ORCID Profile
0000-0001-6701-5694
Current Organisation
Griffith University
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In Research Link Australia (RLA), "Research Topics" refer to ANZSRC FOR and SEO codes. These topics are either sourced from ANZSRC FOR and SEO codes listed in researchers' related grants or generated by a large language model (LLM) based on their publications.
Microelectromechanical Systems (MEMS) | Mechanical Engineering | Manufacturing Engineering | Microelectronics and Integrated Circuits | Microtechnology | Control Systems, Robotics and Automation |
Expanding Knowledge in Engineering | Expanding Knowledge in Technology | Machined Metal Products | Industrial Instruments | Industrial Machinery and Equipment | Medical Instruments | Integrated Circuits and Devices | Integrated Systems
Publisher: IEEE
Date: 2007
Publisher: MDPI AG
Date: 18-02-2022
Abstract: Ultraviolet photodetectors have been widely utilized in several applications, such as advanced communication, ozone sensing, air purification, flame detection, etc. Gallium nitride and its compound semiconductors have been promising candidates in photodetection applications. Unlike polar gallium nitride-based optoelectronics, non-polar gallium nitride-based optoelectronics have gained huge attention due to the piezoelectric and spontaneous polarization effect–induced quantum confined-stark effect being eliminated. In turn, non-polar gallium nitride-based photodetectors portray higher efficiency and faster response compared to the polar growth direction. To date, however, a systematic literature review of non-polar gallium nitride-based photodetectors has yet to be demonstrated. Hence, the objective of this systematic literature review is to critically analyze the data related to non-polar gallium nitride-based photodetectors. Based on the pool of literature, three categories are introduced, namely, growth and fabrication, electrical properties, and structural, morphological, and optical properties. In addition, bibliometric analysis, a precise open-source tool, was used to conduct a comprehensive science mapping analysis of non-polar gallium nitride-based photodetectors. Finally, challenges, motivations, and future opportunities of non-polar gallium nitride-based photodetectors are presented. The future opportunities of non-polar GaN-based photodetectors in terms of growth conditions, fabrication, and characterization are also presented. This systematic literature review can provide initial reading material for researchers and industries working on non-polar gallium nitride-based photodetectors.
Publisher: MDPI AG
Date: 22-05-2022
DOI: 10.3390/S22103926
Abstract: To stabilize the detection signal of palladium-based hydrogen sensors on paper substrates, a graphite intermediate layer was painted on the surface of paper. The graphite-on-paper (GOP) substrate offers advantages such as good thermo-electrical conductivity, low cost, and uncomplicated preparation technology. Quasi-1-dimensional palladium (Pd) thin films with 8 nm and 60 nm thicknesses were deposited on the GOP substrates using the vacuum evaporation technique. Thanks to the unique properties of the GOP substrate, a continuous Pd microfiber network structure appeared after deposition of the ultra-thin Pd film. Additionally, the sensing performance of the palladium-based hydrogen sensor was not affected, whether using GOP or paper substrate at 25 °C. Surprisingly, heating-induced loss of sensitivity was restrained due to the increased electrical conductivity of the GOP substrate at 50 °C.
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 2011
Publisher: IEEE
Date: 12-2017
Publisher: Elsevier BV
Date: 03-2015
Publisher: Institution of Engineering and Technology (IET)
Date: 07-01-2020
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 04-2021
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 07-2008
Publisher: Elsevier BV
Date: 11-2016
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 08-2011
Publisher: Springer International Publishing
Date: 12-2018
Publisher: Springer International Publishing
Date: 12-2018
Publisher: Elsevier BV
Date: 08-2019
Publisher: IEEE
Date: 06-2013
Publisher: IEEE
Date: 2007
Publisher: Informa UK Limited
Date: 20-11-2016
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 2015
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 04-2010
Publisher: AIP Publishing
Date: 20-06-2016
DOI: 10.1063/1.4954262
Abstract: In this letter, modeling, analysis, and experimental investigation for a resonant MEMS switch are presented. The resonant switch harnesses its mechanical resonance to lower the required actuation voltage by a substantial factor over the switch with static actuation. With alternating actuation voltage at its mechanical resonance frequency of 6.6 kHz, the average capacitance is tuned by changing the gap between fixed and movable electrodes. Based on the proposed actuation method, the device offers 57.44% lower actuation voltage compared with the switch with static actuation.
Publisher: Trans Tech Publications, Ltd.
