Engineering Commons^™

Comparison Of The Mineralogy Of Iron Ore Sinters Using A Range Of Techniques, Tom Honeyands, James Manuel, Leanne Matthews, Damien O'Dea, David J. Pinson, J Leedham, Guangqing Zhang, Huibin Li, Brian J. Monaghan, Xinliang Liu, Eugene Donskoi, Nathan A.S. Webster, Mark Pownceby

Faculty of Engineering and Information Sciences - Papers: Part B

Many different approaches have been used in the past to characterise iron ore sinter mineralogy to predict sinter quality and elucidate the impacts of iron ore characteristics and process variables on the mechanisms of sintering. This paper compares the mineralogy of three sinter samples with binary basicities (mass ratio of CaO/SiO₂) between 1.7 and 2.0. The measurement techniques used were optical image analysis and point counting (PC), quantitative X‐ray diffraction (QXRD) and two different scanning electron microscopy systems, namely, Quantitative Evaluation of Materials by Scanning Electron Microscopy (QEMSCAN) and TESCAN Integrated Mineral Analyser (TIMA). Each technique has its …

A 7r Spatial Linkage For Ankle Rehabilitation With An Arbitrary Ankle Rotation Axis, Chih-Ching Hsieh, Chin-Hsing Kuo, Daisuke Matsuura, Yukio Takeda

Faculty of Engineering and Information Sciences - Papers: Part B

In this paper, a 7R spatial linkage for ankle rehabilitation was proposed. Thanks to its kinematic geometry, the output joint, which is accommodated by the patient's ankle, of the linkage can possess an arbitrary joint axis at any configuration. This advantage allows the patient achieving a flexible ankle motion in 3-D space while performing the rehabilitation exercise. The design concept of the 7R linkage is explained, and the displacement and force relationships between the input and output joints (i.e., the motor and patient's ankle) are analyzed through an equivalent RSSR linkage. A prototype is built to validate the proposed design …

Coupled Cfd-Dem Modelling Of Mine Dust Dispersion In Underground Roadway, Lihai Tan, Ting X. Ren

Faculty of Engineering and Information Sciences - Papers: Part B

Dust particles floating inside roadways are characterized by various sizes. However, it is difficult to replicate the dust environment with such factors taken into consideration in laboratory experiments. Fortunately, computational technology provides an alternative way for that. In this study, in order to investigate the movement mechanism of dust with different diameters from heading face in the underground roadway, a three-dimensional CFD-DEM coupling numerical model is presented using the Eulerian-Lagrangian method. A numerical roadway model based on a practical engineering case has been established for the purpose of studying the dust diffusion under single-forced ventilation condition in roadway underground. The …

A Survey On What Australians With Upper Limb Difference Want In A Prosthesis: Justification For Using Soft Robotics And Additive Manufacturing For Customized Prosthetic Hands, Benjamin Stephens-Fripp, Mary Jean Walker, Eliza Goddard, Gursel Alici

Faculty of Engineering and Information Sciences - Papers: Part B

Purpose: Upper limb prostheses are part of a rapidly changing market place. Despite development in device design, surveys report low levels of uptake and dissatisfaction with current prosthetic design. In this study, we present the results of a survey conducted with people with upper limb difference in Australia on their use of current prostheses and preferences in a prosthetic in order to inform future prosthetic hand design.

Methods: An online survey was conducted on upper limb amputees, with 27 respondents that completed the survey. The survey was a mixture of open-ended questions, ranking design features and quantitative questions …

Effect Of Temperature And Strain Rate On The Hot Deformation Behaviour Of Ferritic Stainless Steel, Guoqing Zu, Yukuan Lu, Yi Yan, Xiaoming Zhang, Jingwei Zhao, Wei Du, Xu Ran, Zhengyi Jiang

