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Full-Text Articles in Engineering

Analysis Of Individual Molecular Dynamics Snapshots Simulating Wetting Of Surfaces Using Spheroidal Geometric Constructions, Aleksandr Abramov, Stefan Iglauer Aug 2019

Analysis Of Individual Molecular Dynamics Snapshots Simulating Wetting Of Surfaces Using Spheroidal Geometric Constructions, Aleksandr Abramov, Stefan Iglauer

ECU Publications Post 2013

Accurate characterization of wettability of minerals is important for efficient oil recovery and carbon geosequestration. In studies where molecular dynamics simulations are used to compute the contact angle, emphasis is often placed on results or theoretical details of the simulations themselves, overlooking potentially applicable methodologies for determination of the contact angle. In this manuscript, a concept of a method utilizing spheroidal geometric constructions to estimate the contact angle of a water droplet on a silica surface in carbon dioxide atmosphere is outlined and applied to the final snapshots of two molecular dynamics simulation runs. Two carbon dioxide pressures and two ...


Smart Charging Strategies For Electric Vehicle Charging Stations, Zeinab Moghaddam Jun 2019

Smart Charging Strategies For Electric Vehicle Charging Stations, Zeinab Moghaddam

Theses: Doctorates and Masters

Although the concept of transportation electrification holds enormous prospects in addressing the global environmental pollution problem, consumer concerns over the limited availability of charging stations and long charging/waiting times are major contributors to the slow uptake of plug-in electric vehicles (PEVs) in many countries. To address the consumer concerns, many countries have undertaken projects to deploy a network of both fast and slow charging stations, commonly known as electric vehicle charging networks.

While a large electric vehicle charging network will certainly be helpful in addressing PEV owners' concerns, the full potential of this network cannot be realised without the ...


Smart Management Strategies Of Utility-Scale Energy Storage Systems In Power Networks, Choton Kanti Das Jun 2019

Smart Management Strategies Of Utility-Scale Energy Storage Systems In Power Networks, Choton Kanti Das

Theses: Doctorates and Masters

Power systems are presently experiencing a period of rapid change driven by various interrelated issues, e.g., integration of renewables, demand management, power congestion, power quality requirements, and frequency regulation. Although the deployment of Energy Storage Systems (ESSs) has been shown to provide effective solutions to many of these issues, misplacement or non-optimal sizing of these systems can adversely affect network performance. This present research has revealed some novel working strategies for optimal allocation and sizing of utility-scale ESSs to address some important issues of power networks at both distribution and transmission levels. The optimization strategies employed for ESS placement ...


An Integrated Model To Use Drilling Modular Machine Tools, Ana Vafadar, Majid Tolouei-Rad, Kevin Hayward Jun 2019

An Integrated Model To Use Drilling Modular Machine Tools, Ana Vafadar, Majid Tolouei-Rad, Kevin Hayward

ECU Publications Post 2013

Modular machine tools provide a platform for drilling-related operations within automotive companies. The use of these machine tools is widespread; however, manufacturers wishing to use this technology frequently face the challenge of selecting the most appropriate manufacturing system. Accordingly, a comprehensive feasibility analysis procedure is required to assist decision-makers before any investment is made on the preparation of detailed machine design or purchase one. This paper presents a model, which collects the previous works of the authors. To do this, an integrated framework for decision-making of using machine tools is developed. The aim of this model is to enable users ...


