The Experts below are selected from a list of 277254 Experts worldwide ranked by ideXlab platform
D L Atherton - One of the best experts on this subject based on the ideXlab platform.
-
characterization of the magnetic easy axis in pipeline steel using magnetic barkhausen noise
Journal of Applied Physics, 1994Co-Authors: T W Krause, L Clapham, D L AthertonAbstract:The angular dependence of magnetic Barkhausen noise (MBN) on eight surfaces through the thickness of a 2% Mn steel pipeline sample was investigated. The MBN Signal was analyzed by integrating the square of the MBN voltage Signal with respect to the time axis. The resulting value, referred to as the MBN Energy Signal, was modeled by considering the irreversible motion of 180° domain walls, under the influence of an oriented magnetic field. An expression for the angular dependence of the MBN Energy Signal was derived and was given by Energy=α cos2 θ+β, where α and β are the fitting parameters and θ is the angle between the maximum MBN Signal and the applied sweep field. The α parameter was associated with the irreversible motion of 180° walls that contributed to the net macroscopic easy axis near the surface of the sample, while the β parameter was associated with the isotropic background MBN Signal. The Energy equation could be used to fit the data for all sweep field amplitudes in which the MBN spectrum w...
-
characterization of the magnetic easy axis in pipeline steel using magnetic barkhausen noise
Journal of Applied Physics, 1994Co-Authors: T W Krause, L Clapham, D L AthertonAbstract:The angular dependence of magnetic Barkhausen noise (MBN) on eight surfaces through the thickness of a 2% Mn steel pipeline sample was investigated. The MBN Signal was analyzed by integrating the square of the MBN voltage Signal with respect to the time axis. The resulting value, referred to as the MBN Energy Signal, was modeled by considering the irreversible motion of 180° domain walls, under the influence of an oriented magnetic field. An expression for the angular dependence of the MBN Energy Signal was derived and was given by Energy=α cos2 θ+β, where α and β are the fitting parameters and θ is the angle between the maximum MBN Signal and the applied sweep field. The α parameter was associated with the irreversible motion of 180° walls that contributed to the net macroscopic easy axis near the surface of the sample, while the β parameter was associated with the isotropic background MBN Signal. The Energy equation could be used to fit the data for all sweep field amplitudes in which the MBN spectrum was observed. A dependence of the α and β parameters on the applied sweep field amplitude was observed.
T P Biesiadzinski - One of the best experts on this subject based on the ideXlab platform.
-
calibration event reconstruction data analysis and limit calculation for the lux dark matter experiment
Physical Review D, 2018Co-Authors: D S Akerib, S Alsum, H M Araujo, X Bai, A J Bailey, J Balajthy, P Beltrame, E P Bernard, A Bernstein, T P BiesiadzinskiAbstract:The LUX experiment has performed searches for dark-matter particles scattering elastically on xenon nuclei, leading to stringent upper limits on the nuclear scattering cross sections for dark matter. Here, for results derived from 1.4×104 kg days of target exposure in 2013, details of the calibration, event-reconstruction, modeling, and statistical tests that underlie the results are presented. Detector performance is characterized, including measured efficiencies, stability of response, position resolution, and discrimination between electron- and nuclear-recoil populations. Models are developed for the drift field, optical properties, background populations, the electron- and nuclear-recoil responses, and the absolute rate of low-Energy background events. Innovations in the analysis include in situ measurement of the photomultipliers' response to xenon scintillation photons, verification of fiducial mass with a low-Energy internal calibration source, and new empirical models for low-Energy Signal yield based on large-sample, in situ calibrations.
