The Experts below are selected from a list of 1452 Experts worldwide ranked by ideXlab platform
Qi Wang - One of the best experts on this subject based on the ideXlab platform.
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Achieving Predictive and Proactive Maintenance for High-Speed Railway Power Equipment With LSTM-RNN
IEEE Transactions on Industrial Informatics, 2020Co-Authors: Qi WangAbstract:Current Maintenance Mode for high-speed railway (HSR) power equipment is so outdated that can hardly adapt to the high-standard Modern HSR. Therefore, a new possibility is proposed in this article to update the obsoleting Maintenance Mode of the HSR power equipment by adopting both predictive Maintenance and proactive Maintenance. With the combination of data-driven (predictive) and Model-based (proactive) approaches, two principal constituents—the sample generator and the Maintenance predictor—are designed. The Maintenance predictor which is powered by the long short-term memory recurrent neural network is developed to realize the goal of predictive Maintenance. The sample generator which is formulated by the physical degradation and failure Model of HSR power equipment is proposed toward the goal of proactive Maintenance. Test results on a gas-insulated switchgear have shown the powerful collaboration between the generator and the predictor, to not only accurately predict future Maintenance timing of the switchgear based on historical sample data, but also enrich the data supply proactively to deal with potential data deficiency problems.
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a Maintenance Mode decision method for traction power supply system of high speed railway
IEEE Conference on Prognostics and Health Management, 2015Co-Authors: Qi Wang, Ding FengAbstract:The Traction Power Supply System (TPSS) as the only power source of High-Speed Railway (HSR), its Maintenance management needs to be supported by a complete set of solutions. Maintenance Mode decision is the primary and first part of the solutions. The most appropriate Maintenance Mode leads to the best Maintenance effect, the least cost and the highest reliability. Because of the huge number of influence factors of Maintenance Mode decision and intricate relationship among those factors, the decision process is complicated. Therefore several alternative Maintenance Modes are summarized with their pros and cons. Factors Set of Maintenance Mode Decision (FSMMD) is established while the interdependence and the feedback relationships among factors are clarified and quantified. The Analytic Network Process (ANP) is applied and the ANP Maintenance decision Model is built to decide the most appropriate Maintenance Modes. The case study shows that the appropriate Maintenance Modes can be decided while the inappropriate Maintenance Modes of HSR TPSS can be avoid by this method.
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ICPHM - A Maintenance Mode decision method for traction power supply system of high-speed railway
2015 IEEE Conference on Prognostics and Health Management (PHM), 2015Co-Authors: Qi Wang, Ding FengAbstract:The Traction Power Supply System (TPSS) as the only power source of High-Speed Railway (HSR), its Maintenance management needs to be supported by a complete set of solutions. Maintenance Mode decision is the primary and first part of the solutions. The most appropriate Maintenance Mode leads to the best Maintenance effect, the least cost and the highest reliability. Because of the huge number of influence factors of Maintenance Mode decision and intricate relationship among those factors, the decision process is complicated. Therefore several alternative Maintenance Modes are summarized with their pros and cons. Factors Set of Maintenance Mode Decision (FSMMD) is established while the interdependence and the feedback relationships among factors are clarified and quantified. The Analytic Network Process (ANP) is applied and the ANP Maintenance decision Model is built to decide the most appropriate Maintenance Modes. The case study shows that the appropriate Maintenance Modes can be decided while the inappropriate Maintenance Modes of HSR TPSS can be avoid by this method.
Glenn Van De Ven - One of the best experts on this subject based on the ideXlab platform.
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An Absence of Radio-Loud Active Galactic Nuclei in Geometrically Flat Quiescent Galaxies: Implications for Maintenance-Mode Feedback Models
The Astrophysical Journal, 2019Co-Authors: Ivana Barišić, Arjen Van Der Wel, Josha Van Houdt, Michael V. Maseda, Eric F. Bell, Rachel Bezanson, Yu-yen Chang, Huub Röttgering, Glenn Van De VenAbstract:Maintenance-Mode feedback from low-accretion rate AGN, manifesting itself observationally through radio-loudness, is invoked in all cosmological galaxy formation Models as a mechanism that prevents excessive star-formation in massive galaxies (M$_*$ $\gtrsim$ 3$\times$10$^{10}$ M$_{\odot}$). We demonstrate that at a fixed mass the incidence of radio-loud AGN (L $>$ 10$^{23}$ WHz$^{- 1}$) identified in the FIRST and NVSS radio surveys among a large sample of quiescent (non-star forming) galaxies selected from the SDSS is much higher in geometrically round galaxies than in geometrically flat, disk-like galaxies. As found previously, the RL AGN fraction increases steeply with stellar velocity dispersion $\sigma_*$ and stellar mass, but even at a fixed velocity dispersion of 200-250 kms$^{-1}$ this fraction increases from 0.3% for flat galaxies (projected axis ratio of q $ $ 0.8). We rule out that this strong trend is due to projection effects in the measured velocity dispersion. The large fraction of radio-loud AGN in massive, round galaxies is consistent with the hypothesis that such AGN deposit energy into their hot gaseous halos, preventing cooling and star-formation. However, the absence of such AGN in disk-like quiescent galaxies -- most of which are not satellites in massive clusters, raises important questions: is Maintenance-Mode feedback a generally valid explanation for quiescence; and, if so, how does that feedback avoid manifesting at least occasionally as a radio-loud galaxy?
