Open Access. Powered by Scholars. Published by Universities.®
- Discipline
- Keyword
-
- [RSTDPub] (12)
- Liquid crystal devices (2)
- Modelling (2)
- Nanophotonics (2)
- Nanostructured materials (2)
-
- Opto-VLSI processor (2)
- Particle swarm optimization (PSO) (2)
- Photodetectors (2)
- Photovoltaic (2)
- A. Ceramic (1)
- Adaptive noise cancellation (1)
- Adaptive optical splitter (1)
- Adhesion (1)
- Analytical modelling (1)
- B. Modelling studies (1)
- B. XPS (1)
- Bandpass filter (BPF) (1)
- Beam splitter (1)
- C. Acid corrosion (1)
- C. Pitting corrosion (1)
- C. SEM (1)
- CAD (1)
- Coercive force (1)
- Corrosion (1)
- Current control (1)
- Current controller (1)
- Database (1)
- Demand prediction (1)
- Design and assembly (1)
- Economic and environmental analyses of energy projects (1)
- Publication
Articles 1 - 30 of 31
Full-Text Articles in Engineering
Fuzzy Controlled Hydraulic Excavator With Model Parameter Uncertainty, Ganesh Kothapalli, Mohammed Hassan
Fuzzy Controlled Hydraulic Excavator With Model Parameter Uncertainty, Ganesh Kothapalli, Mohammed Hassan
Research outputs 2011
The hydraulic actuated excavator, being a non-linear mobile machine, encounters many uncertainties. There are uncertainties in the hydraulic system in addition to the uncertain nature of the load. The simulation results obtained in this study show that there is a need for intelligent control of such machines and in particular interval type-2 fuzzy controller is most suitable for minimizing the position error of a typical excavator’s bucket under load variations. We consider the model parameter uncertainties such as hydraulic fluid leakage and friction. These are uncertainties which also depend up on the temperature and alter bulk modulus and viscosity of …
Transmission Improvement Of Umts And Wi-Fi Signals Through Energy Saving Glass Using Fss, Irfan Ullah, Xiaoli Zhao, Daryoush Habibi, Ghaffer I. Kiani
Transmission Improvement Of Umts And Wi-Fi Signals Through Energy Saving Glass Using Fss, Irfan Ullah, Xiaoli Zhao, Daryoush Habibi, Ghaffer I. Kiani
Research outputs 2011
The transmission of infrared (IR) and visible frequencies through modern energy-saving glass, due to etching of bandpass frequency-selective surfaces (FSSs), is analysed. Energy-saving glass panels employ a very thin layer of metallic oxide on one side of the ordinary glass. Due to the presence of this layer, IR waves are attenuated whereas visible wavelengths can pass through, providing good see-through effect. However, one drawback with such energy-saving glass panels is that they also attenuate useful radio frequency (RF)/ microwave (MW) signals such as those used for mobile (e.g. global system for mobile communication (GSM)), global positioning system (GPS) and personal …
Computer Based Experiments For Off-Campus Teaching And Learning Of Ac Electricity, Graham Wild, Geoffrey Swan, Steven Hinckley
Computer Based Experiments For Off-Campus Teaching And Learning Of Ac Electricity, Graham Wild, Geoffrey Swan, Steven Hinckley
Research outputs 2011
In this work, we show the implementation of a computer based Digital Storage Oscilloscope (DSO) and Signal Generator (SG), using the computers soundcard for off- campus AC electronics experiments. The microphone input is used for the DSO, and the speaker jack is used as the SG. In an effort to reduce the cost of implementing the experiment, we examine software available for free online. A small number of applications were compared in terms of their interface and functionality, for both the DSO and SG. With the choice of a suitable app for both the input and the output, simple AC …
Dynamic Modelling Of Zenith Wet Delay In Gnss Measurements, Ahmed El-Mowafy, Johnny Lo, Congwei Hu
