Online ISSN : 1349-838X
Print ISSN : 0019-2341
ISSN-L : 0019-2341
Volume 72 , Issue 10
Showing 1-8 articles out of 8 articles from the selected issue
  • 1988 Volume 72 Issue 10 Pages 437
    Published: 1988
    Released: July 19, 2011
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  • Fumio Watanabe
    1988 Volume 72 Issue 10 Pages 591-595
    Published: October 01, 1988
    Released: July 19, 2011
    Ozone production capacity of low pressure mercury vapor quartz lamps was measured in order to design industrial equipments for photo oxidation processes.
    The lamps used in the experiments were made from two kinds of conventional and synthetic quartz tubes. A main spectral line is 253.7nm in cylinder shaped 8W lamps. Supplying air and oxygen into an annular space of a double pipe structure, author examined the relation between the concentration of ozone produced and gas flow rate (0.025-15l/min). In the measurment the width of the annular space was changed, keeping the length of the pipe constant.
    The ozone concentration increased with gas flow rate in the low rate range. However, it became in inverse proportion in the range of high gas flow rate. That is, a reversing zone of concentration was found in the experiments.
    Here, author obtained the relative formula between supplied gas quantity and the concentration of ozone produced.
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  • Masayoshi Nagata
    1988 Volume 72 Issue 10 Pages 596-601
    Published: October 01, 1988
    Released: July 19, 2011
    Monte Calro calculations of illuminance distribution in interior have already been performed, and part of their results has also been published. Then, it can be considered that the Monte Carlo simulation have, particularly value in simulation of complex geometries, such as concave or non-planer interiors which are composed of partitions or screens interecepted paths of photon bundles between the enclosure walls in an interior.
    The present paper deals with numerical experimental results of illuminance distribution by means of the Monte Carlo simulation in concave interiors which have a partition or a screen on the floor, as a result, all points on the surface walls in this interior do not see each other.
    In order to clear display illuminance ditributions on the surface walls, it is represented in the form of circles on the area element which are obtained by evenly dividing each surface wall into 1, 600 ones, and the diameter of circles is taken to be proportional to the ratio of the illuminance on any area element to the maximum one.
    From these numerical experiments and theoretical calculation results, it is clear that the effect of a partition and a screen on the illuminance distribution and features of illuminance values for all surface walls are determineds by the Monte Carlo Simulation and distinctly illustrated by use of these circles on the surfaces.
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  • Yoshinobu Nayatani, Kotaro Takahama, Hiroaki Sobagaki
    1988 Volume 72 Issue 10 Pages 602-607
    Published: October 01, 1988
    Released: July 19, 2011
    The eye lens and the macular pigment have been treated to be transparent for the long wavelengths. On the other hand, the observer variations of the color matching functions (CMF's) suggests that the lens and the macular pigment have unneglisible densities in the long wavelengths. In the present paper, improved values for the optical densities are proposed on the basis of the observer variation of CMF's. First, the principal component analysis is applied to the red CMF's of Stiles' 20 observers. The first eigen vector and the second eigen vector correspond to the spectral density functions of lens and macular pigment, respectively. Improved values of densities of lens and macular pigment are defined by connecting the published data of densities with the corresponding eigen vectors. Next, CMF's of Stiles' 20 observers are estimated by using the improved values of densities. It is confirmed that these estimated CMF's fit well the measured CMF's for the X component of CMF compared with the estimated CMF's from the published data though there is not an appreciable improvement for the Y and the Z component. Finally, the method of singular value decomposition is applied to the estimated CMF's from the improved densities. Deviate functions derived agree well with the deviate functions based on the measured CMF's.
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  • Naoyoshi Nameda, Hitoshi Ohzu
    1988 Volume 72 Issue 10 Pages 608-612
    Published: October 01, 1988
    Released: July 19, 2011
    Retrogradation of MTF (Modulation Transfer Function) properties for human visual sustem according to ages was measured by the MTF measurement apparatus, which produced interference fringes on subjects retina directly. Temporal properties were also measured by drifting interference fringes produced by tilt of a thick glass plate placed in the optical system.
