Osaka Kyoiku University
Osaka, Japan

Osaka Kyoiku University is a national university with headquarters in the city of Kashiwara, Osaka Prefecture, Japan and a branch campus in Tennōji-ku in the prefectural capital city of Osaka. It was established in 1949 by the merger of two predecessor institutions. Its short name is Daikyōdai. The university specializes in educating teachers. Unique among the national universities is its five-year program of nighttime study. Wikipedia.

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Tsujioka T.,Osaka Kyoiku University | Irie M.,Rikkyo University
Journal of Photochemistry and Photobiology C: Photochemistry Reviews | Year: 2010

Recent progress in electrical properties of photochromic molecules is reviewed. A typical application of the properties is current switching based on the changes in ionization potential or carrier mobility induced by the photoisomerization of photochromic molecules. Carrier injection-type molecular memories have also attracted wide interest because they are a promising candidate for organic semiconductor devices in the field of organic electronics. Various new applications are proposed using photo-induced electrical, as well as optical, property changes of photochromic molecules. © 2010 Elsevier B.V. All rights reserved.

Tsujioka T.,Osaka Kyoiku University | Matsui N.,Osaka Kyoiku University
Optics Letters | Year: 2011

Dual-functional diffraction gratings, which show different diffractions in transmission and reflection, are proposed as an essential optical element. We utilize a flattening effect of photochromic diarylethene (DAE) in the low glass transition temperature state and selective metal deposition to prepare the gratings. The uncolored lines of the colored DAE layer on a grating substrate with grooves were formed by red-laser scanning, and Mg evaporation onto the substrate without a shadow mask enabled Mg-line formation at right angles to the grooves. After being stored at 27 °C for 500 min, the sample showed two-dimensional diffraction in reflection but one-dimensional diffraction in transmission, meaning that a dual-functional grating was achieved. This result shows great potential as a key element for various future optical devices and systems. © 2011 Optical Society of America.

Fukue J.,Osaka Kyoiku University
Progress of Theoretical Physics | Year: 2011

Relativistic radiative transfer in a relativistic plane-parallel flow is examined in the fully special relativistic treatment. Under the assumption of a constant flow speed, we obtain simple analytical solutions of the relativistic radiative transfer equation for relativistic planeparallel flows in the cases of linear-flow and two-stream approximations. In both cases, the solutions exhibit exponential behavior on the optical depth. In addition, the optical depth τ in the exponential term is replaced by the apparent optical depth Γτ, where Γ is a function of the flow speed v (= βc); for example, in the case of the linear-flow approximation, Γ = γβ, γ being the Lorentz factor. This modification of the apparent/effective optical depth is an essential property of the relativistic radiative transfer. Furthermore, in the nonrelativistic regime, the radiative intensity in the comoving frame increases as the optical depth increases, whereas it approaches a constant value with the optical depth in the relativistic regime because of the exponential term. The radiation energy density in the comoving frame also approaches a constant value, while the radiative flux becomes zero as the optical depth increases. Such behavior of the radiative quantities in the comoving frame, which originates from the exponential term, is also an essential property of the relativistic radiative transfer.

Tsujioka T.,Osaka Kyoiku University
Journal of Materials Chemistry C | Year: 2014

Selective metal deposition signifies that metal vapor atoms are deposited on a hard organic surface but not on a soft (low glass transition temperature) surface. This paper introduces the origin, extension, and device applications of selective metal deposition. A photochromic surface shows the light-controlled selective metal deposition phenomenon, but the surface material is not essential to it; various organic surfaces including organic crystal and polymer surfaces can be used. We demonstrate the applications of selective metal deposition, including cathode patterning for organic light-emitting devices, micro thin-film fuses, and multifunctional diffraction grating. Selective metal deposition can be applied to a variety of electric and optic devices. This journal is © The Royal Society of Chemistry.

Fukue J.,Osaka Kyoiku University
Monthly Notices of the Royal Astronomical Society | Year: 2013

Observational appearances of a geometrically thin stratus (sheet-like gaseous cloud with finite optical depth) floating above a luminous illuminating source such as accretion discs are calculated under the viewpoint of radiative transfer for several configurations of strati. Due to scattering, the source images are generally changed. Of course, in the optically thin case, the stratus becomes almost transparent and the direct source light can be seen, while the source light is smeared out in the optically thick case. When the optical depth of the stratus is around unity, both the source and scattered lights can be seen. Due to reprocessing, on the other hand, the source spectra are generally modified, since there exist the direct source light, the scattered one and the reprocessed thermal one. Of these, the scattered light has the same spectra with the source one, although it is diluted. On the other hand, the reprocessed thermal light generally shifts towards the lower energy due to the dilution effect and is modified depending on the configuration of strati. For example, in the case of a slab configuration of strati over a spherical source, there appears a power-law part in the reprocessed spectra, while there appears a single peak in the case of a spherical configuration of strati. In the case of a plane configuration over a disc source, on the other hand, there also appears a power-law part, but its slope is different from that for a spherical source. Finally, the observational spectra of strati over a standard accretion disc are also calculated. Since the accretion disc radiates a multicolour spectrum, and it is differently diluted and reprocessed at the different radius in the stratus, the expected spectra generally show complicated profiles, which depend on the optical depth, configuration and inclination. © 2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society.

