Engineering Commons^™

Ultimate Tilt-Bearing Capacity Of Bolted Connections In Cold-Reduced Steel Sheets, Lip H. Teh, Mehmet Eren Uz

Faculty of Engineering and Information Sciences - Papers: Part B

This paper examines the accuracy of design equations specified in the North American, European, and Australasian codes for cold-formed steel structures in determining the ultimate tilt-bearing capacity of single-shear bolted connections without washers in flat steel sheets. It points out that all the code equations do not properly distinguish the tilt-bearing failure mode from the conventional bearing failure mode. While the latter takes place downstream of the bolt, the former takes place upstream. Unlike the conventional bearing capacity, the tilt-bearing capacity is affected by the width of the connected sheet and does not vary linearly with either the sheet thickness …

Ultra Wideband Channel Coefficient Measurements For Detecting Methane Gas In A Multipath Environment, Ahmed Moftah Ownalla Alshabo, David Stirling, Montserrat Ros, Peter James Vial, Beata J. Wysocki, Tadeusz A. Wysocki, Nicholas Dal Sasso

Faculty of Engineering and Information Sciences - Papers: Part B

In this paper, an investigation was carried out into the effect of a non-explosive methane gas mixture on various Ultra Wide Band Channel Coefficients. Using simplified apparatus consisting of a rubberized tube (6 mm diameter) connected for significant periods to either a (pressurized) source of mixed Methane and Nitrogen or alternatively to a Nitrogen only source. The tube containing either gas feed was wrapped using two complete turns around a 160mm diameter PVC pipe. Several flows of the mixed gas, containing 2.57% methane, were introduced and flowed through the pipe before being sealed in the tube. Removal of any Methane …

Opml: A One-Pass Closed-Form Solution For Online Metric Learning, Wenbin Li, Yang Gao, Lei Wang, Luping Zhou, Jing Huo, Yinghuan Shi

Faculty of Engineering and Information Sciences - Papers: Part B

To achieve a low computational cost when performing online metric learning for large-scale data, we present a one-pass closed-form solution namely OPML in this paper. Typically, the proposed OPML first adopts a one-pass triplet construction strategy, which aims to use only a very small number of triplets to approximate the representation ability of whole original triplets obtained by batch-manner methods. Then, OPML employs a closed-form solution to update the metric for new coming samples, which leads to a low space (i.e., O(d)) and time (i.e., O(d 2)) complexity, where d is the feature dimensionality. In addition, an extension of OPML …

Inertial Microfluidics: Mechanisms And Applications, Jun Zhang, Weihua Li, Gursel Alici

Faculty of Engineering and Information Sciences - Papers: Part B

In microfluidics, the typical sample volume is in the order of nL, which is incompatible with the common biosample volume in biochemistry and clinical diagnostics (usually ranging from 1 μL to approximately 1 mL). The recently emerged inertial microfluidic technology offers the possibility to process large volume (∼mL) of biosample by well-defined micro-structures. In contrast to conventional microfluidic technologies, where fluid inertia is negligible and flow remains almost within Stokes flow region with very low Reynolds number Re≪1 (Re=ρfUfH/μ, where ρ f, Ū f and μ are fluid density, average velocity and dynamic viscosity, respectively, and H is channel hydraulic …

How Should A Local Regime-Switching Model Be Calibrated?, Xin-Jiang He, Song-Ping Zhu

Faculty of Engineering and Information Sciences - Papers: Part B

Local regime-switching models are a natural consequence of combining the concept of a local volatility model with that of a regime-switching model. However, even though Elliott et al. (2015) have derived a Dupire formula for a local regime-switching model, its calibration still remains a challenge, primarily due to the fact that the derived volatility function for each state involves all the state price variables whereas only one market price is available for model calibration, and a direct implementation of Elliott et al.'s formula may not yield stable results. In this paper, a closed system for option pricing and data extraction …

Incorporation Of Glass-Reinforced Hydroxyapatite Microparticles Into Poly(Lactic Acid) Electrospun Fibre Mats For Biomedical Applications, Daniel Santos, Cristina Correia, D M. Silva, P S. Gomes, M H. Fernandes, J D. Santos, Vitor Sencadas

Faculty of Engineering and Information Sciences - Papers: Part B

Tissue engineering is constantly evolving towards novel materials that mimic the properties of the replaced injured tissue or organ. A hybrid electrospun membrane of electroactive poly(l-acid lactic) (PLLA) polymer with glass reinforced hydroxyapatite (Bonelike®) microparticles placed among the polymer fibres in a morphology like "islands in the sea" was processed. The incorporation of 60 to 80 wt% Bonelike® bone grafts granules with ≤ 150 μm into the polymer solution lead to an amorphous polymeric fibre membranes, and a decrease of the average polymer fibre diameter from 550 ± 150 nm for neat PLA down to 440 ± 170 nm for …

