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Full-Text Articles in Social and Behavioral Sciences

Boundary C^{2,\Alpha} Estimates For Monge-Ampere Type Equations, Yong Huang, Feida Jiang, Jiakun Liu Jan 2015

Boundary C^{2,\Alpha} Estimates For Monge-Ampere Type Equations, Yong Huang, Feida Jiang, Jiakun Liu

Faculty of Engineering and Information Sciences - Papers: Part A

In this paper, we obtain global second derivative estimates for solutions of the Dirichlet problem of certain Monge-Ampère type equations under some structural conditions, while the inhomogeneous term is only assumed to be Hölder continuous and bounded away from zero and infinity. These estimates correspond to those for the standard Monge-Ampère equation obtained by Trudinger and Wang (2008) and by Savin (2013), and have natural applications in optimal transportation and prescribed Jacobian equations.


Comparative Analysis Of The Secondary Electron Yield From Carbon Nanoparticles And Pure Water Medium, Alexey Verkhovtsev, Sally Mckinnon, Pablo De Vera, Eugene Surdutovich, Susanna Guatelli, Andrei V. Korol, Anatoly Rosenfeld, Andrey V. Solov'yov Jan 2015

Comparative Analysis Of The Secondary Electron Yield From Carbon Nanoparticles And Pure Water Medium, Alexey Verkhovtsev, Sally Mckinnon, Pablo De Vera, Eugene Surdutovich, Susanna Guatelli, Andrei V. Korol, Anatoly Rosenfeld, Andrey V. Solov'yov

Faculty of Engineering and Information Sciences - Papers: Part A

The production of secondary electrons generated by carbon nanoparticles and pure water medium irradiated by fast protons is studied by means of model approaches and Monte Carlo simulations. It is demonstrated that due to a prominent collective response to an external field, the nanoparticles embedded in the medium enhance the yield of low-energy electrons. The maximal enhancement is observed for electrons in the energy range where plasmons, which are excited in the nanoparticles, play the dominant role. Electron yield from a solid carbon nanoparticle composed of fullerite, a crystalline form of C-60 fullerene, is demonstrated to be several times higher ...


The Bulk-Edge Correspondence For The Quantum Hall Effect In Kasparov Theory, Christopher J. Bourne, Alan L. Carey, Adam C. Rennie Jan 2015

The Bulk-Edge Correspondence For The Quantum Hall Effect In Kasparov Theory, Christopher J. Bourne, Alan L. Carey, Adam C. Rennie

Faculty of Engineering and Information Sciences - Papers: Part A

We prove the bulk-edge correspondence in K-theory for the quantum Hall effect by constructing an unbounded Kasparov module from a short exact sequence that links the bulk and boundary algebras. This approach allows us to represent bulk topological invariants explicitly as a Kasparov product of boundary invariants with the extension class linking the algebras. This paper focuses on the example of the discrete integer quantum Hall effect, though our general method potentially has much wider applications.


3d Printed Terahertz Diffraction Gratings And Lenses, A D. Squires, E Constable, R A. Lewis Jan 2015

3d Printed Terahertz Diffraction Gratings And Lenses, A D. Squires, E Constable, R A. Lewis

Faculty of Engineering and Information Sciences - Papers: Part A

3D printing opens up an inexpensive, rapid, and versatile path to the fabrication of optical elements suited to the terahertz regime. The transmission of the plastics used in 3D printers, while generally decreasing with frequency, is usable over the range 0.1-2 THz. We have designed, fabricated, and tested regular and blazed gratings and aspherical lenses for operation at terahertz frequencies. We find that the measured performance matches our theoretical predictions.


