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Assessing The Vulnerability Of Pumping Stations To Trash Blockage In Coastal Mega-Cities Of Developing Nations, Robert Ighodaro Ogie, Sarah Dunn, Tomas Holderness, Etienne Turpin 2017 University of Wollongong

Assessing The Vulnerability Of Pumping Stations To Trash Blockage In Coastal Mega-Cities Of Developing Nations, Robert Ighodaro Ogie, Sarah Dunn, Tomas Holderness, Etienne Turpin

Faculty of Engineering and Information Sciences - Papers: Part A

Pumping stations are important flood mitigation infrastructure used in coastal cities to remove accumulating floodwater from low-lying areas, where drainage is naturally poor due to very low slope gradient. In coastal mega-cities situated in developing nations, these pumping stations are often vulnerable to trash blockage as a result of frequent dumping of solid waste in water bodies. Given that blocked pumps are common causes of drainage infrastructure failure, the inability to identify the most vulnerable pumping stations can lead to inefficient allocation of limited resources for preventative maintenance of the drainage system. This study proposes an approach for measuring and ...


Factors Governing Mass Transfer During Membrane Electrodialysis Regeneration Of Licl Solution For Liquid Desiccant Dehumidification Systems, Ali Hussein Al-Jubainawi, Zhenjun Ma, Yi Guo, Long D. Nghiem, Paul Cooper, Weihua Li 2017 University of Wollongong

Factors Governing Mass Transfer During Membrane Electrodialysis Regeneration Of Licl Solution For Liquid Desiccant Dehumidification Systems, Ali Hussein Al-Jubainawi, Zhenjun Ma, Yi Guo, Long D. Nghiem, Paul Cooper, Weihua Li

Faculty of Engineering and Information Sciences - Papers: Part A

This study investigates the mass transfer mechanisms and the performance of membrane electrodialysis (ED) for regenerating lithium chloride (LiCl) solution commonly used in liquid desiccant dehumidification systems. Experiments were conducted using an ED experimental system while numerical simulation was performed using COMSOL Multiphysics. The results showed that the water flux transfer due to osmosis and electro-osmosis during ED regeneration of LiCl liquid desiccant was significant and could not be ignored. The water flux due to osmosis and electro-osmosis is directly associated with the osmotic gradient and the applied current between the cathode and anode, respectively. The average flux of water ...


Micromechanics-Based Investigation Of Fouled Ballast Using Large-Scale Triaxial Tests And Discrete Element Modeling, Ngoc Trung Ngo, Buddhima Indraratna, Cholachat Rujikiatkamjorn 2017 University of Wollongong

Micromechanics-Based Investigation Of Fouled Ballast Using Large-Scale Triaxial Tests And Discrete Element Modeling, Ngoc Trung Ngo, Buddhima Indraratna, Cholachat Rujikiatkamjorn

Faculty of Engineering and Information Sciences - Papers: Part A

Railway ballast comprises unbounded discrete grains that are often used to form a load-bearing platform for tracks. Ballast degradation as trains pass over the tracks and infiltration of external fines including slurried (pumped) fine subgrade soils are two of the main reasons for ballast fouling. Fouling causes tracks to settle and also reduces the load-bearing capacity, which is associated with a reduction in internal friction and increased lateral spreading of the ballast layer. This paper presents a study of mobilized friction angle, volumetric behavior, and associated evolutions of contact and fabric anisotropy of fouled ballast subjected to monotonic triaxial loading ...


