Yonden Consultants Co.

Kagawa, Japan

Yonden Consultants Co.

Kagawa, Japan
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Mori T.,Kajima Corporation | Nakajima M.,Kajima Corporation | Sakaguchi K.,Tohoku University | Aoki S.,Yonden Consultants Co. | And 3 more authors.
ISRM International Symposium - 8th Asian Rock Mechanics Symposium, ARMS 2014 | Year: 2014

As the initial rock stress measurement technique for design of large-scale underground cavern, the Compact Conical-ended Borehole Over-coring (CCBO) technique is increasing application performance. The stress calculation model of conventional CCBO technique is based on linear elastic model. Therefore, there is a possibility of obtaining a different value compared with the true initial stress in the anisotropic rock condition. The objective of the work is to establish an initial rock stress measurement method which can be applied to anisotropic rock mass. Especially in this study, the subject is focused on frequently used anisotropic elastic rock model, the transversely isotropic model, which has one plane of transverse isotropy and one axis of rotational symmetry orthogonal to the plane. As the first step of this study, this ordinary theory of the CCBO technique is modified so as to deal with the anisotropy problems. Authors tried the application of the anisotropy theory in black schist which anisotropy is well developed, and compare with the results of isotropy model analysis in this paper. © 2014 by Japanese Committee for Rock Mechanics.

Kaneda A.,Fukui Prefectural University | Fujii N.,Saga University | Ohyama J.,Ehime University | Takahashi D.,Tohoku University | And 2 more authors.
Plankton and Benthos Research | Year: 2014

The longterm data on daily abundance of jellyfish (mostly Aurelia aurita) trapped in the intake gates of the Ikata Nuclear Power Plant on the south coast of the central part of Iyo-Nada in the Seto Inland Sea, Japan was examined for a 14-year period (April 1998 to March 2012) in relation to environmental variables, i.e. temperature, salinity, and residual current, of which the last was measured in February, May, August and November. The jellyfish abundance, expressed as wet weight, generally increased in April, reached a maximum in September, markedly decreased from October to November, and was very low or null from December to March. The annual mean jellyfish abundance varied markedly. The interannual variations in the monthly mean jellyfish abundance were not significantly correlated with water temperature or salinity in any month, while correlations with eastward velocity of the residual current in May and August were generally significantly positive. These results indicate that the jellyfish population at the study site had been introduced from the Hayasui strait about 25 km westward, where jellyfish were more abundant. Since the eastward residual current is considered as a part of the cyclonic gyre in Iyo-Nada during the warm, stratification period, it is inferred that the strength of the cyclonic gyre is the main factor affecting seasonal and interannual variations in jellyfish abundance along the south coast of Iyo-Nada. © The Plankton Society of Japan.

Hanazono S.,DAI DAN Co. | Hanazono S.,Hiroshima University | Murakawa S.,Hiroshima University | Nishina D.,Hiroshima University | And 3 more authors.
Journal of Environmental Engineering (Japan) | Year: 2013

Ventilation control system was developed and installed in an all electric center of providing school lunch. The system is able to control ventilation rate according to the change of indoor absolute humidity affected by uses of cooking appliances. The purpose of this study is to clarify the effects on the indoor thermal environment and electric energy consumption for ventilation and air conditioning by the installation of ventilation control system. From the measurements under the condition of the practical uses in the cooking room, the indoor thermal environment after the installation could be as good as it before installation. The electric energy consumption forventilation and air conditioning was reduced by the developed ventilation control system.

Shimamoto Y.,Sanki Engineering | Murakawa S.,Hiroshima University | Nishina D.,Hiroshima University | Aono M.,Shikoku Electrical Power Co. | And 3 more authors.
Journal of Environmental Engineering (Japan) | Year: 2013

All electric cooking equipments have been propagated in the center of providing school lunch. However, the ventilation rates of the facilities are well planned with the same criterions applied for the facilities equipped by gas combustion cooking ranges because we do not have definite planning standards on the ventilation rates. The purpose of this study is to clarify the effects on the indoor thermal environment and electric energy consumption for air conditioning when we control the ventilation rates in the cooking room. From the measurements based on the practical uses in the cooking room, we discuss the effects of change of the ventilation rates in comparison with the values calculated by the electric capacity of the kettles and the designed values calculated by the air change per hour; 20 circulation times applied for the cooking room.

Kondo T.,National Institute for Environmental StudiesIbaraki | Ebie Y.,National Institute for Environmental StudiesIbaraki | Kiji M.,Yonden Consultants Co. | Sugiura N.,University of TsukubaIbaraki | And 2 more authors.
Sustainable Environment Research | Year: 2011

The feasibility of the slanted soil chamber system (SSCS) for gray water treatment was conducted. The SSCS treating kitchen- and other-gray water (bath, laundry and hand wash) were installed individually in 3 individual houses in Miho village, Japan. During more than one year operation, water flow patterns of the gray water and pollutants removal efficiency were monitored. From water flow patterns, there were 2 peaks in the gray water: breakfast in the morning and supper time in the evening for kitchen-gray water and other-gray water (laundry in the morning and bath in the evening). The water volume of other-gray water was 3.3-3.8 times higher than kitchen-gray water. Suspended solids (SS) was effectively removed in all SSCSs; however, SS was accumulated on the soil in winter season. Annual renewal or replacement of chambers is necessary. Biochemical oxygen demand, total nitrogen and total phosphorus removal efficiencies were affected not only by water volume but also by ambient temperature. In conclusion, SSCSs used in this study achieved high nutrient removal efficiency when the water volume was set at below 40 L m-2. © 2011, Chinese Institute of Environmental Engineering. All rights reserved.

Terai A.,Kyoto University | Yamamoto F.,YONDEN CONSULTANTS CO. INC. | Ohashi T.,HydroWorks Co. | Toyohara H.,Kyoto University
Nippon Suisan Gakkaishi (Japanese Edition) | Year: 2011

With the aim of utilizing the oyster shells which are generally discarded in shell culture, we have developed an efficient precipitator to clarify muddy water from a baked oyster shell. We examined the effect of baking temperature (200°C, 300°C, 400°C, 500°C, and 600°C) on the effect of precipitation and found that 400°C was the most effective baking temperature to produce a precipitator. The efficiency of precipitation was evaluated as the precipitation ability of the baked shell in muddy water containing kaolin. Precipitators made of shell baked at temperatures below 300°Cwere more efficient under slowstirring conditions, while those baked at temperatures above 500°Cwere more effective under fast stirring conditions.Precipitators made of shell baked at 400°C were effective under both stirring conditions. The specific surface area and grain size of the shell reduced with the increase in baking temperature. This is possibly because 400°C is a suitable baking temperature for both generating the small grain size that is effective for flock formation and realizing a large specific surface area necessary for the physical strength of the flock.

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