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Articles 31 - 60 of 487
Full-Text Articles in Social and Behavioral Sciences
Innovative Analysis Of Luders Band Behaviour In X80 Pipeline Steel, Jian Han, Cheng Lu, Bintao Wu, Jintao Li, Hui Jun Li, Yao Lu, Qiuzhi Gao
Innovative Analysis Of Luders Band Behaviour In X80 Pipeline Steel, Jian Han, Cheng Lu, Bintao Wu, Jintao Li, Hui Jun Li, Yao Lu, Qiuzhi Gao
Faculty of Engineering and Information Sciences - Papers: Part A
In this study, the influence of Luders bands, which are frequently observed after the pipe coating process, is investigated. Stratified tensile test specimens, machined from different locations across the thickness of an X80 line pipe, were tested. The Luders bands were observed by using a digital image correlation (DIC) in the specimen machined from halfway across the pipe wall thickness. The specimens from the selected locations related to the Luders bands were studied and compared by means of optical microscopy (OM), scanning electron microscopy (SEM), X-ray diffraction (XRD), electron backscatter diffraction (EBSD) and standard mechanical testing. The results display that …
Characterization And Mechanical Properties Of Α-Al2o3 Particle Reinforced Aluminium Matrix Composites, Synthesized Via Uniball Magneto-Milling And Uniaxial Hot Pressing, Buraq Talib Shalash Al-Mosawi, David Wexler, Andrzej Calka
Characterization And Mechanical Properties Of Α-Al2o3 Particle Reinforced Aluminium Matrix Composites, Synthesized Via Uniball Magneto-Milling And Uniaxial Hot Pressing, Buraq Talib Shalash Al-Mosawi, David Wexler, Andrzej Calka
Faculty of Engineering and Information Sciences - Papers: Part A
Al-based composite powders containing 2, 4, 7 and 10 volume fraction of α-Al2O3 were prepared using the uniball controlled magneto-milling method and were then uniaxially hot pressed at (600 ± 10)°C under 70 MPa for 15 min. The resulting composites were greater than 99% theoretical density with enhanced mechanical properties. Detailed characterization was performed using: X-ray diffraction, scanning electron microscopy equipped with energy dispersive spectroscopy, electrical conductivity, compression, ultra-micro indentation testing and pin on drum wear testing at ambient temperature. Microstructure-mechanical property correlations were obtained as functions of α-Al2O3 volume fraction. It was found …
High-Throughput Sheathless And Three-Dimensional Microparticle Focusing Using A Microchannel With Arc-Shaped Groove Arrays, Qianbin Zhao, Jun Zhang, Sheng Yan, Dan Yuan, Haiping Du, Gursel Alici, Weihua Li
High-Throughput Sheathless And Three-Dimensional Microparticle Focusing Using A Microchannel With Arc-Shaped Groove Arrays, Qianbin Zhao, Jun Zhang, Sheng Yan, Dan Yuan, Haiping Du, Gursel Alici, Weihua Li
Faculty of Engineering and Information Sciences - Papers: Part A
Sheathless particle focusing which utilises the secondary flow with a high throughput has great potential for use in microfluidic applications. In this work, an innovative particle focusing method was proposed. This method makes use of a mechanism that takes advantage of secondary flow and inertial migration. The device was a straight channel with arrays of arc-shaped grooves on the top surface. First, the mechanism and expected focusing phenomenon are explained using numerical simulation of the flow field and force balance. A simulation of particle trajectories was conducted as a reference, and then a series of experiments was designed and the …
Membership Function Based Matching Approach Of Buyers And Sellers Through A Broker In Open E-Marketplace, Dien Tuan Le, Minjie Zhang, Fenghui Ren
Membership Function Based Matching Approach Of Buyers And Sellers Through A Broker In Open E-Marketplace, Dien Tuan Le, Minjie Zhang, Fenghui Ren
Faculty of Engineering and Information Sciences - Papers: Part A
No abstract provided.
