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Articles 331 - 360 of 2936
Full-Text Articles in Social and Behavioral Sciences
Development Of A Novel Phase Change Material Emulsion For Cooling Systems, Jingjing Shao, Jo Darkwa, Georgios Kokogiannakis
Development Of A Novel Phase Change Material Emulsion For Cooling Systems, Jingjing Shao, Jo Darkwa, Georgios Kokogiannakis
Faculty of Engineering and Information Sciences - Papers: Part A
In this paper, a novel phase change material emulsion (PCE-10) consisting of an organic PCM (RT10) and water has been developed. Its thermophysical properties such as heat of fusion, viscosity and sub-cooling temperature have been established. The chemical stability during both storage and discharge periods have also been evaluated. The results indicate low sub-cooling temperature and relatively long period of stability without any sign of segregation but the viscosity was found to be much higher than that of water.Further improvement and experimental studies into its flow characteristics are therefore being encouraged.
A Buckling Model For The Stability Design Of Steel Columns With Intermediate Gravity Loads, Lip H. Teh, Benoit P. Gilbert
A Buckling Model For The Stability Design Of Steel Columns With Intermediate Gravity Loads, Lip H. Teh, Benoit P. Gilbert
Faculty of Engineering and Information Sciences - Papers: Part A
This paper points out an accurate buckling model for determining the flexural effective length of a steel column subjected to intermediate gravity loads, for applications in the 2D second-order elastic analysis based design procedure. The proposed buckling model has "notional" horizontal restraints where equivalent horizontal forces have been applied, and can be readily programmed into a structural analysis/design software. Thirty columns having various end restraints and subjected to concentrated gravity loads within their unsupported lengths are analysed to demonstrate the merits of the proposed buckling model. It is shown that, in most of the cases analysed, the proposed buckling model …
Some Local Estimates And A Uniqueness Result For The Entire Biharmonic Heat Equation, Miles Simon, Glen Wheeler
Some Local Estimates And A Uniqueness Result For The Entire Biharmonic Heat Equation, Miles Simon, Glen Wheeler
Faculty of Engineering and Information Sciences - Papers: Part A
We consider smooth solutions to the biharmonic heat equation on ℝn x [0,T] for which the square of the Laplacian at time t is globally bounded from above by k0/t for some k0 in ℝ+, for all t ∈ [0,T]. We prove local, in space and time, estimates for such solutions. We explain how these estimates imply uniqueness of smooth solutions in this class.
A Review Of Protection Systems For Distribution Networks Embedded With Renewable Generation, Joel Kennedy, Philip Ciufo, Ashish P. Agalgaonkar
A Review Of Protection Systems For Distribution Networks Embedded With Renewable Generation, Joel Kennedy, Philip Ciufo, Ashish P. Agalgaonkar
Faculty of Engineering and Information Sciences - Papers: Part A
The rapid growth of grid-connected embedded generation is changing the operational characteristics of power distribution networks. Amongst a range of issues being reported in the research, the effect of these changes on so-called 'traditional protection systems' has not gone without attention. Looking to the future, the possibility of microgrid systems and deliberate islanding of sections of the network will require highly flexible distribution management systems and a re-design of protection strategies. This paper explores the envisaged protection issues concerned with large penetrations of embedded generation in distribution networks extending into auto-reclosure and protection device coordination. A critical review of recently …
The Moderating Impact Of Temporal Separation On The Association Between Intention And Physical Activity: A Meta-Analysis, Mairtin S. Mcdermott, Rajeev Sharma, Megan Andrews, Shahriar Akter, Donald Iverson, Peter Caputi, Tim Coltman, Murad Safadi
The Moderating Impact Of Temporal Separation On The Association Between Intention And Physical Activity: A Meta-Analysis, Mairtin S. Mcdermott, Rajeev Sharma, Megan Andrews, Shahriar Akter, Donald Iverson, Peter Caputi, Tim Coltman, Murad Safadi
Faculty of Engineering and Information Sciences - Papers: Part A
