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Articles 151 - 163 of 163
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Electrochemic Properties Of Single-Wall Carbon Nanotube Electrodes, J. N. Barisci, G G. Wallace, D. Chattopadhyay, F. Papadimitrakopoulos, R. H. Baughman
Electrochemic Properties Of Single-Wall Carbon Nanotube Electrodes, J. N. Barisci, G G. Wallace, D. Chattopadhyay, F. Papadimitrakopoulos, R. H. Baughman
Faculty of Engineering - Papers (Archive)
The electrochemical properties of single-wall carbon nanotube ~CNT! electrodes in the form of sheets or papers have been examined. Thermal annealing has produced significant changes in a range of properties of the material including increased hydrophobicity and elimination of electroactive surface functional groups and other impurities. As a result of these changes, the treated electrodes exhibit lower double-layer capacitance, absence of faradaic responses and associated pseudocapacitance, and a better frequency response. The basic electrochemical behavior of the CNT paper electrodes is not markedly affected by relatively large differences in electrolyte ion size, consistent with an average pore size of 9 …
A Simple Means To Immobilize Enzyme Into Conducting Polymers Via Entrapment, Jun Chen, B. Winther-Jensen, C. Lynam, O Ngamna, S. Moulton, W. Zhang, G G. Wallace
A Simple Means To Immobilize Enzyme Into Conducting Polymers Via Entrapment, Jun Chen, B. Winther-Jensen, C. Lynam, O Ngamna, S. Moulton, W. Zhang, G G. Wallace
Faculty of Engineering - Papers (Archive)
No abstract provided.
Synthesis Of Chiral Polyaniline Films Via Chemical Vapor Phase Polymerization, J. Chen, B. Winther-Jensen, Y. Pornputtkul, K. West, L. Kane-Macguire, Gordon G. Wallace
Synthesis Of Chiral Polyaniline Films Via Chemical Vapor Phase Polymerization, J. Chen, B. Winther-Jensen, Y. Pornputtkul, K. West, L. Kane-Macguire, Gordon G. Wallace
Faculty of Engineering - Papers (Archive)
Electrically and optically active polyaniline films doped with (1R)-(-)-10-camphorsulfonic acid were successfully deposited on nonconductive substrates via chemical vapor phase polymerization. The above polyaniline∕R-camphorsulfonate films were characterized by electrochemical and physical methods, such as cyclic voltammetry (CV), UV-vis spectroscopy, four-point probe conductivity measurement, Raman spectroscopy, circular dichroism spectroscopy, and scanning electron microscopy. The poly aniline films grown by this method not only showed high electrochemical activity, supported by CV and Raman spectrum, but also exhibited optical activity corresponding to the polymer chains as observed by circular dichroism spectra.
Significant Improvement Of Activation Energy In Mgb2/Mg2si Multilayer Films, Y. Zhao, S X. Dou, M. Ionescu, P. Munroe
Significant Improvement Of Activation Energy In Mgb2/Mg2si Multilayer Films, Y. Zhao, S X. Dou, M. Ionescu, P. Munroe
Faculty of Engineering - Papers (Archive)
We obtained a MgB2/Mg2Si multilayer structure by sequentially switching a stoichiometric MgB2 target and a Si target during off-axis pulsed-laser deposition. The transmission-electron-microscopic cross-sectional image of the resulting film exhibits a layered structure with each MgB2 layer being 40–50 nm thick and the Mg2Si interlayers about 5 nm thick. A clearly enhanced anisotropy in the irreversibility lines and the vortex activation energy was observed. Pinning and the flux flow activation energy are significantly increased in parallel applied fields.
