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The Combined Effects of the Tropical and Extratropical Quasi-biweekly Oscillations on the Record-setting Mei-yu Rainfall in the Summer of 2020

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Advances in Atmospheric Sciences 2023年第4期40卷 663-681,I0002-I0014页

作者： Zhen HUANG Shuanglin li jianying li Chao ZHANG Department of Atmospheric Science/Centre for Severe Weather and Climate and Hydro-geological Hazards China University of GeosciencesWuhan 430074China China Climate Change Research Center Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China State Key Laboratory of Severe Weather(LASW) Chinese Academy of Meteorological SciencesBeijing 100081China

During June-July 2020,the strongest recorded mei-yu rainfall occurred in the middle and lower reaches of the Yangtze *** rainfall processes exhibited an obvious quasi-biweekly(biweekly in brief)variability,and there are altogether five *** is found that the biweekly rainfall cycle mainly arises from the collaborative effects of biweekly variabilities from both the tropics and *** for the tropics,the biweekly meridional march and retreat of the western Pacific subtropical high(WPSH)is particularly *** for the extratropics,geopotential height anomalies near Lake Baikal are *** former is attributed to the intensified biweekly activity of the southwest-northeast oriented EastAsian Pacific wave train(EAP)originating from the tropical western Pacific,while the latter is associated with the biweekly activities of the eastward propagating Eurasia mid-high latitudinal wave train and the westward propagating North Pacific wave *** the biweekly activities of these wave trains intensified is further diagnosed from the perspective of thermodynamical forcing and also from the modulation of interannual background on intraseasonal *** is found that the strongest recorded convection anchoring over the tropical western Indian Ocean(IO)triggers anomalous descent over the tropical western Pacific,which modulates the biweekly activity of the ***,the anomalous diabatic heating over the IO causes changes of the meridional thermodynamic contrast across the IO to the high latitudes,which modulates the extratropical wave trains.A further diagnosis of barotropic kinetic energy conversion suggests that the active occurrence of two extratropical biweekly wave trains is attributed to the increased efficiency of energy conversion from basic *** westward propagation of the extratropical North Pacific wave train is attributed to the weakened and northshifted upper-level westerly,which is caused by the SST warmth near the Kuroshio

关键词： strongest recorded mei-yu rainfall in summer 2020 quasi-biweekly variability tropical convection westward propagation of the extratropical North Pacific wave train SSTA in the North Pacific

A Comparative Study on the Dominant Factors Responsible for the Weaker-than-expected El Ni?o Event in 2014

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Advances in Atmospheric Sciences 2015年第10期32卷 1381-1390页

作者： li jianying liU Boqi li Jiandong MAO Jiangyu State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics Institute of Atmospheric PhysicsChinese Academy of Sciences University of Chinese Academy of Sciences Chinese Academy of Meteorological Sciences Joint Center for Global Change Studies

Anomalous warming occurred in the equatorial central-eastern Pacific in early May 2014, attracting much attention to the possible occurrence of an extreme E1 Nifio event that year because of its similarity to the situation in early 1997. However, the subsequent variation in sea surface temperature anomalies （SSTAs） during summer 2014 in the tropical Pacific was evidently different to that in 1997, but somewhat similar to the situation of the 1990 aborted E1 Nifio event. Based on NCEP （National Centers for Environmental Prediction） oceanic and atmospheric reanalysis data, the physical processes responsible for the strength of E1 Nifio events are examined by comparing the dominant factors in 2014 in terms of the preceding instability of the coupled ocean-atmosphere system and westerly wind bursts （WWBs） with those in 1997 and 1990, separately. Although the unstable ocean-atmosphere system formed over the tropical Pacific in the preceding winter of 2014, the strength of the preceding instability was relatively weak. Weak oceanic eastward-propagating downwelling Kelvin waves were forced by the weak WWBs over the equatorial western Pacific in March 2014, as in February 1990. The consequent positive upper-oceanic heat content anomalies in the spring of 2014 induced only weak positive SSTAs in the central-eastern Pacific-unfavorable for the subsequent generation of summertime WWB sequences. Moreover, the equatorial western Pacific was not cooled, indicating the absence of positive Bjerknes feedback in early summer 2014. Therefore, the development of E1 Nifio was suspended in summer 2014.

