Gauge-Invariant Gravitational Wave Extraction from Coalescing Binary Neutron Stars

We report application of a method for extracting gravitational waves to three-dimensional numerical simulation on coalescing binary neutron stars. We found the extracted wave form includes the componets corresponding to the quadrupole part in the Newtonian potential of the background metric, if it is monitored at a position not far from the central stars. We present how to eliminate it.Comment: 6 pages, 5 figure

テフロクロノロジー ニヨル トクシマケン カミヤマチョウ ノ コウネ ジスベリ ヒガシオオクボ ジスベリ ノ ハッセイ ジキ ノ スイテイ

In this study，tephrochronological ages of the Koune Landslide and the Higashiohkubo Landslide in Kamiyama Town，Tokushima Prefecture，are estimated. The Koune Landslide is divided into two landslides; the Primary Koune Landslide and the Secondary Koune Landslide. The Primary Koune Landslide is cut by main scarp and moving mass of the Secondary Landslide. The Secondary Koune Landslide is overlain by the Kikai-Akahoya Tephra and re-sedimentation of the Aira-Tanzawa Tephra， suggesting that the landslide occurred primarily between 7.3 ka and 26-29 ka. Therefore， the Primary landslide is older than the Secondary one. The Higashiohkubo Landslide is not overlain by the Aira-Tanzawa Tephra，but the Kikai-Akahoya Tepahra, suggesting that the landslide occurred primarily between 7.3 ka and 26-29 ka

Complexation of F⁻ by Li⁺ and Mg²⁺ Ions as Inorganic Anion Acceptors in Lactone-Based Li⁺/F⁻ and Mg²⁺/F⁻ Hybrid Electrolytes for Fluoride Shuttle Batteries

The development of high-quality fluoride-ion transporting electrolytes is a crucial demand for fluoride shuttle batteries (FSBs). However, the uncontrolled chemical and electrochemical activities of fluoride ions narrow the available potential window, hindering the development of high-voltage FSB cells. We present a method for upgrading recently developed lactone-based liquid fluoride electrolytes by complexation of F⁻ with Li⁺ and Mg²⁺ ions. In the resultant Li⁺/F⁻ and Mg²⁺/F⁻ hybrid electrolytes, Li2F+ and MgF+ were the most probable soluble complexes, and the effective fluoride concentrations could reach ∼0.15 M along with excess Li⁺(Mg²⁺) ions. Unique interactions between F⁻ and Li⁺(Mg²⁺) were observed using ¹⁹F nuclear magnetic resonance spectroscopy. Li⁺(Mg²⁺) ions thus served as inorganic anion acceptors with ultimate redox stabilities to expand the negative potential window of the electrolytes to near −3 V vs SHE. The proposed complex formation was also supported by a conductometric titration method. We demonstrated the superior and versatile electrochemical performances of the Li⁺/F⁻ hybrid electrolyte, which enabled reversible charge/discharge reactions of various metal electrodes and composite electrodes in a wide range of redox series. Further, the Li⁺/F⁻ hybrid electrolyte opened valid new reaction paths for aluminum, making it a promising negative electrode in high-voltage FSB cells

Femtosecond-laser-encoded distributed-feedback color center laser in lithium fluoride single crystals

金沢大学教育学部A distributed-feedback (DFB) color-center laser was fabricated by the holographic encoding method using an infrared femtosecond (fs) laser. Laser active color centers, waveguide structures and permanent gratings were written deep in lithium fluoride (LiF) crystals. It was shown that a refractive index change estimated from a guide propagation method was approximately +1% at a wavelength of 633 nm. The results show that the fabricated DFB laser structure oscillates at room temperature

Occurrence of NADH-specific and NADH/NADPH-bispecific cytochrome £5 reductases in the ascidians, Styela plicata and Ciona intestinalis

P(論文)departmental bulletin pape

Results of the search for inspiraling compact star binaries from TAMA300's observation in 2000-2004

We analyze the data of TAMA300 detector to search for gravitational waves from inspiraling compact star binaries with masses of the component stars in the range 1-3Msolar. In this analysis, 2705 hours of data, taken during the years 2000-2004, are used for the event search. We combine the results of different observation runs, and obtained a single upper limit on the rate of the coalescence of compact binaries in our Galaxy of 20 per year at a 90% confidence level. In this upper limit, the effect of various systematic errors such like the uncertainty of the background estimation and the calibration of the detector's sensitivity are included.Comment: 8 pages, 4 Postscript figures, uses revtex4.sty The author list was correcte