Journal of the Society of Powder Technology, Japan
Online ISSN : 1883-7239
Print ISSN : 0386-6157
ISSN-L : 0386-6157
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Volume 32, Issue 1
Displaying 1-7 of 7 articles from this issue
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  • The Dust Explosibility of Several Kinds of Cellulose Derivatives
    Hiroo MUKAI, Hiroaki MUTO, Yoshiro ONDA
    1995 Volume 32 Issue 1 Pages 4-9
    Published: January 10, 1995
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.32.4
    JOURNAL FREE ACCESS
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    The minimum explosive concentration and ignition energy of several kinds of cellulose derivatives-methylcellulose, hydroxypropyl methylcellulose, low-substituted hydroxypropylcellulose, hydroxypropyl methylcellulose phthalate and hydroxypropyl methylcellulose acetate succinate-were measured to evaluate their potential for dust explosion.
    It was found that the explosibility of cellulose derivatives increased with a decreasing average particle size or bulk density and an increase in the amount of fibrous particles. These factors were expressed in a specific surface area. Moreover, the dust explosibility increased with a higher total molecular of substitution in the cellulose unit. However, it was hardly affected by the kind of substituents nor the average molecular weight of the cellulose derivatives.
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  • The Effect of Aggregation on Rheological Characteristicts of an Electrorheological Fluid of the Particle Dispersion Type
    Kunio SHIMADA, Makio IWABUCHI, Kenichi OKUI, Toyohisa FUJITA
    1995 Volume 32 Issue 1 Pages 10-15
    Published: January 10, 1995
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.32.10
    JOURNAL FREE ACCESS
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    A study was conducted on the effect of particle aggregation on the rheological characteristics of an electrorheological fluid of the BaTiO3 type as a colloidal ER fluid. Increasing viscosity by applying an electric field was measured using a rotating viscometer. The experimental data was compared with the theoretical analysis taking into account either uniform particle dispersion or particle aggregation. The effect of aggregation on the rheology of the ER fluid was clarified, and the increasing viscosity was quantitatively determined by a formula based on the aggregation model.
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  • The Difference Between 2-D and 3-D Distinct Element Solution of Granular Materials
    Jun YOSHIDA
    1995 Volume 32 Issue 1 Pages 16-22
    Published: January 10, 1995
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.32.16
    JOURNAL FREE ACCESS
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    The distinct element method (DEM) is generally used for problems concerning granular materials, and there are numerous reports which indicate validity of the DEM for such problems. Howerer, most of them are 2-dimensional (2-D), while those of 3-dimensional (3-D) models are concerned with a small number of particles. There is a difference between 2-D and 3-D analysis; practical phenomenon is three dimensional. Therefore, 3-D analysis is naturally better, but there is currently a shortage in the number of particles in 3-D analysis. It has been previously shown that the 2-D DEM can qualitatively simulate the behavior of granular materials. Thus 2-D and 3-D simulation must go together. In this paper, from the viewpoint of the arrangement of particles, i. e. the characteristics of the flow and arch effect, the differences between 2-D and 3-D are discussed using some examples. Considering these differences the DEM is found to be practical.
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  • Morphological Change of Antimony Trioxide Fine Particles through Impaction, Compaction or Grinding
    Kunihiro FUKUI, Tomoaki MATSUZAKI, Kuniaki GOTOH, Hiroaki MASUDA
    1995 Volume 32 Issue 1 Pages 23-30
    Published: January 10, 1995
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.32.23
    JOURNAL FREE ACCESS
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    The morphological changes of particles through three different processes (impaction, compaction and grinding) were investigated experimentally. This was done using two types of antimony trioxide (Sb2O3)-fine particles which have almost the same particle size distributions but different surface properties. One has the sulfate group (-SO4) on the surface; the other does not.
    It is found that the diameter of the Sb2O3 particles having -SO4 begins to increase at lower impaction velocity or at lower compaction pressure than those having no -SO4 does. Estimation of the load applied on a single particle through these two processes reveals that the threshold of the load inducing the particle enlargement is almost the same for impaction and compaction.
    The tendency for the diameter to change through grinding is opposite to that through impaction or compaction. However, the Sb2O3 particles having -SO4 keep higher crystallinity than those having no -SO4 among these three processes.
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  • New Application of Microcrystals-doped Glasses
    Mainly on Third-order Optical Nonlinearity of Semiconductor Microcrystals-doped Glass Thin Films
    Hiroyuki NASU
    1995 Volume 32 Issue 1 Pages 31-36
    Published: January 10, 1995
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.32.31
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  • [title in Japanese]
    Masumi UEDA
    1995 Volume 32 Issue 1 Pages 45-47
    Published: January 10, 1995
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.32.45
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  • [title in Japanese]
    Atsushi ENDO, Noboru SUZUKI
    1995 Volume 32 Issue 1 Pages 48-51
    Published: January 10, 1995
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.32.48
    JOURNAL FREE ACCESS
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