Quantum Effects In Small-Capacitance High Temperature Superconducting Tunneling Junctions, Gustavo A. Alvarez, I. Iguchi, Xiaolin Wang, S. X. Dou, Qiwen Yao
Quantum Effects In Small-Capacitance High Temperature Superconducting Tunneling Junctions, Gustavo A. Alvarez, I. Iguchi, Xiaolin Wang, S. X. Dou, Qiwen Yao
Faculty of Engineering - Papers (Archive)
We investigated the effects of single electron charging energy in high temperature superconductors. Various phenomena originating from Coulomb blockade were observable in superconducting tunnel junctions. High quality tunneling junctions were fabricated from c-axis oriented NdBa2Cu3O7–delta/PrBa2Cu3O7–delta/NdBa2Cu3O7–delta thin film multilayers by the pulsed laser deposition method. The current-voltage characteristics (CVCs) show a Coulomb gap for Cooper pair tunneling when the charging energy exceeds the Josephson coupling energy. We found a regime in which the CVCs exhibit sharply defined Coulomb steps due to single electron dynamics and nonlinear tunneling rates. From the obtained Coulomb staircase, the tunneling resistance shows a quantum effect: It …
Transport Properties Of Multilayered Mgb2/Mg2si Superconducting Thin Film, Y. Zhao, M. J. Qin, S X. Dou, M. Ionescu, P. Munroe
Transport Properties Of Multilayered Mgb2/Mg2si Superconducting Thin Film, Y. Zhao, M. J. Qin, S X. Dou, M. Ionescu, P. Munroe
Faculty of Engineering - Papers (Archive)
Electronic transport measurements have been carried out on superconducting MgB2/Mg2Si multilayer film, using a standard four-probe method in perpendicular and parallel applied fields. The film, which was prepared by pulsed-laser deposition, has a layered structure with each MgB2 layer being 40–50 nm thick and the Mg2Si interlayers about 5 nm thick. The flux flow activation energy is deduced from the resistivity-temperature curves using an Arrhenius fit. The results show a clearly enhanced anisotropy of the vortex activation energy in the multilayered film. The irreversibility field and the vortex activation energy are significantly increased in parallel fields.
Developments In Geotechnical And Geo-Environmental Research In Relation To Low-Lying Floodplain Improvement, With Special Reference To Acidic Soil Improvement, Buddhima Indraratna, A. Golab, Mohamed A. Shahin, Cholachat Rujikiatkamjorn
Developments In Geotechnical And Geo-Environmental Research In Relation To Low-Lying Floodplain Improvement, With Special Reference To Acidic Soil Improvement, Buddhima Indraratna, A. Golab, Mohamed A. Shahin, Cholachat Rujikiatkamjorn
Faculty of Engineering - Papers (Archive)
In many countries, the ever-growing demand for housing and tourism in coastal regions has forced the development of low-lying estuarine floodplains and wetlands for major infrastructure including highways, railways, hotels and high rise apartments, and commercial buildings. The estuarine clays, often with high organic content, are usually characterised by very high settlement upon loading affecting the stability of all forms of infrastructure. In addition, pyrites and other sulphidic compounds that exist at shallow depths in these soils can oxidise to form sulphuric acid presenting a challenging environmental issue, which if not controlled can cause catastrophic damage to coastal aquaculture and …
Predictions And Performances Of Prefabricated Vertical Drain Stabilised Soft Clay Foundations, Buddhima Indraratna, Cholachat Rujikiatkamjorn
Predictions And Performances Of Prefabricated Vertical Drain Stabilised Soft Clay Foundations, Buddhima Indraratna, Cholachat Rujikiatkamjorn
Faculty of Engineering - Papers (Archive)
In this paper, the analytical solution for radial consolidation of soft soils is proposed considering the impacts of the variation of volume compressibility and permeability. The Cavity Expansion Theory is employed to predict the smear zone caused by the installation of mandrel driven vertical drains in soft clay. The smear zone prediction is then compared to the data obtained from the large-scale radial consolidation tests. Furthermore, the advantages and limitations of vacuum application through vertical drains in the absence of high surcharge embankments are discussed using the proposed solutions. The applied vacuum pressure generates negative pore water pressure, resulting in …
Comparison Of Small-Field Behavior In Mgb2, Low- And High-Temperature Superconductors, Alexey Pan, S X. Dou