Pt Nanoparticles Decorated Heterostructured G-C3n4/Bi2moo6 Microplates With Highly Enhanced Photocatalytic Activities Under Visible Light, Z. Jia, F. Lyu, Laichang Zhang, S. Zeng, Shunxing Liang, Y. Y. Li, J. Lu May 2019

Pt Nanoparticles Decorated Heterostructured G-C3n4/Bi2moo6 Microplates With Highly Enhanced Photocatalytic Activities Under Visible Light, Z. Jia, F. Lyu, Laichang Zhang, S. Zeng, Shunxing Liang, Y. Y. Li, J. Lu

ECU Publications Post 2013

Exploring an efficient and photostable heterostructured photocatalyst is a pivotal scientific topic for worldwide energy and environmental concerns. Herein, we reported that Pt decorated g-C3N4/Bi2MoO6 heterostructured composites with enhanced photocatalytic performance under visible light were simply synthesized by one-step hydrothermal method for methylene blue (MB) dye degradation. Results revealed that the synthetic Pt decorated g-C3N4/Bi2MoO6 composites with Bi2MoO6 contents of 20 wt.% (Pt@CN/20%BMO) presented the highest photocatalytic activity, exhibiting 7 and 18 times higher reactivity than the pure g-C3 ...


Low-Cost Carbon Fibre Derived From Sustainable Coal Tar Pitch And Polyacrylonitrile: Fabrication And Characterisation, Omid Zabihi, Sajjad Shafei, Seyed Mousa Fakhrhoseini, Mojtaba Ahmadi, Hossein Ajdari Nazarloo, Rohan Stanger, Quang Anh Tran, John Lucas, Terry Wall, Minoo Naebe Apr 2019

Low-Cost Carbon Fibre Derived From Sustainable Coal Tar Pitch And Polyacrylonitrile: Fabrication And Characterisation, Omid Zabihi, Sajjad Shafei, Seyed Mousa Fakhrhoseini, Mojtaba Ahmadi, Hossein Ajdari Nazarloo, Rohan Stanger, Quang Anh Tran, John Lucas, Terry Wall, Minoo Naebe

ECU Publications Post 2013

Preparation of high-value pitch-based carbon fibres (CFs) from mesophase pitch precursor is of great importance towards low-cost CFs. Herein, we developed a method to reduce the cost of CFs precursor through incorporating high loading of coal tar pitch (CTP) into polyacrylonitrile (PAN) polymer solution. The CTP with a loading of 25% and 50% was blended with PAN and their spinnability was examined by electrospinning process. The effect of CTP on thermal stabilization and carbonisation of PAN fibres was investigated by thermal analyses methods. Moreover, electrospun PAN/CTP fibres were carbonised at two different temperatures i.e., 850 °C and 1200 ...


A Review Of The Enhancement Of Bio-Hydrogen Generation By Chemicals Addition, Yong Sun, Jun He, Gang Yang, Guangzhi Sun, Valérie Sage Apr 2019

A Review Of The Enhancement Of Bio-Hydrogen Generation By Chemicals Addition, Yong Sun, Jun He, Gang Yang, Guangzhi Sun, Valérie Sage

ECU Publications Post 2013

Bio-hydrogen production (BHP) produced from renewable bio-resources is an attractive route for green energy production, due to its compelling advantages of relative high efficiency, cost-effectiveness, and lower ecological impact. This study reviewed different BHP pathways, and the most important enzymes involved in these pathways, to identify technological gaps and effective approaches for process intensification in industrial applications. Among the various approaches reviewed in this study, a particular focus was set on the latest methods of chemicals/metal addition for improving hydrogen generation during dark fermentation (DF) processes; the up-to-date findings of different chemicals/metal addition methods have been quantitatively evaluated ...


The Effect Of Fine And Coarse Recycled Aggregates On Fresh And Mechanical Properties Of Self-Compacting Concrete, Mahmoud Nili, Hossein Sasanipour, Farhad Aslani Apr 2019

The Effect Of Fine And Coarse Recycled Aggregates On Fresh And Mechanical Properties Of Self-Compacting Concrete, Mahmoud Nili, Hossein Sasanipour, Farhad Aslani

ECU Publications Post 2013

Today, the use of recycled aggregates as a substitute for a part of the natural aggregates in concrete production is increasing. This approach is essential because the resources for natural aggregates are decreasing in the world. In the present study, the effects of recycled concrete aggregates as a partial replacement for fine (by 50%) and coarse aggregates (by 100%) were examined in the self-compacting concrete mixtures which contain air-entraining agents and silica fumes. Two series of self-compacting concrete mixes have been prepared. In the first series, fine and coarse recycled mixtures respectively with 50% and 100% replacement with air entraining ...


