donavan marney - Academia.edu (original) (raw)
Papers by donavan marney
This material is posted here with permission of the IEEE. Such permission of the IEEE does not in... more This material is posted here with permission of the IEEE. Such permission of the IEEE does not in any way imply IEEE endorsement of any of UWSRA's products or services. Internal or personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution must be obtained from the IEEE by writing to
Biological corrosion is a process whereby deterioration of a metal occurs directly or indirectly ... more Biological corrosion is a process whereby deterioration of a metal occurs directly or indirectly due to the activity of, and interaction with, living organisms such as bacteria or algae. Micro-organisms can influence corrosion to occur at much higher rates than normally anticipated, leading to premature and sometimes catastrophic failure. This phenomenon is known as microbial influenced corrosion (MIC). MIC can accelerate corrosion in buried carbon steel pipes in small, isolated areas causing reduced pipe performance and ultimately failure and thus disruption to potable water services. While there is a detailed knowledge base of the electrochemical processes associated with the corrosion of carbon steel in a wide variety of conditions and uses, limited research has previously been undertaken into understanding the specific processes when bacteria are involved. This project aims to study the fundamental processes relating to how bacteria influence the electrochemical processes of ste...
Materials and Corrosion, 2015
Solid agar based gels have been investigated as an electrolyte system for the electrochemical stu... more Solid agar based gels have been investigated as an electrolyte system for the electrochemical study of soil corrosion, specifically microbiologically influenced corrosion (MIC) in soil. Traditional techniques for studying corrosion in soil include solutions and soil samples; however these systems do not reliably simulate the physico‐chemical properties of soil. Soils are complex environments with three phases critical to corrosion (solid‐soil, liquid‐water and gas‐oxygen). Therefore there is a need for a system which replicates and considers this complex environment and its effects on corrosion processes, while reducing inconsistencies and variations associated with moisture and oxygen content in soil. Open circuit potential (OCP) and potentiodynamic scans (PDS) were conducted on carbon steel exposed to solid agar electrolyte with varying oxygen concentrations. Results were analysed using Tafel extrapolation, consistency in anodic‐cathodic trends and optical microscopy of the exposed regions. For the conditions tested, a cathodic shift was seen with the observed corrosion potentials being notably lower than the measured OCPs. Consistency in the anodic‐cathodic trends of the PDS was observed with minimal oxygen conditions. Overall, an agar based gel system has potential as an electrolyte for soil based MIC studies, especially as an analogue for moist clay soils.
ACS Symposium Series, 2005
Measurement Science and Technology
Sensors and Actuators B Chemical
Corrosion of steel potable water pipes buried underground is one of their key means of failure, t... more Corrosion of steel potable water pipes buried underground is one of their key means of failure, though it is often trivialised. General corrosion of buried pipes is minimal and is readily counteracted. In contrast, localised corrosion such as pitting is the primary means of pipes failing. A leading cause of pitting is the action of microbes at the steel/soil interface. This is both difficult to predict and prevent and can lead to leaks and ultimately to failure by bursts. These can be expensive to locate and repair.
Fourth International Conference on Smart Materials and Nanotechnology in Engineering, 2013
ABSTRACT Piezoelectric composite sensors which consist of a ferroelectric ceramic phase and a pol... more ABSTRACT Piezoelectric composite sensors which consist of a ferroelectric ceramic phase and a polymer binder have been the center of interest for offering a distributed sensing mechanism in many industrial applications. This study investigates the effect of PZT surface modification on the mechanical and piezoelectric properties of PZT/epoxy composite sensors. Lead zirconate titanate ceramic powder (PZT-5H) was surface modified to prepare a high PZT content (0-3) piezoelectric composite sensor. Functional groups of the modifiers grafted onto the PZT particle surface served as a bridge into the epoxy matrix, thus creating strong bonds between the matrix and PZT particles. This noticeably improved the dispersion of the PZT phase, allowing the use of large fractions of piezoactive component in the composite. It is demonstrated that the produced piezo-film shows an enhanced poling behavior in that it can be poled with lower voltages under reduced poling times. This is caused by greater levels of microstructural homogeneity in the modified films as well as alteration of interfacial charge characteristics using modifiers' functional groups.