Bots Without Borders: How Anonymous Accounts Hijack Political Debate, Katina Michael
Bots Without Borders: How Anonymous Accounts Hijack Political Debate, Katina Michael
Faculty of Engineering and Information Sciences - Papers: Part A
No abstract provided.
Connection Between Trinomial Trees And Finite Difference Methods For Option Pricing With State-Dependent Switching Rates, Jingtang Ma, Hongji Tang, Song-Ping Zhu
Connection Between Trinomial Trees And Finite Difference Methods For Option Pricing With State-Dependent Switching Rates, Jingtang Ma, Hongji Tang, Song-Ping Zhu
Faculty of Engineering and Information Sciences - Papers: Part A
Tree approaches (binomial or trinomial trees) are very popularly used in finance industry to price financial derivatives. Such popularity stems from their simplicity and clear financial interpretation of the methodology. On the other hand, PDE (partial differential equation) approaches, with which standard numerical procedures such as the finite difference method (FDM), are characterized with the wealth of existing theory, algorithms and numerical software that can be applied to solve the problem. For a simple geometric Brownian motion model, the connection between these two approaches is studied, but it is lower-order equivalence. Moreover such a connection for a regime-switching model is …
A Degree Theory For Second Order Nonlinear Elliptic Operators With Nonlinear Oblique Boundary Conditions, Yanyan Li, Jiakun Liu, Luc Nguyen
A Degree Theory For Second Order Nonlinear Elliptic Operators With Nonlinear Oblique Boundary Conditions, Yanyan Li, Jiakun Liu, Luc Nguyen
Faculty of Engineering and Information Sciences - Papers: Part A
In this paper, we introduce an integer-valued degree for second order fully nonlinear elliptic operators with nonlinear oblique boundary conditions. We also give some applications to the existence of solutions of certain nonlinear elliptic equations arising from a Yamabe problem with boundary and reflector problems.
Multivariate Spatial Data Fusion For Very Large Remote Sensing Datasets, Hai Nguyen, Noel A. Cressie, Amy Braverman
Multivariate Spatial Data Fusion For Very Large Remote Sensing Datasets, Hai Nguyen, Noel A. Cressie, Amy Braverman
Faculty of Engineering and Information Sciences - Papers: Part A
Global maps of total-column carbon dioxide (CO2) mole fraction (in units of parts per million) are important tools for climate research since they provide insights into the spatial distribution of carbon intake and emissions as well as their seasonal and annual evolutions. Currently, two main remote sensing instruments for total-column CO2 are the Orbiting Carbon Observatory-2 (OCO-2) and the Greenhouse gases Observing SATellite (GOSAT), both of which produce estimates of CO2 concentration, called profiles, at 20 different pressure levels. Operationally, each profile estimate is then convolved into a single estimate of column-averaged CO2 using a linear pressure weighting function. This …
Linearization Of Ebt3 Film Dose Response And Virtual Film Dosimetry For Sbrt Quality Assurance, Meng Cai, Ben Archibald-Heeren, Yang Wang, Peter E. Metcalfe
Linearization Of Ebt3 Film Dose Response And Virtual Film Dosimetry For Sbrt Quality Assurance, Meng Cai, Ben Archibald-Heeren, Yang Wang, Peter E. Metcalfe
Faculty of Engineering and Information Sciences - Papers: Part A
