristic equation was derived using Galerkin’s method applied in the Fourier transform domain. The accuracy of the method has been proven by comp...