The Experts below are selected from a list of 309 Experts worldwide ranked by ideXlab platform
Steve G. Roberts - One of the best experts on this subject based on the ideXlab platform.
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Gas Pressure sintering of Al2O3/TiCN composite
Ceramics International, 2005Co-Authors: Haitao Yang, Steve G. RobertsAbstract:Abstract Al 2 O 3 /TiCN composites have been fabricated by Gas Pressure sintering, which overcomes the limitations of hot pressing. The densification behavior and mechanical properties of the Al 2 O 3 Gas Pressure sintered with 30 wt.% TiCN at different temperatures have been investigated. The Gas Pressure sintered Al 2 O 3 –30 wt.%TiCN composite achieved a relative density of 99.5%, a bending strength of 772 MPa, a hardness of 19.6 GPa, and a fracture toughness of 5.82 MPa·M 1/2 .
Y M Liu - One of the best experts on this subject based on the ideXlab platform.
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fiber fabry perot interferometer for measurement of Gas Pressure and temperature
Journal of Lightwave Technology, 2016Co-Authors: Bijie Xu, Y M Liu, D N Wang, J Q LiAbstract:A fiber Fabry–Perot interferometer (FPI) is proposed and demonstrated for the measurement of Gas Pressure and temperature. The interferometer is fabricated by fusion splicing a short segment of capillary tube to a standard single mode fiber (SMF), followed by inserting a glass microsphere into the tube, the air gap between the SMF end face and the glass microsphere then forms a fiber FPI. Due to the additional reflection occurred on the rear surfaces of the microsphere, the reflection spectrum of the device is a three-beam interference pattern. Owing to the dependence of refractive index of Gas on the Pressure applied and the thermal-optical effect of glass microsphere, different dips in the interference fringe pattern exhibit different responses to the changes in Gas Pressure and temperature, which enables a simultaneous Gas Pressure and temperature sensing. The proposed device has the advantages of compact size, robust structure, easy fabrication, high Gas Pressure sensitivity, and supporting of range tunable operation.
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Fiber Fabry–Pérot Interferometer for Measurement of Gas Pressure and Temperature
Journal of Lightwave Technology, 2016Co-Authors: Y M Liu, Daodang WangAbstract:A fiber Fabry–Perot interferometer (FPI) is proposed and demonstrated for the measurement of Gas Pressure and temperature. The interferometer is fabricated by fusion splicing a short segment of capillary tube to a standard single mode fiber (SMF), followed by inserting a glass microsphere into the tube, the air gap between the SMF end face and the glass microsphere then forms a fiber FPI. Due to the additional reflection occurred on the rear surfaces of the microsphere, the reflection spectrum of the device is a three-beam interference pattern. Owing to the dependence of refractive index of Gas on the Pressure applied and the thermal-optical effect of glass microsphere, different dips in the interference fringe pattern exhibit different responses to the changes in Gas Pressure and temperature, which enables a simultaneous Gas Pressure and temperature sensing. The proposed device has the advantages of compact size, robust structure, easy fabrication, high Gas Pressure sensitivity, and supporting of range tunable operation.
K. Ueyama - One of the best experts on this subject based on the ideXlab platform.
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NEW QUALITY INSPECTION METHOD FOR Gas Pressure WELDS
Quarterly Report of Rtri, 2002Co-Authors: Yamamoto Ryuichi, Y. Fukada, M. Tatsumi, K. UeyamaAbstract:In Japan, a majority of steel bars are welded by the Gas Pressure welding because it is superior to other joining methods in workability. In the Hyogoken-Nanbu earthquake on January 17, 1995, a number of Gas Pressure welds in reinforced concrete members were fractured at the weld interface. Since then, a reliable quality inspection method has strongly been demanded. A method of "flash removal by hot shearing," which makes it possible to easily inspect the weld immediately after welding, has been recently developed. This method is effective in evaluating Gas Pressure welds in real time, and it possesses high workability and high reliability. The reliability of inspection method, such as penetrant test, ultrasonic test and flash removal by hot shearing method, was verified by tensile and bending tests of welded joints. After that, the relation between the inspection results and the destructive test results was investigated. As a result, it was clear that flash removal by hot shearing method has the highest reliability. Thus, flash removal by hot shearing method is superior to penetrant testing and ultrasonic testing as a quality inspection method for Gas Pressure welds.
