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轴承电腐蚀对风电功率的影响研究

轴承电腐蚀对风电功率的影响研究

作者： nay min aung 华北电力大学(北京)

学位级别：硕士

风力发电已成为最有前途的可再生能源之一,风力发电装机和发电量越来越大。在风力发电机传动系统中,发电机轴承在电力传输和负载支撑中起着至关重要的作用,其中发电机轴承因轴电流引起轴承电腐蚀,导致轴承失效。因此,了解电腐蚀对发电... 详细信息

风力发电已成为最有前途的可再生能源之一,风力发电装机和发电量越来越大。在风力发电机传动系统中,发电机轴承在电力传输和负载支撑中起着至关重要的作用,其中发电机轴承因轴电流引起轴承电腐蚀,导致轴承失效。因此,了解电腐蚀对发电机轴的影响对保证风力发电的可靠性至关重要。主要工作内容和结果如下:1、对因轴电流导致的发电机轴承电蚀损伤的SCADA数据进行分析,发现轴承温度异常变化是电蚀发生的前兆。使用三种算法从高维信息中提取有用的特征信息,并引入发电量预测模型。在现有数据下,风力发电机轴承温度达到100度以上,将导致轴承发生电腐蚀故障。2、采用载流试验机模拟了轴电流轴承表面电腐蚀的发生条件,研究了轴电流对摩擦副的影响。发现当电压为1V时接触电阻达到40mΩ,并且在30分钟后发生电腐蚀。3、基于轴电流损伤和正常风机SCADA数据,采用SVM回归(SVM-reg)、LSTM和ARIMA模型,对比了两类风机的发电量,发现正常的风力发电机在6个月内平均可发电1.68MW,而电蚀导致停机风机的发电不足正常风机的50%。

关键词：电蚀腐蚀轴承磨损和接触电阻算法风功率

Multiple Uplift and Exhumation of the Southeastern Tibetan Plateau:Evidence from Low-Temperature Thermochronology

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Acta Geologica Sinica(English Edition) 2024年第3期98卷 569-584页

作者： WU Limin PENG Touping FAN Weiming ZHAO Guochun GAO Jianfeng DONG Xiaohan PENG Shili min Kang Tin aung MYINT State Key Laboratory of Isotope Geochemistry Guangzhou Institute of GeochemistryChinese Academy of SciencesGuangzhou 510640China Chinese Academy of Sciences Center for Excellence in Deep Earth Science Guangzhou 510640China University of Chinese Academy of Sciences Beijing 100049China Chinese Academy of Sciences Center for Excellence in Tibetan Plateau Earth Sciences Beijing 100101China Department of Earth Sciences The University of Hong KongHong Kong 999077China State Key Laboratory of Ore Deposit Geochemistry Institute of GeochemistryChinese Academy of SciencesGuiyang 550081China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) ZhuhaiGuangdong 519085China Department of Geology University of MandalayMandalay 05011Myanmar

Since the Cenozoic,the Tibetan Plateau has experienced large-scale uplift and outgrowth due to the India-Asia ***,the mechanism and timing of these tectonic processes still remain ***,using apatite fission track dating and inverse thermal modeling,we explore the mechanism of different phases of rapid cooling for different batholiths and intrusions in the southeastern Tibetan *** contrast to previous views,we find that the coeval granitic batholith exposed in the same tectonic zone experienced differential fast uplift in different sites,indicating that the present Tibetan Plateau was the result of differential uplift rather than the entire lithosphere uplift related to lithospheric collapse during Cenozoic *** addition,we also suggest that the 5-2 Ma mantle-related magmatism should be regarded as the critical trigger for the widely coeval cooling event in the southeastern Tibetan Plateau,because it led to the increase in atmospheric CO_(2)level and a hotter upper crust than before,which are efficient for suddenly fast rock weathering and ***,we propose that the current landform of the southeastern Tibetan Plateau was the combined influences of tectonic and climate.