Structural Health Monitoring, 2014
Piezoelectric composites are hybrid materials primarily consisting of polymer matrices and micro-... more Piezoelectric composites are hybrid materials primarily consisting of polymer matrices and micro-sized particles of ferroelectric ceramic. While incorporating high-fraction ceramic particles into composites is indispensable to meet the ever increasing requirement of sensitivity, it is a great challenge to achieve such a high concentration due to processing difficulties. In this study, we developed piezoelectric composites of 0-3 geometry containing 95 wt% (∼73 vol%) lead zirconate titanate particles by modifying the surface of lead zirconate titanate particles with isophorone diisocyanate and polyoxyalkyleneamine (J2000) and compounding them with epoxy resin. The functional groups of J2000 molecules covalently grafted onto the particle surface can react with the matrix, thus creating a robust linkage between the matrix and the particles. This improved the particle dispersion and the interface, enabling the development of a superior composite film with high lead zirconate titanate fr...
Applied Artificial Intelligence, 2014
ABSTRACT Automatic image interpretation for pipe inspection is a relatively recent area of resear... more ABSTRACT Automatic image interpretation for pipe inspection is a relatively recent area of research, which has great potential benefit. An important component of such systems is crack detection, or, more generally, edge or discontinuity detection. This paper describes a new approach to edge detection and applies it to pipe images. The method labels each pixel in an image as an edge pixel or a nonedge pixel by processing the Haar wavelet transform of the image in a window about the pixel using a support vector machine. As a pixel classifier, to within a moderate morphological tolerance, the detector has an accuracy of 99% on the images on which it has been tested and compares favorably with the commonly used Canny edge detector.
2009 Third International Conference on Network and System Security, 2009
This paper presents a method of mining the data obtained by a collection of pressure sensors moni... more This paper presents a method of mining the data obtained by a collection of pressure sensors monitoring a pipe network to obtain information about the location and size of leaks in the network. This inverse engineering problem is effected by support vector machines (SVMs) which act as pattern recognisers. In this study the SVMs are trained and tested on data obtained from the EPANET hydraulic modelling system. Performance assessment of the SVM showed that leak size and location are both predicted with a reasonable degree of accuracy. The information obtained from this SVM analysis would be invaluable to water authorities in overcoming the ongoing problem of leak detection.
Progress in Organic Coatings, 2011
Improvement in both sensor's characteristics and antifouling resistance has been ach... more Improvement in both sensor's characteristics and antifouling resistance has been achieved by utilising Cu2O as a dopant to the sub-micron-sized RuO2 sensing electrode (SE) of the water quality sensors. 20mol% Cu2O-doped RuO2-SE has exhibited a linear response to dissolved oxygen (DO) between 0.5 and 8.0 ppm at various temperatures with the sensitivity slope of− 46mV/decade. This paper describes the structural properties and characteristics of thin-film Cu2O-doped RuO2-SE subjected to a field trial in sewerage environment for ...
AIP Conference Proceedings, 2011
New hand-held robust UV255 sensor for the control of dissolved organic carbon (DOC) in water has ... more New hand-held robust UV255 sensor for the control of dissolved organic carbon (DOC) in water has been developed by CSIRO. The device is designed for compact operation and simplified circuitry. UV 255 sensor exhibited a good liner response at low concentration range of DOC (<5 ppm) and has shown the detection limit less than 10 ppb of DOC. The current
Talanta, 2010
A Cu 2 O-doped RuO 2 sensing electrode (SE) for potentiometric detection of dissolved oxygen (DO)... more A Cu 2 O-doped RuO 2 sensing electrode (SE) for potentiometric detection of dissolved oxygen (DO) was prepared and its structure and electrochemical properties were analyzed by scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron microscopy (XPS) and energy-dispersive spectroscopy (EDS) techniques. Cu 2 O-RuO 2-SE displayed a linear DO response from 0.5 to 8.0 ppm (log[O 2 ],-4.73 to-3.59) within a temperature range of 9-30°C. The maximum sensitivity of-47.4 mV/decade at 7.27 pH was achieved at 10 mol % Cu 2 O. Experimental evaluation of the Cu 2 O-doped RuO 2-SE demonstrated that the doping of RuO 2 not only improves its structure but also enhances both sensor's selectivity and antifouling properties. Selectivity measurements revealed that 10 mol % Cu 2 O-doped RuO 2-SE is insensitive to the presence of Na + , Mg 2+ , K + , Ca 2+ , NO 3-, PO 4 2and SO 4 2ions in the solution in the concentration range of 10-7-10-1 mol/l.
