Bulletin of Japan Association for Fire Science and Engineering
Online ISSN : 1883-5600
Print ISSN : 0546-0794
ISSN-L : 0546-0794
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Volume 37, Issue 2
Displaying 1-3 of 3 articles from this issue
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Paper
  • Extinction Phenomena in Smouldering — Circular Cylinders —
    Setsuko SEGA
    1988 Volume 37 Issue 2 Pages 33-38
    Published: 1988
    Released on J-STAGE: March 14, 2012
    DOIhttps://doi.org/10.11196/kasai.37.2_33
    JOURNAL FREE ACCESS
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    As an investigation of the transition from the steady burning to extinction of cellulosic materials, the case of thin strips has been described in the first report. In order to examine whether such a theoretical treatment as mentioned in the above report holds in the smouldering of other forms of specimen also, the case of circular cylinder is reported in the present paper. The results show that the theoretical prediction on the relationship between specimen size (diameter) and ambient temperature at the steady-extinction transition coincides well with the experimental data obtained.
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  • Identification of Gasoline or Kerosene Modified by Fire
    Toshiyuki MITSUI, Takehisa YAMADA, Tsukasa KAWAMURA
    1988 Volume 37 Issue 2 Pages 39-49
    Published: 1988
    Released on J-STAGE: March 14, 2012
    DOIhttps://doi.org/10.11196/kasai.37.2_39
    JOURNAL FREE ACCESS
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    Gasoline or kerosene modifired by fire was identified by gas chromatography (GC). The identification was tried by multivariate analysis using a personal computer.
    The method of identification is as follows: Gasoline and kerosene are modified by heating or burning at regular time intervals and analyzed by GC. The area ratios of definite 20 peakes are caluculated and stocked as fundamental data. The sample is analyzed by GC. The specific peak area ratios of gasoline or kerosene are not changed out in spite of heating or burning and are used for the identification of gasoline or kerosene. The area ratios of definite peaks are calculated and compared with fundmental data. The comparision between sample data and fundmental data are carried out by clustering analysis, discriminant analysis, principal component analysis and factor analysis. The identification of a sample as gasoline or kerosene is determined by specific peak area ratios and discriminant function. The degree of modification of sample is determined by cluster distance, principal component score, and factor score. If sample does not coincide with gasoline or kerosene, it is pointed out by discriminant function, principal component, and factor score.
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  • Estimation of the Critical Water Application Rate from the Direct Measurement of the Vaporization Rate of the Water
    Satoshi TAKAHASHI
    1988 Volume 37 Issue 2 Pages 51-56
    Published: 1988
    Released on J-STAGE: March 14, 2012
    DOIhttps://doi.org/10.11196/kasai.37.2_51
    JOURNAL FREE ACCESS
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    Wood fuel fire is extinguished when the applied water rate exceed the maximum evaporation rate of the soaked water. A simple method was devised to measure the evaporation rate of the water. That is, to put a wet carbonized crib either on or under the burning crib. The evaporation rate is obtained by reducing the initial burning rate from the weight loss rate of the doubled crib. When necessary, it was directly calculated from the weight change of the wet crib.
    The evaporation rate thus obtained showed mountain-like shape and agreed also with calculated value as the author previousely predicted.
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