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Development Of A Water-Mist Based Venturi System For Dust Control From Maingate Chocks And Bsl, Ting Ren, Graeme Cooper, Srinivasa Yarlagadda
Development Of A Water-Mist Based Venturi System For Dust Control From Maingate Chocks And Bsl, Ting Ren, Graeme Cooper, Srinivasa Yarlagadda
Faculty of Engineering - Papers (Archive)
Advances in modern longwall (LW) technology have resulted in high production faces with more powerful chocks and shearers that can advance at faster rates. As longwall chocks (supports) advance, crushed roof coal and/or rock can fall from the top of the chock canopy into the face ventilation airflow. Dust survey showed that chock movement is a significant source of dust exposure for shearer operators, accounting for about 47% of total LW face dust make during the cutting cycle. 3D CFD models have been developed to understand the behaviour of longwall dust particles from various sources including maingate (MG) chocks and …
Development Of A Web-Based Underground Coal Mining Information Management System, Ian Porter, Ernest Y. Baafi, Raymond J. Stace
Development Of A Web-Based Underground Coal Mining Information Management System, Ian Porter, Ernest Y. Baafi, Raymond J. Stace
Faculty of Engineering - Papers (Archive)
The development of the Australian Coal Association Research Program (ACARP) funded “one stop shop” information management system for the coal mining industry is described. The site www.undergroundcoal.com.au went live on 28 August 2009 with various sub-modules including an introduction to underground coal mining practices and a handbook of roadway development practice. The site also includes presentations from ACARP six-monthly workshops on current roadway development practice. These workshops provide an invaluable opportunity to share state of the art knowledge in roadway development practice, to learn of emerging Research and Development (Rand D) programs and development of equipment and technology by Original …
Microdroplet-Based Universal Logic Gates By Electrorheological Fluid, Mengying Zhang, Limu Wang, Xiang Wang, Jinbo Wu, Jiaxing Li, Xiuqing Gong, Jianhua Qin, Weihua Li, Weijia Wen
Microdroplet-Based Universal Logic Gates By Electrorheological Fluid, Mengying Zhang, Limu Wang, Xiang Wang, Jinbo Wu, Jiaxing Li, Xiuqing Gong, Jianhua Qin, Weihua Li, Weijia Wen
Faculty of Engineering - Papers (Archive)
We demonstrate a uniquely designed microfluid logic gate with universal functionality, which is capable of conducting all 16 logic operations in one chip, with different input voltage combinations. A kind of smart colloid, giant electrorheological (GER) fluid, functions as the translation media among fluidic, electronic and mechanic information, providing us with the capability of performing large integrations either on-chip or off-chip, while the on-chip hybrid circuit is formed by the interconnection of the electric components and fluidic channels, where the individual microdroplets travelling in a channel represents a bit. The universal logic gate reveals the possibilities of achieving a large-scale …
Enhanced Mccullagh-Barreto Identity-Based Key Exchange Protocols With Master Key Forward Security, Hua Guo, Yi Mu, Xiyong Zhang, Zhoujun Li
Enhanced Mccullagh-Barreto Identity-Based Key Exchange Protocols With Master Key Forward Security, Hua Guo, Yi Mu, Xiyong Zhang, Zhoujun Li
Faculty of Engineering - Papers (Archive)
Master key forward security is an important property for identity-based key exchange protocols. Unfortunately, most of existing identity-based key exchange protocols do not satisfy this property. In this paper, we firstly analyse Xie's modified protocol to show that signature is undesirable for an identity-based key agreement protocol with the master key forward secrecy. Then we present two improved protocols from McCullagh-Barreto identity-based key agreement protocol to capture the master key forward security. Our first protocol is efficient and its security can be proved with the help of a decisional oracle, while the second one achieves stronger security and its security …