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An absence of radio-loud active galactic nuclei in geometrically flat quiescent galaxies : implications for Maintenance-Mode feedback Models
2019Co-Authors: Ivana Barišić, Arjen Van Der Wel, Josha Van Houdt, Michael V. Maseda, Eric F. Bell, Rachel Bezanson, Yu-yen Chang, Huub Röttgering, Glenn Van De VenAbstract:Maintenance-Mode feedback from low-accretion-rate active galactic nuclei (AGNs), manifesting itself observationally through radio-loudness, is invoked in all cosmological galaxy formation Models as a mechanism that prevents excessive star formation in massive galaxies (M-* greater than or similar to 3 x 10(10) M-circle dot). We demonstrate that at a fixed mass the incidence of radio-loud (RL) AGNs (L > 10(23) W Hz(-1)) identified in the Faint Images of the Radio Sky at Twenty centimeter and NRAO Very Large Array Sky Survey radio surveys among a large sample of quiescent (non-star-forming) galaxies selected from the Sloan Digital Sky Survey is much higher in geometrically round galaxies than in geometrically flat, disk-like galaxies. As found previously, the RL AGN fraction increases steeply with stellar velocity dispersion sigma(*) and stellar mass, but even at a fixed velocity dispersion of 200-250 km s(-1) this fraction increases from 0.3% for flat galaxies (projected axis ratio of q 0.8). We rule out the hypothesis that this strong trend is due to projection effects in the measured velocity dispersion. The large fraction of RL AGNs in massive, round galaxies is consistent with the hypothesis that such AGNs deposit energy into their hot gaseous halos, preventing cooling and star formation. However, the absence of such AGNs in disk-like quiescent galaxies-most of which are not satellites in massive clusters, raises important questions. Is Maintenance-Mode feedback a generally valid explanation for quiescence? If so, how does that feedback avoid manifesting at least occasionally as an RL galaxy?
Ivana Barišić - One of the best experts on this subject based on the ideXlab platform.
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An Absence of Radio-Loud Active Galactic Nuclei in Geometrically Flat Quiescent Galaxies: Implications for Maintenance-Mode Feedback Models
The Astrophysical Journal, 2019Co-Authors: Ivana Barišić, Arjen Van Der Wel, Josha Van Houdt, Michael V. Maseda, Eric F. Bell, Rachel Bezanson, Yu-yen Chang, Huub Röttgering, Glenn Van De VenAbstract:Maintenance-Mode feedback from low-accretion rate AGN, manifesting itself observationally through radio-loudness, is invoked in all cosmological galaxy formation Models as a mechanism that prevents excessive star-formation in massive galaxies (M$_*$ $\gtrsim$ 3$\times$10$^{10}$ M$_{\odot}$). We demonstrate that at a fixed mass the incidence of radio-loud AGN (L $>$ 10$^{23}$ WHz$^{- 1}$) identified in the FIRST and NVSS radio surveys among a large sample of quiescent (non-star forming) galaxies selected from the SDSS is much higher in geometrically round galaxies than in geometrically flat, disk-like galaxies. As found previously, the RL AGN fraction increases steeply with stellar velocity dispersion $\sigma_*$ and stellar mass, but even at a fixed velocity dispersion of 200-250 kms$^{-1}$ this fraction increases from 0.3% for flat galaxies (projected axis ratio of q $ $ 0.8). We rule out that this strong trend is due to projection effects in the measured velocity dispersion. The large fraction of radio-loud AGN in massive, round galaxies is consistent with the hypothesis that such AGN deposit energy into their hot gaseous halos, preventing cooling and star-formation. However, the absence of such AGN in disk-like quiescent galaxies -- most of which are not satellites in massive clusters, raises important questions: is Maintenance-Mode feedback a generally valid explanation for quiescence; and, if so, how does that feedback avoid manifesting at least occasionally as a radio-loud galaxy?
