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The abstracted and integrated Green functions and OOP of BEM in soil dynamics

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Science China(Physics,Mechanics & Astronomy) 2008年第12期51卷 1926-1937页

作者： ding boyang YUAN JinHua PAN XiaoDong College of Civil Engineering Zhejiang University of TechnologyHangzhou 310014China

It has been generally recognized that Green function integrated with Boundary Element Method (BEM) has advantages in dimensional reduction, high accuracy and satisfaction of the radiation condition at infinity, etc. Recently, the computational technique has rapidly developed and the orient-object programming has been widely applied, whereas the attribute of abstraction and the integration of Green function employed in BEM have not been discovered yet. In this work the abstraction and integration of Green function are carried out for soil dynamics problems, and the procedure of the object-oriented calculation method is presented. Based on the Green function developed for the two-phase saturated medium, the response of the wave field to tunnel subjected to dynamic loading is calculated, and the transient solution as well as the time history of response is obtained.

关键词： saturated soil dynamics Green function abstracted integration object-oriented programming

Decoupling coefficients of dilatational wave for Biot's dynamic equation and its Green's functions in frequency domain

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Applied Mathematics and Mechanics(English Edition) 2016年第1期37卷 121-136页

作者： boyang ding A.H.D.CHENG Zhanglong CHEN City College Zhejiang University Department of Civil Engineering Zhejiang University of Technology College of Civil Engineering and Architecture University of Mississippi

Green＇s functions for Blot＇s dynamic equation in the frequency domain can be a highly useful tool for the investigation of dynamic responses of a saturated porous medium. Its applications are found in soil dynamics, seismology, earthquake engineering, rock mechanics, geophysics, and acoustics. However, the mathematical work for deriving it can be daunting. Green＇s functions have been presented utilizing an analogy between the dynamic thermoelasticity and the dynamic poroelasticity in the frequency domain using the u-p formulation. In this work, a special term ＂decoupling coefficient＂ for the decomposition of the fast and slow dilatational waves is proposed and expressed to present a new methodology for deriving the poroelastodynamic Green＇s functions. The correct- ness of the solution is demonstrated by numerically comparing the current solution with Cheng＇s previous solution. The separation of the two waves in the present methodology allows the more accurate evaluation of Green＇s functions, particularly the solution of the slow dilatational wave. This can be advantageous for the numerical implementation of the boundary element method （BEM） and other applications.

关键词： decoupling coefficient dilatational wave Biot's equation poroelastodynamic Green's function frequency domain

Coping with extremes:lowered myocardial phosphofructokinase activities and glucose content but increased fatty acids content in highland Eurasian Tree Sparrows

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Avian Research 2021年第4期12卷 699-706页

作者： boyang ding Yuliang Zhao Yanfeng Sun Qian Zhang Mo Li Ghulam Nabi Yuefeng Wu Chuan Jiang Dongming Li Key Laboratory of Animal Physiology Biochemistry and Molecular Biol-ogy of Hebei ProvinceCollege of Life SciencesHebei Normal UniversityShijiazhuang 050010China Ocean College Hebei Agricultural University066003 QinhuangdaoChina College of Life Science Cangzhou Normal University061001 CangzhouChina

Background:Efficient and selective utilization of metabolic substrates is one of the key strategies in high-altitude animals to cope with hypoxia and *** findings have shown that the energy substrate utilization of highland animals varies with evolutionary history and *** heart is a proxy for the cardiopulmonary system,and the metabolic substrate utilization in the myocardium is also under the strong selective pressure of chronically hypoxic and hypothermic ***,little information is available on the physiological adjustments in relation to metabolic substrate utilization in the myocardium for coping with high-altitude ***:We compared the metabolic enzyme activities,including hexokinase(HK),phosphofructokinase(PFK),pyruvate kinase(PK),citrate synthase(CS),carnitine palmitoyl transferase 1(CPT-1),lactic dehydrogenase(LDH),and creatine kinase(CK),and metabolic substrate contents including glucose(Glu),triglyceride(TG),and free fatty acid(FFA)in the myocardium of a typical human commensal species,Eurasian Tree Sparrows(Passer montanus)between the Qinghai-Tibet Plateau(the QTP,3230 m)and low altitude population(Shijiazhuang,80 m),and between ***:Among the seven metabolic enzymes and three substrates investigated,we identified no significant differences in PK,CPT-1,HK,CS,LDH,and CK activities and TG content of the myocardium between high and low altitude ***,the QTP sparrows had significantly lower Glu content and PFK activities but higher FFA content relative to their lowland *** addition,male sparrows had higher myocardial HK and CS activities relative to females,independent of ***:Our results showed that the QTP sparrows elevated fatty acid utilization rather than glucose preference in the myocardium relative to lowland counterpart,which contributes to uncovering both the physiological adjustments for adapting to the extreme conditions of the QTP,intraspe

