Nanoporous anodic aluminum oxide (AAO) has been used in many different fields of science and technology, due to its great structural characteristics. Solar selective surface is an important application of this type porous material. This paper investigates the effect of nanoporous AAO properties, including; film thickness, pore area percentage and pore diameter, on absorption spectra in the rang...

Atomic absorption spectroscopy Atomic absorption spectroscopy (AAS) was developed in the early 1950’s by Alan Walsh. It works on the principle that certain elements absorb certain wavelengths, and this level of absorption is characteristic of each element. Also, electrons in atoms can only exist in particular energy levels, and when an electron moves to a higher energy level, electromagnetic ra...

1-Phenyl-3-(4-nitrophenyl)-5-(2-thienyl)-2-pyrazoline was synthesized and characterized by elemental analysis, IR and X-ray single crystal diffraction. UV-Vis spectra and fluorescence spectra were measured. Density functional theory calculations on the structure of the title compound were performed at the B3LYP/6-311G** level of theory. NPA atomic charge distributions indicate that, although th...

We report the detection of absorption by interstellar hydroxyl cations and water cations, along the sight-line to the bright continuum source W49N. We have used Herschel’s HIFI instrument, in dual beam switch mode, to observe the 972 GHz N = 1–0 transition of OH and the 1115 GHz 111−000 transition of ortho-H2O. The resultant spectra show absorption by ortho-H2O, and strong absorption by OH, in ...

2. Referenced Documents 2.1 ASTM Standards: D1318 Test Method for Sodium in Residual Fuel Oil (Flame Photometric Method) D3237 Test Method for Lead in Gasoline by Atomic Absorption Spectroscopy D3340 Test Method for Lithium and Sodium in Lubricating Greases by Flame Photometer D3605 Test Method for Trace Metals in Gas Turbine Fuels by Atomic Absorption and Flame Emission Spectroscopy D3831 Test...

Neutrino absorption cross sections for Ga are calculated for all solar neutrino sources with standard energy spectra, and for laboratory sources of Cr and Ar; the calculations include, where appropriate, the thermal energy of fusing solar ions and use improved nuclear and atomic data. The ratio, R , of measured ~in GALLEX and SAGE! to calculated Cr capture rate is R50.9560.07 ~expt!120.03 10.04...

A general approach for calculating spectral and optical properties of pigment-protein complexes of known atomic structure is presented. The method, that combines molecular dynamics simulations, quantum chemistry calculations, and statistical mechanical modeling, is demonstrated by calculating the absorption and circular dichroism spectra of the B800-B850 bacteriochlorophylls of the LH2 antenna ...