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Hydrogen-Induced Microstructure, Texture And Mechanical Property Evolutions In A High-Pressure Torsion Processed Zirconium Alloy, Zhiyang Wang, Ulf Garbe, Huijun Li, Andrew J. Studer, Robert P. Harrison, Mark D. Callaghan, Yanbo Wang, Xiaozhou Liao Jan 2012

Hydrogen-Induced Microstructure, Texture And Mechanical Property Evolutions In A High-Pressure Torsion Processed Zirconium Alloy, Zhiyang Wang, Ulf Garbe, Huijun Li, Andrew J. Studer, Robert P. Harrison, Mark D. Callaghan, Yanbo Wang, Xiaozhou Liao

Faculty of Engineering - Papers (Archive)

The gaseous hydriding-induced evolutions of the microstructure, texture and mechanical properties of Zircaloy-4 processed by high-pressure torsion (HPT) were assessed. Much δ-ZrH1.66 precipitation at 15 atm (21%) incurred significant hardening of vacuum-annealed HPT samples, and pure ε-ZrH2 obtained at 20 atm showed a superior microhardness of 470 HV0.3 and a low fracture toughness of 0.63 MPa m1/2. The δ-hydrides presented strong (1 1 1) texture and followed the (0 0 0 1)α-Zr//{1 1 1}δ-ZrH1.66 orientation relationship with the α-Zr matrix. During hydriding, α-Zr recrystallization texture was developed from ...


Understanding The Behavior Of Advanced High-Strength Steels Using Atom Probe Tomography, E V. Pereloma, Hossein Beladi, Laichang Zhang, Ilana Timokhina Jan 2012

Understanding The Behavior Of Advanced High-Strength Steels Using Atom Probe Tomography, E V. Pereloma, Hossein Beladi, Laichang Zhang, Ilana Timokhina

Faculty of Engineering - Papers (Archive)

The key evidence for understanding the mechanical behavior of advanced high strength steels was provided by atom probe tomography (APT). Chemical overstabilization of retained austenite (RA) leading to the limited transformation-induced plasticity (TRIP) effect was deemed to be the main factor responsible for the low ductility of nanostructured bainitic steel. Appearance of the yield point on the stress-strain curve of prestrained and bake-hardened transformation-induced plasticity steel is due to the unlocking from weak carbon atmospheres of newly formed during prestraining dislocations.


Self-Shape Optimisation Application: Optimisation Of Cold-Formed Steel Columns, Benoit P. Gilbert, Timothee J-M Savoyat, Lip H. Teh Jan 2012

Self-Shape Optimisation Application: Optimisation Of Cold-Formed Steel Columns, Benoit P. Gilbert, Timothee J-M Savoyat, Lip H. Teh

Faculty of Engineering - Papers (Archive)

This paper presents the optimisation of cold-formed steel open columns using the recently developed self-shape optimisation method that aims to discover new profile shapes. The strength of the coldformed steel sections is calculated using the Direct Strength Method, and the rules developed in the present work to automatically determine the local and distortional elastic buckling stresses from the Finite Strip and constrained Finite Strip Methods are discussed. The rules are verified against conventional and optimum sections yielded in this research, and found to accurately predict the elastic buckling stresses. The optimisation method is applied to singly-symmetric (mono-symmetric) cold-formed steel columns ...


Structural Control Of D-F Interaction In The Cefe1−Xruxaso System System, Cao Wang, Hao Jiang, Yongkang Luo, Chunmu Feng, Wenxian Li, Zhu-An Xu, Guanghan Cao, Jung Ho Kim, S. X. Dou Jan 2012

Structural Control Of D-F Interaction In The Cefe1−Xruxaso System System, Cao Wang, Hao Jiang, Yongkang Luo, Chunmu Feng, Wenxian Li, Zhu-An Xu, Guanghan Cao, Jung Ho Kim, S. X. Dou

Faculty of Engineering - Papers (Archive)

The isovalent substitution effect of Ru in CeFe1−xRuxAsO (0 ≤ x ≤ 1) has been systematically studied by powder X-ray diffraction, electrical resistivity, magnetization, and specific heat measurements. The antiferromagnetic (AFM) ordering of both d and 4f electrons are suppressed upon Ru doping, followed by Pauli paramagnetism (d electrons) and local moment paramagnetism (4f electrons) with strong ferromagnetic fluctuation, respectively. Neither superconductivity above 2K nor pronounced Kondo screening are observed in the substitution phase diagram. Combined with published results of the cerium-based quaternary compounds CeMXO(M =Fe, Ru; X =P, As), our data suggest that the end member CeRuAsO is on ...