Characterization Of Smear Zone Caused By Mandrel Action, Buddhima Indraratna, Cholachat Rujikiatkamjorn, Made Ardana Jan 2015

Characterization Of Smear Zone Caused By Mandrel Action, Buddhima Indraratna, Cholachat Rujikiatkamjorn, Made Ardana

Faculty of Engineering and Information Sciences - Papers: Part A

In this study, the smear zone due to vertical drain installation is studied using a large, in situ sample to capture the realistic characteristics of the smear zone in relation to the in situ soil structure. The smear zone extent for Bulli clay (New South Wales, Australia) is quantified on the basis of normalised permeability and the reduction in the water content prior to consolidation. The permeability and compressibility of the soil are used to determine the extent to which the soil surrounding the PVD had become disturbed. In laboratory testing, the soil consolidation behavior due to a prefabricated vertical ...


Effects Of Salinity Build-Up On Biomass Characteristics And Trace Organic Chemical Removal: Implications On The Development Of High Retention Membrane Bioreactors, Wenhai Luo, Faisal I. Hai, Jinguo Kang, William E. Price, Wenshan Guo, Hao H. Ngo, Kazuo Yamamoto, Long D. Nghiem Jan 2015

Effects Of Salinity Build-Up On Biomass Characteristics And Trace Organic Chemical Removal: Implications On The Development Of High Retention Membrane Bioreactors, Wenhai Luo, Faisal I. Hai, Jinguo Kang, William E. Price, Wenshan Guo, Hao H. Ngo, Kazuo Yamamoto, Long D. Nghiem

Faculty of Engineering and Information Sciences - Papers: Part A

This study investigated the impact of salinity build-up on the performance of membrane bioreactor (MBR), specifically in terms of the removal and fate of trace organic chemicals (TrOCs), nutrient removal, and biomass characteristics. Stepwise increase of the influent salinity, simulating salinity build-up in high retention MBRs, adversely affected the metabolic activity in the bioreactor, thereby reducing organic and nutrient removal. The removal of hydrophilic TrOCs by MBR decreased due to salinity build-up. By contrast, with the exception of 17α-ethynylestradiol, the removal of all hydrophobic TrOCs was not affected at high salinity. Moreover, salinity build-up had negligible impact on the residual ...


Facilitating An Ant Colony Algorithm For Multi-Objective Data-Intensive Service Provisions, Lijuan Wang, Jun Shen, Junzhou Luo Jan 2015

Facilitating An Ant Colony Algorithm For Multi-Objective Data-Intensive Service Provisions, Lijuan Wang, Jun Shen, Junzhou Luo

Faculty of Engineering and Information Sciences - Papers: Part A

The explosion of enormous sources of digital data has led to greater dependence on data-intensive services. Applications based on data-intensive services have become one of the most challenging applications in cloud computing. The service provision, and in particular service composition, will face new challenges as the services and data grow. In this paper, we will evaluate an ant colony system to resolve the multi-objective data-intensive service composition problem. The algorithm for a multi-objective context will get a set of Pareto-optimal solutions considering two objectives at the same time: the total cost and the total execution time of a composite service.


Oxide Scale Characterization Of Ferritic Stainless Steel And Its Deformation And Friction In Hot Rolling, Xiawei Cheng, Zhengyi Jiang, Dongbin Wei, Liang Hao, Jingwei Zhao, Laizhu Jiang Jan 2015

Oxide Scale Characterization Of Ferritic Stainless Steel And Its Deformation And Friction In Hot Rolling, Xiawei Cheng, Zhengyi Jiang, Dongbin Wei, Liang Hao, Jingwei Zhao, Laizhu Jiang

Faculty of Engineering and Information Sciences - Papers: Part A

The oxidation kinetics of ferritic stainless steel 430 was studied in dry and humid air at 1090 °C by Thermo Gravimetric Analysis (TGA). Different atmospheres and heating times were adopted for reheating to obtain different compositions and thickness of the oxide scale. Hot rolling was performed on a 2-high Hille 100 experimental rolling mill at various reductions. Oxide scale thickness and composition were analysed with optical microscopy (OM), scanning electron microscope (SEM) and X-ray diffraction (XRD). The surface profiles were examined by a digital microscope, and the topographic features of the thin oxide scale surface were examined with an atomic ...