Optimum Resistive Type Fault Current Limiter: An Efficient Solution To Achieve Maximum Fault Ride-Through Capability Of Fixed-Speed Wind Turbines During Symmetrical And Asymmetrical Grid Faults, Seyed Behzad Naderi, Michael Negnevitsky, Amin Jalilian, Mehrdad Tarafdar Hagh, Kashem M. Muttaqi 2017 University of Tasmania (UTAS)

Optimum Resistive Type Fault Current Limiter: An Efficient Solution To Achieve Maximum Fault Ride-Through Capability Of Fixed-Speed Wind Turbines During Symmetrical And Asymmetrical Grid Faults, Seyed Behzad Naderi, Michael Negnevitsky, Amin Jalilian, Mehrdad Tarafdar Hagh, Kashem M. Muttaqi

Faculty of Engineering and Information Sciences - Papers: Part A

This paper proposes an optimum resistive type fault current limiter (OR-FCL) as an efficient solution to achieve maximum fault ride-through (FRT) capability of fixed-speed wind turbines (FSWT) during various grid faults. In this paper, a dedicated control circuit is designed for the OR-FCL that enables it to insert an optimum value of resistance in the FSWT's fault current's path for improving transient behavior of the FSWT. The optimum resistance value depends on fault location and prefault active power. The control circuit of the proposed OR-FCL is capable of calculating the optimum resistance value for all the prefault conditions ...


Multivariate Spatial Data Fusion For Very Large Remote Sensing Datasets, Hai Nguyen, Noel A. Cressie, Amy Braverman 2017 Caltech

Multivariate Spatial Data Fusion For Very Large Remote Sensing Datasets, Hai Nguyen, Noel A. Cressie, Amy Braverman

Faculty of Engineering and Information Sciences - Papers: Part A

Global maps of total-column carbon dioxide (CO2) mole fraction (in units of parts per million) are important tools for climate research since they provide insights into the spatial distribution of carbon intake and emissions as well as their seasonal and annual evolutions. Currently, two main remote sensing instruments for total-column CO2 are the Orbiting Carbon Observatory-2 (OCO-2) and the Greenhouse gases Observing SATellite (GOSAT), both of which produce estimates of CO2 concentration, called profiles, at 20 different pressure levels. Operationally, each profile estimate is then convolved into a single estimate of column-averaged CO2 using a linear pressure weighting function. This ...


A Robust And Tuneable Mid-Infrared Optical Switch Enabled By Bulk Dirac Fermions, Chunhui Zhu, Fengqiu Wang, Yafei Meng, Xiang Yuan, Faxian Xiu, Hongyu Luo, Yazhou Wang, Jianfeng Li, Xinjie Lv, Liang He, Yongbing Xu, Junfeng Liu, C Zhang, Yi Shi, Rong Zhang, Shining Zhu 2017 Nanjing University

A Robust And Tuneable Mid-Infrared Optical Switch Enabled By Bulk Dirac Fermions, Chunhui Zhu, Fengqiu Wang, Yafei Meng, Xiang Yuan, Faxian Xiu, Hongyu Luo, Yazhou Wang, Jianfeng Li, Xinjie Lv, Liang He, Yongbing Xu, Junfeng Liu, C Zhang, Yi Shi, Rong Zhang, Shining Zhu

Faculty of Engineering and Information Sciences - Papers: Part A

Pulsed lasers operating in the mid-infrared (3–20 μm) are important for a wide range of applications in sensing, spectroscopy, imaging and communications. Despite recent advances with mid-infrared gain platforms, the lack of a capable pulse generation mechanism remains a significant technological challenge. Here we show that bulk Dirac fermions in molecular beam epitaxy grown crystalline Cd3As2, a three-dimensional topological Dirac semimetal, constitutes an exceptional ultrafast optical switching mechanism for the mid-infrared. Significantly, we show robust and effective tuning of the scattering channels of Dirac fermions via an element doping approach, where photocarrier relaxation times are found ...


History Of International Workshop On Mini-Micro- And Nano- Dosimetry (Mmnd) And Innovation Technologies In Radiation Oncology (Itro), Anatoly B. Rosenfeld, Marco Zaider, J Yamada, M Zelefsky 2017 University of Wollongong

History Of International Workshop On Mini-Micro- And Nano- Dosimetry (Mmnd) And Innovation Technologies In Radiation Oncology (Itro), Anatoly B. Rosenfeld, Marco Zaider, J Yamada, M Zelefsky

Faculty of Engineering and Information Sciences - Papers: Part A

The biannual MMND (former MMD) - IPCT workshops was founded in collaboration between the Centre for Medical Radiation Physics, University of Wollongong and the Memorial Sloan Kettering Cancer Center (MSKCC) in 2001 and has become an important international multidisciplinary forum for the discussion of advanced quality assurance (QA) dosimetry technology for radiation therapy and space science, as well as advanced technologies for clinical cancer treatment.


