The Experts below are selected from a list of 219 Experts worldwide ranked by ideXlab platform
Selker J.s. - One of the best experts on this subject based on the ideXlab platform.
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Mapping variability of soil water content and flux across 1–1000 m scales using the Actively Heated Fiber Optic method
American Geophysical Union, 2014Co-Authors: Sayde C., Buelga J.b., Rodriguez-sinobas L., El Khoury L., English M., Van De Giesen, N.c., Selker J.s.Abstract:The Actively Heated Fiber Optic (AHFO) method is shown to be capable of measuring soil water content several times per hour at 0.25 m spacing along Cables of multiple kilometers in length. AHFO is based on distributed temperature sensing (DTS) observation of the heating and cooling of a buried fiber-optic Cable resulting from an electrical impulse of energy delivered from the steel Cable Jacket. The results presented were collected from 750 m of Cable buried in three 240 m colocated transects at 30, 60, and 90 cm depths in an agricultural field under center pivot irrigation. The calibration curve relating soil water content to the thermal response of the soil to a heat pulse of 10 W m?1 for 1 min duration was developed in the lab. This calibration was found appliCable to the 30 and 60 cm depth Cables, while the 90 cm depth Cable illustrated the challenges presented by soil heterogeneity for this technique. This method was used to map with high resolution the variability of soil water content and fluxes induced by the nonuniformity of water application at the surface
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Mapping variability of soil water content and flux across 1–1000 m scales using the Actively Heated Fiber Optic method
'Wiley', 2014Co-Authors: Sayde C., Buelga J.b., Rodriguez-sinobas L., El Khoury L., English M., Van De Giesen, N.c., Selker J.s.Abstract:The Actively Heated Fiber Optic (AHFO) method is shown to be capable of measuring soil water content several times per hour at 0.25 m spacing along Cables of multiple kilometers in length. AHFO is based on distributed temperature sensing (DTS) observation of the heating and cooling of a buried fiber-optic Cable resulting from an electrical impulse of energy delivered from the steel Cable Jacket. The results presented were collected from 750 m of Cable buried in three 240 m colocated transects at 30, 60, and 90 cm depths in an agricultural field under center pivot irrigation. The calibration curve relating soil water content to the thermal response of the soil to a heat pulse of 10 W m?1 for 1 min duration was developed in the lab. This calibration was found appliCable to the 30 and 60 cm depth Cables, while the 90 cm depth Cable illustrated the challenges presented by soil heterogeneity for this technique. This method was used to map with high resolution the variability of soil water content and fluxes induced by the nonuniformity of water application at the surface.Water ManagementCivil Engineering and Geoscience
Sayde C. - One of the best experts on this subject based on the ideXlab platform.
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Mapping variability of soil water content and flux across 1–1000 m scales using the Actively Heated Fiber Optic method
American Geophysical Union, 2014Co-Authors: Sayde C., Buelga J.b., Rodriguez-sinobas L., El Khoury L., English M., Van De Giesen, N.c., Selker J.s.Abstract:The Actively Heated Fiber Optic (AHFO) method is shown to be capable of measuring soil water content several times per hour at 0.25 m spacing along Cables of multiple kilometers in length. AHFO is based on distributed temperature sensing (DTS) observation of the heating and cooling of a buried fiber-optic Cable resulting from an electrical impulse of energy delivered from the steel Cable Jacket. The results presented were collected from 750 m of Cable buried in three 240 m colocated transects at 30, 60, and 90 cm depths in an agricultural field under center pivot irrigation. The calibration curve relating soil water content to the thermal response of the soil to a heat pulse of 10 W m?1 for 1 min duration was developed in the lab. This calibration was found appliCable to the 30 and 60 cm depth Cables, while the 90 cm depth Cable illustrated the challenges presented by soil heterogeneity for this technique. This method was used to map with high resolution the variability of soil water content and fluxes induced by the nonuniformity of water application at the surface
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Mapping variability of soil water content and flux across 1–1000 m scales using the Actively Heated Fiber Optic method
'Wiley', 2014Co-Authors: Sayde C., Buelga J.b., Rodriguez-sinobas L., El Khoury L., English M., Van De Giesen, N.c., Selker J.s.Abstract:The Actively Heated Fiber Optic (AHFO) method is shown to be capable of measuring soil water content several times per hour at 0.25 m spacing along Cables of multiple kilometers in length. AHFO is based on distributed temperature sensing (DTS) observation of the heating and cooling of a buried fiber-optic Cable resulting from an electrical impulse of energy delivered from the steel Cable Jacket. The results presented were collected from 750 m of Cable buried in three 240 m colocated transects at 30, 60, and 90 cm depths in an agricultural field under center pivot irrigation. The calibration curve relating soil water content to the thermal response of the soil to a heat pulse of 10 W m?1 for 1 min duration was developed in the lab. This calibration was found appliCable to the 30 and 60 cm depth Cables, while the 90 cm depth Cable illustrated the challenges presented by soil heterogeneity for this technique. This method was used to map with high resolution the variability of soil water content and fluxes induced by the nonuniformity of water application at the surface.Water ManagementCivil Engineering and Geoscience
Xiongyi Huang - One of the best experts on this subject based on the ideXlab platform.
