The photostabilization of poly(vinyl chloride) (PVC) films having five Schiff’s bases derived from sulphamethoxazole has been investigated. The casting method was used to produce PVC films containing sulphamethoxazoles (0.5% by weight), in tetrahydrofuran. The photostabilization activities of five additives were determined by monitoring the hydroxyl, polyene and carbonyl indices with irradiatio...

Metals are generally considered good reflectors over the entire electromagnetic spectrum up to their plasma frequency. Here we demonstrate an approach to tailor their absorbing characteristics based on the effective metamaterial properties of thin, periodic metallo-dielectric multilayers by exploiting a broadband, inherently non-resonant, surface impedance matching mechanism. Based on this mech...

Prolonged exposure to ultraviolet (UV) radiation from the sun can result in several skin problems, such as accelerating aging, burns, blemishes, or even cancer. Even when wearing clothes, there is still a risk that user will be exposed UV and suffer damage. Therefore, it necessary apply anti-UV treatments clothes fabrics used, so users become safe. Nitrogen doped graphene quantum dots (N-GQD) t...

High-throughput screening is a powerful approach for identifying new functional materials in unexplored material spaces. With library synthesis capable of producing 10(5) to 10(6) samples per day, methods for material screening at rates greater than 1 Hz must be developed. For the discovery of new solar light absorbers, this throughput cannot be attained using standard instrumentation. Screenin...

Spectroscopy of ten quasars obtained with the Goddard High Resolution Spectrograph (GHRS) of the Hubble Space Telescope (HST) is presented. We detect 357 absorption lines above a significance level of 3σ in the ten sightlines, and 272 lines above a significance level of 4.5σ. Automated software is used to detect and identify the lines, almost all of which are unresolved at the GHRS G140L resolu...

A sub-relativistic, thermal wind-type flow could represent the physical connection between the central engine and other observed components of the central region, such as the Broad Line Region (BLR) and X-ray/UV absorbers. Observational clues as to the existence of such outflows in radio-quiet Active Galactic Nuclei (AGNs) are provided, for instance, by blue shifted absorption lines in Seyferts...

Ultra-refractory diborides are currently studied mainly as thermal protection materials for aerospace and military applications. However, their favourable properties (very high melting points and good thermo-mechanical properties at high temperatures) can be advantageously exploited to increase the operating temperature of thermodynamic solar plants in concentrating solar power systems. This pa...

Results from an analysis of the intrinsic UV absorption in the Seyfert 1 galaxy NGC 3783 are presented. We focus on two new results that demonstrate techniques for deriving important constraints on the physical conditions and geometry of the absorbers. First, using variability in the spectrum, the emission-line profile is separated into distinct kinematic components and the effect on the interp...

Nonlinear excitation of fluorophores through molecular absorption of two or three near-infra-red photons from the tightly focused femtosecond pulses of a mode-locked laser offers the cellular biologist an unprecedented panoply of biomolecular indicators for microscopic imaging and cellular analysis. Measurements of the two-photon excitation spectra of 25 ultra-violet and visible absorbing fluor...

The synthesis of a series four porphyrin derivatives based on meso-tetrafluorenylporphyrin core functionalized with one to trans-chlorobis(dppe)ruthenium alkynyl units (dppe = 1,2-bis(diphenylphosphino)ethane) at the periphery, together cyclic voltammetry (CV) and UV–Vis absorption emission spectroscopy studies, are reported. In these multipolar assemblies, organoruthenium endgroups potential e...