Extended Dislocation-Based Pinning Mechanism In Superconducting Yba2cu3o7 Films, Serhiy Pysarenko, Alexey V. Pan, S X. Dou, Rashmi Nigam
Extended Dislocation-Based Pinning Mechanism In Superconducting Yba2cu3o7 Films, Serhiy Pysarenko, Alexey V. Pan, S X. Dou, Rashmi Nigam
Faculty of Engineering - Papers (Archive)
To describe the critical current density (Jc) as the function of applied magnetic field (Ba) in high quality YBa2Cu3O7 (YBCO) superconducting films, the vortex pinning mechanism along the structural domain boundaries of the films is developed. The boundaries, assumed to have low misorientation angles, are quantitatively considered to consist of individual edge dislocations acting as pinning wells, rather than a continuous boundary. This extended model accurately describes the experimental Jc(Ba) over the wide field and temperature ranges. Marginal deviations of the model from the …
Enhancement Of Co Substitution Induced By Eu Codoping In Zno-Based Diluted Magnetic Semiconducting Thin Films, P Photongkam, Y B Zhang, M.H.N Assadi, S Li, D Yu, Mihail Ionescu, Alexey V. Pan
Enhancement Of Co Substitution Induced By Eu Codoping In Zno-Based Diluted Magnetic Semiconducting Thin Films, P Photongkam, Y B Zhang, M.H.N Assadi, S Li, D Yu, Mihail Ionescu, Alexey V. Pan
Faculty of Engineering - Papers (Archive)
To avoid the occurrence of doped magnetic ion clustering is a challenge in fabrication of diluted magnetic semiconductors (DMSs). In this work, we report the intrinsic ferromagnetic behavior in Co-doped ZnO DMSs induced by Eu codoping. Both structural parameters and magnetic properties demonstrate the existence of an interaction between Co and Eu ions. The observation of multiplet structures for the localized Co 3d states in x-ray absorption and x-ray magnetic circular dichroism characterization evidences that the codoped Eu plays an important role in facilitating the Co substitution of Zn, leading to intrinsic ferromagnetism.
A Continuously-Stable Linear Actuation Based On Bending Type Artificial Muscles, Rahim Mutlu, Gursel Alici
A Continuously-Stable Linear Actuation Based On Bending Type Artificial Muscles, Rahim Mutlu, Gursel Alici
Faculty of Engineering - Papers (Archive)
Electroactive polymer actuators, also known as artificial muscles, can operate both in wet and dry media under as small as 1 Volt potential difference. This paper reports on a multi-stable linear actuation mechanism articulated with artificial muscles. Kinematic and finite element analyses of the mechanism are studied to demonstrate the feasibility of the mechanism. Experiments were conducted on a real mechanism articulated with a multiple number (4 or 8) of electroactive polymer actuators, which had the dimensions of 12×2×0.17mm. The numerical and experimental results demonstrate that the angular displacement of the artificial muscles is accurately transformed into a rectilinear motion …
Si-Based Anode Materials For Lithium Rechargeable Batteries, Hua-Kun Liu, Zaiping Guo, Jiazhao Wang, Konstantin K. Konstantinov
Si-Based Anode Materials For Lithium Rechargeable Batteries, Hua-Kun Liu, Zaiping Guo, Jiazhao Wang, Konstantin K. Konstantinov
Faculty of Engineering - Papers (Archive)
Silicon is a very promising candidate to replace graphite as the anode in Li-ion batteries because of its very high theoretical capacity, relatively low cost and low toxicity. However, it has not yet made its way into commercial cells. This review highlights recent progress on Si-based anode materials for lithium rechargeable batteries.
