Field Analysis of SF(6) Gas Insulated Cables and Its Application to Spacer Design

This paper describes the spacer design for SF(6) gas insulated cables. The maximum electric stress within the cable is calculated by a numerical method, and it is recognized that the breakdown voltage depends linearly on the calculated values. Moreover, the effects of varying the shape of the spacer are made clear in this study for designing an optimum spacer

Temperature-Dependent Cycloidal Magnetic Structure in GdRu2_{2}Al10_{10} Studied by Resonant X-ray Diffraction

We have performed resonant X-ray diffraction experiments on the antiferromagnet GdRu$_{2}$Al$_{10}$ and have clarified that the magnetic structure in the ordered state is cycloidal with the moments lying in the $bc$ plane and propagating along the $b$ axis. The propagation vector shows a similar temperature dependence to the magnetic order parameter, which can be interpreted as being associated with the gap opening in the conduction band and the resultant change in the magnetic exchange interaction. Although the $S=7/2$ state of Gd is almost isotropic, the moments show slight preferential ordering along the $b$ axis. The $c$ axis component in the cycloid develops with decreasing temperature through a tiny transition in the ordered phase. We also show that the scattering involves the $\sigma$-$\sigma'$ process, which is forbidden in normal $E1$-$E1$ resonance of magnetic dipole origin. We discuss the possibility of the $E1$-$E2$ resonance originating from a toroidal moment due to the lack of inversion symmetry at the Gd site. The spin-flop transition in a magnetic field is also described in detail.Comment: 8 pages, 11 figures, accepted for publication in J. Phys. Soc. Jp

A Method of Automatic Washing for Salt Contaminated Insulators

Described in this paper is a method of automatic washing for salt contaminated insulators. An average value of leakage current through the surface of the pilot insulator in a duration is measured, for this is a function of the quantity of salt adhered and its moisture content. In each cycle, the program signals give one by one the instructions on a start and an end of the integration of leakage current, a detection of the integrated value, a stop of the washing device and a reset of the integrator. The integrator consists of RC circuit and the main detecting part consists of the thyristor whose firing gate voltage is used as a reference value. If the integrator output rises above the firing gate voltage, the pulse signals are made in the signal conversion part at the same time that the thyristor turns on, which are distributed to the pump motor or the electromagnetic valve. Then the insulators on hot-line are washed all together in the appointed duration. Finally, by the various experiments this method was proved to have enough accuracy and reliability in practical use. The conclusions are summarized as follows. (1) An average value of leakage current is justified to be the detecting variable. (2) The RC circuit used as the integrator is proved to be easy in maintenance. (3) Because of the fairly short duration of the detecting action, the integrator is kept in a sufficiently safe condition under expected environment

An Asynchronous Delay Line for PAM Signal

An asynchronous delay line for PAM signal having controlled delay capability is proposed. The delay line in a cascaded chain of identical memory cells. Each sample of the sequence of the input PAM signals passes or is shifted in particular cell depending on whether the succeeding cell is empty or not. A cell is composed of two memory capacitors with the peripheral control circuits. In this paper, especially, an example of the circuit for cell is shown and its several characteristics are discussed. At the end, some experimental results are given

Tooth Mobility Measurement of Dental Implants

The use of dental implants has increased together with increases in the human life span and it has become an imperative subject for dentists to familiarize themselves with this treatment modality. Unfortunately, there has been no practical and quantitative method for in vivo evaluation of the stability of dental implants. In the tooth mobility examination, the tactile sense of natural teeth is different from that of dental implants. The authors have developed an automatic diagnosis system of tooth mobility for clinical use. The biomechanical mobility of peri-implantium is measured with a pseudo-random vibration, from which the viscoelasticity c1, c2, k of peri-implantium is obtained. The diagnosis system has been applied to the quantitative evaluation of the stability of implants : endodontics endosseous implants (titanium pin), endosseous implants (Bioceram). It has also been applied to the evaluation of the long-term prognoses of dental implantation (Bioceram) and the examination of Intramobile implant (IMZ), and the satisfactory results have been obtained

Genetic Analysis the of Registered Japanese Black Cattle in Okayama Prefecture : I. The Rate of Genetie Contribution and Inbreeding Coefficient

岡山県における黒毛和種高等登録牛の繁殖構造を明らかにするために,1951年から1974年までの24年間に高等登録を受けた雄牛51頭,雌牛635頭より抽出した323頭を用い,これらの牛群に対する特定種雄牛あるいは特定種雌牛の遺伝的寄与率,および,これらの牛群に対する岡山県和牛試験場の種雄牛群の遺伝的寄与率をWIENERの方法により推定した. また,高等登録牛群の近交係数についても検討した. 得られた結果は次の通りである. 1)高等登録に対し遺伝的に大きく貢献した種雄牛は,第六清国,第四下前,第六荒神,第三中尾,および第十神福であった. 2)これらの種雄牛はいずれも,第十三花山の亜系と兵庫県から導入された種雄牛との間の系統間交配や戻し交配によって確立されたものであった. 3)岡山県和牛試験場の種雄牛群の高等登録牛群に対する遺伝的寄与率が年と共に増加したことは,本試験場が和牛の改良に大きく貢献していることを示すと考えられる. 4)黒毛和種高等登録牛群の近交係数は日本短角種,褐毛和種と比較してやや高い値を示した

魚類におけるヘッジホッグシグナル伝達経路の活性化機構の解析

学位の種別: 課程博士審査委員会委員 : (主査)東京大学教授 武田 洋幸, 東京大学教授 岡 良隆, 東京大学准教授 平良 眞規, 東京大学准教授 吉田 学, 東京大学准教授 近藤 真理子University of Tokyo(東京大学

Positive feedback regulation of fzd7 expression robustly shapes a steep Wnt gradient in Xenopus heart development, together with sFRP1 and heparan sulfate

Acknowledgements We thank Dr. Yukio Nakamura (Aberdeen University, UK; Present address: Repertoire Genesis Inc., Japan.) and Dr. Masanori Taira (Chuo University, Japan) for their help in initiating this project; Dr. Takehiko Nakamura (Seikagaku Corporation, Japan) for NAH46 antibody and hybridoma; Dr. Osamu Yoshie (Kindai University, Japan) for HepSS-1 hybridoma; Dr. Makoto Matsuyama (Shigei Medical Research Institute, Japan) for the contribution to the generation of NAH46 and HepSS-1 antibody from the hybridomas; Dr. Steven D. Aird for technical editing of the manuscript. This international collaboration was supported in part by Daiwa Anglo-Japanese Foundation (12969/13787 to T.Y., B.A., T.M., and S.H.); with additional research support in Japan from MEXT/JSPS KAKENHI (19K16138 to T.Y., 18K06244/21K06183 to T.Y. and T.M.); and in the United Kingdom from BHF (RG/18/8/33673 to S.H.) and BBSRC (BB/N021924/1; BB/M001695/1 to S.H.). S.H. was a Royal Society/Leverhulme Trust Senior Research Fellow (SRF\R1\191017).Peer reviewedPublisher PD