A Review On Performance Enhancement Techniques For Ambient Vibration Energy Harvesters, Tanju Yildirim, Mergen H. Ghayesh, Weihua Li, Gursel Alici

Faculty of Engineering and Information Sciences - Papers: Part B

Due to increased demands for energy and the current limitations of batteries, a future prospective technology are vibration energy harvesters that convert kinetic vibration energy into electrical energy. These energy harvesters have the potential to be used in powering small electronic devices such as measurement equipment in remote or hostile environments where batteries are not a viable option. Current limitations of vibration based energy harvesters is the total available power generated and the frequency at which they effectively collect ambient vibration sources for producing power; this paper aims to review the current techniques that are being employed to enhance the …

A Hybrid Bp-Ep-Vmp Approach To Joint Channel Estimation And Decoding For Ftn Signaling Over Frequency Selective Fading Channels, Nan Wu, Weijie Yuan, Qinghua Guo, Jingming Kuang

Faculty of Engineering and Information Sciences - Papers: Part B

This paper deals with low-complexity joint channel estimation and decoding for faster-than-Nyquist (FTN) signaling over frequency selective fading channels. The inter-symbol interference (ISI) imposed by FTN signaling and the frequency selective channel are intentionally separated to fully exploit the known structure of the FTN-induced ISI. Colored noise due to the faster sampling rate than that of the Nyquist signaling system is approximated by autoregressive process. A Forney style factor graph representation of the FTN system is developed and Gaussian message passing is performed on the graph. Expectation propagation (EP) is employed to approximate the message from channel decoder to Gaussian …

Strain-Induced Ferrite Formation And Its Effect On Mechanical Properties Of A Dual Phase Steel Produced Using Laboratory Simulated Strip Casting, Zhiping Xiong, Ahmed A. Saleh, Andrii Kostryzhev, Elena V. Pereloma

Faculty of Engineering and Information Sciences - Papers: Part B

Thermo-mechanical processing of a strip cast dual phase (DP) steel was carried out using a Gleeble thermo-mechanical simulator. The effect of deformation temperatures in the range from 1050 to 700 °C on the microstructure evolution was investigated using optical, scanning and transmission electron microscopy along with electron backscattering diffraction (EBSD). Strain-induced ferrite (SIF) formation was observed following austenite deformation (∼0.41 reduction) in the 800–700 °C temperature range, leading to a ferrite grain refinement down to 3.1 ± 2.3 μm. A novel segmentation procedure was applied to separate selected EBSD maps into polygonal ferrite, SIF and second phase regions (bainite/martensite). Following …

Phenol Rejection By Cellulose Triacetate And Thin Film Composite Forward Osmosis Membranes, Tingting Xiao, Long D. Nghiem, Jianfeng Song, Ruyi Bao, Xuemei Li, Tao He

Faculty of Engineering and Information Sciences - Papers: Part B

This study aims to elucidate the separation of phenol by reverse osmosis (RO) and forward osmosis (FO) modes and propose strategies to enhance phenol rejection by these two processes. The results show that phenol rejection was strongly influenced by water flux, membrane materials, membrane structure, modes of operation, and feed solution chemistry (i.e. pH). The relationship between phenol rejection and water flux was demonstrated by the irreversible thermodynamic model which could accurately simulate phenol rejection as a function of water flux. At pH 7, phenol rejection by cellulose acetate (CTA) membranes was negligible while the thin film composite (TFC) polyamide …

The Impact Of The Mode Of Survey Administration On Estimates Of Daily Smoking For Mobile Phone Only Users, Joseph Hanna, Damien V. Cordery, David G. Steel, Walter R. Davis, Timothy Harrold

Faculty of Engineering and Information Sciences - Papers: Part B

Background: Over the past decade, there have been substantial changes in landline and mobile phone ownership, with a substantial increase in the proportion of mobile-only households. Estimates of daily smoking rates for the mobile phone only (MPO) population have been found to be substantially higher than the rest of the population and telephone surveys that use a dual sampling frame (landline and mobile phones) are now considered best practice. Smoking is seen as an undesirable behaviour; measuring such behaviours using an interviewer may lead to lower estimates when using telephone based surveys compared to self-administered approaches. This study aims to …