Terahertz Magnetic Field Induced Coherent Spin Precession In Yfeo3, Runze Zhou, Zuanming Jin, Gaofang Li, Guohong Ma, Zhenxiang Cheng, Xiaolin Wang Jan 2012

Terahertz Magnetic Field Induced Coherent Spin Precession In Yfeo3, Runze Zhou, Zuanming Jin, Gaofang Li, Guohong Ma, Zhenxiang Cheng, Xiaolin Wang

Faculty of Engineering - Papers (Archive)

We present the magnetic dipole transition at 0.299 THz excited by magnetic component of terahertz electromagnetic pulse in an antiferromagnetic YFeO3 crystal. The impulsive magnetic field of the terahertz pulse tilts the macroscopic magnetization, causing deviation from the equilibrium position, which is manifested by a sharp absorption at the frequency of the quasiferromagnetic mode of the crystal. The rotating coherent macroscopic magnetization radiates elliptically polarized emission at the frequency of the quasiferromagnetic resonance due to the dichroic absorption in the crystal.


Deformation And Degradation Of Clay Fouled Ballast Subjected To Monotonic Loading, Nayoma Tennakoon, Buddhima Indraratna, Sanjay Nimbalkar, Cholachat Rujikiatkamjorn Jan 2012

Deformation And Degradation Of Clay Fouled Ballast Subjected To Monotonic Loading, Nayoma Tennakoon, Buddhima Indraratna, Sanjay Nimbalkar, Cholachat Rujikiatkamjorn

Faculty of Engineering - Papers (Archive)

Railways offer an efficient and economic transport mode in many countries including Australia, China and USA. Conventionally, rail tracks are positioned on ballast due to several potential benefits, including economy (availability and abundance), rapid drainage and high load bearing capacity. However, the ballast becomes contaminated due to intrusion of pumped subgrade material (e.g. clay and silt). This is one of the primary reasons for rapid track deterioration. In severe circumstances, fouled ballast needs to be cleaned or replaced to maintain the desired track resiliency, load bearing capacity and the track alignment, all of which influence the level of safety ...


Asymmetric Cryorolling For Fabrication Of Nanostructural Aluminum Sheets, Hailiang Yu, Cheng Lu, K. Tieu, Xianghua Liu, Yong Sun, Qingbo Yu, Charlie Kong Jan 2012

Asymmetric Cryorolling For Fabrication Of Nanostructural Aluminum Sheets, Hailiang Yu, Cheng Lu, K. Tieu, Xianghua Liu, Yong Sun, Qingbo Yu, Charlie Kong

Faculty of Engineering - Papers (Archive)

Nanostructural Al 1050 sheets were produced using a novel method of asymmetric cryorolling under ratios of upper and down rolling velocities (RUDV) of 1.1, 1.2, 1.3, and 1.4. Sheets were rolled to about 0.17 mm from 1.5 mm. Both the strength and ductility of Al 1050 sheets increase with RUDVs. Tensile strength of Al sheets with the RUDV 1.4 is larger 22.3% of that for RUDV 1.1, which is 196 MPa. The TEM observations show the grain size is 360 nm when the RUDV is 1.1, and 211 nm for ...


Aircraft Maintenance Planning And Scheduling: An Integrated Framework, Premaratne Samaranayake, Senevi Kiridena Jan 2012

Aircraft Maintenance Planning And Scheduling: An Integrated Framework, Premaratne Samaranayake, Senevi Kiridena

Faculty of Engineering - Papers (Archive)

Purpose – The purpose of this paper is to examine how certain limitations of the current approaches to planning and scheduling of aircraft heavy maintenance can be addressed using a single integrated framework supported by unified data structures. Design/methodology/approach – The “unitary structuring technique”, originally developed within the context of manufacturing planning and control, is further enhanced for aircraft heavy maintenance applications, taking into account the uncertainty associated with condition-based maintenance. The proposed framework delivers the advanced functionalities required for simultaneous and dynamic forward planning of maintenance operations, as well as finite loading of resources, towards optimising the overall maintenance ...


