Tanaka H.,Kurume Institute of Technology
Desalination | Year: 2016
In this study, a combination of vertical multiple-effect diffusion solar still and tilted wick still is proposed and theoretically analyzed. The vertical multiple-effect diffusion still consists of a double glass cover and a number of vertical and parallel partitions in contact with saline-soaked wicks with narrow air gaps between the partitions. The moisture-rich layers of air in the tilted wick still and the multiple-effect still are connected so that the vapor evaporated from the wick of the tilted wick still can be transported to the humid air layer between the inner glass cover and the first partition of the multiple-effect still by natural convection. The latent heat of condensation of the vapor on the front surface of the first partition can be utilized as an added heat source for the multiple-effect still. It was found that solar energy utilized in the multiple-effect still would be adequate year-round. The total daily distillate production was predicted to be about 19.2, 16.0 and 15.9kg/m2day on the spring equinox and summer and winter solstices, respectively, when the diffusion gaps between partitions is 5mm and the number of partitions is 10. © 2015 Elsevier B.V.
Oomi G.,Kurume Institute of Technology
Review of High Pressure Science and Technology/Koatsuryoku No Kagaku To Gijutsu | Year: 2013
A versatile high-pressure apparatus has been constructed to measure the electronic, magnetic and thermal properties of metals, alloys and compounds at low temperature and high magnetic field. A pressure-induced crossover from heavy fermion to intermediate valence state and pressure-induced superconductivity are reported for some intermetallic compounds including f electrons. The effect of pressure on the giant magnetoresistance (GMR) for nanoscale magnetic materials is described. The enhancement of GMR is found at high pressure. The Compton scattering at high pressure is also reported as an interesting topic.
Tanaka H.,Kurume Institute of Technology
Alexandria Engineering Journal | Year: 2016
A thermal distillation system utilizing a part of the thermal energy of biomass burned in a stove during cooking is proposed. The thermal energy is transported from the stove to the distiller by means of a heat pipe. The distiller is a vertical multiple-effect diffusion distiller, in which a number of parallel partitions in contact with saline-soaked wicks are set vertically with narrow gaps of air. A pilot experimental apparatus was constructed and tested with a single-effect and multiple-effect distillers to investigate primarily whether a heat pipe can transport thermal energy adequately from the stove to the distiller. It was found that the temperatures of the heated plate and the first partition of the distiller reached to about 100. °C and 90. °C, respectively, at steady state, showing that the heat pipe works sufficiently. The distilled water obtained was about 0.75 and 1.35. kg during the first 2. h of burning from a single-effect and multiple-effect distillers, respectively. © 2016 Faculty of Engineering, Alexandria University.
Inoue T.,Kurume Institute of Technology |
Monde M.,Saga University
International Journal of Heat and Mass Transfer | Year: 2012
Nucleate pool boiling heat transfer coefficients of ammonia/water mixtures were measured at a pressure of 0.4 MPa on a horizontal heated fine wire having a diameter of 0.3 mm. The nucleate pool boiling aspects were observed, after the addition of a surface-active agent to the mixtures. The effects of the concentrations of ammonia and the surface-active agent on the coefficients were clarified experimentally for the ammonia fraction range 0.1 ≦ C ≦ 0.9 and surfactant concentration range 0 ≦ C S ≦ 3500 ppm. The results showed that the coefficients were enhanced at C ≦ 0.5 and in low heat flux ranges just after the onset of boiling. It was also found that the enhancement effect caused by the surfactant disappeared at surfactant concentrations of more than 1000 or 1500 ppm. © 2012 Elsevier Ltd. All rights reserved.
Yamaguchi T.,Kurume Institute of Technology |
Aoyagi Y.,New Ace Institute Co Ltd |
Osada H.,New Ace Institute Co Ltd |
Shimada K.,New Ace Institute Co Ltd |
Uchida N.,New Ace Institute Co Ltd
SAE International Journal of Engines | Year: 2013
In heavy duty diesel engines, waste heat recovery systems are remarkable means for fuel consumption improvement. In this paper, Diesel-Rankine combined cycle which is combined diesel cycle with Rankine cycle is studied to clarify the quantitative potential of fuel consumption improvement with a high EGR rate and high boosted diesel engine. The high EGR rate and high boosted diesel engine of a single cylinder research engine was used and it reaches brake specific fuel consumption (BSFC) of 193.3 g/kWh at full load (BMEP=2.0MPa). And its exhaust temperature reaches 370 C. The exhaust gas temperature does not exceed 400 C in high boosted diesel engine even at full load operating condition because of a high excess air ratio. On the other hand, exhaust gas quantity is larger due to a high boosting. So, it is estimated that the thermal energy of exhaust gas is enough for recovery in the high boosted diesel engine, although exhaust gas temperature is not so higher than that of an ordinary diesel engine. In the heat balance of the high boosted research diesel engine at medium engine speed, the exhaust loss is 38 % at full load. From this result, it is possible to recover the exhaust gas energy, when engine is operated above medium load condition. In this predictive study, water, methanol, toluene, HCFC-123, R134a and R245fa are compared as working fluid in Rankine cycle with superheating. As a result of this study, it is found that Diesel-Rankine combined cycle has a potential to improve BSFC for 2.6 - 3.0 % at full load condition. Copyright © 2013 SAE International.
