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Well-being analysis of GSU transformer insulation incorporating the impact on power generation using fuzzy logic

Alagarsamy KRISHNAVEL, Dusmata Kumar MOHANTA, M. Jaya Bharata REDDY

Frontiers in Energy 2013, Volume 7, Issue 3,   Pages 288-299 doi: 10.1007/s11708-013-0265-7

Abstract: With the prevailing power scenario, every watt-second of electrical energy has its own merit in satisfying the consumer demand. At the state of such a stringent energy demanding era, failure of a power generation equipment compounds the energy constraints which will not only result in a huge loss of generation but also have an impact on capital revenue. The unexpected failure of generator step-up (GSU) transformer is especially a major disturbance in the power system operation and leads to unscheduled outages with power delivery problems. The time lag in bringing back the equipment in service after rectification or replacement may increase the criticality as the process involves mobilization of spares and maintenance professionals. Hot atmosphere existing in the vicinity of thermal power stations running round-the-clock with more than 100% plant load factor (PLF) increases the thermal stress of the electrical insulation which leads to premature failure of windings, bushings, core laminations, etc. The healthy state of the GSU transformer has to be ensured to minimize the loss of power generation. As the predication related to failure of a GSU transformer is associated with some uncertainties, a fuzzy approach is employed in this paper along with actual field data and case studies for the well-being analysis of GSU transformer.

Keywords： generator step-up (GSU) transformer     well-being analysis     dissolved gases in oil analysis (DGA)     tan delta(TD)     sweep frequency response analysis (SFRA)     fuzzy inference system (FIS)    

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An improved delta-star switching scheme for reactive power saving in three-phase induction motors

P. RAJA,N. KUMARESAN,M. SUBBIAH

Frontiers in Energy 2014, Volume 8, Issue 3,   Pages 364-370 doi: 10.1007/s11708-014-0324-8

Abstract: permanently across each phase winding of a three-phase induction motor along with the conventional delta-starthe capacitor and the criteria to be adopted for calculating the power output at which the star to deltaCompared to using only a single delta connected stator winding or a delta-star switching, the advantages

Keywords： delta-star switching     induction motor     power factor     steady-state analysis    

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Energy internet in the Yangtze River Delta: opportunities, challenges, and suggestions

Zheng YAN, Jiayi HU

Frontiers in Energy 2018, Volume 12, Issue 4,   Pages 484-492 doi: 10.1007/s11708-018-0600-0

Abstract: review, the opportunities and the challenges posed to developing energy internet in the Yangtze River DeltaThen the framework of energy internet in the Yangtze River Delta is constructed, according to which specific

Keywords： energy internet     opportunities     challenges     suggestions     the Yangtze River Delta    

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Long-term trends of fine particulate matter and chemical composition in the Pearl River Delta Economic

Xuemei WANG,Weihua CHEN,Duohong CHEN,Zhiyong WU,Qi Fan

Frontiers of Environmental Science & Engineering 2016, Volume 10, Issue 1,   Pages 53-62 doi: 10.1007/s11783-014-0728-z

Abstract: paper analyzes PM data from various published sources for the years 2000 to 2010 in the Pearl River Delta

Keywords： long-term trends     fine particulate matter     chemical components     Pearl River Delta Economic Zone (PRDEZ)    

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attribution for mercury deposition with an updated atmospheric mercury emission inventory in the Pearl River Delta

Jiajun Liu, Long Wang, Yun Zhu, Che-Jen Lin, Carey Jang, Shuxiao Wang, Jia Xing, Bin Yu, Hui Xu, Yuzhou Pan

Frontiers of Environmental Science & Engineering 2019, Volume 13, Issue 1, doi: 10.1007/s11783-019-1087-6

Abstract: p>

Estimated anthropogenic Hg emission was 11.9 tons in Pearl River Delta

Keywords： Emission inventory     Mercury deposition     Pearl River Delta (PRD)     Source attribution     Control strategy    

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Photochemical indicators of ozone sensitivity: application in the Pearl River Delta, China

Lyumeng Ye,Xuemei Wang,Shaofeng Fan,Weihua Chen,Ming Chang,Shengzhen Zhou,Zhiyong Wu,Qi Fan

Frontiers of Environmental Science & Engineering 2016, Volume 10, Issue 6, doi: 10.1007/s11783-016-0887-1

Abstract: WRF-Chem was used to study a serious ozone episode in fall over the Pearl River Delta (PRD).