-
calibration event reconstruction data analysis and limit calculation for the lux dark matter experiment
Physical Review D, 2018Co-Authors: D S Akerib, S Alsum, H M Araujo, X Bai, A J Bailey, J Balajthy, P Beltrame, E P Bernard, A Bernstein, T P BiesiadzinskiAbstract:Author(s): Akerib, DS; Alsum, S; Araujo, HM; Bai, X; Bailey, AJ; Balajthy, J; Beltrame, P; Bernard, EP; Bernstein, A; Biesiadzinski, TP; Boulton, EM; Bras, P; Byram, D; Cahn, SB; Carmona-Benitez, MC; Chan, C; Currie, A; Cutter, JE; Davison, TJR; Dobi, A; Dobson, JEY; Druszkiewicz, E; Edwards, BN; Faham, CH; Fallon, SR; Fan, A; Fiorucci, S; Gaitskell, RJ; Gehman, VM; Genovesi, J; Ghag, C; Gilchriese, MGD; Hall, CR; Hanhardt, M; Haselschwardt, SJ; Hertel, SA; Hogan, DP; Horn, M; Huang, DQ; Ignarra, CM; Jacobsen, RG; Ji, W; Kamdin, K; Kazkaz, K; Khaitan, D; Knoche, R; Larsen, NA; Lee, C; Lenardo, BG; Lesko, KT; Lindote, A; Lopes, MI; Manalaysay, A; Mannino, RL; Marzioni, MF; McKinsey, DN; Mei, DM; Mock, J; Moongweluwan, M; Morad, JA; Murphy, ASJ; Nehrkorn, C; Nelson, HN; Neves, F; O'Sullivan, K; Oliver-Mallory, KC; Palladino, KJ; Pease, EK; Reichhart, L; Rhyne, C; Shaw, S; Shutt, TA; Silva, C; Solmaz, M; Solovov, VN; Sorensen, P; Sumner, TJ; Szydagis, M; Taylor, DJ; Taylor, WC; Tennyson, BP; Terman, PA; Tiedt, DR; To, WH; Tripathi, M | Abstract: © 2018 American Physical Society. The LUX experiment has performed searches for dark-matter particles scattering elastically on xenon nuclei, leading to stringent upper limits on the nuclear scattering cross sections for dark matter. Here, for results derived from 1.4×104 kg days of target exposure in 2013, details of the calibration, event-reconstruction, modeling, and statistical tests that underlie the results are presented. Detector performance is characterized, including measured efficiencies, stability of response, position resolution, and discrimination between electron- and nuclear-recoil populations. Models are developed for the drift field, optical properties, background populations, the electron- and nuclear-recoil responses, and the absolute rate of low-Energy background events. Innovations in the analysis include in situ measurement of the photomultipliers' response to xenon scintillation photons, verification of fiducial mass with a low-Energy internal calibration source, and new empirical models for low-Energy Signal yield based on large-sample, in situ calibrations.
T W Krause - One of the best experts on this subject based on the ideXlab platform.
-
characterization of the magnetic easy axis in pipeline steel using magnetic barkhausen noise
Journal of Applied Physics, 1994Co-Authors: T W Krause, L Clapham, D L AthertonAbstract:The angular dependence of magnetic Barkhausen noise (MBN) on eight surfaces through the thickness of a 2% Mn steel pipeline sample was investigated. The MBN Signal was analyzed by integrating the square of the MBN voltage Signal with respect to the time axis. The resulting value, referred to as the MBN Energy Signal, was modeled by considering the irreversible motion of 180° domain walls, under the influence of an oriented magnetic field. An expression for the angular dependence of the MBN Energy Signal was derived and was given by Energy=α cos2 θ+β, where α and β are the fitting parameters and θ is the angle between the maximum MBN Signal and the applied sweep field. The α parameter was associated with the irreversible motion of 180° walls that contributed to the net macroscopic easy axis near the surface of the sample, while the β parameter was associated with the isotropic background MBN Signal. The Energy equation could be used to fit the data for all sweep field amplitudes in which the MBN spectrum w...
