Improvement of surface transferability of an blow-molded polymer was examined by using heat insulating layer-coated molds. Linear type polyimide (PI) and ABS resins were used as the heat insulating ...material and molding polymer, respectively. Although the transferability of the mirror-finished mold surface depends both on the thickness of PI layer and on the molding conditions, e. g., temperature of polymer and temperature of mold, the PI layer of more than 0.2 mm thickness is necessary to obtain sufficient transferability. In order to examine the relation between the thickness of heat insulating layer and the improvement of surface transferability due to the PI layer, the time-dependent temperature distribution near the mold-polymer boundary was numerically studied. The results showed that the temperature of PI layer coated on the mold surface rises immediately after the layer is in contact with the polymer melt, and that the period during which the mold surface temperature is kept high increases with increasing the PI layer thickness. We therefore concluded that the blow pressure applied during the period is effective for improving the surface transferability of the molded article.
It is well known that electromag netic interference (EMI) generated from various sources can interfere with normal implantable cardiac pacemaker function. However, no data are available for the ...pacemakers currently encountered in the market place. In the present study we examined the influence of EMI on in vivo and in vitro pacemakers, with an emphasis on the ambient magnetic field and electric field measurements. Eleven pacemakers from nine manufacturers were evaluated in as close to physiological circumstances as possible. The measured magnetic field strengths from several interference sources encountered in daily life, in the working process, and in medical practice were too low to result in device inactivation, except in medical diathermy and in mobile phone use. Medical diathermy produced a noise response in all devices except Medtronic KAPPATM DR and Vitatron DIAMONDTM II. No pacemaker function changes were seen due to electrical interference. During diathermy exposure, high levels of electrical fields were measured at a distance of up to 50 cm. There were no cross-programming of interaction between pacemakers and inappropriate programmers (different manufacturers). Among the different exogenous interference sources, no pacemaker currently distributed was found to be influenced in a detrimental way, ie: oversensing or no output. Despite our results, EMI cannot be ignored entirely because EMI of increasing variety and complexity are more frequently encountered today.
In this paper, the seismic capability of existing steel cable-stayed bridges was checked by nonlinear seismic response analysis using the observed records that were obtained at the 1995 Hyogoken ...Nanbu Earthquake. The effect of boundary condition (consideration of soil spring), modeling of bearing supports on the pier, existence of tuned mass dampe
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