Faculty of Engineering and Information Sciences - Papers: Part B

The flow behaviour and microstructure characteristics of a ferritic stainless steel were investigated using plain strain compression test on a Gleeble 3500 thermo-mechanical test simulator with a hydrawedge system in the temperature range of 850-1100 °C and strain rate range of 0.1-50 s⁻¹. The phenomenological constitutive model and the relationship between the Zener-Hollomon (Z) parameter and flow stress were established. The results reveal that the flow softening phenomenon occurs at high strain rate, which is caused by the coupling effect of the adiabatic heating and dynamic recrystallisation (DRX). New grains nucleate preferentially at the original grain boundaries by …

Effects Of Ni And Cr On Cryogenic Impact Toughness Of Bainite/Martensite Multiphase Steels, Zishan Yao, Guang Xu, Zhengyi Jiang, Junyu Tian, Qing Yuan, Hongwei Ma

Faculty of Engineering and Information Sciences - Papers: Part B

In the present research, the effects of Nickel (Ni) and Chromium (Cr) on cryogenic impact toughness (CIT) of low-carbon bainite/martensite multiphase steels [processed by two different cooling processes: isothermal transformation process (ITP) and continuous cooling process (CCP)] were investigated. It was found that due to the formation of carbides during isothermal treatment, the addition of Ni and Cr yielded no significant improvements in CIT. However, during CCP treatment, the addition of Ni manifested a considerable enhancement in CIT, whereas the addition of both Ni and Cr caused a decrease in CIT. Further, after ITP treatment, the microstructure of all steels …

Experimental Investigation On The Mechanical And Tribological Coupled Behaviour Of Bimetal Composite Under Different States, Zhou Li, Jingwei Zhao, Hui Wu, Fanghui Jia, Ye Yao, Qingfeng Zhang, Sihai Jiao, Zhengyi Jiang

Faculty of Engineering and Information Sciences - Papers: Part B

Wear resistance and excellent mechanical properties are the main requirements in industrial applications of bimetal composites. The interfacial evolution of duplex stainless steel/low carbon steel (2205/AH36) bimetal composite after annealing and its tribological behaviour in a 3.5 wt% NaCl solution were investigated in this study. The bonding interface evolution between two layers plays a critical role in mechanical properties of composite, and the surface microstructure of stainless steel layer determines the wear and corrosion resistance. The hot-rolled composite samples were heat treated at temperatures ranging from 850 to 1150 °C in steps of 100 °C for 1 h. Optical microscopy …

Experimental Characterization Of Wildfire Sprinkler Sprays Using High-Speed Videography, Alan Green, Paul Cooper

Faculty of Engineering and Information Sciences - Papers: Part B

External sprinkler systems are one of a relatively small number of measures that are frequently recommended for the protection of houses from wildfires. However, very little scientific work appears to have been undertaken to evaluate their effectiveness. Numerical simulation techniques such as computational fluid dynamics (CFD) could be used to investigate spray performance in the conditions of a wildfire; however, detailed characteristics of the sprays typically implemented in wildfire sprinkler systems must first be known so that they can be accurately represented in such simulations. This paper presents the results of an in-depth experimental investigation into the spatiotemporal distributions of …

Optimum Mix Design Of Geopolymer Pastes And Concretes Cured In Ambient Condition Based On Compressive Strength, Setting Time And Workability, Muhammad N. S Hadi, Haiqiu Zhang, Shelley Parkinson

Faculty of Engineering and Information Sciences - Papers: Part B

In this study, the effects of ground granulated blast furnace slag (GGBFS) content, alkaline solution to binder (Al/Bi) mass ratio, sodium silicate solution to sodium hydroxide solution (SS/SH) mass ratio, and additional water to binder (Aw/Bi) mass ratio on the compressive strength, setting time and workability of geopolymer pastes were studied. A series of mini-size specimen compression tests, setting time tests and mini-slump tests were conducted at ambient condition (23 ± 2 °C). The GGBFS and Class F fly ash (FA) were used as aluminosilicate source. The alkaline activator was a blend of sodium silicate solution and sodium hydroxide solution. …

Geogrid-Confined Pervious Geopolymer Concrete Piles With Frp-Pvcconfined Concrete Core: Concept And Behaviour, Haiqiu Zhang, Muhammad N. S Hadi