Date: 06-2013
DOI: 10.4028/WWW.SCIENTIFIC.NET/AMR.705.264
Abstract: In this paper RF MEMS switchis designed for dielectric-embedded electronically switched multiple-beam (DE-ESMB) antenna array. To achieve small stiffness without buckling, a novel bidirectional Z-shaped thermal actuator is used instead of V-shaped thermal actuator, which can generate large displacement and high contact force at low actuation voltage. With the actuation current from-0.6 A to 0.6 A, the electrothermal actuator can achieve a bidirectional motion in a dynamic range of-10.08 μm to 10.17 μm.RF performances are improved by suspending the structure 25 μm from the substrate using MetalMumps process. An ON state insertion loss of-0.14 dB at 10 GHz and an OFF state isolation of-67 dB at 10 GHz are achieved on low resistivity silicon substrate.
Publisher: Institution of Engineering and Technology (IET)
Date: 10-2015
DOI: 10.1049/EL.2015.2495
Publisher: IEEE
Date: 10-2009
Publisher: MDPI AG
Date: 06-05-2018
DOI: 10.3390/S18051448
Publisher: IOP Publishing
Date: 12-08-2014
Publisher: IEEE
Date: 2008
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 06-2019
Publisher: IEEE
Date: 06-2013
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 09-2017
Publisher: Research Square Platform LLC
Date: 02-09-2021
DOI: 10.21203/RS.3.RS-870641/V1
Abstract: Thorough understanding of the behaviour of core-shell microparticles with a liquid core is essential for determining their performance in applications under different operation conditions. This paper reports the behaviour of core-shell particles with a liquid core under thermal and mechanical loads. First, we formulated an analytical model for the heating process of a core-shell microparticle with a liquid core. Next, we utilised an axisymmetric model of an elastic spherical shell upon compression to describe the deformation of a core-shell microparticle. Finally, we conducted experiments to validate these models. Both thermal and mechanical models agree well with the experimental data. The maximum temperature a core-shell microparticle can withstand depends on the liquid, the geometry, and the material of the shell. The critical compression force before rupture of a core-shell microparticle depends on the Poisson’s ratio of the shell material and the shell thickness relative to the outer shell radius. The rupture force and rupture temperature increase with increasing shell thickness.
Publisher: IOP Publishing
Date: 14-01-2005
Publisher: Research Square Platform LLC
Date: 15-09-2021
DOI: 10.21203/RS.3.RS-870641/V2
Abstract: Thorough understanding of the behaviour of core-shell microparticles with a liquid core is essential for determining their performance in applications under different operation conditions. This paper reports the behaviour of core-shell particles with a liquid core under thermal and mechanical loads. First, we formulated an analytical model for the heating process of a core-shell microparticle with a liquid core. Next, we utilised an axisymmetric model of an elastic spherical shell upon compression to describe the deformation of a core-shell microparticle. Finally, we conducted experiments to validate these models. Both thermal and mechanical models agree well with the experimental data. The maximum temperature a core-shell microparticle can withstand depends on the liquid, the geometry, and the material of the shell. The critical compression force before rupture of a core-shell microparticle depends on the Poisson’s ratio of the shell material and the shell thickness relative to the outer shell radius. The rupture force and rupture temperature increase with increasing shell thickness.
Publisher: Elsevier BV
Date: 09-2020
Publisher: Trans Tech Publications, Ltd.
Date: 06-2013
DOI: 10.4028/WWW.SCIENTIFIC.NET/AMR.705.258
Abstract: In this paper, a novel MEMS based LLC converter is proposed for on chip power supplies. The design is optimized based on commercially available Metal MUMPs process for fabrication. The resonant frequency is optimized at 20MHz and MEMS based variable capacitor is fabricated on the chip to tune the peak resonance frequency of circuit which varies due to the load variations. The Design is simulated in FEM based numerical software COMSOL and Intellisuite. According to analysis the magnetizing inductance of 42nH and leakage inductance of 40nH has been achieved from 16 mm 2 rectangular coil transformer. The total capacitance of 1500pF has been achieved from parallel plate capacitors and variation of 3pF has been achieved from variable capacitor.