关键词： apatite fission track rapid cooling differential uplift magmatism southeastern Tibetan Plateau

Dynamic changes of rumen microbiota and serum metabolome revealed increases in meat quality and growth performances of sheep fed bio‑fermented rice straw

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Journal of Animal Science and Biotechnology 2024年第3期15卷 1207-1226页

作者： Yin Yin Kyawt min aung Yao Xu Zhanying Sun Yaqi Zhou Weiyun Zhu Varijakshapanicker Padmakumar Zhankun Tan Yanfen Cheng Laboratory of Gastrointestinal Microbiology National Center for International Research on Animal Gut NutritionNanjing Agricultural UniversityNanjing 210095China Department of Animal Nutrition University of Veterinary ScienceNay Pyi Taw 15013Myanmar International Livestock Research Institute Nairobi 00100Kenya College of Animal Science Tibet Academy of Agricultural and Animal Husbandry SciencesLhasa 850000China State Key Laboratory of Grassland Agro‑Ecosystems Center for Grassland MicrobiomeCollege of Pastoral Agriculture Science and TechnologyLanzhou UniversityLanzhou 730000China

Background Providing high-quality roughage is crucial for improvement of ruminant production because it is an essential component of their *** previous study showed that feeding bio-fermented rice straw(BF)improved the feed intake and weight gain of ***,it remains unclear why feeding BF to sheep increased their feed intake and weight ***,the purposes of this research were to investigate how the rumen micro-biota and serum metabolome are dynamically changing after feeding BF,as well as how their changes influence the feed intake,digestibility,nutrient transport,meat quality and growth performances of *** growing Hu sheep were allocated into 3 groups:alfalfa hay fed group(AH:positive control),rice straw fed group(RS:negative control)and BF fed group(BF:treatment).Samples of rumen content,blood,rumen epithelium,muscle,feed offered and refusals were collected for the subsequent *** Feeding BF changed the microbial community and rumen fermentation,particularly increasing(P<0.05)relative abundance of Prevotella and propionate production,and decreasing(P<0.05)enteric methane *** histomorphology(height,width,area and thickness)of rumen papillae and gene expression for carbohydrate trans-port(MCT1),tight junction(claudin-1,claudin-4),and cell proliferation(CDK4,Cyclin A2,Cyclin E1)were improved(P<0.05)in sheep fed ***,serum metabolome was also dynamically changed,which led to up-regulating(P<0.05)the primary bile acid biosynthesis and biosynthesis of unsaturated fatty acid in sheep fed *** a result,the higher(P<0.05)feed intake,digestibility,growth rate,feed efficiency,meat quality and mono-unsaturated fatty acid concentration in muscle,and the lower(P<0.05)feed cost per kg of live weight were achieved by feeding *** Feeding BF improved the growth performances and meat quality of sheep and reduced their feed ***,bio-fermentation of rice straw could be an innovative way for improving rum

关键词： Bio-fermentation Growth rate Meat quality Metabolome Microbiota Rice straw

Current progress in application of 1-Methylcyclopropene to improve postharvest quality of cut flowers

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Horticultural Plant Journal 2022年第6期8卷 676-688页

作者： aung Htay Naing nay Myo Win Swum Yi Kyu In-Kyu Kang Chang Kil Kim Department of Horticulture Kyungpook National UniversityDaegu 41566South Korea Apple Research Institute National Institute of Horticultural and Herbal ScienceRDAGunwi 39000South Korea

Floral senescence or petal abscission that determine cut flower quality and longevity are primarily caused by the regulation of endogenous ethylene and perception of endogenous and exogenous ethylene in floral organs(such as the petals and gynoecium),in ethylene-sensitive *** attempts have been made to prolong flower quality and longevity using silver ions and other chemicals that inhibit ethylene production and perception in floral *** the available compounds,1-methylcyclopropene(1-MCP)has been increasingly used as ethylene-action/perception inhibitor because of its ability to inhibit ethylene action/perception and it is environmentally *** 1-MCP has been used in several cut flower crops for about 25 years,there has been no review yet that critically emphasizes the benefits or difficulties of using this compound for the prolongation of cut flower quality and ***,we outline the role of 1-MCP in inhibiting ethylene action/perception and petal senescence in cut flowers through the blocking of receptor binding sites,and we discuss how various factors affecting efficacy of 1-MCP(such as concentration,treatment time and temperature,genotype,and flower stage)are involved in the achievement of flower ***,we highlight the advantages of applying nonvolatile and liquid 1-MCP formulation types,as opposed to using the conventional 1-MCP treatment(powder formulation type).We expect that this review will provide useful information for the future utilization of 1-MCP for the maintenance of cut flower longevity.