Reinforcing Synchronization Securely In Online Contests With Embedded Computing, Wei Wang, Peng Xu, Laurence T. Yang, Willy Susilo, Jinjun Chen

Faculty of Engineering and Information Sciences - Papers: Part B

When competing in eBay bidding, online games or e-exams in embedded computing environments, people naturally face asynchronous starts from different computing devices, which is treated as a security risk of online contests. The security risks of online contest also include eavesdropping during data transmission without intended rights, and false start by malicious competitors, which also means asynchrony in contests. Accordingly, online contests need security guarantee especially on synchronization. In this paper, for synchronic and secure start in a contest, we update security requirements of confidentiality, anonymity and synchrony comparing to our previous work. Based on the updated requirements, we propose …

The Architecture Of An Effective Software Application For Managing Enterprise Projects, Reza R. Zamani, Robert B. K Brown, Ghassan Beydoun, William J. Tibben

Faculty of Engineering and Information Sciences - Papers: Part B

No abstract provided.

Potential Biological And Chemical Clogging Of Piezometer Filters In Acid Sulphate Soil, Buddhima Indraratna, Pankaj Baral, Jayantha Ameratunga, Bandula Kendaragama

Faculty of Engineering and Information Sciences - Papers: Part B

Instrumentation for performance monitoring of an embankment built on soft soils is vital for assessing the progress of consolidation and confirming (or refuting) soil parameters used in design when there are significant design uncertainties and the monitoring data can be used to calibrate the design soil parameters. A suite of instruments including settlement plates, extensometers, piezometers, inclinometers is often employed for this purpose. In the first Author's experience, erroneous readings interpretations of pore water pressure (PWP) readings have been reported in various case studies involving transport infrastructure development and reclamations works both in Australia and South East Asia, especially in …

Strength Properties Of Grout For Strata Reinforcement, Naj Aziz, Dean Majoor, Ali Mirza

Faculty of Engineering and Information Sciences - Papers: Part B

An experimental study was carried out on grout samples prepared from both Stratabinder and BU100 cementitious products. Samples were prepared with various water to grout ratios and tested for uniaxial compressive and shear strength. Triaxial tests were performed on cylindrical samples to determine values for internal friction angle, cohesion and tensile strength. It was found that the water to cement ratio affects the uniaxial compressive and shear strength of grout. The triaxial test indicated that both internal friction angle and cohesion of Stratabinder do not differ significantly from BU100.

Innovative Approach To Monitoring Coal Pillar Deformation And Roof Movement Using 3d Laser Technology, Vlastimil Kajzar, Radovan Kukutsch, Petr Waclawik, Jan Nemcik

Faculty of Engineering and Information Sciences - Papers: Part B

Monitoring of pillar and roadway deformations is one of the most important issues in geotechnical engineering and mining practice. The use of 3D laser technology is ideal to monitor strata displacements in underground excavations enabling complex spatial data capture of the entire space around monitored pillars including all roof and rib deformation which occurs during the pillar excavation. This method based on repeated scans, can monitor the excavation surface movement ranging from a few mm to more than 600 mm. The 3D laser scanner was used to monitor the coal mine roadways and pillar stability in room and pillar panel …

Lithium Extraction From Chinese Salt-Lake Brines: Opportunities, Challenges, And Future Outlook, Jianfeng Song, Long D. Nghiem, Xuemei Li, Tao He

Faculty of Engineering and Information Sciences - Papers: Part B

Chinese salt-lake brine is mainly of the magnesium sulfate subtype with a high Mg/Li ratio. Mining lithium from Chinese salt-lake brine has been a decades-long technical challenge. The pros and cons of various technologies are briefly discussed. Chemical extraction has been the most important technology for the recovery of lithium from Chinese salt-lake brine with a high Mg/Li ratio. Several other innovative technologies, including lithium ion sieves, membrane separation, and electro-electrodialysis, have also emerged as potential options.

