縮環芳香環積層分子の合成とその機能化

京都大学0048新制・課程博士博士(工学)甲第19006号工博第4048号新制||工||1623(附属図書館)31957京都大学大学院工学研究科高分子化学専攻(主査)教授 中條 善樹, 教授 赤木 和夫, 教授 秋吉 一成学位規則第4条第1項該当Doctor of Philosophy (Engineering)Kyoto UniversityDGA

Coherent control of a flux qubit by phase-shifted resonant microwave pulses

The quantum state of a flux qubit was successfully pulse-controlled by using a resonant microwave. We observed Ramsey fringes by applying a pair of phase-shifted pi/2 microwave pulses without introducing detuning. With this method, the qubit state can be rotated on an arbitrary axis in the x-y plane of the Bloch sphere in a rotating frame. We obtained a qubit signal from a coherent oscillation with an angular velocity of up to 2pi*11.4 Grad/s. In combination with Rabi pulses, this method enables us to achieve full control of single qubit operation. It also offers the possibility of orders of magnitude increases in the speed of the arbitrary unitary gate operation.Comment: 3 pages, 3 figure

THE CORRELATIONS BETWEEN RECENT HISTORIES OF LOW BACK PAIN AND TRUNK STRENGTHS IN COLLEGIATE JUDOISTS

High occurrence of low back pain (LBP) in competitive judoists has been well documented. Since spine stability deficits could be associated with an incidence of low back injury, sufficient trunk strength is required for LBP prevention. Some studies have indicated that trunk strength weakness may be one of the risk factor for LBP in non-athlete population, yet there is little consensus on the correlation between LBP and trunk strength in competitive judoists. Therefore, the purpose of this study is to demonstrate the correlations between LBP experience and isometric strength of trunk flexion, extension and lateral flexion in collegiate judoists

A Visual Learning Tool for Database Operation

In this paper we propose sAccess, a web-based learning tool for database education. It focuses on introductory computer science education for high school and college. sAccess has an easy-to-use query interface for manipulating databases. Using this tool, students can learn the fundamental knowl- edge of relational database practically. In this paper, we will explain the overview of design and implementation of sAccess

A locally-induced increase in intracellular Ca2+ propagates cell-to-cell in the presence of plasma membrane Ca2+ ATPase inhibitors in non-excitable cells

AbstractIntercellular Ca2+ waves are commonly observed in many cell types. In non-excitable cells, intercellular Ca2+ waves are mediated by gap junctional diffusion of a Ca2+ mobilizing messenger such as IP3. Since Ca2+ is heavily buffered in the cytosolic environment, it has been hypothesized that the contribution of the diffusion of Ca2+ to intercellular Ca2+ waves is limited. Here, we report that in the presence of plasma membrane Ca2+ ATPase inhibitors, locally-released Ca2+ from the flash-photolysis of caged-Ca2+ appeared to induce further Ca2+ release and were propagated from one cell to another, indicating that Ca2+ was self-amplified to mediate intercellular Ca2+ waves. Our findings support the notion that non-excitable cells can establish a highly excitable medium to communicate local responses with distant cells

Yukawa Hierarchy Transfer Based on Superconformal Dynamics and Geometrical Realization in String Models

We propose a scenario that leads to hierarchical Yukawa couplings and degenerate sfermion masses at the same time, in the context of extra-dimensional models, which can be naturally embedded in a wide class of string models. The hierarchy of Yukawa couplings and degeneracy of sfermion masses can be realized thanks to superconformal gauge dynamics. The sfermion mass degeneracy is guaranteed by taking the superconformal fixed point to be family independent. In our scenario, the origin of Yukawa hierarchy is attributed to geometry of compactified dimensions and the consequent volume dependence of gauge couplings in the superconformal sectors. The difference in these gauge couplings is dynamically transferred to the hierarchy of the Yukawa couplings. Thus, our scenario combines a new dynamical approach and the conventional geometrical approach to the supersymmetric flavor problem.Comment: 12 pages, latex, no figur

Searching for gravitational wave echoes from black hole binary events in the third observing run of LIGO, Virgo, and KAGRA collaborations

Gravitational wave echo signals have been proposed as evidence for the modification of the spacetime structure near the classical event horizon. These signals are expected to occur after the mergers of compact binaries as a sequence of weak pulse-like signals. Some studies have shown evidence of the echo signals from several binary black hole merger events. On the other hand, the other studies have shown the low significance of such signals from various events in the first, second and third observing runs (O1, O2 and O3). Our previous study also shows the low significance of echo signals from events in O1 and O2, though, we observe that more than half of the events have p-value smaller than 0.1 when the simply modeled waveform is used for the analysis. Since there are only nine events appropriate for this analysis in O1 and O2, it is necessary to analyze more events to evaluate the significance statistically. In this study, we search for echo signals from binary black hole events observed during O3 operated by LIGO, Virgo and KAGRA collaborations. We perform the template-based search by using two different models for echo signal templates: simply modeled one and physically motivated one. Our results show that the distributions of p-values for all events analyzed in this study are consistent with the noise distribution. This means that no significant echo signals are found for both models from O3 events.Comment: 11 page