Social and Behavioral Sciences Commons^™

Effect Of Austenite Deformation Temperature On Nb Clustering And Precipitation In Microalloyed Steel, E V Pereloma, A G Kostryzhev, A Alshahrani, C Zhu, J M. Cairney, C R. Killmore, S P. Ringer

Faculty of Engineering and Information Sciences - Papers: Part A

The effect of thermomechanical processing conditions on Nb clustering and precipitation in both austenite and ferrite in a Nb-Ti microalloyed steel was studied using electron microscopy and atom probe tomography. A decrease in the deformation temperature increased the Nb-rich precipitation in austenite and decreased the extent of precipitation in ferrite. Microstructural mechanisms that explain this variation are discussed. 2013 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Effects Of Organic And Colloidal Fouling On The Rejection Of Two Pharmaceutically Active Compounds (Phacs) By Nanofiltration Processes: Role Of Membrane Foulants, Long D. Nghiem, Christiane Espendiller

Faculty of Engineering and Information Sciences - Papers: Part A

No abstract provided.

Toward Resource Recovery From Wastewater: Phosphorus Extraction From Digested Sludge Using Hybrid Forward Osmosis - Membrane Distillation Process, Ming Xie, Long D. Nghiem, William E. Price, Menachem Elimelech

Faculty of Engineering and Information Sciences - Papers: Part A

We demonstrate the simultaneous extraction of phosphorus and clean water from digested sludge centrate using a forward osmosis (FO)−membrane distillation (MD) hybrid process. In this FO−MD hybrid process, FO concentrates orthophosphate and ammonium for subsequent phosphorus recovery in the form of struvite (MgNH4PO4·6H2O), while MD is used to recover the draw solution and extract clean water from the digested sludge centrate. A decline in water flux was observed during the FO process, but fouling was largely reversible after a brief, simple membrane flushing using deionized water. The FO process also provides an effective pretreatment capacity to the subsequent MD process, …

A Sensitivity Analysis Toolkit For The Simplification Of Mv Distribution Network Voltage Management, Fabian Tamp, Philip Ciufo

Faculty of Engineering and Information Sciences - Papers: Part A

As distribution networks become increasingly variable and generation becomes increasingly decentralised, voltage standards are becoming more liable to violation. Accordingly, intelligent voltage management strategies are required to enable standards compliance without unduly increasing network maintenance or infrastructure costs. The relationship between network power and voltages, however, is complex, non-linear and interdependent, and thus is difficult to conceptualise and use for decision-making and control purposes. This paper introduces a software toolkit that simplifies the development of voltage management strategies by the application of sensitivity analysis. Sensitivity analysis reduces complex network relationships to simple linear equations, and thus enables easy and comprehensive …

Skew-Products Of Higher-Rank Graphs And Crossed Products By Semigroups, Benjamin Maloney, David Pask, Iain Raeburn

Faculty of Engineering and Information Sciences - Papers: Part A

We consider a free action of an Ore semigroup on a higher-rank graph, and the induced action by endomorphisms of the C ∗-algebra of the graph. We show that the crossed product by this action is stably isomorphic to the C ∗-algebra of a quotient graph. Our main tool is Laca’s dilation theory for endomorphic actions of Ore semigroups on C ∗-algebras, which embeds such an action in an automorphic action of the enveloping group on a larger C ∗-algebra.

The Primitive Ideals Of The Cuntz-Krieger Algebra Of A Row-Finite Higher-Rank Graph With No Sources, Toke Meier Carlsen, Sooran Kang, Jacob Shotwell, Aidan Sims

Faculty of Engineering and Information Sciences - Papers: Part A

We catalogue the primitive ideals of the Cuntz–Krieger algebra of a row-finite higher-rank graph with no sources. Each maximal tail in the vertex set has an abelian periodicity group of finite rank at most that of the graph; the primitive ideals in the Cuntz–Krieger algebra are indexed by pairs consisting of a maximal tail and a character of its periodicity group. The Cuntz–Krieger algebra is primitive if and only if the whole vertex set is a maximal tail and the graph is aperiodic.