Previous meta-analyses have estimated that the intention-behaviour association in physical activity (PA) is large in magnitude. However, these prior meta-analyses have also revealed a large degree of heterogeneity, suggesting the presence of moderating variables. This study examines the impact of one such moderator, testing the hypothesis that the magnitude of the association between intention and behaviour decreases as the temporal separation between the two increases. A systematic literature search was used to identify published and unpublished studies that met the inclusion criteria. A random-effects meta-regression was conducted to test the study hypothesis. A total of 78 journal articles and 11 …
Mechanical Fatigue Performance Of Pcl-Chondroprogenitor Constructs After Cell Culture Under Bioreactor Mechanical Stimulus, J A. Panadero, Vitor Sencadas, Sonia C.M. Silva, Clarisse Ribeiro, Vítor Correia, F M. Gama, J L. Gomez Ribelles, Senentxu Lanceros-Méndez
Mechanical Fatigue Performance Of Pcl-Chondroprogenitor Constructs After Cell Culture Under Bioreactor Mechanical Stimulus, J A. Panadero, Vitor Sencadas, Sonia C.M. Silva, Clarisse Ribeiro, Vítor Correia, F M. Gama, J L. Gomez Ribelles, Senentxu Lanceros-Méndez
Faculty of Engineering and Information Sciences - Papers: Part A
In tissue engineering of cartilage, polymeric scaffolds are implanted in the damaged tissue and subjected to repeated compression loading cycles. The possibility of failure due to mechanical fatigue has not been properly addressed in these scaffolds. Nevertheless, the macroporous scaffold is susceptible to failure after repeated loading- unloading cycles. This is related to inherent discontinuities in the material due to the micropore structure of the macropore walls that act as stress concentration points. In this work, chondrogenic precursor cells have been seeded in poly-e-caprolactone (PCL) scaffolds with fibrin and some were submitted to free swelling culture and others to cyclic …
Comparison And Experiment Of Pressure Drop Of Radial And Annular Type Magnetorheological Valves, Guoliang Hu, Haiyan Li, Weihua Li
Comparison And Experiment Of Pressure Drop Of Radial And Annular Type Magnetorheological Valves, Guoliang Hu, Haiyan Li, Weihua Li
Faculty of Engineering and Information Sciences - Papers: Part A
The magnetorheological (MR) valve is a smart control mechanism using the magnetorheologcial fluid as the working fluid. The advantages of regulating pressure drop and fast response time make the valve have a promising application prospects in the hydraulic servo system, and the MR valve can also be used as a bypass valve to control the MR damper, which can be applied to the different types of vibration attenuating system. The change of pressure drop of MR valve considering radial and annular fluid flow paths was outlined through theory analysis, numerical simulation and experimental verification. The magnetized resistance gaps of both …
Msis 2016: A Comprehensive Update Of Graduate Level Curriculum Recommendation In Information Systems, Heikki Topi, Susan A. Brown, Joao Alvaro Carvalho, Brian Donnellan, Helena Karsten, Jun Shen, Bernard C. Y Tan, Mark F. Thouin
Msis 2016: A Comprehensive Update Of Graduate Level Curriculum Recommendation In Information Systems, Heikki Topi, Susan A. Brown, Joao Alvaro Carvalho, Brian Donnellan, Helena Karsten, Jun Shen, Bernard C. Y Tan, Mark F. Thouin
Faculty of Engineering and Information Sciences - Papers: Part A
The process to revise MSIS 2006, the master's level curriculum recommendation for Information Systems, is getting close to completion. In spring and summer 2016, the joint AIS/ACM task force will continue the process of soliciting comments from various stakeholders, including the academic IS community and employers. The purpose of the AMCIS panel is to give the audience an update of the status of the MSIS 2016 revision process and provide the task force with feedback regarding the draft document. A significant portion of the session will be reserved for conversation. The task force is proposing significant changes to the curriculum …
New Twist On Artificial Muscles, Carter S. Haines, Na Li, Geoffrey M. Spinks, Ali E. Aliev, Jiangtao Di, Ray H. Baughman
New Twist On Artificial Muscles, Carter S. Haines, Na Li, Geoffrey M. Spinks, Ali E. Aliev, Jiangtao Di, Ray H. Baughman
Faculty of Engineering and Information Sciences - Papers: Part A