Keywords： Ozone     Pearl River Delta (PRD)     Sensitivity regime     Photochemical indicator     Threshold levels    

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Space view of the decadal variation for typical air pollutants in the Pearl River Delta (PRD) region

Zifeng WANG, Min SHAO, Liangfu CHEN, Minghui TAO, Liuju ZHONG, Duohong CHEN, Meng FAN, Yang WANG, Xinhui WANG

Frontiers of Environmental Science & Engineering 2016, Volume 10, Issue 5, doi: 10.1007/s11783-016-0853-y

Abstract: The Pearl River Delta (PRD) is one of the most industrialized, urbanized and populated regions in China

Keywords： The Pearl River Delta (PRD)     Satellite monitoring     Regional air quality     Long-term trend     HCHO    

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Response of organic aerosol characteristics to emission reduction in Yangtze River Delta region

Frontiers of Environmental Science & Engineering 2023, Volume 17, Issue 9, doi: 10.1007/s11783-023-1714-0

Abstract:

● The emission reduction causes significant change in organic aerosol composition.

Keywords： Emission control     Secondary organic aerosol     Atmospheric oxidizing capacity     Holiday effects     COVID-19 lockdown    

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New 3G System——Mobile Wireless Internet

Hou Ziqiang

Strategic Study of CAE 2002, Volume 4, Issue 7,   Pages 86-92

Abstract:

A New 3G broadband mobile wireless Internet has been proposed. New 3G system has some specifications of “Beyond IMT - 2000”，but using 3G frequency and inside 3G framework. Fixed telecommunication operator can cut down the cost of feature rich voice and mobile multimedia services, by using existing fixed broadband IP network infrastructure to deploy broadband mobile wireless Internet. This is opportunity for China to lead the trend of broadband mobile wireless Internet in the world.

Keywords： 3G mobile phone     mobile internet     broadband mobile wireless internet     WLAN     TD — LAS     mobile IP     Ipv6     IP core    

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Neutralization against SARS-CoV-2 Delta/Omicron variants and B cell response after inactivated vaccination

Frontiers of Medicine 2023, Volume 17, Issue 4,   Pages 747-757 doi: 10.1007/s11684-022-0954-x

Abstract: The NAb titers against the Delta variant for the no-vaccination, one-dose, and two-dose groups decreased

Keywords： COVID-19 convalescent     SARS-CoV-2     inactivated vaccination     neutralizing antibody     B cell response    

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PPCPs in a drinking water treatment plant in the Yangtze River Delta of China: Occurrence, removal and

Xinshu Jiang, Yingxi Qu, Liquan Liu, Yuan He, Wenchao Li, Jun Huang, Hongwei Yang, Gang Yu

Frontiers of Environmental Science & Engineering 2019, Volume 13, Issue 2, doi: 10.1007/s11783-019-1109-4

Abstract:

• 39 PPCPs were investigated at a DWTP using the Yangtze River as its water source.

• Grab and continuous sampling were conducted for the comparison of data consistency.

• Ketoprofen & carbamazepine can be risk management indicators because of the high RQ.

Keywords： PPCPs     DWTP     Human health risk assessment    

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Atypical manifestations of acute coronary syndrome — throat discomfort: a multi-center observational study

Frontiers of Medicine 2022, Volume 16, Issue 4,   Pages 651-658 doi: 10.1007/s11684-021-0859-0

Abstract: To present the clinical characteristics and the misdiagnosis rate of acute coronary syndrome manifested primarily as throat discomfort, we conducted a multicentric and retrospective study in the cardiology and otorhinolaryngology departments. Records of patients with primary complaint of throat discomfort, absence of chest pain at onset, and an ultimate diagnosis of acute coronary syndrome, as well as patients with pharyngitis (as controls) were collected from May 2015 to April 2016. The patients’ main manifestations were compared. Logistic regression results showed that chest tightness, dyspnea, perspiring, and exertional throat symptoms were significantly associated with acute coronary syndrome, with odds ratios of 8.3 (95% CI 2.2−31.5), 10.9 (95% CI 1.8−66.9), 25.4 (95% CI 3.6−179.9), and 81.2 (95% CI 13.0−506.7). A total of 25 (56.82%) out of 44 acute coronary syndrome patients, who were first admitted to the otorhinolaryngology department, were misdiagnosed, with a 12% (3/25) mortality rate. Throat discomfort can be the principal manifestation of acute coronary syndrome. Such patients exhibit high misdiagnosis and mortality rates. Exertional throat symptoms, chest tightness, perspiring, and dyspnea were important indicators of acute coronary syndrome in patients whose main complaint was throat discomfort. The awareness of this condition will result in prompt diagnosis and reduce morbidity and mortality.