An Approach For Online Assessment Of Rooftop Solar Pv Impacts On Low-Voltage Distribution Networks, Md Jan-E- Alam, Kashem Muttaqi, Darmawan Sutanto

Faculty of Engineering and Information Sciences - Papers: Part A

Assumption-based offline analysis tools may not be able to provide sufficient and accurate information for the corrective decision making to mitigate solar photovoltaic (PV) impacts in the future distribution grids. This is mainly due to the increasing penetration level of intermittent power generation resources and also the fluctuating behavior of consumer demand. Online assessment tools can assist to manage PV impacts and aid to mitigate those on a real-time basis. This paper proposes an approach for online assessment of rooftop PV impacts on low-voltage (LV) networks using real-time network data. A variable-width sliding window will be used to provide the …

Geometric Design Optimization For Dynamic Response Problem Of Continuous Reinforced Concrete Beams, Pezhman Sharafi, Muhammad Hadi, Lip H. Teh

Faculty of Engineering and Information Sciences - Papers: Part A

This paper presents a computer-aided design method for conceptual geometric layout optimization of multispan RC beams for any type of dynamic responses. A key feature of the paper is the development of a new cost-optimization method for geometric layout problems that take both cost parameters and dynamic responses into account to achieve an optimum design along with acceptable dynamic performance of RC beams. This method takes advantage of employing a new optimization formulation that considerably simplifies the preliminary layout design computations. It focuses on minimizing the structural cost subject to constraints on eigenfrequencies, modal shapes, and the static and dynamic …

A Revised Attack On Computational Ontology, Nir Fresco, Phillip J. Staines

Faculty of Engineering and Information Sciences - Papers: Part A

There has been an ongoing conflict regarding whether reality is fundamentally digital or analogue. Recently, Floridi has argued that this dichotomy is misapplied. For any attempt to analyse noumenal reality independently of any level of abstraction at which the analysis is conducted is mistaken. In the pars destruens of this paper, we argue that Floridi does not establish that it is only levels of abstraction that are analogue or digital, rather than noumenal reality. In the pars construens of this paper, we reject a classification of noumenal reality as a deterministic discrete computational system. We show, based on considerations from …

A Validated Thermo Mechanical Fem Model Of Bead-On-Plate Welding, Djarot Darmadi, A Kiet Tieu, John Norrish

Faculty of Engineering and Information Sciences - Papers: Part A

This paper is presenting accurate FEM model of bead-on-plate welds of 316L stainless steels through thermo-mechanical analysis. The model was composed using ANSYS Parametric Design Language (APDL) program. In thermal analysis, mixed mode of volumetric thermal load was used to represent moving heat source. Growing weld bead was accommodated in both the thermal and mechanical models using birth and death technique. Melting phenomenon was modelled by low stiffness and zero plastic strain of melting elements. Results from thermal analysis and subsequent mechanical analysis have been validated. Good agreements of predicted temperature histories, temperature field and residual stress with experimental results …

A Review Of Microfabrication Techniques And Dielectrophoretic Microdevices For Particle Manipulation And Separation, Ming Li, Weihua Li, Jun Zhang, Gursel Alici, Weijia Wen

Faculty of Engineering and Information Sciences - Papers: Part A

The development of lab-On-A-Chip (LOC) devices over the past decade has attracted growing interest. LOC devices aim to achieve the miniaturization, integration, automation and parallelization of biological and chemical assays. One of the applications, the ability to effectively and accurately manipulate and separate micro- and nano-scale particles in an aqueous solution, is particularly appealing in biological, chemical and medical fields. Among the technologies that have been developed and implemented in microfluidic microsystems for particle manipulation and separation (such as mechanical, inertial, hydrodynamic, acoustic, optical, magnetic and electrical methodologies), dielectrophoresis (DEP) may prove to be the most popular because of its …

Water Reclamation From Shale Gas Drilling Flow-Back Fluid Using A Novel Forward Osmosis-Vacuum Membrane Distillation Hybrid System, Xue-Mei Li, Baolong Zhao, Zhongwei Wang, Ming Xie, Jianfeng Song, Long Nghiem, Tao He, Chi Yang, Chunxia Li, Ghang Chen

Faculty of Engineering and Information Sciences - Papers: Part A

This study examined the performance of a novel hybrid system of forward osmosis (FO) combined with vacuum membrane distillation (VMD) for reclaiming water from shale gas drilling flow-back fluid (SGDF). In the hybrid FO-VMD system, water permeated through the FO membrane into a draw solution reservoir, and the VMD process was used for draw solute recovery and clean water production. Using a SGDF sample obtained from a drilling site in China, the hybrid system could achieve almost 90% water recovery. Quality of the reclaimed water was comparable to that of bottled water. In the hybrid FO-VMD system, FO functions as …