An Age-Based Inspection And Replacement Policy For Heterogeneous Components, Philip A. Scarf, Cristiano A. V. Cavalcante, Richard A. Dwight, Peter Gordon
An Age-Based Inspection And Replacement Policy For Heterogeneous Components, Philip A. Scarf, Cristiano A. V. Cavalcante, Richard A. Dwight, Peter Gordon
Faculty of Engineering - Papers (Archive)
This paper considers a hybrid maintenance policy for a single component from a heterogeneous population. The component is placed in a socket, and the component and socket together comprise the system. The s-population of components consists of two sub-populations with different failure characteristics. By supposing that a component may be in a defective but operating state, so that there exists a delay time between defect arrival and component failure, we consider a novel maintenance policy that is a hybrid of inspection and replacement policies. There are similarities in this approach with the concept of ldquoburn-inrdquo maintenance. The policies are …
A Method To Design Transmission Resonances Through Subwavelength Apertures Based On Designed Surface Plasmons, Jinsong Liu, Lan Ding, Kejia Wang, Jianquan Yao
A Method To Design Transmission Resonances Through Subwavelength Apertures Based On Designed Surface Plasmons, Jinsong Liu, Lan Ding, Kejia Wang, Jianquan Yao
Faculty of Engineering - Papers (Archive)
A plasmonic metamaterial is proposed for which an array of subwavelength apertures is pierced into a metallic foil whose one flat surface has been made with periodic rectangle holes of finite depth. Designed surface plasmons sustained by the holes are explored when the size and spacing of the holes are much smaller than those of the apertures. The transmission property of electromagnetic waves through the metamaterials is analyzed. Results show that the designed surface plasmons characterized by the holes could support the transmission resonances of the incident wave passing through the subwavelength apertures, and that the peak transmission wavelengths could …
Project Based Learning In The First Year Engineering Curriculum, Brad Stappenbelt, Chris Rowles
Project Based Learning In The First Year Engineering Curriculum, Brad Stappenbelt, Chris Rowles
Faculty of Engineering - Papers (Archive)
This paper examines the implementation of a project-based learning approach in the first year engineering curriculum at the University of Western Australia (UWA). As part of this initiative, the Engineers Without Borders (EWB) Challenge was employed as the focus of student activity within the core undergraduate unit Introduction to Professional Engineering. This unit is the foundation of the professional development component of the engineering degree at UWA. The EWB Challenge provided students with the opportunity to learn about professional engineering whilst contributing towards a real international development project. To create a successful project based learning environment, a comprehensive tutor training …
A Bio-Inspired Robotic Locomotion System Based On Conducting Polymer Actuators, Gursel Alici, Daniel Gunderson
A Bio-Inspired Robotic Locomotion System Based On Conducting Polymer Actuators, Gursel Alici, Daniel Gunderson
Faculty of Engineering - Papers (Archive)
This paper presents the conceptual design and testing of a bio-inspired locomotion system activated through ionic-type conducting polymer actuators, which can operate both in dry and wet environments. The locomotion system is proposed for a mini autonomous crawling device for applications typified by pipe inspection, search, inspection and data gathering in confined spaces, which require mini-robotic systems. The locomotion system is based on the cilia, which has a simple planar bending motion. This type of motion can be provided by bending-type polymer actuators (one-end fixed and the other-end free cantilever beam). The actuators mounted on a printed circuit board and …
A Comparative Study On Field, Temperature, And Strain Dependences Of The Critical Current For Doped And Undoped Mgb2 Wires Based On The Percolation Model, Sangjun Oh, Jung Ho Kim, Kyuhwan Cho, Chulhee Lee, Chan-Joong Kim, S. X. Dou, M Rindfleisch, Mike Tomsic, Jung-Ho Ahn
A Comparative Study On Field, Temperature, And Strain Dependences Of The Critical Current For Doped And Undoped Mgb2 Wires Based On The Percolation Model, Sangjun Oh, Jung Ho Kim, Kyuhwan Cho, Chulhee Lee, Chan-Joong Kim, S. X. Dou, M Rindfleisch, Mike Tomsic, Jung-Ho Ahn
