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Yasushi Hirabayashi, Tomoe Nishino, Yasunori Fujiwara, Toshiyuki Fujim ...2010 Volume 47 Issue 10 Pages 684-691
Published: October 10, 2010
Released on J-STAGE: October 21, 2010
JOURNAL FREE ACCESSComposite films composed of graphite particles and polymer resin should exhibit functional properties such as electrical conductivity and elasticity. This study aims to produce fine flaky graphite particles for use as electrical conductive source materials within graphite / phenol resin composite films. We prepared graphite intercalation compounds with exfoliated graphite layers due to the insertion of two types of guest molecules. Then planetary ball wet milling was performed to produce flaky graphite particles by removing the exfoliated layers of the graphite intercalation compounds.
Some composite films derived from the phenol resin and the obtained flaky graphite particles displayed much higher electrical conductivities compared to films composed of feed graphite particles. Additionally, we successfully applied the grinding method proposed in this study to decrease the weight fraction of the graphite particles in the composite films, and these films exhibited high electrical conductivities.View full abstractDownload PDF (890K) -
Seasonal Changes in the Aggregate Status of Particles in Dough used in the Manufacture of InsulatorsTakatoshi Kimura, Koichiro Nakaushiro, Hiroshi Kariya, Takamasa Mori, ...2010 Volume 47 Issue 10 Pages 692-696
Published: October 10, 2010
Released on J-STAGE: October 21, 2010
JOURNAL FREE ACCESSIn order to clarify the mechanism of seasonal changes in agglomeration and dispersion of the slurry used in the manufacture of insulators, we focused our attention on the concentration of iron ions which elute within slurry, added water glass and long-term storage treatment to process slurry, ore slurry and clay slurry, carried out heating treatment, and then measured the concentration of the eluted iron ions. Furthermore, when we evaluated the variations in zeta potential and slurry fluidity, we discovered that there was an influence caused by slurry temperature during ore grinding. Slurry temperature during ore grinding can be 20°C or more warmer in the summer than in the winter. As a result, even greater amount of iron ions elute from the pottery stone. The elution of iron ions causes particles to acquire more negative charge, which causes stronger repulsion among particles. We learned that, during the summer months, when slurry is warmer and there is a great amount of eluted iron ions, slurry tends to disperse. Conversely, we also learned that in the winter months slurry tends to agglomerate.View full abstractDownload PDF (610K) -
Hideo Kawahara, Saori Nakamura, Koichiro Ogata2010 Volume 47 Issue 10 Pages 697-706
Published: October 10, 2010
Released on J-STAGE: October 21, 2010
JOURNAL FREE ACCESSA dual structure hopper which consists of a cone hard container and a flexible container of soft material can avoid the blockage phenomenon of cohesive powder near the orifice using the periodic vibration by the air pressure which changes on the opening and shutting times of the solenoid-controlled valve. This study experimentally investigated the characteristics of powder flow structure and interstitial air pressure during the discharge of flyash powder of 22.4μm from an orifice of this hopper when the air pressure and the opening time were changed. Then, the discharge mass of powder, the interstitial air pressure and the flow pattern in powder bed were measured. It is found that the cavity is generated by the collapse of powder bed due to the air vibration, and that it has risen toward the top of powder bed inside the hopper. And, the continuous discharge of powder and the periodic interstitial air pressure by the change of flow structure of powder bed can be confirmed. In addition, we made a schematic diagram of powder flow in the dual structure hopper using air vibration, and discussed powder flow state inside the hopper.View full abstractDownload PDF (1309K)
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－Practical Usage of the DEM in Complicated Powder Systems in Industries－Shigeto Yusuke, Mikio Sakai2010 Volume 47 Issue 10 Pages 707-716
Published: October 10, 2010
Released on J-STAGE: January 31, 2017
JOURNAL RESTRICTED ACCESSThis paper describes the parallel simulation technique of the Discrete Element Method on multi-core processors. Recently the multi-core processors like CPUs or GPUs attract the attention to accelerate the computer simulations in various fields. In those simulations, effective usage of memory space is important. In the present study, the link-list was applied and optimized to utilize the memory space effectively on multi-core processors. In the past studies, the performances of the GPUs were reported to be dozens of times faster than those of the CPUs, while these comparisons were unfair. In this study, the simulation codes were developed and optimized for multi-core CPUs and GPU with almost the same algorithm. The latest CPUs and GPU were used to compare their performances fairly. The simulation results show that difference of these performances is not eminent.
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Keiichi Miura2010 Volume 47 Issue 10 Pages 717-721
Published: October 10, 2010
Released on J-STAGE: January 31, 2017
JOURNAL RESTRICTED ACCESSThe cement plants can recycle various kinds and much amount of waste materials as a raw material or fuel through the characteristics in manufacturing cement. Many types of advanced recycling technologies of waste materials have been developed, such as fly ash washing system, ecocement, AK system and chlorine bypass system. The amount of waste materials and by-products which are utilized to produce 1 ton of cement has been increasing. This utilization significantly contributes to the saving of natural resources and fossil fuel.
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