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A numerical framework for underground structures in layered ground under inclined P-SV waves using stiffness

《结构与土木工程前沿（英文）》 2023年第17卷第1期页码 10-24 doi: 10.1007/s11709-022-0904-3

摘要： A numerical framework was proposed for the seismic analysis of underground structures in layered ground under inclined P-SV waves. The free-field responses are first obtained using the stiffness matrix method based on plane-wave assumptions. Then, the domain reduction method was employed to reproduce the wavefield in the numerical model of the soil–structure system. The proposed numerical framework was verified by providing comparisons with analytical solutions for cases involving free-field responses of homogeneous ground, layered ground, and pressure-dependent heterogeneous ground, as well as for an example of a soil–structure interaction simulation. Compared with the viscous and viscous-spring boundary methods adopted in previous studies, the proposed framework exhibits the advantage of incorporating oblique incident waves in a nonlinear heterogeneous ground. Numerical results show that SV-waves are more destructive to underground structures than P-waves, and the responses of underground structures are significantly affected by the incident angles.

关键词： underground structures seismic response stiffness matrix method domain reduction method P-SV waves

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Ribbon bridge in waves based on hydroelasticity theory

Cong WANG, Shixiao FU, Weicheng CUI

《结构与土木工程前沿（英文）》 2009年第3卷第1期页码 57-62 doi: 10.1007/s11709-009-0005-6

摘要： For the design and operation of a floating bridge, the understanding of its hydroelastic behavior in waves is of great importance. This paper investigated the hydroelastic performances of a ribbon bridge under wave action. A brief introduction on the estimation of dynamic responses of the floating bridge and the comparisons between the experiments and estimation were presented. Based on the 3D hydroelasticity theory, the hydroelastic behavior of the ribbon bridge modeled by finite element method (FEM) was analyzed by employing the mode superposition method. And the relevant comparisons between the numerical results and experimental data obtained from one tenth scale elastic model test in the ocean basin were made. It is found that the present method is applicable and adaptable for predicting the hydroelastic response of the floating bridge in waves.

关键词： hydroelasticity ribbon bridge wave finite element method (FEM)

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非均质岩体中一维应力波演化过程分析

钟光复,王志亮,李永池

《中国工程科学》 2006年第8卷第5期页码 58-62

摘要： <p>地下球形药包爆轰后将产生很强的地震波，其传播受到多种因素的影响。p>

关键词：岩石介质一维应力波帽盖模型传播与演化

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Soil seismic analysis for 2D oblique incident waves using exact free-field responses by frequency-based

《结构与土木工程前沿（英文）》 2022年第16卷第12期页码 1530-1551 doi: 10.1007/s11709-022-0900-7

摘要： The seismic analysis of a viscoelastic half-space under two-dimensional (2D) oblique incident waves is carried out by the finite/infinite element method (FIEM). First, the frequency-domain exact solutions for the displacements and stresses of the free field are derived in general form for arbitrary incident P and SV waves. With the present formulation, no distinction needs to be made for SV waves with over-critical incident angles that make the reflected P waves disappear, while no critical angle exists for P waves. Next, the equivalent seismic forces of the earthquake (Taft Earthquake 1952) imposed on the near-field boundary are generated by combining the solutions for unit ground accelerations with the earthquake spectrum. Based on the asymmetric finite/infinite element model, the frequency-domain motion equations for seismic analysis are presented with the key parameters selected. The results obtained in frequency and time domain are verified against those of Wolf’s, Luco and de Barros’ and for inversely computed ground motions. The parametric study indicated that distinct phase difference exists between the horizontal and vertical responses for SV waves with over-critical incident angles, but not for under-critical incident angles. Other observations were also made for the numerical results inside the text.