Faculty of Engineering - Papers (Archive)
Field, temperature, and strain dependences of the critical current for a SiC doped multifilamentary in situ MgB2 wire have been studied. Measurement results were compared with that of the undoped wire, and the origin of the difference in the critical current is discussed. The critical current can be calculated with the percolation model considering the effect of anisotropy. The temperature dependence of the fitting parameters, the upper critical field along the ab-plane, and c-axis is compared with the dirty-limit two-gap theory. To assess the validity of the fitting parameters, resistive transition has been measured especially to …
Establishing A Project Based Learning Environment For First Year Engineering Students, Brad Stappenbelt
Establishing A Project Based Learning Environment For First Year Engineering Students, Brad Stappenbelt
Faculty of Engineering - Papers (Archive)
A project-based learning environment was recently established for first-year engineering students at the University of Western Australia. At the focus of this educational approach was a real international development project run within the core undergraduate unit Introduction to Professional Engineering. Students embarking on the professional development component of the engineering degree were traditionally taught about the role of the engineer, social and cultural engineering considerations, the multi-disciplinary nature of large engineering projects and team working and communication skills with minimal involvement in project and group work. The various concepts covered were treated primarily on an abstract theoretical level. Despite the …
A Galvanic Cell Driven Controlled Release System Based On Conducting Polymers, Caiyun Wang, Chee O. Too, Philip G. Whitten, G G. Wallace
A Galvanic Cell Driven Controlled Release System Based On Conducting Polymers, Caiyun Wang, Chee O. Too, Philip G. Whitten, G G. Wallace
Faculty of Engineering - Papers (Archive)
A self-powered controlled release system is achieved via galvanic coupling of a conducting polymer and a zinc anode. Release of an anionic dye molecule, phenol red (PR), as the polymer is reduced is quantified. Triggered release using the galvanic cell is demonstrated in a freeze-thaw experiment when melting of the electrolyte completes the galvanic cell and enables oxidation/reduction to occur.
Synthesis And Characterization Of Srbi4ti4o15 Ferroelectric Filler Based Composite Polymer Electrolytes For Lithium Ion Batteries, Devaraj Shanmukaraj, Guoxiu Wang, Hua-Kun Liu, R Murugan
Synthesis And Characterization Of Srbi4ti4o15 Ferroelectric Filler Based Composite Polymer Electrolytes For Lithium Ion Batteries, Devaraj Shanmukaraj, Guoxiu Wang, Hua-Kun Liu, R Murugan
Faculty of Engineering - Papers (Archive)
Composite polymer electrolytes (CPEs) based on poly (ethylene oxide) (PEO) (Mol.Wt similar to 6 x 10(5)) complexed with LiN(CF3SO2)(2) lithium salt and SrBi4Ti4O15 ferroelectric ceramic filler have been prepared as films. Citrate gel technique and conventional solid state technique were employed for the synthesis of the ferroelectric fillers in order to study the effect of particle size of the filler on ionic conductivity of the polymer electrolyte. Characterization techniques such as X-ray diffraction (XRD), differential thermal analysis (DTA), scanning electron microscopy (SEM) and temperature dependant DC conductivity studies were taken for the prepared polymer composite electrolytes. The broadening of DTA …
Chemical Solution Deposition Of Lamno3-Based Films For Coated Conductors, Dongqi Shi, Xuebin Zhu, Jung Ho Kim, Hechang Lei, Lin Wang, Yuping Sun, Rong Zeng, S. X. Dou
Chemical Solution Deposition Of Lamno3-Based Films For Coated Conductors, Dongqi Shi, Xuebin Zhu, Jung Ho Kim, Hechang Lei, Lin Wang, Yuping Sun, Rong Zeng, S. X. Dou
Faculty of Engineering - Papers (Archive)
LaMnO3-based films were prepared using the chemical solution deposition method. It was found that the films on perovskite oxide single crystal substrates are highly (h00)-oriented when the annealing atmosphere is oxygen or air; however, when the substrate is yttrium-stabilized ZrO2, only the La1-NmO3 films are highly (h00)-oriented, and other LaMnO3-based films are (110)-oriented. Under a reducing annealing atmosphere, the atmosphere must be wet in order to create a suitable oxygen partial pressure to crystallize the LaMnO3-based films. After annealing under a wet reducing atmosphere the LaMnO3-based films are directly deposited on Ni tapes; however, when SrTiO3-buffered Ni types are used, …