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An absence of radio-loud active galactic nuclei in geometrically flat quiescent galaxies : implications for Maintenance-Mode feedback Models
2019Co-Authors: Ivana Barišić, Arjen Van Der Wel, Josha Van Houdt, Michael V. Maseda, Eric F. Bell, Rachel Bezanson, Yu-yen Chang, Huub Röttgering, Glenn Van De VenAbstract:Maintenance-Mode feedback from low-accretion-rate active galactic nuclei (AGNs), manifesting itself observationally through radio-loudness, is invoked in all cosmological galaxy formation Models as a mechanism that prevents excessive star formation in massive galaxies (M-* greater than or similar to 3 x 10(10) M-circle dot). We demonstrate that at a fixed mass the incidence of radio-loud (RL) AGNs (L > 10(23) W Hz(-1)) identified in the Faint Images of the Radio Sky at Twenty centimeter and NRAO Very Large Array Sky Survey radio surveys among a large sample of quiescent (non-star-forming) galaxies selected from the Sloan Digital Sky Survey is much higher in geometrically round galaxies than in geometrically flat, disk-like galaxies. As found previously, the RL AGN fraction increases steeply with stellar velocity dispersion sigma(*) and stellar mass, but even at a fixed velocity dispersion of 200-250 km s(-1) this fraction increases from 0.3% for flat galaxies (projected axis ratio of q 0.8). We rule out the hypothesis that this strong trend is due to projection effects in the measured velocity dispersion. The large fraction of RL AGNs in massive, round galaxies is consistent with the hypothesis that such AGNs deposit energy into their hot gaseous halos, preventing cooling and star formation. However, the absence of such AGNs in disk-like quiescent galaxies-most of which are not satellites in massive clusters, raises important questions. Is Maintenance-Mode feedback a generally valid explanation for quiescence? If so, how does that feedback avoid manifesting at least occasionally as an RL galaxy?
Josha Van Houdt - One of the best experts on this subject based on the ideXlab platform.
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An Absence of Radio-Loud Active Galactic Nuclei in Geometrically Flat Quiescent Galaxies: Implications for Maintenance-Mode Feedback Models
The Astrophysical Journal, 2019Co-Authors: Ivana Barišić, Arjen Van Der Wel, Josha Van Houdt, Michael V. Maseda, Eric F. Bell, Rachel Bezanson, Yu-yen Chang, Huub Röttgering, Glenn Van De VenAbstract:Maintenance-Mode feedback from low-accretion rate AGN, manifesting itself observationally through radio-loudness, is invoked in all cosmological galaxy formation Models as a mechanism that prevents excessive star-formation in massive galaxies (M$_*$ $\gtrsim$ 3$\times$10$^{10}$ M$_{\odot}$). We demonstrate that at a fixed mass the incidence of radio-loud AGN (L $>$ 10$^{23}$ WHz$^{- 1}$) identified in the FIRST and NVSS radio surveys among a large sample of quiescent (non-star forming) galaxies selected from the SDSS is much higher in geometrically round galaxies than in geometrically flat, disk-like galaxies. As found previously, the RL AGN fraction increases steeply with stellar velocity dispersion $\sigma_*$ and stellar mass, but even at a fixed velocity dispersion of 200-250 kms$^{-1}$ this fraction increases from 0.3% for flat galaxies (projected axis ratio of q $ $ 0.8). We rule out that this strong trend is due to projection effects in the measured velocity dispersion. The large fraction of radio-loud AGN in massive, round galaxies is consistent with the hypothesis that such AGN deposit energy into their hot gaseous halos, preventing cooling and star-formation. However, the absence of such AGN in disk-like quiescent galaxies -- most of which are not satellites in massive clusters, raises important questions: is Maintenance-Mode feedback a generally valid explanation for quiescence; and, if so, how does that feedback avoid manifesting at least occasionally as a radio-loud galaxy?
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An absence of radio-loud active galactic nuclei in geometrically flat quiescent galaxies : implications for Maintenance-Mode feedback Models
2019Co-Authors: Ivana Barišić, Arjen Van Der Wel, Josha Van Houdt, Michael V. Maseda, Eric F. Bell, Rachel Bezanson, Yu-yen Chang, Huub Röttgering, Glenn Van De VenAbstract:Maintenance-Mode feedback from low-accretion-rate active galactic nuclei (AGNs), manifesting itself observationally through radio-loudness, is invoked in all cosmological galaxy formation Models as a mechanism that prevents excessive star formation in massive galaxies (M-* greater than or similar to 3 x 10(10) M-circle dot). We demonstrate that at a fixed mass the incidence of radio-loud (RL) AGNs (L > 10(23) W Hz(-1)) identified in the Faint Images of the Radio Sky at Twenty centimeter and NRAO Very Large Array Sky Survey radio surveys among a large sample of quiescent (non-star-forming) galaxies selected from the Sloan Digital Sky Survey is much higher in geometrically round galaxies than in geometrically flat, disk-like galaxies. As found previously, the RL AGN fraction increases steeply with stellar velocity dispersion sigma(*) and stellar mass, but even at a fixed velocity dispersion of 200-250 km s(-1) this fraction increases from 0.3% for flat galaxies (projected axis ratio of q 0.8). We rule out the hypothesis that this strong trend is due to projection effects in the measured velocity dispersion. The large fraction of RL AGNs in massive, round galaxies is consistent with the hypothesis that such AGNs deposit energy into their hot gaseous halos, preventing cooling and star formation. However, the absence of such AGNs in disk-like quiescent galaxies-most of which are not satellites in massive clusters, raises important questions. Is Maintenance-Mode feedback a generally valid explanation for quiescence? If so, how does that feedback avoid manifesting at least occasionally as an RL galaxy?