关键词： oblique incident waves critical angle half-space finite/infinite element approach seismic response analysis

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Propagation characteristics of transient waves in low-strain integrity testing on cast-in-situ concrete

Hanlong LIU, Xuanming DING

《结构与土木工程前沿（英文）》 2009年第3卷第2期页码 240-240 doi: 10.1007/s11709-009-0100-8

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construction integration technology in Brazil’s superlarge deep-water offshore oil and gas unit project (FPSO P67/P70)

《工程管理前沿（英文）》 2022年第9卷第2期页码 349-353 doi: 10.1007/s42524-022-0187-3

关键词： Brazil FPSO P67/P70 superlarge dry towing operation construction integration risk control management

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利用人工源超低频电磁波监测地震的试验与分析

赵国泽,陆建勋

《中国工程科学》 2003年第5卷第10期页码 27-33

摘要： <p>由人工产生大功率超低频（SLF）电磁波可以在地面很大范围的许多测点同时测量该信号，利用它可以研究地下电阻率结构和空间电磁场；研究地震等引起的电磁场异常变化；探测地壳结构和地下资源，具有广阔的应用前景和发展潜力p>

关键词：超低频/极低频电磁波电磁异常电阻率地震监测

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P2P energy trading via public power networks: Practical challenges, emerging solutions, and the way forward

《能源前沿（英文）》 2023年第17卷第2期页码 189-197 doi: 10.1007/s11708-023-0873-9

摘要： Peer-to-peer (P2P) energy trading is an emerging energy supply paradigm where customers with distributed energy resources (DERs) are allowed to directly trade and share electricity with each other. P2P energy trading can facilitate local power and energy balance, thus being a potential way to manage the rapidly increasing number of DERs in net zero transition. It is of great importance to explore P2P energy trading via public power networks, to which most DERs are connected. Despite the extensive research on P2P energy trading, there has been little large-scale commercial deployment in practice across the world. In this paper, the practical challenges of conducting P2P energy trading via public power networks are identified and presented, based on the analysis of a practical Local Virtual Private Networks (LVPNs) case in North Wales, UK. The ongoing efforts and emerging solutions to tackling the challenges are then summarized and critically reviewed. Finally, the way forward for facilitating P2P energy trading via public power networks is proposed.

关键词： distribution network local virtual private network network charges peer-to-peer (P2P) energy trading practical implementation.

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Solomon P Wasser：蕈菌的药用（2019年9月19日）

Solomon P Wasser(高级职称)

2021年01月20日

关键词：农业科学

Experimental verification of the interface wave method to detect interlaminar damage of a metal multilayer structure

Bing LI,Xu GENG,Tong LU,Lei QIANG,Minghang LI

《机械工程前沿（英文）》 2015年第10卷第4期页码 380-391 doi: 10.1007/s11465-015-0365-7

摘要：

The interface wave traveling along the boundary of two materials has been studied for nearly a century. However, experiments, engineering applications, and interface wave applications to the non-destructive inspection of interlaminar composite have developed slowly. In this research, an experiment that applies Stoneley waves (a type of interfacial wave between two solid half-spaces) is implemented to detect the damage in a multilayer structure. The feasibility of this method is also verified. First, the wave velocity and wave structure of Stoneley waves at a perfectly bonded aluminum-steel interface are obtained by solving the Stoneley wave dispersion equation of two elastic half-spaces. Thereafter, an experiment is conducted to measure the Stoneley wave velocity of an aluminum-steel laminated beam and to locate interlaminar cracks by referring to the Stoneley wave velocity and echo wave time. Results indicate that the location error is less than 2%. Therefore, Stoneley waves show great potential as a non-destructive inspection method of a multilayer structure.

关键词： crack localization interface waves Stoneley waves interlaminar damage multilayer structure

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波粒二象性理论的若干问题

黄志洵

《中国工程科学》 2002年第4卷第1期页码 54-63

摘要： <p>论述了光波和物质波的波粒二象性理论的发展，讨论了该理论的存留问题。认为光子的静质量和光子的内部结构仍是科学中的关键性疑点。p>

关键词：光子光波物质波波粒二象性孤子电磁脉冲超光速消失波虚光子

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Numerical simulations of morphological changes in barrier islands induced by storm surges and waves using