Oda H.,Osaka Kyoiku University
Textile Research Journal | Year: 2011

The textiles for protection against harmful UV radiation have become the focus of great interest in the present time. However, not all apparel is well-protected against UV light. Therefore, the application and improvement of UV absorbers for sun protective fabrics is being sought.In this study, various benzophenone UV absorbers containing benzotoriazolyl groups were prepared, and the Ultraviolet Protection Factors (UPF) and improving the light fastness of dyes was examined. A series of hydroxybenzophenones bearing a built-in benzotriazole moiety showed a very high UPF, and played a very important role in the improvement of light fastness of dyes. It was found that 2,2',4,4'-tetrahydroxy-5,5'-dibenzotriazolylbenzophenonesulfonic acid or the methyl derivative shows very high UPF, and plays an important role in improving the light fastness of dyes. It was further demonstrated that the combined use of these UV absorbers and singlet oxygen quencher, NTS (Nickel p-toluenesulfonate), can be applied as effective stabilizers against the photofading of dyes. © The Author(s) 2011.

Kiwata H.,Osaka Kyoiku University
Physica A: Statistical Mechanics and its Applications | Year: 2012

We consider image restoration by Bayes' formula and investigate the relationship between an image and a prior probability from the following two viewpoints: hyperparameter estimation and the accuracy of a restored image. The Q-Ising model is adopted as a prior probability in Bayes' formula. Not the Q-Ising energy, but the Potts energy plays an important role in the hyperparameter estimation. From the viewpoint of the hyperparameter estimation, the relationship between a natural image and a prior probability is characterized through the Potts energy and magnetization of an image. The Potts energy and magnetization of an image are defined by a set of pixels' state of an image. The closer to the average Potts energy and magnetization over a prior probability the Potts energy and magnetization of a natural image is, the closer to the true value of a hyperparameter the estimated value of a hyperparameter from a degraded image is. For the accuracy of a restored image, the image which has a smaller Q-Ising energy is better restored by Bayes' formula composed of the Q-Ising prior. The consideration for the relationship between an image and a prior probability is expected to be valid for a more complicated prior probability. © 2011 Elsevier B.V. All rights reserved.

Fukue J.,Osaka Kyoiku University
Monthly Notices of the Royal Astronomical Society | Year: 2013

Radiative transfer in a geometrically thin stratus (i.e. a sheet-like gaseous cloud with finite optical depth), floating above a luminous source such as an accretion disc, is examined under the non-grey frequency-dependent treatment. Emergent intensity and other radiative quantities are analytically obtained under the Eddington approximation for two typical cases: purely scattering and local thermodynamic equilibrium (LTE). In the purely scattering case without emission, the mean intensity is a linear function of the optical depth, the flux is constant, and the emergent intensity has angle dependency as a result of scattering. In this case, the emergent spectra have the same profile as those of the central source. In the LTE case, however, there appears to be a reprocessed thermal component in addition to a scattered one. As a result, the behaviour of the mean intensity and flux depends on the fraction of the thermal component. The emergent intensity shows the usual limb-darkening or limb-brightening effect, as well as the scattering effect. In this case, the emergent spectra have thermal and scattering components, and show complicated profiles. We also show illustrative examples of a stratus floating over a plane flat source: observational images and modified spectra due to reprocessing. © 2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society.

Tsujioka T.,Osaka Kyoiku University
Journal of Materials Chemistry | Year: 2011

In organic electronics, organic crystals are essential materials, and metal deposition on organic surfaces is an important process. We report light-controlled metal deposition on photosensitive organic crystals. Light irradiation to the photosensitive diarylethene (DAE) crystal surface generated another isomer in the crystal lattice and made the surface soft, which caused the Mg-undeposition effect. The light-controlled selective Mg deposition can be applied to fine metal patterning by laser scanning and maskless evaporation. Fine parallel and grid Mg patterning on the DAE crystal surface are demonstrated successfully. This method is promising for fine electrode patterning of various electronics devices with an organic crystal. © 2011 The Royal Society of Chemistry.

Tsujioka T.,Osaka Kyoiku University
Soft Matter | Year: 2013

We report a novel function of a polymer coffee-ring surface called metal-vapor deposition modulation where metal-vapor atoms are deposited on the center of the polymer coffee-ring surface using vacuum evaporation but not on the ring-shaped areas at the edge. The essential factor of the metal-deposition modulation is the difference of polymer chain mobility between the center and the ring. In the ring, the solvent evaporation process produces large spaces among surface polymer chains, resulting in high mobility of polymer chains. The desorption of metal vapor atoms from the surface was caused by the high mobility of the polymer chains. This result not only provides new knowledge about the fundamentals of a polymer surface but also suggests a novel technology for engineering and industrial fields using metallic coating technology on polymer surfaces. © 2013 The Royal Society of Chemistry.

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