关键词： Energy utilization Eurasian Tree Sparrow Metabolic enzyme Myocardium The Qinghai-Tibet Plateau

Water resource conservation promotes synergy between economy and environment in China’s northern drylands

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Frontiers of Environmental Science & Engineering 2022年第3期16卷 13-24页

作者： Yali Liu Jianqing Du boyang ding Yuexian Liu Wenjun Liu Anquan Xia Ran Huo Qinwei Ran Yanbin Hao Xiaoyong Cui Yanfen Wang College of Resources and Environment University of Chinese Academy of SciencesBeijing 100049China College of Life Sciences University of Chinese Academy of SciencesBeijing 100049China Yanshan Earth Critical Zone and Surface Fluxes Research Station University of Chinese Academy of SciencesBeijing 100049China State Key Laboratory of Remote Sensing Science Aerospace Information Research InstituteChinese Academy of SciencesBeijing 100101China Shandong Tudi Development Group Co. Ltd.Jinan 250101China CAS Center for Excellence in Tibetan Plateau Earth Sciences Chinese Academy of SciencesBeijing 100101China

Water resource availability is the major limiting factor for sustainable development in *** change intensifies the conflicting water demands between people and the environment and highlights the importance of effective water resource management for achieving a balance between economic development and environmental *** 2008,Inner Mongolia,typical dryland in northern China,proposed strict regulations on water exploitation and utilization aimed at achieving sustainable *** study is the first to investigate the effectiveness and performance of these long-standing water conservation *** analyses found that the regulations drove industrial transformation,evidenced by the decreasing proportion of environmentally harmful industries such as coal and steel,and the increasing proportion of tertiary industries(especially tourism).Following industrial transformation,economic development decoupled from industrial water consumption and subsequently led to reduced negative environmental *** on these results,adaptive strategies were developed for 12 cities by revealing and integrating their development pathways and relative status in achieving sustainable *** and cooperation between cities were proposed,e.g.,a water trade agreement between eastern Inner Mongolia(an economically underdeveloped region with relatively abundant water resources)and central Inner Mongolia(an economically developed region with high water stress).Such an agreement may enable the holistic achievement of sustainable development across *** integrating the findings of our research,our study presents a reproducible framework for water-management-based sustainable development strategies in drylands.

关键词： Water conservation Environmental protection Industry transformation Evenness Sustainable development Dryland

Solutions of Green's function for Lamb's problem of a two-phase saturated medium

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Theoretical & Applied Mechanics Letters 2011年第5期1卷 55-59页

作者： boyang ding,and Jun Chen College of Civil Engineering and Architecture,Zhejiang University of Technology,Hangzhou 310014,China College of Civil Engineering and Architecture Zhejiang University of Technology Hangzhou 310014 China

The solutions of Green’s function are significant for simplification of problem on a two-phase saturated *** transformation of axisymmetric cylindrical coordinate and Sommerfeld’s integral,superposition of the influence field on a free surface,authors obtained the solutions of a two-phase saturated medium subjected to a concentrated force on the semi-space.

关键词： Green's function two-phase saturated medium Lamb's problem

2-D Green's functions for a saturated porous medium and its numerical implementation for seismic response in BEM

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2-D Green's functions for a saturated porous medium and its ...