Performance Of Buried Hdpe Pipes - Part I: Peaking Deflection During Initial Backfilling Process, Min Zhou, Yan Jun Du, Fei Wang, Martin D. Liu

Faculty of Engineering and Information Sciences - Papers: Part B

Peaking deflection caused by compacting the sidefill, referred to as the maximum change of the pipe diameter divided by the undeformed diameter, is an important parameter in the design and safety check of buried pipelines. However, quantitative equations on the deflection useful for engineering practice are very limited. In this paper, a two-dimensional finite element analysis is used to investigate the peaking deflection of high-density polyethylene (HDPE) pipes. In the analyses, the pipe¿soil interaction is rationally modeled. A field trial is conducted and the finite-element modeling is evaluated by using the data measured in the field test. Parametric studies are …

Proposed Amendment To Iec/Tr 61000.3.6:2008 For Harmonic Allocation To Loads In Transmission Systems, Tuan Vu, Duane A. Robinson, Victor J. Gosbell, Sarath Perera, Rizah Memisevic

Faculty of Engineering and Information Sciences - Papers: Part B

Ensuring harmonic voltage distortion levels in transmission systems remain below acceptable levels relies on appropriate allocations of emissions to customer loads and bulk supply points. A number of practical issues have been identified with the existing harmonic allocation method for transmission systems in the technical report IEC/TR 61000-3-6:2008, Ed.2: the method to assess the total available power of a busbar, a key component to harmonic allocations, is not intuitive and there is a lack of clarity in the report; the method for sharing planning levels also does not allow unused spare capacity at a busbar to be shared with other …

Impact Of A Monolithic Silicon Detector Operating In Transmission Mode On Clinical Photon Beams, Kananan Utitsarn, Z A. Alrowaili, Nauljun Stansook, Marco Petasecca, Martin G. Carolan, Vladimir Perevertaylo, Michael L. F Lerch, Anatoly B. Rosenfeld

Faculty of Engineering and Information Sciences - Papers: Part B

Purpose

To investigate the effect on surface dose, as a function of different field sizes and distances from the solid water phantom to transmission detector (D_sd), of using the monolithic silicon detector MP512T in transmission mode.

Methods

The influence of operating the MP512T in transmission mode on the surface dose of a phantom for SSD 100cm was evaluated by using a Markus IC. The MP512T was fixed to an adjustable stand holder and was positioned at different D_sd, ranging from 0.3 to 24 cm. For each D_sd, measurements were carried out for irradiation field …

Joint Low-Rank And Sparse Based Image Reconstruction For Through-The-Wall Radar Imaging, Fok Hing Chi Tivive, Abdesselam Bouzerdoum

Faculty of Engineering and Information Sciences - Papers: Part B

Through-the-wall radar uses electromagnetic waves to detect and discern targets behind opaque obstacles, such as doors and walls. Wall clutter mitigation and scene reconstruction are performed to produce the image of the behind-the-wall scene. These two problems, however, are often addressed separately, which may result in a suboptimal solution. In this paper, the wall clutter removal and image formation are unified as a joint low-rank and sparsity constrained optimization problem, which is solved using augmented Lagrange multiplier method. Experimental results shows that the proposed method produces clearer images than the existing method that uses a wall clutter mitigation method in …

Managing Open Innovation: An Exploration Of Information Technologies And Open Search Patterns, Tingru Cui, Na Liu

Faculty of Engineering and Information Sciences - Papers: Part B

No abstract provided.

Statistical Shape Model Generation Using Diffeomorphic Surface Registration, Jiaqi Wu, Guangxu Li, Huimin Lu, Hyoung Kim, Philip O. Ogunbona

Faculty of Engineering and Information Sciences - Papers: Part B

Statistical shape modelling is an efficient and robust method for medical image segmentation in computer-aided diagnosis. The key step in building a statistical shape model is to find corresponding landmarks in each instance of a training set. In this paper, a novel landmark correspondence estimation method that uses edge collapse surface simplification and the sphere registration is proposed. All the landmarks are selected and transformed by spherical conformal mapping from the instances of the training set and the associated correspondence are automatically found on the spheres. We applied our method on 21 cases of 3-D right lung shapes. The results …

Multi-Objective Search-Based Approach To Estimate Issue Resolution Time, Wisam Al-Zubaidi, Hoa K. Dam, Aditya K. Ghose, Xiaodong Li

Faculty of Engineering and Information Sciences - Papers: Part B

Background: Resolving issues is central to modern agile software development where a software is developed and evolved incrementally through series of issue resolutions. An issue could represent a requirement for a new functionality, a report of a software bug or a description of a project task. Aims: Knowing how long an issue will be resolved is thus important to different stakeholders including end-users, bug reporters, bug triagers, developers and managers. This paper aims to propose a multi-objective search-based approach to estimate the time required for resolving an issue. Methods: Using genetic programming (a meta-heuristic optimization method), we iteratively generate candidate …

Distributed Strain Measurement Using Fibre Optics In A High Performance Composite Hydrofoil, Phyo Maung, Gangadhara B. Prusty, Ginu Rajan, Enbang Li, Andrew W. Phillips, Nigel St John

