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The Society of Instrument and Control Engineers Annual Conference 2015

作者： Yunfeng Hu Zhigang Chen Jinghua Zhao Hong Chen State Key Laboratory of Automotive Simulation and Control Jilin University Department of Control Science and Engineering Jilin University Computer College Ji Lin Normal University

Urea selective catalytic reduction(urea-SCR) control is very important for diesel engine emissions. In this paper, a Continuous Stirred Tank Reactor(CSTR) is used to represent the SCR model, then a cascade control system is deduced based on active disturbance rejection control(ADRC) strategy. The cascade control system consists of two ADRC controllers, and every ADRC controller contains a Extended State Observer(ESO) to estimate the total disturbance and a PID feedback control law to handle the ammonia coverage ratio tracking. Finally, the simulation results are given to demonstrate the effectiveness of the proposed control scheme tracking the reference and the robustness to the noise.

关键词： urea-SCR control,active disturbance rejection control(ADRC),nonlinear control,ammonia distribution

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The Gyrokinetic Particle simulation of Fusion Plasmas on Tianhe-2 Supercomputer

The Gyrokinetic Particle Simulation of Fusion Plasmas on Tia...

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Workshop on Latest Advances in Scalable Algorithms for Large-Scale Systems (ScalA)

作者： Endong Wang Shaohua Wu Qing Zhang Jun Liu Wenlu Zhang Zhihong Lin Yutong Lu Yunfei Du Xiaoqian Zhu State Key Laboratory of High-end Server & Storage Technology Inspur Jinan China Institute of Physics Chinese Academy of Science Beijing China Fusion Simulation Center Peking University Beijing China Department of Physics and Astronomy University of California Irvine California USA School of Computer Science National University of Defense Technology Changsha China National Supercomputer Center in Guangzhou Sun Yat-sen University Guang Zhou China Academy of Ocean Science and Engineering National University of Defense Technology Changsha China

ISBN: (纸本)9781509052233

We present novel optimizations of the fusion plasmas simulation code, GTC on Tianhe-2 supercomputer. The simulation exhibits excellent weak scalability up to 3072 31S1P Xeon Phi co-processors. An unprecedented up to 5.8× performance improvement is achieved for the GTC on Tianhe-2. An efficient particle exchanging algorithm is developed that simplifies the original iterative scheme to a direct implementation, which leads to a 7.9× performance improvement in terms of MPI communications on 1024 nodes of Tianhe-2. A customized particle sorting algorithm is presented that delivers a 2.0× performance improvement on the co-processor for the kernel relating to the particle computing. A smart offload algorithm that minimizes the data exchange between host and co-processor is introduced. Other optimizations like the loop fusion and vectorization are also presented.

关键词： Kernel Supercomputers Physics Computational modeling Scalability Optimization Plasmas

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Hybrid phase-locked loop with fast locking time and low spur in a 0.18-μm CMOS process

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Chinese Physics B 2014年第7期23卷 748-753页

作者：朱思衡司黎明郭超史君宇朱卫仁 Beijing Key Laboratory of Millimeter Wave and Terahertz Technology Department of Electronic Engineering School of Information and ElectronicsBeijing Institute of Technology Advanced Computing and Simulation Laboratory (AχL) Department of Electrical and Computer Systems EngineeringMonash University

We propose a novel hybrid phase-locked loop （PLL） architecture for overcoming the trade-off between fast locking time and low spur. To reduce the settling time and meanwhile suppress the reference spurs, we employ a wide-band single-path PLL and a narrow-band dual-path PLL in a transient state and a steady state, respectively, by changing the loop bandwidth according to the gain of voltage controlled oscillator （VCO） and the resister of the loop filter. The hybrid PLL is implemented in a 0.18-μm complementary metal oxide semiconductor （CMOS） process with a total die area of 1.4×0.46 mm2. The measured results exhibit a reference spur level of lower than -73 dB with a reference frequency of 10 MHz and a settling time of 20 μs with 40 MHz frequency jump at 2 GHz. The total power consumption of the hybrid PLL is less than 27 mW with a supply voltage of 1.8 V.

关键词： phase-locked loop （PLL） fast locking time low spur complementary metal oxide semiconductor（CMOS）

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Design and Application of Plasmonic Nanoparticle Superlattices

Design and Application of Plasmonic Nanoparticle Superlattic...