EBT3 film offers high spatial resolution and low energy dependence, making it a suitable choice for quality assurance where high dose gradients are present, such as the case for SBRT. This work presents a simple method to adjust scanner settings so that dose response becomes linear. This linearity eliminates the need to obtain a calibration curve and associated uncertainties in curve fitting. Relative dosimetry can be performed after dose normalization to a reference point. Linearity is also a more robust condition than calibration curve with respect to scanner warm-up conditions, resulting in reduced uncertainty in dose measurement. An in-house developed …
The Angular Dependence Of A Two Dimensional Monolithic Detector Array For Dosimetry In Small Radiation Fields, Nauljun Stansook, Marco Petasecca, Kananan Utitsarn, Matthew Newall, Peter E. Metcalfe, Martin G. Carolan, Michael L. F Lerch, Anatoly B. Rosenfeld
The Angular Dependence Of A Two Dimensional Monolithic Detector Array For Dosimetry In Small Radiation Fields, Nauljun Stansook, Marco Petasecca, Kananan Utitsarn, Matthew Newall, Peter E. Metcalfe, Martin G. Carolan, Michael L. F Lerch, Anatoly B. Rosenfeld
Faculty of Engineering and Information Sciences - Papers: Part A
The purpose of this study is to investigate the directional dependence of a two dimensional monolithic detector array (M512) under 6 MV photon irradiation and to evaluate the effect of field size on angular dependence. Square fields of sizes: 3x3 cm2 and 10x10 cm2 were measured at the iso-centre of a cylindrical phantom. Beam angles with incidences from 00- 1800 in increments of 150 were used to investigate the central pixel angular response of M512, normalized to the pixel response for normal (0°) beam incidence. The angular response of the detector was compared to …
Design Of Geopolymer Concrete With Ggbfs At Ambient Curing Condition Using Taguchi Method, Muhammad N. S Hadi, Nabeel Farhan, M Neaz Sheikh
Design Of Geopolymer Concrete With Ggbfs At Ambient Curing Condition Using Taguchi Method, Muhammad N. S Hadi, Nabeel Farhan, M Neaz Sheikh
Faculty of Engineering and Information Sciences - Papers: Part A
In this paper, the Taguchi method has been used to design optimum mix proportions for geopolymer concrete with ground granulated blast furnace slag (GGBFS) as aluminosilicate source at ambient curing condition. The influences of binder content, alkaline activator to binder content (Al/Bi) ratio, sodium silicate to sodium hydroxide (SS/SH) ratio, and sodium hydroxide (SH) concentration on the geopolymer concrete were investigated. A total of nine mix designs were evaluated. It was found that specimens with a binder content of 450 kg/m3, Al/Bi ratio of 0.35, SS/SH ratio of 2.5, and SH concentration of 14 M produced the highest …
History Of International Workshop On Mini-Micro- And Nano- Dosimetry (Mmnd) And Innovation Technologies In Radiation Oncology (Itro), Anatoly B. Rosenfeld, Marco Zaider, J Yamada, M Zelefsky
History Of International Workshop On Mini-Micro- And Nano- Dosimetry (Mmnd) And Innovation Technologies In Radiation Oncology (Itro), Anatoly B. Rosenfeld, Marco Zaider, J Yamada, M Zelefsky
Faculty of Engineering and Information Sciences - Papers: Part A
The biannual MMND (former MMD) - IPCT workshops was founded in collaboration between the Centre for Medical Radiation Physics, University of Wollongong and the Memorial Sloan Kettering Cancer Center (MSKCC) in 2001 and has become an important international multidisciplinary forum for the discussion of advanced quality assurance (QA) dosimetry technology for radiation therapy and space science, as well as advanced technologies for clinical cancer treatment.
