The optical absorptivities of oriented single crystals of hcp Gd, Tb, Dy, Ho, Er, Tm, and Lu were measured at 4.2 K between 0.2 and 4.4 eV. Polarized radiation was used to reveal the optical anisotropy. Systematic movement of structures in the absorptivity and optical conductivity was observed as a result of trends within sp and d bands. Low-energy structures were related to effects of s−f exch...

We identify a family of unusual slow-light modes occurring in lossy multimode grating waveguides, for which either the forward or backward mode components, or both, are degenerate. In the fully degenerate case, the response can be modulated between coherent perfect absorption (zero reflection) and perfect reflection by varying the wave amplitudes in a uniform input waveguide. The perfectly abso...

We explore the preliminary design of a space habitat thermally controlled using phase change materials (PCMs). The PCM is used to maintain suitable, habitable temperature inside by isolating it from external solar radiation. system studied numerically considering only diffusive heat transport (conduction), scenario with practical application microgravity or reduced gravity environments. dynamic...

a simple and sensitive extractive- spectrophotometric method for thedeterrnination of trace amounts of vanadium(v) is reported. the method is based on the quantitative extraction of the anion complex of v(v) with 4-(2-pyridy1azo)-resorcinol with tetrabutylammonium perchlorate into chloroform, followed by spectrophotometric measurements at 554 nm. beer's law is obeyed over the concentration...

The polymer/ferroferric oxide (Fe3O4) foam and aerogel composites generally exhibit superior radar absorptivity performance. However, these have poor mechanical thermal properties. This study manufactured a polylactic acid (PLA)/Fe3O4 bio-composite evaluated the absorptivity, thermal, properties of radar-absorbing material. were prepared using solvent casting method to mix PLA Fe3O4 at varying ...

It is shown that the superradiance modes always exist in the radiation by the (4 + n)-dimensional rotating black holes. Using a Bekenstein argument the condition for the superradiance modes is shown to be 0 < ω < mΩ for the scalar, electromagnetic and gravitational waves when the spacetime background has a single angular momentum parameter about an axis on the brane, where Ω is a rotational fre...

Methods presently used for the determi­ nation of serum iron and unsaturated ironbinding capacity have somewhat limited spectrophotometric sensitivity. Since molar absorptivity of a metal-ligand complex is a relative measure of sensitivity, an increase in the former improves accuracy in the de­ termination of trace constituents, especially when they are abnormally low. Obviously, low amounts of...

Abstract State-of-the-art climate models exhibit significant spread in the climatological value of atmospheric shortwave absorption (SWA). This study investigates both possible causes and climatic impacts this SWA intermodel spread. The global-mean largely originates from difference water vapor absorptivity. Hence, we alter absorptivity Community Earth System Model, version 1, with Atmosphere 4...