Crystal Plasticity Finite Element Method Modelling Of Indentation Size Effect, Mao Liu, Cheng Lu, A Kiet Tieu Jan 2015

Crystal Plasticity Finite Element Method Modelling Of Indentation Size Effect, Mao Liu, Cheng Lu, A Kiet Tieu

Faculty of Engineering and Information Sciences - Papers: Part A

A crystal plasticity finite element method (CPFEM) model has been developed to investigate the indentation size effect (ISE) of aluminium single crystal during nano-indentation. The simulated results have been validated by comparison with experimental observations. The load-hardness curves from simulation are consistent with the experimental results. The mathematic relationship between load and indentation depth has been built to investigate indentation size effect. In addition, the Mises stress, critical resolved shear stress, stress and shear strain rates for a selected element and the lattice curvature have been studied to explain indentation size effect.


Convexity Estimates For Surfaces Moving By Curvature Functions, Ben Andrews, Mat Langford, James A. Mccoy Jan 2015

Convexity Estimates For Surfaces Moving By Curvature Functions, Ben Andrews, Mat Langford, James A. Mccoy

Faculty of Engineering and Information Sciences - Papers: Part A

We consider the evolution of compact surfaces by fully nonlinear, parabolic curvature ows for which the normal speed is given by a smooth, degree one homogeneous function of the principal curvatures of the evolving surface. Under no further restrictions on the speed function, we prove that initial surfaces on which the speed is positive become weakly convex at a singularity of the flow. This generalises the corresponding result [26] of Huisken and Sinestrari for the mean curvature ow to the largest possible class of degree one homogeneous surface flows.


A Revisit Of Three Studies Related To Random Testing, Tsong Yueh Chen, Fei-Ching Kuo, Dave Towey, Zhiquan Zhou Jan 2015

A Revisit Of Three Studies Related To Random Testing, Tsong Yueh Chen, Fei-Ching Kuo, Dave Towey, Zhiquan Zhou

Faculty of Engineering and Information Sciences - Papers: Part A

© 2015 Science China Press and Springer-Verlag Berlin Heidelberg Software testing is an approach that ensures the quality of software through execution, with a goal being to reveal failures and other problems as quickly as possible. Test case selection is a fundamental issue in software testing, and has generated a large body of research, especially with regards to the effectiveness of random testing (RT), where test cases are randomly selected from the software’s input domain. In this paper, we revisit three of our previous studies. The first study investigated a sufficient condition for partition testing (PT) to outperform RT, and ...


Axial Compressive Behaviour Of Gfrp Tube Reinforced Concrete Columns, Muhammad N. S Hadi, Weiqiang Wang, M Neaz Sheikh Jan 2015

Axial Compressive Behaviour Of Gfrp Tube Reinforced Concrete Columns, Muhammad N. S Hadi, Weiqiang Wang, M Neaz Sheikh

Faculty of Engineering and Information Sciences - Papers: Part A

This paper presents an innovative reinforcing scheme for concrete columns using glass fibre reinforced polymer (GFRP) tubes. GFRP tubes (solid and perforated) have been placed into concrete columns to provide reinforcement in both longitudinal and transverse directions. In this study, 14 columns with 150 mm diameter and 300 mm height have been cast and tested under axial compression. The columns have been divided into seven groups; each group contains two columns. The first group of columns are the reference columns without any reinforcement. The other six groups of columns are reinforced with solid and perforated (axially and diagonally) GFRP tubes ...