Fukuda K.,Kurume Institute of Technology
Society and Animals | Year: 2016
This article describes how livestock farmers respond to moral enquiries about their means of livelihood, by referring to ethnographic data collected in the Scottish Borders. The focus is on three controversial aspects of livestock farming: welfare issues of intensive farming methods, guilt about depriving nonhuman animals of their lives for food, and the moral dilemma of breeding and rearing animals merely to be killed. There was a feeling of uneasiness among farmers about sending the animals they looked after to the slaughterhouse. This, however, was rationalized with the recognition that livestock were bred and reared to be eaten in the first place. By examining farmers' utterances, it is suggested that livestock farmers are conditioned to consider their vocation as a part of the social system, over which they have little control. © 2016 Koninklijke Brill NV, Leiden, The Netherlands.
Ishi-I T.,Kurume Institute of Technology
Yuki Gosei Kagaku Kyokaishi/Journal of Synthetic Organic Chemistry | Year: 2016
This review describes the systematic study on the red light-emitting behavior of a series of donor-acceptor-type dyes containing a strong acceptor moiety such as benzothiadiazole, naphtho-bisthiadiazole, bisthiadiazoloquinoxaline, and hexaazatriphenylene. Donor-acceptor conjugation is one of the simplest strategies for generating longer-wavelength emissions including red light emission. With the increase in the strength of donor-acceptor conjugates, the emission band shifts bathochromically, producing red light emission. However, the efficiency of red light emission decreases to show the quenching in polar aqueous media, because a highly polarized excited state arising from the donor-acceptor characteristic increases the formation of a nonradiative deactivation channel. An efficient red light emission can be achieved in the aggregation of the donor-acceptor dyes even in polar aqueous media. The formed aggregate provides a less polar hydrophobic space inside the aggregate structure, by which the quenching is restricted, leading to the reduction of the nonradiative deactivation rate.
Ichimasa R.,Kyushu University |
Nakamura R.,Kyushu University |
Nakamura R.,Kurume Institute of Technology |
Hashimoto M.,Kyushu University |
Arai K.,Kumamoto University
Physical Review D - Particles, Fields, Gravitation and Cosmology | Year: 2014
Comparing the latest observed abundances of He4 and D, we make a χ2 analysis to see whether it is possible to reconcile primordial nucleosynthesis using the up-to-date nuclear data of NACRE II and the mean life of neutrons. If we adopt the observational data of He4 by Izotov et al. [Astron. Astrophys. 558, A57 (2013)], we find that it is impossible to get a reasonable agreement with the standard big-bang nucleosynthesis. However, by including degenerate neutrinos, we succeed in obtaining consistent constraints between the neutrino degeneracy and the baryon-to-photon ratio from a detailed comparison of calculated abundances with the observational data of He4 and D: the baryon-to-photon ratio in units of 10-10 is found to be in the range 6.02η10 6.54 for the specified parameters of neutrino degeneracy. © 2014 American Physical Society.
Fukushima K.,Kurume Institute of Technology |
Matsushima K.,Kurume Institute of Technology
2015 IEEE International Conference on Vehicular Electronics and Safety, ICVES 2015 | Year: 2015
Many researches have worked for the development of automotive technologies, so as to realize a convenient and safety automotive society such as Advanced Safety Vehicle (ASV) and Traffic Monitoring System (TMS). As a result, traffic accidents have decreased as the years pass, and the number of the dead and injuries have been reduced. However, autonomous driving is not only required to detect bicycles around vehicles, but also expected to understand the behaviors of bicycles. In addition, since the proportion of bicycle accident shows a high percentage in the total traffic accident, it has been predicted an increase of the accident of the bicycle in the future. Therefore we propose a multi-directional bicycle recognition system using the distance information obtained by the stereo camera. In the proposed system, we divide the moving direction of the bicycle into three directions. In addition, we propose a robust feature extraction method on rotation in order to cope with the bicycle between each direction. Finally, we show the experimental results and verify the effectiveness of the proposed method. © 2015 IEEE.
Ide J.-Y.,Kurume Institute of Technology
European Journal of Entomology | Year: 2014
Mated females of the small copper butterfly Lycaena phlaeas avoid harassment by males by closing their wings and concealing themselves when in the proximity of a con-specific butterfly. This wing-closing behaviour is less frequently exhibited by virgin females that are two days old or older (i.e., potentially receptive) than by mated females. During the first 2 days after emergence, females of L. phlaeas are sexually immature and unreceptive. To determine whether recently emerged virgin females try to avoid male harassment, age-related changes in the frequency of harassment-avoidance behaviour of virgin females were investigated. On the day of emergence, a high percentage of virgin females exhibited wing-closing behaviour. Over the following 2 days, however, the frequency of this behaviour declined sharply and then reached a constant low level. This observation supports the idea that the harassmentavoidance behaviour exhibited by virgin females of L. phlaeas depends on their receptivity.