Application Of The Clayff And The Dreiding Force Fields For Modeling Of Alkylated Quartz Surfaces, Aleksandr Abramov, Stefan Iglauer Apr 2019

Application Of The Clayff And The Dreiding Force Fields For Modeling Of Alkylated Quartz Surfaces, Aleksandr Abramov, Stefan Iglauer

ECU Publications Post 2013

To extend applicability and to overcome limitations of combining rules for nonbond potential parameters, in this study, CLAYFF and DREIDING force fields are coupled at the level of atomic site charges to model quartz surfaces with chemisorpt hydrocarbons. Density functional theory and Bader charge analysis are applied to calculate charges of atoms of the OC bond connecting a quartz crystal and an alkyl group. The study demonstrates that the hydrogen atom of the quartz surface hydroxyl group can be removed and its charge can be redistributed among the oxygen and carbon atoms of the OC bond in a manner consistent ...


Development Of Heavyweight Self-Compacting Concrete And Ambient-Cured Heavyweight Geopolymer Concrete Using Magnetite Aggregates, Afsaneh Valizadeh, Farhad Aslani, Zohaib Asif, Matt Roso Mar 2019

Development Of Heavyweight Self-Compacting Concrete And Ambient-Cured Heavyweight Geopolymer Concrete Using Magnetite Aggregates, Afsaneh Valizadeh, Farhad Aslani, Zohaib Asif, Matt Roso

ECU Publications Post 2013

Heavyweight self-compacting concrete (HWSCC) and heavyweight geopolymer concrete (HWGC) are new types of concrete that integrate the advantages of heavyweight concrete (HWC) with self-compacting concrete (SCC) and geopolymer concrete (GC), respectively. The replacement of natural coarse aggregates with magnetite aggregates in control SCC and control GC at volume ratios of 50%, 75%, and 100% was considered in this study to obtain heavyweight concrete classifications, according to British standards, which provide proper protection from sources that emit harmful radiations in medical and nuclear industries and may also be used in many offshore structures. The main aim of this study is to ...


Wettability Of Fully Hydroxylated And Alkylated (001) Α-Quartz Surface In Carbon Dioxide Atmosphere, Aleksandr Abramov, Alireza Keshavarz, Stefan Iglauer Mar 2019

Wettability Of Fully Hydroxylated And Alkylated (001) Α-Quartz Surface In Carbon Dioxide Atmosphere, Aleksandr Abramov, Alireza Keshavarz, Stefan Iglauer

ECU Publications Post 2013

Wettability of alkylated quartz surfaces is of primary importance in several technological applications, including the development of oil and gas reservoirs and carbon geo-sequestration. It is intuitively understood and experimentally confirmed that hydroxylated quartz surfaces are hydrophilic. By gradually saturating a hydroxylated (001) α-quartz surface with pentyl groups, we show using molecular dynamics simulations that the surface can also exhibit extreme hydrophobicity. Within a range of surface pentyl group density from 0.29 to 3.18/nm2, the contact angle of a water droplet under 10 MPa pressure of carbon dioxide at 300 K changes from 10–20 to ...


Mobility Management In 5g Heterogeneous Networks, Mohammad Arifin Rahman Khan Jan 2019

Mobility Management In 5g Heterogeneous Networks, Mohammad Arifin Rahman Khan

Theses: Doctorates and Masters

In recent years, mobile data traffic has increased exponentially as a result of widespread popularity and uptake of portable devices, such as smartphones, tablets and laptops. This growth has placed enormous stress on network service providers who are committed to offering the best quality of service to consumer groups. Consequently, telecommunication engineers are investigating innovative solutions to accommodate the additional load offered by growing numbers of mobile users.