Faculty of Engineering and Information Sciences - Papers: Part B

The use of fibre reinforced polymer (FRP) and polyvinyl chloride (PVC) as strengthening materials for piles was found to be a promising scheme, due to their high strength-to-weight ratio, high durability and high anti-corrosion ability. This study presents an experimental investigation of a new form of composite piles: geogrid-confined pervious geopolymer concrete piles (GPGCPs) with fibre reinforced polymer (FRP)-polyvinyl chloride (PVC)-confined concrete core (FPCC). The GPGCP with FPCC consists of a circular geogrid outer tube, a FRP-PVC-confined normal geopolymer concrete core, and pervious geopolymer concrete (PGC) filled in between. The reason for applying PGC into piles is to increase the …

Authorized Equality Test On Identity-Based Ciphertexts For Secret Data Sharing Via Cloud Storage, Hongbo Li, Qiong Huang, Sha Ma, Jian Shen, Willy Susilo

Faculty of Engineering and Information Sciences - Papers: Part B

With the higher rate of using cloud storage, protecting data privacy becomes an important issue. The most effective solution is to encrypt data before uploading to the cloud. However, how to efficiently search over data encrypted with different keys is still an open problem. To address this problem, we introduce a new notion of the identity-based encryption with equality test supporting flexible authorization (IBEET-FA). It supports the test of whether two ciphertexts encrypted under the different keys encapsulate the same message, and in the meanwhile supports fine-grained authorization of the test. Based on the equality test on ciphertexts, there is …

On The Cauchy Problem For Stochastic Parabolic Equations In Holder Spaces, Kai Du, Jiakun Liu

Faculty of Engineering and Information Sciences - Papers: Part B

In this paper, we establish a sharp $ C^{2+\alpha }$-theory for stochastic partial differential equations of parabolic type in the whole space.

Three-Dimensional Measurement With Reflection Suppression Based On High-Dynamic Range Images, Limei Song, Yuan Ru, Yangang Yang, Qinghua Guo, Xinjun Zhu, Jiangtao Xi

Faculty of Engineering and Information Sciences - Papers: Part B

To deal with the three-dimensional (3-D) point cloud loss caused by object reflection in the active fringe projection 3-D measurement, an active reflection suppression method for 3-D measurement is proposed. The method employs high-dynamic range images obtained by multiple exposure image fusion and a three-wavelength phase-shift profilometry method to achieve high-precision 3-D measurement of reflective objects. Experimental results show that, compared to traditional 3-D measurement methods, the proposed one can more effectively handle reflections thereby avoiding 3-D point cloud loss in the measurement of reflective objects.

Characterization Of Amorphous Magnetic Materials Under High-Frequency Non-Sinusoidal Excitations, Md. Ashib Rahman, Md Rabiul Islam, Kashem M. Muttaqi, Danny Sutanto

Faculty of Engineering and Information Sciences - Papers: Part B

In power electronic based energy conversion, the high-frequency transformer (HFT) is usually excited with a high-frequency (HF) square wave voltage generated from a power electronic converter circuit (PEC). A PEC needs a reasonable dead-band (DB) and the inclusion of the DB changes the shape of the square wave. In this paper, for the characterization of the core, the DB is varied to produce different non-sinusoidal excitation voltages and an optimized excitation voltage is identified. The effect of the DB on the hysteresis loop of the HFT is also demonstrated. The mathematical analysis shows that the inclusion of the DB causes …

Towards Multi-User Searchable Encryption Supporting Boolean Query And Fast Decryption, Yunling Wang, Jianfeng Wang, Shi Sun, Joseph K. Liu, Willy Susilo, Joon Sang Baek, Ilsun You, Xiaofeng Chen

Faculty of Engineering and Information Sciences - Papers: Part B

Searchable encryption enables the data owner to outsource their data to the cloud server while retaining the search ability. Recently, some researchers proposed a variant of searchable encryption, named single-writer/multi-reader searchable encryption (SMSE), in which any authorized data user can perform a search query. That is, each document identifier is encrypted using attribute-based encryption (ABE), such that an arbitrary authorized user whose attributes match the corresponding access policy can access the document. However, the cloud server cannot determine whether the user has the ability to decrypt the matched data. Thus, it has to response all the search results to the …