New 3d Silicon Detectors For Dosimetry In Microbeam Radiation Therapy, Michael L. F Lerch, Andrew Dipuglia, Matthew Cameron, Pauline Fournier, Jeremy A. Davis, Marco Petasecca, Iwan Cornelius, Vladimir Perevertaylo, Anatoly B. Rosenfeld 2017 University of Wollongong

New 3d Silicon Detectors For Dosimetry In Microbeam Radiation Therapy, Michael L. F Lerch, Andrew Dipuglia, Matthew Cameron, Pauline Fournier, Jeremy A. Davis, Marco Petasecca, Iwan Cornelius, Vladimir Perevertaylo, Anatoly B. Rosenfeld

Faculty of Engineering and Information Sciences - Papers: Part A

Microbeam Radiation Therapy (MRT) involves the use of a spatially fractionated beam of synchrotron generated X-rays to treat tumours. MRT treatment is delivered via an array of high dose 'peaks' separated by low dose 'valleys'. A good Peak to Valley Dose Ratio (PVDR) is an important indicator of successful treatment outcomes. MRT dosimetry requires a radiation hard detector with high spatial resolution, large dynamic range, which is ideally real-time and tissue equivalent. We have developed a Silicon Strip Detector (SSD) and very recently, a new 3D MESA SSD to meet the very stringent requirements of MRT dosimetry. We have compared ...


Optimisation Of Output Factor Measurements Using The Magic Plate 512 Silicon Dosimeter Array In Small Megavoltage Photon Fields, Kananan Utitsarn, Z A. Alrowaili, Nauljun Stansook, Michael L. F Lerch, Marco Petasecca, Martin G. Carolan, Anatoly B. Rosenfeld 2017 University of Wollongong

Optimisation Of Output Factor Measurements Using The Magic Plate 512 Silicon Dosimeter Array In Small Megavoltage Photon Fields, Kananan Utitsarn, Z A. Alrowaili, Nauljun Stansook, Michael L. F Lerch, Marco Petasecca, Martin G. Carolan, Anatoly B. Rosenfeld

Faculty of Engineering and Information Sciences - Papers: Part A

We evaluate the impact of an air gap and optimization of this air gap for the MP512 silicon detector array when operated in dosimetry mode for small photon field measurements in solid water. We present output factor measurements for 6MV and 10 MV photon beams with the square field sizes ranging from 0.5 to 10 cm2. The size of the air gap above the MP512 detector was changed from 0.5, 1.0, 1.2, 2.0 and 2.6 mm. We compare the output factors measurements of the MP512 with EBT3 film and the MOSkin dosimeter ...


Monte Carlo Characterisation Of The Dose Magnifying Glass For Proton Therapy Quality Assurance, Aaron Merchant, Susanna Guatelli, Marco Petasecca, Michael A. Jackson, Anatoly B. Rosenfeld 2017 University of Wollongong

Monte Carlo Characterisation Of The Dose Magnifying Glass For Proton Therapy Quality Assurance, Aaron Merchant, Susanna Guatelli, Marco Petasecca, Michael A. Jackson, Anatoly B. Rosenfeld

Faculty of Engineering and Information Sciences - Papers: Part A

A Geant4 Monte Carlo simulation study was carried out to characterise a novel silicon strip detector, the Dose Magnifying Glass (DMG), for use in proton therapy Quality Assurance. We investigated the possibility to use DMG to determine the energy of the incident proton beam. The advantages of DMG are quick response, easy operation and high spatial resolution. In this work we theoretically proved that DMG can be used for QA in the determination of the energy of the incident proton beam, for ocular and prostate cancer therapy. The study was performed by means of Monte Carlo simulations Experimental measurements are ...