world-comp.org
This paper describes a new approach to discontinuity detection involving the processing by suppor... more This paper describes a new approach to discontinuity detection involving the processing by support vector machine (SVM) of Haar wavelet transforms of local image windows. The method labels each pixel in an image as a pixel of discontinuity or otherwise by processing the Haar wavelet transform of the image in a window about the pixel using an SVM. The pixel labeler is trained using software for labeling training images by a human operator. As a pixel classifier, to within a moderate morphological tolerance, the discontinuity detector has an accuracy of 99% on the images for which it has been tested.
Polymer Degradation and Stability, 2009
Measurement Science and Technology, 2013
ABSTRACT In these studies, planar potentiometric dissolved oxygen (DO) sensors were fabricated. T... more ABSTRACT In these studies, planar potentiometric dissolved oxygen (DO) sensors were fabricated. They are based on sub-micron films of RuO2-Cu2O (20 mol%) and RuO2-ZnO (20 mol%) sensing electrodes (SEs) which were applied to alumina substrates using a screen-printing method and sintered at different temperatures in order to understand the optimum preparation conditions for sensing. To gain insight into their structural and electrochemical sensing properties they were closely examined using scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), atomic force microscopy and cyclic voltammetry (CV). SEM showed that the different sintering temperatures generated contrasting surface morphologies which went some way towards explaining the SE performance. Furthermore, FTIR and CV conducted on the sintered SEs showed differences in the spectra of samples sintered at different temperatures. The relationship between the DO and the electrochemical sensor's response at sintering temperatures of 800 and 850 degrees C was found to be relatively linear for all four sintering temperatures for both RuO2-Cu2O and RuO2-ZnO sub-micron SEs. The experiments conducted confirmed that the optimum results were obtained when the SEs were sintered at 800 and 850 degrees C, respectively. In addition, the correlation between pH and SE response was found to be linear regardless of the sintering temperature of the SE.
This material is posted here with permission of the IEEE. Such permission of the IEEE does not in... more This material is posted here with permission of the IEEE. Such permission of the IEEE does not in any way imply IEEE endorsement of any of UWSRA's products or services. Internal or personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution must be obtained from the IEEE by writing to
Biological corrosion is a process whereby deterioration of a metal occurs directly or indirectly ... more Biological corrosion is a process whereby deterioration of a metal occurs directly or indirectly due to the activity of, and interaction with, living organisms such as bacteria or algae. Micro-organisms can influence corrosion to occur at much higher rates than normally anticipated, leading to premature and sometimes catastrophic failure. This phenomenon is known as microbial influenced corrosion (MIC). MIC can accelerate corrosion in buried carbon steel pipes in small, isolated areas causing reduced pipe performance and ultimately failure and thus disruption to potable water services. While there is a detailed knowledge base of the electrochemical processes associated with the corrosion of carbon steel in a wide variety of conditions and uses, limited research has previously been undertaken into understanding the specific processes when bacteria are involved. This project aims to study the fundamental processes relating to how bacteria influence the electrochemical processes of ste...
Materials and Corrosion, 2015
Solid agar based gels have been investigated as an electrolyte system for the electrochemical stu... more Solid agar based gels have been investigated as an electrolyte system for the electrochemical study of soil corrosion, specifically microbiologically influenced corrosion (MIC) in soil. Traditional techniques for studying corrosion in soil include solutions and soil samples; however these systems do not reliably simulate the physico‐chemical properties of soil. Soils are complex environments with three phases critical to corrosion (solid‐soil, liquid‐water and gas‐oxygen). Therefore there is a need for a system which replicates and considers this complex environment and its effects on corrosion processes, while reducing inconsistencies and variations associated with moisture and oxygen content in soil. Open circuit potential (OCP) and potentiodynamic scans (PDS) were conducted on carbon steel exposed to solid agar electrolyte with varying oxygen concentrations. Results were analysed using Tafel extrapolation, consistency in anodic‐cathodic trends and optical microscopy of the exposed regions. For the conditions tested, a cathodic shift was seen with the observed corrosion potentials being notably lower than the measured OCPs. Consistency in the anodic‐cathodic trends of the PDS was observed with minimal oxygen conditions. Overall, an agar based gel system has potential as an electrolyte for soil based MIC studies, especially as an analogue for moist clay soils.
