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Geotechnical particle finite element method for modeling of soilstructure interaction under large deformation conditions

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Journal of Rock mechanics and Geotechnical Engineering 2022年第3期14卷 967-983页

作者： josep maria Carbonell Lluís monforte matteo O.Ciantia marcos Arroyo Antonio Gens mECAmAT Group Department of EngineeringFaculty of Science and TechnologyUniversitat de Vic-Universitat Central de Catalunya(UVic-UCC)VicSpain Centre Internacional de mètodes Numèrics a l'Enginyeria(CImNE) BarcelonaSpain School of Science and Engineering University of DundeeDundeeUK Universitat Politècnica de Cataluna-BarcelonaTech BarcelonaSpain

The possibilities of the particle finite element method(PFEm)for modeling geotechnical problems are increasingly *** is a numerical approach to solve large displacement and large strain continuum problems that are beyond the capabilities of classical finite element method(FEm).In PFEm,the computational domain is reconfigured for optimal solution by frequent remeshing and boundary *** inherits many concepts,such as a Lagrangian description of continuum,from classic geomechanical *** familiarity with more popular numerical methods facilitates learning and *** work focuses on G-PFEm,a code specifically developed for the use of PFEm in geotechnical *** article has two *** first is to give the reader an overview of the capabilities and main features of the current version of the G-PFEm and the second is to illustrate some of the newer developments of the code.G-PFEm can solve coupled hydro-mechanical static and dynamic problems involving the interaction of solid and/or deformable *** constitutive models for geomaterials are available,including features,such as structure and destructuration,which result in brittle *** solutions are robust,solidly underpinned by numerical technology including mixedfield formulations,robust and mesh-independent integration of elastoplastic constitutive models and a rigorous and flexible treatment of contact *** novel features presented in this work include the contact domain technique,a natural way to capture contact interactions and impose contact constraints between different continuum bodies,as well as a new simplified formulation for dynamic impact *** code performance is showcased by the simulation of several soil-structure interaction problems selected to highlight the novel code features:a rigid footing insertion in soft rock,pipeline insertion and subsequent lateral displacement on over-consolidated clay,screw-pile pull-out and the dyn

关键词： Particle finite element method(PFEm) Structured soils Nonlocal elastoplasticity Contact domain method Soil penetration problems

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Abc-frame complex-coefficient filter and controller based current harmonic elimination strategy for three-phase grid connected inverter

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Journal of modern Power Systems and Clean Energy 2016年第1期4卷 87-93页

作者： Xiaoqiang GUO josep m.GUERRERO Department of Electrical Engineering Yanshan UniversityQinhuangdao 066004China Department of Energy Technology Aalborg University9220 AalborgDenmark

Current quality is one of the most important issues for operating three-phase grid-connected inverter in distributed generation systems. In practice, the grid current quality is degraded in case of non-ideal utility voltage. A new control strategy is proposed for the three-phase gridconnected inverter. Different from the traditional method,our proposal utilizes the unique abc-frame complex-coefficient filter and controller to achieve the balanced, sinusoidal grid current. The main feature of the proposed method is simple and easy to implement without any frame transformation. The theoretical analysis and experimental test are presented. The experimental results verify the effectiveness of the proposed control strategy.

关键词： Grid-connected inverter Current control Complex-coefficient filter Complex-coefficient controller

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Hyperglycemia and reduced adiposity of streptozotocin-induced diabetic mice are not alleviated by oral benzylamine supplementation

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World Journal of Diabetes 2022年第9期13卷 752-764页

作者： Christian Carpéné Kristiyan Stiliyanov Atanasov Francisco Les josep mercader Barcelo Institut des maladies métaboliques et Cardiovasculaires INSERM UMR 1297Toulouse 31432France molecular Biology and One Health research group Department of Fundamental Biology and Health SciencesUniversity of the Balearic IslandsPalma 07122Spain Department of Pharmacy Faculty of Health SciencesUniversidad San JorgeVillanueva de GállegoZaragoza 50830Spain

