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A Mismatch hybridization of α-Chitin Gel with β-Chitin Gel on the Preparation of Non-woven Fabrics
( Hiroshi Tamura ),( Serika Koiwa ),( Shinobu Okazaki ),( Seiichi Tokura ) 한국키틴키토산학회 2003 한국키틴키토산학회지 Vol.8 No.4
N/A Both α-chitin from Crab or Shrimp shells and β-chitin from squid pen were found to dissolve in calcium chloride dihydrate saturated methanol (chitin solvent) and regenerated to α-chitin type non-woven fabrics applying chitin hydrogel which was prepared by precipitation with addition of large excess of water to chitin solution. But β-chitin type no-woven fabrics was obtained from β-chitin slurry which was prepared by repeated mechanical agitation of β-chitin powder in limited amount of water followed by filtration of chitin slurry. Though the high tensile strengths were shown by each type of non-woven fabrics, low tensile property was shown by mixed type non-woven fabrics (α-chitin hydrogel+β-chitin hydrogel) probably due to mismatching of both polysaccharide molecule on th hybridyzation to form no-woven fabrics.
The Shortest Step Algorithm with Network Coding on Multihop Wireless Cyclic Networks
Hiroshi Tamura,Yuki Shimizu,Masakazu Sengoku,Shoji Shinoda 대한전자공학회 2009 ITC-CSCC :International Technical Conference on Ci Vol.2009 No.7
Multihop wireless networks consist of mobile terminals with personal communication devices. Each terminal can receive a message from a terminal and send it to the other terminal. If a terminal can not communicate the other terminal that sends data directly, some terminals relay the data. Network coding is a new architecture for wireless network and various applications using this architecture are expected. In this paper, we evaluate network coding in cyclic networks and we consider relations with a certain problem in the graph theory
( Hiroshi Tamura ),( Makoto Sawada ),( Seiichi Tokura ) 한국키틴키토산학회 2003 한국키틴키토산학회지 Vol.8 No.4
N/A The crystalline structure of chitosan fiber has been investigated to become chitin type crystalline structure by the increment of the degree of N-acetylation applting acetic angydrede in aqueous methanol. The critical degree of N- acetylation to maintain chitosan type crystalline structure was shown to be about 44% of the N-acetylation and to be converted to chitin type when the degree of N-acetylation of chitosan reached to 525. The fiber of chitosan type crystalline structure was also found to solvent system for chitin, even when degree of N-acetylation was around 44%, This conversion woule suggest following morphological composition of N- acetyl glucosamine residues that there is block of N-acetylated glucosamine residues among random distribution of glucosamine residues in chitosan molecule.
Edge Coloring Problem of Graph Theory Considering Interference on Network Coding
Hiroshi Tamura,Masakazu Sengoku,Shoji Shinoda 대한전자공학회 2008 ITC-CSCC :International Technical Conference on Ci Vol.2008 No.7
Multihop wireless networks consist of mobile terminals with personal communication devices. Each terminal can receive a message from a terminal and send it to the other terminal. If a terminal can not communicate the other terminal that sends data directly, some terminals relay the data. Network coding is a new architecture for wireless network and various applications using this architecture are expected. In this paper, we expand the previous coloring problem and propose a new coloring problem including the architecture.
Involvements of Stress Triaxiality in the Brittle Fracture during Earthquakes in Steel Bridge Bents
Hiroshi Tamura,Eiichi Sasaki,Hitoshi Yamada,Hiroshi Katsuchi,Theeraphong Chanpheng 한국강구조학회 2009 International Journal of Steel Structures Vol.9 No.3
Stress triaxiality is proposed as one of the key parameters to discuss the cause of brittle fracture during earthquakes in steel structures. This study analytically investigated the features of stress triaxiality in steel bridge bent subjected to earthquakes. The target structure is a steel bridge bent actually fractured during the South Hyogo prefecture Earthquake. From the investigations, it was confirmed that high stress triaxiality was generated at a point supposed as fracture origin. There is a possibility that the triaxiality was involved in the fracture strongly through the increase of maximum principal stress. Moreover, from the analyses accounting for several kinds of large earthquake waveforms, it was indicated that threre is possibility that the distribution of triaxiality around the fracture origin was not affected by significantly by each cycle and each waveform. Stress triaxiality is proposed as one of the key parameters to discuss the cause of brittle fracture during earthquakes in steel structures. This study analytically investigated the features of stress triaxiality in steel bridge bent subjected to earthquakes. The target structure is a steel bridge bent actually fractured during the South Hyogo prefecture Earthquake. From the investigations, it was confirmed that high stress triaxiality was generated at a point supposed as fracture origin. There is a possibility that the triaxiality was involved in the fracture strongly through the increase of maximum principal stress. Moreover, from the analyses accounting for several kinds of large earthquake waveforms, it was indicated that threre is possibility that the distribution of triaxiality around the fracture origin was not affected by significantly by each cycle and each waveform.