Soumendra Nath KUIRY, Yan DING, Sam S Y WANG

《结构与土木工程前沿（英文）》 2014年第8卷第1期页码 57-68 doi: 10.1007/s11709-014-0235-0

摘要： In this paper, an advanced explicit finite volume flow model in two-dimensions is presented for simulating supercritical coastal flows and morphological changes in a tidal/coastal inlet and barrier islands due to storm surges and waves. This flow model is coupled with existing wave-action model and sediment transport model. The resulting integrated coastal process model is capable of simulating flows induced by extreme conditions such as waves, surge tides, river flood flows, etc., and morphological changes induced by rapid coastal currents and waves. This developed supercritical flow model is based on the solution of the conservative form of the nonlinear shallow water equations with the effects of the Coriolis force, uneven bathymetry, wind stress, and wave radiation stresses. The forward Euler scheme is used for the unsteady term; and the convective term is discretized using the Godunov-type shock-capturing scheme along with the HLL Riemann solver on non-uniform rectilinear grids. The accuracy of the developed model is investigated by solving an experimental dam-break test case. Barrier island breaching, overflow and overwash due to severe storm attack are simulated and the predicted morphological changes associated to the events are analyzed to investigate the applicability of the model in a coast where all the physical forces are present.

关键词： coastal inlet coastal process modeling supercritical flow sediment transport barrier islands

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面向服务的P2P网络体系结构层次参考模型研究

刘业,刘林峰,庄艳艳

《中国工程科学》 2007年第9卷第9期页码 72-77

摘要： <p style="text-align: justify;">提出了一种基于交互、面向服务的P2P网络体系结构框架模型ISPNA，同时结合P2P网络松耦合、自组织、可缩放等特点，对P2P网络技术中增强其可用性需从P2P网络体系结构的研究角度出发，将增强P2P网络可用性所需要考虑的多方面因素放置在P2P网络的不同层次予以解决，有利于从宏观上把握需要解决的问题。p>

关键词： P2P网络体系结构层次参考模型资源服务

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Modeling of dynamic response of poroelastic soil layers under wave loading

Mehmet Bar?? Can üLKER

《结构与土木工程前沿（英文）》 2014年第8卷第1期页码 1-18 doi: 10.1007/s11709-014-0233-2

摘要： In this paper, the dynamic response of saturated and layered soils under harmonic waves is modeled using the finite element method. The numerical results are then verified by corresponding analytical solutions which are also developed by the author. The equations governing the dynamics of porous media are written in their fully dynamic form and possible simplifications are introduced based on the presence of inertial terms associated with solid and fluid phases. The response variations are presented in terms of pore water pressure and shear stress distributions within the layers. It is determined that a set of non-dimensional parameters and their respective ratios as a result of layering play a major role in the dynamic response.

关键词： dynamic response of soils coupled flow-deformation finite elements analytical solution harmonic waves

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Probes and nano-delivery systems targeting NAD(P)H:quinone oxidoreductase 1: a mini-review

《化学科学与工程前沿（英文）》 2023年第17卷第2期页码 123-138 doi: 10.1007/s11705-022-2194-7

摘要： The two-electron cytoplasmic reductase NAD(P)H:quinone oxidoreductase 1 is expressed in many tissues. NAD(P)H:quinone oxidoreductase 1 is well-known for being highly expressed in most cancers. Therefore, it could be a target for cancer therapy. Because it is a quinone reductase, many bioimaging probes based on quinone structures target NAD(P)H:quinone oxidoreductase 1 to diagnose tumours. Its expression is higher in tumours than in normal tissues, and using target drugs such as β-lapachone to reduce side effects in normal tissues can help. However, the physicochemical properties of β-lapachone limit its application. The problem can be solved by using nanosystems to deliver β-lapachone. This mini-review summarizes quinone-based fluorescent, near-infrared and two-photon fluorescent probes, as well as nanosystems for delivering the NAD(P)H:quinone oxidoreductase 1-activating drug β-lapachone. This review provides valuable information for the future development of probes and nano-delivery systems that target NAD(P)H:quinone oxidoreductase 1.

关键词： NAD(P)H:quinone oxidoreductase 1 cancer therapy target probe nanosystem