Active and sterile neutrino oscillations inside the Sun in a phenomenological (3+1+2)-model

A generalized model with three active and three sterile neutrinos is considered on the basis of the experimental data, which allow existence of anomalies beyond the minimally extended Standard Model with three active neutrinos with different masses. One of the sterile neutrinos is assumed to be comparatively heavy versus the two others, that is corresponding to the $(3+1+2)$-model of neutrino. The model parameters used for the description of oscillations of both active and sterile massive neutrinos are given. In the approximation of CP-conservation, the solar neutrino oscillation characteristics together with the sterile neutrino contributions have been evaluated taking into account the neutrino interaction with the matter inside the Sun. The results obtained are in accordance with the observational data and can further be used for the description of neutrino oscillations in astrophysical and terrestrial environments and in search of sterile neutrinos.Comment: 7 pages, 3 figures, revised version with significant modifications, typos and style correcte

Landau damping in thin films irradiated by a strong laser field

The rate of linear collisionless damping (Landau damping) in a classical electron gas confined to a heated ionized thin film is calculated. The general expression for the imaginary part of the dielectric tensor in terms of the parameters of the single-particle self-consistent electron potential is obtained. For the case of a deep rectangular well, it is explicitly calculated as a function of the electron temperature in the two limiting cases of specular and diffuse reflection of the electrons from the boundary of the self-consistent potential. For realistic experimental parameters, the contribution of Landau damping to the heating of the electron subsystem is estimated. It is shown that for films with a thickness below about 100 nm and for moderate laser intensities it may be comparable with or even dominate over electron-ion collisions and inner ionization.Comment: 15 pages, 2 figure

Survey and Systematization of Secure Device Pairing

Secure Device Pairing (SDP) schemes have been developed to facilitate secure communications among smart devices, both personal mobile devices and Internet of Things (IoT) devices. Comparison and assessment of SDP schemes is troublesome, because each scheme makes different assumptions about out-of-band channels and adversary models, and are driven by their particular use-cases. A conceptual model that facilitates meaningful comparison among SDP schemes is missing. We provide such a model. In this article, we survey and analyze a wide range of SDP schemes that are described in the literature, including a number that have been adopted as standards. A system model and consistent terminology for SDP schemes are built on the foundation of this survey, which are then used to classify existing SDP schemes into a taxonomy that, for the first time, enables their meaningful comparison and analysis.The existing SDP schemes are analyzed using this model, revealing common systemic security weaknesses among the surveyed SDP schemes that should become priority areas for future SDP research, such as improving the integration of privacy requirements into the design of SDP schemes. Our results allow SDP scheme designers to create schemes that are more easily comparable with one another, and to assist the prevention of persisting the weaknesses common to the current generation of SDP schemes.Comment: 34 pages, 5 figures, 3 tables, accepted at IEEE Communications Surveys & Tutorials 2017 (Volume: PP, Issue: 99

Energy-based approach to lifetime calculation under random loading

The fatigue life computation method, based on energy criterion of fatigue damage and model of material cyclic deformation after overload under the conditions of random loading is suggested. The determination of the maximum stress amplitude depending on the number of recycling for loading time before failure is provided. The results of the fatigue life estimation under the conditions of homogeneous stressed state are compared with experimental data obtained by S. Svenson, with spectral damage summation theory by V. L. Raiher and with linear summation hypothesis. The dependence of the right part of linear hypothesis depending on dispersion of random loading process is established

On the approximation of local and linear radiative damping in the middle atmosphere

The validity of approximating radiative heating rates in the middle atmosphere by a local linear relaxation to a reference temperature state (i.e., ‘‘Newtonian cooling’’) is investigated. Using radiative heating rate and temperature output from a chemistry–climate model with realistic spatiotemporal variability and realistic chemical and radiative parameterizations, it is found that a linear regressionmodel can capture more than 80% of the variance in longwave heating rates throughout most of the stratosphere and mesosphere, provided that the damping rate is allowed to vary with height, latitude, and season. The linear model describes departures from the climatological mean, not from radiative equilibrium. Photochemical damping rates in the upper stratosphere are similarly diagnosed. Threeimportant exceptions, however, are found.The approximation of linearity breaks down near the edges of the polar vortices in both hemispheres. This nonlinearity can be well captured by including a quadratic term. The use of a scale-independentdamping rate is not well justified in the lower tropical stratosphere because of the presence of a broad spectrum of vertical scales. The local assumption fails entirely during the breakup of the Antarctic vortex, where large fluctuations in temperature near the top of the vortex influence longwave heating rates within the quiescent region below. These results are relevant for mechanistic modeling studies of the middle atmosphere, particularly those investigating the final Antarctic warming