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Spatial and temporal variation characteristics of ocean waves in the South China Sea during the boreal winter

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Acta Oceanologica Sinica 2015年第1期34卷 23-28页

作者： ZHU Geli LIN Wantao ZHAO Sen cao yanhua State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics Institute of Atmospheric PhysicsChinese Academy of Sciences Department of Mathematics and Physics North China Electric Power University University of Chinese Academy of Sciences

The spatial and temporal variation characteristics of the waves in the South China Sea （SCS） in the boreal winter during the period of 1979/1980-2011/2012 have been investigated based on the European Centre for Medium-range Weather Forecasts interim （ERA-Interim） reanalysis dataset. The results show that the lead- ing mode of significant wave height anomalies （SWHA） in the SCS exhibits significant interannual variation and a decadal shift around the mid-1990s, and features a basin-wide pattern in the entire SCS with a center located in the west of the Luzon Strait. The decadal change from a weak regime to a strong regime is mainly associated with the enhancement of winter monsoon modulated by the Pacific decadal oscillation （PDO）. The interannual variation of the SWHA has a significant negative correlation with the E1 Nino Southern Oscillation （ENSO） in the same season and the preceding autumn. For a better understanding of the physi- cal mechanism between the SCS ocean waves and ENSO, further investigation is made by analyzing atmo- spheric circulation. The impact of the ENSO on the SWHA over the SCS is bridged by the East Asian winter monsoon and Pacific-East Asian teleconnection in the lower troposphere. During the E1 Nino （La Nino）, the anomalous Philippine Sea anticyclone （cyclone） dominates over the Western North Pacific, helps to weaken （enhance） East Asian winter monsoon and then emerges the negative （positive） SWHA in the SCS.

关键词： ocean waves interannual variability South China Sea ENSO PDO

A direct method for solving projected generalized continuous-time Sylvester equations

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控制理论与应用（英文版） 2012年第3期10卷 319-324页

作者： Yiqin LIN Liang BAO yanhua cao Liping ZHOU Department of Mathematics and Computational Science Hunan University of Science and Engineering Yongzhou Hunan 425100 China Department of Mathematics East China University of Science and Technology Shanghai 200237 China Department of Mathematics North China Electric Power University Beijing 102206 China

This article is devoted to the numerical solution of a projected generalized Sylvester equation with relatively small size. Such an equation arises in stability analysis and control problems for descriptor systems including model reduction based on balanced truncation. The algebraic formula of the solution of the projected generalized continuous-time Sylvester equation is presented. A direct method based on the generalized Schur factorization is proposed. Moreover, its low-rank version for problems with low-rank right-hand sides is also proposed. The computational cost of the direct method is estimated. Numerical simulation show that this direct method has high accurncv

关键词： Projected generalized Sylvester equation Matrix pencil Generalized Schur factorization Spectral pro-jection

Theory and Application of Natural-Based Wavelet Method

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Journal of Harbin Institute of Technology(New Series) 2019年第6期26卷 86-90页

作者： yanhua cao Mengcheng Chen Baogen Xu School of Science East China Jiaotong UniversityNanchang 330013China Institute of Architecture and Civil Engineering East China Jiaotong UniversityNanchang 330013China

Wavelet method is often used in analyzing trend and period of time sequence. When using wavelet method one serious problem is different chosen wavelet basis and scale would lead to different results. Sometimes, the results vary greatly. To overcome this problem and to improve the accuracy and efficiency, a new method denoted by Natural-based Wavelet Method is introduced and extended. It can be proved that the proposed method in fact is a special class of discrete wavelet. At first, two numerical examples are designed to show the capacity of the novel method. Second, this method is applied to a precipitation series. According to wavelet analysis and short-range precipitation prediction, this precipitation exists a faintly increasing trend. Through the analysis, the studied precipitation has two major periods: 11 and 41 years. The results validate that the Natural-based Wavelet Method used in application of multi-complicated observed data is suitable. It is easy to write the source code of the proposed method. When new information appears, new information can be easily added into the original sequence, this is another advantage of the proposed method.