3d-Mesa 'Bridge' Silicon Microdosimeter: Charge Collection Study And Application To Rbe Studies In 12c Radiation Therapy, Linh T. Tran, Lachlan Chartier, Dale A. Prokopovich, Mark I. Reinhard, Marco Petasecca, Susanna Guatelli, Michael L. F Lerch, Vladimir L. Perevertaylo, Marco Zaider, Naruhiro Matsufuji, Michael Jackson, Mitchell Nancarrow, Anatoly B. Rosenfeld Jan 2015

3d-Mesa 'Bridge' Silicon Microdosimeter: Charge Collection Study And Application To Rbe Studies In 12c Radiation Therapy, Linh T. Tran, Lachlan Chartier, Dale A. Prokopovich, Mark I. Reinhard, Marco Petasecca, Susanna Guatelli, Michael L. F Lerch, Vladimir L. Perevertaylo, Marco Zaider, Naruhiro Matsufuji, Michael Jackson, Mitchell Nancarrow, Anatoly B. Rosenfeld

Faculty of Engineering and Information Sciences - Papers: Part A

Microdosimetry is an extremely useful technique, used for dosimetry in unknown mixed radiation fields typical of space and aviation, as well as in hadron therapy. A new silicon microdosimeter with 3D sensitive volumes has been proposed to overcome the shortcomings of the conventional Tissue Equivalent Proportional Counter. In this article, the charge collection characteristics of a new 3D mesa microdosimeter were investigated using the ANSTO heavy ion microprobe utilizing 5.5 MeV rm He2 + and 2 MeV rm H + ions. Measurement of the microdosimetric characteristics allowed for the determination of the Relative Biological Effectiveness of the 12rm C heavy ...


Creativity Training Programs In The Uae Government Sector: Lessons From The Literature, Mardeya Al Balooshi, Payyazhi Jayashree, Scott Fargher Jan 2015

Creativity Training Programs In The Uae Government Sector: Lessons From The Literature, Mardeya Al Balooshi, Payyazhi Jayashree, Scott Fargher

Faculty of Engineering and Information Sciences - Papers: Part A

Creativity training has been recognized in literature as impacting divergent thinking capabilities as evidenced through varied indicators such as idea generation and innovation. This conceptual paper reviews literature on creativity training and examines its impact on organizational performance. Second, it examines the effectiveness of different tools that measure the impact of creativity training. This paper proposes that there is a need to customize measurement of creativity training instead of using generic models. The UAE public sector, focussing on the Dubai Government, forms the context for this paper as it has recently started investing heavily in creativity training programs as part ...


A New Bio-Cryptosystem-Oriented Security Analysis Framework And Implementation Of Multibiometric Cryptosystems Based On Decision Level Fusion, Cai Li, Jiankun Hu, Josef Pieprzyk, Willy Susilo Jan 2015

A New Bio-Cryptosystem-Oriented Security Analysis Framework And Implementation Of Multibiometric Cryptosystems Based On Decision Level Fusion, Cai Li, Jiankun Hu, Josef Pieprzyk, Willy Susilo

Faculty of Engineering and Information Sciences - Papers: Part A

Biometric cryptosystems provide an innovative solution for cryptographic key generation, encryption as well as biometric template protection. Besides high authentication accuracy, a good biometric cryptosystem is expected to protect biometric templates effectively, which requires that helper data does not reveal significant information about the templates. Previous works predominantly follow an appropriate entropy definition to measure the security of biometric cryptosystems. In this paper, we point out limitations of entropy-based security analysis and propose a new security analysis framework that combines information-theoretic approach with computational security. In addition, we construct a fingerprint-based multibiometric cryptosystem using decision level fusion. Hash functions are ...


Investigation Of X70 Line Pipe Steel Fracture During Single Edge-Notched Tensile Testing Using Acoustic Emission Monitoring, Turbadrakh Chuluunbat, Cheng Lu, Andrii Kostryzhev, A Kiet Tieu Jan 2015

Investigation Of X70 Line Pipe Steel Fracture During Single Edge-Notched Tensile Testing Using Acoustic Emission Monitoring, Turbadrakh Chuluunbat, Cheng Lu, Andrii Kostryzhev, A Kiet Tieu

Faculty of Engineering and Information Sciences - Papers: Part A

This paper presents an investigation of the fracture behavior of X70 pipeline steel using the acoustic emission (AE) monitoring technique. The AE monitoring technique is widely used in mechanical and materials research for detection of plastic deformation, fracture initiation and crack growth. However, quantitative dependences of the AE parameters (such as signal amplitude and frequency) on the fracture parameters of X70 pipeline steel (such as ductile and brittle fracture initiation and propagation) have not been studied in depth and are therefore not completely understood. In this paper, we report an investigation of the effect of loading conditions on the fracture ...


