Random connected circuit : A case of simulation used transisters

An arrester for electric power system which protects the surge voltage due to lightning discharge etc. has a nonlinear characteristics. There are many phenomenological theories about it, but not fundamental ones. The sintered arrester consists of huge numbers of fine semi-conductingparticles. One particle of them contacts with the neighbor particles at one or few points. It results in huge numbers of random connected circuit of semi-conducting particles.The nonlinear characteristics is expected to arise from such huge numbers of random connections. A simulation of random connected circuit with many transistors is carried out. Its circuit is connected by following severe rules controlled with random numbers. It is found from preliminary simulations that random connected circuits with transistors result in cut off states in any stage and the stages agree with the results from the analysis of probability theory. A certain result, therefore, can not yet get for the nonlinear characteristics.雷放電などによるサージ電圧を防止する電力用避雷器は非線形特性をもつ。この特性に関して現象論的な理論は多くあるが，基本的なものは無い。焼結避雷器は莫大な数の半導体微粒子からなっており，それらの1粒子は周りの粒子と一点または数点で接触，結合している。その結果として，巨大にランダム結合した半導体微粒子の回路を形成している。非線形特性はこの巨大なランダム結合から起こるものと推測される。それ故，トランジスターをランダムに結合した回路を用いてこのシュミレーションを行った。これから，トランジスターを用いたランダム結合回路ではどこかの段で必ずカットオフになり，しかも，この段数は確率理論の解折からの結果と一致することが分かった。しかしながら非線形特性を示す確かな結果はまだ得られなかった

Aggressive angiomyxoma in the scrotum: a case report

A case of aggressive angiomyxoma occurring in the scrotum is reported. A 57-year-old Japanese man presented with a 2-year history of non-tender soft mass in the scrotum. Computed tomography and magnetic resonance imaging revealed a well-defined mass 8 cm in diameter extending from the medial aspect of the left ischium. Angiography revealed faint vascularity fed by the left internal pudendal artery. Excision was performed by a scrotal approach, and histological examination confirmed an aggressive angiomyxoma. The patient showed no recurrence at 3 months follow-up

Walking pattern of a multiped robot by analyzing the movement of a insect

The method of a determination of walking pattern of a multiped robot with six legs was considered. The three processes: 1) Matrix expression of the walking on the base of kinematics. 2) Observation of the movement of insects. 3) making of the walking pattern of a multiped robot, were carried. The characteristic and the time dependence of motion of each leg of the insect were analyzed and the non-dimension walking patterns were determined from these processes. It is found as the fundamental characteristic of the multipde (6 legs) robot walking that the functions of front legs, middle legs and rear legs are to pull the body ahead, to support it and to push it respectively.6足の多足ロボットの歩行パターンの決定方法について考察を行った。この考察は， 3 つの手順で行った。 1) 運動学に基づく歩行の行列表現。 2) 昆虫の運動の観測。 3) 多足ロボットの歩行パターンを求めるというこれらの手順から， 昆虫のそれぞれの足の運動の特徴と運動の時間変化について解析し， 無次元化した歩行パターンを決定した。多足(6足)ロボットの歩行の基礎的な特徴として，それぞれ前足の働きは体を引っ張り，中足は体を支え，後足は，体を押し進めるようにしていることが分かった

Fundamental experiments on flashover of a porcelain insulator with AC high voltage

