Open Access. Powered by Scholars. Published by Universities.®
Social and Behavioral Sciences Commons™
Open Access. Powered by Scholars. Published by Universities.®
- Keyword
-
- Analysis (124)
- Steel (99)
- Systems (98)
- Study (94)
- System (94)
-
- Model (91)
- High (77)
- Energy (75)
- Effect (73)
- Performance (68)
- Method (63)
- Approach (61)
- Design (60)
- During (59)
- Networks (58)
- Control (57)
- Data (56)
- Properties (54)
- Effects (53)
- Development (52)
- Multi (51)
- Power (51)
- Under (51)
- Low (50)
- Behaviour (48)
- Process (47)
- Concrete (46)
- Novel (46)
- Algebras (45)
- Distribution (45)
- Publication Year
- File Type
Articles 1231 - 1260 of 2936
Full-Text Articles in Social and Behavioral Sciences
Multi-Polarization Through-The-Wall Radar Imaging Using Joint Bayesian Compressed Sensing, Abdesselam Bouzerdoum, Fok Hing Chi Tivive, Van Ha Tang
Multi-Polarization Through-The-Wall Radar Imaging Using Joint Bayesian Compressed Sensing, Abdesselam Bouzerdoum, Fok Hing Chi Tivive, Van Ha Tang
Faculty of Engineering and Information Sciences - Papers: Part A
This paper presents a new image formation method for multi-polarization through-the-wall radar imaging. The proposed method combines wall clutter mitigation and scene reconstruction in a unified framework using multitask Bayesian compressed sensing. First, the radar signals are jointly recovered using Bayesian compressed sensing in the wavelet domain. Then, a subspace projection method is employed to mitigate the front wall reflections. This is followed by principal component analysis, which is used to compress the remaining wavelet coefficients and remove noise. A linear model is developed which relates the compressed wavelet coefficients directly to the image of the scene. For scene reconstruction, …
Group Self-Build Housing: The Potential To Deliver Zero Carbon Homes, Emma Elizabeth Heffernan, Wei Pan, Xi Liang, Pieter De Wilde
Group Self-Build Housing: The Potential To Deliver Zero Carbon Homes, Emma Elizabeth Heffernan, Wei Pan, Xi Liang, Pieter De Wilde
Faculty of Engineering and Information Sciences - Papers: Part A
The UK Government has stated that self-build homes are likely to be more affordable, energy efficient and innovative than standard market housing. However, there is little academic research to support these assertions. In addressing this gap in knowledge, this paper reviews the literature relating to the pros and cons of self-build housing, with a focus on energy efficiency. The paper explores expert opinions on the suitability of self-build housing as a development model for the delivery of zero carbon homes. The research employed a Policy Delphi study using three rounds of questionnaire surveys to gather data iteratively from a heterogeneous …
Ontological Meta-Analysis And Synthesis Of Hipaa, Arkalgud Ramaprasad, Thant Syn, Khin Than Win
Ontological Meta-Analysis And Synthesis Of Hipaa, Arkalgud Ramaprasad, Thant Syn, Khin Than Win
Faculty of Engineering and Information Sciences - Papers: Part A
We present ontological meta-analysis and synthesis of HIPAA (Health Insurance Portability and Accountability Act) as a method for reviewing, mapping, and visualizing the research literature in the domain cumulatively, logically, systematically, and systemically. The method will highlight the domain's bright spots which are heavily emphasized, the light spots which are lightly emphasized, the blind spots which have been overlooked, and the blank spots which may never be emphasized. It will highlight the biases and asymmetries in the domain's research; the research can then be realigned to make it stronger and more effective. We present an ontology for HIPAA, map the …
Variation Of Poincare Recurrence Times In Discrete Dynamical Systems, Mimoon Ismael, Rodney Nillsen, Graham H. Williams
Variation Of Poincare Recurrence Times In Discrete Dynamical Systems, Mimoon Ismael, Rodney Nillsen, Graham H. Williams
Faculty of Engineering and Information Sciences - Papers: Part A
This paper is concerned with the variation and standard deviation of recurrence times in discrete dynamical systems.