The U-P solutions for Lamb's problem of a poroelastic medium

中国力学大会-2017暨庆祝中国力学学会成立60周年大会

作者： boyang ding Youzheng Song Ru Zhang Zhejiang University City College

In accordance with De Hoop’s suggestion,3-D Green’s function in U-P formation for a saturated porous medium subjected to a concentrated force which has been derived by the authors in an earlier paper has been integrated in this paper,in order to obtain 2-D forms. The theoretical results subjected to a Dirac δ(t) an d Heaviside force H(t) have been presented. The numerical results of action of Heaviside force have been exploited to compare to Chen’s results in 1994. The solutions differ in form,but the numerical results are the same. Because the form of solutions in this paper is concise,a numerical implementation for seismic response of a tunnel in BEM is presented. These performances may benefit investigation aseismic issues in a saturated porous medium.

关键词： 2-D Green’s function A saturated porous medium In U-P formulation Seismic response of a tunnel,BEM

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The U-P solutions for Lamb's problem of a poroelastic medium

饱和多孔介质的二维Green函数及地震反应的BEM计算

中国力学大会-2015

作者： ding boyang Pan Ernian Zheng Pei Zhejiang University City College The University of Akron's Department of Civil Engineering School of Mechanical Engineering University of Shanghai for Science and Technology

Based on the Homlolz’s solutions for Biot’s dynamics equation and Fourier transformation,with introducing dynamic parametersξ,ξ,authors performed the decoupling of fast and slow dilational wave of Biot’s dynamic ***,through transformation of cylindrical coordinate and Sommerfeld’s identity,superposition of the influence field of a free sur-

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振动与冲击 2018年第16期37卷 62-69页

作者：魏纲宋宥整丁伯阳浙江大学建筑工程学院杭州310058 浙江大学城市学院土木工程系杭州310015

按照De Hoop的方法,通过三维解答的积分得到集中力作用下饱和多孔介质U-P形式的二维Green函数,利用耦合纵波的解耦及分波类型的奇异点处理,完成了集中力作用下半空间多孔介质动力响应的BEM计算,通过Duhamel公式积分分别给出了在输入EI C... 详细信息

按照De Hoop的方法,通过三维解答的积分得到集中力作用下饱和多孔介质U-P形式的二维Green函数,利用耦合纵波的解耦及分波类型的奇异点处理,完成了集中力作用下半空间多孔介质动力响应的BEM计算,通过Duhamel公式积分分别给出了在输入EI Centro和2008年汶川地震加速度记录后的饱和土隧道的地震响应计算。研究结果表明:隧道的地震放大作用明显;EI Centro或汶川2008地震记录作用下,隧道底部的响应均要大于中间和顶部的响应。

关键词：饱和多孔介质 U-P形式二维Green函数 BEM数值方法隧道地震响应

集中力作用下的两相饱和介质位移场Green函数

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力学学报 2001年第2期33卷 234-241页

作者：丁伯阳丁翠红孟凡丽浙江工业大学建工学院杭州310014

以复模两相饱和介质Ｂｉｏｔ动力学方程为基础，根据该方程Ｄ’Ａｌｅｍｂｅｒｔ解的Ｆｏｕｒｉｅｒ变换所属的Ｈｏｍｈｏｌｔｚ方程特性，由Ｂｉｏｔ方程解的相容性条件及δ函数性质较好地解决了快、慢纵波位势的耦合问题，较为简便地... 详细信息

以复模两相饱和介质Ｂｉｏｔ动力学方程为基础，根据该方程Ｄ’Ａｌｅｍｂｅｒｔ解的Ｆｏｕｒｉｅｒ变换所属的Ｈｏｍｈｏｌｔｚ方程特性，由Ｂｉｏｔ方程解的相容性条件及δ函数性质较好地解决了快、慢纵波位势的耦合问题，较为简便地得到了两相饱和介质在集中力作用下低频（ω＜ωｃ）时的频域和时域的Ｇｒｅｅｎ函数．

关键词：集中力两相饱和介质 Green函数位移场 Homholtz方程 δ函数