Publisher: MDPI AG
Date: 17-05-2020
DOI: 10.3390/ANI10050865
Abstract: Australia is currently free of canine rabies. Spatio-ecological knowledge about dingoes in northern Australia is currently a gap that impedes the application of disease spread models and our understanding of the potential transmission of rabies, in the event of an incursion. We therefore conducted a one-year camera trap survey to monitor a dingo population in equatorial northern Australia. The population is contiguous with remote Indigenous communities containing free-roaming dogs, which potentially interact with dingoes. Based on the camera trap data, we derived dingo density and home range size estimates using maximum-likelihood, spatially explicit, mark–resight models, described dingo movements and evaluated spatial correlation and temporal overlap in activities between dingoes and community dogs. Dingo density estimates varied from 0.135 animals/km2 (95% CI = 0.127–0.144) during the dry season to 0.147 animals/km2 (95% CI = 0.135–0.159) during the wet season. The 95% bivariate Normal home range sizes were highly variable throughout the year (7.95–29.40 km2). Spatial use and daily activity patterns of dingoes and free-roaming community dogs, grouped over ~3 month periods, showed substantial temporal activity overlap and spatial correlation, highlighting the potential risk of disease transmission at the wild–domestic interface in an area of biosecurity risk in equatorial northern Australia. Our results have utility for improving preparedness against a potential rabies incursion.
Publisher: Wiley
Date: 09-01-2023
DOI: 10.1002/CAE.22605
Abstract: This paper illustrates the teaching approaches to assessment that foster independent learning in an undergraduate course in the discipline of Electrical and Electronic Engineering. A web‐based circuit simulator of CircuitLab was used to implement some of the laboratory tasks. Practical solutions have been applied to bridge the learning achievement gap between the formative laboratory assessment and the summative examination. To promote creative and independent learning, unique in idual self‐discovery projects were given to each student. The projects are generated according to each student's student number in an innovative approach to prevent plagiarism. The scaffolding and self‐discovery lab activities can be modified to be pure online versions, which had been attested in the online course delivery during the COVID‐19 lockdown period in 2020.
Publisher: MDPI AG
Date: 25-07-2022
DOI: 10.3390/S22155555
Abstract: As industries need more real-time monitoring and interconnected systems, the demand for wireless sensors expands. Vibrational energy harvesters are a potential solution for powering these sensors, as vibrations commonly exist where monitoring occurs. Developments in low-power circuitry have also led to the feasibility of these types of harvesters. Electromagnetic harvesters are a standout among various types of vibrational harvesters due to their ability to capture kinetic energy in a low-frequency range. This leads to these devices being more applicable in real-world applications where ambient vibrations are typical of having low frequencies. Hence, extensive research has been undertaken to make electromagnetic harvesters more efficient and compact. This review study aims to examine recent literature that has made advancements and demonstrated the full potential of such devices.
Publisher: Elsevier BV
Date: 08-2016
Publisher: Springer Science and Business Media LLC
Date: 17-02-2014
Publisher: IOP Publishing
Date: 08-03-2017
Abstract: During the last three decades, the remarkable dynamic features of microelectromechanical systems (MEMS) and nanoelectromechanical systems (NEMS), and advances in solid-state electronics hold much potential for the fabrication of extremely sensitive charge sensors. These sensors have a broad range of applications, such as those involving the measurement of ionization radiation, detection of bio-analyte and aerosol particles, mass spectrometry, scanning tunneling microscopy, and quantum computation. Designing charge sensors (also known as charge electrometers) for electrometry is deemed significant because of the sensitivity and resolution issues in the range of micro- and nano-scales. This article reviews the development of state-of-the-art micro- and nano-charge sensors, and discusses their technological challenges for practical implementation.