关键词： El Nino event westerly wind burst instability of coupled ocean-atmosphere system positive Bjerknes feedback

Power loss transition of stable ZnO varistor ceramics: Role of oxygen adsorption on the stability of interface states at the grain boundary

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Journal of Advanced Ceramics 2023年第5期12卷 972-983页

作者： Zhuolin Cheng Rou li Yiwei Long jianying li Shengtao li Kangning Wu State Key Laboratory of Electrical Insulation and Power Equipment Xi’an Jiaotong UniversityXi’an 710049China Department of Thermal and Fluid Engineering University of TwenteEnschede 7500AEthe Netherlands

Highly stable ZnO varistor ceramics with steadily decreasing power loss have been put into applications in electrical and electronic systems for overvoltage protections, even with the absence of general understandings on their aging behaviors. In this paper, we investigated their aging nature via conducting comparative direct current (DC) aging experiments both in air and in nitrogen, during which variations of electrical properties and interface properties were measured and analyzed. Notably, continuously increasing power loss with severe electrical degradation was observed for the sample aged in nitrogen. The power loss transition was discovered to be closely related to the consumption of oxygen adsorption at the grain boundary (GB), which could, however, remain constant for the sample aged in air. The interface density of states (DOS) Ni, which is crucial for pinning the potential barrier, was proved to decrease in nitrogen, but keep stable in air. Therefore, it is concluded that the oxygen adsorption at the GB is significant for the stability of interface states, which further correlates to the long-term stability of modern stable ZnO varistor ceramics.

关键词： ZnO varistor ceramics aging power loss oxygen adsorption interface states

A direct bonding copper degradation monitoring method for insulated gate bipolar transistor modules: Boundary‐dependent thermal network combined with feedback control

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High Voltage 2023年第6期8卷 1264-1274页

作者： Xiaotong Zhang Zhuolin Cheng Xing Sun Kangning Wu jianying li State Key Laboratory of Electrical Insulation and Power Equipment Xi'an Jiaotong UniversityXi'anChina

The direct bonding copper(DBC)substrates of insulated gate bipolar transistor(IGBT)modules degrade inevitably under cycling thermo‐mechanical stress,causing potential threat to the reliability of IGBT ***,little attention has been paid to monitoring their *** paper proposes a DBC degradation monitoring method for IGBT modules,which combines boundary‐dependent thermal network and feedback control.A thermal network is employed to describe the internal material degradation of IGBT modules and can be extracted from a finite‐element method *** boundary conditions including power losses and DBC degradation are considered,enabling the thermal network suitable for various working conditions and different DBC degradation conditions of IGBT *** DBC degradation is characterised by its equivalent thermal conductivities measured in the thermal cycling ageing *** the basis of the boundary‐dependent thermal network,feedback control is applied to monitor DBC degradation by regulating boundary‐dependent thermal ***,the proposed model is verified from the effectiveness and accuracy of DBC degradation monitoring and junction temperature *** method casts new light on thermal network modelling and could provide a feasible method for the monitoring of DBC degradation.

关键词： network bipolar transistor

Metabolic fate of tea polyphenols and their crosstalk with gut microbiota

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Food Science and Human Wellness 2022年第3期11卷 455-466页

作者： Meiyan Wang jianying li Ting Hu Hui Zhao Tianjin Key Laboratory of Food and Biotechnology School of Biotechnology and Food ScienceTianjin University of CommerceTianjin 300134China Hubei Key Laboratory for EFGIR Huanggang Normal UniversityHuanggang 438000China

Tea represents an abundant source of naturally occurring *** polyphenols(TPs)have received growing attentions for its wide consumption in the world,and more importantly its pleiotropic bioeffects for human *** ingestion,TPs may undergo absorption and phase II reaction in the small intestine,and most undigested proportion would be submitted to the colon to interact with gut *** between gut microbiota and TPs are bidirectional,including not only bacteria-mediated TPs metabolism,e.g.,removal of gallic acid moiety and ring fission to release phenolic acid catabolites,but also TPs-based modification of bacterial *** between TPs and gut microbes may benefit for gut barrier function,for example,improvement of the intestinal permeability to alleviate ***,by reshaping microbial composition and associated metabolites,TPs may exert a systemic protection on host metabolism,which contributes to improve certain chronic metabolic *** that,further understanding of the metabolic fate of TPs and interplay with gut microbiota as well as potential health-promoting effects are of great significance to development and application of tea and their polyphenolic components in the future as dietary supplements and/or functional ingredients in medical foods.

关键词： Tea polyphenols Metabolism Gut microbiota Bioeffects

A comprehensive review on the effects of green tea and its components on the immune function

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Food Science and Human Wellness 2022年第5期11卷 1143-1155页

作者： Jiachen Sun Shengjie Dong jianying li Hui Zhao School of Biotechnology and Food Science Tianjin University of CommerceTianjin 300133China School of Pharmaceutical Science and Technology Tianjin UniversityTianjin 300072China Faculty of Education and Sports Guangdong Baiyun UniversityGuangzhou 510450China

Green tea and its bioactive components possess many health-promoting and disease-preventing benefits,especially anti-inflammatory,antioxidant,anticancer,and metabolic modulation effects with multi-target modes of *** contrast,the effects and mechanisms of tea and its components on the immune system are rarely *** study aimed to review the most potent compounds in tea that affect the immune systems and mechanisms associated with *** a result of in vitro studies,animal models,and human trials,researchers have found that green tea extracts and compounds have the possibility of modulating the innate immune system,adaptive immune system,and intestinal immune *** immune-related diseases,tea polyphenols are the most significant compounds that modify immune functions,though other compounds are being investigated and cannot be ruled *** review provides a new perspective on how the immune-regulatory effects of tea and its components are exerted on immune systems,as well as how they affect the emergence and treatment of diseases.