Experimental Investigation And Modeling Of The Transformation Of Illicit Drugs In A Pilot-Scale Sewer System, Jiaying Li, Jianfa Gao, Phong K. Thai, Adam Shypanski, Ludwika Nieradzik, Jochen F. Mueller, Zhiguo Yuan, Guangming Jiang

Faculty of Engineering and Information Sciences - Papers: Part B

In-sewer stability of illicit drug biomarkers has been evaluated by several reactor-based studies, but less has beendone in sewer pipes. Experiments conducted in sewer pipes have advantages over lab-scale reactors in providing more realisticbiomarker stability due to theflow and biological dynamics. This study assessed the transportation and transformation of sevenillicit drug biomarker compounds in a pilot-scale rising main and a gravity sewer pipe. Biomarkers presented diverse stabilitypatterns in the pilot sewers, based on which a drug transformation model was calibrated. This model was subsequently validatedusing transformation data sets from the literature, aiming to demonstrate the predictability of the pilot-based transformationcoefficients …

Pricing European Call Options Under A Hard-To-Borrow Stock Model, Guiyuan Ma, Song-Ping Zhu, Wenting Chen

Faculty of Engineering and Information Sciences - Papers: Part B

This paper studies European call option pricing problem under a hard-to-borrow stock model where stock price and buy-in rate are fully coupled. Avellaneda and Lipkin (2009) proposed a simplified solution approach with an independence assumption, and then derived a semi-explicit pricing formula. However, such an approach has limited its application to more general cases. In this paper, we propose a partial differential equation (PDE) approach for pricing European call options, regardless of the independence assumption. A two-dimensional PDE is derived first with a set of appropriate boundary conditions. Then, two numerical schemes are provided with different treatments of the jump …

Investigation Of The Consequence Of High-Pressure Co 2 Pipeline Failure Through Experimental And Numerical Studies, Xiong Liu, Ajit R. Godbole, Cheng Lu, Guillaume Michal, Valerie M. Linton

Faculty of Engineering and Information Sciences - Papers: Part B

Transportation of Carbon Dioxide (CO 2 ) via high-pressure pipelines from source to storage site forms an important link in the Carbon Capture and Storage (CCS)chain. To ensure the safety of the operation, it is necessary to develop a comprehensive understanding of the consequences of possible pipeline failure. CO 2 is a hazardous substance and an accidental release may lead to catastrophic damage. This paper describes an experimental investigation of the dispersion of CO 2 in the atmosphere in a full-scale burst test of a pipeline containing high-pressure dense phase CO 2 . The experiment was carried out to simulate …

Local-Global Interaction Buckling Of Square High Strength Concrete-Filled Double Steel Tubular Slender Beam-Columns, Mizen Ahmed, Qing Quan Liang, Vipulkumar I. Patel, Muhammad N. S Hadi

Faculty of Engineering and Information Sciences - Papers: Part B

High-strength square concrete-filled double steel tubular (CFDST) slender beam-columns with a circular internal steel tube subjected to eccentric loads may undergo interaction local-global buckling. No computational studies on the interaction local-global buckling of slender square CFDST beam-columns have been reported and their behavior has not been fully understood. This paper describes a mathematical model for the simulation of the interaction local-global buckling behavior of square high-strength CFDST slender beam-columns under axial compression in combination with uniaxial bending. The mathematical model is formulated by the fiber approach, accounting for confinement provided by the internal circular steel tube, and geometric and material …

High Spatial Resolution Scintillator Dosimetry Of Synchrotron Microbeams, James Archer, Enbang Li, Jeremy A. Davis, Matthew Cameron, Anatoly B. Rosenfeld, Michael L. F Lerch

Faculty of Engineering and Information Sciences - Papers: Part B

No abstract provided.