Dynamic Modelling Of Zenith Wet Delay In Gnss Measurements, Ahmed El-Mowafy, Johnny Lo, Congwei Hu
Research outputs 2011
Proper modelling of the temporal correlations of the zenith wet delay (ZWD) is important in some of the Global Navigation Satellite Systems (GNSS) applications such as estimation of the Perceptible Water Vapour (PWV), and methods such as Precise Point Positioning (PPP). The random walk (RW) and the first-order Gauss- Markov (GM) autocorrelation model are commonly used for the dynamic modelling of ZWD in Kalman filtering of GNSS measurements. However, it was found that the GM model consistently underestimates the temporal correlations that exist among the ZWD estimates. Therefore, a new autocorrelation dynamic model is proposed in a form similar to …
Numerical Modelling Of Interrogation Systems For Optical Fibre Bragg Grating Sensors, Daniel P. Oswald, Steven J. Richardson, Graham Wild
Numerical Modelling Of Interrogation Systems For Optical Fibre Bragg Grating Sensors, Daniel P. Oswald, Steven J. Richardson, Graham Wild
Research outputs 2011
There are a number of interrogation methods that can be used in optical Fibre Bragg Grating (FBG) sensing system. For very high frequency signals interrogating the sensor signal from an FBG is limited to two intensiometric methods, edge filter detection and power detection. In edge filter detection, a broadband light source illuminates an FBG, the reflected spectrum is then passed through a spectral filter. In power detection, a narrowband light source with a wavelength corresponding to the 3dB point of the FBG is filtered by the FBG itself. Both methods convert the spectral shift of the FBG into intensity signals. …
Nano-Engineered High-Performance Magneto-Optic Garnet Materials, Mohammad Nur-E-Alam, Mikhail Vasiliev, Viacheslav Kotov, Kamal Alameh
Nano-Engineered High-Performance Magneto-Optic Garnet Materials, Mohammad Nur-E-Alam, Mikhail Vasiliev, Viacheslav Kotov, Kamal Alameh
ECU Presentations
No abstract provided.
A 1x4 Adaptive Optical Splitter Based On Opto-Vlsi Processor, Haithem Mustafa, Feng Xiao, Kamal Alameh
A 1x4 Adaptive Optical Splitter Based On Opto-Vlsi Processor, Haithem Mustafa, Feng Xiao, Kamal Alameh
Research outputs 2011
We propose and experimentally demonstrate a novel high resolution 1×4 adaptive optical power splitter based on the use of an Opto-VLSI processor and a 4-f imaging system with an optimized optical beam waist profile. By uploading optimized multicasting phase holograms onto the software-driven Opto-VLSI processor, an input optical signal is dynamically split into different output fiber ports with user-defined splitting ratios. Experimental results showing dynamic optical splitting over a wavelength range exceeding 50 nm are presented.
Secondary Students Research Projects In Engineering: Optical Fibre Bragg Grating Sensor Applications, Steven Hinckley, Graham Wild
Secondary Students Research Projects In Engineering: Optical Fibre Bragg Grating Sensor Applications, Steven Hinckley, Graham Wild
Research outputs 2011
In this paper, we present a study of secondary student research projects on fibre Bragg grating (FBG) based optical fibre sensors. Our study has shown that simple experimental procedures can be developed and implemented by students with minimal prior knowledge. In these experiments, students gain a significant understanding of FBG properties and performance, as well as an understanding of research, data analysis and communications skills required by researchers. Student satisfaction and enjoyment with the programme is very high, based on feedback received. These research-based projects would be ideal for implementation into undergraduate engineering learning programmes.