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The 6th International Conference on Nanoscience & Technology, China 2015

作者： Kae Jye Si Yi Chen Debabrata Sikdar Wenlong Cheng Department of Chemical Engineering Faculty of EngineeringMonash University State Key Laboratory of Bioelectronics Jiangsu Key Laboratory for Biomaterials and DevicesSchool of Biological Science and Medical EngineeringSoutheast University Advanced Computing and Simulation Laboratory (AχL) Department of Electrical and Computer Systems EngineeringFaculty of EngineeringMonash University

The modular assembly of plasmonic nanoparticles enables the creation of a new class of two-dimensional nanoparticle sheets with novel optical signatures. Despite exciting advances, undeveloped issues still remain in terms of nanoparticle sheet design and potential applications. Here, we present our research work which describes a simplistic and general polymer-based approach to assemble core-shell Au@Ag nanocubes into periodic nanoparticle arrays.[1] These nanocubes are functionalized with polystyrene and spread on the surface of water droplet on a holey copper mesh. Upon water evaporation, the balance between the nanoparticle core-to-core attraction and polystyrene ligand-to-ligand repulsion forces led to the formation of a free-standing lattice-like nanosheet with ultimate thickness limit but macroscopic lateral dimensions. These sheets, which we termed as plasmene, exhibited unique novel properties such as localized gap and propagating plasmonics. Using focused ion beam(FIB) lithography, the superior robustness of these nanosheets allows it to be milled into one-dimensional nanoribbons and folded into geometrically well-defined three-dimensional origami structures such as cubes, hearts and even a ‘flying bird‘. Due to the structural homogeneity, mechanical flexibility and optical transparency of these sheets, we also demonstrated the application of these nanosheets as a surface-enhanced Raman scattering(SERS) substrate for chemical detection on topologically complex surfaces such as banknotes and coins.[2,3]

关键词： Plasmene,Nanoparticle,Superlattices,Plasmonics,Origami,SERS,Self-Assembly and supramolecules

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Influence of Blank Holding Force on Stretch Flange Forming of Aluminum Alloy

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Materials Today: Proceedings 2015年第4期2卷 1934-1941页

作者： Yogesh Dewang M.S. Hora S.K. Panthi Research Scholar Department of Mechanical EngineeringMaulana Azad National Institute of Technology Bhopal 462051 India Professor Department of Civil EngineeringMaulana Azad National Institute of Technology Bhopal 462051 India Scientist Computer Simulation & Design CentreAdvanced Materials Processes and Research Institute Bhopal 462064 India

The effect of blank holding force on the stretch flanging process was investigated using finite element simulation and experimental analysis. Finite element model was used to study the effect of blank holding forces on punch load and forming kinematics. An aluminum alloy 5052 sheet of 0.5 mm thickness was employed for this work. Blank holding force has a great effect on punch load and significant influence on forming kinematics. Validation of FEM results were obtained by conducting experiments. A very good agreement was obtained between FEM simulation results in terms of punch load and final shape which shows the accuracy of present finite element model.

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Measurement of Biomechanical Interactions at the Stump-Socket Interface in Lower Limb Prostheses

Measurement of Biomechanical Interactions at the Stump-Socke...

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Annual International Conference of the IEEE engineering in Medicine and Biology Society

作者： V. Noll J. Wojtusch J. Schuy M. Grimmer P. Beckerle S. Rinderknecht the Institute for Mechatronic Systems in Mechanical Engineering Department of Mechnical Engineering TU Darmstadt Germany the Simulation Systems Optimization and Robotics Group Department of Computer Science TU Darmstadt Germany the Locomotion Laboratory Institute of Sport Science TU Darmstadt Germany

ISBN: (纸本)9781424492695

This paper introduces a novel measuring approach for detecting relative movement between stump and socket in lower limb prostheses. The application of the motion capturing based measuring approach is shown at a single male trans-tibial amputee using a Patella Tendon Bearing (PTB) socket. It further investigates and assesses the feasibility of measuring the relative movement between stump and socket during level walking at different velocities and allocating it to the coinciding loads. Representative results for the two translational degrees of freedom in the sagittal plane are presented and discussed. For the proximodistal (pd) direction, a linear correlation between applied load and relative movement is found, while for the anteroposterior (ap) direction the stump movement is largely influenced by the motion sequence during the respective gait event. Additionally, the effect of walking speed is discussed.

关键词： Biomechanical Interactions Stump-Socket Interface Lower Limb Prostheses

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Design and Application of Plasmonic Nanoparticle Superlattices

Design and Application of Plasmonic Nanoparticle Superlattic...