Dynamics Of Flux-Line Bundles And Voltage-Current Characteristics In A Ba(K)Fe2as2 Single Crystal, K H. Muller, S K. H Lam, Xiaolin Wang, S X. Dou Jan 2012

Dynamics Of Flux-Line Bundles And Voltage-Current Characteristics In A Ba(K)Fe2as2 Single Crystal, K H. Muller, S K. H Lam, Xiaolin Wang, S X. Dou

Faculty of Engineering - Papers (Archive)

Understanding the flux-line dynamics in layered superconductors is of utmost importance for many superconductor applications, yet extracting from measurements the relevant parameters remains a major challenge. Here we report on measurements and theoretical model calculations of voltage-current (V-I) characteristics of a superconducting Ba0.72K0.28Fe2As2 single crystal slightly below its transition temperature in perpendicular magnetic fields between 0.01 and 7 T. We propose a model that describes the flux-line dynamics above, as well as below, the depinning current. The model fits the experimental V-I characteristics remarkably well and is used to extract from the data the field dependence of ...


Application Of Main Flow Data In The Determination Of Boundary Shear Stress In Smooth Closed Ducts, Yu Han, Shu-Qing Yang, Nadeesha Dharmasiri Jan 2012

Application Of Main Flow Data In The Determination Of Boundary Shear Stress In Smooth Closed Ducts, Yu Han, Shu-Qing Yang, Nadeesha Dharmasiri

Faculty of Engineering - Papers (Archive)

Boundary shear stress plays an important role in momentum and mass transfers, but it is very difficult to determine experimentally. This paper develops a new method which can evaluate the boundary shear stress using the main flow data based on Momentum Balance Method (MBM). A theoretical relationship between the boundary shear stress and parameters of main flow region is established. The obtained results from MBM agree well with other methods, indicating that the new method is reasonable and reliable. The significant contribution of MBM is that the local boundary shear stress accurately and quickly can be determined by application of ...


Ultra Fast Mas Solid-State Nmr Studies Of Protein-Protein Interactions In The Bacterial Replisome, M Felletti, S Jehle, Y Wang, Kiyoshi Ozawa, S Jergic, G Otting, L Emsley, A Lesage, N Dixon, G Pintacuda Jan 2012

Ultra Fast Mas Solid-State Nmr Studies Of Protein-Protein Interactions In The Bacterial Replisome, M Felletti, S Jehle, Y Wang, Kiyoshi Ozawa, S Jergic, G Otting, L Emsley, A Lesage, N Dixon, G Pintacuda

Faculty of Engineering - Papers (Archive)

Replication of genomic DNA in bacteria involves multiple stable and transient interactions among protein subunits constituting the replisome. Here we show how ultra-fast magic angle spinning (MAS) solid-state NMR (ssNMR) and 1H-detection on either deutereted or fully protonated samples, can give new information about protein-protein interactions in the E. coli replisome. We focused on two fundamental interactions: the first one between the C-terminal domain of the single-stranded (ss) DNA binding protein and its own DNA-binding site, and the second one between the DNA polymerase III subunits a and s. SSB (a tetramer of 79 kDa) has a structurally well-defined ssDNA ...


Investigation On Temperature Change Of Cold Magnesium Alloy Strips Rolling Process With Heated Roll, Hailiang Yu, Qing-Bo Yu, Jin-Wu Kang, Xiang-Hua Liu Jan 2012

Investigation On Temperature Change Of Cold Magnesium Alloy Strips Rolling Process With Heated Roll, Hailiang Yu, Qing-Bo Yu, Jin-Wu Kang, Xiang-Hua Liu

Faculty of Engineering - Papers (Archive)

Magnesium alloy strips are widely used in aerospace, automotive industry, etc., which are difficult to produce through cold forming process due to their poor deformation ability. In this article, we studied whether the rolling process with heated roll could be used to roll cold magnesium alloy strips. Thermal-mechanical finite element simulation of the rolling process, using heated roll and cold strips to produce the magnesium alloy strips, was carried out. Influences of roll temperature, rolling velocity, rolling reduction ratio, and initial strip thickness on the thermal field and the mean temperature of magnesium alloy strips were analyzed. Both the heated ...