Interpolation Of The Gnss Wet Troposphere Delay, Johnny Lo, Ahmed El-Mowafy
Interpolation Of The Gnss Wet Troposphere Delay, Johnny Lo, Ahmed El-Mowafy
Research outputs 2011
Troposphere delay is one of the main distance-dependent errors in Global Navigation Satellite Systems (GNSS) observations. Precise estimation of the troposphere wet delay is necessary to aid ambiguity resolution and for positioning in network Real-Time Kinematic (RTK) and Precise Point Positioning. Wet tropospheric estimates can also serve as a source of atmospheric information to facilitate weather forecasting. Interpolation of the troposphere wet delay is thus required when its estimation is interrupted for short periods or when data are processed at higher intervals from that of available data. The objective of this research is to compare the performance of several interpolation …
Stabilisation Of Linear-Cavity Fibre Laser Using A Saturable Absorber, David Michel, Feng Xiao, Kamal Alameh
Stabilisation Of Linear-Cavity Fibre Laser Using A Saturable Absorber, David Michel, Feng Xiao, Kamal Alameh
Research outputs 2011
We investigate the optimisation of the length of an un-pumped erbium doped fibre (EDF) in order to suppress amplifier noise in a linear-cavity fibre laser structure. The experimental results demonstrate the existence of an optimum length of the un-pumped EDF which eliminates noise due to high optical pumping powers, thus leading to a stable laser output.
Structure-Property-Performance Of Nanocomposite Cr-Si-N Films Synthesized By A Duplex Surface Treatment Technique, Daohui Lai, Jiang Xu, Zong-Han Xie, Paul R. Munroe
Structure-Property-Performance Of Nanocomposite Cr-Si-N Films Synthesized By A Duplex Surface Treatment Technique, Daohui Lai, Jiang Xu, Zong-Han Xie, Paul R. Munroe
Research outputs 2011
Nanocomposite Cr–Si–N films were prepared on to Ti–6Al–4V substrates by a novel duplex surface treatment technique. Coatings consisting of a Cr3Si surface layer were deposited using a double cathode glow plasma and subsequent surface plasma nitriding. The surface topography, chemical composition, and microstructure of these treated alloys were analyzed by a variety of surface characterization techniques. The resulting Cr–Si–N films consisted of nanocrystallite CrN grains embedded in amorphous SiNx phase. Nanoindentation tests showed that with increasing nitrogen partial pressure the hardness of the Cr–Si–N films increased and the elastic modulus decreased. Wear experiments showed that the Cr–Si–N films produced at …
Load-Bearing Capacity Of Footing Resting On Multilayer Reinforced Fly Ash Slope, K S. Gill, A K. Choudhary, J N. Jha, S K. Shukla
Load-Bearing Capacity Of Footing Resting On Multilayer Reinforced Fly Ash Slope, K S. Gill, A K. Choudhary, J N. Jha, S K. Shukla
Research outputs 2011
In several parts of the world, disposal of waste materials like fly ash is a great problem. Applications of some waste materials as structural fills in foundations is one of the best solutions to disposal problems, because wastes can be used in large volumes. There may be difficulty due to poor load-bearing capacity of fly ash, especially when footings are rested on the top of the fly ash fill slope; but inclusion of polymeric reinforcements as horizontal sheets within the fill may be one of the most viable solutions to improving the load-bearing capacity of reinforced fly ash slope. The …
Load-Bearing Capacity Of The Footing Resting On A Reinforced Fly Ash Slope, K S. Gill, J N. Choudhary, J N. Jha, Sanjay K. Shukla
Load-Bearing Capacity Of The Footing Resting On A Reinforced Fly Ash Slope, K S. Gill, J N. Choudhary, J N. Jha, Sanjay K. Shukla
Research outputs 2011
In several parts of the world, disposal of waste materials such as fly ash is a great problem. Application of waste materials as structural fills in foundations is one of the best solutions to disposal problems, because wastes can be used in large volumes in such applications. There may be difficulty due to poor load-bearing capacity of fly ash, especially when footing rests on the top of the fly ash fill slope. Inclusion of polymeric reinforcements as horizontal sheets within the fill may be one of the most viable solutions to improving the load-bearing capacity of reinforced fly ash slope, …
