Proceedings of JSPE Semestrial Meeting

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We have tried to process many materials by acting the oxidization/reduction reactions of electron and hole provided by irradiating an ultraviolet ray on photocatalyst and fluorescent substance, and by applying the mechanical scratch action of photocatalyst and abrasive grit. A fundamental work of an ultraviolet-ray aided machining study verifies the polishing phenomena of A5052. The XPS qualitative analysis estimates the chemical reaction induced on Al-surface that was dipped in some solutions. The TXRF analyses the elements on a surface of A5052. The ICPS quantitatively analyses the oxidation/dissolution volume of Al, Mg and Fe. The following conclusions are obtained by discussing a polishing process of A5052. Aluminum does not resolve into TiO₂-solution, and the change of A5052-surface is small in polishing with TiO₂-slurry. Aluminum merely resolves in Cathilon-solution, and polishing with Cathilon-slurry provides a small change of A5052-surface. Though a little volume of Al resolves in TiO₂-Cathilon solution forming the chloride in ultraviolet-ray irradiation, the oxide, nitrogen oxide and nitride form on Al-surface. TiO₂-Cathilon slurry makes flat A5052-surface in polishing in ultraviolet-ray irradiation.

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X-rays generated by a light source are guided to the experimental apparatus using several X-ray optical devices, such as mirror optics, monochromators, refractive lenses, and so on. A mirror is one of the most widely used optical devices, and the surface shape of the mirror significantly affects the quality of X-rays at the sample position. Plane or nearly plane surfaces can be measured by, for example, using an interferometer and a slope profiler. However, focusing mirrors used for soft X-ray focusing and single-nanometer hard X-ray focusing have significantly small curvature radii of a few meters. It is difficult to measure the shapes of these mirrors using conventional methods. We have developed a novel measurement system that uses a laser focus microscope as a probe for measuring steeply curved mirrors.

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In our previous studies, the possibility of thin ceramic film formation by using a large-area EB irradiation was shown. However, the film formation mechanism has not yet been clarified. In this report, the influences of magnetic and electrical conductivity of a jig supporting an alumina target tube on the film formation were investigated, and the spectrum of plasma generated on the substrate surface during the EB irradiation was measured in order to clarify the mechanism. As a result, it was made clear that the film was formed by sputtering target material with the plasma of workpiece material caused by EB Irradiation.

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In this paper, an approach is presented for finding an intersection curves between triangulated mesh (designed geometry) and point cloud data (acquired geometry). We use projection based Moving Least Squares (MLS) surface as the underlying surface representation for acquired point-sampled geometry. This phase can be viewed as first step towards direct Boolean operation between such meshed surface and point cloud data. Based on MLS surface definition, an algorithm is developed to find the intersection point between plane and MLS surface. We then extend this algorithm to intersect entire mesh model with point cloud. Once intersection points are known it is possible to carry out Boolean operation and generate hybrid model.

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