The fifth generation (5G) of wireless communication standard is expected to provide numerous innovative solutions to meet the growing demand of consumer groups. Accordingly the ultimate goal is to achieve several key ...


Wettability Of Quartz Surfaces Under Carbon Dioxide Geo-Sequestration Conditions. A Theoretical Study, Aleksandr Abramov Jan 2019

Wettability Of Quartz Surfaces Under Carbon Dioxide Geo-Sequestration Conditions. A Theoretical Study, Aleksandr Abramov

Theses: Doctorates and Masters

The wettability of rocks under reservoir conditions is important to ensure and secure long term underground storage of carbon dioxide. The composition of those rocks vary significantly and are influenced by the fact that quartz is the second most abundant mineral in the earth's continental crust. Thus, the CO2 wettability of quartz dominates the overall CO2 trapping performance of storage and cap rocks. If depleted oil or gas reservoirs are used for storage of CO2 quartz surfaces of rocks in reservoirs which have been previously exposed to hydrocarbons might be covered with chemisorpt hydrocarbon molecules. The CO2 wettability of ...


Calculation Of Critical Water Flow Rates For Wildfire Suppression, Greg Penney, Daryoush Habibi, Marcus Cattani, Murray Carter Jan 2019

Calculation Of Critical Water Flow Rates For Wildfire Suppression, Greg Penney, Daryoush Habibi, Marcus Cattani, Murray Carter

ECU Publications Post 2013

Predicting water suppression requirements and its impacts on firefighting strategies and logistics within the urban environment has been the subject of many previous studies, however the same level of research has yet to be applied in the realm of wildfire suppression. To work towards addressing this knowledge gap, this paper provides guidance for Incident Controllers in relation to critical water flow rates required to extinguish large wildfire across a wide range of forest fuel loads, fire weather and active fire front depths. This is achieved through mathematical empirical analysis of water flow rates required for head fire suppression during 540 ...


Properties Of Ambient-Cured Normal And Heavyweight Geopolymer Concrete Exposed To High Temperatures, Farhad Aslani, Zohaib Asif Jan 2019

Properties Of Ambient-Cured Normal And Heavyweight Geopolymer Concrete Exposed To High Temperatures, Farhad Aslani, Zohaib Asif

ECU Publications Post 2013

Ambient-cured heavyweight geopolymer concrete (HWGC) is a new type of concrete that combines the benefits of both heavyweight concrete (HWC) and geopolymer concrete (GC). HWGC provides proper protection from the sources that emit harmful radiations in medical and nuclear industries. Furthermore, HWGC may also be used in offshore structures for pipeline ballasting and similar underwater structures. In this study, heavyweight aggregates (magnetite) have been used and replaced by normal-weight coarse aggregates in GC at volume ratios of 50, 75, and 100% to attain heavyweight classification according to British standards. This study investigates the impacts of high temperatures on standard ambient-cured ...


Tio2-Based Photocatalytic Cementitious Composites: Materials, Properties, Influential Parameters, And Assessment Techniques, Fatemeh Hamidi, Farhad Aslani Jan 2019

Tio2-Based Photocatalytic Cementitious Composites: Materials, Properties, Influential Parameters, And Assessment Techniques, Fatemeh Hamidi, Farhad Aslani

ECU Publications Post 2013

Applications of heterogeneous photocatalytic processes based on semiconductor particles in cement-based materials have received great attention in recent years to enhance the aesthetic durability of buildings and reducing global environmental pollution. Amongst all, titanium dioxide (TiO2) is the most widely used semiconductor particle in structural materials with photocatalytic activity because of its low cost, chemically stable nature, and absence of toxicity. Utilization of TiO2 in combination with cement-based materials would plunge the concentration of urban pollutants such as NOx. In fact, cementitious composites containing TiO2 have already found applications in self-cleaning buildings, antimicrobial surfaces, and air-purifying ...