BACKGROUND Benzylamine(Bza)oral administration delays the onset of hyperglycemia in insulin-resistant db-/-mice;a genetic model of obesity and type 2 *** To extend the antihyperglycemic properties of oral benzylamine to a model of insulin-deficient type 1 *** male Swiss mice were rendered diabetic by streptozotocin treatment(STZ)and divided in two groups:one received 0.5%Bza as drinking solution for 24 d(STZ Bza-drinking)while the other was drinking water ad *** groups were constituted in age-matched,nondiabetic *** intake,liquid intake,body weight gain and nonfasting blood glucose levels were followed during *** the end of treatment,fasted glycemia,liver and white adipose tissue(WAT)mass were measured,while glucose uptake assays were performed in *** STZ diabetic mice presented typical features of insulin-deficient diabetes:reduced body mass and increased blood glucose *** altered parameters were not normalized in the Bza-drinking group in spite of restored food and water *** consumption could not reverse the severe fat depot atrophy of STZ diabetic *** the nondiabetic mice,no difference was found between control and Bza-drinking mice for any *** isolated adipocytes,hexose uptake was partially activated by 0.1 mmol/L Bza in a manner that was obliterated in vitro by the amine oxidase inhibitor phenelzine and that remained unchanged after Bza *** of 0.1 mmol/L Bza in WAT was lower in STZ diabetic than in normoglycemic *** Bza supplementation could not normalize the altered glucose handling of STZ diabetic mice with severe WAT ***,its antidiabetic potential in obese and diabetic rodents does not apply to lipoatrophic type 1 diabetic mice.

关键词： Diabetes Adipocytes Amine oxidases Insulin-like agents Glucose transport Polydipsia

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低电压应力单级升降压逆变器及控制策略

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中国电机工程学报 2023年第8期43卷 3117-3126页

作者：郭小强张浩陈兆文王宝诚华长春 josep m.GUERRERO 燕山大学电气工程学院河北省秦皇岛市066004 奥尔堡大学能源技术系丹麦奥尔堡9220

针对传统基于Buck-Boost非隔离逆变器具有电压应力大的缺点,提出一种具有低电压应力的新型无变压器单级升降压电压源逆变器拓扑及其调制方案。该拓扑可以在较宽的输入电压范围内实现逆变,同时具有低电压应力与电感电流纹波。文中首先分... 详细信息

针对传统基于Buck-Boost非隔离逆变器具有电压应力大的缺点,提出一种具有低电压应力的新型无变压器单级升降压电压源逆变器拓扑及其调制方案。该拓扑可以在较宽的输入电压范围内实现逆变,同时具有低电压应力与电感电流纹波。文中首先分析该逆变器的拓扑特性及工作模态,设计可以保证输出电容电压平衡的逆变器的调制策略,建立共模等效电路,对高频漏电流进行分析。最后,搭建硬件实验平台,在DSP TmS320F28335和FPGA XC6SLX9-2TQG 144C数字化平台上对提出的方案进行实验验证,实验结果验证了所提新型拓扑和控制方法的有效性。

关键词：多电平逆变器电压应力升降压逆变器调制共模电压

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A Secure Elliptic Curve-Based RFID Protocol

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Journal of Computer Science & Technology 2009年第2期24卷 309-318页

作者： Santi martínez magda Valls Concepció Roig josep m. miret Francesc Giné Computer Science Department Universitat de Lleida mathematics Department Universitat de Lleida

Nowadays, the use of Radio Frequency Identification （RFID） systems in industry and stores has increased Nevertheless, some of these systems present privacy problems that may discourage potential users. Hence, high confidence and efficient privacy protocols are urgently needed. Previous studies in the literature proposed schemes that are proven to be secure, but they have scalability problems. A feasible and scalable protocol to guarantee privacy is presented in this paper. The proposed protocol uses elliptic curve cryptography combined with a zero knowledge-based authentication scheme. An analysis to prove the system secure, and even forward secure is also provided.