Frequency Domain Characterization And Performance Bounds Of Alms Loop For Rf Self-Interference Cancellation, Anh Tuyen Le, Le Chung Tran, Xiaojing Huang, Y J. Guo, J (Yiannis) Vardaxoglou

Faculty of Engineering and Information Sciences - Papers: Part B

Analog Least Mean Square (ALMS) loop is a promising method to cancel self-interference (SI) in in-band fullduplex (IBFD) systems. In this paper, the steady state analyses of the residual SI powers in both analog and digital domains are firstly derived. Eigenvalue decomposition is then utilized to investigate the frequency domain characteristics of the ALMS loop. Our frequency domain analyses prove that the ALMS loop has an effect of amplifying the frequency components of the residual SI at the edges of the signal spectrum in the analog domain. However, the matched filter in the receiver chain will reduce this effect, resulting …

The Development And Ballistic Performance Of Protective Steel-Concrete Composite Barriers Against Hypervelocity Impacts By Explosively Formed Projectiles, Alex M. Remennikov, Edward Gan, Tuan D. Ngo, Michael Netherton

Faculty of Engineering and Information Sciences - Papers: Part B

Explosively formed projectiles (EFP) are one of the most severe explosive and impact loading threats for civil infrastructure and military vehicles. Currently, there is no effective means of protection for military vehicles and infrastructure facilities from EFPs. This paper presents the experimental results of the hypervelocity impact of EFPs on steel-concrete (SC) barrier systems of finite dimensions. The SC barrier units tested were broadly representative of the type of protective SC units used in the expedient construction of barriers for mitigating improvised explosive device (IED) and EFP threats to critical infrastructure facilities. The response of non-composite, partially-composite, and fully-composite SC …

Investigation Of Engineering Properties Of Normal And High Strength Fly Ash Based Geopolymer And Alkali-Activated Slag Concrete Compared To Ordinary Portland Cement Concrete, Nabeel Farhan, M Neaz Sheikh, Muhammad N. S Hadi

Faculty of Engineering and Information Sciences - Papers: Part B

Fly ash-based geopolymer (FAGP) and alkali-activated slag (AAS) concrete are produced by mixing alkaline solutions with aluminosilicate materials. As the FAGP and AAS concrete are free of Portland cement, they have a low carbon footprint and consume low energy during the production process. This paper compares the engineering properties of normal strength and high strength FAGP and AAS concrete with OPC concrete. The engineering properties considered in this study included workability, dry density, ultrasonic pulse velocity (UPV), compressive strength, indirect tensile strength, flexural strength, direct tensile strength, and stress-strain behaviour in compression and direct tension. Microstructural observations using scanning electronic …

A Comparative Study Of A Niti Alloy Subjected To Uniaxial Monotonic And Cyclic Loading-Unloading In Tension Using Digital Image Correlation: The Grain Size Effect, Xiaohui Bian, Azdiar Adil Gazder, Ahmed A. Saleh, Elena V. Pereloma

Faculty of Engineering and Information Sciences - Papers: Part B

The present digital image correlation study characterised the local axial and shear strain fields of a 56Ni-44Ti wt.% shape memory alloy with an average grain size of 100 μm, under uniaxial monotonic and cyclic loading-unloading in tension. To elucidate the grain size effect, the results were compared with a previous investigation of the same alloy with an average grain size of 10 μm. The maximum local axial strain rate signified the direction and extent of the localised transformation. The widened single inclined transformation band and multiple criss-crossing patterns assist in straightening the sample edge by releasing an in-plane moment instigated …

Smart Approaches In Facilitating Engineering Students To Learn Health Technology, Winson Lee, Gursel Alici

Faculty of Engineering and Information Sciences - Papers: Part B

Partly due to the aging population around the world, job markets for developing biomedical devices and technology have been rapidly expanding. Organizations are recruiting engineers of various disciplines to design and test biomedical devices. This arouses interest of some engineering students to take academic subjects to learn some health technology, while keeping their main disciplines in specific engineering areas like mechanical engineering. Engineers need to have good understanding of the human body and different sorts of diseases, before they can apply good engineering solutions to solve the medical problems. However, teaching engineering students without prior education in medical-related aspects could …

