Range-dependency in the background sound speed structure for deep ocean propagation scenarios is typical. Here a special case is considered when there is a gradual transition between single and double minimum sound speed profiles. Ray stability, an important measure for many applications, is analyzed. It is done by studying the unperturbed autonomous ray equations in the quasistatic limit. The ...

We present the ROSAT HRI X-ray measurements of 19 spectroscopically confirmed optically-selected QSOs in the 12′ radius region in the Selected Area 57. The optical-to-Xray spectral index αox ranges from 1.25 to 1.7, consistent with brighter QSOs. We have investigated the relationship between soft X-ray emission observed with the ROSAT HRI and optical colors (UJFN) of optically-selected QSOs in ...

Radiative energy losses are very important in regulating the cosmic ray electron and/or positron (CRE) spectrum during their propagation Milky Way. Particularly, Klein–Nishina (KN) effect of inverse Compton scattering (ICS) results less efficient high-energy electrons, which is expected to leave imprints on propagated spectrum. It has been proposed that hardening CRE spectra around 50 GeV obser...

Abstract In this study, the employment of X-ray irradiation as bioremediation method to treat parchment has been deeply investigated. particular, effect doses on structural stability collagen, main constituent parchment, evaluated a series modern samples by means different opto-thermal and spectroscopic techniques in order obtain dose-dependent collagen. Moreover, long-term behavior irradiated ...

A new detector geometry is described with relatively high gamma ray energy resolution at room temperature. The device uses the geometric weighting effect, the small pixel effect and the Frisch grid effect to produce high gamma ray energy resolution. The design is simple and easy to construct. The device performs as a gamma ray spectrometer without the need for pulse shape rejection or correctio...