Tominaga M.,Kumamoto University |
Tominaga M.,Kumamoto Institute for Photo Electro Organics Phoenics |
Togami M.,Kumamoto University |
Tsushida M.,Kumamoto University |
Kawai D.,Toho Gas Co.
Analytical Chemistry | Year: 2014
Nondoped and N-doped SWCNTs (N-SWCNTs) were used to clarify the effect of N-doping on a direct electron transfer (DET) reaction of laccase (Lac, from Trametes sp.). The level of N-doping in the carbon phase of the N-SWCNTs, which were synthesized by a CVD method, was determined to be 0.1, 2.4, and 4.1% from X-ray photoelectron spectroscopy measurements. The N-SWCNTs were also carefully characterized using electron microscopy, Brunauer-Emmett-Teller (BET) specific surface area measurements, Raman spectroscopy, and electrochemistry. The bioelectrocatalytic current for the DET reaction of Lac immobilized onto the N-SWCNTs tended to decrease with increasing N dopant ratio, whereas the amount of Lac adsorbed per BET surface area of the N-SWCNTs did not depend on the N dopant ratio. There were two main explanations for this behavior. First, an electrostatic interaction between the positively charged interface of the N-SWCNTs due to nitrogen species surface functional groups and the negative charges of carboxylate residues surrounding the T1 site. Second, the surface potential of the N-SWCNTs during Lac modification, because the slope value of the surface potential versus N dopant ratio of the N-SWCNTs was about 53 mV/N%. From additional investigations into the surface potential effect and thermodynamic investigations, we carefully concluded that the above behaviors may be due to denaturation and/or decreasing of the DET reaction rate caused by the strong electrostatic interaction between Lac and the N-SWCNTs surface. © 2014 American Chemical Society.
Tokumasu T.,Tohoku University |
Ito D.,Toho Gas Co.
Journal of Applied Physics | Year: 2011
The effects of the motion of atoms or molecules on the dissociation probability of the H2-Pt(111) system were analyzed by molecular dynamics. The embedded atom method (EAM) was used to model the interaction between a Pt(111) surface and an H2 molecule to consider the dependence of electron density. Initially, the EAM potential was constructed to express the characteristics of the system, such as the electron density or dissociation barrier at certain sites and orientations, as obtained by density functional theory (DFT). Using this potential, simulations of an H2 molecule impinging on a Pt(111) surface were performed, and the characteristics of the collision were observed. These simulations were performed many times, changing the orientation of the H2 molecule, and a dynamic dissociation probability at each site against impinging energy was obtained. On the other hand, a static dissociation probability was defined from the dissociation barrier of a hydrogen molecule obtained by the EAM potential. These results were compared to one another, and the effects of the motion of atoms or molecules, which were called dynamic effects, on the dissociation probability were analyzed. The dynamic effects on the dissociation phenomena were very large at the top site, but were small at bridge or fcc sites. © 2011 American Institute of Physics.
Moriyama T.,Toho Gas Co.
International Gas Research Conference Proceedings | Year: 2014
Toho Gas Co Ltd is a city gas provider supplying natural gas to the Tokai region located in the central part of Japan. The company is developing and distributing highly efficient devices while converting fuel to natural gas, which is an environmentally superior fuel and thereby assisting energy conservation and CO2 reduction activities of the clients. A highly efficient immersion burner (GIH) for molten aluminum holding furnaces as an example of the development of highly efficient devices at Toho Gas is described. The use of the surface combustion technology with nozzle mixing method realized slow combustion and enabled preheating of combustion air through the recovery of waste heat. High thermal efficiency of 75% or more was confirmed with this system. GIH has sufficient energy efficiency and CO2 emissions reduction performance. This is an abstract of a paper presented at the International Gas Union Research Conference (Copenhagen, Denmark 9/17-19/2014).
Tanaka Y.,Toho Gas Co.
Proceeding of the International Conference on Electrical Power Quality and Utilisation, EPQU | Year: 2011
This paper presents an evaluation of the CO 2 emission performance of a residential combined photovoltaic(PV), fuel cell(FC) and battery power system, whose commercialization in the near future shows promise considering that photovoltaic and fuel cell dual power generation systems are gaining popularity and residential battery power storage systems are being commercialized. A mathematical model of the power system is formulated as a mixed integer programming problem to make the optimal operation schedule for the system. The mathematical model includes electricity balance, heat balance and characteristics of system components. Annual CO 2 emissions of 14 houses with the PV/FC/Battery power system were calculated assuming optimal system operations were conducted. The real-life electricity and heat demand data of 14 houses were used for these calculations. The calculations were carried out in "No battery", "With battery" and "With battery and No backward flow" scenarios and the results compared. This research clarifies the CO 2 emission performance of a PV/FC/Battery system as well as the reason behind the CO 2 reduction and the change of CO 2 emission performance when power backward flow is controlled. © 2011 IEEE.
