Laser-interferometric Detectors for Gravitational Wave Background at 100 MHz : Detector Design and Sensitivity

Recently, observational searches for gravitational wave background (GWB) have developed and given direct and indirect constraints on the energy density of GWB in a broad range of frequencies. These constraints have already rejected some theoretical models of large GWB spectra. However, at 100 MHz, there is no strict upper limit from direct observation, though the indirect limit by He4 abundance due to big-bang nucleosynthesis exists. In this paper, we propose an experiment with laser interferometers searching GWB at 100 MHz. We considered three detector designs and evaluated the GW response functions of a single detector. As a result, we found that, at 100 MHz, the most sensitive detector is the design, a so-called synchronous recycling interferometer, which has better sensitivity than an ordinary Fabry-Perot Michelson interferometer by a factor of 3.3 at 100 MHz. We also give the best sensitivity achievable at 100 MHz with realistic experimental parameters.Comment: 20 pages, 8 figure

Laser-interferometric detectors for gravitational wave backgrounds at 100 MHz: Detector design and sensitivity

Recently, observational searches for gravitational wave background (GWB) have been developed and given direct and indirect constraints on the energy density of GWB in a broad range of frequencies. These constraints have already rejected some theoretical models of large GWB spectra. However, at 100 MHz, there is no strict upper limit from direct observation, though the indirect limit by 2He abundance due to big-bang nucleosynthesis exists. In this paper, we propose an experiment with laser interferometers searching GWB at 100 MHz. We considered three detector designs and evaluated the GW response functions of a single detector. As a result, we found that, at 100 MHz, the most sensitive detector is the design, a so-called synchronous recycling interferometer, which has better sensitivity than an ordinary Fabry-Perot Michelson interferometer by a factor of 3.3 at 100 MHz. When we select the arm length of 0.75 m and realistic optical parameters, the best sensitivity achievable is h ≈ 7.8 ×10^{-21} Hz^{-1/2} at 100 MHz with bandwidth ～2 kHz.journal articl

平坦化CMPにおけるパッドドレッシングに関する研究

The various pad surface treatments were evaluated to clarify dominant factors on a pad surface to get removal rate on CMP(Chemical Mechanical Polishing). On evaluating the dominant surface' factors, pad surface recovery without grinding removal of pad surface was tried using a no-conditioning pad. After eliminating the by-products involved in the pad surface, recovery ratio on removal rate became 31% at most, which indicated that the by-products clogging in the pad surface was not a dominant factor to inhibit removal rate. Not grinding the surface but scraping the surface was valid for effective surface recovery to get removal rate. In this study, a noble pad conditioner was proposed from their results. The developed conditioner, which is the scraping brush conditioner, makes use of deflective deformation in order to apply constant contact force against height variation of pad surface. Consequently, it was demonstrated that the developed conditioner was applicable on surface reference conditioning on CMP without the stick-slip motion that occurs on the traditional conditioner.textapplication/pdfdepartmental bulletin pape

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

journal articl

Moodleを活用した図書館情報リテラシー講習会 : －インタラクティブ&アトラクティブな講習会を目指して－

application/pdf三重大学高等教育創造開発センター主催Moodle学習会 / Moodleのいろいろな使い方！発表用資料8ニッチ戦略による「役に立つ」図書館情報リテラシー講習会の展開学生さんの段階に応じた情報リテラシー講習会の展開（平成13年度～）Moodle前後 : そのまま載せ換えMoodle活用例Moodleを活用するメリット－1Moodleを活用するメリット－2これからMoodleでやってみたいことconference objec

Effects of a body manipulation of Japanese martial arts on interpersonal correlation of postural sway

This study aimed to investigate the nature of a specific body manipulation named Suichoku-Ririku (SR) in Japanese martial arts. SR is regarded as a method to change the way of stance and to distort the balance control of the opponent, but its nature and mechanism are unknown. In the present study, we attempted to determine the effect of SR in the cases that a person stood alone (Expt. 1) and that two persons stood in contact (Expt. 2). We compared several center of pressure (COP) measures between the normal stance and SR stance conditions. When participants stood independently (Expt. 1), the COP path length, standard deviation of COP velocity and permutation entropy of the COP increased with the SR stance, which suggested that the SR maneuver destabilized a quiet stance. When two participants stood (with normal stance) in contact by wrist-holding or by a light touch (Expt. 2), their COP motions were correlated with each other, as previously reported. When one of the participants took the SR maneuver, their correlation and mutual information were maintained, denying the view that SR would diminish the interpersonal correlation of body sway. On the other hand, a fluctuation in the COP increased only for the participant taking the SR maneuver, and not for the other participant. This asymmetric effect of the SR maneuver between two participants, irrespective of maintained mutual correlation, suggest that the relationship between balance controls of two participants was partly disrupted. We discuss possible mechanisms for the present results

Interaction of dimeric horse cytochrome c with cyanide ion

We have previously shown that methionine-heme iron coordination is perturbed in domain-swapped dimeric horse cytochrome c. To gain insight into the effect of methionine dissociation in dimeric cytochrome c, we investigated its interaction with cyanide ion. We found that the Soret and Q bands of oxidized dimeric cytochrome c at 406.5 and 529 nm redshift to 413 and 536 nm, respectively, on addition of 1 mM cyanide ion. The binding constant of dimeric cytochrome c and cyanide ion was obtained as 2.5 × 104 M-1. The Fe-CN and C-N stretching (ν Fe-CN and ν CN) resonance Raman bands of CN--bound dimeric cytochrome c were observed at 443 and 2,126 cm-1, respectively. The ν Fe-CN frequency of dimeric cytochrome c was relatively low compared with that of other CN--bound heme proteins, and a relatively strong coupling between the Fe-C-N bending and porphyrin vibrations was observed in the 350-450-cm-1 region. The low ν Fe-CN frequency suggests weaker binding of the cyanide ion to dimeric cytochrome c compared with other heme proteins possessing a distal heme cavity. Although the secondary structure of dimeric cytochrome c did not change on addition of cyanide ion according to circular dichroism measurements, the dimer dissociation rate at 45 °C increased from (8.9 ± 0.7) × 10-6 to (3.8 ± 0.2) × 10-5 s-1, with a decrease of about 2 °C in its dissociation temperature obtained with differential scanning calorimetry. The results show that diatomic ligands may bind to the heme iron of dimeric cytochrome c and affect its stability.journal articl