Results 171 to 180 of about 2,822 (222)
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Calibration of Pd-porphyrin phosphorescence for oxygen concentration measurements in vivo
Journal of Applied Physiology, 1996Sinaasappel, M., and C. Ince. Calibration of Pd-porphyrin phosphorescence for oxygen concentration measurements in vivo. J. Appl. Physiol. 81(5): 2297–2303, 1996.—Quantitative measurement of oxygen concentrations in the microvasculature is of prime importance in issues related to oxygen transport to tissue.
Sinaasappel, M., Ince, C.
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Preparation and calibration of ultrathin Zn layers on Pd(111)
Applied Surface Science, 2009Abstract The general assumption that metal vapors stick at any surface with probability one at room temperature is a necessary requirement for the correct metal deposition rate determination by quartz microbalance measurements. In a combined thermal desorption spectroscopy (TDS) and Auger electron spectroscopy (AES) study on clean and sulphur covered
M. Kratzer +4 more
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Investigation of Pd–C cells to improve thermocouple calibration
Metrologia, 2011An intercomparison of the melting temperatures of four Pd–C eutectic fixed-point cells was performed using four Pt/Pd thermocouples. The cells are designed for the calibration of thermocouples and were constructed in the participating laboratories of NPL, LNE, NMIJ and PTB. The measurements were performed in four different high-temperature furnaces but
J V Pearce +5 more
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Computation of PD calibration reflectograms in shielded power cable
IEEE Transactions on Dielectrics and Electrical Insulation, 2008The basis for computing PD calibration reflectograms in shielded power cable is presented. The computed reflectograms include the effects of cable attenuation, initial pulse width, cable length, and PD detection bandwidth. The authors have developed a program based on the algorithms presented in this paper which they are making freely available to the ...
Naima Oussalah, Steven Boggs
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Influence quantities in the calibration of PD calibrators contribution to the uncertainty estimate
11th International Symposium on High-Voltage Engineering (ISH 99), 1999The numerical integration of the current pulse delivered from a PD calibrator is the easiest way to carry out a performance test of the calibrator itself by using readily available experimental apparatus. The paper discusses the role and the relative importance of the various influence quantities which intervene in the measurement and can contribute to
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On the Use of the Co–C Fixed Point for Calibration of Pt/Pd Thermocouples
International Journal of Thermophysics, 2008At INRIM, different Co–C fixed-point cells have been constructed and investigated. Two cells of different design and volume and filled with highly pure cobalt (99.998%) were used to extend the fixed-point calibration of five Pt/Pd thermocouples that had been previously calibrated at the triple point of water and at the fixed points of In, Sn, Zn, Al ...
ASTRUA, MILENA +2 more
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A novel calibration method for PD measurements in power cables and joints using capacitive couplers [PDF]
Measurement Science and Technology, 2004 Partial discharge (PD) measurements are universally accepted as a technique giving some indication of the state of the insulation in high-voltage apparatus. Cable end users are keen to adopt online PD monitoring during commissioning of systems. However, because of noisy environments and the problems of interference the conventional methods are ...
Zhong, L, Chen, G, Xu, Y
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The effectiveness assessment of calibration and measurement of PD apparent charge quantity
2013 IEEE Electrical Insulation Conference (EIC), 2013In the Partial Discharge (PD) measurement on transformer, the discharge quantity is calculated from the offline calibration. The calibrating waveform is standardized by IEC 60270:2000 with a rise time 6 MHz. But the PD measuring instruments in use are standardized by the same document with an up-band frequency less than 500 kHz. Most of the energy is
Hongjing Liu +8 more
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Calibration of capacitive couplers for online PD detection in HV cables
IEEE Electrical Insulation Magazine, 2005Possible online quantification and calibration methods for capacitive couplers have been investigated experimentally. The purpose of the calibration is to ensure that if two different systems are used to measure the same sample, they measure the same "apparent PD magnitude," which is the charge transfer at the sample electrodes.
Wang, P., Lewin, P.L., Sutton, S.J.
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Possibility of PD calibration on power transformers using UHF probes
IEEE Transactions on Dielectrics and Electrical Insulation, 2017Partial Discharge (PD) measurement on power transformers using Ultra-High Frequency (UHF) techniques has great advantages on IEC method including possibility of online application, localization and greater immunity against external noises. But lacking a method to calibrate or at least determine sensitivity of UHF method for power transformers is the ...
H. Jahangir +3 more
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