Comparison Of Small-Field Behavior In Mgb2, Low- And High-Temperature Superconductors, Alexey Pan, S X. Dou
Faculty of Engineering - Papers (Archive)
Different types of superconductors have been investigated at small magnetic fields (Ba) over wide temperature (T) ranges at different Ba orientations. It has been shown that the temperature dependence of the characteristic field (B*), separating the Ba-independent critical current density (Jc) plateau (single vortex pinning regime) and the region with Jc(Ba) (collective pinning), can be attributed either to the temperature dependence of the magnetic penetration depth for Nb-film and MgB2 bulk superconductors, or to thermally activated processes for Bi-based superconductors and YBa2Cu3O7−8 superconducting films. In both cases the vortex pinning influence appears to have a secondary role, affecting the effective …
An Evaluation Of Airborne Laser Scan Data For Coalmine Subsidence Mapping, D. R. Palamara, M. Nicholson, Phil Flentje, E. Baafi, G. Brassington
An Evaluation Of Airborne Laser Scan Data For Coalmine Subsidence Mapping, D. R. Palamara, M. Nicholson, Phil Flentje, E. Baafi, G. Brassington
Faculty of Engineering - Papers (Archive)
The accurate mapping of coalmine subsidence is necessary for the continued management of potential subsidence impacts. The use of airborne laser scan (ALS) data for subsidence mapping provides an alternative method to traditional ground-based approaches that affords increased accessibility and complete spatial coverage. This paper evaluates the suitability and potential of ALS data for subsidence mapping, primarily through the examination of two pre-mining surveys in a rugged, densely vegetated study site. Data quality, in terms of mean point spacing and coverage, is evaluated, along with the impact of interpolation methods, resolution, and terrain. It was assumed that minimal surface height …
Silicon Microdosimetry In Heterogeneous Materials: Simulation And Experiment, A. Wroe, Anatoly B. Rosenfeld, I. Cornelius, Dale A. Prokopovich, M. Reinhard, R. Schulte, V. Bashkirov
Silicon Microdosimetry In Heterogeneous Materials: Simulation And Experiment, A. Wroe, Anatoly B. Rosenfeld, I. Cornelius, Dale A. Prokopovich, M. Reinhard, R. Schulte, V. Bashkirov
Faculty of Engineering - Papers (Archive)
Microdosimetry spectra obtained experimentally utilizing a Silicon-On-Insulator (SOI) microdosimeter within biological materials, was used to provide information on secondary radiation spectra at tissue boundaries. Comparative GEANT4 simulations of the experimental conditions were also conducted.
Observational Approach For Urban Landslide Management, Phil Flentje, Robin N. Chowdhury
Observational Approach For Urban Landslide Management, Phil Flentje, Robin N. Chowdhury
Faculty of Engineering - Papers (Archive)
The occurrence of landslides in urban hillside areas poses significant challenges for risk management within residential suburbs as well as along road and railway lines. The main focus of this paper is the development of an “observational approach” for landslide risk management and its application within an important landslide study area, the Wollongong Local Government Area, in the state of New South Wales, Australia. Monitoring of subsurface shear movement and pore water pressures at a number of places in the study area during the last decade has already proved very useful in combination with rainfall data from a number of …
Enhancement Of In-Field Jc In Mgb2 /Fe Wire Using Single- And Multiwalled Carbon Nanotubes, J. H. Kim, W. K. Yeoh, M. J. Qin, X. Xu, S. X. Dou
Enhancement Of In-Field Jc In Mgb2 /Fe Wire Using Single- And Multiwalled Carbon Nanotubes, J. H. Kim, W. K. Yeoh, M. J. Qin, X. Xu, S. X. Dou
Faculty of Engineering - Papers (Archive)
The authors investigated the doping effects of single-walled carbon nanotubes (SWCNTs) and multi-walled carbon nanotubes (MWCNTs) on the Tc, lattice parameters, Jc(B), microstructure, and Hc2 of MgB2 /Fe wire. These effects systematically showed the following sequence for Tc and the α axis: the SWCNT doped wireMWshortCNT doped wireMWlongCNT doped wire wire, while Jc(B) followed the sequence of the SWCNT doped wire>the MWshortCNT doped wire>the MWlongCNT doped wire>undoped wire. A dominating mechanism behind all these findings is the level of C …