Rachel Bezanson - One of the best experts on this subject based on the ideXlab platform.
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An Absence of Radio-Loud Active Galactic Nuclei in Geometrically Flat Quiescent Galaxies: Implications for Maintenance-Mode Feedback Models
The Astrophysical Journal, 2019Co-Authors: Ivana Barišić, Arjen Van Der Wel, Josha Van Houdt, Michael V. Maseda, Eric F. Bell, Rachel Bezanson, Yu-yen Chang, Huub Röttgering, Glenn Van De VenAbstract:Maintenance-Mode feedback from low-accretion rate AGN, manifesting itself observationally through radio-loudness, is invoked in all cosmological galaxy formation Models as a mechanism that prevents excessive star-formation in massive galaxies (M$_*$ $\gtrsim$ 3$\times$10$^{10}$ M$_{\odot}$). We demonstrate that at a fixed mass the incidence of radio-loud AGN (L $>$ 10$^{23}$ WHz$^{- 1}$) identified in the FIRST and NVSS radio surveys among a large sample of quiescent (non-star forming) galaxies selected from the SDSS is much higher in geometrically round galaxies than in geometrically flat, disk-like galaxies. As found previously, the RL AGN fraction increases steeply with stellar velocity dispersion $\sigma_*$ and stellar mass, but even at a fixed velocity dispersion of 200-250 kms$^{-1}$ this fraction increases from 0.3% for flat galaxies (projected axis ratio of q $ $ 0.8). We rule out that this strong trend is due to projection effects in the measured velocity dispersion. The large fraction of radio-loud AGN in massive, round galaxies is consistent with the hypothesis that such AGN deposit energy into their hot gaseous halos, preventing cooling and star-formation. However, the absence of such AGN in disk-like quiescent galaxies -- most of which are not satellites in massive clusters, raises important questions: is Maintenance-Mode feedback a generally valid explanation for quiescence; and, if so, how does that feedback avoid manifesting at least occasionally as a radio-loud galaxy?
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An absence of radio-loud active galactic nuclei in geometrically flat quiescent galaxies : implications for Maintenance-Mode feedback Models
2019Co-Authors: Ivana Barišić, Arjen Van Der Wel, Josha Van Houdt, Michael V. Maseda, Eric F. Bell, Rachel Bezanson, Yu-yen Chang, Huub Röttgering, Glenn Van De VenAbstract:Maintenance-Mode feedback from low-accretion-rate active galactic nuclei (AGNs), manifesting itself observationally through radio-loudness, is invoked in all cosmological galaxy formation Models as a mechanism that prevents excessive star formation in massive galaxies (M-* greater than or similar to 3 x 10(10) M-circle dot). We demonstrate that at a fixed mass the incidence of radio-loud (RL) AGNs (L > 10(23) W Hz(-1)) identified in the Faint Images of the Radio Sky at Twenty centimeter and NRAO Very Large Array Sky Survey radio surveys among a large sample of quiescent (non-star-forming) galaxies selected from the Sloan Digital Sky Survey is much higher in geometrically round galaxies than in geometrically flat, disk-like galaxies. As found previously, the RL AGN fraction increases steeply with stellar velocity dispersion sigma(*) and stellar mass, but even at a fixed velocity dispersion of 200-250 km s(-1) this fraction increases from 0.3% for flat galaxies (projected axis ratio of q 0.8). We rule out the hypothesis that this strong trend is due to projection effects in the measured velocity dispersion. The large fraction of RL AGNs in massive, round galaxies is consistent with the hypothesis that such AGNs deposit energy into their hot gaseous halos, preventing cooling and star formation. However, the absence of such AGNs in disk-like quiescent galaxies-most of which are not satellites in massive clusters, raises important questions. Is Maintenance-Mode feedback a generally valid explanation for quiescence? If so, how does that feedback avoid manifesting at least occasionally as an RL galaxy?