Facile Synthesis Of Graphene-Molybdenum Dioxide And Its Lithium Storage Properties, Kuok Hau Seng, Guo Dong Du, Li Li, Zhixin Chen, Hua-Kun Liu, Zaiping Guo Jan 2012

Facile Synthesis Of Graphene-Molybdenum Dioxide And Its Lithium Storage Properties, Kuok Hau Seng, Guo Dong Du, Li Li, Zhixin Chen, Hua-Kun Liu, Zaiping Guo

Faculty of Engineering - Papers (Archive)

Graphene–molybdenum dioxide composites in several ratios have been prepared through a facile synthesis method. Depending on the ratio, the as synthesized composites have either 2-dimensional graphene sheets with MoO2 particles anchored to them or a clustered agglomerate morphology. The composites have been characterised using Raman spectroscopy, X-ray diffraction, and electron diffraction to confirm the monoclinic MoO2 phase that is present. Lithium storage properties of the as-synthesised samples were tested in a coin-type half cell assembly to determine the relationship between the ratio and the electrochemical performance. The sample with highest amount of MoO2 (78 wt%) displayed the most promising ...


Electrochemical Characteristics Of Layered Li1.95mn0.9co0.15o3 (C2/M) As A Lithium-Battery Cathode, Kiyoshi Ozawa, Yasuhiro Nakao, Takashi Mochiku, Zhenxiang Cheng, Lianzhou Wang, Hideo Iwai, Yoshinori Tsuchiya, Hiroki Fujii, Naoki Igawa Jan 2012

Electrochemical Characteristics Of Layered Li1.95mn0.9co0.15o3 (C2/M) As A Lithium-Battery Cathode, Kiyoshi Ozawa, Yasuhiro Nakao, Takashi Mochiku, Zhenxiang Cheng, Lianzhou Wang, Hideo Iwai, Yoshinori Tsuchiya, Hiroki Fujii, Naoki Igawa

Faculty of Engineering - Papers (Archive)

A manganese-based solid solution with the composition of Li(1.95)Mn(0.9)Co(0.15)O(3) was synthesized by a simplified coprecipitation method, followed by a combustion technique, and its electrochemical characteristics as a lithium-battery cathode were investigated. Rietveld refinement based on neutron diffraction data revealed that the material is assigned to an Li(2)MnO(3)-type structure model with a monoclinic cell due to the space group symmetry of C2/m. In cycling of the Li/Li(+)/Li(1.95)Mn(0.9)Co(0.15)O(3) cell in the potential range of 2 ...


Experimental Realization Of Superconducting Quantum Interference Devices With Topological Insulator Junctions, M Veldhorst, C G. Molenaar, Xiaolin Wang, H Hilgenkamp, A Brinkman Jan 2012

Experimental Realization Of Superconducting Quantum Interference Devices With Topological Insulator Junctions, M Veldhorst, C G. Molenaar, Xiaolin Wang, H Hilgenkamp, A Brinkman

Faculty of Engineering - Papers (Archive)

We demonstrate topological insulator (Bi2Te3) dc SQUIDs, based on superconducting Nb leads coupled to nano-fabricated Nb-Bi2Te3-Nb Josephson junctions. The high reproducibility and controllability of the fabrication process allow the creation of dc SQUIDs with parameters that are in agreement with design values. Clear critical current modulation of both the junctions and the SQUID with applied magnetic fields have been observed. We show that the SQUIDs have a periodicity in the voltage-flux characteristic of U0 of relevance to the ongoing pursuit of realizing interferometers for the detection of Majorana fermions in superconductor—topological insulator structures.