Toho Gas Co. | Date: 2016-02-29
Memory cards for video game machines; cellular phones; smartphones; cordless telephones; video telephones; answering machines; facsimile machines; phototelegraphy apparatus; audio- and video-receivers; sound transmitting apparatus; walkie-talkies; video baby monitors; navigation apparatus for vehicles on-board computers; radar apparatus; Global Positioning System GPS apparatus; electric installations for the remote control of industrial operations; sound reproduction apparatus; DVD players; digital photo frames; camcorders; video recorders; electronic notice boards; aerials; masts for wireless aerials; cell phone straps; telephone receivers; telephone transmitters; hands free kits for phones; coils, electric; holders for electric coils; head cleaning tapes recording; loudspeakers; horns for loudspeakers; cabinets for loudspeakers; transponders; video screens; headphones; microphones; megaphones; tone arms for record players; needles for record players; speed regulators for record players; acoustic couplers; magnetic encoders; magnetic wires; amplifiers; floppy disks; disks, magnetic; computers; computer peripheral devices; pocket calculators; encoded identification bracelets, magnetic; electronic tags for goods; electronic pocket translators; electronic agendas; electronic book readers; teleprompters; identity cards, magnetic; X-ray tubes not for medical purposes; vacuum tubes radio; triodes; thermionic tubes; electric discharge tubes, other than for lighting; semi-conductors; integrated circuits; wafers for integrated circuits; printed circuit boards; computer operating programs, recorded; cyclotrons; apparatus and installations for the production of X-rays, not for medical purposes; sonars; betatrons; metal detectors for industrial or military purposes; lasers, not for medical purposes; marine depth finders; particle accelerators; eyeglasses; goggles for sports; contact lenses; anti-glare glasses; divers masks; containers for contact lenses; eyeglass cords; spectacle lenses; eyeglass chains; eyeglass cases; eyeglass frames; video game cartridges; phonograph records; compact discs audio-video; downloadable music files; animated cartoons; downloadable image files; cinematographic films, exposed; X-ray films, exposed; X-ray photographs, other than for medical purposes; frames for photographic transparencies. Boxes of cardboard or paper; conical paper bags; wrapping paper; hygienic paper; tissues of paper for removing make-up; towels of paper; table napkins of paper; handkerchiefs of paper; paper; stationery; song books; calendars; magazines periodicals; printed timetables; books; newspapers, geographical maps, pamphlets; trading cards other than for games; posters; graphic prints; pictures; engravings; photographs printed; photograph stands. Clothing; garters; sock suspenders; braces for clothing suspenders; belts clothing; footwear; masquerade costumes; ski gloves; headbands clothing; wet suits for water-skiing. Video game machines; controllers for game consoles; bowling apparatus and machinery; amusement machines, automatic and coin-operated; toys; dolls; dice; cups for dice; chess games; checkers games; conjuring apparatus; dominoes; playing cards; Mah-jong; backgammon games; bingo cards; pachinkos; darts; billiard cues; billiard cue tips; chalk for billiard cues; billiard balls; billiard markers; billiard tables; billiard table cushions, baseball gloves; tennis ball throwing apparatus; tennis nets; rackets; gut for rackets; tables for table tennis; golf clubs; golf bags, with or without wheels; divot repair tools golf accessories; golf gloves; hockey sticks; ball pitching machines; discuses for sports; poles for pole vaulting; starting blocks for sports; bob-sleighs; skis; edges of skis; bags especially designed for skis and surfboards; scrapers for skis; sole coverings for skis; ski bindings; ice skates; snowshoes; snowboards; punching bags; boxing gloves; archery implements; fencing masks; fencing gauntlets; fencing weapons; appliances for gymnastics; body-training apparatus; water wings; mens athletic supporters sports articles; swimming kick boards; twirling batons; paragliders; hang gliders; bodyboards; rosin used by athletes; roller skates; skateboards; swings (sports articles); ascenders mountaineering equipment; climbers harness; flippers for swimming; surfboards; surfboard leashes; waterskis; surf skis; sailboards; harness for sailboards; masts for sailboards; fishing tackle; butterfly nets. Arranging and conducting of concerts; organization of film showings; film production, other than advertising films; subtitling; scriptwriting services; theatre productions; orchestra services; providing on-line music, not downloadable; circuses; production of radio and television programmes; movie studios; recording studio services; amusement parks; music-halls.