Lightweight artificial muscle fibers that can match the large tensile stroke of natural muscles have been elusive. In particular, low stroke, limited cycle life, and inefficient energy conversion have combined with high cost and hysteretic performance to restrict practical use. In recent years, a new class of artificial muscles, based on highly twisted fibers, has emerged that can deliver more than 2,000 J/kg of specific work during muscle contraction, compared with just 40 J/kg for natural muscle. Thermally actuated muscles made from ordinary polymer fibers can deliver long-life, hysteresis-free tensile strokes of more than 30% and torsional actuation capable of …
Rhamnolipids Produced By Indigenous Acinetobacter Junii From Petroleum Reservoir And Its Potential In Enhanced Oil Recovery, Hao Dong, Wenjie Xia, Honghong Dong, Yuehui She, Panfeng Zhu, Kang Liang, Zhongzhi Zhang, Chuanfu Liang, Zhaozheng Song, Shanshan Sun, Guangqing Zhang
Rhamnolipids Produced By Indigenous Acinetobacter Junii From Petroleum Reservoir And Its Potential In Enhanced Oil Recovery, Hao Dong, Wenjie Xia, Honghong Dong, Yuehui She, Panfeng Zhu, Kang Liang, Zhongzhi Zhang, Chuanfu Liang, Zhaozheng Song, Shanshan Sun, Guangqing Zhang
Faculty of Engineering and Information Sciences - Papers: Part A
Biosurfactant producers are crucial for incremental oil production in microbial enhanced oil recovery (MEOR) processes. The isolation of biosurfactant-producing bacteria from oil reservoirs is important because they are considered suitable for the extreme conditions of the reservoir. In this work, a novel biosurfactant-producing strain Acinetobacter junii BD was isolated from a reservoir to reduce surface tension and emulsify crude oil. The biosurfactants produced by the strain were purified and then identified via electrospray ionization-Fourier transform ion cyclotron resonance mass spectrometry (ESI FT-ICR-MS). The biosurfactants generated by the strain were concluded to be rhamnolipids, the dominant rhamnolipids were C26H …
A Novel Viscoelastic-Based Ferrofluid For Continuous Sheathless Microfluidic Separation Of Nonmagnetic Microparticles, Jun Zhang, Sheng Yan, Dan Yuan, Qianbin Zhao, Say H. Tan, Nam-Trung Nguyen, Weihua Li
A Novel Viscoelastic-Based Ferrofluid For Continuous Sheathless Microfluidic Separation Of Nonmagnetic Microparticles, Jun Zhang, Sheng Yan, Dan Yuan, Qianbin Zhao, Say H. Tan, Nam-Trung Nguyen, Weihua Li
Faculty of Engineering and Information Sciences - Papers: Part A
Separation of microparticles has found broad applications in biomedicine, industry and clinical diagnosis. In a conventional aqueous ferrofluid, separation of microparticles usually employs a sheath flow or two offset magnets to confine particle streams for downstream particle sorting. This complicates the fluid control, device fabrication, and dilutes the particle sample. In this work, we propose and develop a novel viscoelastic ferrofluid by replacing the Newtonian base medium of the conventional ferrofluid with non-Newtonian poly(ethylene oxide) (PEO) aqueous solution. The properties of both viscoelastic 3D focusing and negative magnetophoresis of the viscoelastic ferrofluid were verified and investigated. By employing the both …
Building A Microsimulation Model Of Heroin Use Careers In Australia, Alison Ritter, Nagesh Shukla, Marian D. Shanahan, Van Hoang Phuong, Vu Lam Cao, Pascal Perez, Michael P. Farrell
Building A Microsimulation Model Of Heroin Use Careers In Australia, Alison Ritter, Nagesh Shukla, Marian D. Shanahan, Van Hoang Phuong, Vu Lam Cao, Pascal Perez, Michael P. Farrell
Faculty of Engineering and Information Sciences - Papers: Part A
Illicit heroin use is a worldwide problem, with significant health and social costs. Treatment is known to be effective in changing heroin use habits, but it often needs to be provided over a lifetime, with people cycling in and out of treatment. It is therefore important to capture a long-term perspective on heroin use careers. The aim of this project was to build a lifetime microsimulation model of heroin using careers. This paper describes the conceptual logic of the model, the input parameters and the verification and validation results. A microsimulation model was chosen as the most appropriate simulation platform …
High-Throughput, Sheathless, Magnetophoretic Separation Of Magnetic And Non-Magnetic Particles With A Groove-Based Channel, Sheng Yan, Jie Zhang, Dan Yuan, Qianbin Zhao, J Ma, Weihua Li
High-Throughput, Sheathless, Magnetophoretic Separation Of Magnetic And Non-Magnetic Particles With A Groove-Based Channel, Sheng Yan, Jie Zhang, Dan Yuan, Qianbin Zhao, J Ma, Weihua Li
Faculty of Engineering and Information Sciences - Papers: Part A
