31,938 research outputs found
Fine-tuning of process conditions to improve product uniformity of polystyrene particles used for wind tunnel velocimetry
Monodisperse polymer particles (having uniform diameter) were used for the last two decades in physical, biological, and chemical sciences. In NASA Langley Research Center monodisperse polystyrene particles are used in wind tunnel laser velocimeters. These polystyrene (PS) particles in latex form were formulated at the Engineering Laboratory of FENGD using emulsion-free emulsion polymerization. Monodisperse PS latices particles having different particle diameters were formulated and useful experimental data involving effects of process conditions on particle size were accumulated. However, similar process conditions and chemical recipes for polymerization of styrene monomer have often yielded monodisperse particles having varying diameters. The purpose was to improve the PS latex product uniformity by fine-tuning the process parameters based on the knowledge of suspension and emulsion polymerization
All spherically symmetric charged anisotropic solutions for compact star
In the present paper we develop an algorithm for all spherically symmetric
anisotropic charged fluid distribution. Considering a new source function
we find out a set of solutions which is physically well behaved and
represent compact stellar models. A detailed study specifically shows that the
models actually correspond to strange stars in terms of their mass and radius.
In this connection we investigate about several physical properties like energy
conditions, stability, mass-radius ratio, electric charge content, anisotropic
nature and surface redshift through graphical plots and mathematical
calculations. All the features from these studies are in excellent agreement
with the already available evidences in theory as well as observations.Comment: 28 pages, 15 figures, major changes in the text. arXiv admin note:
text overlap with arXiv:1408.5126 by other author
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