In a recent study on the optical rotatory dispersion of proteins with improved spectropolarimetric techniques, the negative Cotton effect with the trough in the optical rotatory dispersion curves at 233 rnp was investigated (1). According to Simmons, Blout, et al. (2, 3), the amplitude of this effect is related to the amount of the a-helical conformation. The same seems to be true of the positi...

In this paper, a new structure is provided for the dispersion compensating photonic crystal fibers in order to broaden the chromatic dispersion and increase the dispersion compensating capability in a wide wavelength range. In the structure, putting elliptical holes in the first ring of the inner core clad of a dispersion compensating fiber of the hexagonal lattice, increases the wavelength ran...

thalassemia major patients require repeated transfusions of packed cell and their lysis lead to iron deposition especially in the cardiac walls such as septum and posterior wall, so make thickening and cause cardiac disorders. in this case-control study, our object was to appoint if qt and qtc and te dispersions were predictors of cardiac disorders in thalassemia major patients or not. 34 thala...

meloxicam is a poorly water soluble non steroidal anti-inflammatory drug and antipyretic agent. the aim of the present work was to investigate the effect of different types of carriers on in vitro dissolution of meloxicam. meloxicam solid dispersions were prepared by physical mixing, co-grinding and solvent evaporation methods with polyethylene glycol (peg) 6000. the effect of solubilization by...

waveguides with low confinement loss, low chromatic dispersion, and low nonlinear effects are used in optical communication systems. optical fibers can also be employed in such systems. besides optical fibers, photonic crystal fibers are also highly suitable transmission media for optical communication systems. in this paper, we introduce two new designs of index-guiding photonic crystal fiber ...

in this study the effect of using multi-walled carbon nanotube (mwcnt) on flexural and compressive strengths, ultimate displacement and energy absorption capability of standard cement mortar considering different weight percentages of nanotubes as well as different dispersion methods has been investigated. influential point in adding nanotubes to the composites is their proper dispersion, which...

Abstract Roadway sanding is a common practice in cold regions because sand increases the roadway friction when mixing with snow. However, after snow melt, sand imposes potential hazards to the traffic. Recovery of sand from highways has become an increasing concern not only for the reason of traffic safety, but also for being nonpoint pollution sources to nearby wetlands and streams. In this st...