A Numerical Study Of Axisymmetric Wave Propagation In Buried Fluid-Filled Pipes For Optimizing The Vibro-Acoustic Technique When Locating Gas Pipelines, Ying Liu, Daryoush Habibi, Douglas Chai, Xiuming Wang, Hao Chen Jan 2019

A Numerical Study Of Axisymmetric Wave Propagation In Buried Fluid-Filled Pipes For Optimizing The Vibro-Acoustic Technique When Locating Gas Pipelines, Ying Liu, Daryoush Habibi, Douglas Chai, Xiuming Wang, Hao Chen

ECU Publications Post 2013

Buried pipeline systems play a vital role in energy storage and transportation, especially for fluid energies like water and gas. The ability to locate buried pipes is of great importance since it is fundamental for leakage detection, pipeline maintenance, and pipeline repair. The vibro-acoustic locating method, as one of the most effective detection technologies, has been studied by many researchers. However, previous studies have mainly focused on vibro-acoustic propagation in buried water pipes. Limited research has been conducted on buried gas pipes. In this paper, the behavior of gas-dominated wave motion will be investigated and compared against water-dominated wave motion ...


Residual Trapping Of Co2 In An Oil-Filled, Oil-Wet Sandstone Core: Results Of Three-Phase Pore-Scale Imaging, Stefan Iglauer, Adriana Paluszny, Taufiq Rahman, Yihuai Zhang, Wolfgang Wülling, Maxim Lebedev Jan 2019

Residual Trapping Of Co2 In An Oil-Filled, Oil-Wet Sandstone Core: Results Of Three-Phase Pore-Scale Imaging, Stefan Iglauer, Adriana Paluszny, Taufiq Rahman, Yihuai Zhang, Wolfgang Wülling, Maxim Lebedev

ECU Publications Post 2013

CO2 geosequestration in oil reservoirs is an economically attractive solution as it can be combined with enhanced oil recovery (CO2-EOR). However, the effectiveness of the associated three-phase displacement processes has not been tested at the micrometer pore scale, which determines the overall reservoir-scale fluid dynamics and thus CO2-EOR project success. We thus imaged such displacement processes in situ in 3-D with X-ray microcomputed tomography at high resolution at reservoir conditions and found that oil extraction was enhanced substantially, while a significant residual CO2 saturation (13.5%) could be achieved in oil-wet rock. Statistics of the residual CO2 and oil clusters ...


Stability Analysis And Design Charts For A Sandy Soil Slope Supporting An Embedded Strip Footing, Emmanuel Baah-Frempong, Sanjay Kumar Shukla Jan 2019

Stability Analysis And Design Charts For A Sandy Soil Slope Supporting An Embedded Strip Footing, Emmanuel Baah-Frempong, Sanjay Kumar Shukla

ECU Publications Post 2013

In several field situations, especially in the hilly terrains, the construction of footings on slopes becomes essential. The factor of safety of a slope supporting a loaded footing on the crest is dependent on the position of the footing from the crest edge. Most studies in the past have focused on analysing the bearing capacity and settlement behaviour of a footing resting on a slope crest, but foundations in most infrastructure projects are usually built at some depth below the ground surface. Therefore, the availability of some form of design charts for determining the factor of safety of a slope ...


Effective Plant Discrimination Based On The Combination Of Local Binary Pattern Operators And Multiclass Support Vector Machine Methods, Vi N T Le, Beniamin Apopei, Kamal Alameh Jan 2019

Effective Plant Discrimination Based On The Combination Of Local Binary Pattern Operators And Multiclass Support Vector Machine Methods, Vi N T Le, Beniamin Apopei, Kamal Alameh

ECU Publications Post 2013

Accurate crop and weed discrimination plays a critical role in addressing the challenges of weed management in agriculture. The use of herbicides is currently the most common approach to weed control. However, herbicide resistant plants have long been recognised as a major concern due to the excessive use of herbicides. Effective weed detection techniques can reduce the cost of weed management and improve crop quality and yield. A computationally efficient and robust plant classification algorithm is developed and applied to the classification of three crops: Brassica napus (canola), Zea mays (maize/corn), and radish. The developed algorithm is based on ...