Learning Diagnostic Diagrams In Transport-Based Data-Collection Systems, Vu Tran, Peter W. Eklund, Christopher David Cook
Learning Diagnostic Diagrams In Transport-Based Data-Collection Systems, Vu Tran, Peter W. Eklund, Christopher David Cook
Faculty of Engineering and Information Sciences - Papers: Part A
Insights about service improvement in a transit network can be gained by studying transit service reliability. In this paper, a general procedure for constructing a transit service reliability diagnostic (Tsrd) diagram based on a Bayesian network is proposed to automatically build a behavioural model from Automatic Vehicle Location (AVL) and Automatic Passenger Counters (APC) data. Our purpose is to discover the variability of transit service attributes and their effects on traveller behaviour. A Tsrd diagram describes and helps to analyse factors affecting public transport by combining domain knowledge with statistical data.
Progressive Mode-Seeking On Graphs For Sparse Feature Matching, Chao Wang, Lei Wang, Lingqiao Liu
Progressive Mode-Seeking On Graphs For Sparse Feature Matching, Chao Wang, Lei Wang, Lingqiao Liu
Faculty of Engineering and Information Sciences - Papers: Part A
Sparse feature matching poses three challenges to graph-based methods: (1) the combinatorial nature makes the number of possible matches huge; (2) most possible matches might be outliers; (3) high computational complexity is often incurred. In this paper, to resolve these issues, we propose a simple, yet surprisingly effective approach to explore the huge matching space in order to significantly boost true matches while avoiding outliers. The key idea is to perform mode-seeking on graphs progressively based on our proposed guided graph density. We further design a density-aware sampling technique to considerably accelerate mode-seeking. Experimental study on various benchmark data sets …
Rapid Assessment Of Bilateral Cochlear Implantation For Children In Kazakhstan, Lyazzat Kosherbayeva, David M. Hailey, Laura Kozhageldiyeva
Rapid Assessment Of Bilateral Cochlear Implantation For Children In Kazakhstan, Lyazzat Kosherbayeva, David M. Hailey, Laura Kozhageldiyeva
Faculty of Engineering and Information Sciences - Papers: Part A
Objectives: The aim of this study was to evaluate the effectiveness of bilateral cochlear implantation (CI) compared with unilateral CI for deaf children in the context of the Republic of Kazakhstan health system. Methods. A literature search was conducted, using the PubMed, Cochrane, and Embase data bases for studies that compared the effectiveness of bilateral and unilateral CI in children. The search included English language, publications from 2002-2012. Two reviewers independently evaluated all relevant studies. Administrative data relevant to CI in Kazakhstan were obtained from the Ministry of Health. Results: Three relevant systematic reviews and an health technology assessment report …
Silicon Strip Detector For Quality Assurance In Synchrotron Microbeam Radiation Therapy, Pauline Fournier, Iwan Cornelius, Marco Petasecca, Elke Brauer-Krisch, Herwig Requardt, Andrew Dipuglia, N Roberts, Christopher Hall, Andrew W. Stevenson, Anatoly B. Rosenfeld
Silicon Strip Detector For Quality Assurance In Synchrotron Microbeam Radiation Therapy, Pauline Fournier, Iwan Cornelius, Marco Petasecca, Elke Brauer-Krisch, Herwig Requardt, Andrew Dipuglia, N Roberts, Christopher Hall, Andrew W. Stevenson, Anatoly B. Rosenfeld
Faculty of Engineering and Information Sciences - Papers: Part A
Abstract of an oral communication that presented at the 53es Journées Scientifiques de la Société Française de Physique Médicale, 4-6 June 2014, Deauville, France.