Faculty of Engineering and Information Sciences - Papers: Part B

With rapidly advancing composite manufacturing industry in recent years, advanced composites have become favourable alternative materials to conventional alloys in marine propeller production. However, composite structures are very susceptible to failure and thus strain monitoring in multiple locations throughout the structure will be essential to prevent catastrophic failure. In this experiment, composite hydrofoil was manufactured using resin transfer moulding (RTM) and embedded with a standard single mode optical fibre along the trailing and leading edges for distributed strain sensing. Distributed sensing with continuous fibre can be implemented in complex composite structures such as a high performance composite hydrofoil or propeller …

Enhanced Materials Performance Of Al/Ti/Al Laminate Sheets Subjected To Cryogenic Roll Bonding, Hai Liang Yu, Cheng Lu, Anh Kiet Tieu, Hui Jun Li, Ajit R. Godbole, Xiong Liu, Charlie Kong

Faculty of Engineering and Information Sciences - Papers: Part B

Laminate sheets attract increasing attention from researchers and engineers. In this paper, Al/Ti/Al laminate sheets were fabricated by using cryogenic roll bonding for first time. The edge defects, mechanical properties, and interface bonding of laminate sheets by cryogenic roll bonding technique were compared with these by room-temperature roll bonding technique. Results show that there are some edge cracks in laminate sheets by room-temperature roll bonding while they do not appear when subjected to cryogenic roll bonding. The ultimate tensile stress of laminate sheets by cryogenic roll bonding increases up to 36.7% compared to that by room-temperature roll bonding. When laminate …

R Package Asmap: Efficient Genetic Linkage Map Construction And Diagnosis, J D. Taylor, David G. Butler

Faculty of Engineering and Information Sciences - Papers: Part B

Although various forms of linkage map construction software are widely available, there is a distinct lack of packages for use in the R statistical computing environment (R Core Team 2017). This article introduces the ASMap linkage map construction R package which contains functions that use the efficient MSTmap algorithm (Wu, Bhat, Close, and Lonardi 2008) for clustering and optimally ordering large sets of markers. Additional to the construction functions, the package also contains a suite of tools to assist in the rapid diagnosis and repair of a constructed linkage map. The package functions can also be used for post linkage …

Effects Of Surface Preparation On Tribological Behaviour Of A Ferritic Stainless Steel In Hot Rolling, Xiawei Cheng, Zhengyi Jiang, Dongbin Wei, Liang Hao, Hui Wu, Wenzhen Xia, Xin Zhang, Suzhen Luo, Laizhu Jiang

Faculty of Engineering and Information Sciences - Papers: Part B

Some defects on the surface of carbon steel do not need to be removed before hot rolling because the surface will be vigorously oxidised in a reheating environment. Thus the defects can be minimised by oxidising and then removed by the de-scaling process. The defects on the surface of ferritic stainless steels, however, are not easily removed by oxidation when a high chromium concentration is used. In this paper, a ferritic stainless steel grade 445 was selected as a research material. The effects of different surface features on oxidation and tribological behaviour in the hot rolling process were investigated. Three …

On The Convergence Of He And Zhu's New Series Solution For Pricing Options With The Heston Model, Song-Ping Zhu, Xin-Jiang He

Faculty of Engineering and Information Sciences - Papers: Part B

In this paper, a modified formula for European options and a set of complete convergence proofs for the solution that cover the entire time horizon of a European option contact are presented under the Heston model with minimal entropy martingale measure. Although He & Zhu [5] worked on this model, they only provided a converged solution with a condition imposed on the time to expiry. The new solution presented here is only slightly modified in its form. But, it is accompanied with the proof of convergence of the solution for the entire span of the time horizon of an option.

A Unified Censored Normal Regression Model For Qpcr Differential Gene Expression Analysis, Peter Pipelers, Lieven Clement, Matthijs Vynck, Jan Hellemans, J Vandesompele, Olivier Thas

Faculty of Engineering and Information Sciences - Papers: Part B

Reverse transcription quantitative polymerase chain reaction (RT-qPCR) is considered as the gold standard for accurate, sensitive, and fast measurement of gene expression. Prior to downstream statistical analysis, RT-qPCR fluorescence amplification curves are summarized into one single value, the quantification cycle (Cq). When RT-qPCR does not reach the limit of detection, the Cq is labeled as "undetermined". Current state of the art qPCR data analysis pipelines acknowledge the importance of normalization for removing non-biological sample to sample variation in the Cq values. However, their strategies for handling undetermined Cq values are very ad hoc. We show that popular methods for handling …