The Prediction Of Turbulence Intensities In Unsteady Flow, Ishraq Alfadhli, Shu-Qing Yang, Muttucumaru Sivakumar

Faculty of Engineering and Information Sciences - Papers: Part A

This study investigates the distribution of turbulence intensities in unsteady non-uniform flows. Yang & Chow's (2008) work was extended to express this distribution based on the relationship between Reynolds shear stress and turbulence intensities in unsteady flow. It was found a self-similarity relationship between Reynolds shear stress and turbulence intensities in unsteady flow. This relationship has been developed as empirical equations based on experimental data available in the literature. By applying the self-similarity relationship, good agreements between the measured and predicted turbulence intensities have been achieved.

Sodium Hydroxide Production From Sodium Carbonate And Bicarbonate Solutions Using Membrane Electrolysis: A Feasibility Study, Alexander R. Simon, Takahiro Fujioka, William Price, Long Nghiem

Faculty of Engineering and Information Sciences - Papers: Part A

This study demonstrates the feasibility of producing NaOH from coal seam gas (CSG) brine by membrane electrolysis.

Absolute Phase Map Recovery Of Two Fringe Patterns With Flexible Selection Of Fringe Wavelengths, Jiale Long, Jiangtao Xi, Ming Zhu, Wenqing Cheng, Rui Cheng, Zhongwei Li, Yusheng Shi

Faculty of Engineering and Information Sciences - Papers: Part A

A novel approach is proposed to unwrap the phase maps of two fringe patterns in fringe pattern projection-based profilometry. In contrast to existing techniques, where spatial frequencies (i.e., the number of fringes on a pattern) of the two fringe patterns must be integers and coprime, the proposed method is applicable for any two fringe patterns with different fringe wavelengths (i.e., the number of pixels in a fringe) and thus provides more flexibility in the use of fringe patterns. Moreover, compared to the existing techniques, the proposed method is simpler in its implementation and has better antierror capability. Theoretical analysis and …

Optimal Transportation On The Hemisphere, Sun-Yung Alice Chang, Jiakun Liu, Paul Yang

Faculty of Engineering and Information Sciences - Papers: Part A

In this paper, we study the optimal transportation on the hemisphere, with the cost function c(x, y) = 1/2d2 (x, y), where d is the Riemannian distance of the round sphere. The potential function satisfies a Monge-Ampere type equation with natural boundary condtion. In this critical case, the hemisphere does not satisfy the c-convexity assumption. We obtain the priori oblique derivate estimate, and in the special case of two demensional hemisphere, we obtain the boundary C2 estimate. Our proof does not require the smoothness of densities.

Shuttle Car Network For Roadway Development, Dalin Cai, Ernest Baafi, Ian Porter

Faculty of Engineering and Information Sciences - Papers: Part A

Australian underground coal mines predominately use the longwill method for coal extraction. In longwall mining at least two parallel roadways known as gateroads are mined to delineate the sides of the longwall block, a longwall installation face is then driven connecting the gatheroads to enable the longwall mining equipment to be installed. Roadway development should ideally be ahead of the longwall so that the longwall equipment can be installed into the newly developed panel with minimal delay to coal production. A discrete event mode of roadway development can help asses how a particular configuration may perform with high levels of …

Control Of Conducting Polymer Actuators Without Physical Feedback: Simulated Feedback Control Approach With Particle Swarm Optimization, Xingcan Xiang, Rahim Mutlu, Gursel Alici, Weihua Li

Faculty of Engineering and Information Sciences - Papers: Part A

Conducting polymer actuators have shown significant potential in articulating micro instruments, manipulation devices, and robotics. However, implementing a feedback control strategy to enhance their positioning ability and accuracy in any application requires a feedback sensor, which is extremely large in size compared to the size of the actuators. Therefore, this paper proposes a new sensorless control scheme without the use of a position feedback sensor. With the help of the system identification technique and particle swarm optimization, the control scheme, which we call the simulated feedback control system, showed a satisfactory command tracking performance for the conducting polymer actuator's step …

