Shimizu Corporation is a leading architectural, civil engineering and general contracting firm, offering an integrated, comprehensive planning, design and build solutions for a broad range of construction and engineering projects worldwide. It has annual sales of approximately US $15 billion and has been widely recognized as one of the top 5 contractors in Japan and among the top 20 in the world. Wikipedia.
Kimura M.,Shimizu Corporation
Journal of the Acoustical Society of America | Year: 2013
The reported compressional wave speed dispersion and attenuation could be explained by a modified gap stiffness model incorporated into the Biot model (the BIMGS model). In contrast, shear wave speed dispersion and attenuation have not been investigated in detail. No measurements of shear wave speed dispersion have been reported, and only Brunson's data provide the frequency characteristics of shear wave attenuation. In this study, Brunson's attenuation measurements are compared to predictions using the Biot-Stoll model and the BIMGS model. It is shown that the BIMGS model accurately predicts the frequency dependence of shear wave attenuation. Then, the shear wave speed dispersion and attenuation in water-saturated silica sand are measured in the frequency range of 4-20 kHz. The vertical stress applied to the sample is 17.6 kPa. The temperature of the sample is set to be 5 °C, 20°C, and 35°C in order to change the relaxation frequency in the BIMGS model. The measured results are compared with those calculated using the Biot-Stoll model and the BIMGS model. It is shown that the shear wave speed dispersion and attenuation are predicted accurately by using the BIMGS model. © 2013 Acoustical Society of America. Source
Kimura M.,Shimizu Corporation
Journal of the Acoustical Society of America | Year: 2011
The large velocity dispersion recently reported could be explained by a gap stiffness model incorporated into the Biot model (the BIMGS model) proposed by the author. However, at high frequencies, some measured results have been reported for negative velocity dispersion and attenuation proportional to the first to fourth power of frequency. In this study, first, it is shown that the results of velocity dispersion and attenuation calculated using the BIMGS model are consistent with the results measured in two kinds of water-saturated sands with different grain sizes, except in the high-frequency range. Then, the velocity dispersion and attenuation in six kinds of water-saturated glass beads and four kinds of water-saturated silica sands with different grain sizes are measured in the frequency ranges of 80-140 and 300-700 kHz. The measured results are compared with those calculated using the BIMGS model plus some acoustic models. It is shown that the velocity dispersion and attenuation are well predicted by using the BIMGS model in the range of kd 0.5 (k: wavenumber in water, d: grain diameter) and by using the BIMGS model plus multiple scattering effects in the range of kd 0.5 in which negative velocity dispersion appears. © 2011 Acoustical Society of America. Source
Shimizu Corporation | Date: 2011-03-11
An operation management apparatus includes an air conditioning thermal load prediction unit configured to calculate an air conditioning thermal load predicted value indicating a predicted amount of heat required to adjust temperature to a pre-set temperature on a day-of-prediction, a power generation output prediction processing unit configured to calculate power generation output prediction data indicating a generated power obtained by a generator within the day-of-prediction, and an operation planning unit configured to prepare an air conditioning heat source operation plan, and determines a purchased power and the generated power using the power generation output prediction data to thereby prepare a power facility operation plan indicating a schedule of a power output from the purchased power source and the generator, so that the purchased power per predetermined time supplied from a purchased power source of a commercial power system becomes a target value.
Shimizu Corporation and University of Tokyo | Date: 2010-03-16
A control method of the present invention is a control method for distributed power sources which systematically controls a plurality of distributed power sources having different responsive capabilities for a load disturbance. The distributed power sources include an electricity storage device. The control method of the present invention includes: obtaining a component to be compensated for using a power source having a responsive capability equal to or lower than that of the electricity storage device based on a difference value between a remaining capacity of the electricity storage device and a target remaining capacity; and compensating for the component to be compensated for using the power source having a responsive capability equal to or lower than that of the electricity storage device.
Shimizu Corporation | Date: 2014-01-28
Disclosed is a composition for supplying dietary fiber to food and drink and/or for improving quality of food and drink, which includes a partially hydrolyzed substance of glucomannan. This partially hydrolyzed substance of glucomannan has a viscosity in a 1% aqueous solution which is in a range of 1,000 to 10,000 mPas and a weight average molecular weight which is in a range of 100,000 to 800,000. Because an aqueous solution thereof is lowly viscous, not only the composition can be added to food and drink, in a comparatively high concentration, but also upon adding the composition to an emulsified food such as an ice cream, even by heating, a shape of the food before heating can be retained.