All issues
Volume 49, Issue 1
Displaying 1-5 of 5 articles from this issue
- |<
- <
- 1
- >
- >|
-
Hiroshi Sato, Katsuyasu Sugawara2012 Volume 49 Issue 1 Pages 4-11
Published: January 10, 2012
Released on J-STAGE: January 27, 2012
JOURNAL FREE ACCESSIn a series of studies on fabrication of thick-film inorganic electroluminescence device by co-firing of multi-layers consisted of phosphor, dielectric materials, transparent electrode and back electrode, effects of calcination condition, microstructure changes of Ca0.997Pr0.002TiO3 films during calcination or sintering, and barium diffusion from dielectric material to (Ca1-xSrx)0.997Pr0.002TiO3 phosphor on the photoluminescence characteristics were investigated. The results showed that calcination temperature above 800°C was necessary for the phosphor to suppress the crack and delamination caused by gas evolution and expansion during co-firing. The sintered films with dense and high crystallinity could be prepared by two steps heat treatment consisted of calcination and co-firing. It was also shown that chemical composition change and solid solution formation due to the barium diffusion to the phosphor during co-firing affected remarkably on the photoluminescence intensity. The combination of CaTiO3:Pr phosphor and BaTiO3 dielectric material was an appropriate system for the co-firing of thick films because of no barium diffusion and formation of solid solution. It was demonstrated that the inorganic electroluminescence device could be prepared with dense and high crystalline films by selecting the combination of phosphor and dielectric materials and controlling their calcination and sintering conditions.View full abstractDownload PDF (1332K) -
Yoshimitsu Koike, Kenji Kofu, Mitsuaki Ochi2012 Volume 49 Issue 1 Pages 12-18
Published: January 10, 2012
Released on J-STAGE: January 27, 2012
JOURNAL FREE ACCESSIn this research, the effect of frictional resistance on pressure loss in horizontal plug conveying was investigated. As a result, the ratio of pressure drop by the frictional loss to total loss ranged 70-93% tested conditions. It is also found that wall pressure at the bottom of pipe becomes the maximum due to gravity action. Furthermore, the cross sectional pressure distribution was found to be related to the particle velocity, i.e. as particle velocity becomes larger, wall pressure in circumference direction comes to act equally. Additionally, it was shown experimental values on mean wall pressure approach theoretical value.View full abstractDownload PDF (856K) -
Yoshimitsu Koike, Kenji Kofu, Mitsuaki Ochi2012 Volume 49 Issue 1 Pages 19-25
Published: January 10, 2012
Released on J-STAGE: January 27, 2012
JOURNAL FREE ACCESSUltrasonic vibration was applied to plug conveying line, and pressure drop was measured. As a result, pressure drop became smaller linearly with increasing of ultrasonic amplitude regardless of particles and flow conditions. Therefore, ultrasonic can reduce the frictional resistance between particles and pipe wall. Additionally the wall pressure was measured by the button sensors, and relation of reduction effect and wall pressure was examined. Reduction effect becomes smaller as wall pressure becomes larger in spite of kinds of particle. Therefore, it is possible to predict the reduction effect by ultrasonic.View full abstractDownload PDF (739K)
Review
-
Jun Hayashi, Fumiteru Akamatsu2012 Volume 49 Issue 1 Pages 26-34
Published: January 10, 2012
Released on J-STAGE: August 26, 2015
JOURNAL RESTRICTED ACCESSThe efficient flame assisted spray pyrolysis method by using flash boiling atomization under low-pressure condition was proposed. Methane-oxygen premixed flame was utilized as the heat source and the precursor water solution was sprayed at low-pressure field. The precursor water spray, which injected in low-pressure field, was secondary-atomized by flash boiling atomization. In order to investigate the effects of flash boiling atomization on the nanosized particle synthesis, the flashing spray was visualized, measured and analyzed by the Mie scattering method and PDA measurement. Furthermore, ZnO nanoparticles synthesized for investigating the effects of flash boiling atomization on the generated particles. It was found that the spray droplet was well atomized and dispersed when flash boiling occurred. In addition the size of synthesized particles became smaller under the conditions of high temperature and of low pressure.View full abstractDownload PDF (1176K)
Review: Frontier Research Series
-
Kazuyoshi Sato2012 Volume 49 Issue 1 Pages 35-41
Published: January 10, 2012
Released on J-STAGE: August 26, 2015
JOURNAL RESTRICTED ACCESSThis paper describes an approach for high performance solid oxide fuel cells （SOFCs） based on the nano/microstructural control of the electrodes through the synthesis of nanocomposite particles. The LaxSr1-xMnO3（LSM）/Y0.15Zr0.85O1.93（YSZ） nanocomposite particles were successfully synthesized via a new co-precipitation method with nanocrystalline YSZ particles dispersed in an aqueous medium. The nanocomposite particles provide the uniform nanostructured cathode consisting of the grains of approximately 100 nm in diameter, and the SOFC with quite high performance at intermediate temperature （700-800 ℃）. This paper also reports an approach for the atomic level control of nanocrystals, and describes its possibility to contribute for further performance enhancement of SOFCs.View full abstractDownload PDF (2025K)
- |<
- <
- 1
- >
- >|