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Comparison of morphological properties of different types of coarse aggregates

Comparison of morphological properties of different types of...

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2013 Airfield and Highway Pavement Conference: Sustainable and Efficient Pavements

作者： Singh, Dharamveer Zaman, Musharraf Commuri, Sesh Bombay Powai Mumbai 400076 India Research and Graduate Program College of Engineering University of Oklahoma 202 W. Boyd St. Norman OK 73019 United States School of Electrical and Computer Engineering University of Oklahoma Norman OK 73019 United States

ISBN: (纸本)9780784413005

The present study was undertaken to compare angularity, texture, and flat and elongated (F&E) particles of three different types (namely, granite, rhyolite, and limestone) of coarse aggregates. An aggregate-imaging system (AIMS) manufactured by Pine Instruments Inc., was used to measure the shape parameters of the aggregates. Comparison of shape parameters was performed by plotting the distribution of different types of angular particles (i.e., rounded, sub-rounded, sub-angular, and angular);texture particles (i.e., polished, smooth, low, medium, and high roughness);and F&E particles (maximum to minimum dimension ratio = 5:1 and 3:1). In addition, analysis of variance (ANOVA) was conducted to compare the mean of the shape parameters. Results show that no significant difference exists in angularity of different types of aggregates. However, texture was found to be significantly different for the three types of aggregates considered in this study. It was observed that the granite aggregates have the highest texture followed by the limestone and the rhyolite aggregates. The study indicates that aggregates can have same angularity but can differ significantly in texture. The distribution of F&E particles shows that three aggregates had less than 10% and 20% of particles with maximum to minimum dimension ratios 5:1 and 3:1, respectively. It is expected that present study will be helpful in understanding the shape parameters for different types of aggregates. © 2013 American Society of Civil Engineers.

关键词： Aggregates

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Unidirectional rectifier based on hybrid modular multilevel cascade converter — Double-star chopper-cells

Unidirectional rectifier based on hybrid modular multilevel ...

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Brazilian Power Electronics Conference, COBEP

作者： Italo Roger F. M. P. da Silva Alexandre C. Oliveira Cursino B. Jacobina Camila S. Gehrke Post-graduate Program in Electrical Engineering - PPgEE/COPELE Department of Electrical Engineering (DEE) Federal University of Campina Grande (UFCG) Aprígio Veloso Campina Grande-PB Brazil

In this paper a hybrid topology of Modular Multilevel Cascade Converter (MMCC) - Double-Star Chopper-Cells (DSCC) is proposed. This configuration is applied as a unidirectional controlled single-phase rectifier, wherein one of the converter legs is composed by diodes instead of the submodules (SMs) connections. In order to ensure the energy balance among the local SM capacitors, a voltage balancing control strategy is also presented. Besides, a grid current control strategy associated to a method that eliminates zero-crossing distortion caused by the diode leg is proposed, resulting in a power-factor correction (PFC) and a sinusoidal grid current. Experimental results are presented and allow validating the control strategies.

关键词： Voltage control Topology Capacitors Radio frequency Current control Inductors Harmonic analysis

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Active Power Line Conditioner based on Modular Multilevel Cascade Converter - Double-Star Chopper-Cells

Active Power Line Conditioner based on Modular Multilevel Ca...

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Annual Conference of Industrial Electronics Society

作者： Italo Roger F. M. P. da Silva Alexandre C. Oliveira Cursino B. Jacobina Camila S. Gehrke Victor F. M. B. Melo Post-graduate Program in Electrical Engineering - PPgEE/COPELE Campina Grande-PB Brazil Department of Electrical Engineering (DEE) Federal University of Campina Grande (UFCG) Campina Grande-PB Brazil

ISBN: (纸本)9781479902255

In this paper an Active Power Line Conditioner (APLC) is proposed based on a Modular Multilevel Cascade Converter (MMCC) - Double Star Chopper Cells (DSCC) topology. A higher-voltage, low-switching frequency IGBT converter is used to achieve harmonic minimization. Compared to the conventional APLC topology, the proposed approach employs lower DC-link voltage, lower voltage in the power devices, flexible output voltage level, fault protection, less prone to noise, loss reduction, among others features considered in this work. Experimental results show that the proposed active power filter topology is capable of minimizing load harmonics and compensating reactive power at the Point of Commom Coupling (PCC).

关键词： Voltage control Harmonic analysis Capacitors Power system harmonics Radio frequency Topology Inductance

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Power quality control of wind-diesel hybrid power systems using fuzzy PI controller

Power quality control of wind-diesel hybrid power systems us...

