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Volume 49, Issue 10
Displaying 1-4 of 4 articles from this issue
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Original Paper
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Kenji Tanno, Ryoichi Kurose, Takenobu Michioka, Hisao Makino, Satoru K ...2012 Volume 49 Issue 10 Pages 738-744
Published: October 10, 2012
Released on J-STAGE: October 19, 2012
JOURNAL FREE ACCESSIn a coal-fired thermal power plant, ash particles laden in flue gas adhere on de-NOx catalyst surface, and ash coverage causes the degradation of de-NOx catalyst. Therefore, in this study, effect of the flow in a honeycomb rectangular channel, which represents a single channel of de-NOx catalyst, on the adhesion characteristics of particles to the wall was investigated by applying a direct numerical simulation (DNS). Results show that the adhesion of particles is strongly affected by the flow. The particle adhesion is enhanced by turbulence near the inlet of channel, whereas suppressed due to the attenuation of turbulence in the downstream region. The particle adhesion also depends on particle diameter. Small particles adhere on the wall only in the upstream region, whereas large particles adhere all the way down to outlet, nevertheless flow transients to laminar. This is due to the fact that large particles keep the inertial force even in the downstream region. Moreover, the cross sectional position of particle adhesion also depends on both flow stagnation near the corner and a secondary flow which is driven on the plane normal to the streamwise direction.View full abstractDownload PDF (959K) -
Akira Kondo, Kouhe Hosokawa, Eri Nakamura, Masataro Okumiya, Hiroya Ab ...2012 Volume 49 Issue 10 Pages 745-749
Published: October 10, 2012
Released on J-STAGE: October 19, 2012
JOURNAL FREE ACCESSIn this paper, synthesis of lanthanum manganite powders were examined from starting powder materials by mechanical method using attrition-type milling without any extra heat assistance. Starting materials used were lanthanum oxide powder and manganese oxide powder. Equivalent particle diameters to the specific surface area of them were 300 nm and 35 nm, respectively. By using nanosized particles as starting materials, a part of mixture was rapidly synthesized to lanthanum manganite. Among the milled powders, composite particles in which core particle of lanthanum oxide were coated with nanoparticles of manganese oxide were observed. It was supposed that when composite particles received strong friction force by milling, local temperature at the interface between particles became higher, thus led to the powder synthesis.View full abstractDownload PDF (975K) -
Takehito Hayashi, Yoshiko Takeuchi, Kohei Tahara, Minoru Uchida, Hirof ...2012 Volume 49 Issue 10 Pages 750-757
Published: October 10, 2012
Released on J-STAGE: October 19, 2012
JOURNAL FREE ACCESSThe effect of sucrose fatty acid esters (SEs) on the disintegrating behaviors of lactose tablets was evaluated. Disintegration time and mass changes of tablets during disintegrating were determined. Cross-sections of tablets during disintegrating were also observed. Disintegration time of tablets with SEs was much shorter than that with magnesium stearate (Mg-st). Mass of tablets with Dilactose S and a hydrophilic SEs decreased faster than the others. Water penetration into tablets with Fast-Flo Lactose and a hydrophobic SEs or Mg-st was less than with the other lubricants. Two types of tablet porosity were calculated as tablet structural parameters related disintegration behaviors. It showed a relationship between the ratio of tablet porosity, εb/ εa, and disintegration time on tablets with SEs. In conclusion, SEs are useful as lubricants and a suitable combination of SEs and excipients in the formulation results in the rapid disintegration properties of tablets.View full abstractDownload PDF (955K)
Review: Frontier Research Series
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Kohei Tahara2012 Volume 49 Issue 10 Pages 758-764
Published: October 10, 2012
Released on J-STAGE: June 03, 2015
JOURNAL RESTRICTED ACCESSInteraction of biodegradable poly（DL-lactide-co-glycolide） （PLGA） nanoparticles （NPs） for drug carriers with cells are discussed in this review. A surface-modified PLGA NP for cellular drug delivery was established to encapsulate a number of drugs such as nucleic acid medicines and anti-cancer drug. The interaction with cells and intracellular fate of PLGA NPs could be controlled by changing the surface properties of NPs, suggesting their potential utility for the intracellular drug delivery of nucleic acid-based drugs. Furthermore, we found PLGA NPs works as not only a safe and efficient drug carrier but also an inhibiting allergic responses mediated by mast cells.View full abstractDownload PDF (855K)
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