9・11以後のアメリカ外交と安全保障に関する一考察

2008年度名古屋大学学生論文コンテスト優秀賞受賞othe

RFI-MBE法を用いたSiC基板上へのInNエピタキシャル層およびInN/InGaN量子井戸の成長

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Automatic image analysis of an archery arrow in free flight using high-speed video cameras

Archery at the Olympic games is a competition that hits a target 70 m away. The shooting performance of bows has improved, and athletes are required to have high accuracy shooting at the 10-point zone with a diameter of 122 mm. It is important to know the flight trajectory and attitude of arrow shot to improve the competitive ability. For this purpose, it is necessary to analyze an image of each arrow shot by a high-speed video camera with high accuracy. In this study, an automatic image analysis software for analyzing the velocity and attitude of archery arrows in free flight was developed. In order to confirm the reliability of the analysis results, we measured the velocity and attitude of arrows launched at various initial velocities by a shooting machine using compressed air, and also the arrows shot from bows by an athlete and a robot. Consistency between the results of the conventional visual analysis and those of the automatic image analysis was confirmed. The analysis time was reduced to 1/10 or less. Based on the information obtained from the automatic image analysis, it became possible to examine the flight characteristics of arrow shots, such as the variations in the initial arrow velocity, the initial angle of attack and the velocity decay rate. Knowing these flight characteristics on site will contribute to the optimization of arrow parts composition and the improvement of the athletes’ competitive ability.journal articl

Study of Time-Dependent CP Violation in B0→J/ψπ0 Decays

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工学部 情報科学基礎 1コマコース(平成19年度)

application/pdf平成19年度に実施した工学部での情報検索入門講習会（1コマコース）41learning objec

Temperature Dependence of Magnetically Active Charge Excitations in Magnetite across the Verwey Transition

We study the electronic structure of bulk single crystals and epitaxial films of Fe3O4. Fe 2p core level spectra show clear differences between hard x-ray (HAX) and soft x-ray photoemission spectroscopy (PES). The bulk-sensitive spectra exhibit temperature (T) dependence across the Verwey transition, which is missing in the surface-sensitive spectra. By using an extended impurity Anderson full-multiplet model-and in contrast to an earlier peak assignment-we show that the two distinct Fe species (A and B site) and the charge modulation at the B site are responsible for the newly found double peaks in the main peak above TV and its T-dependent evolution. The Fe 2p HAXPES spectra show a clear magnetic circular dichroism (MCD) in the metallic phase of magnetized 100-nm-thick films. The model calculations also reproduce the MCD and identify the contributions from magnetically distinct A and B sites. Valence band HAXPES shows a finite density of states at EF for the polaronic half metal with a remnant order above TV and a clear gap formation below TV. The results indicate that the Verwey transition is driven by changes in the strongly correlated and magnetically active B-site electronic states, consistent with resistivity and optical spectra.journal articl