Garnet Multilayer Thin Film Structure With Magnetostatically-Altered And Improved Magnetic Properties Prepared By Rf Magnetron Sputtering, Mohammad Nur-E-Alam, Mikhail Vasiliev, Viacheslav Kotov, Kamal Alameh
Garnet Multilayer Thin Film Structure With Magnetostatically-Altered And Improved Magnetic Properties Prepared By Rf Magnetron Sputtering, Mohammad Nur-E-Alam, Mikhail Vasiliev, Viacheslav Kotov, Kamal Alameh
Research outputs 2011
We prepare an all-garnet multilayer film structure by sandwiching a magneto-soft garnet material in between two magneto-hard garnet materials with high bismuth substitution levels using RF magnetron sputtering technique and investigate the microstructure and the effects of magnetostatic inter-layer coupling on magnetic properties. Both types of the Bi-substituted magneto-optic garnet materials used possess excellent optical, magnetic and magneto-optical properties suitable for the application in different new and emerging technologies in optics and photonics. Garnet layers of composition type Bi2Dy1Fe4Ga1O12 have strong perpendicular magnetic anisotropy and Bi1.8Lu1.2Fe3.6Al1.4O12 magneto-soft layer features magnetization behavior similar to that of in-plane magnetized films. The all-garnet …
Optical Fibre Communications And Sensing System Experiments For Undergraduate Photonics Laboratories, Graham Wild, Geoffrey Swan
Optical Fibre Communications And Sensing System Experiments For Undergraduate Photonics Laboratories, Graham Wild, Geoffrey Swan
Research outputs 2011
Experiments in photonics tend to be reserved for postgraduate laboratories, where suitable equipment and resources are available. Simple optical fibre experiments may be included in some undergraduate programs, possibly utilising polymer optical fibres with LEDs and phototransistors, or with the use of bulk optical components and glass optical fibre elements. However, real optical fibre communication systems and optical fibre sensing systems utilise more complex devices, such as optical fibre Bragg gratings. With the availability of optical components in the 850nm wavelength range, a variety of practical systems can be realised using industry standard components. We show how to mitigate a …
Adaptive Noise Canceller For Magnetocardiography, Valentina Tiporlini, Ngiah Nguyen, Kamal Alameh
Adaptive Noise Canceller For Magnetocardiography, Valentina Tiporlini, Ngiah Nguyen, Kamal Alameh
Research outputs 2011
This paper discusses the use of adaptive noise cancellation in magnetocardiography system within unshielded environment using three algorithms: Least-Mean Squared (LMS) algorithm; normalized LMS (nLMS) algorithm and Genetic Algorithms (GA). Simulation results show that for low signal-to-noise ratio (SNR) values, the GA algorithm outperforms the other algorithms, displaying an improvement in SNR of 51.155 dB and completely suppressing the noise sources at 60 Hz and at low frequencies. However, the convergence time of the GA algorithm is longer due to the high computational complexity.
Photonic Microwave Filter Employing An Opto-Vlsi-Based Adaptive Optical Combiner, Haithem Mustafa, Feng Xiao, Kamal Alameh
Photonic Microwave Filter Employing An Opto-Vlsi-Based Adaptive Optical Combiner, Haithem Mustafa, Feng Xiao, Kamal Alameh
Research outputs 2011
A reconfigurable photonic microwave filter structure employing an Opto-VLSI based adaptive optical combiner is proposed and experimentally demonstrated. The Opto-VLSI based adaptive optical combiner is used to combine RF modulated optical signals with a user-defined weight profile to realize a reconfigurable RF photonic filter response. Theoretical simulations are in excellent agreement with the experimental results that demonstrate the concept of the photonic microwave filter structure.