    It was shown high spatial frequency properties were gradually deteriorated untill forty years old, and after the forty years old, spatial properties for all the spatial frequency region were affected. For temporal frequency properties, significant evidence was that higher sensitivity for a drifting pattern, was appeared at relatively lower spatial frequency region. If two spatio-temporal frequency neural network systems are assumed, the above evidence is well explained.
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  • Yoshihiko Tabuchi, Hajimu Nakamura, Yoshiyuki Kuchiishi, Masanobu Nish ...
    1988 Volume 72 Issue 10 Pages 613-619
    Published: October 01, 1988
    Released: July 19, 2011
    Limitation of discomfort glare from a lighting installation is one of the important factor for comfortable lighting.
    In order to clear the preferable condition of luminance on lighting installation, it is important to establish the criterion for discomfort glare evaluation from the light source not only in the peripheral vision but also in the central vision. However, the experiments were insufficient in the former studies, accordingly the experimental study using subjective appraisal related to discomfort glare was carried out in this paper.
    As a result, authors give a formula for calculating the glare effect, as follows:
    Glare degree (Gi)=k [1.407 log Ls+ {0.0390 (logω) 2+0.439 log ω-2.09}-log Lb+c]
    Where Ls=source luminance (cd/m2)
    Lb=surround luminance (cd/m2)
    ω=apparent area of source (sr)
    k, c=constants
    Substituting k=9 and c=3 in the formula, the subjective ratings is expressed in a scale which may be translated as:
    severe glare...30
    considerable glare...27
    slight glare...22
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  • Michio Iemura, Sumio Maeda, Junichi Yamaguchi
    1988 Volume 72 Issue 10 Pages 620-625
    Published: October 01, 1988
    Released: July 19, 2011
    The research relates to the starting harmonic characteristics of the lag type operating circuit for the high pressure mercury arc lamp and the way to improve the power factor in the circuit in the rated condition with a view to saving energy.
    The research has been conducted in the following sequence. First, sinusoidal rated voltage is supplied at the input terminal of the lag type operating circuit for the high pressure mercury arc lamp.
    (1) From the time when the rated voltage is supplied, the current, voltage, and luminous flux are measured every ten seconds till the lamp gets fully illuminated, and the operating characteristics are considered.
    (2) The wave analyses of the voltage and current of distorted waves at each element are made at each moment when the lamp voltage becomes 20 V, 40 V, 60 V, 80 V and 100 V during the above mentioned starting period. The wave analyses are also made in the stable condition: 115 V. By the examination of the followings, the starting characteristics of a lamp are clarified.
    (a) The vector diagrams are obtained for the voltage and current of each harmonic at each element.
    (b) The effective power, reactive power, apparent power, and distorted power at each element are obtaioned.
    (3) A condenser is connected in parallel with the input terminal, and investigations are made to improve the power factor of the supply voltage and current.
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  • Iwao Miyachi, Masayuki Yoda, Yoshihiko Suzuki
    1988 Volume 72 Issue 10 Pages 626-631
    Published: October 01, 1988
    Released: July 19, 2011
    Detailed analyses of radiated solar energy on the surface of the earth are requested as it is practically utilized not only for the up-to-date design of daylight buildings but also for the solid-state energy conversion of sunshine.
    This paper deals with the accumulated quantitative data on spectral irradiance of solar energy for a period of five years conducted at the Aichi Institute of Technology making use of an excellent system of spectro-radiometer.
    The global and scattered characteristics of solar radiation under clear sky are compared and discussed in detail by taking the diurnal, seasonal and yearly variations into consideration. The typical irradiance at 550 nm is also discussed in relation to the accepted total power and the altitude of the sun respectively.
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