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Full-Text Articles in Engineering
Effect Of Compaction Energy On Shear Wave Velocity Of Dynamically Compacted Silty Sand Soil, Buddhima Indraratna, Ana Heitor, Cholachat Rujikiatkamjorn
Effect Of Compaction Energy On Shear Wave Velocity Of Dynamically Compacted Silty Sand Soil, Buddhima Indraratna, Ana Heitor, Cholachat Rujikiatkamjorn
Faculty of Engineering - Papers (Archive)
This study was focused on the effects of compaction energy on the dynamic properties of a silty sand in its as-compacted state in relation to the measured values of matric suction. The influence of the imparted energy on the shear wave velocity and the small-strain shear modulus of the compacted soil was studied for three different energy levels that correspond to the standard Proctor as well as reduced and enhanced. The specimens were prepared with moisture contents ranging from the dry to wet of optimum, and subsequently compacted to known dry unit weights for which the corresponding matric suction and …
Globular Reduced Graphene Oxide-Metal Oxide Structures For Energy Storage Applications, Alfred Chidembo, Seyed Hamed Aboutalebi, Konstantin Konstantinov, Maryam Salari, Brad R. Winton, Sima Aminorroaya-Yamini, Ivan Nevirkovets, Hua-Kun Liu
Globular Reduced Graphene Oxide-Metal Oxide Structures For Energy Storage Applications, Alfred Chidembo, Seyed Hamed Aboutalebi, Konstantin Konstantinov, Maryam Salari, Brad R. Winton, Sima Aminorroaya-Yamini, Ivan Nevirkovets, Hua-Kun Liu
Faculty of Engineering - Papers (Archive)
In this work, we employed an in situ spray pyrolysis approach to fabricate metal oxide-graphene composites with highly porous morphologies.The materials exhibited unique globular structures comprising metal oxide nanoparticles embedded between graphene sheets with high capacitance.
Modelling Net Zero Energy Options For A Sustainable Buildings Research Centre, Paul Cooper, Xiong Liu, Prabuono Buyung Kosasih, Rui Yan
Modelling Net Zero Energy Options For A Sustainable Buildings Research Centre, Paul Cooper, Xiong Liu, Prabuono Buyung Kosasih, Rui Yan
Faculty of Engineering - Papers (Archive)
This paper describes the preliminary design and energy analysis of a university research building in NSW, Australia. This case study highlights some of the challenges confronting those wishing to design cost-effective net zero energy buildings in the Australian higher education sector and beyond. The Sustainable Buildings Research Centre (SBRC) is presently under development at the University of Wollongong and will be a unique building in the local region and an exemplar in respect of demonstration of a range of technical and operational means of reducing greenhouse emissions and other ecological impacts. This paper provides details on the constraints and opportunities …
Influence Of Temperature On Coal Sorption Characteristics And The Theory Of Coal Surface Free Energy, Lei Zhang, Najdat I. Aziz, Ting Ren, Zhongwei Wang
Influence Of Temperature On Coal Sorption Characteristics And The Theory Of Coal Surface Free Energy, Lei Zhang, Najdat I. Aziz, Ting Ren, Zhongwei Wang
Faculty of Engineering - Papers (Archive)
An experimental study was undertaken to examine the sorption and desorption characteristics of coal at temperatures of 35 °C, 45 °C and 55 °C. The study focused on the effect of changes in temperature and coal particle sizes on gas sorption and desorption characteristics. The coal size used ranged from fragmented coals, 16 mm, 8 mm, 2.4 mm, powdered coal of 150 μm and 54 mm core samples. The samples were tested in pressure vessels, known as “bombs”, charged with CO2 gas at different pressure levels up to a maximum of 4000 kPa. It was found that temperature has a …
Energy-Loss Rate Of A Fast Particle In Graphene, Yee Sin Ang, Chao Zhang, Chun Kee
Energy-Loss Rate Of A Fast Particle In Graphene, Yee Sin Ang, Chao Zhang, Chun Kee
Faculty of Engineering - Papers (Archive)
The energy-loss rate of a fast particle in graphene is studied. The energy-loss rate always increases with increasing incident particle energy, which is quite unusual when compared to electron gas in normal metal. Graphene exhibits a “discriminating” behavior where there exists a low energy cut-off below which the scattering process is strictly forbidden, leading to lossless traverse of an external particle in graphene. This low energy cutoff is of the order of nearest neighbor hopping bandwidth. Our results suggest that backscattering is also absent in the external particle scattering of graphene.
Mechanical Model Of A Floating Oscillating Water Column Wave Energy Conversion Device, Brad Stappenbelt, Paul Cooper
Mechanical Model Of A Floating Oscillating Water Column Wave Energy Conversion Device, Brad Stappenbelt, Paul Cooper
Faculty of Engineering - Papers (Archive)
The study of floating oscillating water column (OWC) wave energy conversion (WEC) device performance includes analysis of the dynamic coupling of the water column and the floating structure. In the present investigation, a mechanical oscillator model was proposed in order to examine this relationship for the heave motion of a floating wave energy conversion device. Characterisation of the dynamic system optimal behaviour was performed by examining the effect of relative OWC and floating structure natural frequencies, the phase relationships of the various system components and the optimal power take-off damping of the system. It was determined that separation of the …
A Systematic Optimization And Operation Of Central Chilling Systems For Energy Efficiency And Sustainability, Zhenjun Ma, Shengwei Wang
A Systematic Optimization And Operation Of Central Chilling Systems For Energy Efficiency And Sustainability, Zhenjun Ma, Shengwei Wang
Faculty of Engineering - Papers (Archive)
This paper presents an optimization strategy for optimal control and operation of building central chilling systems in order to minimize their energy consumption and provide improved control performance. The strategy is formulated using a systematic approach, in which the characteristics and interactions among the components and subsystems in the central chilling system are considered. The simplified models of major components are used in the strategy as the performance predictors to estimate the system energy performance and responses to the changes of control settings and working conditions. To ensure the models to provide reliable estimates when the working condition changes, the …
Optimisation Of A Floating Oscillating Water Column Wave Energy Converter, Brad Stappenbelt, Paul Cooper
Optimisation Of A Floating Oscillating Water Column Wave Energy Converter, Brad Stappenbelt, Paul Cooper
Faculty of Engineering - Papers (Archive)
The analysis of floating oscillating water column (OWC) wave energy conversion (WEC) devices involves the coupled dynamics of the water column and the floating structure. In the present study, a mechanical oscillator model was used to examine this relationship for the heave motion of a floating wave energy conversion device. Optimal power take-off damping of the system was determined and the effects on maximum power capture examined. The influence of relative OWC and floating structure natural frequencies on OWC WEC device optimisation was also investigated.