关键词： 1-methylcyclopropene(1-MCP) Formulation types Cut flowers Ethylene perception Ethylene binding site Floral senescence Flower quality

Exploring the genetic basis of pre-harvest sprouting in rice through a genome-wide association study-based haplotype analysis

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Journal of Integrative Agriculture 2024年第8期23卷 2525-2540页

作者： Myeong-Hyeon min Aye Aye Khaing Sang-Ho Chu Bhagwat Nawade Yong-Jin Park Department of Plant Resources College of Industrial SciencesKongju National UniversityYesan 32439Republic of Korea Department of Agronomy Yezin Agricultural UniversityNay Pyi Taw 15013Myanmar

Pre-harvest sprouting(PHS)poses a significant global challenge to cereal production,impacting both yield and *** this study,we employed genome-wide association studies(GWAS)on diverse rice accessions to identify novel PHS-associated *** assessment of 127 cultivated accessions for panicle germination(PHS)and detached grain germination(germination rate of detached grains at the 14th day(D14))revealed considerable phenotypic variation among rice *** analysis identified 91 significant signals at–log10(P-value)>5,including 15SNPs for PHS and 76 SNPs for D14.A subsequent linkage disequilibrium(LD)block-based GWAS analysis detected 227 significant SNPs for both traits,consisting of 18 nonsynonymous substitutions located on the coding regions of nine *** haplotype analysis identified 32 haplotypes,with 10 specific to cultivated accessions,19 specific to the wild type,and three shared between them.A phenotypic assessment of major haplotypes revealed significant differences between resistant(Hap1 and Hap2)and susceptible haplotypes(Hap5,Hap27,and Hap28),distinguished by a G/A SNP within a novel gene,*** identified haplotypes offer promising prospects for haplotypebased breeding aimed at enhancing PHS resistance in rice.

关键词： rice PHS dormancy germination GWAS haplotype abiotic stress

Global wild rice germplasm resources conservation alliance:World Wild-Rice Wiring

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Molecular Plant 2024年第4期17卷 516-518页

作者： Xiaoming Zheng Disna Ratnasekera Jiayu Fan Robert J.Henry Beng-Kah Song Kenneth M.Olsen Bal Krishna Joshi Maria Celeste N.Banaticla-Hilario Tonapha Pusadee Adane Getachew Melaku Yeyinou Laura Estelle Loko Koukham Vilayheuang Gavers K.Oppong Samuel Aduse Poku Peterson W.Wambugu Song Ge Aldo Merotto Junior Ohn Mar aung Ramaiah Venuprasad Ajay Kohli Wenbin Zhou Qian Qian National Key Facility for Crop Gene Resources and Genetic Improvement Institute of Crop SciencesChinese Academy of Agricultural SciencesBeijing 100081China Sanya National Research Institute of Breeding in Hainan Chinese Academy of Agricultural SciencesBeijing 100081China International Rice Research Institute DAPO Box 7777Metro Manila 4031Philippines Department of Agricultural Biology Faculty of AgricultureUniversity of RuhunaMatara 81000Sri Lanka Yazhouwan National Laboratory No.8 Huanjin RoadYazhou DistrictSanya CityHainan Province 572024China Hainan University Haikou 570228China ARC Centre of Excellence for Plant Success in Nature and Agriculture University of QueenslandBrisbaneQLD4072Australia School of Science Monash University Malaysia47500 Bandar SunwaySelangor 47500Malaysia Department of Biology Washington University in St.LouisSt.LouisMO 63130-4899USA National Agriculture Genetic Resources Center(Genebank) KhumaltarPO Box 3055KathmanduNepal Plant Biology Division Insttute of Biological SciencesUniversity of the Pilippines Los BanosLos BanosLaguna 4031Philippines Division of Agronomy Department of Plant and Soil SciencesFaculty of AgricultureChiang Mai UniversityChiang Mai 50200Thailand Bio and Emerging Technology Institute Addis Ababa 1165Ethiopia National University of Sciences TechnologiesEngineering and Mathematics(UNSTIM)Dassa-ZouméBP 14Benin National Genebank Rice and Cash Crops Research CenterNAFRIVientiane 0605Lao PDR Plant Sciences and the Bioeconomy Rothamsted ResearchHarpenden AL52JQUK UK Future Food Beacon of Excellence and School of Biosciences and University of Nottingham Nottingham LE125RDUK Department of Plant and Environmental Biology University of GhanaAccraGhana Kenya Agricultural and Livestock Research Organization Genetic Resources Research InstituteNairobi 00200Kenya Institute of Botany Chinese Academy of SciencesBeijing 100093China Federal University of Rio Grande do Sul UFRGSPorto Alegre 91501-970RSBrazil Department of Agricultur