On Transformation Of Query Scheduling Strategies In Distributed And Heterogeneous Database Systems, Janusz R. Getta, - Handoko Jan 2015

On Transformation Of Query Scheduling Strategies In Distributed And Heterogeneous Database Systems, Janusz R. Getta, - Handoko

Faculty of Engineering and Information Sciences - Papers: Part A

This work considers a problem of optimal query processing in heterogeneous and distributed database systems. A global query sub- mitted at a local site is decomposed into a number of queries processed at the remote sites. The partial results returned by the queries are in- tegrated at a local site. The paper addresses a problem of an optimal scheduling of queries that minimizes time spend on data integration of the partial results into the final answer. A global data model defined in this work provides a unified view of the heterogeneous data structures located at the remote sites and a ...


Development Of A Predictive Framework To Assess The Removal Of Trace Organic Chemicals By Anaerobic Membrane Bioreactor, Kaushalya C. Wijekoon, James Mcdonald, Stuart J. Khan, Faisal I. Hai, William E. Price, Long D. Nghiem Jan 2015

Development Of A Predictive Framework To Assess The Removal Of Trace Organic Chemicals By Anaerobic Membrane Bioreactor, Kaushalya C. Wijekoon, James Mcdonald, Stuart J. Khan, Faisal I. Hai, William E. Price, Long D. Nghiem

Faculty of Engineering and Information Sciences - Papers: Part A

This study aims to develop a predictive framework to assess the removal and fate of trace organic chemicals (TrOCs) during wastewater treatment by anaerobic membrane bioreactor (AnMBR). The fate of 27 TrOCs in both the liquid and sludge phases during AnMBR treatment was systematically investigated. The results demonstrate a relationship between hydrophobicity and specific molecular features of TrOCs and their removal efficiency. These molecular features include the presence of electron withdrawing groups (EWGs) or donating groups (EDGs), especially those containing nitrogen and sulphur. All seven hydrophobic contaminants were well removed (>70%) by AnMBR treatment. Most hydrophilic TrOCs containing EDGs were ...


In Vivo Endorectal Dosimetry Of Prostate Tomotherapy Using Dual Moskin Detectors, Sarah J. Alnaghy, Shrikant Deshpande, Dean L. Cutajar, Kemal Berk, Peter Metcalfe, Anatoly B. Rosenfeld Jan 2015

In Vivo Endorectal Dosimetry Of Prostate Tomotherapy Using Dual Moskin Detectors, Sarah J. Alnaghy, Shrikant Deshpande, Dean L. Cutajar, Kemal Berk, Peter Metcalfe, Anatoly B. Rosenfeld

Faculty of Engineering and Information Sciences - Papers: Part A

Verification of dose to the anterior rectal wall in helical tomotherapy to the prostate is important due to the close proximity of the rectal wall to the treatment field. The steep dose gradient makes these measurements challenging. A phantom-based study was completed, aimed at developing a system for measurement of anterior rectal wall doses during hypofractionated prostate stereotactic body radiotherapy (SBRT) utilizing tomotherapy delivery. An array of four dual MOSkinTM dosimeters, spaced 1 cm apart, was placed on a replica Rectafix® immobilization spacer device. This Perspex probe is a more rigid alternative to rectal balloons, to improve geometric reproducibility. The ...