Real-Time Classification Of Multivariate Olfaction Data Using Spiking Neural Networks, Arnup Vanarse, Adam Osseiran, Alexander Rassau, Therese O'Sullivan, Jonny Lo, Amanda Devine Jan 2019

Real-Time Classification Of Multivariate Olfaction Data Using Spiking Neural Networks, Arnup Vanarse, Adam Osseiran, Alexander Rassau, Therese O'Sullivan, Jonny Lo, Amanda Devine

ECU Publications Post 2013

Recent studies in bioinspired artificial olfaction, especially those detailing the application of spike-based neuromorphic methods, have led to promising developments towards overcoming the limitations of traditional approaches, such as complexity in handling multivariate data, computational and power requirements, poor accuracy, and substantial delay for processing and classification of odors. Rank-order-based olfactory systems provide an interesting approach for detection of target gases by encoding multi-variate data generated by artificial olfactory systems into temporal signatures. However, the utilization of traditional pattern-matching methods and unpredictable shuffling of spikes in the rank-order impedes the performance of the system. In this paper, we present an ...


Noninvasive Diagnosis Of Irritable Bowel Syndrome Via Bowel Sound Features: Proof Of Concept, Xuhao Du, Gary Allwood, K. Mary Webberley, Andrisha-Jade Inderjeeth, Adam Osseiran, Barry James Marshall Jan 2019

Noninvasive Diagnosis Of Irritable Bowel Syndrome Via Bowel Sound Features: Proof Of Concept, Xuhao Du, Gary Allwood, K. Mary Webberley, Andrisha-Jade Inderjeeth, Adam Osseiran, Barry James Marshall

ECU Publications Post 2013

INTRODUCTION: Irritable bowel syndrome (IBS) is a common and debilitating disorder estimated to affect approximately 11% of the world's population. Typically, IBS is a diagnosis of exclusion after patients undergo a costly and invasive colonoscopy to exclude organic disease. Clinician's and researchers have identified a need for a new cost-effective, accurate, and noninvasive diagnostic test for IBS.

METHODS: Using a diagnostic case-control study, we explored the use of bowel sounds to characterize IBS with a view to diagnostic use. We recruited participants with an existing clinical diagnosis of IBS or healthy (asymptomatic) digestive systems. We recorded bowel sounds ...


Optimization Of Well Pad Design And Drilling - Well Clustering, Aleksandr Abramov Jan 2019

Optimization Of Well Pad Design And Drilling - Well Clustering, Aleksandr Abramov

ECU Publications Post 2013

A model accounting for more than 30 parameters of drilling projects, and a computer program to enumerate groupings of the wells of a pad with consequent calculations of technical-economic characteristics, are developed and tested. Seven drilling scenarios for a 24-well pad with different starting oil flow rates for the wells are studied. Optimal well groupings in terms of Net Present Value (NPV) for three discount rates and five oil production decline rates have been found. The results show that: NPV-maximizing well pad designs with unequal (varying) numbers of wells in groups (clusters) may require only slight alterations of existing ...


Design And Synthesis Of A New Mannitol Stearate Ester-Based Aluminum Alkoxide As A Novel Tri-Functional Additive For Poly(Vinyl Chloride) And Its Synergistic Effect With Zinc Stearate, Wenyuan Han, Manqi Zhang, Degang Li, Tianbao Dong, Bing Ai, Jianping Dou, Hongqi Sun Jan 2019

Design And Synthesis Of A New Mannitol Stearate Ester-Based Aluminum Alkoxide As A Novel Tri-Functional Additive For Poly(Vinyl Chloride) And Its Synergistic Effect With Zinc Stearate, Wenyuan Han, Manqi Zhang, Degang Li, Tianbao Dong, Bing Ai, Jianping Dou, Hongqi Sun

