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51.
Guosheng Xu Tomohiko Yamakami Tomohiro Yamaguchi Morinobu Endo Seiichi Taruta Isao Kubo 《International Journal of Applied Ceramic Technology》2014,11(2):280-288
To enhance the fracture toughness of silicon carbide (SiC) ceramics and prevent the generation of cracks and chippings in the SiC ceramics during machining process, carbon nanofibres (CNFs) were compounded with SiC. The densification and microstructure development of the CNFs/SiC composites pressureless sintered in Ar atmosphere were investigated. The fracture toughness of SiC ceramics was enhanced by the addition of 1–3 wt% CNFs, which resulted from the pullout and/or bridging effect of CNFs bonded much more closely with SiC. The addition of 3 wt% CNFs prevented the chippings from generating in the composite during precision machining process. 相似文献
52.
Seiichi Taruta Mutsumi Matsuki Hiromasa Nishikiori Tomohiko Yamakami Tomohiro Yamaguchi Kunio Kitajima 《Ceramics International》2010
Eu-doped transparent mica glass–ceramics were prepared, the influence of Eu-doping on the crystallization of the parent glasses was investigated and the luminescent properties of the parent glasses and the glass–ceramics were estimated. A small additive amount of Eu element was very effective in preparing transparent mica glass–ceramics. However, the excess addition led to the coarsening of phase separation in the glass phase and the separation of unidentified crystal phases and β-eucryptite during heating of the parent glasses, which caused white opaque at lower heating temperatures. When mica crystals were separated, Eu ions entered the interlayers of mica crystals. The observed emission and excitation spectra showed that parts of Eu3+ ions which were added as Eu2O3 were reduced to Eu2+ ions during melting of the starting materials and heating the parent glasses in air and the energy transfer from Eu2+ to Eu3+ ions occurred. 相似文献
53.
Salah Aljbour Tomohiko Tagawa Hiroshi Yamada 《Journal of Industrial and Engineering Chemistry》2009,15(6):829-834
A simple capillary microreactor was tested as a potential reactor to carry out a multiphase reaction. The hydrolysis of benzyl chloride in a biphasic system was investigated. The capillary microreactor was irradiated by 28 kHz ultrasound at different temperatures, capillary lengths and phase flow rates. It was found that the combination of microreactor technique and the ultrasound irradiation provides a promising protocol for process intensification. Under sonication conditions, higher conversions were obtained compared to silent conditions. The presence of ultrasound has affected the multiphase slug size and promoted better internal circulation within these slugs. Similar reactivities were noticed at higher temperature for both sonication and silent conditions. 相似文献
54.
Guoyan?Zhang Satoshi?Tsunokawa Yukako?Hayashi Shinya?Matsumoto Yasuki?Matsumura Tomohiko?MoriEmail author 《Journal of the American Oil Chemists' Society》2003,80(5):497-501
Ion-exchange HPLC systems using POROS 20 HQ and Mono Q HR 10/10 columns were applied to isolate glycinin subunits under denaturing
conditions. Analyses by SDS-PAGE, N-terminal amino acid sequence, and sucrose density gradient centrifugation showed that
the pseudoglycinin from the highly purified homo-subunit, A3B4, was reconstituted. The A3B4 pseudoglycinin was similar to the native glycinin with respect to molecular size, subunit structure, and secondary structure.
The hexameric pseudoglycinin dissociated into trimers after long storage at pH 7.6. 相似文献
55.
Aga H Higashiyama T Watanabe H Sonoda T Nishimoto T Kubota M Fukuda S Kurimoto M Tsujisaka Y 《Journal of Bioscience and Bioengineering》2002,94(4):336-342
Production of cyclo[-->6)-alpha-D-Glcp-(1-->3)-alpha-D-Glcp-(1-->6)-alpha-D-Glcp-(1-->3)-alpha-D-Glcp-(1-->] (CTS, cyclic tetrasaccharide) from starch was attempted using 1,6-alpha-glucosyltransferase (6GT) and 1,3-alpha-isomaltosyltransferase (IMT) from Bacillus globisporus C11. The optimal conditions for production from partially hydrolyzed starch were as follows: substrate concentration, 3%; pH 6-7; temperature, 30 degrees C; 6GT, 1 unit/g-dry solid (DS); IMT, 10 units/g-DS. The production of CTS was demonstrated and 544 g of CTS hydrate crystal powders were obtained from 3500 g of partially hydrolyzed starch. Two major by-products were also isolated from the reaction mixture and identified as the branched derivatives of CTSs, 4-O-alpha-D-glucopyranosyl-CTS and 3-O-alpha-isomaltosyl-CTS. 相似文献
56.