关键词： elliptic curve cryptography forward security RFID zero knowledge

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Can Biochar Protect Labile Organic matter Against mineralization in Soil?

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土壤圈：英文版 2017年第5期27卷 822-831页

作者： giovanna b.melas oriol ortiz josep m.alacaiz departament de biologia animal de biologia vegetal i d’ecologiafacultat de biociènciesuniversitat autònoma de barcelonaCerdanyola del Valles 08193(Spain) centre de recerca ecologica i aplicacions forestals(creaf) Cerdanyola del Valles E08193(Spain) dipartimento di agraria universitádegli studi di sassariViale Italia 39Sassari 071O0(halla) departamento de ciencias agrarias y del medio natural escuela politécnica superior de huescauniversidad de zaragozaHuesca E22071(Spain)

Biochar could help to stabilize soil organic(SOm) matter, thus sequestering carbon(C) into the soil. The aim of this work was to determine an easy method i) to estimate the effects of the addition of biochar and nutrients on the organic matter(SOm)mineralization in an artificial soil, proposed by the Organization for Economic Co-operation and Development(OECD), amended with glucose and ii) to measure the amount of labile organic matter(glucose) that can be sorbed and thus be partially protected in the same soil, amended or not amended with biochar. A factorial experiment was designed to check the effects of three single factors(biochar, nutrients, and glucose) and their interactions on whole SOm mineralization. Soil samples were inoculated with a microbial inoculum and preincubated to ensure that their biological activities were not limited by a small amount of microbial biomass, and then they were incubated in the dark at 21℃ for 619 d. Periodical measurements of C mineralized to carbon dioxide(CO_2) were carried out throughout the 619-d incubation to allow the mineralization of both active and slow organic matter pools. The amount of sorbed glucose was calculated as the difference between the total and remaining amounts of glucose added in a soil extract. Two different models, the Freundlich and Langmuir models, were selected to assess the equilibrium isotherms of glucose sorption. The CO_2-C release strongly depended on the presence of nutrients only when no biochar was added to the soil. The mineralization of organic matter in the soil amended with both biochar and glucose was equal to the sum of the mineralization of the two C sources separately. Furthermore, a significant amount of glucose can be sorbed on the biochar-amended soil, suggesting the involvement of physico-chemical mechanisms in labile organic matter protection.

关键词：土壤活性有机质矿化作用生物炭保护经济合作与发展组织营养物质物理化学机制二氧化碳

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Analysis and Control of modular multi-terminal DC Power Flow Controller with Fault Current Limiting Function

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Journal of modern Power Systems and Clean Energy 2021年第6期9卷 1375-1385页

作者： Qianming Xu Xinyu Huang Xu Chu mingshen Li Zhikang Shuai Chunming Tu josep m.Guerrero College of Electrical and Information Engineering Hunan University Department of Energy Technology Aalborg University

In order to overcome the problems of power flow control and fault current limiting in multi-terminal high voltage direct current(mTDC)grids,this paper proposes a modular multi-terminal DC power flow controller(mm-DCPFC)with fault current limiting *** topology structure,operation principle,and equivalent circuit of mm-DCPFC are introduced,and such a structure has the advantages of modularity and *** power balance mechanism is studied and a hierarchical power balance control strategy is *** results show that mm-DCPFC can achieve internal power exchange,which avoids the use of external power *** fault characteristics of mm-DCPFC are analyzed,fault current limiting and self-protection methods are proposed,and the factors affecting the current limiting capability are *** simulation models are established in PLECS,and the simulation results verify the effectiveness of mm-DCPFC in power flow control,fault current limiting,and *** addition,a prototype is developed to validate the function and control method of mm-DCPFC.