The separation of target objects conjugated with magnetic particles is a significant application in biomedicine and clinical diagnosis. Conventional magnetophoresis-based devices use a sheath flow to pre-focus the particles into a single stream and typically operate at a low flow rate. We demonstrate in this work a high-throughput, sheathless, magnetophoretic separation of magnetic and non-magnetic beads in a groove-based channel, and also report on an interesting phenomenon where the same magnetic beads in the same microchannel, but with different setups, has a different particle tracing; a binary mixture of magnetic and non-magnetic beads in a diluted ferrofluid, is then fed …
On The Index Of A Non-Fredholm Model Operator, Alan L. Carey, Fritz Gesztesy, Galina Levitina, F Sukochev
On The Index Of A Non-Fredholm Model Operator, Alan L. Carey, Fritz Gesztesy, Galina Levitina, F Sukochev
Faculty of Engineering and Information Sciences - Papers: Part A
Let {A(t)}t∈R be a path of self-adjoint Fredholm operators in a Hilbert space H , joining endpoints A± as t → ±∞. Computing the index of the operator DA = ∂ /∂ t + A acting on L2(R;H ), where A denotes the multiplication operator (A f)(t) = A(t) f (t) for f ∈ L2(R;H ) , and its relation to spectral flow along this path, has a long history, but it is mostly focussed on the case where the operators A(t) all have purely discrete spectrum.
Video Enhanced Multiple Choice Questions - Personalising Elearning, Nadine Adams, Anne L. Porter
Video Enhanced Multiple Choice Questions - Personalising Elearning, Nadine Adams, Anne L. Porter
Faculty of Engineering and Information Sciences - Papers: Part A
Instructional videos have been successfully used to teach mathematical concepts to distance students. These videos allow the students to see and hear their lecturer with an added advantage of being able to stop and rewind or replay until the concept is understood. While videos facilitate student understanding, formative assessment provides both lecturer and student with an indication of the latter's mastery of a mathematical concept. Formative assessment with handwritten feedback is viewed as preferential because changing university culture means few academics have the time to provide comprehensive handwritten feedback to large numbers of students for every concept. Further, for this …
Evaluation Of Dose From Kv Cone-Beam Computed Tomography During Radiotherapy: A Comparison Of Methodologies, Jarryd Buckley, Dean Wilkinson, Alessandra Malaroda, Peter E. Metcalfe
Evaluation Of Dose From Kv Cone-Beam Computed Tomography During Radiotherapy: A Comparison Of Methodologies, Jarryd Buckley, Dean Wilkinson, Alessandra Malaroda, Peter E. Metcalfe
Faculty of Engineering and Information Sciences - Papers: Part A
Three alternative methodologies to the Computed-Tomography Dose Index for the evaluation of Cone-Beam Computed Tomography dose are compared, the Cone-Beam Dose Index, IAEA Human Health Report No. 5 recommended methodology and the AAPM Task Group 111 recommended methodology. The protocols were evaluated for Pelvis and Thorax scan modes on Varian® On-Board Imager and Truebeam kV XI imaging systems. The weighted planar average dose was highest for the AAPM methodology across all scans, with the CBDI being the second highest overall. A 17.96% and 1.14% decrease from the TG-111 protocol to the IAEA and CBDI protocols for the Pelvis mode and …
Response Of Static And Cyclic Laterally Loaded Rigid Piles In Sand, Hongyu Qin, Wei Dong Guo
Response Of Static And Cyclic Laterally Loaded Rigid Piles In Sand, Hongyu Qin, Wei Dong Guo
Faculty of Engineering and Information Sciences - Papers: Part A
An experimental investigation was made into response of piles in sand subjected to lateral cyclic loading. Seven instrumented model piles were tested individually. Five tests were conducted under typical magnitude, and number of cycle loading, and two were under static loading. The results were used to deduce modulus of subgrade reaction k and the profile of limiting lateral resistance force per unit length (LFP, pu profile) in light of closed-form solutions. The study demonstrates a large impact of lateral (cyclic) load level than on the number of cycles, a 1.5-2.8 times increase in the modulus k, and a 10% reduction …
A Short Id-Based Proxy Signature Scheme, Maryam Rjabzadeh Asaar, Mahmoud Salmasizadeh, Willy Susilo
A Short Id-Based Proxy Signature Scheme, Maryam Rjabzadeh Asaar, Mahmoud Salmasizadeh, Willy Susilo
Faculty of Engineering and Information Sciences - Papers: Part A
No abstract provided.
