It is demonstrated theoretically that the absorptivity of bulk shear sagittal waves by an ultra-thin layer of viscous fluid between two different elastic media has a strong maximum (in some cases as good as 100%) at an optimal layer thickness. This thickness is usually much smaller than the penetration depths and lengths of transverse and longitudinal waves in the fluid. The angular dependencie...

In this paper, we propose an angle- and polarization-insensitive metamaterial absorber. We design a metamaterial unit cell that is based on a split ring cross resonator (SRCR). We observe that the absorption frequency and absorption ratio are insensitive to incident angles when a via array surrounds the SRR. We demonstrate the effect of the via array using full-wave simulations by comparing the...

A 1 kW CW green laser source operating at 515 nm was used to investigate the absorptivity of pure copper powder beds and substrates. Various interaction regimes were considered, ranging from solid and/or layers, liquid state up deep penetration keyhole regime. Reflectance measurements carried out using an Ulbricht integrating sphere during static tests single L-PBF tracks. For each experiment, ...

The measurement of the microwave absorptivity of materials typically requires expensive and arcane equipment and methods. I show that, for moderately absorbing materials (loss tangent δ ' 0.005 or higher), useful measurements can be easily made using a thermometer and a normal domestic microwave oven: the heat absorbed for suitably designed sample size and geometry relates directly to the absor...

W ith protein biologics, it is critical to accurately determine an absorptivity constant. The constant is then used when routinely measuring protein concentration by ultraviolet (UV) spectrophotometry. The yield of product during manufacture and the product content and potency on the label are dependent on this constant. There have been several approaches in the past to determining the constant...

Low solar absorptivity, space environmentally stable polymeric materials possessing sufficient electrical conductivity for electrostatic charge dissipation (ESD) are of interest for potential applications on spacecraft as thin film membranes on antennas, solar sails, large lightweight space optics, and second surface mirrors. One method of imparting electrical conductivity while maintaining low...

The rational improvement of photophysical properties can be highly valuable for the discovery of novel organic fluorophores. Using our new design strategy guided by the oscillator strength, we developed a series of full-color-tunable furoindolizine analogs with improved molar absorptivity through the fusion of a furan ring into the indolizine-based Seoul fluorophore. The excellent correlation b...

[1] Ontario Lacus is the largest and best characterized lake in Titan’s south polar region. In June and July 2009, the Cassini RADAR acquired its first Synthetic Aperture Radar (SAR) images of the area. Together with closest approach altimetry acquired in December 2008, these observations provide a unique opportunity to study the lake’s nearshore bathymetry and complex refractive properties. Av...