Nonlinear Response Of Laterally Loaded Rigid Piles In Sand, Hongyu Qin, Wei Dong Guo
Nonlinear Response Of Laterally Loaded Rigid Piles In Sand, Hongyu Qin, Wei Dong Guo
Faculty of Engineering and Information Sciences - Papers: Part A
This paper investigates nonlinear response of 51 laterally loaded rigid piles in sand. Measured response of each pile test was used to deduce input parameters of modulus of subgrade reaction and the gradient of the linear limiting force profile using elastic-plastic solutions. Normalised load - displacement and/or moment - rotation curves and in some cases bending moment and displacement distributions with depth are provided for all the pile tests, to show the effect of load eccentricity on the nonlinear pile response and pile capacity. The values of modulus of subgrade reaction and the gradient of the linear limiting force profile …
Performance Based Seismic Assessment Of Bridges Designed According To Canadian Highway Bridge Design Code, M Neaz Sheikh, Frederic Legeron
Performance Based Seismic Assessment Of Bridges Designed According To Canadian Highway Bridge Design Code, M Neaz Sheikh, Frederic Legeron
Faculty of Engineering and Information Sciences - Papers: Part A
Recent research efforts have focused on the development of performance based seismic design methodologies for structures. However, the seismic design rules prescribed in the current Canadian Highway Bridge Design Code (CHBDC) is based largely on force based design principles. Although a set of performance requirements (performance objectives) for different return period earthquake events have been specified, there is no explicit requirement in the CHBDC to check the attainment of such performance objectives for the designed bridges. Also, no engineering parameters have been assigned to the specified performance objectives. This paper correlates seismic performance objectives (both qualitative and quantitative) with engineering …
Multiple Kernel Learning In The Primal For Multimodal Alzheimer's Disease Classification, Fayao Liu, Luping Zhou, Chunhua Shen, Jianping Yin
Multiple Kernel Learning In The Primal For Multimodal Alzheimer's Disease Classification, Fayao Liu, Luping Zhou, Chunhua Shen, Jianping Yin
Faculty of Engineering and Information Sciences - Papers: Part A
To achieve effective and efficient detection of Alzheimer's disease (AD), many machine learning methods have been introduced into this realm. However, the general case of limited training samples, as well as different feature representations typically makes this problem challenging. In this work, we propose a novel multiple kernel learning framework to combine multi-modal features for AD classification, which is scalable and easy to implement. Contrary to the usual way of solving the problem in the dual, we look at the optimization from a new perspective. By conducting Fourier transform on the Gaussian kernel, we explicitly compute the mapping function, which …
Towards A Cryptographic Treatment Of Publish/Subscribe Systems, Tsz Hon Yuen, Willy Susilo, Yi Mu
Towards A Cryptographic Treatment Of Publish/Subscribe Systems, Tsz Hon Yuen, Willy Susilo, Yi Mu
Faculty of Engineering and Information Sciences - Papers: Part A
Publish/subscribe mechanism is a typical many-to-many messaging paradigm when multiple applications want to receive the same message or when a group of applications would like to notify each other. Nonetheless, there exist only a few works that address the security issues for content-based publish/subscribe systems formally. Although the security requirements have been partially addressed by Wang et al., there is no formal definition for all of these security requirements in the literature. As a result, most of the existing schemes do not have any security proof and it is difficult to justify whether those schemes are really secure in practice. …
Attribute-Based Signature With Message Recovery, Kefeng Wang, Yi Mu, Fuchun Guo
Attribute-Based Signature With Message Recovery, Kefeng Wang, Yi Mu, Fuchun Guo
Faculty of Engineering and Information Sciences - Papers: Part A
We present a new notion called the attribute-based signa- ture with message recovery. Compared with the existing attribute-based signature schemes, an attribute-based signature with message recovery scheme does not require transmission of the original message to verify the validity of the signature, since the original message can be recovered from the signature. Therefore, this scheme shortens the total length of the original message and the appended attribute-based signature. The contributions of this paper are threefold. First, we introduce the notion of attribute-based signature with message recovery. Second, we present a concrete construction of an attribute-based signature with message re- covery …