Analysis Of The Magnetic Torque On A Tilted Permanent Magnet For Drug Delivery In Capsule Robots, Fredy Munoz, Gursel Alici, Hao Zhou, Weihua Li, Metin Sitti
Analysis Of The Magnetic Torque On A Tilted Permanent Magnet For Drug Delivery In Capsule Robots, Fredy Munoz, Gursel Alici, Hao Zhou, Weihua Li, Metin Sitti
Faculty of Engineering and Information Sciences - Papers: Part A
In this paper, we present the analysis of the torque transmitted to a tilted permanent magnet that is to be embedded in a capsule robot to achieve targeted drug delivery. This analysis is carried out by using an analytical model and experimental results for a small cubic permanent magnet that is driven by an external magnetic system made of an array of arc-shaped permanent magnets (ASMs). Our experimental results, which are in agreement with the analytical results, show that the cubic permanent magnet can safely be actuated for inclinations lower than 75° without having to make positional adjustments in the …
Asl-Incorporated Pharmacokinetic Modelling Of Pet Data With Reduced Acquisition Time: Application To Amyloid Imaging, Catherine L. Scott, Jieqing Jiao, Andrew Melbourne, Jonathan M. Schott, Brian F. Hutton, Sebastien Ourselin
Asl-Incorporated Pharmacokinetic Modelling Of Pet Data With Reduced Acquisition Time: Application To Amyloid Imaging, Catherine L. Scott, Jieqing Jiao, Andrew Melbourne, Jonathan M. Schott, Brian F. Hutton, Sebastien Ourselin
Faculty of Engineering and Information Sciences - Papers: Part A
Pharmacokinetic analysis of Positron Emission Tomography (PET) data typically requires at least one hour of image acquisition, which poses a great disadvantage in clinical practice. In this work, we propose a novel approach for pharmacokinetic modelling with significantly reduced PET acquisition time, by incorporating the blood flow information from simultaneously acquired arterial spin labelling (ASL) magnetic resonance imaging (MRI). A relationship is established between blood flow, measured by ASL, and the transfer rate constant from plasma to tissue of the PET tracer, leading to modified PET kinetic models with ASL-derived flow information. Evaluation on clinical amyloid imaging data from an …
The Effect Of Aging On Thermomechanical And Metal Extraction Properties Of Poly (Vinyl Chloride)/Aliquat 336 Polymer Inclusion Membranes, Nurul Syazana Binti Abdul Halim, Philip G. Whitten, Long D. Nghiem
The Effect Of Aging On Thermomechanical And Metal Extraction Properties Of Poly (Vinyl Chloride)/Aliquat 336 Polymer Inclusion Membranes, Nurul Syazana Binti Abdul Halim, Philip G. Whitten, Long D. Nghiem
Faculty of Engineering and Information Sciences - Papers: Part A
The impact of aging PVC/Aliquat 336 polymer inclusion membranes (PIMs) on their thermomechanical properties and heavy metal extraction performance was investigated. The results show that freshly prepared PIMs contain residual tetrahydrofuran (THF) which was used as the solvent for membrane manufacture. Removal of some residual THF by membrane aging resulted in notable changes in the thermomechanical properties of the PIMs. By aging the membrane for 1 week at 40°C, the glass transition increased from 42 to 55°C. In addition, while the melting temperature (Tm) of the Aliquat 336 component could not be determined for freshly prepared PIMs, the aged membrane …
An Experimental And Numerical Investigation On Micro Rolling For Ultra-Thin Strip, Haibo Xie, Kenichi Manabe, Tsuyoshi Furushima, Kazuo Tada, Zhengyi Jiang
An Experimental And Numerical Investigation On Micro Rolling For Ultra-Thin Strip, Haibo Xie, Kenichi Manabe, Tsuyoshi Furushima, Kazuo Tada, Zhengyi Jiang
Faculty of Engineering and Information Sciences - Papers: Part A
The demand for miniaturized parts and miniaturized semi-finished products is increasing nowadays, because microforming processes can improve production rate and minimize material waste due to less forming passes. However, traditional macro metal forming processes and modelling cannot be simply scaled down to produce miniaturized micro parts. In this study, a 2-Hi micro rolling mill has been successfully built. Experimental and numerical investigations on the micro rolling process for ultra-thin SUS 304 stainless steel strip have been conducted. The experimental results show that the micro rolling deformation of ultra-thin strip is influenced by size effect which results from the specimen size …
