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冷喷涂单颗粒铜在铝基体上的显微结构研究

稀有金属材料与工程 2018年第4期47卷 1166-1173页

作者：马广璐孔令艳李铁藩 Nuria Cinca josep m.guilemany 熊天英中国科学院金属研究所辽宁沈阳110016 巴塞罗那大学热喷涂中心(CPT)

采用冷喷涂法在铝(Al)基体上沉积单颗粒铜(Cu),利用聚焦离子束/电子束(FIB/SEm)系统精确定位并原位制备了完整单个颗粒Cu沉积在Al基体上的透射样品,分析其显微结构及形成原因。实验结果表明,撞击过程中温度与应力分布不均匀,导致沉积Cu... 详细信息

采用冷喷涂法在铝(Al)基体上沉积单颗粒铜(Cu),利用聚焦离子束/电子束(FIB/SEm)系统精确定位并原位制备了完整单个颗粒Cu沉积在Al基体上的透射样品,分析其显微结构及形成原因。实验结果表明,撞击过程中温度与应力分布不均匀,导致沉积Cu颗粒不均匀形变。Cu/Al界面受影响较大:颗粒动能转化为形变能和热能,打破了界面处氧化膜,使界面附近温度迅速升高,发生动态再结晶,生成金属间化合物Cu_9Al_4;Cu颗粒内距界面越远的区域,受温度和应力的影响越小,其变形主要是通过晶体内位错增殖和移动;沉积颗粒顶部,远离Cu/Al界面,几乎不受应力和温度影响,保持原始显微结构。

关键词：聚焦离子束透射 Cu-Al 冷喷涂颗粒形变

Brain-derived neurotrophic factor signaling in the neuromuscular junction during developmental axonal competition and synapse elimination

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Neural Regeneration Research 2025年第2期20卷 394-401页

作者： josep Tomàs Víctor Cilleros-mañé Laia Just-Borràs marta Balanyà-Segura Aleksandra Polishchuk Laura Nadal marta Tomàs Carolina Silvera-Simón manel m.Santafé maria A.Lanuza Unitat d’Histologia i Neurobiologia(UHNeurob) Facultat de Medicina i Ciències de la SalutUniversitat Rovira i VirgiliReusSpain

During the development of the nervous system,there is an overproduction of neurons and *** competition between neighboring nerve endings and synapses performing different activity levels leads to their elimination or *** have extensively studied the involvement of the brain-derived neurotrophic factor-Tropomyosin-related kinase B receptor neurotrophic retrograde pathway,at the neuromuscular junction,in the axonal development and synapse elimination process versus the synapse *** purpose of this review is to describe the neurotrophic influence on developmental synapse elimination,in relation to other molecular pathways that we and others have found to regulate this *** particular,we summarize our published results based on transmitter release analysis and axonal counts to show the different involvement of the presynaptic acetylcholine muscarinic autoreceptors,coupled to downstream serine-threonine protein kinases A and C(PKA and PKC)and voltage-gated calcium channels,at different nerve endings in developmental *** dynamic changes that occur simultaneously in several nerve terminals and synapses converge across a postsynaptic site,influence each other,and require careful studies to individualize the mechanisms of specific *** describe an activity-dependent balance(related to the extent of transmitter release)between the presynaptic muscarinic subtypes and the neurotrophin-mediated TrkB/p75NTR pathways that can influence the timing and fate of the competitive interactions between the different axon *** downstream displacement of the PKA/PKC activity ratio to lower values,both in competing nerve terminals and at postsynaptic sites,plays a relevant role in controlling the elimination of supernumerary ***,calcium entry through L-and P/Q-subtypes of voltage-gated calcium channels(both channels are present,together with the N-type channel in developing nerve terminals)contributes to red

关键词： acetylcholine release adenosine receptors axonal competition brain-derived neurotrophic factor calcium channels motor end-plate muscarinic acetylcholine receptors postnatal synapse elimination serine kinases tropomyosin-related kinase receptorB

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

Square cavity flow driven by two mutually facing sliding walls

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2023年第7期24卷 612-624页

作者： Bo AN josep m.BERGADà Weimin SANG Dong LI F.mELLIBOVSKY School of Aeronautics Northwestern Polytechnical UniversityXi'an 710072China National Key Laboratory of Science and Technology on Aerodynamic Design and Research Xi'an 710072China Key Laboratory of Icing and Anti/De-icing China Aerodynamics Research and Development CenterMianyang 621000China Department of Fluid mechanics Universitat Politécnica de CatalunyaBarcelona 08034Spain Department of Physics Aerospace Engineering DivisionUniversitat Politécnica de CatalunyaBarcelona 08034Spain

We investigate the flow inside a 2D square cavity driven by the motion of two mutually facing walls independently sliding at different *** exploration,which employs the lattice Boltzmann method(LBm),extends on previous studies that had the two lids moving with the exact same speed in opposite *** there,here the flow is governed by two Reynolds numbers(Re_(T),Re_(B))associated to the velocities of the two moving *** convenience,we define a bulk Reynolds number Re and quantify the driving velocity asymmetry by a parameterα.Parameterαhas been defined in the rangeα∈[-π4,0]and a systematic sweep in Reynolds numbers has been undertaken to unfold the transitional dynamics path of the two-sided wall-driven cavity *** particular,the critical Reynolds numbers for Hopf and NeimarkSacker bifurcations have been determined as a function ofα.The eventual advent of chaotic dynamics and the symmetry properties of the intervening solutions are also analyzed and *** study unfolds for the first time the full bifurcation scenario as a function of the two Reynolds numbers,and reveals the different flow topologies found along the transitional path.