关键词： natural-based wavelet method long-time precipitation sequence short-range precipitation time sequence

The Influence of Preschool Teachers’Social Skills on Job Burnout:A Moderated Mediation Model

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International Journal of Mental Health Promotion 2024年第6期26卷 463-474页

作者： Yuanqing He Xinyue Yu Yu Xia yanhua cao School of Educational Science Anhui Normal UniversityWuhu241000China

Background:Teacher burnout is a serious issue in the field of education,particularly in early childhood education,where teachers face high levels of work stress and emotional labor,leading to emotional exhaustion and job ***,past research has not sufficiently explored the mechanisms of social skills,empathy,and mindfulness in mitigating teacher ***,this study aims to investigate the relationship between preschool teachers’social skills,empathy,and mindfulness with job burnout,in order to provide theoretical basis and practical guidance for reducing teacher ***:This research utilized a convenience sampling approach to target preschool teachers for a questionnaire survey.A total of 1109 questionnaires were *** ensure the quality of the data,we excluded questionnaires that were not carefully filled out in terms of lie scale questions,those with abnormal demographic variables,and outliers identified based on response ***,901 valid questionnaires were obtained,achieving a valid response rate of 81.2%.Participants’levels of social skills,empathy,mindfulness,and job burnout were assessed using the Social Skills Scale(SKS),Empathy Scale(Measure of Empathy,ME),Mindful Attention Awareness Scale(MAAS),and the Maslach Burnout Inventory-Educators Survey(MBI-ES),*** analysis was conducted using ***:After controlling for gender,age,teaching experience,educational level,grade taught,and location of the kindergarten,the study found:(1)There is a negative correlation between preschool teachers’social skills and the level of job burnout(r=−0.238);(2)Empathy has a dual-track effect on job burnout,where cognitive empathy negatively affects job burnout(r=−0.245),while emotional empathy has a positive effect(r=0.045);(3)Cognitive empathy partially mediates the relationship between social skills and job burnout(β=−0.124);(4)Mindfulness significantly impacts social skills,cognitive empathy,and job burnout(r=0.

关键词： Social skills job burnout empathy mindfulness preschool teachers

Hepatitis B virus hijacks CTHRC1 to evade host immunity and maintain replication

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Journal of Molecular Cell Biology 2015年第6期7卷 543-556页

作者： Lan Bai Wei Zhang Li Tan Hongchuan Yang Maolin Ge Chengliang Zhu Rui Zhang yanhua cao Junbo Chen Zhen Luo Wenzhe Ho Fang Liu Kailang Wu Jianguo Wu State Key Laboratory of Virology and College of Life Sciences Wuhan UniversityWuhan 430072China

HepatitisBvirus(HBV)infection causes acuteand chronic liver diseases,but is not directly *** injury results fromrepeated attempts of the cellular immune response system to control the viral ***,we investigate the roles of cellular factors and signaling pathways involved in the regulation of HBV replication to reveal the mechanism underlying HBV infection and *** collagen triple helix repeat containing 1(CTHRC1)expression is elevated in HBV-infected patients andin HBV-transfected cells through epigenetic modification and transcriptional ***1 facilitates HBV replication in cultured cells and BALB/c mice by activating the PKCa/ERK/JNK/c-Jun cascade to repress the IFN/JAK/STAT ***-activated CTHRC1 downregulates the activityof typeI interferon(IFN),theproductionof IFN-stimulatedgenes(ISGs),andthephosphorylationofsignal transducerandactivator of transcription 1/2(STAT1/2),whereas it upregulates the phosphorylation and ubiquitination of type I IFN receptors(IFNARa/b).Thus,our results showthat HBV uses a novelmechanismto hijack cellular factors and signal cascades in order to evade host antiviral immunity and maintain persistent *** also demonstrate that CTHRC1 has a novel role in viral infection.

关键词： hepatitis B virus collagen triple helix repeat containing 1(CTHRC1) immune response immune evasion PKC/JNK/ERK/c-Jun cascade IFN/JAK/STAT pathway

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二维线性Sobolev方程广义差分法

计算数学 2005年第3期27卷 243-256页

作者：曹艳华首都师范大学数学系北京100037

本文考虑了二维线性Sobolev方程的一阶广义差分法.把Sobolev方程从一维区间推广到二维区域时会产生许多的问题.本文将证明其半离散广义差分解的存在唯一性,并且通过引入Ritz-Volterra投影给出其L^p模和W^(1,p)模误差估计.