Antenna Selection Strategies For Mimo-Ofdm Wireless Systems: An Energy-Efficiency Perspective, Ngoc Phuc Le, Farzad Safaei, Le Chung Tran
Antenna Selection Strategies For Mimo-Ofdm Wireless Systems: An Energy-Efficiency Perspective, Ngoc Phuc Le, Farzad Safaei, Le Chung Tran
Faculty of Engineering and Information Sciences - Papers: Part A
In this paper, we investigate antenna selection strategies for MIMO-OFDM wireless systems from an energy efficiency perspective. We first derive closed-form expressions of the energy efficiency and the energy efficiency- spectral efficiency (EE-SE) trade-off in conventional antenna selection MIMO-OFDM systems. The obtained results show that these systems suffer from a significant loss in energy efficiency. To achieve a better energy-efficiency performance, we propose an adaptive antenna selection method where both the number of active RF (radio frequency) chains and the antenna indices are selected depending on the channel condition. This selection scheme could be implemented by an exhaustive search technique …
Phosphorus And Water Recovery By A Novel Osmotic Membrane Bioreactor - Reverse Osmosis System, Wenhai Luo, Faisal I. Hai, William E. Price, Wenshan Guo, Hao H. Ngo, Kazuo Yamamoto, Long D. Nghiem
Phosphorus And Water Recovery By A Novel Osmotic Membrane Bioreactor - Reverse Osmosis System, Wenhai Luo, Faisal I. Hai, William E. Price, Wenshan Guo, Hao H. Ngo, Kazuo Yamamoto, Long D. Nghiem
Faculty of Engineering and Information Sciences - Papers: Part A
An osmotic membrane bioreactor-reverse osmosis (OMBR-RO) hybrid system integrated with periodic microfiltration (MF) extraction was evaluated for simultaneous phosphorus and clean water recovery from raw sewage. In this hybrid system, the forward osmosis membrane effectively retained inorganic salts and phosphate in the bioreactor, while the MF membrane periodically bled them out for phosphorus recovery with pH adjustment. The RO process was used for draw solute recovery and clean water production. Results show that phosphorus recuperation from the MF permeate was most effective when the solution pH was adjusted to 10, whereby the recovered precipitate contained 15-20% (wt/wt) of phosphorus. Periodic …
Effects Of Salinity Build-Up On The Performance And Bacterial Community Structure Of A Membrane Bioreactor, Wenhai Luo, Hop V. Phan, Faisal I. Hai, William E. Price, Wenshan Guo, Hao H. Ngo, Kazuo Yamamoto, Long D. Nghiem
Effects Of Salinity Build-Up On The Performance And Bacterial Community Structure Of A Membrane Bioreactor, Wenhai Luo, Hop V. Phan, Faisal I. Hai, William E. Price, Wenshan Guo, Hao H. Ngo, Kazuo Yamamoto, Long D. Nghiem
Faculty of Engineering and Information Sciences - Papers: Part A
This study investigated the effects of salinity increase on bacterial community structure in a membrane bioreactor (MBR) for wastewater treatment. The influent salt loading was increased gradually to simulate salinity build-up in the bioreactor during the operation of a high retention-membrane bioreactor (HR-MBR). Bacterial community diversity and structure were analyzed using 454 pyrosequencing of 16S rRNA genes of MBR mixed liquor samples. Results show that salinity increase reduced biological performance but did not affect microbial diversity in the bioreactor. Unweighted UniFrac and taxonomic analyses were conducted to relate the reduced biological performance to the change of bacterial community structure. In …
Analytical Solution For Interaction Forces In Beams Strengthened With Near-Surface Mounted Round Bars, Shi Shun Zhang, Tao Yu
Analytical Solution For Interaction Forces In Beams Strengthened With Near-Surface Mounted Round Bars, Shi Shun Zhang, Tao Yu
Faculty of Engineering and Information Sciences - Papers: Part A
The use of near-surface mounted (NSM) FRP composites for strengthening RC beams in flexure has become increasingly popular in the last decade. Compared to the externally bonded (EB) FRP strengthening method, the bond between FRP and concrete is much stronger when the NSM FRP strengthening method is used. However, debonding is still a likely failure mode in RC members strengthened with NSM FRP bars. The debonding in an NSM FRP-strengthened beam may initiate from either of the two ends of an NSM bar (i.e. end debonding) in the form of interfacial debonding or concrete cover separation, both of which are …
