We analyzed the blood flow inside blood vessels by computational fluid mechanics to investigate the fluid mechanical effect of the blood flow on the arterial wall with respect to various pathophysiological phenomena. We built 3D-computational fluid mechanical models to model the symmetrical and asymmetrical configurations and carried out computation using the models under steady and unsteady flow conditions. It was confirmed that no flow separation occurred at either the inner or the outer curvatures of the 3D-bifurcation models. Remarkable differences of the spatial pattern of the wall shear stress were found between the pulsatory flow and the steady flow computations.
Pyrrole derivatives which were substituted in the 3-position by an acyl and an alkyl, the 3, 4-position by an alkyl ring were synthesized (compounds with a two, six and ten carbons normal chain and a six carbons ring). Their conductivity and solubility were investigated. Electrooxidation in acetonitril/lithiumtetrafluoroborate led to the deposition of brittle black conducting polymer films on the anode. The conductivity decreased with substitution of free positions. These conducting polymers had not solubility.
A series of liquid-crystals with mesogenic butoxy biphenyl and various lengths of spacers were synthesized, and the properties of their liquid-crystals were investigated. The liquid-crystals synthesized showed smectic A (SA) mesophase. The crystal-to-mesophase transition temperatures increased with increasing lengths of spacers and polymerization degree.
After the used beverage can of aluminum is pulverized, the rubbish matter, sand and metals are separated from the aluminum chip. The chip is heated up to remove the synthetic resin attached to aluminum chip. Since the chip maintained at 300-350°C gets a little softened, the components of paints, such as TiO2, Cr2O3 and Fe2O3, are torn off easily by twisting strike during the granulation of softing chip.