关键词： Green tea Active components Innate immune system Adaptive immune system Intestinal immune system

Correlation between antioxidant depletion kinetic model and ageing behaviour of cross-linked polyethylene cable insulation

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High Voltage 2023年第2期8卷 231-238页

作者： Yingying Zheng Yiwei Long Delun Yi Haoran Zhang Jian Gao Kangning Wu jianying li State Key Laboratory of Electrical Insulation and Power Equipment Xi'an Jiaotong UniversityXi'anShaanxiChina

A concise kinetic model catering for the antioxidant reaction of thermally aged crosslinked polyethylene(XLPE)cable insulation before its abrupt performance deterioration is proposed for life prediction and condition *** alternating current breakdown strength,elongation at break,carbonyl index,and pyrolysis activation energy of XLPE insulation are found to consistently display an abrupt change at a certain point of ageing *** is strongly correlated to the depletion of the antioxidant whose content gradually decreases with ageing time and drops to a critical value,after which the abrupt degradation of the above macroscopic performances *** on the simplified chain reactions of XLPE during thermal-oxidative ageing,a concise kinetic model about antioxidant prediction is accordingly established by solving the chemical kinetics *** indicates that the antioxidant content decays with the reciprocal of time before the abrupt degradation *** of antioxidant content predicted by the kinetic model at different temperatures matches well with the experimental results,and its reliability can also be proved by the Arrhenius relationship of the obtained *** kinetic model proposed herein demonstrates satisfying conciseness and thus can be highly feasible in ageing condition assessment and life predicting of XLPE insulation.

关键词： kinetic insulation depletion

Genetic interrogation of phenotypic plasticity informs genome-enabled breeding in cotton

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Journal of Genetics and Genomics 2023年第12期50卷 971-982页

作者： Yuefan Huang Zhengyang Qi jianying li Jiaqi You Xianlong Zhang Maojun Wang National Key Laboratory of Crop Genetic Improvement Hubei Hongshan LaboratoryHuazhong Agricultural UniversityWuhanHubei 430070China

Phenotypic plasticity, or the ability to adapt to and thrive in changing climates and variable environments, is essential for developmental programs in plants. Despite its importance, the genetic underpinnings of phenotypic plasticity for key agronomic traits remain poorly understood in many crops. In this study, we aim to fill this gap by using genome-wide association studies to identify genetic variations associated with phenotypic plasticity in upland cotton (Gossypium hirsutum L.). We identified 73 additive quantitative trait loci (QTLs), 32 dominant QTLs, and 6799 epistatic QTLs associated with 20 traits. We also identified 117 additive QTLs, 28 dominant QTLs, and 4691 epistatic QTLs associated with phenotypic plasticity in 19 traits. Our findings reveal new genetic factors, including additive, dominant, and epistatic QTLs, that are linked to phenotypic plasticity and agronomic traits. Meanwhile, we find that the genetic factors controlling the mean phenotype and phenotypic plasticity are largely independent in upland cotton, indicating the potential for simultaneous improvement. Additionally, we envision a genomic design strategy by utilizing the identified QTLs to facilitate cotton breeding. Taken together, our study provides new insights into the genetic basis of phenotypic plasticity in cotton, which should be valuable for future breeding.

关键词： Cotton Phenotype plasticity Genotype-environment interaction Genomic selection Genome-wide association studies

Functional mechanism on stem cells by tea(Camellia sinensis)bioactive compounds

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Food Science and Human Wellness 2022年第3期11卷 579-586页

作者： Yao Cheng Jiachen Sun Hui Zhao Hongxing Guo jianying li School of Biotechnology and Food Science Tianjin University of CommerceTianjin 300134China The Third Central Clinical College Tianjin Medical UniversityTianjin 300170China

Camellia sinensis(tea),one of the most popular commercial crops,is commonly applied in all parts of the *** main active ingredients of tea include polyphenols,alkaloids,polysaccharides,amino acids,aroma and volatile constitutes,all of which are potentially responsible for the activities of *** cells(SCs)are the immature and undifferentiated cells by a varying capacity for proliferation,self-renewal and the capability to differentiate into one or more different derivatives with specialized function or maintain their stem cell ***,a thorough review is conducted of the functional mechanism on SCs by tea bioactive compounds.

关键词： Functional mechanism Stem cell Camellia sinensis Bioactive compounds