Modelling Variations In Hospital Service Delivery Based On Real Time Locating Information, Nagesh Shukla, John Keast, Darek Ceglarek

Faculty of Engineering and Information Sciences - Papers: Part A

Variations in service delivery have been identified as a major challenge to the success of process improvement studies in service departments of hospital such as radiology. Largely, these variations are due to inherent system level factors, i.e., system variations such as unavailability of resources (nurse, bed, doctors, and equipment). These system variations are largely unnecessary/unwarranted and mostly lead to longer waiting times, delays, and lowered productivity of the service units. There is limited research on identifying system variations and modelling them for service improvements within hospital. Therefore, this paper proposes a modelling methodology to model system variations in radiology based …

Efficient Semi-Static Secure Broadcast Encryption Scheme, Jongkil Kim, Willy Susilo, Man Ho Allen Au, Jennifer Seberry

Faculty of Engineering and Information Sciences - Papers: Part A

In this paper, we propose a semi-static secure broadcast encryption scheme with constant-sized private keys and ciphertexts. Our result improves the semi-static secure broadcast encryption scheme introduced by Gentry and Waters. Specifically, we reduce the private key and ciphertext size by half. By applying the generic transformation proposed by Gentry and Waters, our scheme also achieves adaptive security. Finally, we present an improved implementation idea which can reduce the ciphertext size in the aforementioned generic transformation.

Non-Parametric Radially Symmetric Mean Curvature Flow With A Free Boundary, V.-M Wheeler

Faculty of Engineering and Information Sciences - Papers: Part A

We study the mean curvature flow of radially symmetric graphs with prescribed contact angle on a fixed, smooth hypersurface in Euclidean space. In this paper we treat two distinct problems. The first problem has a free Neumann boundary only, while the second has two disjoint boundaries, a free Neumann boundary and a fixed Dirichlet height. We separate the two problems and prove that under certain initial conditions we have either long time existence followed by convergence to a minimal surface, or finite maximal time of existence at the end of which the graphs develop a curvature singularity. We also give …

Aspects Related To The Small Strain Shear Modulus Behaviour Of Compacted Soils Subjected To Wetting And Drying, Ana Heitor, Buddhima Indraratna, Cholachat Rujikiatkamjorn

Faculty of Engineering and Information Sciences - Papers: Part A

The dynamic properties of a soil are routinely investigated to describe its engineering behavior under repeated loading. Although the effect of suction on the dynamic response of soils is significant, there have been limited studies in which the post-compacted changes in suction induced by wetting and drying cycles have been considered. In this paper, aspects related to the dynamic properties with special reference to the small strain shear modulus of compacted soils subjected to wetting and drying are described. Further evidence on the dynamic response in terms of small strain shear modulus (G0) of a compacted soil subjected to wetting-drying …

An Mle Method For Finding Lkb Ntcp Model Parameters Using Monte Carlo Uncertainty Estimates, Martin Carolan, Bradley Oborn, Kerwyn Foo, Annette Haworth, Sarah Gulliford, Martin A. Ebert

Faculty of Engineering and Information Sciences - Papers: Part A

The aims of this work were to establish a program to fit NTCP models to clinical data with multiple toxicity endpoints, to test the method using a realistic test dataset, to compare three methods for estimating confidence intervals for the fitted parameters and to characterise the speed and performance of the program.

Inertial Particle Separation By Differential Equilibrium Positions In A Symmetrical Serpentine Micro-Channel, Jun Zhang, Sheng Yan, Ronald Sluyter, Weihua Li, Gursel Alici, Nam-Trung Nguyen

Faculty of Engineering and Information Sciences - Papers: Part A

This paper presents an inertial microfluidic device with a simple serpentine micro-channel to continuously separate particles with high performance. Separation of micro/nano-particles has a variety of potential applications in biomedicine and industry. Among the existing separation technologies, a label-free technique without the use of antibody affinity, filter or centrifugation is highly desired to ensure minimal damage and alteration to the cells. Inertial microfluidics utilising hydrodynamic forces to separate particles is one of the most suitable label-free technologies with a high throughput. Our separation concept relies on size-based differential equilibrium positions of the particles perpendicular to the flow. Highly efficient separation …