Facile Synthesis Of A Interleaved Expanded Graphite-Embedded Sulphur Nanocomposite As Cathode Of Li-S Batteries With Excellent Lithium Storage Performance, Yun-Xiao Wang, Ling Huang, Li-Chao Sun, Su-Yuan Xie, Gui-Liang Xu, Shu-Ru Chen, Yue-Feng Xu, Jun-Tiao Li, Shulei Chou, S. X. Dou, Shi-Gang Sun Jan 2012

Facile Synthesis Of A Interleaved Expanded Graphite-Embedded Sulphur Nanocomposite As Cathode Of Li-S Batteries With Excellent Lithium Storage Performance, Yun-Xiao Wang, Ling Huang, Li-Chao Sun, Su-Yuan Xie, Gui-Liang Xu, Shu-Ru Chen, Yue-Feng Xu, Jun-Tiao Li, Shulei Chou, S. X. Dou, Shi-Gang Sun

Faculty of Engineering - Papers (Archive)

This paper reports the facile synthesis of a unique interleaved expanded graphite-embedded sulphur nanocomposite (S-EG) by melt-diffusion strategy. The SEM images of the S-EG materials indicate the nanocomposites consist of nanosheets with a layer-by-layer structure. Electrochemical tests reveal that the nanocomposite with a sulphur content of 60% (0.6S-EG) can deliver the highest discharge capacity of 1210.4 mAh g−1 at a charge–discharge rate of 280 mA g−1 in the first cycle, the discharge capacity of the 0.6S-EG remains as high as 957.9 mAh g−1 after 50 cycles of charge–discharge. Furthermore, at a ...


Electron Contamination Modeling And Skin Dose In 6 Mv Longitudinal Field Mrigrt: Impact Of The Mri And Mri Fringe Field, Bradley Oborn, Peter E. Metcalfe, Martin Butson, Anatoly B. Rosenfeld, P J. Keall Jan 2012

Electron Contamination Modeling And Skin Dose In 6 Mv Longitudinal Field Mrigrt: Impact Of The Mri And Mri Fringe Field, Bradley Oborn, Peter E. Metcalfe, Martin Butson, Anatoly B. Rosenfeld, P J. Keall

Faculty of Engineering - Papers (Archive)

PURPOSE: In recent times, longitudinal field MRI-linac systems have been proposed for 6 MV MRI-guided radiotherapy (MRIgRT). The magnetic field is parallel with the beam axis and so will alter the transport properties of any electron contamination particles. The purpose of this work is to provide a first investigation into the potential effects of the MR and fringe magnetic fields on the electron contamination as it is transported toward a phantom, in turn, providing an estimate of the expected patient skin dose changes in such a modality. METHODS: Geant4 Monte Carlo simulations of a water phantom exposed to a 6 ...


Enhanced Electrochemical Properties Of Lifepo4 By Mo-Substitution And Graphitic Carbon-Coating Via A Facile And Fast Microwave-Assisted Solid-State Reaction, Dan Li, Yudai Huang, Neeraj Sharma, Zhixin Chen, Dianzeng Jia, Zaiping Guo Jan 2012

Enhanced Electrochemical Properties Of Lifepo4 By Mo-Substitution And Graphitic Carbon-Coating Via A Facile And Fast Microwave-Assisted Solid-State Reaction, Dan Li, Yudai Huang, Neeraj Sharma, Zhixin Chen, Dianzeng Jia, Zaiping Guo

Faculty of Engineering - Papers (Archive)

A composite cathode material for lithium ion battery applications, Mo-doped LiFePO4/C, is obtained through a facile and fast microwave-assisted synthesis method. Rietveld analysis of LiFePO4-based structural models using synchrotron X-ray diffraction data shows that Mo-ions substitute onto the Fe sites and displace Fe-ions to the Li sites. Supervalent Mo6+ doping can act to introduce Li ion vacancies due to the charge compensation effect and therefore facilitate lithium ion diffusion during charging/discharging. Transmission electron microscope images demonstrate that the pure and doped LiFePO4 nanoparticles were uniformly covered by an approximately 5 nm thin layer of graphitic carbon. Amorphous carbon ...


Why Do We Need New Inclusion Experimental Techniques?, Neslihan Dogan, Brian J. Monaghan, Raymond J. Longbottom, Mark H. Reid, Xenophon C. Tsekouras Jan 2012

Why Do We Need New Inclusion Experimental Techniques?, Neslihan Dogan, Brian J. Monaghan, Raymond J. Longbottom, Mark H. Reid, Xenophon C. Tsekouras

Faculty of Engineering - Papers (Archive)

There is an ever increasing demand for cleaner steels, that is, those with low oxide inclusion content. This demand has highlighted the limitations of our current knowledge in controlling and predicting inclusion development during liquid steel processing.1) The formation of inclusions during liquid steel refining is an unavoidable consequence of the current industrial steelmaking process. Steel leaving a steelmaking converter contains anything from 400-1000 ppm of oxygen in solution [O].2) The [O] concentration needs to be reduced to less than 30 ppm to be cast. If not, it will react on solidification producing gas and condensed oxides. If ...