ACS Symposium Series, 2005
Measurement Science and Technology
Sensors and Actuators B Chemical
Corrosion of steel potable water pipes buried underground is one of their key means of failure, t... more Corrosion of steel potable water pipes buried underground is one of their key means of failure, though it is often trivialised. General corrosion of buried pipes is minimal and is readily counteracted. In contrast, localised corrosion such as pitting is the primary means of pipes failing. A leading cause of pitting is the action of microbes at the steel/soil interface. This is both difficult to predict and prevent and can lead to leaks and ultimately to failure by bursts. These can be expensive to locate and repair.
Fourth International Conference on Smart Materials and Nanotechnology in Engineering, 2013
ABSTRACT Piezoelectric composite sensors which consist of a ferroelectric ceramic phase and a pol... more ABSTRACT Piezoelectric composite sensors which consist of a ferroelectric ceramic phase and a polymer binder have been the center of interest for offering a distributed sensing mechanism in many industrial applications. This study investigates the effect of PZT surface modification on the mechanical and piezoelectric properties of PZT/epoxy composite sensors. Lead zirconate titanate ceramic powder (PZT-5H) was surface modified to prepare a high PZT content (0-3) piezoelectric composite sensor. Functional groups of the modifiers grafted onto the PZT particle surface served as a bridge into the epoxy matrix, thus creating strong bonds between the matrix and PZT particles. This noticeably improved the dispersion of the PZT phase, allowing the use of large fractions of piezoactive component in the composite. It is demonstrated that the produced piezo-film shows an enhanced poling behavior in that it can be poled with lower voltages under reduced poling times. This is caused by greater levels of microstructural homogeneity in the modified films as well as alteration of interfacial charge characteristics using modifiers' functional groups.
Structural Health Monitoring, 2014
Piezoelectric composites are hybrid materials primarily consisting of polymer matrices and micro-... more Piezoelectric composites are hybrid materials primarily consisting of polymer matrices and micro-sized particles of ferroelectric ceramic. While incorporating high-fraction ceramic particles into composites is indispensable to meet the ever increasing requirement of sensitivity, it is a great challenge to achieve such a high concentration due to processing difficulties. In this study, we developed piezoelectric composites of 0-3 geometry containing 95 wt% (∼73 vol%) lead zirconate titanate particles by modifying the surface of lead zirconate titanate particles with isophorone diisocyanate and polyoxyalkyleneamine (J2000) and compounding them with epoxy resin. The functional groups of J2000 molecules covalently grafted onto the particle surface can react with the matrix, thus creating a robust linkage between the matrix and the particles. This improved the particle dispersion and the interface, enabling the development of a superior composite film with high lead zirconate titanate fr...
Applied Artificial Intelligence, 2014
ABSTRACT Automatic image interpretation for pipe inspection is a relatively recent area of resear... more ABSTRACT Automatic image interpretation for pipe inspection is a relatively recent area of research, which has great potential benefit. An important component of such systems is crack detection, or, more generally, edge or discontinuity detection. This paper describes a new approach to edge detection and applies it to pipe images. The method labels each pixel in an image as an edge pixel or a nonedge pixel by processing the Haar wavelet transform of the image in a window about the pixel using a support vector machine. As a pixel classifier, to within a moderate morphological tolerance, the detector has an accuracy of 99% on the images on which it has been tested and compares favorably with the commonly used Canny edge detector.
2009 Third International Conference on Network and System Security, 2009
This paper presents a method of mining the data obtained by a collection of pressure sensors moni... more This paper presents a method of mining the data obtained by a collection of pressure sensors monitoring a pipe network to obtain information about the location and size of leaks in the network. This inverse engineering problem is effected by support vector machines (SVMs) which act as pattern recognisers. In this study the SVMs are trained and tested on data obtained from the EPANET hydraulic modelling system. Performance assessment of the SVM showed that leak size and location are both predicted with a reasonable degree of accuracy. The information obtained from this SVM analysis would be invaluable to water authorities in overcoming the ongoing problem of leak detection.
