Localization of Nanofibers on Polymer Surface Using Interface Transfer Technique

A new method to localize polymer nanofibers on a polymer surface was verified using interface transfer technique of nanofibers between immiscible polymer pairs. Nanofibers of poly(butylene terephthalate) (PBT) were prepared in a molten polypropylene (PP) by melt stretching and subsequent quenching. The obtained composite of PP containing PBT nanofibers was compressed into a flat sheet and piled with a sheet of high-density polyethylene (HDPE). During annealing procedure of the piled sheets at the temperature between Tm’s of PP and PBT, PBT nanofibers were transferred from PP to HDPE. Consequently, PBT fibers was confirmed on the surface of HDPE. Similarly, polytetrafluoroethylene (PTFE) nanofibers dispersed in a molten PLA, which were obtained by mechanical blending process, were found to move to PP during annealing procedure at the temperature between Tm’s of PLA and PTFE. This movement leads to the modification of surface tension for PP. Furthermore, the piled sheets of PP/PBT and HDPE as well as those of PLA/PTFE and PP were easily separated each other because of the immiscible nature

PARALLEL PROCESSING OF RESOLUTION

In this paper, PArallel Resolution Algorithm (PARA) is described to improve the execution efficiency in resolution process. PARA consists of two parts: parallel unification and generation of a resolvent. The first part is characteristic of PARA, which partitions whole set of expressions W into independent clusters as pre-processing and unifies each cluster in parallel. The efficient implementation for the processing peculiar to PARA is presented and checked by means of the experiment in comparison of execution efficiency of resolution. Experimental results show PARA is very effective in occurrence of many clusters

CALCIFYING EPITHELIAL ODONTOGENIC TUMOR: HISTOCHEMICAL AND ELECTRON MICROSCOPIC OBSERVATIONS ON A CASE

A case of calcifying epithelial odontogenic tumor was studied histochemically and electron microscopically. This case was characterized by an abundant amount of homogeneous substance and the presence of numerous clear cells. Although the homogeneous substance was shown to be an amyloid material in nature, it was supposed to be an extracellular product of the epithelial tumor cells. The clear cells contained abundant glycogen gunnies in their cytoplasm