Explanation Of Magnetic Behavior In Ru-Based Superconducting Ferromagnets, Rashmi Nigam, Alexey V. Pan, S X. Dou
Explanation Of Magnetic Behavior In Ru-Based Superconducting Ferromagnets, Rashmi Nigam, Alexey V. Pan, S X. Dou
Faculty of Engineering - Papers (Archive)
We have investigated RuSr2Eu1.5Ce2O10 (Ru-1222) and RuSr2EuCu2O8 (Ru-1212) samples by using x-ray diffraction, scanning electron microscopy, dc magnetization, ac susceptibility, and resistivity measurements. Based on the results obtained, we propose an explanation of the magnetic behaviour of the Ru-based systems. Our model is capable of describing controversial observations of multiple magnetic transitions on temperature dependent dc magnetization measurements as well as the reentrance of irreversibility in hysteresis ≤200K. The experimental results suggest that Ru-based samples always contain a small amount of at least one additional magnetic phase with …
Stiffness Characterisation Of Microcantilevers Based On Conducting Polymers, Gursel Alici, Michael J. Higgins
Stiffness Characterisation Of Microcantilevers Based On Conducting Polymers, Gursel Alici, Michael J. Higgins
Faculty of Engineering - Papers (Archive)
The object of this paper is to characterise the stiffness of microfabricated cantilevers consisting of two electroactive polymer (polypyrrole (PPy)) layers, and two gold layers with a negligible thickness and a layer of porous polyvinylidene fluoride (PVDF), which serves as a backing layer and electrolyte storage tank. This composite cantilever structure is used as polymer actuators or famously known as artificial muscles when tailored appropriately. The polymer microactuators considered in this study, which were fabricated using a laser ablation technique, could operate both in aqueous and non-aqueous media. The stiffness characterization of the microactuators is critical to assess their suitability …
Ductile Ultrafine-Grained Ti-Based Alloys With High Yield Strength, Lai-Chang Zhang, Hai-Bo Lu, Christine Mickel, Jurgen Eckert
Ductile Ultrafine-Grained Ti-Based Alloys With High Yield Strength, Lai-Chang Zhang, Hai-Bo Lu, Christine Mickel, Jurgen Eckert
Faculty of Engineering - Papers (Archive)
The authors report on ductile ultrafine-grained (Ti0.72Fe0.28)100−xTax (0 ⩽ x ⩽ 4) alloys with not only high fracture strength but simultaneously high yield strength exceeding 2000 MPa along with distinct plasticity, which are superior to high-strength Ti-based bulk metallic glasses and bimodal composites. All alloys mainly consist of β-Ti and FeTi solid solutions but display different microstructures. The alloys exhibit a high fracture strength >2500 MPa and a high yield strength >2000 MPa as well as large plasticity of ∼ 5%–7.5%. The microstructure-property correlation of these ultrafine-grained alloys is discussed.
Motion Tracking Control Of Piezo-Driven Flexure-Based Mechanism Based On Sliding Mode Strategy, Hwee Choo Liaw, Bijan Shirinzadeh, Julian Smith, Gursel Alici
Motion Tracking Control Of Piezo-Driven Flexure-Based Mechanism Based On Sliding Mode Strategy, Hwee Choo Liaw, Bijan Shirinzadeh, Julian Smith, Gursel Alici
Faculty of Engineering - Papers (Archive)
This paper presents a motion tracking control methodology based on sliding mode strategy for a flexure-based micro/nano manipulator driven by a piezoelectric actuator. This control methodology is proposed for tracking of desired motion trajectories in the presence of uncertain system parameters, non-linearities including the hysteresis effect, and external disturbances in the control system. In this paper, a four-bar link is investigated and a lumped parameter dynamic model is established for the formulation of the proposed sliding mode motion control methodology. The convergence of the position tracking error to zero is assured by the approach in the presence of the aforementioned …
Effect Of High Pressure During The Fabrication On The Thermal And Mechanical Properties Of Amorphous Ni60nb40 Particle-Reinforced Al-Based Metal Matrix Composites, Peng Yu, Shankar Venkataraman, Jayanta Das, Laichang Zhang, Wenyong Zhang, Jurgen Eckert