Progress in Organic Coatings, 2011
Improvement in both sensor&#x27;s characteristics and antifouling resistance has been ach... more Improvement in both sensor&#x27;s characteristics and antifouling resistance has been achieved by utilising Cu2O as a dopant to the sub-micron-sized RuO2 sensing electrode (SE) of the water quality sensors. 20mol% Cu2O-doped RuO2-SE has exhibited a linear response to dissolved oxygen (DO) between 0.5 and 8.0 ppm at various temperatures with the sensitivity slope of− 46mV/decade. This paper describes the structural properties and characteristics of thin-film Cu2O-doped RuO2-SE subjected to a field trial in sewerage environment for ...
AIP Conference Proceedings, 2011
New hand-held robust UV255 sensor for the control of dissolved organic carbon (DOC) in water has ... more New hand-held robust UV255 sensor for the control of dissolved organic carbon (DOC) in water has been developed by CSIRO. The device is designed for compact operation and simplified circuitry. UV 255 sensor exhibited a good liner response at low concentration range of DOC (<5 ppm) and has shown the detection limit less than 10 ppb of DOC. The current
Talanta, 2010
A Cu 2 O-doped RuO 2 sensing electrode (SE) for potentiometric detection of dissolved oxygen (DO)... more A Cu 2 O-doped RuO 2 sensing electrode (SE) for potentiometric detection of dissolved oxygen (DO) was prepared and its structure and electrochemical properties were analyzed by scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron microscopy (XPS) and energy-dispersive spectroscopy (EDS) techniques. Cu 2 O-RuO 2-SE displayed a linear DO response from 0.5 to 8.0 ppm (log[O 2 ],-4.73 to-3.59) within a temperature range of 9-30°C. The maximum sensitivity of-47.4 mV/decade at 7.27 pH was achieved at 10 mol % Cu 2 O. Experimental evaluation of the Cu 2 O-doped RuO 2-SE demonstrated that the doping of RuO 2 not only improves its structure but also enhances both sensor's selectivity and antifouling properties. Selectivity measurements revealed that 10 mol % Cu 2 O-doped RuO 2-SE is insensitive to the presence of Na + , Mg 2+ , K + , Ca 2+ , NO 3-, PO 4 2and SO 4 2ions in the solution in the concentration range of 10-7-10-1 mol/l.
world-comp.org
This paper describes a new approach to discontinuity detection involving the processing by suppor... more This paper describes a new approach to discontinuity detection involving the processing by support vector machine (SVM) of Haar wavelet transforms of local image windows. The method labels each pixel in an image as a pixel of discontinuity or otherwise by processing the Haar wavelet transform of the image in a window about the pixel using an SVM. The pixel labeler is trained using software for labeling training images by a human operator. As a pixel classifier, to within a moderate morphological tolerance, the discontinuity detector has an accuracy of 99% on the images for which it has been tested.
Polymer Degradation and Stability, 2009
Measurement Science and Technology, 2013
ABSTRACT In these studies, planar potentiometric dissolved oxygen (DO) sensors were fabricated. T... more ABSTRACT In these studies, planar potentiometric dissolved oxygen (DO) sensors were fabricated. They are based on sub-micron films of RuO2-Cu2O (20 mol%) and RuO2-ZnO (20 mol%) sensing electrodes (SEs) which were applied to alumina substrates using a screen-printing method and sintered at different temperatures in order to understand the optimum preparation conditions for sensing. To gain insight into their structural and electrochemical sensing properties they were closely examined using scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), atomic force microscopy and cyclic voltammetry (CV). SEM showed that the different sintering temperatures generated contrasting surface morphologies which went some way towards explaining the SE performance. Furthermore, FTIR and CV conducted on the sintered SEs showed differences in the spectra of samples sintered at different temperatures. The relationship between the DO and the electrochemical sensor's response at sintering temperatures of 800 and 850 degrees C was found to be relatively linear for all four sintering temperatures for both RuO2-Cu2O and RuO2-ZnO sub-micron SEs. The experiments conducted confirmed that the optimum results were obtained when the SEs were sintered at 800 and 850 degrees C, respectively. In addition, the correlation between pH and SE response was found to be linear regardless of the sintering temperature of the SE.