A specific HPLC method, with an RP-C-18 column and a UV detector, for simultaneous determination of vitamin E (tochopherol, T)/T acetate (TA) in four commercial and two experimental cosmetic products is described. Three solvent systems for extraction of T/TA were assessed: isopropyl alcohol; 10:90 v/v hexane-methanol mixture (method 1); and methanol alone (method 2). The procedure was accurate,...

By using the matrix exponential operator, solution of the system can be written as y(t) = exp(−tA)v. Numerical algorithms, which are based on this approach, are called exponential time integration methods. The essential point is that not the matrix exponential itself but rather its action on the vector v is computed. An attractive feature of the formula y(t) = exp(−tA)v is that it provides solu...

ObjectiveTo compare transabdominal (TA) and transrectal (TR) ultrasonography of the prostate gland. DesignExperimental study. Animals10 intact male dogs that required euthanasia for reasons other than prostatic disease. ProceduresProstatic length (L), width (W) and height (H) were measured in T A (L1, W1 and H1) and TR (L2 and H2) ultrasonography. Prostatic volume was calculated using the formu...

Various V-Ta-4Cr-4Ti quaternary alloys containing different amounts of Ta were investigated to determine the effect concentration on their tensile properties. Six button-shaped ingots V-xTa-4Cr-4Ti (x = 4, 8, 15, 22, 24, and 35 wt.%) fabricated a laboratory scale by using non-consumable arc-melting in argon atmosphere. The sheet specimens for all examined herein obtained cold-rolling; hot-rolli...

Hexakis(2,6-diisopropylphenylisocyanide)tantalum is the first isocyanide analogue of the highly unstable Ta(CO)6 and represents the only well-defined zerovalent tantalum complex to be prepared by conventional laboratory methods. Two prior examples of homoleptic Ta0 complexes are known, Ta(benzene)2 and Ta(dmpe)3 , dmpe=1,2-bis(dimethylphosphano)ethane, but these have only been accessed via liga...

In this study, we have investigated the microstructure and mechanical properties of two refractory high entropy alloys (RHEAs), Ti-V-Cr5-Nb-Ta Ti-V-Cr-Nb-Ta, in their as-cast heat-treated conditions. Both show almost single-phase BCC structure, while different size volume fraction secondary phases were formed after homogenisation heat treatment. The major phase was indexed as a complex C15 Lave...

Abstract Role of composition and the nature crosslinking on properties titania-chitosan beads have been investigated in detail. The investigations were done order to explore feasibility design synthesis with bespoke functionality based intended application. This would greatly enhance potential for industrial application these biopolymer beads. Beads varying compositions (of titania chitosan) pr...