Effect Of High Pressure During The Fabrication On The Thermal And Mechanical Properties Of Amorphous Ni60nb40 Particle-Reinforced Al-Based Metal Matrix Composites, Peng Yu, Shankar Venkataraman, Jayanta Das, Laichang Zhang, Wenyong Zhang, Jurgen Eckert
Faculty of Engineering - Papers (Archive)
Ni60Nb40 metallic glass particles, prepared by mechanical alloying, were used to fabricate Al–30 wt% Ni60Nb40 metal matrix composites (MMCs) at 823 K by sintering, hot pressing, and hot extrusion. The Ni60Nb40 reinforcements remained amorphous in all the MMCs fabricated by the different methods. Compression tests revealed that the Young’s modulus and yield strength of the MMCs produced by hot-pressing and hot-extrusion are higher than those for the sintered specimens. Differential scanning calorimeter (DSC) annealing of the as-produced MMCs at 913 K revealed there are severe interfacial reactions between the Al matrix …
A Robotic Gripper Based On Conducting Polymer Actuators, Gursel Alici, Nam N. Huynh
A Robotic Gripper Based On Conducting Polymer Actuators, Gursel Alici, Nam N. Huynh
Faculty of Engineering - Papers (Archive)
Conducting polymer actuators or as widely known as artificial muscles have many promising features such as being biocompatible and suitable to open loop control, and having high force to weight ratio. If properly engineered, they can be employed as actuators plus joints like active flexure joints articulating monolithic structures. Such structures or systems not containing any sliding and/or rolling components potentially have high positioning accuracy, which is crucial for micro/nano manipulation applications. In this paper, we employ a bending type polymer actuator to articulate two separate rigid links made up of carbon fibre such that a two-finger gripper is formed. …
Blind Source Separation Based On Time-Domain Optimization Of A Frequency-Domain Independence Criterion, Tiemin Mei, Jiangtao Xi, Fuliang Yin, A. Mertins, Jose F. Chicharo
Blind Source Separation Based On Time-Domain Optimization Of A Frequency-Domain Independence Criterion, Tiemin Mei, Jiangtao Xi, Fuliang Yin, A. Mertins, Jose F. Chicharo
Faculty of Engineering - Papers (Archive)
A new technique for the blind separation of convolutive mixtures is proposed in this paper. Inspired by the works of Amari, Sabala , and Rahbar, we firstly start from the application of Kullback-Leibler divergence in frequency domain, and then we integrate Kullback-Leibler divergence over the whole frequency range of interest to yield a new objective function which turns out to be time-domain variable dependent. In other words, the objective function is derived in frequency domain which can be optimized with respect to time domain variables. The proposed technique has the advantages of frequency domain approaches and is suitable for very …
Contact State Determination For Robotic-Based Cylindrical Pair Height Adjustment Under Dynamic Conditions, Prasan I. De Waas Tilakaratna, Bijan Shirinzadeh, Gursel Alici
Contact State Determination For Robotic-Based Cylindrical Pair Height Adjustment Under Dynamic Conditions, Prasan I. De Waas Tilakaratna, Bijan Shirinzadeh, Gursel Alici
Faculty of Engineering - Papers (Archive)
This paper investigates fine motion strategies associated with the height adjustment manipulations of a cylindrical pair which can be utilised in dynamic assembly and reconfigurable workholding systems. The outer link of the cylindrical pair is held by the end-effector of a 6DOF serial articulated robot. The environment which holds the inner link can be dynamic. Formulations capable of identifying the type of contact between the links and parameters vital for control purposes based on the force and torque data provided by a wrist mounted F/T sensor are established for a generic spatial case. Experimental results indicate that the established methodology …
Cellular Neural Network Based Deformation Simulation With Haptic Force Feedback, Yongmin Zhong, Bijan Shirinzadeh, Gursel Alici, Julian Smith
Cellular Neural Network Based Deformation Simulation With Haptic Force Feedback, Yongmin Zhong, Bijan Shirinzadeh, Gursel Alici, Julian Smith
Faculty of Engineering - Papers (Archive)