Hep-2 Cell Image Classification With Multiple Linear Descriptors, Lingqiao Liu, Lei Wang
Hep-2 Cell Image Classification With Multiple Linear Descriptors, Lingqiao Liu, Lei Wang
Faculty of Engineering and Information Sciences - Papers: Part A
The automatic classification of the HEp-2 cell stain patterns from indirect immunofluorescence images has attracted much attention recently. As an image classification problem, it can be well solved by the state-of-the-art bag-of-features (BoF) model as long as a suitable local descriptor is known. Unfortunately, for this special task, we have very limited knowledge of such a descriptor. In this paper, we explore the possibility of automatically learning the descriptor from the image data itself. Specifically, we assume that a local patch can be well described by a set of linear projections performed on its pixel values. Based on this assumption, …
On The Security Of Text-Based 3d Captchas, Vu Duc Nguyen, Yang-Wai Chow, Willy Susilo
On The Security Of Text-Based 3d Captchas, Vu Duc Nguyen, Yang-Wai Chow, Willy Susilo
Faculty of Engineering and Information Sciences - Papers: Part A
CAPTCHAs have become a standard security mechanism that are used to deter automated abuse of online services intended for humans. However, many existing CAPTCHA schemes to date have been successfully broken. As such, a number of CAPTCHA developers have explored alternative methods of designing CAPTCHAs. 3D CAPTCHAs is a design alternative that has been proposed to overcome the limitations of traditional CAPTCHAs. These CAPTCHAs are designed to capitalize on the human visual system's natural ability to perceive 3D objects from an image. The underlying security assumption is that it is difficult for a computer program to identify the 3D content. …
Cross-Domain Password-Based Authenticated Key Exchange Revisited, Liqun Chen, Hoon Wei Lim, Guomin Yang
Cross-Domain Password-Based Authenticated Key Exchange Revisited, Liqun Chen, Hoon Wei Lim, Guomin Yang
Faculty of Engineering and Information Sciences - Papers: Part A
We revisit the problem of secure cross-domain communication between two users belonging to different security domains within an open and distributed environment. Existing approaches presuppose that either the users are in possession of public key certificates issued by a trusted certificate authority (CA), or the associated domain authentication servers share a long-term secret key. In this article, we propose a generic framework for designing four-party password-based authenticated key exchange (4PAKE) protocols. Our framework takes a different approach from previous work. The users are not required to have public key certificates, but they simply reuse their login passwords, which they share …
New Insight To Preserve Online Survey Accuracy And Privacy In Big Data Era, Joseph K. Liu, Man Ho Au, Xinyi Huang, Willy Susilo, Jianying Zhou, Yong Yu
New Insight To Preserve Online Survey Accuracy And Privacy In Big Data Era, Joseph K. Liu, Man Ho Au, Xinyi Huang, Willy Susilo, Jianying Zhou, Yong Yu
Faculty of Engineering and Information Sciences - Papers: Part A
An online survey system provides a convenient way for people to conduct surveys. It removes the necessity of human resources to hold paper surveys or telephone interviews and hence reduces the cost significantly. Nevertheless, accuracy and privacy remain as the major obstacles that need additional attention. To conduct an accurate survey, privacy maybe lost, and vice versa. In this paper, we provide new insight to preserve these two seeming contradictory issues in online survey systems especially suitable in big data era. We propose a secure system, which is shown to be efficient and practical by simulation data. Our analysis further …
Efficient Hidden Vector Encryption With Constant-Size Ciphertext, Phuong Viet Xuan Tran, Guomin Yang, Willy Susilo
Efficient Hidden Vector Encryption With Constant-Size Ciphertext, Phuong Viet Xuan Tran, Guomin Yang, Willy Susilo
Faculty of Engineering and Information Sciences - Papers: Part A