Three-Dimensional Nonlinear Global Dynamics Of Axially Moving Viscoelastic Beams, Hamed Farokhi, Mergen H. Ghayesh, Shahid Hussain
Three-Dimensional Nonlinear Global Dynamics Of Axially Moving Viscoelastic Beams, Hamed Farokhi, Mergen H. Ghayesh, Shahid Hussain
Faculty of Engineering and Information Sciences - Papers: Part A
The three-dimensional nonlinear global dynamics of an axially moving viscoelastic beam is investigated numerically, retaining longitudinal, transverse, and lateral displacements and inertia. The nonlinear continuous model governing the motion of the system is obtained by means of Hamilton's principle. The Galerkin scheme along with suitable eigenfunctions is employed for model reduction. Direct time-integration is conducted upon the reduced-order model yielding the time-varying generalized coordinates. From the time histories of the generalized coordinates, the bifurcation diagrams of Poincaré sections are constructed by varying either the forcing amplitude or the axial speed as the bifurcation parameter. The results for the three-dimensional viscoelastic …
A Magnetically Actuated Drug Delivery System For Robotic Endoscopic Capsules, Fredy Munoz, Gursel Alici, Weihua Li
A Magnetically Actuated Drug Delivery System For Robotic Endoscopic Capsules, Fredy Munoz, Gursel Alici, Weihua Li
Faculty of Engineering and Information Sciences - Papers: Part A
There is an increasing need to incorporate an actively controlled drug delivery system (DDS) into the next generation of capsule endoscopy in order to treat diseases in the gastrointestinal tract in a noninvasive way. Despite a number of attempts to magnetically actuate drug delivery mechanisms embedded in endoscopic capsules, longer operating distances and further miniaturization of on-board components are still drawbacks of such systems. In this paper, we propose an innovative magnetic system that consists of an array of magnets, which activates a DDS, based on an overly miniaturized slider-crank mechanism. We use analytical models to compare the magnetic fields …
Analysis Of Micro Flexible Rolling With Consideration Of Material Heterogeneity, Feijun Qu, Zhengyi Jiang, Haina Lu
Analysis Of Micro Flexible Rolling With Consideration Of Material Heterogeneity, Feijun Qu, Zhengyi Jiang, Haina Lu
Faculty of Engineering and Information Sciences - Papers: Part A
This paper establishes a finite element model to numerically study the springback in thickness direction during micro flexible rolling process, in which 3D Voronoi tessellation has been applied to describe grain boundary and generation process of grain in the workpiece. To reflect material heterogeneity, nine kinds of mechanical properties defined by nine types of heterogeneity coefficients are selected and assigned to Voronoi polyhedrons as per the statistical distribution of hardness of grains identified by micro hardness testing. Initial workpiece thicknesses of 100, 250 and 500 μm with reduction changing from 20% to 50% are respectively considered in the numerical simulation …
Acetylated Bacterial Cellulose Coated With Urinary Bladder Matrix As A Substrate For Retinal Pigment Epithelium, Sara Goncalves, Ines P. Rodrigues, J Padrão, J P. Silva, Vitor Sencadas, Senentxu Lanceros-Méndez, Henrique Girao, F M. Gama, F Dourado, L R. Rodrigues
Acetylated Bacterial Cellulose Coated With Urinary Bladder Matrix As A Substrate For Retinal Pigment Epithelium, Sara Goncalves, Ines P. Rodrigues, J Padrão, J P. Silva, Vitor Sencadas, Senentxu Lanceros-Méndez, Henrique Girao, F M. Gama, F Dourado, L R. Rodrigues
Faculty of Engineering and Information Sciences - Papers: Part A
This work evaluated the effect of acetylated bacterial cellulose (ABC) substrates coated with urinary bladder matrix (UBM) on the behavior of retinal pigment epithelium (RPE), as assessed by cell adhesion, proliferation and development of cell polarity exhibiting transepithelial resistance and polygonal shaped-cells with microvilli. Acetylation of bacterial cellulose (BC) generated a moderate hydrophobic surface (around 65°) while the adsorption of UBM onto these acetylated substrates did not affect significantly the surface hydrophobicity. The ABS substrates coated with UBM enabled the development of a cell phenotype closer to that of native RPE cells. These cells were able to express proteins essential …