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 06-2012
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 07-2012
Publisher: Elsevier BV
Date: 05-2019
Publisher: Elsevier BV
Date: 12-2020
Publisher: Springer Science and Business Media LLC
Date: 12-07-2014
Publisher: IOP Publishing
Date: 14-03-2016
Publisher: IOP Publishing
Date: 24-04-2007
Publisher: IEEE
Date: 2018
Publisher: IEEE
Date: 05-2015
Publisher: MDPI AG
Date: 28-05-2021
Abstract: That dogs can live and breed as free-living animals contributes to public health risks including zoonotic transmission, dog bites, and compromising people’s sense of safety in public spaces. In Australia, free-living dog populations are comprised of domestic dogs, dingoes, and dog–dingo hybrids, and are described using various terms (for ex le, stray or community), depending on social or geographic context. Urban expansion and regional migration mean that risks associated with contact between humans and free-living dogs are increasing. Public health authorities, local governments, and community organisations have called for transdisciplinary partnerships to address dog-related health risks with a sustainable long-term approach. Values pluralism and a lack of sustained community engagement in affected areas have meant that the outcome of such efforts to date has been mixed. To identify ideas in public circulation about the impact of unrestrained and free-living dogs on human health and well-being, and understand the framework through which these animals are problematised and solutions are proposed in public discourse, we systematically examined coverage of these issues in print media. Our analyses indicate that reporting in Australian newspapers tends to frame the public health impacts of free-living dogs as problems of public order requiring direct government action to re-establish control. The public health impacts of free-living dog populations in Australia have complex causes that intersect at the nexus between human and canine behaviour, agricultural and land management practices, local bylaws, and efforts to conserve ecological systems. Placing responsibility on governments limits opportunities for greater community involvement in developing integrated One Health approaches. Better-quality evidence of the impacts of dog populations on community health and well-being, and broad community support are needed to reshape public debates on animal control, which, ultimately, will promote more effective approaches to mitigate dog-related public health risks at the human–animal–environment interface.
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 10-2010
Publisher: MDPI AG
Date: 12-11-2021
DOI: 10.3390/MI12111389
Abstract: The authors would like to update the Figure 3 and Figure 7 to the published paper [...]
Publisher: IOP Publishing
Date: 13-05-2008
Publisher: Springer International Publishing
Date: 2016
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 12-2015
Publisher: Elsevier BV
Date: 06-2017
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C7RA11922D
Abstract: This paper presents for the first time a p-type 4H silicon carbide (4H-SiC) van der Pauw strain sensor by utilizing the strain induced effect in four-terminal devices.
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 06-2011
Publisher: IEEE
Date: 11-2010
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 09-2008
Publisher: IEEE
Date: 10-2009
Publisher: AIP Publishing
Date: 03-12-2007
DOI: 10.1063/1.2822405
Abstract: A single-crystal silicon resonant bulk acoustic mass sensor with a measured resolution of 125pg∕cm2 is presented. The mass sensor comprises a micromachined silicon plate that is excited in the square-extensional bulk acoustic resonant mode at a frequency of 2.182MHz, with a quality factor exceeding 106. The mass sensor has a measured mass to frequency shift sensitivity of 132Hzcm2∕μg. The resonator element is embedded in a feedback loop of an electronic lifier to implement an oscillator with a short term frequency stability of better than 7ppb at an operating pressure of 3.8mTorr.
Publisher: MDPI AG
Date: 12-10-2021
DOI: 10.3390/MI12101237
Abstract: In this paper, we report a novel laterally actuated Radio Frequency (RF) Microelectromechanical Systems (MEMS) switch, which is based on a combination of electrothermal actuation and electrostatic latching hold. The switch takes the advantages of both actuation mechanisms: large actuation force, low actuation voltage, and high reliability of the thermal actuation for initial movement and low power consumption of the electrostatic actuation for holding the switch in position in ON state. The switch with an initial switch gap of 7 µm has an electrothermal actuation voltage of 7 V and an electrostatic holding voltage of 21 V. The switch achieves superior RF performances: the measured insertion loss is −0.73 dB at 6 GHz, whereas the isolation is −46 dB at 6 GHz. In addition, the switch shows high reliability and power handling capability: the switch can operate up to 10 million cycles without failure with 1 W power applied to its signal line.
Publisher: IOP Publishing
Date: 17-01-2008
Publisher: Springer Science and Business Media LLC
Date: 13-02-2017
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 12-2018
Publisher: Springer Science and Business Media LLC
Date: 20-02-2020
Publisher: IEEE
Date: 12-2017
Publisher: IEEE
Date: 11-2010
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 09-2016
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 06-2016
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 07-2017
Location: United Kingdom of Great Britain and Northern Ireland
Start Date: 2013
End Date: 2015
Funder: Griffith University
View Funded ActivityStart Date: 2019
End Date: 2019
Funder: Australian Research Council
View Funded ActivityStart Date: 09-2022
End Date: 09-2025
Amount: $585,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 10-2022
End Date: 10-2024
Amount: $580,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 04-2019
End Date: 04-2020
Amount: $438,783.00
Funder: Australian Research Council
View Funded ActivityStart Date: 10-2021
End Date: 10-2023
Amount: $183,437.00
Funder: Australian Research Council
View Funded Activity