A Hidden Vector Encryption (HVE) scheme is a special type of anonymous identity-based encryption (IBE) scheme where the attribute string associated with the ciphertext or the user secret key can contain wildcards. In this paper, we introduce two constant-size ciphertext-policy hidden vector encryption (CP-HVE) schemes. Our first scheme is constructed on composite order bilinear groups, while the second one is built on prime order bilinear groups. Both schemes are proven secure in a selective security model which captures plaintext (or payload) and attribute hiding. To the best of our knowledge, our schemes are the first HVE constructions that can achieve …
Stress Prediction Model For Frp Confined Rectangular Concrete Columns With Rounded Corners, Thong M. Pham, Muhammad N. S Hadi
Stress Prediction Model For Frp Confined Rectangular Concrete Columns With Rounded Corners, Thong M. Pham, Muhammad N. S Hadi
Faculty of Engineering and Information Sciences - Papers: Part A
The paper uses the membrane hypothesis to formulate the confining behavior of fiber-reinforced polymer (FRP) confined rectangular columns. A model was developed to calculate the strength of FRP confined rectangular concrete columns. The model was verified using a database of 190 FRP confined rectangular concrete columns. The database covers unconfined concrete strength between 18.3 and 55.2 MPa, and specimens with dimensions ranging from 79-305 mm and 100-305 mm for short and long sides, respectively. The performance of the proposed model shows a very good correlation with the experimental results. In addition, the strain distribution of FRP around the circumference of …
Removal Of Dissolved Organics From Produced Water By Forward Osmosis, Rajab M. Abousnina, Long D. Nghiem
Removal Of Dissolved Organics From Produced Water By Forward Osmosis, Rajab M. Abousnina, Long D. Nghiem
Faculty of Engineering and Information Sciences - Papers: Part A
This study investigated the performance of the forward osmosis (FO) process for treating produced water. Water permeate flux and reverse salt flux (RSF) were examined at different feed pH values and operating configurations (i.e. FO, pressure retarded osmosis (PRO), and reverse osmosis (RO) modes). Acetic acid was selected as a model organic acid to present the dissolved organic fraction in produced water. Results reported here indicate that only membranes specifically designed for FO applications can be used in the FO and PRO modes. Due to the internal concentration polarization phenomenon, the PRO mode resulted in a higher water permeate flux …
The Effects Of Mediator And Granular Activated Carbon Addition On Degradation Of Trace Organic Contaminants By An Enzymatic Membrane Reactor, Luong N. Nguyen, Faisal I. Hai, William E. Price, Frederic Leusch, Felicity Roddick, Hao H. Ngo, Wenshan Guo, Saleh Faraj Magram, Long D. Nghiem
The Effects Of Mediator And Granular Activated Carbon Addition On Degradation Of Trace Organic Contaminants By An Enzymatic Membrane Reactor, Luong N. Nguyen, Faisal I. Hai, William E. Price, Frederic Leusch, Felicity Roddick, Hao H. Ngo, Wenshan Guo, Saleh Faraj Magram, Long D. Nghiem
Faculty of Engineering and Information Sciences - Papers: Part A
The removal of four recalcitrant trace organic contaminants (TrOCs), namely carbamazepine, diclofenac, sulfamethoxazole and atrazine by laccase in an enzymatic membrane reactor (EMR) was studied. Laccases are not effective for degrading non-phenolic compounds; nevertheless, 22-55% removal of these four TrOCs was achieved by the laccase EMR. Addition of the redox-mediator syringaldehyde (SA) to the EMR resulted in a notable dose-dependent improvement (15-45%) of TrOC removal affected by inherent TrOC properties and loading rates. However, SA addition resulted in a concomitant increase in the toxicity of the treated effluent. A further 14-25% improvement in aqueous phase removal of the TrOCs was …
Effect Of Stress State On Deformation And Fracture Of Nanocrystalline Copper: Molecular Dynamics Simulation, Liang Zhang, Cheng Lu, A Kiet Tieu, Linqing Pei, Xing Zhao
Effect Of Stress State On Deformation And Fracture Of Nanocrystalline Copper: Molecular Dynamics Simulation, Liang Zhang, Cheng Lu, A Kiet Tieu, Linqing Pei, Xing Zhao
Faculty of Engineering and Information Sciences - Papers: Part A