Theory Of The Scattering Of Light And Surface Plasmon Polaritons By Finite-Size Subwavelength Metallic Defects Via Field Decomposition, Guangyuan Li, Feng Xiao, Lin Cai, Kamal Alameh, Anshi Xu
Theory Of The Scattering Of Light And Surface Plasmon Polaritons By Finite-Size Subwavelength Metallic Defects Via Field Decomposition, Guangyuan Li, Feng Xiao, Lin Cai, Kamal Alameh, Anshi Xu
Research outputs 2011
A theoretical model is presented for the scattering of light and surface plasmon polaritons (SPPs) by finite-size subwavelength metallic defects. Based on the decomposition of the scattered fields into SPPs and quasi-cylindrical waves (CWs), an SPP–CW model is developed to depict the multiple scattering of SPPs and CWs in finite-size defects using the elementary scattering processes in a single one. The involved elementary scattering of the CW, as well as the CW-related coefficients, which are difficult or even impossible to define and calculate according to classical scattering theory, is clarified. A close relationship between the scattering coefficients of the SPP …
Design Of Modular Fixtures Using A 3d-Modelling Approach, U Farhan, M Tolouei-Rad
Design Of Modular Fixtures Using A 3d-Modelling Approach, U Farhan, M Tolouei-Rad
Research outputs 2011
The need for improved productivity and reduced time to market has been increased significantly in manufacturing processes in recent decades. There are many factors that play a role in providing manufacturing processes with more productivity. One is the use of modular fixtures (MFs). MFs have brought many benefits to manufacturing industries including reduced costs and times of production. An MF can be defined as a complete system that consist different elements for effectively and securely holding the workpiece in place for performing various machining operations. Generally an MF is made by assembling a number of fixture elements in a feasible …
Upgrade A Medium Size Enterprise Power System With Wind And Solar Sources: Design, Financial And Environmental Perspectives, Thair Mahmoud, Daryoush Habibi, Octavian Bass
Upgrade A Medium Size Enterprise Power System With Wind And Solar Sources: Design, Financial And Environmental Perspectives, Thair Mahmoud, Daryoush Habibi, Octavian Bass
Research outputs 2011
Efficient generation and distribution are crucial for economic power production. In this paper we discuss the planning and design of upgrading a medium size enterprise power system by installing Distributed Energy Resources (DERs), with particular emphasis on economic viability and environmental benefits. The planning for this project considers both conventional grid and SmartGrid connections. Project planning, installation challenges and governmental support of renewable energy projects in Australia are discussed. It is found that upgrading a medium size enterprise power system with DERs can yield reasonable levels of energy cost savings and greenhouse gas mitigation with both conventional grid and SmartGrid …
Tuning Fuzzy Systems To Achieve Economic Dispatch For Microgrids, Thair Mahmoud, Daryoush Habibi, Octavian Bass, Stefan W. Lachowicz
Tuning Fuzzy Systems To Achieve Economic Dispatch For Microgrids, Thair Mahmoud, Daryoush Habibi, Octavian Bass, Stefan W. Lachowicz
Research outputs 2011
In this paper, a Tuning Fuzzy System (TFS) is used to improve the energy demand forecasting for a medium-size microgrid. As a case study, the energy demand of the Joondalup Campus of Edith Cowan University (ECU) in Western Australia is modelled. The developed model is required to perform economic dispatch for the ECU microgrid in islanding mode. To achieve an active economic dispatch demand prediction model, actual load readings are considered. A fuzzy tuning mechanism is added to the prediction model to enhance the prediction accuracy based on actual load changes. The demand prediction is modelled by a Fuzzy Subtractive …
Load Demand Forecasting: Model Inputs Selection, Thair Mahmoud, Daryoush Habibi, Octavian Bass, Stefan W. Lachowicz
Load Demand Forecasting: Model Inputs Selection, Thair Mahmoud, Daryoush Habibi, Octavian Bass, Stefan W. Lachowicz
Research outputs 2011