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2012 3rd International Conference on Manufacturing Science and Technology, ICMST 2012

作者： Yang, Su-Hyung Kim, Ho-Chan Boo, Chang-Jin Kang, Min-Jae Kim, Eel-Hwan Ko, Hee-Sang Lee, Kwang Y. Multidisciplinary Graduate School Program for Wind Energy Jeju National University Korea Republic of Department of Electrical Engineering Jeju National University Korea Republic of Department of Electronic Engineering Jeju National University Korea Republic of Product Development Team/Wind Turbine Division Samsung Heavy Industries Co Korea Republic of Department of Electrical and Computer Engineering Baylor University United States

ISBN: (纸本)9783037855638

This paper proposes a modeling and controller design approach for a wind-diesel hybrid system including dump load. The proposed control scheme for power quality is fuzzy PI controller which has advantages of PI and fuzzy controller. Simulation results show that the proposed controller is more effective against disturbances caused by wind speed and load variation than the PI controller, and thus it contributes to a better quality wind-diesel hybrid power system. © (2013) Trans Tech Publications, Switzerland.

关键词： Controllers

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AC-AC DRIVE SYSTEMS WITH OPEN-END FIVE-PHASE MACHINE AND SIXTEEN-LEG DC-LINK CONVERTER

AC-AC DRIVE SYSTEMS WITH OPEN-END FIVE-PHASE MACHINE AND SIX...

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Brazilian Power Electronics Conference

作者： Cursino B. Jacobina Isaac S. de Freitas Lilian G. de Azevedo Mauricio B. R. Correa Post-Graduate Program in Electrical Engineering - PPgEE - COPELE Electrical Engineering Department - DEE - Federal University of Campina Grande - UFCG Alternative and Renewable Energy Center - CEAR Electrical Engineering Department - DEE - Federal University of Paraiba - UFPB

ISBN: (纸本)9781479902712

This paper presents two ac machine drive systems based on three-phase to five-phase ac-ac converters and open-windings five-phase machine. The drive systems are suitable to applications in which high power, performance and reliability are required using low power and voltage switches and low dc-link capacitor voltages. The configuration I employs an input transformer with two secondary taps at the grid side, two three-phase three-leg converters and one ten-leg converter (totalling sixteen legs). The configuration II employs a low-power series transformer at the grid side, two three-phase three-leg converters, and one ten-leg converter. Both configurations permit to reduce the power and voltage ratings of power switches and also the dc-link capacitor size. The paper presents the comprehensive models of the proposed systems, modulation strategies and a general comparison with conventional configuration. Simulated and experimental results are presented.

关键词： Ac-Ac Converter Five-phase Machine Motor Drive Open-end windings Power Converter

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Deformation of porous, nanostructured silver at room temperature and 150C°

Deformation of porous, nanostructured silver at room tempera...

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2012 MRS Fall Meeting

作者： Noiseau, Guillaume Becker, Michael F. Keto, John W. Kovar, Desiderio Materials Science and Engineering Graduate Program University of Texas at Austin Austin TX 78712-1591 United States Department of Electrical and Computer Engineering University of Texas Austin TX United States Department of Physics University of Texas Austin TX United States Department of Mechanical Engineering University of Texas Austin TX United States

ISBN: (纸本)9781632661067

Porous, nanostructured silver samples were produced using a direct-write method where a nanoparticle aerosol consisting of particles with a mean size of approximately 5 nm were accelerated to speeds of approximately 1000 m/sec and impacted onto a translating substrate [1]. The impacting particles have sufficient energy to stick to the substrate, allowing patterned thick films to be directly written from the aerosol without a mask. Unlike other low temperature processing routes for achieving patterned films, no organics are added that can interfere with post-deposition processing. Typical films are 5-100 μm thick, up to several centimeters long, and have an as-deposited relative densities as high as 70% of bulk Ag. Compression tests were carried out in steps at room temperature and at 150°C under constant displacement rates. Local strain and densification were measured by optical profilometry between each compression step. The results can be used as a starting point to better understand the mechanisms that govern plasticity, creep, and sintering in nanostructured, porous silver at low processing temperatures. © 2013 Materials Research Society.

关键词： Room temperature

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Vibration Characterization Using Gaussian Laser Beam

Vibration Characterization Using Gaussian Laser Beam

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International Conference on Modeling, Simulation and Applied Optimization

作者： Naveed A. Abbasi Taha Landolsi Rached Dhaouadi Graduate Program of Mechatronics Engineering American University of Sharjah Department of Computer Engineering American University of Sharjah Department of Electrical Engineering American University of Sharjah

ISBN: (纸本)9781467358125

The objective of this research is to present a neural network based optical vibration sensor using a quad-cell photo-detector array. The proposed system uses a He-Ne laser source whose Gaussian beam impinges on the photo-detector array. The optical power distribution from the photo-detectors is fed to vibration monitoring system which maps the power distribution to the x-y position of the laser beam center. The vibration monitoring system uses artificial neural networks for function approximation to yield the correct mapping and estimate the x-y positions of the laser beam center which are then used for vibration characterization. An experimental setup of the system is developed and then trained using neural networks. The results obtained show the effectiveness of neural networks to estimate the vibration frequency and magnitude of a vibrating system.