Nakagawa T Kurita N Kozakai S Iwabuchi S Yamaguchi Y Hayakawa M Ito Y Aoyama T Nakajima T 《Journal of molecular graphics & modelling》2008,27(1):45-58
Peroxisome proliferator-activated receptor α (PPARα) has various physiological functions such as lipid and glucose metabolism, inflammation and fibrosis in living organisms. Many types of ligand molecules such as phthalate and adipate esters control these physiological functions. In the present study, to elucidate the dependence of PPARα properties on ligand binding, we investigated stable structures and electronic properties for the complexes of PPARα and phthalate as well as adipate esters, which are used as a plasticizer, by molecular simulations based on molecular mechanics and molecular orbital methods. Furthermore, to elucidate the influence of these esters in vivo, we injected them into male mice and observed the change in the expression of PPARα-related enzymes. The comparison between the calculated and observed results indicates that the change in the expression has a correlation with the size of energy gaps between highest occupied and lowest unoccupied molecular orbitals of the complexes with mouse PPARα and esters. 相似文献
57.
Surface cooling by an automatic control system using a water blanket ensures a bloodless method of accurate brain hypothermia for cerebral protection at various stages of medical treatment. The control of temperature without any effects from the outside environment means that medical staff have less need to use their special skills for the exact management of brain temperature in clinical application, although the method is based on an easily handled surface water-cooling system. However, water is not always an appropriate medium for clinical cooling, from the viewpoint of both patients and the medical staff, because of the maintenance of the system in an intensive care unit (ICU). In order to cope with such difficulties, air-cooling is proposed based on various simulation results. Here, the aim is to realize automatic temperature control based on a fuzzy algorithm as a clinical reflection of the medical staff’s knowledge and experience. Experiments were carried out using a mannequin with human thermal characteristics in order to verify the utility of the basic automatic air-cooling control system for the treatment of brain hypothermia. 相似文献
58.
Katsuhiro Yokota Kazuhiro Nakamura Tomohiko Kasuya Katsuhisa Mukai Masami Ohnishi 《Thin solid films》2005,473(2):340-345
Titanium nitride (TiN) films were deposited onto silicon wafers using an ion beam assisted deposition (IBAD) method with an electron cyclotron resonance (ECR) ion source for ionizing the nitrogen (N2) gas under a condition of high nitrogen ion to titanium neutral ratio. The deposition rate of the TiN films was strongly dependent on the evaporation rate, dTi, of Ti metal and decreased with increasing nitrogen ion current. The deposition rate can be approximated as d=βdTi?N2/{1/k+?N2}−αI, where β, k and α are proportional constants, ?N2 is the sum rate of neutral and ionized nitrogen impinging onto the substrate, and I is the nitrogen ion current. 相似文献
59.
Tomohiko Edura Jun Mizuno Ken Tsutsui Mikiko Saito Masahide Tokuda Harumasa Onozato Toshiko Koizumi Yasuo Wada Masamitsu Haemori Hideomi Koinuma 《Electrical Engineering in Japan》2005,152(2):39-46
Recently, organic molecular electronic devices such as molecular thin‐film transistors have received considerable attention as possible candidates for next‐generation electronic and optical devices. This paper reports on fabrication technologies of flat metallic electrodes on insulating substrates with a micrometer separation for high‐performance molecular device evaluation. The key technologies of fabricating planar‐type electrodes are the liftoff method by the combination of bilayer photoresist with overhang profile, electron beam evaporation of thin metal (Ti and Au) films, and SiO2‐CMP (Chemical Mechanical Polishing) method of CVD (Chemical Vapor Deposition)‐deposited TEOS (tetraethoxysilane)–SiO2 layer. The raggedness of the electrode/insulator interface and the electrode surface of the micro‐gap electrodes were less than 3 nm. The isolation characteristics of fabricated electrodes were on the order of 1013 ohms at room temperature, which is sufficient for evaluating electronic properties of organic thin‐film devices. Finally, pentacene FET (Field Effect Transistor) characteristics are discussed fabricated on the micro‐gap flat electrodes. The mobility of this FET was 0.015 cm2/Vs, which was almost on the order of the previous results. These results suggest that high‐performance organic thin‐film transistors can be realized on these advanced electrode structures. © 2005 Wiley Periodicals, Inc. Electr Eng Jpn, 152(2): 39–46, 2005; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/eej.20152 相似文献
60.
Takaaki Inada Tomohiko Hatakeyama Fumio Takemura 《International Journal of Refrigeration》2009,32(3):462-471
Gas-storage ice is the ice that contains various functional gas pores, and can be produced by freezing water in which a desired gas is dissolved. In this conventional method, however, the gas content in the ice is limited by the gas solubility in water. To overcome this limitation, we developed a method to produce gas-storage ice from water in which microbubbles of a desired gas are dispersed, and then obtained images of the structural features of pores formed in the ice prepared using this microbubble method. The images clarified the interaction between a microbubble arriving at an ice–water interface and an existing pore already formed in the ice. The air content in ice prepared using the microbubble method was higher than that prepared using the conventional method, and was about three times higher than the solubility of air in water. 相似文献