Brittle Versus Ductile Fracture Behaviour In Nanotwinned Fcc Crystals, Linqing Pei, Cheng Lu, A Kiet Tieu, Xing Zhao, Liang Zhang, Kuiyu Cheng, Guillaume Michal Jan 2015

Brittle Versus Ductile Fracture Behaviour In Nanotwinned Fcc Crystals, Linqing Pei, Cheng Lu, A Kiet Tieu, Xing Zhao, Liang Zhang, Kuiyu Cheng, Guillaume Michal

Faculty of Engineering and Information Sciences - Papers: Part A

Molecular dynamic simulation (MD) was used to study the brittle versus ductile fracture behaviour in nanotwinned Face Centred Cubic (FCC) crystals subjected to the uniaxial tensile deformation. A fundamental brittle versus ductile fracture is observed, which can be mainly understood in terms of the ratio of surface energy to unstable stacking fault energy or the ratio of ideal tensile strength to ideal shear strength in atomic model with a confined range of twinning spacing. Results show that the small ratio value is favourable for the brittle fracture, and vice versa, the big one supports the ductile fracture.


Hydrostatic Pressure Induced Transition From Δtc To Δℓ Pinning Mechanism In Mgb2, Babar Shabbir, Xiaolin Wang, Shaban Reza Ghorbani, S X. Dou, Feixiang Xiang Jan 2015

Hydrostatic Pressure Induced Transition From Δtc To Δℓ Pinning Mechanism In Mgb2, Babar Shabbir, Xiaolin Wang, Shaban Reza Ghorbani, S X. Dou, Feixiang Xiang

Faculty of Engineering and Information Sciences - Papers: Part A

The impact of hydrostatic pressure up to 1.2 GPa on the critical current density (Jc) and the nature of the pinning mechanism in MgB2 have been investigated within the framework of the collective theory. We found that the hydrostatic pressure can induce a transition from the regime where pinning is controlled by spatial variation in the critical transition temperature (δTc ) to the regime controlled by spatial variation in the mean free path (δℓ). Furthermore, critical temperature (Tc) and low field Jc are slightly reduced, although the Jc drops more quickly at high fields than at ambient pressure. We found ...


Grain Size Effect Of Thickness/Average Grain Size On Mechanical Behaviour, Fracture Mechanism And Constitutive Model For Phosphor Bronze Foil, Zhi Fang, Zhengyi Jiang, Xiaogang Wang, Cunlong Zhou, Dongbin Wei, Xianghua Liu Jan 2015

Grain Size Effect Of Thickness/Average Grain Size On Mechanical Behaviour, Fracture Mechanism And Constitutive Model For Phosphor Bronze Foil, Zhi Fang, Zhengyi Jiang, Xiaogang Wang, Cunlong Zhou, Dongbin Wei, Xianghua Liu

Faculty of Engineering and Information Sciences - Papers: Part A

Size effects play a significant role in microforming process, and any dimensional change can have a great impact on materials' mechanical properties. In this paper, the size effects on deformation behaviour and fracture of phosphor foil were investigated in the form of grain size effect: the ratio of materials' thickness (T) to average grain size (D) by micro tensile tests. The ratio was designed to be closed to but larger than, less than and equal to 1, respectively. The results show that the amount of plastic deformation decreases with the decrease of the ratio of T/D, which indicates that ...


Carbothermal Reduction Of Quartz In Methane-Hydrogen-Argon Gas Mixture, Xiang Li, Guangqing Zhang, Kai Tang, Oleg Ostrovski, Ragnar Tronstad Jan 2015

Carbothermal Reduction Of Quartz In Methane-Hydrogen-Argon Gas Mixture, Xiang Li, Guangqing Zhang, Kai Tang, Oleg Ostrovski, Ragnar Tronstad

Faculty of Engineering and Information Sciences - Papers: Part A

Synthesis of silicon carbide (SiC) by carbothermal reduction of quartz in a CH4-H2-Ar gas mixture was investigated in a laboratory fixed-bed reactor in the temperature range of 1573 K to 1823 K (1300 °C to 1550 °C). The reduction process was monitored by an infrared gas analyser, and the reduction products were characterized by LECO, XRD, and SEM. A mixture of quartz-graphite powders with C/SiO2 molar ratio of 2 was pressed into pellets and used for reduction experiments. The reduction was completed within 2 hours under the conditions of temperature at or above 1773 K (1500 °C), methane content ...