Optimisation Of Output Factor Measurements Using The Magic Plate 512 Silicon Dosimeter Array In Small Megavoltage Photon Fields, Kananan Utitsarn, Z A. Alrowaili, Nauljun Stansook, Michael L. F Lerch, Marco Petasecca, Martin G. Carolan, Anatoly B. Rosenfeld
Optimisation Of Output Factor Measurements Using The Magic Plate 512 Silicon Dosimeter Array In Small Megavoltage Photon Fields, Kananan Utitsarn, Z A. Alrowaili, Nauljun Stansook, Michael L. F Lerch, Marco Petasecca, Martin G. Carolan, Anatoly B. Rosenfeld
Faculty of Engineering and Information Sciences - Papers: Part A
We evaluate the impact of an air gap and optimization of this air gap for the MP512 silicon detector array when operated in dosimetry mode for small photon field measurements in solid water. We present output factor measurements for 6MV and 10 MV photon beams with the square field sizes ranging from 0.5 to 10 cm2. The size of the air gap above the MP512 detector was changed from 0.5, 1.0, 1.2, 2.0 and 2.6 mm. We compare the output factors measurements of the MP512 with EBT3 film and the MOSkin dosimeter. For the two photon energies …
New 3d Silicon Detectors For Dosimetry In Microbeam Radiation Therapy, Michael L. F Lerch, Andrew Dipuglia, Matthew Cameron, Pauline Fournier, Jeremy A. Davis, Marco Petasecca, Iwan Cornelius, Vladimir Perevertaylo, Anatoly B. Rosenfeld
New 3d Silicon Detectors For Dosimetry In Microbeam Radiation Therapy, Michael L. F Lerch, Andrew Dipuglia, Matthew Cameron, Pauline Fournier, Jeremy A. Davis, Marco Petasecca, Iwan Cornelius, Vladimir Perevertaylo, Anatoly B. Rosenfeld
Faculty of Engineering and Information Sciences - Papers: Part A
Microbeam Radiation Therapy (MRT) involves the use of a spatially fractionated beam of synchrotron generated X-rays to treat tumours. MRT treatment is delivered via an array of high dose 'peaks' separated by low dose 'valleys'. A good Peak to Valley Dose Ratio (PVDR) is an important indicator of successful treatment outcomes. MRT dosimetry requires a radiation hard detector with high spatial resolution, large dynamic range, which is ideally real-time and tissue equivalent. We have developed a Silicon Strip Detector (SSD) and very recently, a new 3D MESA SSD to meet the very stringent requirements of MRT dosimetry. We have compared …
Experimental Studies With Two Novel Silicon Detectors For The Development Of Time-Of-Flight Spectrometry Of Laser-Accelerated Proton Beams, M Würl, S Reinhardt, Anatoly B. Rosenfeld, Marco Petasecca, Michael L. F Lerch, Linh T. Tran, S Karsch, W Assmann, J Schreiber, Katia Parodi
Experimental Studies With Two Novel Silicon Detectors For The Development Of Time-Of-Flight Spectrometry Of Laser-Accelerated Proton Beams, M Würl, S Reinhardt, Anatoly B. Rosenfeld, Marco Petasecca, Michael L. F Lerch, Linh T. Tran, S Karsch, W Assmann, J Schreiber, Katia Parodi
Faculty of Engineering and Information Sciences - Papers: Part A
Laser-accelerated proton beams exhibit remarkably different beam characteristics as compared to conventionally accelerated ion beams. About 105 to 107 particles per MeV and msr are accelerated quasi-instantaneously within about 1 ps. The resulting energy spectrum typically shows an exponentially decaying distribution. Our planned approach to determine the energy spectrum of the particles generated in each pulse is to exploit the time-of-flight (TOF) difference of protons with different kinetic energies at 1 m distance from the laser-target interaction. This requires fast and sensitive detectors. We therefore tested two prototype silicon detectors, developed at the Centre for Medical Radiation Physics …
Statistical Properties Of Atmospheric Greenhouse Gas Measurements: Looking Down From Space And Looking Up From The Ground, Bohai Zhang, Noel A. Cressie, Debra Wunch
Statistical Properties Of Atmospheric Greenhouse Gas Measurements: Looking Down From Space And Looking Up From The Ground, Bohai Zhang, Noel A. Cressie, Debra Wunch
Faculty of Engineering and Information Sciences - Papers: Part A
