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STUDY OF A QUARTER-WAVE METALLIC PLATE COMPOSED OF PERIODIC HOLES OPERATING OVER THE COMMUNICATION BAND
Get PDFA metallic quarter-wave plate composed of periodic crossed-slots sandwiched with dielectric substrates is analyzed using the finite-difference time-domain method with the periodic boundary condition. A slight difference in the slot length in the x and y directions leads to a desirable phase difference of 90° in the target operation band (O-band at communication wavelengths). The crossed-slot type is found to be superior in terms of the polarization conversion characteristics, although a rectangular aperture provides higher transmittance than a crossed-slot type
Optical observations of dynamics of atoms generated by laser ablation in air, vacuum and liquid
Get PDFWe have been studying impurity atoms in superfluid helium (He II) using laser spectroscopic method. It is known that a depletion called “atomic-bubble” is formed when atoms are immersed into He II. Laser ablation is one of the effective methods to introduce atoms in He II, however, this process also causes vaporization of liquid helium due to the sudden transition of solid sample to high-temperature and high-pressure vapor. It is considered that it takes some time for atoms to form bubble states. Thus, we expect to observe time delay of atoms to get into He II.As the first step of the study above described, in this work, we aim to investigate dynamics of atoms optically by observing laser-induced fluorescence from atoms generated by laser ablation method in air, vacuum and liquid nitrogen
A Study on Dual-task VAE with Weibull expansion for RUL estimation and application to Bearing data
Get PDFRemaining Useful Life (RUL) is one of the most fundamental assessment measures in reliability engineering. Although several widely-used public datasets have information on failure times, they do not have information on RUL. As one of the simple methodologies, we can consider a linear degradation concerning the difference between the future failure time and the current time. However, since it is not always the case that such a linear degradation occurs, then we need to generate complex teacher labels incorporating the detection of changing points in the degradation states. In one of the previous studies, one proposed a failure prediction model that took into account the degradation states and achieved some improvement in prediction accuracy. However, this model sometimes does not perform well; for example, it cannot be adapted to specific tagging methods. Therefore we propose Dual-task VAE incorporating Weibull distribution as a prediction model which does not depend on the tagging methods. A numerical example with an actual data set is also presented to show the performance of our model
STUDIES ON THE CONTROLLING EFFECTS ON BOTH RICE BAKANAE AND RICE BLAST DISEASES BY INOCULATION OF ARBUSCULAR MYCORRHIZAL FUNGI
Get PDFIn this study, I focused on the fact that mycorrhizal fungi can promote plant growth and improve disease resistance by establishing a symbiotic relationship with plants. Rice is one of the major crops in Japan with few types of microorganism pesticides that currently can be used. The goal of this study was to contribute to the improvement of cultivation techniques for rice with reduced use of pesticides. In this study, I investigated the efficacy of mycorrhizal inoculation in controlling rice bakanae disease and rice blast disease. In addition, I measured the expression levels of rice disease defense-related genes in order to explore the factors that contributed to the efficacy of mycorrhizal fungi in controlling these diseases. The results showed that inoculation with mycorrhizal fungi was effective in controlling rice bakanae disease and rice blast disease. It was also suggested that rice secrete chitinase by sensing chitin, the main component of mycorrhizal cell walls, in the root zone induced defense response and that the signal is transmitted to the aboveground zone via salicylic acid resulting in aboveground control of the fungus
Special Issue : Reevaluating the Socialization of Long-Term Care : From the Perspectives of Gender, Care, and Singleness : Introduction to the Special Issue
Get PDF<Book Reviews> KATO Kiyofumi, The Investigation on Japanese Repatriation : the Forgotten Japanese Empire in the Postwar Era
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