Follwing previous papers, flashover characteristics of a porcelain insulator by applying AC high voltage are fundamentally examined. We get the many protections on flashover of a porcelain insulator into the guiding principle from many experiences of high voltage experiments. The principle consists of the following three items: 1) divide the electric line of force into small length as possible. 2) concentrate the line within high insulation materials by a specific dielectric constant control. 3) trap the line with the shape of high insulation materials. Experiments belonging to two categolies are carried out. One is of division of the line by several layers of dishes. Another is of concentration of the line with the high dielectric materials. It is found from the fundamental flashover experiments that there are a optimumdistannce for the divide the eletricline of force into small length and a certain curve which represents flashover voltage per unit diameter of a porcelain insulator as a function of the distance of two electrodes and our guiding principle on the protection of flashover of a porcelain insulator is certain to be available.前報告に引き続いて，交流高電圧による碍子の閃絡破壊特性を基本的に調べた。我々は多くの高電圧に関する実験の経験から得た数多くの碍子の閃絡破壊防止法を今後の指針にまとめた。この指針は次の3項目からなっている; 1) 電気力線を可能な限り分断する。 2) 電気力線が耐圧の高い材料に集中するように材料の誘電率制御を行う。 3) 電気力線をトラップするような形状をとる。 2つの範疇に属する実験がなされた。一つは洋皿を重ね，電気力線を分断するものであれもう一つは高誘電材料で電気力線を集中させるものである。閃絡破壊の基礎実験から，電気力線を小さく分断するのにも最適な距離があること，および，碍子の単位直径あたりの閃絡破壊電圧は電極間距離の関数として一つの曲線で表されることが分かった。そして，我々のまとめた碍子の閃絡破壊防止に関する指針は確かに使うことが可能である

Heat transfer coefficiency and radiation efficiency of high electric current bus

Recently, electric power demand goes on increasing. It is necessary to more electric substations and small cubicles. It is also wanted to compact gears and substations. This situation results in the narrow distance arrangement of the current buses and the handling of the high current and high temperature of the buses. Since the temperature rise of the bus is due to many heat transfer factors in the vicinity of the bus surface, it is analysed inclusively in this paper. From the engineering aspect, that is, the design aspect, it is important to know two fundamental values of heat transfer coefficiency and radiation efficiency necessary to decide the final temperature of the bus. The temperature are known from the method of phase plane of the nonlinear differential equation on the temperature rise including the radiation loss with their values. The calculated temperature is consisted with the experimental ones.最近，電力需要が増加してきており，より多くの変電設備やキュービクルが必要である。これはまた，コンパクトな装置や変電設備を求めている。このような事情から，狭い間隔での電流母線の配置やこれら母線を大電流で，しかも高い温度で取り扱わなくてはならなくなってきている。母線の温度上昇はその表面周辺での多くの熱伝達因子によるが，この論文では，この温度上昇を総括的に解析した。工学的すなわち設計の立場から，母線の最終温度を決める基本的な2つの値，熱伝達係数と放射効率を知ることは重要である。この温度はこれらの値を用いて放射損失の項をもつ温度上昇に関する非線形微分方程式を位相平面の方法で知ることが出来る。この計算で求めた値と実験値とは一致を見た

A Search for CO(J=3-2) Emission from the Host Galaxy of GRB 980425 with the Atacama Submillimeter Telescope Experiment

We report on a deep search for CO(J=3-2) line emission from the host galaxy of GRB 980425 with the Atacama Submillimeter Telescope Experiment (ASTE). We observed five points of the galaxy covering the entire region. After combining all of the spectra, we obtained a global spectrum with the rms noise level of 3.3 mK in T_mb scale at a velocity resolution of 10 km s^-1. No significant emission was detected, though we find a marginal emission feature in the velocity range corresponding to the redshift of the galaxy. We derive 3 sigma upper limits on the global properties: the velocity-integrated CO(3-2) intensity of I_CO(3-2) < 0.26 K km s^-1 by adopting a velocity width of 67 km s^-1; the H_2 column density of N(H_2) < 3 x 10^20 cm^-2; the molecular gas mass of M(H_2) < 3 x 10^8 M_sun, by assuming a CO line luminosity to H_2 molecular gas mass conversion factor of X_CO = 5.0 x 10^20 cm^-2 (K km s^-1)^-1; and the star formation rate of SFR < 0.1 M_sun yr^-1, based on the Schmidt law. The SFR is consistent with the previous results of H_alpha and mid-IR observations, thereby suggesting that there is no significant obscured star formation in the host galaxy of GRB 980425. This result implies that there is a variety of GRB hosts with regard to the presence of obscured star formation.Comment: 7 pages, 4 figure

Clinical statistics on the patients operated at the Department of Urology, Kinki University Hospital during three years from 1987 to 1989

A statistic survey was made on the patients undergoing operations between January, 1987 and December, 1989