This paper presents a new methodology for deformable object modelling by drawing an analogy between cellular neural network (CNN) and elastic deformation. The potential energy stored in an elastic body as a result of a deformation caused by an external force is propagated among mass points by the non-linear CNN activity. An improved CNN model is developed for propagating the energy generated by the external force on the object surface in the natural manner of Poisson equation. The proposed methodology models non-linear materials with nonlinear CNN rather than geometric non-linearity in the most existing deformation methods. It can not only …
Discrete Cosine Transform Based Shift Estimation For Fringe Pattern Profilometry Using Generalized Analysis Model, Jose F. Chicharo, Jiangtao Xi, Yingsong Hu, Zongkai Yang, Enbang Li
Discrete Cosine Transform Based Shift Estimation For Fringe Pattern Profilometry Using Generalized Analysis Model, Jose F. Chicharo, Jiangtao Xi, Yingsong Hu, Zongkai Yang, Enbang Li
Faculty of Engineering - Papers (Archive)
This paper presents a new analysis algorithm to carry out profile measure- ment with low computational complexity and less noise-sensitivity. Firstly, a discrete cosine transform (DCT) based representation method is introduced to express the height distribution of the three-dimensional surface. Then, a novel shift estimation algorithm, called DCT based shift estimation (DCT-SE) is presented to reconstruct three-dimensional object surfaces by using the proposed expression and the generalized analysis model. The advantage of DCT-SE is that without loss of measurement precise it provides lower computational complexity to implement three-dimensional reconstruction from distorted fringe patterns and at the same time survives from …
Thermal Stability And Crystallization Kinetics Of Mechanically Alloyed Tic/Ti-Based Metallic Glass Matrix Composite, Laichang Zhang, J. Xu, J Eckert
Thermal Stability And Crystallization Kinetics Of Mechanically Alloyed Tic/Ti-Based Metallic Glass Matrix Composite, Laichang Zhang, J. Xu, J Eckert
Faculty of Engineering - Papers (Archive)
A Ti-based metallic glass matrix composite with 10vol% TiC is synthesized by mechanical alloying. The thermal stability and crystallization kinetics of the metallic glass and compositepowders are investigated by differential scanning calorimetry in the mode of isochronal heating and isothermal annealing. The isothermal transformation kinetics is analyzed by the Kolmogorov-Johnson-Mehl-Avrami equation. The values of the Avrami exponent calculated for low crystallization volume fractions imply that the crystallization of both types of powders is governed by diffusion-controlled three-dimensional growth. The mean activation energy of crystallization for the composite is slightly lower than that of the Ti-based metallic glass. The addition of …
Three-Dimensional Profilometry Based On Shift Estimation Of Projected Fringe Patterns, Jose F. Chicharo, Jiangtao Xi, Yingsong Hu, Zongkai Yang, Enbang Li
Three-Dimensional Profilometry Based On Shift Estimation Of Projected Fringe Patterns, Jose F. Chicharo, Jiangtao Xi, Yingsong Hu, Zongkai Yang, Enbang Li
Faculty of Engineering - Papers (Archive)
This paper presents a new approach to fringe pattern profilometry. In this paper, a generalized model for describing the relationship between the projected fringe pattern and deformed fringe pattern is derived, where the projected fringe pattern can be arbitrary rather than being limited to be sinusoidal as those for the conventional approaches. Based on this model, a new approach is proposed to reconstruct the three-dimensional object surface by estimating the shift between the projected and deformed fringe patterns. Additionally, theoretical analysis and computer simulation results are presented, both of which show the proposed approach can significantly improve the measurement accuracy, …
Fiber-Optic Temperature Sensor Based On Interference Of Selective Higher-Order Modes, Enbang Li, X L Wang, Chao Zhang
Fiber-Optic Temperature Sensor Based On Interference Of Selective Higher-Order Modes, Enbang Li, X L Wang, Chao Zhang
Faculty of Engineering - Papers (Archive)
A fiber-optic temperature sensor based on the interference of selective higher-order modes in circular optical fibers is described. The authors demonstrate that by coupling the LP01 mode in a standard single-mode fiber to the LP0m modes in a multimode fiber, and utilizing the interference of the higher-order modes, a fiber-optic temperature sensor which has an extremely simple structure and is suitable for high-temperature measurements can be constructed. The sensing principle, temperature measurement experiments, and results are presented.