关键词： Vibration monitoring Neural network Optical sensor Quad-cell photo detector array

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Simplifying complexity: Modeling the process of collaboration between artists and scientists 13

Simplifying complexity: Modeling the process of collaboratio...

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31st ACM International Conference on Design of Communication, SIGDOC 2013

作者： McDougall, Zoe Fels, Sidney Lopes, Dominic O'Brien, Heather L. Interdisciplinary Studies Graduate Program University of British Columbia Vancouver BC Canada Department of Electrical and Computer Engineering University of British Columbia Vancouver BC Canada Department of Philosophy University of British Columbia Vancouver BC Canada The iSchool University of British Columbia Vancouver BC Canada

ISBN: (纸本)9781450321310

This paper presents a modal model to describe and facilitate communication design in collaborative settings. This model was conceived of as a tool for understanding the nature of collaboration between artists and scientists in an interdisciplinary case study, but can be used cross-disciplinarily and ultimately prescriptively. The model may reveal shifting patterns of interaction between collaborators over time and through multiple processes. Patterns may be revealed in setting and attaining benchmark goals as well as in general group communication. Different collaborative modes (ontological relationships between collaborators) and modes of being (phenomenological relationship between collaborators) form the basis for sixty collaborative possibilities with two or more collaborators. © 2013 ACM.

关键词： communication collaboration models charles s. peirce

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Power hardware-in-the-loop (PHIL) based on FPGA

Power hardware-in-the-loop (PHIL) based on FPGA

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Brazilian Power Electronics Conference, COBEP

作者： Camila S. Gehrke Alexandre C. Oliveira Antonio Marcus N. Lima Italo Roger F. M. P. da Silva Universidade Federal de Campina Grande Campina Grande PB BR Department of Electrical Engineering (DEE) Federal University of Campina Grande (UFCG) Campina Grande PB Brazil Post-graduate Program in Electrical Engineering - PPgEE/COPELE

Nowadays, to improve power quality and power demand, several studies point to the use of Active Power Line Conditioners (APLCs) and Distributed Generation (DG), both based on power electronic devices. Considering various distributed power devices with cooperative operation, the strategies evaluation to compensate harmonics and correct power factor (PF) in Electric Power System (EPS) is only possible to be investigated by simulation. In this work, it is proposed a Power Hardware-in-the-loop (PHIL) system for testing the APLCs operation. The proposed PHIL system can evaluate the performance of the APLC control strategies and EPS dynamic response under APLC operation. Furthermore, the same platform can be used to integrating DGs with the EPS as it also uses power electronic devices.

关键词： Field programmable gate arrays Harmonic analysis Digital signal processing Power harmonic filters Power quality

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Analysis of Needle-Tissue Friction during Vibration-Assisted Needle Insertion

Analysis of Needle-Tissue Friction during Vibration-Assisted...

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IEEE/RSJ International Conference on Intelligent Robots and Systems

作者： Iman Khalaji Mostafa Hadavand Ali Asadian Rajni V. Patel Michael D. Naish Canadian Surgical Technologies and Advanced Robotics (CSTAR) Lawson Health Research Institute London Canada Biomedical Engineering Graduate Program Western University Department of Electrical and Computer Engineering Western University Department of Electrical and Computer Engineering and the Department of Surgery Western University Department of Mechanical and Materials Engineering and the Department of Electrical and Computer Engineering Western University

ISBN: (纸本)9781467363563

In this paper, a vibration-assisted needle insertion technique has been proposed in order to reduce needle-tissue friction. The LuGre friction model was employed as a basis for the current study and the model was extended and analyzed to include the impact of high-frequency vibration on translational friction. Experiments were conducted to evaluate the role of insertion speed as well as vibration frequency on frictional effects. In the experiments conducted, an 18 GA brachytherapy needle was vibrated and inserted into an ex-vivo soft tissue sample using a pair of amplified piezoelectric actuators. Analysis demonstrates that the translational friction can be reduced by introducing a vibratory low-amplitude motion onto a regular insertion profile, which is usually performed at a constant rate.

关键词： friction high frequency vibration LuGre friction Vibrational frequencies Insertion Mutation Pairing

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