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Dissipative Travelling Wave Solution for El Nio Tropic Sea-air Coupled Oscillator

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Chinese Geographical Science 2010年第3期20卷 275-280页

作者： WEN Zhaohui lin Wantao lin yihua MO Jiaqit Institute of Applied Mathematics School of Statistics and Applied Mathematics Anhui University of Finance and Economics Bengbu 233030 China State Key Laboratory of Numerical Modeling for Atmospheric and Geophysical Fluid Dynamics Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China Anhui Normal University Wuhu 241000 China Division of Computational Science E-Institutes of Shanghai Universities at Shanghai Jiaotong Uinversity Shanghai 200240 China

El Nifio and Southern Oscillation （ENSO） is an interannual phenomenon involved in the tropical Pacific sea-air interactions. An asymptotic method of solving equations for the ENSO model is proposed. Based on a class of oscillator of ENSO model and by employing a simple and valid method of the variational iteration, the coupled system for a sea-air oscillator model of interdecadal climate fluctuations is studied. Firstly, by introducing a set of functionals and computing the variationals, the Lagrange multipliers are obtained. And then, the generalized variational iteration expressions are constructed. Finally, by selecting appropriate initial iteration, and from the iterations expressions, the approximations of solution for the sea-air oscillator ENSO model are solved successively. The approximate dissipative travelling wave solution of equations for corresponding ENSO model is studied. It is proved from the results that the method of the variational iteration can be used for analyzing the sea surface temperature anomaly in the equatorial Pacific of the sea-air oscillator for ENSO model.

关键词： El Nifio-Southem Oscillator model variational iteration sea-air oscillator

Perturbed Solving Method for Interdecadal Sea-air Oscillator Model

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Chinese Geographical Science 2012年第1期22卷 42-47页

作者： MO Jiaqi lin yihua lin Wantao CHEN Lihua Department of Mathematics Anhui Normal University Wuhu 241003 China Division of Computational Science E-Institutes of Shanghai Universities at Shanghai Jiaotong University Shanghai 200240 China State Key Laboratory of Numerical Modeling for Atmospheric Sciencens and Geophysical Fluid Dynamic Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China Department of Mathematics and Computer Science Fuqing Branch of Fujian Normal University Fuqing 350300 China

A coupled system of the interdecadal sea-air oscillator model is studied. The E1 Nifio-southem oscillation （ENSO） atmospheric physics oscillation is an abnormal phenomenon involved in the tropical Pacific ocean-atmosphere interactions. The oscillator model is involved with the variations of both the eastern and western Pacific anomaly pat- terns. This paper proposes an ENSO atmospheric physics model using a method of the perturbation theory. The aim is to create an asymptotic solving method for the ENSO model. Employing the perturbed method, the asymptotic solution of corresponding problem is obtained, and the asymptotic behaviour of the solution is studied. Thus we can obtain the prognoses of the sea surface temperature anomaly and related physical quantities.

关键词： nonlinear equation perturbation E1 Nifio-southern oscillator model interdecadal sea-air oscillator

Variational iteration solving method for El Nio phenomenon atmospheric physics of nonlinear model

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Acta Oceanologica Sinica 2005年第5期24卷 35-38页

作者： MO Jiaqi WANG Hui lin Wantao lin yihua Anhui Normal University Wuhu 241000 China Division of Computional Science E-Institute of Shanghai Universities Shanghai Jiaotong University Shanghai 200240 China Chinese Academy of Meteorological Sciences Beijing 100081 China State Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics Institute of Atmosheric Physics Chinese Academy of Sciences Beijing 100029 China

A class of E1 Niйo atmospheric physics oscillation model is considered. The E1 Niйo atmospheric physics oscillation is an abnormal phenomenon involved in the tropical Pacific ocean-atmosphere interactions. The conceptual oscillator model should consider the variations of both the eastern and western Pacific anomaly patterns. An E1 Niйo atmospheric physics model is proposed using a method for the variational iteration theory. Using the variational iteration method, the approximate expansions of the solution of corresponding problem are constructed. That is, firstly, introducing a set of functional and accounting their variationals, the Lagrange multiplicators are counted, and then the variational iteration is defined, finally, the approximate solution is obtained. From approximate expansions of the solution, the zonal sea surface temperature anomaly in the equatorial eastern Pacific and the thermocline depth anomaly of the sea-air oscillation for E1 Niйo atmospheric physics model can be analyzed. E1 Niйo is a very complicated natural phenomenon. Hence basic models need to be reduced for the sea-air oscillator and are solved. The variational iteration is a simple and valid approximate method.