Wild relatives of crop are key genetic resources serving as diversity reservoirs for crop improvement under changing ***(Oryza sativa)is one of the most important crops in the world,providing staple food for half of the world's *** rice is thus a critical germplasm resource for sustained global food security,ensuring high production yields,improved quality,and stress resistance in the face of climate *** rice is closely related to domesticated rice and has a rich genetic diversity and exceptional adaptability to extreme *** has played a pivotal role in the history of rice hybridization and has become a key resource for rice breeding *** identification of wild-type cytoplasmic male sterility resources paved the way for the achievement of the“three lines”goal in hybrid rice,leading to a significant increase in rice *** addition,the use of resistance alleles found in wild rice is making rice production more resilient to losses caused by environmental ***,wild rice germplasm resources are threatened due to habitat destruction and other anthropogenic *** the same time,the lack of centralized distribution of wild rice has hampered the sharing of basic information on wild rice resources and the utilization and conservation of wild rice in each country,as well as collaboration among scientists.

关键词： germplasm breeding crops

煅烧温度对铌酸钾钠基铁电陶瓷压电性能的影响

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硅酸盐学报 2024年第6期52卷 1935-1941页

作者：王孟丽桑秀杰周静李芳李敏潍坊职业学院山东潍坊262737 池州学院安徽池州247000

铁电陶瓷在电场下产生应变性能,是制备致动器的关键元件。多相共存结构的铁电陶瓷产生大应变,除了组成,混合料煅烧条件影响相结构和应变性能。采用传统固相烧结法制备0.97KNNS–0.03BNKZ (0.97(K_(0.48)Na_(0.52))(Nb_(0.97)Sb_(0.03))O... 详细信息

铁电陶瓷在电场下产生应变性能,是制备致动器的关键元件。多相共存结构的铁电陶瓷产生大应变,除了组成,混合料煅烧条件影响相结构和应变性能。采用传统固相烧结法制备0.97KNNS–0.03BNKZ (0.97(K_(0.48)Na_(0.52))(Nb_(0.97)Sb_(0.03))O_(3)–0.03Bi_(0.5)(K_(0.48)Na_(0.52))_(0.5)ZrO_(3))铁电陶瓷,研究混合料煅烧温度在600~950℃范围内对陶瓷的直径收缩率、微观形貌、晶体结构、介电性能、铁电性能和应变性能的影响。结果表明,随混合料煅烧温度的增加,陶瓷直径收缩率先增加至8.5%然后减小;陶瓷平均晶粒尺寸先减小后增加至0.48μm;所有陶瓷晶体具有畸变的正交结构;Curie温度从280℃增加到320℃,相应地最大介电常数从4 520增加到7 769;最大极化强度先减小后增加,最高达到35μC/cm^(2)。煅烧温度为950℃时,陶瓷在40 kV/cm电场下其双极应变达到0.3%,原因在于铁电畴易翻转;其它煅烧温度制备的陶瓷其应变性能在0.25%左右,区别不大。

关键词：煅烧铌酸钾钠陶瓷压电性能

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Shearing Characteristics of Jurassic Silty Mudstone Slip Zone under Different Water Contents and Normal Stresses Based on Ring Shear Tests