Application Of Centroidal Voronoi Diagram In Numerical Model Of Microforming Process, Hai Na Lu, Dong Bin Wei, Zheng Yi Jiang Jan 2012

Application Of Centroidal Voronoi Diagram In Numerical Model Of Microforming Process, Hai Na Lu, Dong Bin Wei, Zheng Yi Jiang

Faculty of Engineering - Papers (Archive)

Grain size, shape and orientation play an important role on the deformability of micro workpiece as the geometrical dimensions approach to a characteristic scale in micro-forming process. This paper addresses the three-dimensional (3D) finite element (FE) model with weighed centroidal voronoi diagram (WCVD). Steady-state grains are generated when the voronoi generating points approach the grain centroid utilising a simplex integration algorithm. As a result of the centroidal process, the topological features of grains advance the uniform and steady state gradually, which may cause a decrease of interfacial energy. The grain size distribution is compared between the 3D domain and random ...


"Oxygen-Vacancy Effect On Structural, Magnetic, And Ferroelectric Properties In Multiferroic Ymno3 Single Crystals", Dapeng Chen, Yi Du, Xiaolin Wang, Zhenxiang Cheng, S. X. Dou, Zhi W. Lin, Jian G. Zhu, Bo Xu Jan 2012

"Oxygen-Vacancy Effect On Structural, Magnetic, And Ferroelectric Properties In Multiferroic Ymno3 Single Crystals", Dapeng Chen, Yi Du, Xiaolin Wang, Zhenxiang Cheng, S. X. Dou, Zhi W. Lin, Jian G. Zhu, Bo Xu

Faculty of Engineering - Papers (Archive)

"We have investigated the structural, magnetic, and ferroelectric properties of magnetically frustrated multiferroic YMnO3 single crystals. The ferroelectric domain structures of YMnO3 samples were studied by piezoresponse force microscopy. Instead of domain vortex structure in stoichiometric crystals, YMnO3-delta exhibits a random domain configuration with straight domain walls. In magnetic measurements, the YMnO3-delta crystal shows typical antiferromagnetic behavior with higher Neel temperature and lower magnetization compared to the stoichiometric sample. The ordered oxygen vacancies dominate multiferroicity through tailoring the domain wall structure. (C) 2012 American Institute of Physics. [doi:10.1063/1.3676000]"


Evolutionary Algorithm For Water Storage Forecasting Response To Climate Change With Small Data Sets: The Wolonghu Wetland, China, Qingwei Ni, Li Wang, Binghui Zheng, Muttucumaru Sivakumar Jan 2012

Evolutionary Algorithm For Water Storage Forecasting Response To Climate Change With Small Data Sets: The Wolonghu Wetland, China, Qingwei Ni, Li Wang, Binghui Zheng, Muttucumaru Sivakumar

Faculty of Engineering - Papers (Archive)

"A novel genetic programming (GP) technique, a new method of evolutionary algorithms, was applied to a small data set to predict the water storage of Wolonghu wetland in response to the climate change in the northeastern part of China. Fourteen years (1993-2006) of annual water storage and climatic data of the wetland were used for model training and testing. Results of simulations and predictions illustrate a good fit between calculated water storage and observed values (mean absolute percent error = 9.47, r = 0.99). By comparison, a multilayer perceptron method (a popular artificial neural network model) and Grey theory model ...


