The nonmodal approach is a linear theory formalism that emphasizes the transient evolution of a perturbed equilibrium. It differs from the normal-mode analysis by not assuming an exponential behavior of physical perturbations. We discuss works that have applied the nonmodal formalism to the problem of solar wind heating and acceleration. We briefly review the methodology of the Kelvin formalism...

Using density functional simulations, within the generalized gradient approximation and projectoraugmented wave method, we study structures and energetics of CaSiO3 perovskite in the pressure range of the Earth’s lower mantle (0–150 GPa). At zero Kelvin temperature the cubic ðPm 3mÞ CaSiO3 perovskite structure is unstable in the whole pressure range, at low pressures the orthorhombic (Pnam) str...

The behaviour of polymeric pipes in transient flows has been proved to be viscoelastic. Generalized Kelvin–Voigt (GKV) models perform very well when simulating the experimental pressure. However, literature, no general indications on evaluation model parameters are given. In present study, calibration GKV is carried out using a micro-genetic algorithm for tests taken from literature. results co...

Creep refers to the deformation of rock with time under long-term applied stress, which occurs in most underground engineering. The creep behavior granite Shuangjiangkou powerhouse Western Sichuan Province, China, was studied by tests. Based on test results, a new parameter DPR, ratio deviatoric stress peak strength, is proposed. DPR found be key describe parameters such as instantaneous elasti...

The principal purpose of this work is the simulation of the ship wake in Synthetic Aperture Radar (SAR) imaging based on a facet scattering model. The hydrodynamic model of the surface waves mainly considers the Kelvin wake waves and the wind driven waves. For the prediction of radar returns from the composite surface, the semi-deterministic facet scattering model (SDFSM) is proposed, which is ...

A Monte Carlo inverse method has been used on the temperature profiles measured down through the Greenland Ice Core Project (GRIP) borehole, at the summit of the Greenland Ice Sheet, and the Dye 3 borehole 865 kilometers farther south. The result is a 50, 000-year-long temperature history at GRIP and a 7000-year history at Dye 3. The Last Glacial Maximum, the Climatic Optimum, the Medieval Warm...

From the analysis of a set of airborne images of ship wakes, we show that the wake angles decrease as U(-1) at large velocities, in a way similar to the Mach cone for supersonic airplanes. This previously unnoticed Mach-like regime is in contradiction with the celebrated Kelvin prediction of a constant angle of 19.47° independent of the ship's speed. We propose here a model, confirmed by numeri...

background: the aim of this study was to assess the associations between nutrition and dental caries in permanent dentition among schoolchildren. methods: a cross-sectional survey was undertaken on 698 schoolchildren aged 10 to 12 yr from a random sample of primary schools in kermanshah, western iran, in 2014. the study was based on the data obtained from the questionnaire containing informatio...

the purpose of this research was to investigate the effectiveness of eclectic model based on acceptance and commitment therapy (act) and metacognitive therapy (mct) on symptoms in patient with pure generalized anxiety disorder. the research method was clinical experimentation with pre-posttest and control group. statistic community was all of the men and women patients that suffered from pure g...

Abstract Nonwater reacted polyurethane grouting materials are new developed to make up for the shortcomings of water-reactive in emergency rescue. However, its viscoelastic properties and constitutive model under dynamic loads have not been systematically studied. Based on thermal mechanical analysis (DMA), indexes such as storage modulus, loss factor nonwater polymer material were obtained, fr...