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The 6th International Conference on Nanoscience and Technology, China 2015 (第六届中国国际纳米科学技术会议)

作者： Kae Jye Si Yi Chen Debabrata Sikdar Wenlong Cheng Department of Chemical Engineering Faculty of EngineeringMonash UniversityClayton 3800VictoriaAu State Key Laboratory of Bioelectronics Jiangsu Key Laboratory for Biomaterials and DevicesSchool of Advanced Computing and Simulation Laboratory(AχL) Department of Electrical and Computer Systems Engi

The modular assembly of plasmonic nanoparticles enables the creation of a new class of two-dimensional nanoparticle sheets with novel optical *** exciting advances,undeveloped issues still remain in terms of nanoparticle sheet design and potential ***,we present our research work which describes a simplistic and general polymer-based approach to assemble core-shell Au@Ag nanocubes into periodic nanoparticle arrays.

关键词： Plasmene Nanoparticle Superlattices Plasmonics Origami SERS Self-Assembly and supramolecules

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Reliable Microwave Modeling by Means of Variable-Fidelity Response Features

Reliable Microwave Modeling by Means of Variable-Fidelity Re...

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作者： Koziel, Slawomir Bandler, John W. School of Science and Engineering Reykjavík University Reykjavík101 Iceland Faculty of Electronics Telecommunications and Informatics Gdañsk University of Technology Gdañsk80-233 Poland Simulation Optimization Systems Research Laboratory Department of Electrical and Computer Engineering McMaster University HamiltonONL8S4K1 Canada Bandler Corporation DundasONL9H5E7 Canada

In this work, methodologies for low-cost and reliable microwave modeling are presented using variable-fidelity response features. The two key components of our approach are: 1) a realization of the modeling process at the level of suitably selected feature points of the responses (e.g., S-parameters versus frequency) of the structure at hand and 2) the exploitation of variable-fidelity EM simulation data, also for the response feature representation. Due to the less nonlinear dependence between the coordinates of the feature points on the geometrical parameters of the structure of interest, the amount of training data can be greatly reduced. Additional cost reduction is obtained by means of generating the majority of the training data at a coarse-discretization EM simulation level and exploiting the correlations between the EM models of various fidelities. We propose two ways of combining the low-and high-fidelity data sets: 1) an external approach, through space mapping (simpler to implement) and 2) an internal approach, using co-kriging (more flexible and potentially offering better accuracy). The operation and performance of our modeling techniques are demonstrated by three microstrip filter examples and a compact rat-race coupler. A comprehensive verification and comparisons with several benchmark techniques, as well as application examples (filter optimization) are also provided. © 2015 IEEE.

关键词： Kriging

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Urea-SCR Process Control for Diesel Engine Using Feedforward-Feedback Nonlinear Method

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IFAC-PapersOnLine 2015年第8期48卷 367-372页

作者： Jinghua Zhao Zhigang Chen Yunfeng Hu Hong Chen State Key Laboratory of Automotive Simulation and Control Jilin University Changchun Jilin 130025 China Department of Control Science and Engineering Jilin University Changchun Jilin 130025 China Computer College JiLin Normal University Siping Jilin 136000 China

Urea selective catalytic reduction (urea-SCR) process control is very important for exhaust gas aftertreatment in diesel engines. A control system tracking ammonia coverage ratio is designed to achieve high NO x conversion efficiency and low ammonia slip for urea-SCR process in this paper. The control system consists of a nonlinear feedforward controller based on flatness and a PI feedback controller to deal with the uncertainties and disturbance. Furthermore, a tuning method of controller parameters is presented based on randomized algorithms. Finally, the simulation results are given to demonstrate the effectiveness of the proposed control scheme.

关键词： urea-SCR ammonia distribution nonlinear control flatness feedforward feedback

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Erratum to: A novel revenue optimization model to address the operation and maintenance cost of a data center

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Journal of Cloud Computing 2016年第1期5卷 1-1页

作者： Snehanshu Saha Jyotirmoy Sarkar Avantika Dwivedi Nandita Dwivedi Anand M. Narasimhamurthy Ranjan Roy Shrisha Rao Center for Applied Mathematical Modeling and Simulation (CAMMS) & Department of Computer Science and Engineering PESIT-BSC Bangalore India GE Healthcare Bangalore India BITS Pilani Hyderabad India State Resource Centre Chattisgarh India IIIT Bangalore Bangalore India

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