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Research of butt welding of thin-wall Jacket for superconducting Cable and joint ☆
Fusion Engineering and Design, 2015Co-Authors: Xiongyi Huang, Kun Lu, Shahab Ud-din Khan, Huan WuAbstract:Abstract In superconducting magnetic system including with the accessorial equipment's for fusion device i.e., Tokamak, the linkage of the superconducting Cable-in-conduit conductor (CICC) requires special designed structure named as superconducting Cable joint. This joint connects the segmental superconducting Cables electrically and in the meanwhile, coolant flow is maintained non-obstructively between two Cable via the joint. For the case of “twin-box” structure joint, the boxes is sealed welded with the Cable Jacket. In realistic operational condition, the joint need to sustain complicated loads which can apply from various directions including the electromagnetic force and thermal stress. The action of the torque is the main factor that affects the welding seam quality between the joint and the Cable Jacket. In this scenario, the full penetration butt welding is the best choice. In International Thermonuclear Experimental Reactor (ITER) Feeder system, the Cable Jacket thickness is only 2 mm, and the allowable maximum temperature of the superconducting strands in Cable should be lower than 250 °C during the whole welding stage. Therefore, special welding techniques should be developed, the welding for such thin-wall Jacket limits the temperature rise of the strands and achieve the full penetration simultaneously. This paper describes the latest research and experiments in ASIPP, which aims to find a suitable method for Feeder Cable Jacket to joint box sealing weld.
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research of butt welding of thin wall Jacket for superconducting Cable and joint
Fusion Engineering and Design, 2015Co-Authors: Xinjie Wen, Xiongyi Huang, Shahab Ud-din Khan, Yao Yao, Chen LiuAbstract:Abstract In superconducting magnetic system including with the accessorial equipment's for fusion device i.e., Tokamak, the linkage of the superconducting Cable-in-conduit conductor (CICC) requires special designed structure named as superconducting Cable joint. This joint connects the segmental superconducting Cables electrically and in the meanwhile, coolant flow is maintained non-obstructively between two Cable via the joint. For the case of “twin-box” structure joint, the boxes is sealed welded with the Cable Jacket. In realistic operational condition, the joint need to sustain complicated loads which can apply from various directions including the electromagnetic force and thermal stress. The action of the torque is the main factor that affects the welding seam quality between the joint and the Cable Jacket. In this scenario, the full penetration butt welding is the best choice. In International Thermonuclear Experimental Reactor (ITER) Feeder system, the Cable Jacket thickness is only 2 mm, and the allowable maximum temperature of the superconducting strands in Cable should be lower than 250 °C during the whole welding stage. Therefore, special welding techniques should be developed, the welding for such thin-wall Jacket limits the temperature rise of the strands and achieve the full penetration simultaneously. This paper describes the latest research and experiments in ASIPP, which aims to find a suitable method for Feeder Cable Jacket to joint box sealing weld.
G.g. Karady - One of the best experts on this subject based on the ideXlab platform.
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Development of the dry-band arc on all-dielectric self-supporting Cables during laboratory tests
IEEE Transactions on Power Delivery, 2004Co-Authors: D. Srinivasan, G.g. KaradyAbstract:Utilities frequently install All-Dielectric Self-Supporting (ADSS) fiber-optic Cables on transmission lines. The Cable Jackets suffer damage due to dry-band arcing caused by high electric fields and pollution on the Cable. A test method to determine Cable resistance to dry-band arcing is being considered for standardization by the IEEE. A new nozzle arrangement for the test is proposed in this paper. Using this nozzle the repeatability of the test is significantly improved over previous arrangements. Each test cycle consists of three stages: wetting, drying, and arcing. The three stages are examined in detail. Development of the dry-band arc on the Cable Jacket during the arcing period is presented. It is shown that the length of the arc increases exponentially with time and reaches a stable length. The stable length is shown to be a function of the applied voltage.
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Investigation of the seasonal variation of ground thermal conductivity on high voltage Cable ampacity
2004 Large Engineering Systems Conference on Power Engineering (IEEE Cat. No.04EX819), 2004Co-Authors: C.l. Cooper, M.l. Dyer, G.g. KaradyAbstract:Total Cable loading depends on heat dissipation from the Cables due to their current and the surrounding thermal environment. Cable currents, Jacket temperatures, and ambient air temperatures were recorded by an underground thermocouple based data acquisition system. This allowed for the analysis of temperature effects on the Cable duct from both sources. There is interaction between the adjacent Cables. A step in current corresponds to a transient response it its Jacket temperature. Daily ambient air extremes correlated well with the daily current and Cable Jacket temperature extremes. The thermal area of influence was reduced from what was previously thought, a circle of radius 10 ft, allowing for the tighter placement of adjacent underground ducts. The assumed value for thermal resistance used in the software modeling was verified. Seasonal trends were obtained and used to find a temperature delay that will be used to create an overload duration chart for emergency loads.