Satellite remote sensing platforms can collect measurements on a global scale within a few days, which provides an unprecedented opportunity to characterize and understand the spatio-temporal variability of environmental variables. Because of the additional challenges of making precise and accurate measurements from space, it is essential to validate satellite remote sensing datasets with highly precise and accurate ground-based measurements. The focus of this article is on two sets of measurements: Atmospheric column-averaged carbon dioxide (CO2) collected by the Orbiting Carbon Observatory-2 (OCO-2) mission in its target mode of operation; and ground-based data used for validation from the Total Carbon Column …
Selection Bias In The Reported Performances Of Ad Classification Pipelines, Alex F. Mendelson, Maria A. Zuluaga, Marco Lorenzi, Brian F. Hutton, Sebastien Ourselin
Selection Bias In The Reported Performances Of Ad Classification Pipelines, Alex F. Mendelson, Maria A. Zuluaga, Marco Lorenzi, Brian F. Hutton, Sebastien Ourselin
Faculty of Engineering and Information Sciences - Papers: Part A
The last decade has seen a great proliferation of supervised learning pipelines for individual diagnosis and prognosis in Alzheimer's disease. As more pipelines are developed and evaluated in the search for greater performance, only those results that are relatively impressive will be selected for publication. We present an empirical study to evaluate the potential for optimistic bias in classification performance results as a result of this selection. This is achieved using a novel, resampling-based experiment design that effectively simulates the optimisation of pipeline specifications by individuals or collectives of researchers using cross validation with limited data. Our findings indicate that …
Direct Parametric Reconstruction With Joint Motion Estimation/Correction For Dynamic Brain Pet Data, Jieqing Jiao, Alexandre B. Bousse, Kris Thielemans, Ninon Burgos, Philip Weston, Jonathan M. Schott, David Atkinson, Simon R. Arridge, Brian F. Hutton, Pawel Markiewicz, Sebastien Ourselin
Direct Parametric Reconstruction With Joint Motion Estimation/Correction For Dynamic Brain Pet Data, Jieqing Jiao, Alexandre B. Bousse, Kris Thielemans, Ninon Burgos, Philip Weston, Jonathan M. Schott, David Atkinson, Simon R. Arridge, Brian F. Hutton, Pawel Markiewicz, Sebastien Ourselin
Faculty of Engineering and Information Sciences - Papers: Part A
Direct reconstruction of parametric images from raw photon counts has been shown to improve the quantitative analysis of dynamic positron emission tomography (PET) data. However it suffers from subject motion which is inevitable during the typical acquisition time of 1-2 hours. In this work we propose a framework to jointly estimate subject head motion and reconstruct the motion-corrected parametric images directly from raw PET data, so that the effects of distorted tissue-to-voxel mapping due to subject motion can be reduced in reconstructing the parametric images with motion-compensated attenuation correction and spatially aligned temporal PET data. The proposed approach is formulated …
Improvement Of Microstructure And Properties In Twin-Roll Casting 7075 Sheet By Lower Casting Speed And Compound Field, G Chen, Jintao Li, Z K. Yin, G M. Xu
Improvement Of Microstructure And Properties In Twin-Roll Casting 7075 Sheet By Lower Casting Speed And Compound Field, G Chen, Jintao Li, Z K. Yin, G M. Xu
Faculty of Engineering and Information Sciences - Papers: Part A
Well-developed dendrites and severe macro and micro segregations in 7075 sheet produced by horizontal twin-roll casting (TRC) deteriorates the hot-workability and properties of the sheet, which makes an obstacle for the successful use of this technology. In this paper, lower casting speed and a pulsed electric-magnetostatic compound field are used to refine microstructure and abate segregation in TRC 7075 sheet. The dendrite arm space decreases from 20 ¿m to 8¿13 ¿m and the micro-segregation degree of Mg, Zn and Cu decreases when casting speed decreases from 1.5 m/min to 0.75 m/min. The center macro-segregation belt disappears in the 0.75 m/min …
Real-Time In Vivo Rectal Wall Dosimetry Using Moskin Detectors During Linac Based Stereotactic Radiotherapy With Rectal Displacement, Kimberley Legge, Peter B. Greer, Daryl O'Connor, Lee Wilton, Matthew Richardson, Perry Hunter, Alex Wilfert, Jarad Martin, Anatoly B. Rosenfeld, Dean L. Cutajar