Developing a good demand forecasting model is the art of identifying the best modelling parameters. Improving the forecasting performance needs to study the input/output parameters of the system to identify the effective forecasting variables. In this paper, the energy demand of Joondalup Campus of Edith Cowan University (ECU) in Western Australia has been selected as a case study for the design and verification of a suitable forecasting model. Fuzzy Subtractive Clustering Method (FSCM) based Adaptive Neuro Fuzzy Inference System (ANFIS) is used as a proposed modelling network in this paper. Basically, three-input forecasting models have been developed based on 12-month …
Nano-Patterned High-Responsivity Gaas Metal-Semiconductor-Metal Photodetector, Ayman Karar, Chee Leong Tan, Kamal Alameh, Yong Tak Lee
Nano-Patterned High-Responsivity Gaas Metal-Semiconductor-Metal Photodetector, Ayman Karar, Chee Leong Tan, Kamal Alameh, Yong Tak Lee
Research outputs 2011
In this paper, we use the finite difference time-domain (FDTD) method to optimize the light absorption of an ultrafast nano-grating plasmonic GaAs metal-semiconductor-metal photodetector (MSM-PD) employing double metal nano-gratings. The geometry of the MSM-PD is theoretically investigated, leading to improved light absorption near the design wavelength of GaAs due to plasmon-assisted electric and magnetic field concentration through a subwavelength aperture. Simulation results show up to 8- and 21-times light absorption enhancement for the single and double nano-grating structure, respectively, in comparison to conventional MSM-PDs. Experimentally, more than 4 times enhancement in photocurrent is demonstrated for a single top nano-grating MSM-PD …
Simulation Of A Mobile Robot Navigation System, Ahmed Khusheef, Ganesh Kothapalli, Majid Tolouei Rad
Simulation Of A Mobile Robot Navigation System, Ahmed Khusheef, Ganesh Kothapalli, Majid Tolouei Rad
Research outputs 2011
Mobile robots are used in various application areas including manufacturing, mining, military operations, search and rescue missions and so on. As such there is a need to model robot mobility that tracks robot system modules such as navigation system and visi on based object recognition. For the navigation system it is important to locate the position of the robot in surr ounding environment. Then it has to plan a path towards desired destination. The navigation system of a robot has to identify all potential obstacles in order to find a suitable path. The objective of this research is to develop …
Design Of Laser Multi-Beam Generator For Plant Discrimination, Sreten Askraba, Arie Paap, Kamal Alameh, John Rowe
Design Of Laser Multi-Beam Generator For Plant Discrimination, Sreten Askraba, Arie Paap, Kamal Alameh, John Rowe
Research outputs 2011
Optimisation of the optical signal from the laser multi-spot beam generator employed in a photonic based real-time plant discrimination sensor for use in selective herbicide spraying systems is presented. The plant detection sensor uses a three-wavelength laser diode module that sequentially emits identically-polarized laser light beams through a common aperture, along one optical path. Each laser beam enters a multi-spot beam generator which produces 15 parallel laser beams over a 240mm span. The intensity of the reflected light from each spot is detected by a high-speed line scan image sensor. Plant discrimination is based on calculating the slope of the …
High-Responsivity Plasmonics-Based Gaas Metal-Semiconductor-Metal Photodetectors, Ayman Karar, Narottam Das, Chee Leongtan, Kamal Alameh, Yong Tak Lee, Fouad Karouta
High-Responsivity Plasmonics-Based Gaas Metal-Semiconductor-Metal Photodetectors, Ayman Karar, Narottam Das, Chee Leongtan, Kamal Alameh, Yong Tak Lee, Fouad Karouta
Research outputs 2011
We report the experimental characterization of high-responsivity plasmonics-based GaAs metal-semiconductor-metal photodetector (MSM-PD) employing metal nano-gratings. Both the geometry and light absorption near the designed wavelength are theoretically and experimentally investigated. The measured photocurrent enhancement is 4-times in comparison with a conventional single-slit MSM-PD. We observe reduction in the responsivity as the bias voltage increases and the input light polarization varies. Our experimental results demonstrate the feasibility of developing a high-responsivity, low bias-voltage high-speed MSM-PD.
