Fabrication of Nonporous Layer on Surface of ALPORAS by Friction Stir Incremental Forming

Porous metals having nonporous (skin) layer at the surface have a potential to improve the mechanical properties of the porous metals. To fabricate nonporous layer on surface of porous metals, friction stir incremental forming process is applied to form surface of a commercial closed-cell type aluminum foam (ALPORAS) in this study. In the process, the cell walls near the surface of the aluminum foam are plastically deformed by a rotating tool with a high rotation rate, fabricated the nonporous layer at the surface. The nonporous layer with thinner than 0.4 mm is fabricated at the surface without internal fracture of the aluminum foam under forming conditions of a tool rotation rate of 8000 rpm, a tool feed rate of 60 mm/min, and total forming depth of 7.0 mm.8th International Conference on Porous Metals and Metallic Foams, Metfoam 201

Fabrication of skin layer on aluminum foam surface by friction stir incremental forming and its mechanical properties

Matsumoto R., Tsuruoka H., Otsu M., et al. Fabrication of skin layer on aluminum foam surface by friction stir incremental forming and its mechanical properties. Journal of Materials Processing Technology 218, 23 (2015); https://doi.org/10.1016/j.jmatprotec.2014.11.030.Porous metals with a nonporous skin surface layer (sandwich structure) have a potential to improve their mechanical properties. Friction stir incremental forming process for sheet metals is applied to form the surface of a closed-cell type aluminum foam. In this process, the cell walls near the aluminum foam surface are plastically deformed and stirred by the rotation of a forming tool at a very high rate, and the nonporous skin layer is fabricated on the surface of the aluminum foam. Nonporous aluminum skin layer with a thickness less than 400 μm is fabricated at the surface without internal fracture of the aluminum foam under the following forming conditions; a tool rotation rate of 8000 rpm, a tool feed rate of 60 mm/min, and a total forming depth of 7 mm. To investigate the mechanism of formation of the skin layer, the skin layers fabricated with friction stir incremental forming and incremental hammering are compared. The compressive deformation behavior of aluminum foam with a skin surface layer is investigated by performing uniaxial compression test. The specific compressive strength of aluminum foam with a nonporous skin surface layer is improved by approximately 20-50%

An interspecific linkage map of SSR and intronic polymorphism markers in tomato

Despite the collection and availability of abundant tomato genome sequences, PCR-based markers adapted to large scale analysis have not been developed in tomato species. Therefore, using public genome sequence data in tomato, we developed three types of DNA markers: expressed sequence tag (EST)-derived simple sequence repeat (SSR) markers (TES markers), genome-derived SSR markers (TGS markers) and EST-derived intronic polymorphism markers (TEI markers). A total of 2,047 TES, 3,510 TGS and 674 TEI markers were established and used in the polymorphic analysis of a cultivated tomato (Solanum lycopersicum) ‘LA925’ and its wild relative Solanum pennellii ‘LA716’, parents of the Tomato-EXPEN 2000 mapping population. The polymorphic ratios between parents revealed by the TES, TGS and TEI markers were 37.3, 22.6 and 80.0%, respectively. Those showing polymorphisms were used to genotype the Tomato-EXPEN 2000 mapping population, and a high-density genetic linkage map composed of 1,433 new and 683 existing marker loci was constructed on 12 chromosomes, covering 1,503.1 cM. In the present map, 48% of the mapped TGS loci were located within heterochromatic regions, while 18 and 21% of TES and TEI loci, respectively, were located in heterochromatin. The large number of SSR and SNP markers developed in this study provide easily handling genomic tools for molecular breeding in tomato. Information on the DNA markers developed in this study is available at http://www.kazusa.or.jp/tomato/

A new cottid species, Icelus sekii (Perciformes: Cottoidei) from Hokkaido, Japan

A new cottid species, Icelus sekii, is described on the basis of six specimens collected from off Rausu and Urakawa, Hokkaido Island, Japan. This species is distinguished from its congeners by the following combination of characters: supraocular and parietal spines absent; nuchal spine obscure; uppermost preopercular spine unbranched; no scales between dorsal scale row and lateral-line scale row, and no scales below lateral-line scale row; supraocular, parietal, and nuchal cirri present; five dark brown saddles dorsolaterally; anal-fin rays 13; pectoral-fin rays 15; vertebrae 12 + 24~5 = 36~7. Icelus sekii can be mature at the smallest size among the species of Icelus. As a secondary sexual character, the male holotype has unique ensiform flaps on the distal tips of the first dorsal fin

Innovation Study for Materials Science Laboratory Management, Supported by Knowledge Science Tools : Five Cross-Disciplinary Projects

It has become a topical and widely accepted argument that innovation is the key to revitalizing competitiveness of a country, company and university. As a graduate university having the School of Knowledge Science, and the School of Materials Science, we have organized to make “innovation studies” for Materials Science Laboratory, supported by Knowledge Science tools with collaboration of these two schools as 5 cross-disciplinary projects. Knowledge Science side has provided knowledge tools, and Materials Science side has applied them to produce more creative and innovative research systems and research findings.(trial to induce innovation) Principle of innovation has been explained by our model in this paper, based on the innovation portfolio strategy by Niwa's diagnosis model^4) (by prof. K.Niwa). Targets(subjects) of innovation for laboratory management have been examined based on the Schumpeter classification^7) 5 projects have been evaluated as proceeding level, the type by Niwa model and the subject by Schumpeter model. Finally, we would like to conclude for this type of cross-disciplinary research, that the open minded collaboration and forward-facing presentation of the results are inevitable.The original publication is available at JAIST Press http://www.jaist.ac.jp/library/jaist-press/index.htmlProceedings of KSS'2007 : The Eighth International Symposium on Knowledge and Systems Sciences : November 5-7, 2007, [Ishikawa High-Tech Conference Center, Nomi, Ishikawa, JAPAN]Organized by: Japan Advanced Institute of Science and Technolog

Innovation Study for Materials Science Laboratory Management, Supported by Knowledge Science Tools : Five Cross-Disciplinary Projects(English Session)

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