ECU Publications Post 2013

Thermal stabilizers, lubricant, and plasticizers are three crucial additives for processing poly(vinyl chloride) (PVC). In this study, a new mannitol stearate ester-based aluminum alkoxide (MSE-Al) was designed and synthesized as a novel additive for PVC. The thermal stability and processing performance of PVC stabilized by MSE-Al were evaluated by the Congo red test, conductivity measurement, thermal aging test, ultravioletevisible (UV–Vis) spectroscopy test, and torque rheometer test. Results showed that the addition of MSE-Al could not only markedly improve the long-term thermal stability of PVC, but also greatly accelerate the plasticizing and decrease the balance torque, which demonstrated that ...


Facile Synthesis Of Di-Mannitol Adipate Ester-Based Zinc Metal Alkoxide As A Bi-Functional Additive For Poly(Vinyl Chloride), Yuepeng Li, Degang Li, Wenyuan Han, Manqi Zhang, Bing Ai, Lipeng Zhang, Hongqi Sun, Zhen Cui Jan 2019

Facile Synthesis Of Di-Mannitol Adipate Ester-Based Zinc Metal Alkoxide As A Bi-Functional Additive For Poly(Vinyl Chloride), Yuepeng Li, Degang Li, Wenyuan Han, Manqi Zhang, Bing Ai, Lipeng Zhang, Hongqi Sun, Zhen Cui

ECU Publications Post 2013

A new di-mannitol adipate ester-based zinc metal alkoxide (DMAE-Zn) was synthesized as a bi-functional poly(vinyl chloride) (PVC) thermal stabilizer for the first time. The materials were characterized with Fourier transform infrared spectroscopy (FT-IR) and thermogravimetric analysis (TGA). Characterization results confirmed the formation of Zn–O bonds in DMAE-Zn, and confirmed that DMAE-Zn had a high decomposition temperature and a low melting point. The thermal stability of DMAE-Zn on PVC also was tested by a conductivity test, a thermal aging test, and a UV-visible spectroscopy (UV-VIS) test. PVC stabilized by DMAE-Zn had a good initial color and excellent long-term stability ...


Phase Interaction Induced Texture In A Plasma Sprayed-Remelted Nicrbsi Coating During Solidification: An Electron Backscatter Diffraction Study, Liang-Yu Chen, Tianxiang Xu, Haiyang Wang, Peng Sang, Sheng Lu, Ze-Xin Wang, Shujin Chen, Lai-Chang Zhang Jan 2019

Phase Interaction Induced Texture In A Plasma Sprayed-Remelted Nicrbsi Coating During Solidification: An Electron Backscatter Diffraction Study, Liang-Yu Chen, Tianxiang Xu, Haiyang Wang, Peng Sang, Sheng Lu, Ze-Xin Wang, Shujin Chen, Lai-Chang Zhang

ECU Publications Post 2013

Although considerable endeavors have been dedicated to investigate the microstructures of the remelting-enhanced NiCrBSi coatings, the textures in the remelted coatings, which may result in property anisotropy, are rarely studied. In this work, the recrystallized fractions, grain orientations and interphase boundaries for Ni, Ni3B and CrB in a plasma sprayed-remelted NiCrBSi coating were investigated by electron backscatter diffraction. The results demonstrate that the texture is induced by phase interaction during solidification. Cooling from the liquid, the firstly formed Ni grains possess a cube fiber texture of {001}〈001〉. The successively formed Ni3B colonies are randomly oriented ...


Degradation And Hydrate Phase Equilibria Measurement Methods Of Monoethylene Glycol, Khalid Alef, Stefan Iglauer, Ahmed Barifcani Jan 2019

Degradation And Hydrate Phase Equilibria Measurement Methods Of Monoethylene Glycol, Khalid Alef, Stefan Iglauer, Ahmed Barifcani

ECU Publications Post 2013

Monoethylene glycol (MEG), a common chemical used for the inhibition of gas hydrate formation may undergo degradation in the regeneration/reclamation process. Limited research exists on the effect of degradation of MEG on hydrate formation, production facilities and equipment especially in the presence of other chemical additives. The proposed method allows for streamlining the process of preparing, degrading and analysis of MEG solutions for hydrate testing and degradation products.