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Journal of Earth Science 2022年

作者： Nang Mon Mon Thaw Changdong Li Zongxing Zou Wenqiang Chen Jingjing Long aung min Oo Dafalla Wadi Faculty of Engineering China University of Geosciences Badong National Observation and Research Station of Geohazards China University of Geosciences Department of Geology Hpa-An University 4. Department of Hydrogeology and Engineering Geology College of Petroleum Geology and Minerals University of Bahri

Landslides frequently occurred in Jurassic red strata in the Three Gorges Reservoir(TGR) region in China. The Jurassic strata consist of low mechanical strength and poor permeability of weak silty mudstone layer, which may cause slope instability during rainfall. In order to understand the strength behavior of Jurassic silty mudstone shear zone, the so-called Shizibao landslide located in Guojiaba Town, Zigui County, Three Gorges Reservoir(TGR) in China is selected as a case study. The shear strength of the silty mudstone shear zone is strongly influenced by the water content and normal stress. Therefore, a series of drained ring shear tests were carried out by changing the water contents(7%, 12%, 17%, and 20%, respectively) and normal stresses(200, 300, 400, and 500 k Pa, respectively).The result revealed that the residual friction coefficient and residual friction angle were power function relationships with water content and normal stress. The peak cohesion of the silty mudstone slip zone increased with water content to a certain limit, above which the cohesion decreased. In contrast, the residual cohesion showed the opposite trend, indicating the cohesion recovery above a certain limit of water content. However, both the peak and residual friction angle of the silty mudstone slip zone were observed to decrease steadily with increased water content. Furthermore, the macroscopic morphological features of the shear surface showed that the sliding failure was developed under high normal stress at low water content, while discontinuous sliding surface and soil extrusion were occurred when the water content increased to a saturated degree. The localized liquefaction developed by excess pore water pressure reduced the frictional force within the shear zone. Finally, the combined effects of the slope excavation and precipitation ultimately lead to the failure of the silty mudstone slope; however, continuous rainfall is the main factor triggering sliding.

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东喜马拉雅构造结快速隆升时期:来自缅甸中央盆地沉积学证据

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地球科学 2022年第7期47卷 2573-2585页

作者：鲁毅崔宇驰 Si Si Thu Kyaw Kyaw Khing Myo min aung 朱伟林邵磊同济大学海洋地质国家重点实验室上海200092

东喜马拉雅构造结快速隆升时间以及雅鲁藏布江和伊洛瓦底江是否曾经相连已经争论了超过半个世纪.采用锆石U-Pb年代学等方法,对缅甸中央盆地新生代地层的“源-汇”路径开展研究.缅甸中央盆地始新统发育大量铬尖晶石、各坳陷的锆石年龄谱... 详细信息

东喜马拉雅构造结快速隆升时间以及雅鲁藏布江和伊洛瓦底江是否曾经相连已经争论了超过半个世纪.采用锆石U-Pb年代学等方法,对缅甸中央盆地新生代地层的“源-汇”路径开展研究.缅甸中央盆地始新统发育大量铬尖晶石、各坳陷的锆石年龄谱各不相同,表明该时期沉积物以盆地周边隆起为主要物源,不存在统一的源区;渐新世之后,源自区域变质岩的重矿物组合比例逐渐增加,盆地各坳陷碎屑锆石年龄谱特征趋于一致,均以40~70 Ma的主峰以及80~110 Ma次峰为特征,表明沉积物源区进入抹谷变质带,伊洛瓦底江雏形已经形成;由于缅甸中央盆地渐新统至下中新统完全没有喜马拉雅造山带信息,认为该时期雅鲁藏布江-伊洛瓦底江并未相连.晚中新世-更新世,喜马拉雅造山带特征组合十字石和蓝晶石以及110~130 Ma年龄峰的出现,表明伊洛瓦底江已经侵蚀到东喜马拉雅构造结,达到现今流域规模.因此,东喜马拉雅构造结快速隆升的时间大约在晚中新世.

关键词：青藏东南缘缅甸中央盆地河流演化锆石U-Pb定年重矿物物源分析地质年代学