Introducing Dynamic Dosimaging: Potential Applications For Mri-Linac, Peter E. Metcalfe, Sarah Alnaghy, Matthew Newall, Maegan Gargett, Mitchell Duncan, Gary P. Liney, Jarrad Begg, Bradley M. Oborn, Marco Petasecca, Michael L. F Lerch, Anatoly B. Rosenfeld 2017 University of Wollongong

Introducing Dynamic Dosimaging: Potential Applications For Mri-Linac, Peter E. Metcalfe, Sarah Alnaghy, Matthew Newall, Maegan Gargett, Mitchell Duncan, Gary P. Liney, Jarrad Begg, Bradley M. Oborn, Marco Petasecca, Michael L. F Lerch, Anatoly B. Rosenfeld

Faculty of Engineering and Information Sciences - Papers: Part A

The new era of intra-fraction dose tracking in radiation therapy delivery demands new dosimetry methods, whereby a moving frame of reference as a function of time may be required. This introduces a new paradigm into radiation therapy dose verification. The term we propose to describe this is dynamic dosimaging, which by our definition is tracking the location of a dosimeter array in real time during on-line radiation dose acquisition.


Selection Bias In The Reported Performances Of Ad Classification Pipelines, Alex F. Mendelson, Maria A. Zuluaga, Marco Lorenzi, Brian F. Hutton, Sebastien Ourselin 2017 University College London

Selection Bias In The Reported Performances Of Ad Classification Pipelines, Alex F. Mendelson, Maria A. Zuluaga, Marco Lorenzi, Brian F. Hutton, Sebastien Ourselin

Faculty of Engineering and Information Sciences - Papers: Part A

The last decade has seen a great proliferation of supervised learning pipelines for individual diagnosis and prognosis in Alzheimer's disease. As more pipelines are developed and evaluated in the search for greater performance, only those results that are relatively impressive will be selected for publication. We present an empirical study to evaluate the potential for optimistic bias in classification performance results as a result of this selection. This is achieved using a novel, resampling-based experiment design that effectively simulates the optimisation of pipeline specifications by individuals or collectives of researchers using cross validation with limited data. Our findings indicate ...


Model-Based Optimization Of Ground Source Heat Pump Systems, Zhenjun Ma, Lei Xia 2017 University of Wollongong

Model-Based Optimization Of Ground Source Heat Pump Systems, Zhenjun Ma, Lei Xia

Faculty of Engineering and Information Sciences - Papers: Part A

This paper presents the development of an optimization strategy for ground source heat pump (GSHP) systems equipped with variable speed pumps in the ground loop system. The optimization problem is formulated using a model-based approach, in which the component models are used to estimate the system performance under various trial settings and an exhaustive search method is used to identify the optimal settings under the search ranges defined. The variable optimized is the outlet water temperature from the ground heat exchangers, which can be used as a set-point to control the operation of the variable speed pumps in the ground ...


Thermal Comfort Evaluation Of A Mixed-Mode Ventilated Office Building With Advanced Natural Ventilation And Underfloor Air Distribution Systems, Xiang Deng, Georgios Kokogiannakis, Zhenjun Ma, Paul Cooper 2017 University of Wollongong

Thermal Comfort Evaluation Of A Mixed-Mode Ventilated Office Building With Advanced Natural Ventilation And Underfloor Air Distribution Systems, Xiang Deng, Georgios Kokogiannakis, Zhenjun Ma, Paul Cooper

Faculty of Engineering and Information Sciences - Papers: Part A

This study uses field monitoring and post occupancy evaluation (POE) surveys to investigate the indoor thermal comfort of an office building that is located in subtropical zone. The building is special as it combines advanced natural ventilation (ANV) strategies and underfloor air distribution (UFAD) systems. A comparison between a static thermal comfort model and a dynamic thermal comfort model is also conducted. The results show that the thermal comfort conditions in the case study building are satisfactory in summer while in winter there is evidence of thermal discomfort. For the case study building, the static thermal comfort model gives outputs ...