Real-Time In Vivo Rectal Wall Dosimetry Using Moskin Detectors During Linac Based Stereotactic Radiotherapy With Rectal Displacement, Kimberley Legge, Peter B. Greer, Daryl O'Connor, Lee Wilton, Matthew Richardson, Perry Hunter, Alex Wilfert, Jarad Martin, Anatoly B. Rosenfeld, Dean L. Cutajar
Faculty of Engineering and Information Sciences - Papers: Part A
Background: MOSFET dosimetry is a method that has been used to measure in-vivo doses during brachytherapy treatments and during linac based radiotherapy treatment. Rectal displacement devices (RDDs) allow for safe dose escalation for prostate cancer treatment. This study used dual MOSkin detectors to assess real-time in vivo rectal wall dose in patients with an RDD in place during a high dose prostate stereotactic body radiation therapy (SBRT) boost trial. Methods: The PROMETHEUS study commenced in 2014 and provides a prostate SBRT boost dose with a RDD in place. Twelve patients received two boost fractions of 9.5-10 Gy each delivered to …
Experimental And Modelling Approaches To The Determination Of Fatigue Crack Growth From A Structural Steel T-Butt Weld Toe, V. Tanulia, B. G. Prusty, G. M. Pearce, Alan K. Hellier, H. Li., M. Reid, A. M. Paradowska
Experimental And Modelling Approaches To The Determination Of Fatigue Crack Growth From A Structural Steel T-Butt Weld Toe, V. Tanulia, B. G. Prusty, G. M. Pearce, Alan K. Hellier, H. Li., M. Reid, A. M. Paradowska
Faculty of Engineering and Information Sciences - Papers: Part A
T-butt welded joints are found in many structural steel applications including buildings, bridges and offshore structures and are susceptible to fatigue crack initiation and propagation,which often leads ultimately to fast fracture failure. An example ofthis was the I-35W bridge in Minneapolis, which collapsed in 2007 resulting in 13 fatalities, as shown in Figure 1 [1]. The experimental work for this project was conducted using A350 grade black mild steel plate. An ultrasonic peening treatment was applied to one T-butt specimen to introduce compressive residual stress at the weld toe, in order to reduce the effective fatigue crack propagation rate. The …
Behavior Of Self-Compacting Concrete Columns Reinforced Longitudinally With Steel Tubes, Muhammad N. S Hadi, Faez Alhussainy, M Neaz Sheikh
Behavior Of Self-Compacting Concrete Columns Reinforced Longitudinally With Steel Tubes, Muhammad N. S Hadi, Faez Alhussainy, M Neaz Sheikh
Faculty of Engineering and Information Sciences - Papers: Part B
This study investigates the behavior of self-compacting concrete (SCC) specimens reinforced with small-diameter steel tubes in lieu of reinforcing bars. Twenty specimens were cast and tested. Four specimens were reinforced with normal steel bars (reference specimens) and the remaining 16 with steel tubes. All specimens contained steel helices with a pitch of either 50 mm or 75 mm. Deformed steel bars of 16-mm diameter were used in the four reference specimens as longitudinal reinforcement. Steel tubes of 33.7-mm outside diameter with 2-mm wall thickness (ST33.7) and steel tubes of 26.9-mm outside diameter with 2.6-mm wall thickness (ST26.9) were used as …
Behavior Of Circularized Hollow Rc Columns Under Different Loading Conditions, Muhammad N. S Hadi, Mohammed Jameel, M Neaz Sheikh
Behavior Of Circularized Hollow Rc Columns Under Different Loading Conditions, Muhammad N. S Hadi, Mohammed Jameel, M Neaz Sheikh
Faculty of Engineering and Information Sciences - Papers: Part B
One of the methods for strengthening square concrete columns is shape modification. The method involves modification of the column cross section from square to circular by bonding concrete segments and then wrapping the column with fiber reinforced polymer (FRP). This paper investigates experimentally the applicability of the shape modification (circularization) for square hollow reinforced concrete (RC) specimens under different loading conditions. Five groups of four hollow RC specimens made from normal strength concrete were cast and tested. The specimens in the first group were RC hollow specimens, which served as reference specimens. The corners of the specimens in the second …
A Graph-Embedding Approach To Hierarchical Visual Word Mergence, Lei Wang, Lingqiao Liu, Luping Zhou
A Graph-Embedding Approach To Hierarchical Visual Word Mergence, Lei Wang, Lingqiao Liu, Luping Zhou
Faculty of Engineering and Information Sciences - Papers: Part B
No abstract provided.