Keywords： acute coronary syndrome (ACS)     throat discomfort (TD)     throat pain     cardiology departments     non-cardiologic    

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Promotion of Ecological Civilization Construction in the Pearl River Delta Region

Wang Jinnan , Jiang Hongqiang , Wu Wenjun , Liu Nianlei , Duan Yang , Wang Mingxu

Strategic Study of CAE 2022, Volume 24, Issue 6,   Pages 154-163 doi: 10.15302/J-SSCAE-2022.06.014

Abstract: This study used the Pearl River Delta region as an example, summarized the achievements from the aspectsenhancing the protection and restoration capabilities of national land space; (2) promoting the Pearl River Delta

Keywords： ecological civilization     Pearl River Delta     construction mode     ecology and environment     carbon emission    

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Characterization of submicron aerosols in the urban outflow of the central Pearl River Delta region of

Zhaoheng GONG, Zijuan LAN, Lian XUE, Liwu ZENG, Lingyan HE, Xiaofeng HUANG

Frontiers of Environmental Science & Engineering 2012, Volume 6, Issue 5,   Pages 725-733 doi: 10.1007/s11783-012-0441-8

Abstract: PM ) were sampled and measured in Heshan, an urban outflow site of Guangzhou megacity in Pearl River Delta

Keywords： organic aerosol     high-resolution time-of-flight aerosol mass spectrometer (HR-ToF-AMS)     positive matrix factorization    

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Discontinuous mechanical behaviors of existing shield tunnel with stiffness reduction at longitudinal joints

Frontiers of Structural and Civil Engineering 2023, Volume 17, Issue 1,   Pages 37-52 doi: 10.1007/s11709-022-0920-3

Abstract: The opening and relative dislocation of the longitudinal joints can be calculated using Dirac delta functions

Keywords： interaction     discontinuous analysis     longitudinal joints     existing shield tunnel     Timoshenko beam     Dirac delta    

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Title Author Date Type Operation

Well-being analysis of GSU transformer insulation incorporating the impact on power generation using fuzzy logic

Alagarsamy KRISHNAVEL, Dusmata Kumar MOHANTA, M. Jaya Bharata REDDY

Journal Article

An improved delta-star switching scheme for reactive power saving in three-phase induction motors

P. RAJA,N. KUMARESAN,M. SUBBIAH

Journal Article

Energy internet in the Yangtze River Delta: opportunities, challenges, and suggestions

Zheng YAN, Jiayi HU

Journal Article

Long-term trends of fine particulate matter and chemical composition in the Pearl River Delta Economic

Xuemei WANG,Weihua CHEN,Duohong CHEN,Zhiyong WU,Qi Fan

Journal Article

attribution for mercury deposition with an updated atmospheric mercury emission inventory in the Pearl River Delta

Jiajun Liu, Long Wang, Yun Zhu, Che-Jen Lin, Carey Jang, Shuxiao Wang, Jia Xing, Bin Yu, Hui Xu, Yuzhou Pan

Journal Article

Photochemical indicators of ozone sensitivity: application in the Pearl River Delta, China

Lyumeng Ye,Xuemei Wang,Shaofeng Fan,Weihua Chen,Ming Chang,Shengzhen Zhou,Zhiyong Wu,Qi Fan

Journal Article

Space view of the decadal variation for typical air pollutants in the Pearl River Delta (PRD) region

Zifeng WANG, Min SHAO, Liangfu CHEN, Minghui TAO, Liuju ZHONG, Duohong CHEN, Meng FAN, Yang WANG, Xinhui WANG

Journal Article

Response of organic aerosol characteristics to emission reduction in Yangtze River Delta region

Journal Article

New 3G System——Mobile Wireless Internet

Hou Ziqiang

Journal Article

Neutralization against SARS-CoV-2 Delta/Omicron variants and B cell response after inactivated vaccination

Journal Article

PPCPs in a drinking water treatment plant in the Yangtze River Delta of China: Occurrence, removal and

Xinshu Jiang, Yingxi Qu, Liquan Liu, Yuan He, Wenchao Li, Jun Huang, Hongwei Yang, Gang Yu

Journal Article

Atypical manifestations of acute coronary syndrome — throat discomfort: a multi-center observational study

Journal Article

Promotion of Ecological Civilization Construction in the Pearl River Delta Region

Wang Jinnan , Jiang Hongqiang , Wu Wenjun , Liu Nianlei , Duan Yang , Wang Mingxu

Journal Article

Characterization of submicron aerosols in the urban outflow of the central Pearl River Delta region of

Zhaoheng GONG, Zijuan LAN, Lian XUE, Liwu ZENG, Lingyan HE, Xiaofeng HUANG

Journal Article

Discontinuous mechanical behaviors of existing shield tunnel with stiffness reduction at longitudinal joints

Journal Article