关键词： Two-sided wall-driven cavity Velocity ratios Transitions Flow topology Energy cascade

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

Can Biochar Protect Labile Organic matter Against mineralization in Soil?

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Pedosphere 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 ~C for 619 d. Periodical measurements of C mineralized to carbon dioxide （CO2） 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 CO2-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： C source glucose sorption microbial biomass nutrients soil respiration

Dynamic Equivalent modeling for Black-box microgrids Under multi-operating-point by Using LSTm

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CSEE Journal of Power and Energy Systems 2024年第2期10卷 639-648页

作者： Yunlu Li josep m.Guerrero Junyou Yang Yajuan Guan Guiqing ma Jiawei Feng School of Electrical Engineering Shenyang University of TechnologyShenyang 110819China Department of Energy Technology Center for Research on Microgrids(CROM)Aalborg University9220 Aalborg EastDenmark

Since the high penetration of distributed energy sources complicates the dynamics of electrical power systems,accurate dynamic models are indispensable for study on the transient behavior of the microgrid(mG).In some practices,the lack of full detailed information results in failure of dif-ferential equation based dynamic modeling,which leads to a demand for a black-box mG modeling *** is a critical challenge to maintain the effectiveness of the black-box model under a wide operating range and various fault *** this paper,inspired by the mathematical equivalence between the recurrent neural network(RNN)and differential-algebraic equations(DAEs),a dynamic equivalent modeling method,using long short-term memory(LSTm),is presented to tackle this *** first,the modeling equivalence and advantages of our basic idea are ***,modeling procedures,including data preparation and design guidelines,are ***,the proposed method is applied to a multi-microgrid testing system for performance *** results,under various scenarios,reveal that the proposed modeling method has an adequate capability for representing the dynamic behaviors of a black-box mG under grid fault and operating point changing *** Terms-Deep learning,dynamic behavior,dynamic equivalent model,microgrid,neural network.

关键词： Deep learning dynamic behavior dynamic equivalent model microgrid neural network

Inertial PLL of Grid-connected Converter for Fast Frequency Support

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CSEE Journal of Power and Energy Systems 2023年第4期9卷 1594-1599页

作者： Xiang Guo Donghai Zhu Jiabing Hu Xudong Zou Yong Kang josep m.Guerrero State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China. Department of Energy Technology Aalborg UniversityAalborg 9220Denmark

Frequency support capability for the grid-connected converter(GCC)is one of the basic safeguards for the stability of renewables-dominated power *** this paper,analogous to the motion equation of a synchronous generator(SG),an inertial phase-locked loop(iPLL)is proposed for GCC to achieve fast frequency *** iPLL introduces the inertial and damping loops into the classic PLL structure to emulate the natural frequency regulation characteristics of a *** with the existing methods,the iPLL has a faster frequency response and is simpler in design and ***,the proposed iPLL method is validated by *** Terms-Frequency support,grid-connected converter,inertial phase-locked loop(iPLL),synchronous generation(SG).

关键词： Frequency support grid-connected converter inertial phase-locked loop(iPLL) synchronous generation(SG).

Robust Switch Selection in Radial Distribution Systems Using Combinatorial Optimization

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CSEE Journal of Power and Energy Systems 2022年第3期8卷 933-940页

作者： Hani mavalizadeh Omid Homaee Reza Dashti josep m.Guerrero Hassan Haes Alhelou Pierluigi Siano Fanavaran moj Khatam Tehran 16844Iran School of Electrical Engineering Iran University of Science and TechnologyTehran 16844Iran School of Advanced Technologies Iran University of Science and TechnologyTehran 16844Iran Department of Energy Technology Aalborg UniversityAalborg 9220Denmark Department of Electrical Power Engineering Faculty of Mechanical and Electrical EngineeringTishreen UniversityLattakia 2230Syria Department of management&Innovation Systems University of SalernoFisciano 84084Italy

Selecting the best type of equipment among available switches with different prices and reliability levels is a significant challenge in distribution system *** this paper,the optimal type of switches in a radial distribution system is selected by considering the total cost and reliability criterion and using the weighted augmented epsilon constraint method and combinatorial optimization.A new index is calculated to assess the robustness of each Pareto ***,for each failure,repair time is considered based on historical *** Carlo simulations are used to consider the switch failure uncertainty and fault repair time uncertainty in the *** proposed framework is applied to an RTBS Bus-2 test ***,the model is also applied to an industrial system to verify the proposed method’s excellent performance in larger practical engineering problems.

关键词： Combinatorial optimization monte Carlo Simulation multi-objective optimization radial distribution system reliability robustness