圧縮・せん断複合負荷による高機能軽金属粉末の組織制御成形法

研究代表者らが開発した「圧縮ねじり成形法」は圧縮・せん断複合負荷の加工が可能で、被加工材の形状を変えることなく材料内部に大きな塑性ひずみを導入できる特徴がある。本研究はこの特徴を有効に利用し、軽金属材料を対象に材料内部の組織を高度に制御する新しいプロセスの開発を目的として、金属間化合物の合成同時成形およびアルミニウムの結晶粒微細化法について検討した。その結果、次のことが明らかとなった。 ○金属間化合物の合成同時成形及び金属との同時接合 1.アルミニウムとチタンの混合粉末を圧縮ねじり成形することによって、メカニカルアロイングの効果を確認することができた。すなわち、二層ラメラー組織の形成を経てAl_3Tiの金属間化合物相の生成を確認することができた。 2.金属間化合物の生成は、せん断変形の大きい駆動側外周部に限られるが、成形温度、成形圧力、ねじり回数の条件を適正に変化させることによって、生成領域は拡大する。 3.金属間化合物の生成と同時に、アルミニウムや銅合金のバルク材との接合が可能である。 ○純アルミニウムの結晶粒微細化 1.初期粒径100μm程度の純アルミニウム溶製材を圧縮ねじり加工することによって、形状を変えることなく無く10μm以下の結晶粒径まで微細化が可能である。 2.結晶粒の微細化は駆動側に限られるが、上下反転して繰返しねじり加工することによって、資料の多くを微細化することが可能である 3.加工温度を低く、試料高さが低いほど微細化効果は顕著に現れる。科学研究費補助金 研究種目:基盤研究(B)(2) 課題番号:11555183 研究代表者:金武 直幸 研究期間:1999-2001年度research repor

Limit Sets of Nonlinear Dynamical Systems(1)Synthesis of Inverse Problem

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奈良先端科学技術大学院大学修士(工学)master thesi

A plot of the total number of clusters as a function of clustering parameters shows an inflection point near 0

65 identity and 0.70 match length. The inflection, which minimizes the rate of change in the number of clusters per change in parameters, suggests a set of parameters that optimally segregates orthologs and paralogs.<p><b>Copyright information:</b></p><p>Taken from "Characterization and modeling of the core and supragenomes based on the complete genomic sequences of Rd and 12 clinical nontypeable strains"</p><p>http://genomebiology.com/2007/8/6/R103</p><p>Genome Biology 2007;8(6):R103-R103.</p><p>Published online 5 Jun 2007</p><p>PMCID:PMC2394751.</p><p></p

A 20 kb region that demonstrates strain diversity at the level of an individual gene (lic2C), a pair of genes (NTHi0683/4), and a group of seven functionally related genes (urease system)

86-028NP is used as a reference for the alignment, and sequence present in other strains without homology to 86-028NP is not shown.<p><b>Copyright information:</b></p><p>Taken from "Characterization and modeling of the core and supragenomes based on the complete genomic sequences of Rd and 12 clinical nontypeable strains"</p><p>http://genomebiology.com/2007/8/6/R103</p><p>Genome Biology 2007;8(6):R103-R103.</p><p>Published online 5 Jun 2007</p><p>PMCID:PMC2394751.</p><p></p

A multi-sequence alignment using 86-028NP as a reference shows varying degrees of homology among 6 strains to a 50 kb region homologous to the plasmid ICEhin1056

The plasmid is integrated in 86-028NP and is partially present in R2866, but absent from the other strains in the alignment. Sequences present in other strains without homology to 86-028NP are not shown.<p><b>Copyright information:</b></p><p>Taken from "Characterization and modeling of the core and supragenomes based on the complete genomic sequences of Rd and 12 clinical nontypeable strains"</p><p>http://genomebiology.com/2007/8/6/R103</p><p>Genome Biology 2007;8(6):R103-R103.</p><p>Published online 5 Jun 2007</p><p>PMCID:PMC2394751.</p><p></p

A 40 kb region present in Rd KW20 shows two blocks of genomic variation among other strains

The upstream block is bounded on the right by a frame-shifted insertion sequence (IS) element (HI1018). The downstream block (HI1024-HI1032) includes genes with likely roles in sugar transport and metabolism. Rd is used as a reference for the alignment, and sequence present in other strains without homology to Rd is not shown.<p><b>Copyright information:</b></p><p>Taken from "Characterization and modeling of the core and supragenomes based on the complete genomic sequences of Rd and 12 clinical nontypeable strains"</p><p>http://genomebiology.com/2007/8/6/R103</p><p>Genome Biology 2007;8(6):R103-R103.</p><p>Published online 5 Jun 2007</p><p>PMCID:PMC2394751.</p><p></p

A pairwise genic comparison of 12 NTHi strains of and the reference strain Rd KW20

The comparison of two strains is found at the intersection of the row and column corresponding to the respective strains. Strains are compared based on the number of genes shared between the pair, the number of genes found in one strain but not the other, and the number of shared genes that are unique to that pair of strains. A typical pair of strains differs by 395 genes. Similar pairs of strains are shaded in yellow, while divergent strains are shaded orange.<p><b>Copyright information:</b></p><p>Taken from "Characterization and modeling of the core and supragenomes based on the complete genomic sequences of Rd and 12 clinical nontypeable strains"</p><p>http://genomebiology.com/2007/8/6/R103</p><p>Genome Biology 2007;8(6):R103-R103.</p><p>Published online 5 Jun 2007</p><p>PMCID:PMC2394751.</p><p></p

The distribution of genes among gene classes in the supragenome model trained on 8 or 13 strains

The only significant difference occurs in the rare gene categories with frequency 0.01 and 0.10. A small sample of eight strains is not expected to generate accurate predictions for these categories.<p><b>Copyright information:</b></p><p>Taken from "Characterization and modeling of the core and supragenomes based on the complete genomic sequences of Rd and 12 clinical nontypeable strains"</p><p>http://genomebiology.com/2007/8/6/R103</p><p>Genome Biology 2007;8(6):R103-R103.</p><p>Published online 5 Jun 2007</p><p>PMCID:PMC2394751.</p><p></p