-
characterization of the magnetic easy axis in pipeline steel using magnetic barkhausen noise
Journal of Applied Physics, 1994Co-Authors: T W Krause, L Clapham, D L AthertonAbstract:The angular dependence of magnetic Barkhausen noise (MBN) on eight surfaces through the thickness of a 2% Mn steel pipeline sample was investigated. The MBN Signal was analyzed by integrating the square of the MBN voltage Signal with respect to the time axis. The resulting value, referred to as the MBN Energy Signal, was modeled by considering the irreversible motion of 180° domain walls, under the influence of an oriented magnetic field. An expression for the angular dependence of the MBN Energy Signal was derived and was given by Energy=α cos2 θ+β, where α and β are the fitting parameters and θ is the angle between the maximum MBN Signal and the applied sweep field. The α parameter was associated with the irreversible motion of 180° walls that contributed to the net macroscopic easy axis near the surface of the sample, while the β parameter was associated with the isotropic background MBN Signal. The Energy equation could be used to fit the data for all sweep field amplitudes in which the MBN spectrum was observed. A dependence of the α and β parameters on the applied sweep field amplitude was observed.
Rui Zhang - One of the best experts on this subject based on the ideXlab platform.
-
collaborative wireless Energy and information transfer in interference channel
IEEE Transactions on Wireless Communications, 2015Co-Authors: Seunghyun Lee, Liang Liu, Rui ZhangAbstract:This paper studies the simultaneous wireless information and power transfer (SWIPT) in a multiuser wireless system, in which distributed transmitters send independent messages to their respective receivers, and at the same time cooperatively transmit wireless power to the receivers via Energy beamforming. Accordingly, from the wireless information transmission (WIT) perspective, the system of interest can be modeled as the classic interference channel, while it also can be regarded as a distributed multiple-input multiple-output (MIMO) system for collaborative wireless Energy transmission (WET). To enable both information decoding (ID) and Energy harvesting (EH) in SWIPT, we adopt the low-complexity time switching operation at each receiver to switch between the ID and EH modes over scheduled time. For the hybrid system, we aim to characterize the achievable rate-Energy (R–E) trade-offs by various transmitter-side collaboration schemes. Specifically, to facilitate the collaborative Energy beamforming, we propose a new Signal splitting scheme at the transmitters, where each transmit Signal is generally split into an information Signal and an Energy Signal for WIT and WET, respectively. With this new scheme, first, we study the two-user SWIPT system over the fading channel and derive the optimal mode switching rule at the receivers as well as the corresponding transmit Signal optimization to achieve various R-E trade-offs. We also compare the R-E performance of our proposed scheme with transmit Energy beamforming and Signal splitting against two existing schemes with partial or no cooperation of the transmitters. Next, the general case of SWIPT systems with more than two users is studied, for which we propose a practical transmit collaboration scheme by extending the result for the two-user case: we group users into different pairs and apply the cooperation schemes obtained in the two-user case to each paired group. Furthermore, we present a benchmarking scheme based on joint cooperation of all the transmitters inspired by the principle of interference alignment , against which the performance of the proposed scheme is compared.
-
collaborative wireless Energy and information transfer in interference channel
arXiv: Information Theory, 2014Co-Authors: Seunghyun Lee, Liang Liu, Rui ZhangAbstract:This paper studies the simultaneous wireless information and power transfer (SWIPT) in a multiuser wireless system, in which distributed transmitters send independent messages to their respective receivers, and at the same time cooperatively transmit wireless power to the receivers via Energy beamforming. Accordingly, from the wireless information transmission (WIT) perspective, the system of interest can be modeled as the classic interference channel, while it also can be regarded as a distributed multiple-input multiple-output (MIMO) system for collaborative wireless Energy transmission (WET). To enable both information decoding (ID) and Energy harvesting (EH) in SWIPT, we adopt the low-complexity time switching operation at each receiver to switch between the ID and EH modes over scheduled time. Based on this hybrid model, we aim to characterize the achievable rate-Energy (R-E) trade-offs in the multiuser SWIPT system under various transmitter-side collaboration schemes. Specifically, to facilitate the collaborative Energy beamforming, we propose a new Signal splitting scheme at the transmitters, where each transmit Signal is generally composed of an information Signal component and an Energy Signal component for WIT and WET, respectively. With this new scheme, first, we study the two-user SWIPT system and derive the optimal mode switching rule at the receivers and the corresponding transmit Signal optimization to achieve various R-E trade-offs over the fading channel. We also compare the R-E performance of our proposed scheme with transmit Energy beamforming and Signal splitting against two existing schemes with partial or no cooperation of the transmitters, and show remarkable gains over these baseline schemes. Finally, the general case of SWIPT systems with more than two users is studied, for which we propose and compare two practical transmit collaboration schemes.
