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Sapporo, Japan

The Hokkaido Electric Power Company , or Hokuden for short, is the monopoly electric company of Hokkaidō, Japan. It is also known as Hokuden, Dōden, and HEPCO. The company is traded on the Tokyo Stock Exchange , Osaka Securities Exchange , and Sapporo Securities Exchange. According to the company profile, during fiscal 2011 , 26% of the electricity generated was from nuclear, 31% from coal, 15% from hydro, 8% from oil and 2% from 'new energy' sources.Hokkaido only has one nuclear power station, the Tomari Nuclear Power Plant. Wikipedia.

Murakami C.,Hokkaido University | Ishikuro Y.,Hokkaido Electric Power Co. | Takahashi M.,Hokkaido University
BioMedical Engineering Online | Year: 2012

Background: The objective of our study was to develop a novel capacitive force sensor that enables simultaneous measurements of yaw torque around the pressure axis and normal force and shear forces at a single point for the purpose of elucidating pressure ulcer pathogenesis and establishing criteria for selection of cushions and mattresses.Methods: Two newly developed sensors (approximately 10 mm×10 mm×5 mm (10) and 20 mm×20 mm×5 mm (20)) were constructed from silicone gel and four upper and lower electrodes. The upper and lower electrodes had sixteen combinations that had the function as capacitors of parallel plate type. The full scale (FS) ranges of force/torque were defined as 0-1.5 N, -0.5-0.5 N and -1.5-1.5 N mm (10) and 0-8.7 N, -2.9-2.9 N and -16.8-16.8 N mm (20) in normal force, shear forces and yaw torque, respectively. The capacitances of sixteen capacitors were measured by an LCR meter (AC1V, 100 kHz) when displacements corresponding to four degrees of freedom (DOF) forces within FS ranges were applied to the sensor. The measurement was repeated three times in each displacement condition (10 only). Force/torque were calculated by corrected capacitance and were evaluated by comparison to theoretical values and standard normal force measured by an universal tester.Results: In measurements of capacitance, the coefficient of variation was 3.23% (10). The Maximum FS errors of estimated force/torque were less than or equal to 10.1 (10) and 16.4% (20), respectively. The standard normal forces were approximately 1.5 (10) and 9.4 N (20) when pressure displacements were 3 (10) and 2 mm (20), respectively. The estimated normal forces were approximately 1.5 (10) and 8.6 N (10) in the same condition.Conclusions: In this study, we developed a new four DOF force sensor for measurement of force/torque that occur between the skin and a mattress. In measurement of capacitance, the repeatability was good and it was confirmed that the sensor had characteristics that enabled the correction by linear approximation for adjustment of gain and offset. In estimation of forces/torque, we considered accuracy to be within an acceptable range. © 2012 Murakami et al.; licensee BioMed Central Ltd. Source

Shimada S.,Hokkaido University | Fuji Y.,Hokkaido University | Tsujino J.,Hokkaido Electric Power Co. | Yamazaki I.,Hokkaido Sumiden Precision Industries LTD.
Surface and Coatings Technology | Year: 2010

The double-layer deposition of composite SiC-TiBC (Ti-Si-B-C) films with various Si contents (0, 40, 55, 60 and 100 mol%) on Ti-B-C was achieved from mixtures of titanium tetra-ethoxide, boron tri-ethoxide, and/or hexa-methyl-disiloxane solutions at about 700 °C on WC-Co cutting tools by Ar/H 2 thermal plasma CVD. The crystalline phases of TiB 2, TiC, and SiC were identified in the coatings by thin film grazing incidence X-ray diffraction. The surfaces and cross-sections of the double-layer coatings were observed by scanning electron microscopy to reveal their microstructure. Cutting tests of the double-layer Ti-Si-B-C/Ti-B-C were carried out by determining the flank and crater wear. The wear rate of the double-layer formed with the Ti-Si-B-C composite over-layer with 55 mol% Si was the slowest of the five samples. In addition, the effect of surface roughnesses (Ra (μm) = 0.03, 0.20 and 0.55) on the coating and wear resistance of the double-layer Ti-Si-B-C/Ti-B-C with 55 mol% Si was investigated by cross-sectional SEM observation and cutting tests. © 2009 Elsevier B.V. All rights reserved. Source

Shimada S.,Hokkaido University | Sakamoto T.,Hokkaido University | Tsujino J.,Hokkaido Electric Power Co. | Yamazaki I.,Hokkaido Sumiden Precision Industries LTD.
Surface and Coatings Technology | Year: 2010

Double-layer TiN/PSZ coatings approximately 2 μm thick were deposited on Si wafers and WC-Co cutting tools from Ti-, Zr-, and Y-alkoxide solutions by Ar/H2/N2 thermal plasma chemical vapor deposition with water functioning as an oxidant. A PSZ layer was deposited on TiN films upon oxidation of Zr- and Y-alkoxides by H2O using five-step-wise and pulse-type supply methods. The double-layer coatings were characterized by X-ray diffraction, scanning electron microscopy (SEM), transmission electron microscopy (TEM), in-depth glow discharge optical emission spectrometry, and cutting tests. Two H2O supply methods, two-stage pulse and five-step-wise supply methods, were shown to be suitable for the formation of the double-layer coatings by SEM and TEM observation of surface and cross-sectional microstructures. Cutting tests for the double-layer coatings deposited on WC-Co cutting tools prepared by the above two H2O supply methods were carried out to evaluate their wear resistance. © 2010 Elsevier B.V. All rights reserved. Source

The mega-solar demonstration project named "Verification of Grid Stabilization with Large-scale PV Power Generation systems" had been completed in March 2011 at Wakkanai, the northernmost city of Japan. The major objectives of this project were to evaluate adverse impacts of large-scale PV power generation systems connected to the power grid and develop output control technologies with integrated battery storage system. This paper describes the outline and results of this project. These results show the effectiveness of battery storage system and also proposed output control methods for a large-scale PV system to ensure stable operation of power grids. NEDO, New Energy and Industrial Technology Development Organization of Japan conducted this project and HEPCO, Hokkaido Electric Power Co., Inc managed the overall project. © 2011 The Institute of Electrical Engineers of Japan. Source

Nakano D.,Japan Central Research Institute of Electric Power Industry | Tsuno M.,Hokkaido Electric Power Co.
Limnology | Year: 2016

The macroinvertebrate assemblages in an artificial habitat, the settling basin of a hydroelectric power plant, were investigated and compared with those in a natural habitat, riffles in a nearby river. This study showed that macroinvertebrate density was much higher in the settling basin than in the riffles. Macroinvertebrate assemblage composition differed between the settling basin and the riffles. The difference was probably due to the widespread bryophyte beds in the settling basin. Cincticostella, Brachycentrus, Ephmerella, and chironomid midges, which are usually abundant in bryophyte beds, were present at much higher densities in the settling basin. Cheumatopsyche and Taeniopterygidae were also present at higher densities in the settling basin than in the natural riffles. In contrast, Epeorus was present at lower density in the settling basin than in the natural riffles. This study suggests that the settling basin increases β-diversity in riverine ecosystems. © 2016 The Japanese Society of Limnology Source

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