A "Skeleton/Skin"Strategy For Preparing Ultrathin Free-Standing Single-Walled Carbon Nanotube/Polyaniline Films For High Performance Supercapacitor Electrodes, Zhiqiang Niu, Pingshan Luan, Qi Shao, Haibo Dong, Jinzhu Li, Jun Chen, Duan Zhao, Le Cai, Weiya Zhou, Xiaodong Chen, Sishen Xie Jan 2012

A "Skeleton/Skin"Strategy For Preparing Ultrathin Free-Standing Single-Walled Carbon Nanotube/Polyaniline Films For High Performance Supercapacitor Electrodes, Zhiqiang Niu, Pingshan Luan, Qi Shao, Haibo Dong, Jinzhu Li, Jun Chen, Duan Zhao, Le Cai, Weiya Zhou, Xiaodong Chen, Sishen Xie

Faculty of Engineering - Papers (Archive)

One of the most critical aspects in the preparation of single-walled carbon nanotubes (SWCNTs)/ conducting polymer hybrid electrodes is to improve the energy density without seriously deteriorating their high power capability. Here, we report a ‘‘skeleton/skin’’ strategy for the preparation of freestanding, thin and flexible SWCNT/polyaniline (PANI) hybrid films by a simple in situ electrochemical polymerization method using directly grown SWCNT films with a continuous reticulate structure as template. In situ electrochemical polymerization can achieve effective deposition of PANI onto the surface of SWCNT bundles in the films and control the morphology and microstructure of the SWCNT/PANI ...


N-Nitrosamine Removal By Reverse Osmosis For Indirect Potable Water Reuse – A Critical Review Based On Observations From Laboratory, Pilot And Full-Scale Studies, Takahiro Fujioka, Stuart J. Khan, Yvan Poussade, Jorg E. Drewes, Long D. Nghiem Jan 2012

N-Nitrosamine Removal By Reverse Osmosis For Indirect Potable Water Reuse – A Critical Review Based On Observations From Laboratory, Pilot And Full-Scale Studies, Takahiro Fujioka, Stuart J. Khan, Yvan Poussade, Jorg E. Drewes, Long D. Nghiem

Faculty of Engineering - Papers (Archive)

N-nitrosodimethylamine (NDMA) and several other N-nitrosamines have been identified as probable human carcinogens. Here, we review key aspects related to the occurrence and removal of N-nitrosamines by reverse osmosis (RO) membranes in the context of indirect potable water reuse. A comprehensive analysis of the existing data reveals significant variations in the rejection of NDMA by RO membranes reported in the literature, ranging from negligible up to 86%. This review article provides some insight into the reasons for such variations by examining the available data on the effects of operating conditions on NDMA rejection. Amongst several operating parameters investigated so far ...


Ultrafast Dynamics Of The Mn3+ D-D Transition And Spin-Lattice Interaction In Ymno3 Film, Z Jin, Hong Ma, Gaofang Li, Y Xu, G Ma, Zhenxiang Cheng Jan 2012

Ultrafast Dynamics Of The Mn3+ D-D Transition And Spin-Lattice Interaction In Ymno3 Film, Z Jin, Hong Ma, Gaofang Li, Y Xu, G Ma, Zhenxiang Cheng

Faculty of Engineering - Papers (Archive)

"We investigate the photo-induced carrier dynamics and spin-lattice interaction in hexagonal YMnO(3) film by the temperature-dependent femtosecond pump-probe spectroscopy. The spin-lattice interaction is identified from the slow component of the transient transmittance change with the excitation energies tuned to 1.7 eV and 2.0 eV, which are close to Mn(3+) ions d((xz),(yz)) d((z2)) and d((x2-y2),(xy)) d((z2)) transition, respectively. Temperature dependences of the spin-lattice relaxation parameters demonstrate that the spin-lattice interaction is strongly connected with the d-d transition within Mn(3+) ions and enhanced by spin ordering. (C) 2012 American Institute of ...


A New Method Of Filtration Design On Rail Track Subballast, Laricar Dominic. O Trani, Buddhima Indraratna Jan 2012

A New Method Of Filtration Design On Rail Track Subballast, Laricar Dominic. O Trani, Buddhima Indraratna

Faculty of Engineering - Papers (Archive)

Apart from being a protection layer against subgrade attrition, the subballast of ballasted rail tracks is designed mainly to act as a stress dissipation layer or more commonly known as a capping layer. When considered as a filtration layer, subballast would prove to be inadequate due to the use of design criteria that are primarily based on steady seepage loading common in embankment dams. The seepage hydraulics through porous media would have to be influenced by the cyclic mechanical loading generated by the passing trains. Under the influence of cyclic train loading, subballast particles rearrange and attempt to attain a ...