The Integration Of Mri In Radiation Therapy: Collaboration Of Radiographers And Radiation Therapists, Robba Rai, Shivani Kumar, Vikneswary Batumalai, Doaa Elwadia, Lucy Ohanessian, Ewa Juresic, Lynette Cassapi, Shalini K. Vinod, Lois C. Holloway, Paul J. Keall, Gary P. Liney 2017 University of New South Wales

The Integration Of Mri In Radiation Therapy: Collaboration Of Radiographers And Radiation Therapists, Robba Rai, Shivani Kumar, Vikneswary Batumalai, Doaa Elwadia, Lucy Ohanessian, Ewa Juresic, Lynette Cassapi, Shalini K. Vinod, Lois C. Holloway, Paul J. Keall, Gary P. Liney

Faculty of Engineering and Information Sciences - Papers: Part A

The increased utilisation of magnetic resonance imaging (MRI) in radiation therapy (RT) has led to the implementation of MRI simulators for RT treatment planning and influenced the development of MRI-guided treatment systems. There is extensive literature on the advantages of MRI for tumour volume and organ-at-risk delineation compared to computed tomography. MRI provides both anatomical and functional information for RT treatment planning (RTP) as well as quantitative information to assess tumour response for adaptive treatment. Despite many advantages of MRI in RT, introducing an MRI simulator into a RT department is a challenge. Collaboration between radiographers and radiation therapists is ...


Direct Parametric Reconstruction With Joint Motion Estimation/Correction For Dynamic Brain Pet Data, Jieqing Jiao, Alexandre B. Bousse, Kris Thielemans, Ninon Burgos, Philip Weston, Jonathan M. Schott, David Atkinson, Simon R. Arridge, Brian F. Hutton, Pawel Markiewicz, Sebastien Ourselin 2017 University College London

Direct Parametric Reconstruction With Joint Motion Estimation/Correction For Dynamic Brain Pet Data, Jieqing Jiao, Alexandre B. Bousse, Kris Thielemans, Ninon Burgos, Philip Weston, Jonathan M. Schott, David Atkinson, Simon R. Arridge, Brian F. Hutton, Pawel Markiewicz, Sebastien Ourselin

Faculty of Engineering and Information Sciences - Papers: Part A

Direct reconstruction of parametric images from raw photon counts has been shown to improve the quantitative analysis of dynamic positron emission tomography (PET) data. However it suffers from subject motion which is inevitable during the typical acquisition time of 1-2 hours. In this work we propose a framework to jointly estimate subject head motion and reconstruct the motion-corrected parametric images directly from raw PET data, so that the effects of distorted tissue-to-voxel mapping due to subject motion can be reduced in reconstructing the parametric images with motion-compensated attenuation correction and spatially aligned temporal PET data. The proposed approach is formulated ...


Real-Time In Vivo Rectal Wall Dosimetry Using Moskin Detectors During Linac Based Stereotactic Radiotherapy With Rectal Displacement, Kimberley Legge, Peter B. Greer, Daryl O'Connor, Lee Wilton, Matthew Richardson, Perry Hunter, Alex Wilfert, Jarad Martin, Anatoly B. Rosenfeld, Dean L. Cutajar 2017 University of Newcastle

Real-Time In Vivo Rectal Wall Dosimetry Using Moskin Detectors During Linac Based Stereotactic Radiotherapy With Rectal Displacement, Kimberley Legge, Peter B. Greer, Daryl O'Connor, Lee Wilton, Matthew Richardson, Perry Hunter, Alex Wilfert, Jarad Martin, Anatoly B. Rosenfeld, Dean L. Cutajar

Faculty of Engineering and Information Sciences - Papers: Part A

Background: MOSFET dosimetry is a method that has been used to measure in-vivo doses during brachytherapy treatments and during linac based radiotherapy treatment. Rectal displacement devices (RDDs) allow for safe dose escalation for prostate cancer treatment. This study used dual MOSkin detectors to assess real-time in vivo rectal wall dose in patients with an RDD in place during a high dose prostate stereotactic body radiation therapy (SBRT) boost trial. Methods: The PROMETHEUS study commenced in 2014 and provides a prostate SBRT boost dose with a RDD in place. Twelve patients received two boost fractions of 9.5-10 Gy each delivered ...