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Gas Pressure welding method for steel reinforcing bars
Welding Journal, 1998Co-Authors: R. Yamamoto, Y. Fukada, K. Ueyama, M. Tatsumi, H. OishibashiAbstract:In Japan, the majority of steel bars are welded by Gas Pressure welding. This is because Gas Pressure welding is superior to other joining methods in its workability. In the Hanshin-Awaji earthquake of January 17, 1995, many Gas Pressure welds in reinforced concrete were broken at the weld interface. Since then, a reliable quality inspection method has been demanded. A method of flash removal by hot shearing, which makes it possible to easily inspect the weld immediately after welding, has been recently developed. This method is effective in evaluating Gas Pressure welds in real time, and it possesses high workability and high reliability. The reliability of inspection methods, such as penetrant testing, ultrasonic testing and flash removal by hot shearing, was verified by tensile and bending tests of welded joints. Then the relation between the inspection results and the destructive testing results was investigated. As a result, it was clear that flash removal by the hot shearing method displayed the highest reliability. Thus, flash removal by hot shearing is superior to penetrant testing and ultrasonic testing as a quality inspection method for Gas Pressure welds.
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Fundamental examinations for quality evaluation of Gas Pressure welds: Non‐destructive inspection method for Gas Pressure welds with bulge removal by hot shearing (1st Report)
Welding International, 1996Co-Authors: H. Oishibashi, K. UeyamaAbstract:Summary The authors have given serious consideration to key problems facing quality evaluation of Gas Pressure welds and have developed a non‐destructive method for 100% quality inspection of Gas Pressure welds just after welding has been performed. The method is based on bulge removal by hot shearing. The present paper describes the results obtained during quality evaluation of Gas Pressure welds based on this method. The results obtained may be summarised as follows: The quality (joint interfacial strength and properties) of steel Gas Pressure welds is controlled by the area expansion factor of the Gas Pressure welds and Gas Pressure welding temperature. Within the range avoiding any melting of the surfaces being welded, the quality improves with increasing values of both factors. The quality of Gas Pressure welds can be evaluated by whether or not flat fracture occurs on the fracture surface under mechanical test and its proportion. The effects of the area expansion factor and Gas Pressure welding temp...
Daqing Tang - One of the best experts on this subject based on the ideXlab platform.
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fiber loop ring down optical fiber grating Gas Pressure sensor
Optics and Lasers in Engineering, 2010Co-Authors: Daqing Tang, Dexing Yang, Yajun Jiang, Jianlin Zhao, Haiyan Wang, Shiquan JiangAbstract:Abstract A kind of bare fiber Bragg grating (FBG) Gas Pressure sensor based on fiber loop ring-down is presented, in which there are no sensitizing means or assistant structure on the bare FBG. The Pressure sensitivity is analyzed theoretically via discussing the relationship between the ring-down time and the Gas Pressure. By detecting the ring-down time at different Gas Pressure levels, the Gas Pressure characteristics of the bare FBG are investigated in the time domain. The experimental results demonstrate that there exists a linear dependence of the Pressure applied to the bare FBG on the ring-down time. A high sensitivity of −0.384 μs/MPa (being equivalent to −240 pm/MPa) could be achieved, which is 79 times larger than that of the optical spectral analyzer interrogated. This kind of Pressure sensor could be used for Gas or liquid Pressure measurement.
Feng Zhang - One of the best experts on this subject based on the ideXlab platform.
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nano silica diaphragm in fiber cavity for Gas Pressure measurement
Scientific Reports, 2017Co-Authors: Shen Liu, Yiping Wang, Changrui Liao, Ying Wang, Kaiming Yang, Zhiyong Bai, Feng ZhangAbstract:We demonstrate an ultrahigh-sensitivity Gas Pressure sensor based on the Fabry-Perot interferometer employing a fiber-tip diaphragm-sealed cavity. The cavity is comprised of a silica capillary and ultrathin silica diaphragm with a thickness of 170 nm, with represents the thinnest silica diaphragm fabricated thus far by an electrical arc discharge technique. The resulting Fabry-Perot interferometer-based Gas Pressure sensor demonstrates a Gas Pressure sensitivity of about 12.22 nm/kPa, which is more than two orders of magnitude greater than that of a similarly configured fiber-tip air bubble sensor. Moreover, our Gas Pressure sensor has a low temperature cross-sensitivity of about 106 Pa/°C, and the sensor functions well up to a temperature of about 1000 °C. As such, the sensor can potentially be employed in high-temperature environments.