关键词： Fault current limiting multi-terminal high volt-age direct current(mTDC)grid power balance DC power flow controller

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Energy management Strategy Considering multi-time-scale Operational modes of Batteries for the Grid-connected microgrids Community

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CSEE Journal of Power and Energy Systems 2020年第1期6卷 111-121页

作者： Xiaowen Xing Lili Xie Hongmin meng Xin Guo Lei Yue josep m.Guerrero Department of Electrical Engineering Northwestern Polytechnical UniversityXi’an 710072China State Grid Information and Telecommunication Group Ltd.Co. Beijing 102211China State Grid Beijing Fengtai Electric Power Supply Company Beijing 100073China China Electric Power Research Institute Beijing 100192China Department of Energy Technology Aalborg UniversityAalborg9220Denmark

The advantages and promoting applications of the microgrids community(mGC)allows for a critical step being taken toward a smart *** energy management strategy(EmS)is essential to intelligently coordinate the operations of the *** paper presents a multi-time-scale EmS consid-ering battery operational modes for grid-connected *** proposed strategy consists of two modules:day-ahead integrated optimization and realtime distributed *** first module aims to minimize the operational cost of the mGC considering battery free-overcharging *** problem is solved by the mixed integer linear programming(mILP)sim-ulating two charging/discharging modes:limited-current mode and constant-voltage *** second module is installed in local mGs to correct the optimizing deviations of the day-ahead static scheduling,which are caused by predicting errors of renewable energy and *** main contribution of this work is integrating the advantages of global optimization of the centralized method and the fast computing speed of the distributed *** results prove the proposed EmS is feasible and *** computing time at each updating step is reduced by 75%on average,which has the potential to be adopted in engineering.

关键词： Day-ahead optimization energy management strategy forecast errors microgrids community realtime compensation strategy

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Analysis,design,and experimental evaluation of power calculation in digital droop-controlled parallel microgrid inverters

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Journal of Zhejiang University-Science C(Computers and Electronics) 2013年第1期14卷 50-64页

作者： ming-zhi GAO min CHEN Cheng JIN josep m.GUERRERO Zhao-ming QIAN Department of Applied Electronics Zhejiang University Institute of Energy Technology Aalborg University

Parallel operation of distributed generation is an important topic for microgrids,which can provide a highly reliable electric supply service and good power quality to end customers when the utility is ***,there is a well-known limitation:the power sharing accuracy between distributed generators in a parallel *** and voltage droop is a well-established control method for improving power sharing *** this method,the active and reactive power calculations are used to adjust the frequency and amplitude of the output *** paper describes the digital implementation of a droop method,and analyzes the influence of power calculation on droop method *** to the analysis,the performance of droop control in a digital control system is limited by the accuracy and speed of the power calculation *** propose an improved power calculation method based on p-q theory to improve the performance of the droop control method,and we compare our new method with two traditional power calculation ***,simulation results and experimental results from a three single-phase 1-kW-inverter system are presented,which validate the performance of our proposed method.

关键词：英文摘要编辑工作优秀论文医学期刊

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On a Shallow Water model for the Simulation of Turbidity Currents

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Communications in Computational Physics 2009年第9期6卷 848-882页

作者： T.morales de Luna m.J.Castro Dıaz C.pares madronal E.D.Fernandez Nieto Analisis matematico Facultad de Ciencias–Univ.MalagaCampus de Teatinoss/n29071-MalagaSpain Dpto.matematica Aplicada I ETS Arquitectura–Univ.SevillaAvda.Reina Mercedes N.241012-SevillaSpain

We present a model for hyperpycnal plumes or turbidity currents that takes into account the interaction between the turbidity current and the bottom,considering deposition and erosion effects as well as solid transport of particles at the bed load due to the *** entrainment from the ambient water in which the turbidity current plunges is also *** of ambient water is neglected and the rigid lid assumption is *** model is obtained as a depth-average system of equations under the shallow water hypothesis describing the balance of fluid mass,sediment mass and mean *** character of the system is analyzed and numerical simulations are carried out using finite volume schemes and path-conservative Roe schemes.

关键词： Turbidity currents hyperbolic systems finite volume methods path-conservative schemes numerical modeling

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