A photothermal deflection experiment with a variable angle pump beam is presented. It is shown that directional absorptivity of rough or corrugated opaque samples can be measured by this technique. As an illustration the absorptivity in p an s polarization of a 2D surface-relief silicon grating is studied. Grating anomalies are detected and qualitatively discussed in the framework of an electro...

The change in absorptivity during the degradation process of materials is discussed, and its influence as one of the involved parameters in the degradation models is studied. Three materials with very different behaviors are used for the demonstration of its role: a carbon composite material, which is opaque, almost grey, a plywood slab, which is opaque and spectral-dependent and a clear PMMA s...

We have developed a new spectrophotometric assay for urinary N-acetyl-beta-D-glucosaminidase (NAGase) with use of sodio m-cresolsulfonphthaleinyl N-acetyl-beta-D-glucosaminide (MCP-NAG). MCP-NAG was synthesized from acetochloro-glucosamine and m-cresolsulfonphthalein (MCP) in four steps. MCP-NAG reacts well with NAGase (Km = 0.41 mmol/L) and is highly water soluble. The absorption maximum and m...

The developed Annual Columnar Radiative Absorptivity (ACRA19) model that describes, in annual mean, the terrestrial radiation balance of an atmospheric column, allows determination various regional, absorption and reflection solar infrared using 2018’s data eight sites MENA region ( between 22N-38N) latitude obtained from AERONET NASA POWER. thermal absorptivity (ATA) is very significant at hig...

The incorporation of squaraines into DNA via the phosphoramidite approach is described. High molar absorptivity, environment-sensitive fluorescence properties and intense CD effects render squaraines valuable building blocks for DNA-based optical probes and nanostructures.

We derive expressions for the spectral emissivity and absorptivity of acoustic radiation by low Mach number (M ~ 1) turbulent fluids. The emissivity and absorptivity depend on the manner in which the turbulence is excited. We consider three types of turbulence. The first is free turbulence, that is, turbulence which is not subject to external forces. The second and third examples are special ca...