Search Results - "KAJIKAWA, Hiroaki"

An attempt to measure fluctuations of atmospheric pressure with laser interferometer by Iizumi, Hideaki, Kajikawa, Hiroaki

“…Fluctuations of atmospheric pressure caused by natural disasters have been observed in various parts of Japan. However, the evaluation method for the dynamic…”
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Estimation of Calibration Values of Quartz Bourdon-Type Pressure Transducers Using Various Gases by Iizumi, Hideaki, Kajikawa, Hiroaki, Kobata, Tokihiko

“…Quartz Bourdon-type pressure transducers are used as a secondary standard for high-pressure precision measurements. Such a transducer's calibration value…”
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Effect of surrounding temperature on long-term drift of quartz Bourdon-type pressure gauges kept at constant pressure by Kajikawa, Hiroaki, Iizumi, Hideaki, Kobata, Tokihiko

“…We have been investigating the long-term drift of pressure gauges under constant pressure application with the aim to improve the precision of pressure…”
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Sound velocity and attenuation in the semiconductor-metal transition region of fluid selenium by KAJIKAWA, Hiroaki, TAKAHASHI, Shin, IWAKOSHI, Masaki, HOSHINO, Taiki, YAO, Makoto

“…We have measured the sound velocity, v, and sound attenuation, α, in fluid selenium up to 1700 °C and 1666 bar including the semiconductor-metal (SC-M)…”
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Precise sound velocity measurement for liquid Se50Te50 under high pressure by Kajikawa, Hiroaki, Kobayashi, Keisuke, Hiejima, Yusuke, Hoshino, Taiki, Yao, Makoto

“…We have measured the sound velocity in liquid Se50Te50 at 19.5, 32.6, 45.6, and 58.2MHz simultaneously by means of an ultrasonic pulse transmission/echo…”
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Evaluation and correction for long-term drift of hydraulic pressure gauges monitoring stable and constant pressures by Kajikawa, Hiroaki, Kobata, Tokihiko

“…•The long-term drift of pressure gauges under constant high pressure was evaluated.•Calibration values under 100 MPa application have been traced for…”
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Development of a system for measuring head differential pressure and density of working fluid at high pressures by Kobata, Tokihiko, Kajikawa, Hiroaki

“…•A system for accurately measuring head differential pressure.•Head differential pressure is obtained from pressures measured at two levels.•Two levels whose…”
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Electron-ion-coincidence measurements for K-shell excited free krypton clusters by NAGAYA, Kiyonobu, YAO, Makoto, MURAKAMI, Hitoshi, MORI, Arata, OHMASA, Yoshinori, KAJIKAWA, Hiroaki

“…The decay processes of inner-core excited krypton atom and free krypton clusters up to {N}=1640, {N} being the average cluster size, have been studied by means…”
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Effect of the kind of gas medium on calibration values of high gas pressure transducers by Iizumi, Hideaki, Kajikawa, Hiroaki, Kobata, Tokihiko

“…•Calibration values of pressure transducers are affected by the kind of gas medium.•Setting posture of the transducer also causes a change in the calibration…”
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A high gas pressure calibration system using a liquid-lubricated pressure balance by Iizumi, Hideaki, Kajikawa, Hiroaki, Kobata, Tokihiko

“…•A high gas pressure calibration system up to 100MPa has been developed.•A liquid-lubricated pressure balance was calibrated by hydraulic pressure…”
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Development of remote calibration system for pressure standard by Kobata, Tokihiko, Kojima, Momoko, Kajikawa, Hiroaki

“…► A remote calibration technology for disseminating pressure standard. ► Integrated transfer standards were newly developed. ► Calibration protocol for the…”
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Method for altering deformational characteristics of controlled-clearance piston-cylinders by Kajikawa, Hiroaki, Ide, Kazunori, Kobata, Tokihiko

“…A new controlled-clearance pressure balance has been developed to improve the hydraulic pressure standard for pressures up to 1 GPa. For several…”
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A precursor of liquid–liquid coexistence in the metal–nonmetal transition range of fluid mercury by Kobayashi, Keisuke, Kajikawa, Hiroaki, Hiejima, Yusuke, Hoshino, Taiki, Yao, Makoto

“…We have carried out precise measurements of sound velocity c for fluid mercury at high temperatures and high pressures. The temperature coefficient of the…”
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Density measurement of pressure transmitting oil at high pressures up to 100 MPa by changing the vertical position of a precise pressure gauge by Kajikawa, Hiroaki, Kobata, Tokihiko

“…This paper presents a method of on-site density measurement of pressure transmitting medium at high pressures. The density is estimated by precisely detecting…”
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Effects of setting attitude of high gas pressure gauge on calibrated values by Iizumi, Hideaki, Kajikawa, Hiroaki, Kobata, Tokihiko

“…For high gas pressure measurements, a quartz Bourdon-type pressure gauge is one of the highest precision pressure gauges. Setting attitude of the pressure…”
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Long-term evaluation of effective area ratio of pressure balances by Kobata, Tokihiko, Kojima, Momoko, Kajikawa, Hiroaki

“…A pressure balance is a device that is implemented directly from the basis of the definition of pressure and can be used as a pressure standard. Its main…”
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Stability of pressure generated by hydraulic pressure balances in NMIJ by Kajikawa, H., Kobata, T.

“…To use a pressure balance effectively in the calibrations or experiments, the generated pressure should be kept stable for an adequate time interval. In this…”
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Uncertainty estimation of the pressure generated by the controlled-clearance pressure balance in NMIJ by Kajikawa, H., Ide, K., Kobata, T.

“…A new pressure balance with a controlled-clearance (CC) piston-cylinder has been developed with the aim of reducing the uncertainty of the pressure especially…”
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Estimation of the effective area of the controlled-clearance pressure balance for pressures up to 500 MPa by Kajikawa, H., Ide, K., Kobata, T.

“…We are now developing a new controlled-clearance (CC) pressure balance with the aim of improving the hydraulic pressure standard. The effective areas of the…”
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Development of a new controlled-clearance pressure balance for hydraulic high-pressure standard by Kajikawa, H., Kobata, T., Ooiwa, A.

“…We are developing a new controlled-clearance pressure balance aiming to upgrade the hydraulic high-pressure standard up to 1 GPa. This new pressure balance…”
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