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Reduction of Springback of Sheet Metals by Bottoming
Takayuki Ogawa,Atsushi Hirahara,Fusahito Yoshida 한국소성가공학회 2010 기타자료 Vol.2010 No.6
The effect of bottoming on the reduction of springback is investigated by performing V-air-bending experiment on a high strength steel sheet of TS590MPa and the corresponding FE simulation. From the experiment, it was found that the springback is drastically decreased with increasing bottoming force. This is mainly due to the reduction of bending moment by compressive load acting normally to the sheet. At an early stage of bottoming, springback is also influenced by the change of geometrical rigidity of the bent sheet due to the straightening of ridge line warp. Since bottoming is a process of reverse deformation of tension-compression, the Bauschinger effect of materials should be taken into account for its accurate numerical simulation. 3D FE simulation using Yoshida-Uemori kinematic hardening model predicts well the bottoming effect.
Material Recovery by Informal E-waste Processing in the Philippines
( Atsushi Terazono ),( Masahiro Oguchi ),( Shunsuke Kuzuhara ),( Aya Yoshida ),( Ruji P. Medina ),( Florencio C. Ballesteros Jr ) 한국폐기물자원순환학회(구 한국폐기물학회) 2015 한국폐기물자원순환학회 3RINCs초록집 Vol.2015 No.-
Waste electrical and electronic equipment, i.e. e-waste, is a great concern among researchers and policymakers, due to its potential as a source of serious environmental pollution. In order to understand processes and issues by informal e-waste processing in the Philippines, informal smelting process for gold was clarified from the field survey at several smelters. Metal recovery tests were conducted at one site with actual e-waste samples. Three types of e-wastes were tested: computer memory boards, boards for hard disk drives, and boards for video cards. Among three e-waste samples tested, memory boards contained the highest amount of gold. Since the gold content of non-segregated e-waste is not high, pre-processing is essential for gold extraction to raise cost-effectiveness. With regard to health and environmental effect, many issues were found including protective equipment for workers.
Fire Prevention and Export Management of Mixed Metal Scrap
( Atsushi Terazono ),( Masahiro Oguchi ),( Aya Yoshida ),( Hiroshi Koseki ) 한국폐기물자원순환학회(구 한국폐기물학회) 2013 한국폐기물자원순환학회 심포지움 Vol.2013 No.2
Over one million tons of mixed metal scrap is annually exported from Japan to China for recycling purpose. Mixed metal scrap usually contains miscellaneous electric and electronic equipment including hazardous substances and sometimes causes fire. Regarding fires of mixed metal scrap, there are several cases of fire in ports or offshore in Japan recently. Fire incidents are often found at various stockyards as well. In spite of our investigations on some fire sites, the exact cause of the fire is hardly determined. We assume that the fire proceeds in two stages: fire breakout and fire spread. Fire breakout may be caused by lead acid battery, ignition from physical impact between metals, heat accumulation and/or others. Fire spread is easily caused by combustion of oil, plastic and other organic materials which contained in mixed metal scrap. Regarding hazardous substances control, Basel Convention and related domestic law restricts the exportation of recyclable resources when the level of hazardous substances contained in mixed metal scrap exceeds the criteria. However, since the mixed metal scrap is composed of heterogeneous materials, without detail chemical analysis of hazardous substances level, customs inspectors cannot judge hazardous waste or not. Therefore, we propose to create some negative list of electric and electronic equipment for simple clarification for export control.
Functional Analysis of Novel Collectins
SeongJae Jang,Atsushi Fukuoh,Katsuki Ohtani,Kenichiro Mori,Itsuro Yoshida,Yasuhiko Suzuki,Nobutaka Wakamiya 한국당과학회 2010 한국당과학회 학술대회 Vol.2010 No.1
Collectins are a family of collagenous calcium-dependent defense lectins in animals. Their polypeptide chains consist of four regions: a cysteine-rich N-terminal domain, a collagen-like region, an alpha-helical coiled-coil neck domain and a C-terminal lectin or carbohydrate-recognition domain. These polypeptide chains form trimers that may assemble into larger oligomers. The best studied family members are the mannan-binding lectin, which is secreted into the blood by the liver, and the surfactant proteins A and D, which are secreted into the pulmonary alveolar and airway lining fluid. The collectins represent an important group of pattern recognition molecules, which bind to oligosaccharide structures and/or lipid moities on the surface of microorganisms. Collectin placenta 1 (CL-P1), a recently discovered scavenger receptor, mediates the uptake of oxidized low density lipoprotein and microbes. In this study, we investigated CL-P1-mediated binding and ingestion of yeast-derived zymosan bioparticles using Chinese hamster ovary (CHO) cells stably expressing human CL-P1 (CHO/CL-P1) and human vascular endothelial cells constitutively expressed CL-P1. The uptake of zymosan by CHO/CL-P1 was dependent upon the level of CL-P1 expressed on the membrane and was inhibited by cytochalasin D and wortmannin. The binding of zymosan was also inhibited by ligands of other scavenger receptors such as poly(I) and dextran sulfate. Real time reverse transcription-PCR analyses showed that other scavenger receptors, namely LOX-1, Stabilin-2, or macrophage receptor with collagenous structure (MARCO), were not expressed in human umbilical vein endothelial cells isolated from different individuals. Nonopsonic zymosan ingestion was inhibited in three primary cultured vascular endothelial cells, including different human umbilical vein endothelial cells from nine individuals treated with CL-P1 small interfering RNAs (siRNAs), although small interfering RNAs of other scavenger receptors had no effect on zymosan uptake in these cells. Furthermore, we confirmed that CL-P1 is expressed in human and murine vascular endothelial layers. Our results demonstrated that CL-P1 predominantly mediated phagocytosis for fungi in vascular endothelia.