Computational Fluid Dynamics Simulations of Aerosol Behavior in a High Speed (Heubach) Rotating Drum Dustiness Tester.

Potential exposure from hazardous dusts may be assessed by evaluating the dustiness of the powders being handled. Dustiness is the tendency of a powder to aerosolize with a given input of energy. We have previously used computational fluid dynamics (CFD) to numerically investigate the flow inside the European Standard (EN15051) Rotating Drum dustiness tester during its operation.

Investigation of thermoluminescence response and trapping parameters of natural barite samples from Dongargaon mine, India.

Dosimetry is a technique that quantitatively measures the ionizing radiation absorbed by matter. The present study was conducted on the barites from a mine at Dongargaon in Central India. Morphological and structural analysis of proposed sample was carried out using X-ray diffraction and standard error of the mean.

Photoluminescence studies and synthesis of BaSO Cl :Ce blue-emitting lamp phosphor.

The photoluminescence excitation and emission spectra of BaSO Cl :Ce phosphor were investigated. Excitation wavelength was 323 nm. The phosphor was prepared using a combustion synthesis method.

PHOTOLUMINESCENCE, THERMOLUMINESCENCE AND OPTICALLY STIMULATED LUMINESCENCE STUDIES IN ZINC-BASED FLUOROPERVOSKITES.

The optically stimulated luminescence, thermoluminescence and photoluminescence in various Cu and Ag doped zinc based fluoropervoskites are studied. In all the samples, photoluminescence of Cu+ and Ag+ is observed which could be attributed to 3d94 s1←→3d10 and 4d95 s1←→5d10 transitions, respectively. The observed emission is double humped and the main emission band shifts to the lower wavelength side with increasing ionic size of the alkali ion.

Preliminary results on the photoluminescence and optically stimulated luminescence in Cu-doped and Ag-doped ZnB X (B = Li, Na, K: X = Cl, Br) compounds.

Photoluminescence, and optically stimulated luminescence in ZnB X (B; Li,Na,K: X; Cl,Br) compounds doped with Cu or Ag were studied. Double humped emission bands attributable to the activators were observed in all the samples. The observed photoluminescence of Cu and Ag could be identified with 3d 4s ↔3d and 4d 5s ↔5d transitions respectively.

Surfactant-induced modification of low weber number droplet impact dynamics.

The effect of surfactant molecular mass transport on the normal impact and spreading of a droplet of its aqueous solution on dry horizontal substrates is investigated experimentally for a range of Weber numbers (20-100). The postimpact dynamics of film spreading and its recoil behavior are captured using high-speed real-time digital imaging. Hydrophilic (glass) and hydrophobic (Teflon) substrates were used with water and aqueous solutions of three different surfactants of varying diffusion rates and ionic characteristics: SDS (anionic), CTAB (cationic), and Triton X-100 (nonionic).

Developing pulsatile flow in a deployed coronary stent.

A major consequence of stent implantation is restenosis that occurs due to neointimal formation. This patho-physiologic process of tissue growth may not be completely eliminated. Recent evidence suggests that there are several factors such as geometry and size of vessel, and stent design that alter hemodynamic parameters, including local wall shear stress distributions, all of which influence the restenosis process.