Huaichun Zhou - One of the best experts on this subject based on the ideXlab platform.
-
principles of optimization of combustion by radiant Energy Signal and its application in a 660 mwe down and coal fired boiler
Korean Journal of Chemical Engineering, 2011Co-Authors: Zixue Luo, Huaichun Zhou, Fei Wang, Rutie Liu, Gengzhou ChangAbstract:For the optimization of combustion in utility coal-fired boilers, a simple analytic model was set up to relate the radiant Energy Signal (RES) with the combustion rate (heat release rate) based on the heat transfer equation inside a boiler furnace. It was pointed out that as the air flow rate into the furnace changes, the highest RES corresponds to the highest efficiency, making RES a sensitive quantity for optimization of combustion in boilers. Experiments carried out in a 660 MW down- and coal-fired utility boiler confirmed the characteristics of RES as an indicator of combustion rate inside the furnace and its ability to reflect the boiler thermal efficiency varied with the air flow rate. The utilization of RES in the optimization of combustion can generally improve the boiler thermal efficiency at different unit loads, and the efficiency was raised about 1.0% especially at the rated and lower unit loads. It should be stated that except the lower unit load, the NOx emission from the boiler after optimization of combustion by RES would increase due to the limitation in supply of adequate air flow rate into the boiler, and some new combustion technologies are now available to solve the contradiction.
-
optimization of combustion based on introducing radiant Energy Signal in pulverized coal fired boiler
Fuel Processing Technology, 2010Co-Authors: Benyuan Huang, Zixue Luo, Huaichun ZhouAbstract:Abstract This work presents a new conception of in-situ combustion control schemes for pulverized coal-fired boilers to improve the installed conventional control equipment of power plant units. In this paper, radiant Energy Signal (RES), based on a flame image processing technique, is put forward and an optimal on-line combustion supervisory strategy is developed for introducing RES into the combustion control circuit. The results show that better combustion efficiency can be obtained in association with the control property. Also a decrease in fuel consumption with a corresponding decrease in the consumption of Energy, as well as a reduction of emissions, has been studied and tested for the optimization. In this paper, the optimal scheme is proved to be practical and economical, and it can be used to optimize the combustion control design and operation of pulverized coal-burning boilers, when considering both the stability of steam pressure as a traditional calorific value Signal and the rapidity of response by using RES .
-
a combustion monitoring system with 3 d temperature reconstruction based on flame image processing technique
IEEE Transactions on Instrumentation and Measurement, 2007Co-Authors: Zixue Luo, Huaichun ZhouAbstract:Based on a flame-image processing technology, a real-time combustion-monitoring system with 3-D temperature reconstruction and visualization installed in a coal-fired furnace of a power plant was reported. A dozen of flame detectors with charge-coupled-device cameras were mounted along the height of the furnace to capture multiple digital flame images. A radiation Energy Signal (RES) was obtained from the flame images according to Wien's law of radiation. A series of in situ experiments have been done, and the results showed that the flame temperature distribution and the RES are sensitive to change in the combustion of the boiler and can be used to improve the combustion control in practical application.