Improved Controller For High Temperature Super Conducting Magnetic Energy Storage (Hts-Smes), Danny Soetanto, M V. Aware
Improved Controller For High Temperature Super Conducting Magnetic Energy Storage (Hts-Smes), Danny Soetanto, M V. Aware
Faculty of Engineering - Papers (Archive)
This paper describes a novel controller for a High Temperature Superconducting Magnetic Energy Storage (HTSSMES) that can ensure (a) fast return of energy to the superconducting coil under constant current mode and (b) a constant and sinusoidal input supply current irrespective of the varying load demand with and without harmonics. A special feature of this controller is its ability to smoothly charge the superconducting coil using constant current charging so that it can be ready for the next discharging operation as soon as possible. Analysis of the circuit operation under hysteresis control is presented in details. Simulation and experimental results …
Superconducting Magnetic Energy Storage Systems For Power System Applications, Danny Soetanto, K.W.E Cheng
Superconducting Magnetic Energy Storage Systems For Power System Applications, Danny Soetanto, K.W.E Cheng
Faculty of Engineering - Papers (Archive)
Advancement in both superconducting technologies and power electronics led to High Temperature Superconducting Magnetic Energy Storage Systems (SMES) having some excellent performances for use in power systems, such as rapid response (millisecond), high power (multi-MW), high efficiency, and four- quadrant control. This paper provides a review on SMES applications to power systems.
Packaging Effects On Radfet Sensors For High Energy Physics Experiments, Julien Mekki, Laurent Dusseau, Maurice Glaser, Susanna Guatelli, Michael Moll, Maria Grazia Pia, Federico Ravotti
Packaging Effects On Radfet Sensors For High Energy Physics Experiments, Julien Mekki, Laurent Dusseau, Maurice Glaser, Susanna Guatelli, Michael Moll, Maria Grazia Pia, Federico Ravotti
Faculty of Engineering - Papers (Archive)
RadFETs in customized chip carrier packages are installed in the LHC Experiments as radiation monitors. The package influence on the dose measurement in the complex LHC radiation environment is evaluated using Geant4 simulations and experimental data.
Hybrid Fuel Cell And Energy Storage Systems Using Superconducting Coil Or Batteries For Clean Electricity Generation, Danny Soetanto, Kai Ding
Hybrid Fuel Cell And Energy Storage Systems Using Superconducting Coil Or Batteries For Clean Electricity Generation, Danny Soetanto, Kai Ding
Faculty of Engineering - Papers (Archive)
This paper described a novel design of a hybrid fuel cell and energy storage system using high temperature superconducting energy storage system (HT-SMES) or batteries to meet fast changing load. The power electronic switches in the converter of the energy storage system are controlled in such a way that the amplitude and waveform of the inverter output current from the fuel cell is tightly regulated to follow a sinusoidal reference waveform. In this way, the energy storage system is used to supply the fast changing part of the load and the fuel cell system continuously supplies a constant full load …
Cfd Analysis Of The Performance Of Blade Cascades For Air Turbines In Oscillating Water Column Wave Energy Conversion Systems, Andrei Gareev, Paul Cooper, Prabuono B. Kosasih
Cfd Analysis Of The Performance Of Blade Cascades For Air Turbines In Oscillating Water Column Wave Energy Conversion Systems, Andrei Gareev, Paul Cooper, Prabuono B. Kosasih
Faculty of Engineering - Papers (Archive)
This paper presents the results of a detailed CFD (Computational Fluid Dynamics) analysis of the performance of blade cascades in reversing flow axial flow turbines for use as power take-off systems in Oscillating Water Column (OWC) Wave Energy Conversion (WEC) systems. In the first part of the paper a fundamental CFD analysis of the lift and drag data for various aerofoil profiles, using a number of different turbulence models, is described and quantitative comparisons are made with experimental data previously published by other researchers. The second part of the paper then describes CFD results of the performance of various rotors …
Evaluation Of Calculated Arc Energy Heat Input In Mmaw Processes, Zoran Sterjovski, John Norrish, Rian Holdstock, Glen Sloan, David J. Nolan
Evaluation Of Calculated Arc Energy Heat Input In Mmaw Processes, Zoran Sterjovski, John Norrish, Rian Holdstock, Glen Sloan, David J. Nolan
Faculty of Engineering - Papers (Archive)
The ability of manual metal arc welders to reach target heat input (HI) values between 1.3 kJ/mm and 2.9 kJ/mm by varying weld travel speed was examined. Weld process data was collected during the downhand and overhead welding of 6 highly restrained quenched and tempered (QT) steel plates and the results showed that the measured average H I values were closely matched to the target HI. However, there was considerable scatter, particularly at higher H I targets, which warranted investigation. The frequency at which welders achieved their target H I (or travel speed) decreased at higher H I values, but …