关键词： Sobolev方程一阶广义差分法误差估计广义差分法二维区域线性解的存在唯一性模误差估计半离散区间

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一维线性Sobolev方程广义差分法

高等学校计算数学学报 2006年第2期28卷 122-133页

作者：曹艳华首都师范大学数学系北京 100037

1引言Sobolev方程在流体穿过裂缝岩石的渗透理论,土壤中湿气迁移问题,不同介质中的热传导等许多数学物理问题中有着广泛的应用．Sobolev方程解的存在唯一性以及标准有限元和混合有限元已得到,但因为广义差分法是近几十年发展起来的一种... 详细信息

1引言Sobolev方程在流体穿过裂缝岩石的渗透理论,土壤中湿气迁移问题,不同介质中的热传导等许多数学物理问题中有着广泛的应用．Sobolev方程解的存在唯一性以及标准有限元和混合有限元已得到,但因为广义差分法是近几十年发展起来的一种计算方法,而且建立误差估计非常困难,所以有关广义差分法的理论并不完善．关于广义差分法的W;,p和L;模估计可参考文献[12]．本文将给出一维线性Sobolev方程的广义差分格式,通过

关键词： Sobolev equation first order generalized difference scheme error estimates.

限制加性许瓦兹预条件的变形及其在二维三温能量方程中的应用(英文)

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计算物理 2008年第6期25卷 649-658页

作者：曹艳华刘兴平谷同祥华北电力大学(北京)数理系北京102206 北京应用物理与计算数学研究所计算物理实验室北京100088

给出标准限制加性许瓦兹预条件的变形,并应用当前流行的Newton-Krylov-Schwarz方法,结合该预条件子,求解由二维三温能量方程离散得到的非线性代数方程组,减少收敛所需要的迭代次数和所需的CPU时间.数值实验表明,该方法比标准限制加性许... 详细信息

给出标准限制加性许瓦兹预条件的变形,并应用当前流行的Newton-Krylov-Schwarz方法,结合该预条件子,求解由二维三温能量方程离散得到的非线性代数方程组,减少收敛所需要的迭代次数和所需的CPU时间.数值实验表明,该方法比标准限制加性许瓦兹预条件方法收敛所需要的迭代次数和CPU时间要少.

关键词：并行计算预条件矩阵迭代求解加性许瓦兹方法能量方程

内蒙古甲乌拉银铅锌矿床成矿斑岩体锆石U-Pb年龄、地球化学特征及其成矿意义

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地质通报 2020年第2期39卷 353-364页

作者：曹艳华刘翼飞中国地质科学院矿产资源研究所北京100037 中国地质大学北京100083

内蒙古甲乌拉是大兴安岭得尔布干铜(钼)-银铅锌成矿带内大型银铅锌矿床之一。对矿区内与成矿有关的花岗斑岩、石英斑岩开展了年代学和地球化学研究。其中花岗斑岩锆石206Pb/238U年龄为141.9±0.5 Ma,形成于早白垩世。岩石地球化学特征表... 详细信息

内蒙古甲乌拉是大兴安岭得尔布干铜(钼)-银铅锌成矿带内大型银铅锌矿床之一。对矿区内与成矿有关的花岗斑岩、石英斑岩开展了年代学和地球化学研究。其中花岗斑岩锆石206Pb/238U年龄为141.9±0.5 Ma,形成于早白垩世。岩石地球化学特征表明,成矿斑岩体花岗斑岩、石英斑岩具有准铝质-弱过铝质和高钾钙碱性-钾玄质的特征;富集大离子亲石元素Rb、K及亲流体的高场强元素U、Th、Pb等,亏损Sr、Ba等大离子亲石元素,强烈亏损Nb、Ta、Ti等高场强元素,其岩浆源区可能由地幔熔体和新生地壳熔体混合形成。成矿斑岩体形成于蒙古-鄂霍茨克洋闭合后,由同碰撞造山环境向非造山板内环境转换的碰撞后伸展环境内。目前认为,成矿的花岗斑岩、石英斑岩岩体更可能是矿床与提供成矿物质和热液的深部岩浆房之间的通道,深部岩浆房晚期分异的富水熔体相在浅部就位形成石英斑岩、花岗斑岩体,其不断出溶的流体在岩体的外围形成了甲乌拉矿床。

关键词：成矿斑岩 LA-ICP-MS锆石U-Pb年龄地球化学早白垩世甲乌拉银-铅-锌矿床