Tuning Houses Through Building Management Systems, Jose Ripper Kos, Massimo Fiorentini, Paul Cooper, Felipe Miranda

Faculty of Engineering and Information Sciences - Papers: Part A

This paper departs from an analogy of sailing race instruments to demonstrate the potential of automation systems on the house performance and, more important, on impacting households for a more sustainable behavior. Sailing instruments have positively influenced the results on experienced sailors' speed and ultimately have confirmed their observations on nature cycles. We have presented two research projects for the development of Building Management Systems for a house that relies mostly on natural ventilation and thermal mass and another one, based on a complex conditioning system with a solar assited HVAC system, connected to a Phase Change Material thermal storage. …

Effect Of Holding Temperature And Time On Ferrite Formation In Dual Phase Steel Produced By Strip Casting, Zhiping Xiong, Andrii Kostryzhev, Nicole Stanford, Elena V. Pereloma

Faculty of Engineering and Information Sciences - Papers: Part A

Conventional dual phase (DP) steel (0.08C-0.81Si-1.47Mn-0.03Al, wt. %) was manufactured by the laboratory simulation of strip casting. The effect of holding temperature and time on microstructure evolution was studied using a quench-deformation dilatometer. Microstructures were observed using optical and scanning electron microscopy. The results showed that the nose temperature of ferrite phase field is around 650 °C. The kinetics of ferrite formation is fast within the first 100 s of holding at this temperature, and then formation of ferrite continues at a slower rate until it reaches the fraction corresponding to that defined by the lever rule. 70~80 % ferrite …

Simplicity Of Algebras Associated To Étale Groupoids, Jonathan Brown, Lisa Orloff Clark, Cynthia Farthing, Aidan Sims

Faculty of Engineering and Information Sciences - Papers: Part A

We prove that the full C*-algebra of a second-countable, Hausdorff, etale, amenable groupoid is simple if and only if the groupoid is both topologically principal and minimal. We also show that if G has totally disconnected unit space, then the complex *-algebra of its inverse semigroup of compact open bisections, as introduced by Steinberg, is simple if and only if G is both effective and minimal.

Microstructure And Mechanical Properties Of Aa5005/Aa6061 Laminated Composite Processed By Accumulative Roll Bonding, Lihong Su, Cheng Lu, Guanyu Deng, A Kiet Tieu

Faculty of Engineering and Information Sciences - Papers: Part A

ULTRAFINE-GRAINED (UFG) materials have been gathering much interest for the last two decades as the materials have extraordinary mechanical properties such as high strength, low temperature superplastisity, and high corrosion resistance. Severe plastic deformation (SPD) is the most widely used method to produce UFG materials. Accumulative roll bonding (ARB) has become one of the most important SPD techniques since it was first introduced by Saito et al.[1] As the same equipment as in conventional rolling is used, ARB is considered to be one of the most promising methods for manufacturing UFG sheet materials.

Too Many Loads On Our Roads When Rail Is The Answer, Philip Laird

Faculty of Engineering and Information Sciences - Papers: Part A

“Without trucks, Australia stops” is now a fact of modern life. But when all costs are considered, road freight is an expensive way of moving large amounts of freight. And, as shown by ongoing fatal crashes involving large trucks, road freight can also be dangerous.

The main beneficiaries of road freight are not the truck drivers who work hard in a dangerous occupation, but the companies that choose to consign large quantities of freight by road. Road freight has seen strong growth, in part, due to good service levels and major road improvements that include highways with dual carriageways and …

Optimal Design Of Semi Active Control For Adjacent Buildings Connected By Mr Damper Based On Integrated Fuzzy Logic And Multi-Objective Genetic Algorithm, Mehmet Uz, Muhammad N. S Hadi

Faculty of Engineering and Information Sciences - Papers: Part A

An optimal design strategy based on genetic algorithms (GA) is proposed for nonlinear hysteretic control devices that prevent pounding damage and achieve the best results in seismic response mitigation of two adjacent structures. An integrated fuzzy controller is used in order to provide the interactive relationships between damper forces and input voltages for MR dampers based on the modified Bouc-Wen model. Furthermore, Linear Quadratic Regulator (LQR) and H2/LQG (Linear Quadratic Gaussian) controllers based on clipped voltage law (CVL) are also used to compare the results obtained by fuzzy controller. This study employs the main objectives of the optimal design that …