応用物理
Online ISSN : 2188-2290
Print ISSN : 0369-8009
ISSN-L : 0369-8009
26 巻 , 2 号
選択された号の論文の9件中1~9を表示しています
  • 今井 哲二
    1957 年 26 巻 2 号 p. 39-44
    発行日: 1957/02/10
    公開日: 2009/02/09
    ジャーナル フリー
    上に述べた大会的な研究会に纒めて発表されたもの以外に,一般の諸雑誌に個々に発表されたものも可なり見受けられる.その内容を項目別に分類してみると,多少分類に無理はあるが一応Table 4の如くなる.
    これらを通じて窺うことの出来る最近の研究動向は二つ或いは三つに大別して考えることができる.その一つはやはり中間層抵抗の問題をも含めた陰極基体金属に関するもので,特に陰極の寿命と直接結びつけて検討されている点が注目され,白金や所謂passive Niなども本格的に取上げられている.この問題に関連して陰極被覆中の遊離Baの定量や陰極物質の蒸発についても極めて注目すべき報告がなされている.
    もう一つは数年前に酸化物陰極における空隙伝導の存在が指摘されて以来これに関連する実験か非常に多くなり,この面からの酸化物陰極の物性論的性質の再検討という分野が大きくクローズアップされたことである.そしてこの面からの実用的発展として酸化物被覆の多孔質を利用した新しい増巾装置などの提案もみられる.
    それからもう一つ強いて分類を作ろうとするなら,それは酸化物陰極の使用限界の拡張への努力という分野が挙げられるであろう.これは広範に考えれば酸化物陰極に関するあらゆる研究の基盤をなすものとみることもできるが,ここでは特に目につくはつきりした2, 3の傾向としてHigh current densityへの努力と放電管への利用とを挙げることができよう.大電流密度を取り出すためには結局酸化物被覆の抵抗を小さくするということが第一に必要なことでありそのために種々の工夫が行われ,酸化物陰極ともいわゆるsintered cathodeともつかぬ様な中間的なものが現われ出している.又こういう行き方とは全然別な所謂Hollow陰極の出現も大いに注目されよう.
    放電管への利用の面では熱陰極としての利用は古くからなされているが放電管中での酸化物陰極の挙動については殆ど検討がなされていなかつたこがこういう面でのデーターも現われ出している.冷陰極としての検討は更に少くこの面での研究は全く緒についたばかりといえよう.
    以上三つの大きな分野のうちでこゝでは始めの二つについて項をわけて詳述し,第3の分野については特に, Hollow陰極だけを取り上げることにする.(以下次号)
  • 木村 博一
    1957 年 26 巻 2 号 p. 45-49
    発行日: 1957/02/10
    公開日: 2009/02/09
    ジャーナル フリー
    A new electron lens system of electron microscope excited with permanent magnets has been designed.
    It has variable magnification of over a wide range, a resolution of 30 A, and is possible to obtain diffraction patterns.
    The construction of magnetic circuits, characteristics of double gap lens and three stage lens system, variable method of focal length are described and micrographs taken by the instrument are shown.
  • 南雲 仁一, 中沢 益次郎
    1957 年 26 巻 2 号 p. 50-57
    発行日: 1957/02/10
    公開日: 2009/04/02
    ジャーナル フリー
    It is well known that if one places a pendulum with an iron bob in the neighborhood of a coil fed from the main, one observes that the pendulum attains its stationary oscillation. It seems that there is no necessity of a rational ratio between the frequency of the pendulum which is close to its proper one and the frequency of the main which is very high compared with that of the pendulum.
    In this paper, this phenomenon, first treated by J. Bêthenod, is studied analytically and it is concluded that the dissipated energy of the pendulum is supplied from the main by some retarded action of the electromagnetic force of the coil.
    The method of analysis can be applied to a class of electromechanical phenomena in which the mechanical system is maintained in oscillation at a frequency of or near its proper one at the expense of the energy supplied from the electrical system. Further, an electromechanical rotator based on the same principle as the Bêthenod's pendulum was devised and the experiment of which seems to support the validity of the analysis.
