Comparison of two-color methods based on wavelength and adjacent pulse repetition interval length

This paper describes the characteristics of a two-color method based on the adjacent pulse repetition interval length (APRIL), which functions as a length unit for femtosecond optical frequency combs (FOFCs), and compares the results to the wavelength-based two-color method. The wavelength-based two-color method can eliminate the inhomogeneous disturbance of effects caused by the phase refractive index; therefore, the APRIL-based two-color method can eliminate the air turbulence of errors induced by the group refractive index. Our numerical analysis of the APRIL-based two-color method will contribute to the pulse-laser-based two-color method, which secures traceability to the definition of the meter via APRIL

Using dispersion-induced group delay to solve the integer ambiguity problem: a theoretical analysis

This paper describes a novel approach for solving the integer ambiguity problem when the adjacent pulse repetition interval length (APRIL) from a femtosecond optical frequency comb (FOFC) is used as a length scale. This approach is inspired by the two-color method, which indicates that there is a one-to-one relationship between the integer part of the APRIL and the group delay distance between the two different wavelengths. Accordingly, we numerically investigate the possibility of using dispersion-induced group delay to solve the integer ambiguity problem. The results of theoretical analyses and numerical investigations demonstrate the feasibility of the proposed method. Our results should contribute toward the further development of APRIL-based length measurement methods

李喬文学と“台湾意識”の形成 : フォークナー、安部公房の受容と“歴史素材小説”創作をめぐって

学位の種別: 課程博士審査委員会委員 : （主査）東京大学教授 藤井 省三, 東京大学教授 松田 康博, 横浜国立大学教授 垂水 千恵, 広島大学教授 三木 直大, 日本大学教授 山口 守University of Tokyo(東京大学

Numerical study on uncertainty of two-color method

The two-color method is one of the commonly used approaches for converting a length measured in air to a length in vacuum to eliminate the influence of the refractive index of air. However, the error of the technique is not well known. We investigate this uncertainty based on a generalized expression of the two-color method proposed in this paper and using numerical simulations. Numerical calculations reveal the change of the error with temperature, air pressure, and wavelengths. These characteristics can be used to optimize the two-color method

Comparative Biology of the Pentraxin Protein Family: Evolutionarily Conserved Component of Innate Immune System

The immune system is based on the actions of the collection of specialized immune defense cells and their secreted proteins and peptides that defend the host against infection by parasites. Parasites are organisms that live part or all of their lives in close physical association with the host and extract nutrients from the host and, by releasing toxins and virulence factors, cause disease with the potential for injury and premature death of that host. Parasites of the metazoa can be viruses, eubacteria, fungi, protozoans, and other metazoans. The immune system operates to kill or eliminate parasites and eliminate or detoxify their toxins and virulence factors. Although some of the elements of immune systems are specific to a particular phylum of metazoans, others show extensive evolutionary conservation, being present in several or all major phyla of the metazoa. The pentraxins display this latter character in their roles in immune defense. Pentraxins have been documented in vertebrates, nonvertebrate chordates, arthropods, and mollusks and may be present in other taxa of metazoans. Presumably the pentraxins appeared early in the evolution of metazoa, prior to their evolutionary divergence in the Precambrian epoch into many phyla present today, and have been preserved for the 542 million years since that explosive evolutionary radiation. The fidelity with which these phyla have preserved the pentraxins suggests that the functions of these proteins are important for survival of the members of these diverse taxa of animals