Deformation in a microcomponent is often constrained by surrounding joined material making the component under mixed loading and multiple stress states. In this study, molecular dynamics (MD) simulation are conducted to probe the effect of stress states on the deformation and fracture of nanocrystalline Cu. Tensile strain is applied on a Cu single crystal, bicrystal and polycrystal respectively, under two different tension boundary conditions. Simulations are first conducted on the bicrystal and polycrystal models without lattice imperfection. The results reveal that, compared with the performance of simulation models under free boundary condition, the transverse stress caused by the constrained boundary …
Removal Of Pathogens By Membrane Bioreactors: A Review Of The Mechanisms, Influencing Factors And Reduction In Chemical Disinfectant Dosing, Faisal I. Hai, Thomas Riley, Samia Shawkat, Saleh Faraj Magram, Kazuo Yamamoto
Removal Of Pathogens By Membrane Bioreactors: A Review Of The Mechanisms, Influencing Factors And Reduction In Chemical Disinfectant Dosing, Faisal I. Hai, Thomas Riley, Samia Shawkat, Saleh Faraj Magram, Kazuo Yamamoto
Faculty of Engineering and Information Sciences - Papers: Part A
The continued depletion of fresh drinking water resources throughout the world has increased the need for a variety of water treatment and recycling strategies. Conventional wastewater treatment processes rely on extensive chemical post-disinfection to comply with the stringent microbiological safety for water reuse. When well designed and operated, membrane bioreactors (MBRs) can consistently achieve efficient removals of suspended solids, protozoa and coliform bacteria. Under optimal conditions, MBR systems can also significantly remove various viruses and phages. This paper provides an in-depth overview of the mechanisms and influencing factors of pathogen removal by MBR and highlights practical issues, such as reduced …
A Novel Hydro-Geochemical Model For Treating Acidic Groundwater Utilizing A Permeable Reactive Barrier, Punyama Udeshini Pathirage, Buddhima Indraratna, Laura Banasiak
A Novel Hydro-Geochemical Model For Treating Acidic Groundwater Utilizing A Permeable Reactive Barrier, Punyama Udeshini Pathirage, Buddhima Indraratna, Laura Banasiak
Faculty of Engineering and Information Sciences - Papers: Part A
Acidic groundwater generation from acid sulfate soil is a severe environmental and socio-economic problem in coastal Australia. A novel permeable reactive barrier (PRB) utilising recycled concrete aggregates as the reactive media was installed in the Shoalhaven Floodplain, south of Wollongong in Australia. The performance of the PRB has been monitored to study the acid neutralisation behaviour of recycled concrete and its potential to remove high concentrations of Al and Fe, which are threatening to living habitat. This study aims to couple geochemistry with geo-hydraulics in the remediation of acidic groundwater generated in acid sulfate soil terrain, which has not been …
Requirements Elicitation And Specification Using The Agent Paradigm: The Case Study Of An Aircraft Turnaround Simulator, Tim Miller, Bin Lu, Leon Sterling, Ghassan Beydoun, Kuldar Taveter
Requirements Elicitation And Specification Using The Agent Paradigm: The Case Study Of An Aircraft Turnaround Simulator, Tim Miller, Bin Lu, Leon Sterling, Ghassan Beydoun, Kuldar Taveter
Faculty of Engineering and Information Sciences - Papers: Part A
In this paper, we describe research results arising from a technology transfer exercise on agent-oriented requirements engineering with an industry partner. We introduce two improvements to the state-of-the-art in agent-oriented requirements engineering, designed to mitigate two problems experienced by ourselves and our industry partner: (1) the lack of systematic methods for agent-oriented requirements elicitation and modelling; and (2) the lack of prescribed deliverables in agent-oriented requirements engineering. We discuss the application of our new approach to an aircraft turnaround simulator built in conjunction with our industry partner, and show how agent-oriented models can be derived and used to construct a …
Green Building Scheme Review Adds Yet More Policy Uncertainty, Daniel Daly, Paul Cooper
Green Building Scheme Review Adds Yet More Policy Uncertainty, Daniel Daly, Paul Cooper
Faculty of Engineering and Information Sciences - Papers: Part A
Australia's policies to cut greenhouse emissions have been shrouded in uncertainty over the past few months. The contentious Renewable Energy Target review and the swapping of the carbon price for Direct Action have garnered most of the headlines. But another policy, which has quietly been cutting emissions for the past four years, is now also under scrutiny.