Design And Implementation Of A Novel Web-Based E-Learning Tool For Education Of Health Professionals On The Antibiotic Vancomycin, Stuart Bond, Shelley P. Crowther, Suman Adhikari, Ping Yu, Jay P. Bochard, Craig S. Boutlis, Wilfred W. Yeo, Spiros Miyakis
Design And Implementation Of A Novel Web-Based E-Learning Tool For Education Of Health Professionals On The Antibiotic Vancomycin, Stuart Bond, Shelley P. Crowther, Suman Adhikari, Ping Yu, Jay P. Bochard, Craig S. Boutlis, Wilfred W. Yeo, Spiros Miyakis
Faculty of Engineering and Information Sciences - Papers: Part B
No abstract provided.
Behaviour Of Circularized And Frp Wrapped Hollow Concrete Specimens Under Axial Compressive Load, Mohammed Jameel, M Neaz Sheikh, Muhammad N. S Hadi
Behaviour Of Circularized And Frp Wrapped Hollow Concrete Specimens Under Axial Compressive Load, Mohammed Jameel, M Neaz Sheikh, Muhammad N. S Hadi
Faculty of Engineering and Information Sciences - Papers: Part B
Circularizing a square column by bonding concrete segments onto the sides of the column and then wrapping with fibre reinforced polymer (FRP) is considered an effective technique in strengthening square solid columns. This paper investigates the suitability of the circularization technique for strengthening square hollow concrete specimens. Eight specimens in two groups (four solid specimens and four hollow specimens) were cast and tested under axial compression. The first specimen from each group was the reference specimen. The corners of the second specimen were rounded to 20 mm radius and wrapped with two layers of carbon fibre reinforced polymer (CFRP). The …
Integrated Condition Monitoring And Prognosis Method For Incipient Defect Detection And Remaining Life Prediction Of Low Speed Slew Bearings, Wahyu Caesarendra, Tegoeh Tjahjowidodo, Buyung Kosasih, Anh Kiet Tieu
Integrated Condition Monitoring And Prognosis Method For Incipient Defect Detection And Remaining Life Prediction Of Low Speed Slew Bearings, Wahyu Caesarendra, Tegoeh Tjahjowidodo, Buyung Kosasih, Anh Kiet Tieu
Faculty of Engineering and Information Sciences - Papers: Part B
This paper presents an application of multivariate state estimation technique (MSET), sequential probability ratio test (SPRT) and kernel regression for low speed slew bearing condition monitoring and prognosis. The method is applied in two steps. Step (1) is the detection of the incipient slew bearing defect. In this step, combined MSET and SPRT is used with circular-domain kurtosis, time-domain kurtosis, wavelet decomposition (WD) kurtosis, empirical mode decomposition (EMD) kurtosis and the largest Lyapunov exponent (LLE) feature. Step (2) is the prediction of the selected features' trends and the estimation of the remaining useful life (RUL) of the slew bearing. In …
Analytical Model For Vacuum Consolidation Incorporating Soil Disturbance Caused By Mandrel-Driven Drains, Darshana Perera, Buddhima Indraratna, Serge Leroueil, Cholachat Rujikiatkamjorn, Richard Kelly
Analytical Model For Vacuum Consolidation Incorporating Soil Disturbance Caused By Mandrel-Driven Drains, Darshana Perera, Buddhima Indraratna, Serge Leroueil, Cholachat Rujikiatkamjorn, Richard Kelly
Faculty of Engineering and Information Sciences - Papers: Part B
When vacuum preloading is applied with vertical drains, the rate of consolidation can be increased, and the stability of an embankment is enhanced due to the inward lateral movement. The aim of this study is to develop an analytical solution for vacuum preloading that accurately captures the more realistic variations in compressibility and permeability in actual ground conditions as a result of drain installation. The soil samples were obtained from various locations after drain installation to determine the characteristics of soil surrounding the vertical drain in terms of compressibility and permeability. The main differences between the proposed and conventional models …
Ultimate Tilt-Bearing Capacity Of Bolted Connections In Cold-Reduced Steel Sheets, Lip H. Teh, Mehmet Eren Uz
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 …
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
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 …