An Optimal Current Control Strategy For A Three-Phase Grid-Connected Photovoltaic System Using Particle Swarm Optimization, Waleed Al-Saedi, Stefan W. Lachowicz, Daryoush Habibi
An Optimal Current Control Strategy For A Three-Phase Grid-Connected Photovoltaic System Using Particle Swarm Optimization, Waleed Al-Saedi, Stefan W. Lachowicz, Daryoush Habibi
Research outputs 2011
A robust current control strategy for PV (photovoltaic) grid-connected systems is required for reliable use of solar energy as an abundant and clean renewable energy. This paper presents real time optimization parameters of the current control strategy for a 3-phase photovoltaic grid-connected Voltage Source Inverter (VSI) system. The proposed controller scheme is implemented based on a synchronous reference frame; the Phase-Locked Loop (PLL) is used as grid phase detector. Particle Swarm Optimization (PSO) algorithm is an intelligent searching algorithm that is used to implement the real time self-tuning method for the current control parameters. Two conventional PI controllers are used …
Power Quality Improvement In Autonomous Microgrid Operation Using Particle Swarm Optimization, Waleed Al-Saedi, Stefan W. Lachowicz, Daryoush Habibi, Octavian Bass
Power Quality Improvement In Autonomous Microgrid Operation Using Particle Swarm Optimization, Waleed Al-Saedi, Stefan W. Lachowicz, Daryoush Habibi, Octavian Bass
Research outputs 2011
This paper presents an optimal power control strategy for an autonomous microgrid operation based on a real-time self-tuning method. The purpose of this work is to improve the quality of power supply where Distributed Generation (DG) units are connected to the grid. Dynamic response and harmonics distortion are the two main performance parameters which are considered in this work, particularly when the microgrid is islanded. The controller scheme is composed of an inner current control loop and an outer power control loop based on a synchronous reference frame and the conventional PI regulators. Particle Swarm Optimization (PSO) is an intelligent …
Corrosion Behaviour Of Nanocomposite Tisin Coatings On Steel Substrates, Mohammad Ahmed, Paul Munroe, Zhong-Tao Jiang, Xiaoli Zhao, William Rickard, Zhi-Feng Zhou, Lawrence Li, Zonghan Xie
Corrosion Behaviour Of Nanocomposite Tisin Coatings On Steel Substrates, Mohammad Ahmed, Paul Munroe, Zhong-Tao Jiang, Xiaoli Zhao, William Rickard, Zhi-Feng Zhou, Lawrence Li, Zonghan Xie
Research outputs 2011
Nanocomposite TiSiN coatings were deposited on tool steels. Detailed mechanisms that govern the corrosion of these coated steels were revealed, following immersion tests in a 70% nitric acid solution. Pitting originated preferentially from coating defect sites and expanded with increasing immersion time. Both Young’s modulus and hardness measured by nanoindentation decreased as the corrosion damage intensified. A thin oxide layer formed from the thermal annealing of the as-deposited samples at 900 °C was found to be effective against corrosive attack. In addition, compressive residual stress was noted to suppress the propagation of corrosion-induced cracks. The role of residual stress in …
Metal-Semiconductor-Metal (Msm) Photodetectors With Plasmonic Nanogratings, Narottam K. Das, Ayman Karar, C L Tan, Mikhail Vasiliev, Kamal Alameh, Yong Tak Lee
Metal-Semiconductor-Metal (Msm) Photodetectors With Plasmonic Nanogratings, Narottam K. Das, Ayman Karar, C L Tan, Mikhail Vasiliev, Kamal Alameh, Yong Tak Lee
Research outputs 2011
We discuss the light absorption enhancement factor dependence on the design of nanogratings inscribed into metal-semiconductor-metal photodetector (MSM-PD) structures. These devices are optimized geometrically, leading to light absorption improvement through plasmon-assisted effects. Finite-difference time-domain (FDTD) simulation results show ~50 times light absorption enhancement for 850 nm light due to improved optical signal propagation through the nanogratings. Also, we show that the light absorption enhancement is strongly dependent on the nanograting shapes in MSM-PDs.