关键词： nonlinear variational iteration method E1 Niйo phenomenon

The strengthening East Asia summer monsoon since the early 1990s

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Chinese Science Bulletin 2012年第13期57卷 1553-1558页

作者： LIU HaiWen ZHOU TianJun ZHU YuXiang lin yihua Plateau Atmosphere and Environment Key Laboratory of Sichuan Province College of Atmospheric SciencesChengdu University of Information TechnologyChengdu 610225China State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China Chongqing Institute of Meteorological Sciences Chongqing 401147China China Meteorological Administration Training Centre Beijing 100081China

Previous studies have documented a weakening tendency of the East Asian summer monsoon (EASM) since the end of the 1970s. In this study, we report that the EASM has been recovering since the early 1990s, although its strength is still less than in previous decades (averaged over the period 1965-1980). Following the recovery of the EASM, there has been a tendency in the last decade toward northward-moving rainbands and excessive rainfall in the Huaihe River valley (110°-120°E, 30°-35°N). There is evidence suggesting that the strengthening EASM since the early 1990s is linked to interdecadal change of land-sea thermal contrast.

关键词：东亚夏季风年代际变化夏季季风淮河流域平均值雨带

PERTURBED METHOD FOR SEA-AIR OSCILLATOR MODEL OF INTERDECADAL CLIMATE FLUCTUATIONS

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Journal of Systems Science & Complexity 2006年第3期19卷 409-413页

作者： Jiaqi MO yihua lin Hui WANG Department of Mathematics Anhui Normal University Wuhu 241000 Division of Computational Science E- Institutes of Shanghai Universities at Shanghai Jiaotong University Shanghai 200240 China. State Key Laboratory of Numerical Modeling for Atmospheric Science and Geophysical Fluid Dynamics Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China. Chinese Academy of Meteorological Sciences Beijing 100081 China.

A coupled system of sea-air oscillator model is studied. Using the perturbed theory, the approximations of the solution for the sea-air oscillator model are obtained.

关键词： E1 Nifio-Southern oscillator model nonlinear perturbation.

Slow wave in barotropic atmosphere

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Chinese Science Bulletin 2003年第S2期48卷 68-70页

作者： lin yihua LASG, Institute of Atmospheric Physies. Chinese Academy of Sciences, Beijing 100029, China Chinese Acad Sci Inst Atmospher Phys LASG Beijing 100029 Peoples R China

In barotropic atmosphere, slow wave solution isobtained from linear primitive equation in the one dimensioncase; here the slow wave behaves very similarly to Rossbywave. The existence of the slow wave depends on the merid-ional structure of the basic flow instead of the ft effect. Thecharacter of the slow wave is almost the same as Rossbywave if the profile of basic flow is the convex function abouty.

关键词： linear barotropic atmosphere primitive equation slow wave meridional structure of basic flow.

Identification of potential anti-pneumonia pharmacological components of Glycyrrhizae Radix et Rhizoma after the treatment with Gan An He Ji oral liquid

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Journal of Pharmaceutical Analysis 2022年第6期12卷 839-851页

作者： Xiaojuan Jiang yihua lin Yunlong Wu Caixia Yuan Xuli Lang Jiayun Chen Chunyan Zhu Xinyi Yang Yu Huang Hao Wang Caisheng Wu Fujian Provincial Key Laboratory of Innovative Drug Target Research and State Key Laboratory of Cell Stress Biology School of Pharmaceutical SciencesXiamen UniversityXiamenFujian361102China Department of Respiratory and Critical Care Medicine The Third Clinical Medical CollegeFujian Medical UniversityFuzhou350122China Department of Respiratory and Critical Care Medicine The First Affiliated Hospital of Xiamen UniversityXiamenFujian361003China Laboratory of Pharmacology/Beijing Key Laboratory of Antimicrobial Agents Institute of Medicinal BiotechnologyChinese Academy of Medical Sciences and Peking Union Medical CollegeBeijing100050China School of Pharmacy Ningxia Medical UniversityYinchuan750004China School of Pharmacy Minzu University of ChinaBeijing100081China Key Laboratory of Ethnomedicine(Minzu University of China) Ministry of EducationBeijing100081China Institute of National Security Minzu University of ChinaBeijing100081China