Quantum Ratchet In Two-Dimensional Semiconductors With Rashba Spin-Orbit Interaction, Yee Sin Ang, Zhongshui Ma, Chao Zhang Jan 2015

Quantum Ratchet In Two-Dimensional Semiconductors With Rashba Spin-Orbit Interaction, Yee Sin Ang, Zhongshui Ma, Chao Zhang

Faculty of Engineering and Information Sciences - Papers: Part A

Ratchet is a device that produces direct current of particles when driven by an unbiased force. We demonstrate a simple scattering quantum ratchet based on an asymmetrical quantum tunneling effect in two-dimensional electron gas with Rashba spin-orbit interaction (R2DEG). We consider the tunneling of electrons across a square potential barrier sandwiched by interface scattering potentials of unequal strengths on its either sides. It is found that while the intra-spin tunneling probabilities remain unchanged, the inter-spin-subband tunneling probabilities of electrons crossing the barrier in one direction is unequal to that of the opposite direction. Hence, when the system is driven by ...


Urinary Continence Care In Australian Nursing Homes, Ping Yu, Victoria Traynor, David Hailey Jan 2015

Urinary Continence Care In Australian Nursing Homes, Ping Yu, Victoria Traynor, David Hailey

Faculty of Engineering and Information Sciences - Papers: Part A

Objective Exploring urinary continence (UC) assessment and management practices in Australian nursing homes. Design Mixed method using a questionnaire and interviews. Setting Five nursing homes in Australian metropolitan cities. Subjects Participants 121 staff: mostly female (91%) with a range of roles including personal care assistants (PCAs) (63%), enrolled nurses (ENs) (11%), registered nurses (RNs) (20%) and managers (4%). Main outcomes measure(s) Compliance with and perceptions about UC assessment and management. Results 77% (n=71) of care staff (PCAs, ENs and RNs) were compliant with the UC management protocol of checking for wetness every 2 to 2.5 hours. Toileting ...


Efficient Algorithms For Secure Outsourcing Of Bilinear Pairings, Xiaofeng Chen, Willy Susilo, Jin Li, Duncan Wong, Jianfeng Ma, Shaohua Tang, Qiang Tang Jan 2015

Efficient Algorithms For Secure Outsourcing Of Bilinear Pairings, Xiaofeng Chen, Willy Susilo, Jin Li, Duncan Wong, Jianfeng Ma, Shaohua Tang, Qiang Tang

Faculty of Engineering and Information Sciences - Papers: Part A

The computation of bilinear pairings has been considered the most expensive operation in pairing-based cryptographic protocols. In this paper, we first propose an efficient and secure outsourcing algorithm for bilinear pairings in the two untrusted program model. Compared with the state-of-the-art algorithm, a distinguishing property of our proposed algorithm is that the (resource-constrained) outsourcer is not required to perform any expensive operations, such as point multiplications or exponentiations. Furthermore, we utilize this algorithm as a subroutine to achieve outsource-secure identity-based encryptions and signatures.