Procedure to prepare accurate MEG solutions avoiding oxidative degradation of MEG (i.e., controlling oxygen ingress).

Two methods are suggested to mimic field-like degradation of MEG solutions (i.e., degradation by ...


Effect Of Al Alloying On Cavitation Erosion Behavior Of Tasi2 Nanocrystalline Coatings, Jiang Xu, Shuai Kang Zhang, Xiao Lin Lu, Shuyun Jiang, Paul Munroe, Zong-Han Xie Jan 2019

Effect Of Al Alloying On Cavitation Erosion Behavior Of Tasi2 Nanocrystalline Coatings, Jiang Xu, Shuai Kang Zhang, Xiao Lin Lu, Shuyun Jiang, Paul Munroe, Zong-Han Xie

ECU Publications Post 2013

To broaden the scope of non-aerospace applications for titanium-based alloys, both hexagonal C40 binary TaSi2 and ternary Al alloyed TaSi2 nanocrystalline coatings were exploited to enhance the cavitation erosion resistance of Ti-6Al-4V alloy in acidic environments. To begin with, the roles of Al addition in influencing the structural stability and mechanical properties of hexagonal C40 Ta(Si1-xAlx)2 compounds were modelled using first-principles calculations. The calculated key parameters, such as Pugh's index (B/G ratio), Poisson's ratio, and Cauchy pressures, indicated that there was a threshold value for Al addition, below which the ...


A Hardware-Deployable Neuromorphic Solution For Encoding And Classification Of Electronic Nose Data, Anup Vanarse, Alexander Rassau, Peter Van Der Made Jan 2019

A Hardware-Deployable Neuromorphic Solution For Encoding And Classification Of Electronic Nose Data, Anup Vanarse, Alexander Rassau, Peter Van Der Made

ECU Publications Post 2013

In several application domains, electronic nose systems employing conventional data processing approaches incur substantial power and computational costs and limitations, such as significant latency and poor accuracy for classification. Recent developments in spike-based bio-inspired approaches have delivered solutions for the highly accurate classification of multivariate sensor data with minimized computational and power requirements. Although these methods have addressed issues related to efficient data processing and classification accuracy, other areas, such as reducing the processing latency to support real-time application and deploying spike-based solutions on supported hardware, have yet to be studied in detail. Through this investigation, we proposed a spiking ...


Particle Size-Dependent Microstructure, Hardness And Electrochemical Corrosion Behavior Of Atmospheric Plasma Sprayed Nicrbsi Coatings, Peng Sang, Liang-Yu Chen, Cuihua Zhao, Ze-Xin Wang, Haiyang Wang, Sheng Lu, Dongpo Song, Jia-Huan Xu, Lai-Chang Zhang Jan 2019

Particle Size-Dependent Microstructure, Hardness And Electrochemical Corrosion Behavior Of Atmospheric Plasma Sprayed Nicrbsi Coatings, Peng Sang, Liang-Yu Chen, Cuihua Zhao, Ze-Xin Wang, Haiyang Wang, Sheng Lu, Dongpo Song, Jia-Huan Xu, Lai-Chang Zhang

ECU Publications Post 2013

Particle size is a critical consideration for many powder coating-related industries since it significantly influences the properties of the produced materials. However, the effect of particle size on the characteristics of plasma sprayed NiCrBSi coatings is not well understood. This work investigates the microstructures, hardness and electrochemical corrosion behavior of plasma sprayed NiCrBSi coatings synthesized using different-sized powders. All coatings mainly consist of Ni, N3B, CrB, Cr7C3 and Cr3C2 phases. The coatings produced by small particles (50–75 μm) exhibit lower porosity (2.0 ± 0.8%). Such coatings show a higher fraction (15.5 vol.%) of the amorphous phase and ...