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Volume 3, Issue 5
Displaying 1-6 of 6 articles from this issue
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[in Japanese]1964 Volume 3 Issue 5 Pages 319-326
Published: May 10, 1964
Released on J-STAGE: October 21, 2010
JOURNAL FREE ACCESSDownload PDF (1515K) -
Koichiro Doi1964 Volume 3 Issue 5 Pages 327-331
Published: May 10, 1964
Released on J-STAGE: October 21, 2010
JOURNAL FREE ACCESSRelative humidity of the gas in equilibrium with saturated salt solution has been used as the fixed point of the scale of relative humidity. Lithium chloride is important to this aim for low relative humidity. But the reported values of the relative humidity in equilibrium with saturated lithium chloride solution are different each other. In this investigation, therefore, the value was newly determined using an improved direct method. Saturated lithium chloride solution and pure water are kept in the same temperature and the vapour pressures in equilibrium with them are measured respectively with U-tube manometers. Then, the relative humidity in equilibrium with saturated lithium chloride solution is given in the ratio of the liquid head differences of each manometer. This method has the following advantages: 1) Value of relative humidity can be obtained independently of the acceleration of gravity and the density of the liquid for manometer. 2) Accurate measurements of temperatures of saturated lithium chloride solution and pure water are not necessary a s long as both of them are kept in the same temperature. 3) Accurate measurement of relative humidity is comparatively easy.
Relative humidity in equilibrium with saturated solutions of several salts other than lithium chloride were also measured by this method.View full abstractDownload PDF (577K) -
Shigemasa ENOMOTO, Tsutomu ITO, Tomihiko FURUTA, Chizuo MORI1964 Volume 3 Issue 5 Pages 332-337
Published: May 10, 1964
Released on J-STAGE: October 21, 2010
JOURNAL FREE ACCESSTo improve the sensitivity in analytical applications of β-ray backscattering, the scatterlng characteristics are investigated by use of a 90Sr-90Y β-ray source and an anthracene scintillation spectrometer. The dependence of the scattering intensity on specimen atornic number is increased in proportion to the scattering angle and the observed scattering β-ray energy. Proposed in this paper are the following three methods to selectively measure the high energy component for sensitivity improvement:
1) Pulse height analyzing method
2) Spectroscopic method using ma netic field
3) Filter method
Sensitivity improvement was practically confirmed in such analytical works as determination of component of Cu-Sn alloy or powder mixture of TiC-WC, concentration of BaCl2 in aqueous solution, and thickness of layer of Sn on Fe.View full abstractDownload PDF (726K) -
Kunihiko ICHIKAWA1964 Volume 3 Issue 5 Pages 338-348
Published: May 10, 1964
Released on J-STAGE: October 21, 2010
JOURNAL FREE ACCESSAlthough the phase-plane and describing function methods are undoubtfully powerful in analysis of nonlinear control system, but there is an imperfection to formularize the solution. By formulari zing the solution, firstly it can be generalize the contemplative faculty and could be discerned esse ntial of non-linear operation. Inasmuch as no exact solution is existed for generalized non-linear systems, it must be fulfilled with approximate solution. Among the various analytic methods can be obtained some approximate solutions, the asymptotic method which was originated by Bogoliuboff and Mitropolysky are the most powerful method which has developed in the field of nonlinear me chanics. It is very important to ascertain to what extent the method shows the power in the field of automatic control where the damping factor is extremely large compared with the vibrating system and the order of system is generally very high. It is also very important to develope or modify, if possible, how the method is adaptable to automatic control system. The author has explained the application of the method to automatic control system and has reported the transient response analysis of the tanh type gain-saturation in second order system. The solution could not be formulated explicitly, but the rules for amplitude and phase modulations were found and some transient respo nses were obtained with some additional numerical calculations. The author made the initial-value chart which initial values of amplitude and phase could be found from the initial values of displa cement and velocity. It was revealed that the fair accuracy could obtained even in the system with damping factor is as large as 0.5 when the size of step input is considerably large. The process of building up of the transient response under amplitude and phase modulations was clearly analyzed by the asymptotic method.View full abstractDownload PDF (1475K) -
Mitsuo OTA1964 Volume 3 Issue 5 Pages 349-360
Published: May 10, 1964
Released on J-STAGE: October 21, 2010
JOURNAL FREE ACCESSMechanization of human ability to recognize the complex line patterns such as hand-printed charact ers and fingerprints has long been the common aim of engineers and biologists. The use of scanning techniques which compare a sample with a master template for acceptable discrimination between characters seems to be of little avail in the case of hand-printed character recognition owing to the lack of character invariants which make it possible to correctly recognize the various personalized writings. That is to say, it is quite free to let the hand-printing have such characteristics as size, location, slant, rotation and others which personalize the hand-printing.
This paper is concerned with the statistical method of hand-printed character recognition in a nume rical manner suitable for machine discrimination of hand-printed characters and similar line patterns. The operation rule of the categorizer is generally called the recognition function. The statistical recog nition function based upon a recognizability criterion for hand-printed characters has come from the introduction of a mathematical concept “distance” between the characters mapped into an N-dimensional parameter space under certain assumptions about the probability distribution of measurements.
A practical example involving the statistical recognition of hand-printed characters I, J and K is solved by means of the above mentioned techniques. The recognition accuracy under a level of singnificance is also experimentally derived. By this statistical recognition method, it can be practically found out that how effective such a parameter mapping is and further the experimental results obtained in this paper are proved not to be eccentric at all.View full abstractDownload PDF (1769K) -
1964 Volume 3 Issue 5 Pages 361-392
Published: May 10, 1964
Released on J-STAGE: October 21, 2010
JOURNAL FREE ACCESSDownload PDF (3662K)
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