    Finally, the case in which the electrical system is a series ferroresonant circuit is discussed and it is pointed out that the energy of the pendulum is supplied by the oscillation hysteresis of the nonlinear circuit. As an application of this phenomenon, an electric master clock without electric contact was devised.
  • 矢沢 清弘
    1957 年 26 巻 2 号 p. 57-61
    発行日: 1957/02/10
    公開日: 2009/02/09
    ジャーナル フリー
    When electrolysis occurs in the glass stem of a vacuum tube during its operation, the potential distribution in the glass is always linear, but the gradient of the potential decreases due to the increase of the interface resistance on the positive electrode which is sealed in glass for metal welds.
    The oxidation is supposed to proceed on it, because the colour of the interface seems to change from that of lower oxide to that of higher oxide of metal.
  • 矢沢 清弘, 斎藤 一男
    1957 年 26 巻 2 号 p. 61-63
    発行日: 1957/02/10
    公開日: 2009/02/09
    ジャーナル フリー
    It is shown by electron diffraction that the substance of interface layer between metal electrode and glass caused by electrolysis of the stem undergoes transformation.
    For example, the substance of interface formed into TiO in the stem making is reduced at the negative electrode by the natrium ions moved to negative side and is oxidized into TiO2 at positive side by the excess oxygen ions left around the positive electrode.
    The electrical resistivity of the oxidized layer increases exponentially at the first stage of electrolysis and linearly with time at its final stage.
  • 三輪 博秀
    1957 年 26 巻 2 号 p. 63-67
    発行日: 1957/02/10
    公開日: 2009/02/20
    ジャーナル フリー
    D.C. stability of self-biased flip-flop circuit has been studied. The self-biasing is preferable for the benefit of good stability against the changes of power voltage. There are some commendable D.C. designs for fixed biasing but optimum bias design has not been worked out. This report gives the optimum bias value (Eq. 10) with the optimum dividing ratio of grid resistance (Eqs. 14_??_17), enabling to secure the best working condition for every type of tubes. An example of the design, a stability test and the result of over one year's continuous operation are also given. Permissible minimum plate load is discussed considering the stability conditions and maximum plate dissipation of several types of tubes. This design system has proved to be very useful.
  • 小畑 耕郎
    1957 年 26 巻 2 号 p. 67-71
    発行日: 1957/02/10
    公開日: 2009/02/20
    ジャーナル フリー
    Characteristics of vibration tangible to the tips of fingers have been observed in some conditions of contact with a vertical vibration generator. It is found that the amplitude of same tangible vibration _??_ is represented approximately by _??_
    _??_ the amplitude of same tangible vibration in μ
    K a parameter in μ
    ƒ the frequency per sec
    h2 a damping constant
    n1 the 1st order natural frequency of the vibration
    n2 the 2nd order natural frequency of the vibration
    θ the phase angle meaning the degree of contact conditions above equation has been developed from the equation given in the previous report (J. of App. Phy. Japan, Vol. 24, No. 3, p. 118).
    It is concluded that the human body can be represented by a fine vibrograph, its characteristic impedance being equal to the product of the sum of impedances of displacement and velocity vibrographs and the impedance of accelerometer, involving the phase angle which represents the contact conditions.
  • 小松原 毅一
    1957 年 26 巻 2 号 p. 72-76
    発行日: 1957/02/10
    公開日: 2009/02/09
    ジャーナル フリー
    Relations of transistor noise power with surrounding temperature are measured at 1000 cycles. The result is interesting in that a pronounced difference is observed between the noise characteristics in room temperature region and those in a lower temperature region. Reasonable explanations are given of the difference by studying separately the surface noise, the leakage noise and the diffusion noise as defined by W. H. Fonger. So experimental' verifications are made.
  • 蓮沼
    1957 年 26 巻 2 号 p. 78
    発行日: 1957/02/10
    公開日: 2009/02/09
    ジャーナル フリー
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