The Australian Mri-Linac Program: Measuring Profiles And Pdd In A Horizontal Beam, Jarrad Begg, Armia George, Sarah Alnaghy, Trent Causer, T Alharthi, L Glaubes, Bosheng Dong, Gary Goozee, Gary P. Liney, Lois C. Holloway, Paul J. Keall 2017 University of New South Wales

The Australian Mri-Linac Program: Measuring Profiles And Pdd In A Horizontal Beam, Jarrad Begg, Armia George, Sarah Alnaghy, Trent Causer, T Alharthi, L Glaubes, Bosheng Dong, Gary Goozee, Gary P. Liney, Lois C. Holloway, Paul J. Keall

Faculty of Engineering and Information Sciences - Papers: Part A

The Australian MRI-Linac consists of a fixed horizontal photon beam combined with a MRI. Commissioning required PDD and profiles measured in a horizontal set-up using a combination of water tank measurements and gafchromic film. To validate the methodology, measurements were performed comparing PDD and profiles measured with the gantry angle set to 0 and 90° on a conventional linac. Results showed agreement to within 2.0% for PDD measured using both film and the water tank at gantry 90° relative to PDD acquired using gantry 0°. Profiles acquired using a water tank at both gantry 0 and 90° showed agreement ...


Radiation Response And Basic Dosimetric Characterisation Of The 'Magic Plate', Z A. Alrowaili, Michael L. F Lerch, Marco Petasecca, Martin G. Carolan, Anatoly B. Rosenfeld 2017 University of Wollongong

Radiation Response And Basic Dosimetric Characterisation Of The 'Magic Plate', Z A. Alrowaili, Michael L. F Lerch, Marco Petasecca, Martin G. Carolan, Anatoly B. Rosenfeld

Faculty of Engineering and Information Sciences - Papers: Part A

Two Dimensional (2D) silicon diode arrays are often implemented in radiation therapy quality assurance (QA) applications due to their advantages such as: real-time operation (compared to the films), large dynamic range and small size (compared to ionization chambers). The Centre for Medical Radiation Physics, University of Wollongong has developed a multifunctional 2D silicon diode array known as the Magic Plate (MP) for real-time applications and is suitable as a transmission detector for photon flunce mapping (MPTM) or for in phantom dose mapping (MPDM). The paper focusses on the characterisation of the MPDM in terms of output factor and square field ...


Effect Of Scattered Electrons On The 'Magic Plate' Transmission Array Detector Response, Z A. Alrowaili, Michael L. F Lerch, Marco Petasecca, Martin G. Carolan, Anatoly B. Rosenfeld 2017 University of Wollongong

Effect Of Scattered Electrons On The 'Magic Plate' Transmission Array Detector Response, Z A. Alrowaili, Michael L. F Lerch, Marco Petasecca, Martin G. Carolan, Anatoly B. Rosenfeld

Faculty of Engineering and Information Sciences - Papers: Part A

Transmission type detectors can provide a measure of the energy fluence and if they are real-time systems that do not significantly attenuate the radiation beam have a distinct advantage over the current method as Quality Assurance (QA) could in principle be done during the actual patient treatment. The use of diode arrays in QA holds much promise due to real-time operation and feedback when compared to other methods e.g. films which are not real-time. The goal of this work is to describe the characterization of the radiation response of a silicon diode array called the Magic Plate (MP) when ...


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