Coupled Discrete Element-Finite Difference Method For Analysing The Load-Deformation Behaviour Of A Single Stone Column In Soft Soil, Buddhima Indraratna, Ngoc Trung Ngo, Cholachat Rujikiatkamjorn, Scott W. Sloan Jan 2015

Coupled Discrete Element-Finite Difference Method For Analysing The Load-Deformation Behaviour Of A Single Stone Column In Soft Soil, Buddhima Indraratna, Ngoc Trung Ngo, Cholachat Rujikiatkamjorn, Scott W. Sloan

Faculty of Engineering and Information Sciences - Papers: Part A

Experimental studies and numerical modelling of the deformation of soft clay stabilised by stone columns have been conducted over the past few decades. Continuum-based numerical models have provided valuable insight into the prediction of settlement, lateral deformation, and stress and strain-rate dependent behaviour of stone columns at a macroscopic scale, but because they consist of granular material such as crushed rock, gravel, and waste rock aggregates, their behaviour is influenced by inter-particle micromechanics and cannot be modelled properly using these models. In this paper a novel coupled model of the discrete element method (DEM) and finite difference method (FDM) is ...


Chemical Cleaning Effects On Properties And Separation Efficiency Of An Ro Membrane, Kha L. Tu, Allan R. Chivas, Long D. Nghiem Jan 2015

Chemical Cleaning Effects On Properties And Separation Efficiency Of An Ro Membrane, Kha L. Tu, Allan R. Chivas, Long D. Nghiem

Faculty of Engineering and Information Sciences - Papers: Part A

This study aims to investigate the impacts of chemical cleaning on the performance of a reverse osmosis membrane. Chemicals used for simulating membrane cleaning include a surfactant (sodium dodecyl sulfate, SDS), a chelating agent (ethylenediaminetetraacetic acid, EDTA), and two proprietary cleaning formulations namely MC3 and MC11. The impact of sequential exposure to multiple membrane cleaning solutions was also examined. Water permeability and the rejection of boron and sodium were investigated under various water fluxes, temperatures and feedwater pH. Changes in the membrane performance were systematically explained based on the changes in the charge density, hydrophobicity and chemical structure of the ...


Field Investigation On Compaction And Strength Performance Of Two Coal Wash-Bos Slag Mixtures, S.M.Ali Tasalloti, Buddhima Indraratna, Gabriele Chiaro, Ana Heitor Jan 2015

Field Investigation On Compaction And Strength Performance Of Two Coal Wash-Bos Slag Mixtures, S.M.Ali Tasalloti, Buddhima Indraratna, Gabriele Chiaro, Ana Heitor

Faculty of Engineering and Information Sciences - Papers: Part A

The effective reuse and recycling of industrial byproducts, namely coal wash (CW) and basic oxygen steel slag (BOS), through large-scale geotechnical projects (e.g. land and port reclamation) is economically beneficial and environmentally sustainable. Nevertheless, due to the heterogeneity of these granular waste materials, the actual performance of compacted fill in the field can be significantly different from that observed in the laboratory. This paper reports the results of a compaction field trial carried out at Port Kembla Outer Harbor reclamation site (Wollongong, Australia) to evaluate the in situ performance of two selected CW-BOS blends. Based on a number of ...


Probing The Internal Structure Of Reverse Osmosis Membranes By Positron Annihilation Spectroscopy: Gaining More Insight Into The Transport Of Water And Small Solutes, Takahiro Fujioka, Nagayasu Oshima, Ryoichi Suzuki, William E. Price, Long D. Nghiem Jan 2015

Probing The Internal Structure Of Reverse Osmosis Membranes By Positron Annihilation Spectroscopy: Gaining More Insight Into The Transport Of Water And Small Solutes, Takahiro Fujioka, Nagayasu Oshima, Ryoichi Suzuki, William E. Price, Long D. Nghiem

Faculty of Engineering and Information Sciences - Papers: Part A

Reverse osmosis (RO) has been employed as a key separation process in many industrial applications. In recent years, the use of positron annihilation spectroscopy (PAS) including positron annihilation lifetime spectroscopy (PALS) and Doppler broadening of annihilation radiation to characterise the internal structure of the skin layer of thin film composite membranes has renewed research interest for further development and optimisation of the RO process. In this paper, we highlight the need for better understanding of the skin layer internal structure. We review relevant PAS techniques that could provide an unprecedented level of insight to our understanding of the internal structure ...