Nondestructive Differentiation of Polyester Single White Fibers Using Synchrotron Radiation Microbeam X-ray Fluorescence Spectrometry with Vertical Focusing

In this study, the nondestructive differentiation of individual white polyester clothing fibers was accomplished via synchrotron radiation microbeam X-ray fluorescence (SR-μ-XRF) analysis. SR-μ-XRF with vertical focusing is a useful nondestructive method for the analysis of a single polyester clothing fiber. Kirkpatrick–Baez (KB) mirror was used to vertically focus 20 keV X-rays for the analysis of 22 individual white polyester fibers taken from clothing commonly sold in Japan. SR-μ-XRF with a vertical focused 2 μm (V) × 300 μm (H) beam was approximately 12.8 times more sensitive than SR-XRF with an unfocused 300 μm (V) × 300 μm (H) beam for the detection of elements in single fibers. The minimum detection limits (MDLs) of the SR-μ-XRF method were 8.15 ppm for Cl and 0.06 ppm for Br. In addition to Ti in TiO₂ delustering agents, Zr and Nb impurities in the delustering agents were detected in individual fibers. Sb from a polymerization catalyst and Co from a transesterification catalyst were also detected in individual fibers. Comparing the Ti K_β/Sb L_α,β and Zr K_α/Nb K_α X-ray intensity ratios was a useful way to distinguish individual clothing fibers, and 98% of the fibers were differentiated when additional trace elements were used as discrimination indicators.     

Direct identification of various copper phthalocyanine pigments in automotive paints and paint smears by laser desorption ionization mass spectrometry

Direct identification of copper phthalocyanine (CuPc) and chlorinated CuPcs in paints for discrimination between blue automobile paints by means of laser desorption mass spectrometry (LDMS) in the absence of a matrix is reported. The models consisted of eight commercially available CuPc pigments applied to a piece of plain white coating paper. The relationship between the peak intensity at m/z 575 of the CuPc, the number of pulsed laser shots, and laser power was compared to optimize laser abrasion. LDMS analysis of the model paints demonstrated that all characteristic components of the CuPc pigments in the paint films were in good agreement with those in the powder pigments. Further, the chlorinated CuPcs in the paint films could be distinguished. A quantity of 42 blue paint films, representing the paints used for painting Japanese domestic trucks, was examined by LDMS analysis. Results indicate that the paints can be classified into four categories based on the chlorinated CuPc components of the paints. Therefore, LDMS spectra of CuPc pigments would be useful for the identification of paints in forensic investigations. Herein, we report the successful identification of the CuPcs in a paint smear on the frame of a bicycle damaged in a hit-and-run accident, using the LDMS spectra.     

The atomic bomb and the citizens of Nagasaki

Abstract

Hiroshima is a universally recognized name today, but Nagasaki, the second city to suffer atomic bombing, is less well known, and in fact its destruction three days after Hiroshima seemed anticlimactic to many observers. The damage to both Japanese cities would be dwarfed in scale by any future nuclear holocaust, but the joint “Hiroshima-Nagasaki” experience, which changed the world forever, still constitutes the indispensable base of knowledge for an understanding of the human and environmental decimation which would be wrought by nuclear war. The way we choose to remember these two bombings will determine whether the human community can assimilate the meaning of these weapons before they are used again, and act decisively to spare our planet from the nuclear nightmare with which it is now threatened. This article is dedicated to helping cultivate the rationality, creative imagination and commitment to human welfare necessary to ensure that Nagasaki will be the last place on earth where nuclear weapons were ever used.     

Does strong patent protection facilitate international technology transfer? Some evidence from licensing contracts of Japanese firms

This paper examines how patent protection in a technology recipient country affects international technology transfer. A theory suggests that the effect of stronger patent protection on technology transfer is negative if the binding constraint is the imitation profitability and positive if it is the incentive for the licensor to undertake technology transfer. We evaluate these implications by examining the variations of the structure of licensing contracts across countries, based on a newly collected database of licensing contracts by Japanese firms. Our major findings are the following. First, the incidence of know-how licensing, either in the pure or in the bundled form, relative to that of pure patent licensing, declines significantly with the level of foreign patent protection. This indicates a limited role of patents for facilitating know-how licensing. Secondly, the probability and the strength of ownership control by a licensor declines with the level of patent protection, indicating a positive effect of stronger patent protection in expanding the scope of the recipients of technology transfer.