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Study on the effect of test circuit parameters on dry band arcing failure of ADSS fiber optic Cable
2003 IEEE Power Engineering Society General Meeting (IEEE Cat. No.03CH37491), 2003Co-Authors: Qu Huang, G.g. Karady, Baozhuang Shi, M.w. TuominenAbstract:The purpose of this paper is to experimentally investigate the effect dry-band arcing caused failure on ADSS (all dielectric self-supporting) caused by different test circuit parameters. It is noted that the circuit parameters have significant effect on the nature of dry-band arcing. In this paper, three different test circuit conditions are applied on the same type of new Cable samples. The life data are recorded and analyzed with statistical methods. It is shown that the all-capacitance condition causes less damage to the Cable Jacket than the resistance or resistance/capacitance conditions. The waveshapes of the arc voltage and arc current are recorded and used to calculate the arc power, arc energy, and arc charge of the different cases. Analysis shows that the failure caused by dry-band arcing is an accumulative process, which is dependent on the arc power, arc duration, arc length, arc energy, arc charge, and power distribution of the arc.
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Corona caused deterioration of ADSS fiber-optic Cables on high voltage lines
IEEE Transactions on Power Delivery, 1999Co-Authors: G.g. Karady, G. Besztercey, M.w. TuominenAbstract:Summary form only as given. Deterioration of ADSS (all-dielectric self-supporting) fiber optic Cable Jacket material has been reported near the tips of armor rod assemblies installed on high-voltage transmission lines. Field observations and laboratory tests revealed that corona can exist on the tips of the armor rod. Electric field analysis reported herein reveals that the tip surface gradients are high enough to produce corona. Field conditions have been duplicated in a high voltage test chamber and Jacket damage has been observed near generated corona. The deterioration mechanism is identified and Jacket life expectancy is estimated. Different mitigation techniques are suggested.
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New test method for evaluation of corona-caused aging in fiber-optic Cables
1999 IEEE Transmission and Distribution Conference (Cat. No. 99CH36333), 1999Co-Authors: G.g. Karady, M. Torgerson, D. Torgerson, J. Wild, M. TuominenAbstract:Fiber-optic communication Cables installed on high voltage transmission line structures are subject to high electric fields, which may cause corona discharge near the grounded Cable support. This corona discharge, in the long term, deteriorates the Cable Jacket, which may result in puncture and failure. This paper proposes a new test method to evaluate the corona resistance of fiber-optic Cable Jackets. The feasibility of the method has been demonstrated by testing five different Cables for 3000 hours. The test results show that the proposed method is suitable to determine corona resistance. The authors propose that the new method be considered for an IEEE standard on fiber-optic Cable.
Buelga J.b. - One of the best experts on this subject based on the ideXlab platform.
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Mapping variability of soil water content and flux across 1–1000 m scales using the Actively Heated Fiber Optic method
American Geophysical Union, 2014Co-Authors: Sayde C., Buelga J.b., Rodriguez-sinobas L., El Khoury L., English M., Van De Giesen, N.c., Selker J.s.Abstract:The Actively Heated Fiber Optic (AHFO) method is shown to be capable of measuring soil water content several times per hour at 0.25 m spacing along Cables of multiple kilometers in length. AHFO is based on distributed temperature sensing (DTS) observation of the heating and cooling of a buried fiber-optic Cable resulting from an electrical impulse of energy delivered from the steel Cable Jacket. The results presented were collected from 750 m of Cable buried in three 240 m colocated transects at 30, 60, and 90 cm depths in an agricultural field under center pivot irrigation. The calibration curve relating soil water content to the thermal response of the soil to a heat pulse of 10 W m?1 for 1 min duration was developed in the lab. This calibration was found appliCable to the 30 and 60 cm depth Cables, while the 90 cm depth Cable illustrated the challenges presented by soil heterogeneity for this technique. This method was used to map with high resolution the variability of soil water content and fluxes induced by the nonuniformity of water application at the surface
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Mapping variability of soil water content and flux across 1–1000 m scales using the Actively Heated Fiber Optic method
'Wiley', 2014Co-Authors: Sayde C., Buelga J.b., Rodriguez-sinobas L., El Khoury L., English M., Van De Giesen, N.c., Selker J.s.Abstract:The Actively Heated Fiber Optic (AHFO) method is shown to be capable of measuring soil water content several times per hour at 0.25 m spacing along Cables of multiple kilometers in length. AHFO is based on distributed temperature sensing (DTS) observation of the heating and cooling of a buried fiber-optic Cable resulting from an electrical impulse of energy delivered from the steel Cable Jacket. The results presented were collected from 750 m of Cable buried in three 240 m colocated transects at 30, 60, and 90 cm depths in an agricultural field under center pivot irrigation. The calibration curve relating soil water content to the thermal response of the soil to a heat pulse of 10 W m?1 for 1 min duration was developed in the lab. This calibration was found appliCable to the 30 and 60 cm depth Cables, while the 90 cm depth Cable illustrated the challenges presented by soil heterogeneity for this technique. This method was used to map with high resolution the variability of soil water content and fluxes induced by the nonuniformity of water application at the surface.Water ManagementCivil Engineering and Geoscience
