We perform a propagation calculation for cosmic ray electrons and positrons using a three-dimensional di usion model, and use the resulting interstellar total electron spectrum to obtain the galactic di use photon spectrum due to inverse Compton, synchrotron and bremsstrahlung interactions consistently from radio to PeV energies. By considering the observed galactic non-thermal emission, we con...

Abstract—This study was conducted to evaluate the seismic performance of weir structures using two different approaches: i) design response spectrum with respect to KBC 2009 in Korea and ii) acceleration of time history (PGA, 0.3011 g) obtained from 1994 Northridge earthquake. This paper provided the simple linear elastic 2D plane strain FE model with the material nonlinearity including soil-fo...

I review the current status of Fermi acceleration theory at relativistic shocks. I first discuss the relativistic shock jump conditions, then describe the nonrelativistic Fermi mechanism and the differences introduced by relativistic flows. I present numerical calculations of the accelerated particle spectrum, and examine the maximum energy attainable by this process. I briefly consider the min...

Abstract Based on the coupling res model of vehicular and road, influences surface layer modulus, thickness equivalent modulus elasticity spectrum acceleration, deflection under wheels, strain at distance 0.4 m to 0.8 away from wheels are analyzed. Results show that fundamental frequency road pavement increases with growth elasticity, decreases increase thickness. Both deflections strains decre...

Brazil is in an intraplate area of low to moderate seismicity, this means that few or no records strong ground motions are available. Part the site response analysis and seismic design structures require use acceleration time-histories compatible with a specified target spectrum. This study aims utilize methodologies based on existing earthquake from well-known database synthetic accelerograms ...

Theory of the first-order Fermi acceleration of cosmic ray particles at relativistic shock waves is reviewed. We consider shocks with parallel and oblique, suband super-luminal magnetic field configurations and with finite-amplitude magnetic field perturbations. A role of oblique field configurations and field perturbations in forming the cosmic ray energy spectrum and changing the acceleration...

We calculate the spectra of two-component accretion flows around black holes of various masses, from quasars to nano-quasars. Specifically, we fit the observational data of M87 very satisfactorily using our model and find that the spectrum may be well fitted by a sub-Keplerian component alone, and there is little need of any Keplerian component. The non-thermal distribution of electrons produce...

The CIII and CIV lines in the [WC9] spectrum of BD+303639 show variable features, interpreted in terms of radiative acceleration of “blobs” forming in the wind. The variations are like those observed for theWC9massive stars, and the blobs acceleration appears smaller than for the [WC8] nucleus of NGC 40.

The surprising lack of a high energy cutoff in the cosmic ray spectrum at the highest energies together with an apparently isotropic distribution of arrival directions have strongly challenged most models proposed for the acceleration of ultra high energy cosmic rays. Young neutron star winds may be able to explain the mystery. We discuss this recent proposal after summarizing the observational...