Glycyrrhizae Radix et Rhizoma,a traditional Chinese medicine also known as Gan Cao(GC),is frequently included in clinical prescriptions for the treatment of ***,the pharmacological components of GC for pneumonia treatment are rarely *** An He Ji oral liquid(GAHJ)has a simple composition and contains GC liquid extracts and paregoric,and has been used clinically for many ***,GAHJ was selected as a compound preparation for the study of GC in the treatment of *** conducted an in vivo study of patients with pneumonia undergoing GAHJ treatments for three *** the intelligent mass spectrometry data-processing technologies to analyze the metabolism of GC in vivo,we obtained 168 related components of GC in humans,consisting of 24 prototype components and 144 metabolites,with 135 compounds screened in plasma and 82 in *** analysis of the metabolic transformation relationship and relative exposure,six components(liquiritin,liquiritigenin,glycyrrhizin,glycyrrhetinic acid,daidzin,and formononetin)were selected as potential effective *** experimental results based on two animal pneumonia models and the inflammatory cell model showed that the mixture of these six components was effective in the treatment of pneumonia and lung injury and could effectively downregulate the level of inducible nitric oxide synthase(iNOS).Interestingly,glycyrrhetinic acid exhibited the strongest inhibition on iNOS and the highest exposure in *** following molecular dynamic simulations indicated a strong bond between glycyrrhetinic acid and ***,the current study provides a pharmaceutical basis for GC and reveals the possible corresponding mechanisms in pneumonia treatment.

关键词： Glycyrrhizae Radix et Rhizoma Pneumonia Active components Inducible nitric oxide synthase Glycyrrhetinic acid

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综合全局寻优中遗传算法部分选择操作的研究

石油地球物理勘探 2000年第5期35卷 641-650页

作者：林依华石油地球物理勘探局研究院

遗传算法是综合全局寻优算法的重要组成部分。遗传算法的基本操作包括选择、交叉、变异等。选择操作就是从群体中选择优胜的个体 ,淘汰劣质个体。采用不同的选择操作直接影响着进化过程。本文在研究蒙特卡罗 (Monte Carlo)和最佳个体保... 详细信息

遗传算法是综合全局寻优算法的重要组成部分。遗传算法的基本操作包括选择、交叉、变异等。选择操作就是从群体中选择优胜的个体 ,淘汰劣质个体。采用不同的选择操作直接影响着进化过程。本文在研究蒙特卡罗 (Monte Carlo)和最佳个体保留方法 (Elitist Model)的基础上 ,引入排挤思想 ,提出了可以隔代遗传的综合选择操作方法。通过大量的理论验证 ,证明本文提出的综合选择操作优于传统的 Monte Carlo选择操作。在实际资料的应用中 ,采用综合寻优法求解剩余静校正量取得了满意的效果。

关键词：综合全局寻优遗传算法选择操作剩余静校正

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正压地转流的空间不稳定

大气科学 2024年第3期48卷 837-842页

作者：林一骅中国科学院大气物理研究所大气科学和地球流体力学数值模拟国家重点实验室(LASG) 北京100029 中国科学院大学地球与行星科学学院北京100049

与时间不稳定一样,空间不稳定也是地球流体中扰动发生发展的重要机制。基于标准模方法,研究了正压地转流对于小扰动的空间不稳定问题,并得到发生空间不稳定的必要条件。该必要条件指出,若正压地转流可能发生空间不稳定,其位涡对于纬度... 详细信息

与时间不稳定一样,空间不稳定也是地球流体中扰动发生发展的重要机制。基于标准模方法,研究了正压地转流对于小扰动的空间不稳定问题,并得到发生空间不稳定的必要条件。该必要条件指出,若正压地转流可能发生空间不稳定,其位涡对于纬度的偏微商与小扰动相对于该地转流的相速必须在某些纬度带异号。在附加适当的限制的情况下,空间不稳定与时间不稳定满足相同的必要条件,即Rayleigh–Kuo定理和Fjørtoft定理。

关键词：地转流动正压空间不稳定必要条件