Automated Offline Programming For Robotic Welding System With High Degree Of Freedoms, Zengxi Pan, Joseph Polden, Nathan P. Larkin, Stephen Van Duin, John Norrish Jan 2012

Automated Offline Programming For Robotic Welding System With High Degree Of Freedoms, Zengxi Pan, Joseph Polden, Nathan P. Larkin, Stephen Van Duin, John Norrish

Faculty of Engineering - Papers (Archive)

Although robotics based flexible automation is an intriguing prospect for small to median enterprises in the era of the global competition, the complexity of programming remains one of the major hurdles limiting its applications. This paper presents an automated offline programming (AOLP) method to address this issue. AOLP is software that automatically plans and programs for a robotic welding system with high Degree of Freedoms (DOFs). It takes CAD model as input, and is able to generate the complete robotic welding code without any further programming effort.


Carbon Nanotube Nanoweb-Bioelectrode For Highly Selective Dopamine Sensing, Jie Zhao, Weimin Zhang, Peter Sherrell, Joselito M. Razal, Xu-Feng Huang, Andrew I. Minett, Jun Chen Jan 2012

Carbon Nanotube Nanoweb-Bioelectrode For Highly Selective Dopamine Sensing, Jie Zhao, Weimin Zhang, Peter Sherrell, Joselito M. Razal, Xu-Feng Huang, Andrew I. Minett, Jun Chen

Faculty of Engineering - Papers (Archive)

A highly sensitive and selective dopamine sensor was fabricated with the unique 3D carbon nanotube nanoweb (CNT-N) electrode. The as-synthesised CNT-N was modified by oxygen plasma to graft functional groups in order to increase selective electroactive sites at the CNT sidewalls. This electrode was characterized physically and electrochemically using HRSEM, Raman, FT-IR, and cyclic voltammetry (CV). Our investigations indicated that the O2-plasma treated CNT-N electrode could serve as a highly sensitive biosensor for the selective sensing of dopamine (DA, 1 μM to 20 μM) in the presence of ascorbic acid (AA, 1000 μM).


Carbon Nanotube/Graphene Nanocomposite As Efficient Counter Electrodes In Dye-Sensitized Solar Cells, Josef Velten, Attila J. Mozer, Dan Li, David Officer, G G. Wallace, Ray Baughman, A Zakhidov Jan 2012

Carbon Nanotube/Graphene Nanocomposite As Efficient Counter Electrodes In Dye-Sensitized Solar Cells, Josef Velten, Attila J. Mozer, Dan Li, David Officer, G G. Wallace, Ray Baughman, A Zakhidov

Faculty of Engineering - Papers (Archive)

We demonstrated the replacement of the Pt catalyst normally used in the counter electrode of a dye-sensitized solar cell (DSSC) by a nanocomposite of dry spun carbon multi-walled nanotube (MWNT) sheets with graphene flakes (Gr-F). The effectiveness of this counter electrode on the reduction of the triiodide in the iodide/triiodide redox (I−/I− 3 ) redox reaction was studied in parallel with the use of the dry spun carbon MWNT sheets alone and graphene flakes used independent of each other. This nanocomposite deposited onto fluorinated tin-oxide-coated glass showed improved catalytic behavior and power conversion efficiency (7.55%) beyond the use ...


Absolute Cross Sections For Elastic Electron Scattering From Methylformamide, J B. Maljkovic, F Blanco, G Garcia, B P. Marinkovic, A R. Milosavljevic Jan 2012

Absolute Cross Sections For Elastic Electron Scattering From Methylformamide, J B. Maljkovic, F Blanco, G Garcia, B P. Marinkovic, A R. Milosavljevic

Faculty of Engineering - Papers (Archive)

Elastic electron scattering from gaseous methylformamide (N-methylformamide, C2H5NO) has been investigated. Absolute elastic differential cross sections (DCSs) were determined both experimentally and theoretically for the incident energies from 50 to 300 eV. The measurements were performed using a cross-beam technique, for scattering angles from 20◦ to 110◦. Relative elastic DCSs were measured as a function of both the angle and the incident energy and the absolute DCSs were determined using the relative flow method. The calculations of electron interaction cross sections are based on a corrected form of the independent-atom method, known as the SCAR ...