Deep, near–infrared imaging surveys have been motivated by the desire to study the rest–frame optical properties and stellar content of galaxies at high redshift. Here we briefly review their history, and illustrate one application, using HST NICMOS imaging of the Hubble Deep Field North to examine the rest–frame optical luminosities and colors of galaxies at 2 < z < 3, and to constrain their s...

The purpose of this paper is to present an optical test platform for high bit rate DWDM systems. The developed platform is transparent and independent of the format of the optical signals, number of WDM channels and transmission ratios. It enables the laboratory simulation of real systems with multi-wavelength and high bit rates optical networks.

Presolar grains are considered to have traces in their birth before the solar system formation in their isotopic and elemental features. Most of silicon carbide type X (SiC X) and low density graphite grains show the excesses of 12C and 28Si. These isotopic features suggest that SiC X and low density graphite are originating from supernovae. On the other hand, elemental signatures of the grains...

Abstract We present a detailed analysis of the rest-frame UV and optical emission-line spectrum partially obscured quasar J121704.70+023417.1 (hereafter J1217+0234). Here obscuring material, very likely dusty torus invoked by AGN unification models, acts as natural coronagraph, which greatly suppresses both continuum broad-line emission in enables clear detection three components at beyond scal...

Recently synthesized industrially significant perovskites Cs3Cu2X5 (X=Cl,Br,I) are subjected to a density functional theory (DFT) investigation utilizing the CASTEP code. This study explores various physical features, including structural, optical, thermodynamic, elastic, mechanical, and electronic properties. There is strong correlation between optimized structure parameters existing experimen...