Tele-Monitoring Technology As A Tool For Monitoring And Management Of Patients With Congestive Heart Failure, Elena Vlahu-Gjorgievska, Swetha Nagapuri, Khin Than Win

Faculty of Engineering and Information Sciences - Papers: Part B

Telehealth interventions are designed to facilitate the remote exchange of information and data between patients and health care providers, improving the quality and safety of the patients and increasing efficiency and cost-effectiveness of health care providers. The development of telecommunications and virtual technology allowed a number of telehealth systems to be applied in different health care areas. These technologies can provide an alternative monitoring and solutions for decreasing the hospital readmission rates for patients with congestive heart failure (CHF). In this paper, a systematic literature review regarding telemonitoring and its use in the management of patients with CHF is conducted. …

Experimental Study To Examine The Role Of Under Sleeper Pads For Improved Performance Of Ballast Under Cyclic Loading, Wickramarachchi Withanage Chamindi Jayasuriya, Buddhima Indraratna, Ngoc Trung Ngo

Faculty of Engineering and Information Sciences - Papers: Part B

The degradation and deformation of ballast critically affect the track geometry, safety, and passenger comfort. The increase in axle loads and train speed increases the stress applied on the ballast and exacerbates the rate of ballast degradation. This situation is more critical when tracks are built on stiff subgrades (e.g. bridges, tunnels and crossings), hence the use of energy absorbing (damping) layers in track substructure is a countermeasure to minimize track damage. In this study, a series of large-scale laboratory tests using the track process simulation testing apparatus (TPSA) is carried out to assess the performance of under sleeper pads …

Evaluation Of Data-Driven Models For Predicting The Service Life Of Concrete Sewer Pipes Subjected To Corrosion, Xuan Li, Faezehossadat Khademi, Yiqi Liu, Mahmoud Akbari, Chengduan Wang, Philip Bond, Jurg Keller, Guangming Jiang

Faculty of Engineering and Information Sciences - Papers: Part B

Concrete corrosion is one of the most significant failure mechanisms of sewer pipes, and can reduce the sewer service life significantly. To facilitate the management and maintenance of sewers, it is essential to obtain reliable prediction of the expected service life of sewers, especially if that is based on limited environmental conditions. Recently, a long-term study was performed to identify the controlling factors of concrete sewer corrosion using well-controlled laboratory-scale corrosion chambers to vary levels of H2S concentration, relative humidity, temperature and in-sewer location. Using the results of the long-term study, three different data-driven models, i.e. multiple linear regression (MLR), …

Massive Landsliding In Narrabeen Sandstones In The Watagan Region, S G. Fityus, Phil Flentje, R Rigby

Faculty of Engineering and Information Sciences - Papers: Part B

The Narrabeen Group is a thick sequence of bedded Triassic sandstones which occupies the stratigraphic interval between the Permian coal measures and the Hawkesbury Sandstone in the Sydney Basin. In the northern Sydney Basin it is laterally extensive, extending throughout the southern Hunter Valley from the Central Coast to beyond the Great Divide. In the Watagans region, a unique situation arises where a disconformity causes the Narrabeen group to be underlain directly by Permian upper marine sediments. The result is a dramatic occurrence of ancient massive landsliding, leading to steep sandstone slopes that break to an elevated detrital plane, of …

Crowdsourced Social Media Data For Disaster Management: Lessons From The Petajakarta.Org Project, Robert Ighodaro Ogie, Rodney J. Clarke, Hugh I. Forehead, Pascal Perez

SMART Infrastructure Facility - Papers

The application of crowdsourced social media data in flood mapping and other disaster management initiatives is a burgeoning field of research, but not one that is without challenges. In identifying these challenges and in making appropriate recommendations for future direction, it is vital that we learn from the past by taking a constructively critical appraisal of highly-praised projects in this field, which through real-world implementations have pioneered the use of crowdsourced geospatial data in modern disaster management. These real-world applications represent natural experiments, each with myriads of lessons that cannot be easily gained from computer-confined simulations. This paper reports on …