Reynolds Number Influence On The Vortex-Induced Vibration Critical Point Of A Pivoted Cylinder, Brad Stappenbelt, Andrew D. Johnstone
Reynolds Number Influence On The Vortex-Induced Vibration Critical Point Of A Pivoted Cylinder, Brad Stappenbelt, Andrew D. Johnstone
Faculty of Engineering and Information Sciences - Papers: Part A
The aim of the present investigation was to examine the Reynolds number dependence of the critical vortex-induced vibration (VIV) point for cylinde rs in a pivoted system. For translational systems, the existence of a critical mass ratio for cylinders undergoing vortex-induced vibration has been well established.
How The Type Of Input Function Affects The Dynamic Response Of Conducting Polymer Actuators, Xingcan Xiang, Gursel Alici, Rahim Mutlu, Weihua Li
How The Type Of Input Function Affects The Dynamic Response Of Conducting Polymer Actuators, Xingcan Xiang, Gursel Alici, Rahim Mutlu, Weihua Li
Faculty of Engineering and Information Sciences - Papers: Part A
There has been a growing interest in smart actuators typified by conducting polymer actuators, especially in their (i) fabrication, modeling and control with minimum external data and (ii) applications in bio-inspired devices, robotics and mechatronics. Their control is a challenging research problem due to the complex and nonlinear properties of these actuators, which cannot be predicted accurately. Based on an input-shaping technique, we propose a new method to improve the conducting polymer actuators' command-following ability, while minimizing their electric power consumption. We applied four input functions with smooth characteristics to a trilayer conducting polymer actuator to experimentally evaluate its command-following …
Large Wind Turbine Structural Load Control: Trailing Edge Deformation Mechanism For Active Variable-Camber Blade, Michael Dicker, Buyung Kosasih
Large Wind Turbine Structural Load Control: Trailing Edge Deformation Mechanism For Active Variable-Camber Blade, Michael Dicker, Buyung Kosasih
Faculty of Engineering and Information Sciences - Papers: Part A
Blade root fatigue stress, primarily resulting from wind shear and turbulence, is a critical factor in wind turbine design. Blade mounted aerodynamic control devices have been shown to have the potential to reduce this. However, limited research exists into suitable devices. The blade designed in this work addresses this by employing an actuated compliant mechanism, contained within a flexible matrix composite structure. The resulting mechanism design achieves a sectional change in lift coefficient of ΔCL + 0.4 to -0.15. The performance of the blade is analysed with a quasi-steady time marching BEM model. A reduction of 21.59% in the standard …
Investigation Of Closure Of Internal Cracks During Rolling By Fe Model Considering Crack Surface Roughness, Hailiang Yu, A Kiet Tieu, Cheng Lu, Ajit R. Godbole
Investigation Of Closure Of Internal Cracks During Rolling By Fe Model Considering Crack Surface Roughness, Hailiang Yu, A Kiet Tieu, Cheng Lu, Ajit R. Godbole
Faculty of Engineering and Information Sciences - Papers: Part A
Internal cracks often appear in cast slabs, and their evolution during hot deformation directly affects the product quality. In this paper, the authors investigate the closure behavior of internal cracks during plate rolling using a finite element (FE) model that takes into account the roughness of the crack surface. Influences of the roughness and reduction ratio on the closure of cracks are analyzed. The simulated results show that the models with consideration of the initial crack roughness can be used to investigate the formation of residual voids around the crack after rolling. The simulation results are validated by experimental observations. …