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Full-Text Articles in Engineering
Effect Of Manganese Content And Microstructure On The Susceptibility Of X70 Pipeline Steel To Hydrogen Cracking, D Hejazi, A J. Haq, N Yazdipour, D P. Dunne, A Calka, Frank J. Barbaro, E V. Pereloma
Effect Of Manganese Content And Microstructure On The Susceptibility Of X70 Pipeline Steel To Hydrogen Cracking, D Hejazi, A J. Haq, N Yazdipour, D P. Dunne, A Calka, Frank J. Barbaro, E V. Pereloma
Faculty of Engineering and Information Sciences - Papers: Part A
The influence of composition and microstructure on susceptibility to hydrogen induced cracking (HIC) was investigated in high strength pipeline steels, with Mn contents of 1.2% (standard, X70), and 0.5% (medium, MX70). The HIC resistance of the simulated coarse grained heat affected zone microstructures and normalized X70 transfer bar was also investigated. Notched and fatigue pre-cracked samples were charged with hydrogen prior to three point bend tests. The conditional fracture toughness JQ was determined. The results are discussed in relation to grain size, microstructure, composition and the type and distribution of non-metallic inclusions and precipitates.
Effect Of A Static Magnetic Field On Nanodosimetric Quantities In A Dna Volume, Peter Lazarakis, Marion U. Bug, Elisabetta Gargioni, Susanna Guatelli, Sabastien Incerti, Hans Rabus, Anatoly B. Rosenfeld
Effect Of A Static Magnetic Field On Nanodosimetric Quantities In A Dna Volume, Peter Lazarakis, Marion U. Bug, Elisabetta Gargioni, Susanna Guatelli, Sabastien Incerti, Hans Rabus, Anatoly B. Rosenfeld
Faculty of Engineering - Papers (Archive)
Abstract Purpose: With the advent of magnetic resonance imaging (MRI)-guided radiation therapy it is becoming increasingly important to consider the potential influence of a magnetic field on ionising radiation. This paper aims to study the effect of a magnetic field on the track structure of radiation to determine if the biological effectiveness may be altered. Methods: Using the Geant4-DNA (GEometry ANd Tracking 4) Monte Carlo simulation toolkit, nanodosimetric track structure parameters were calculated for electrons, protons and alpha particles moving in transverse magnetic fields up to 10 Tesla. Applying the model proposed by Garty et al., the track structure parameters …
Rietveld Analysis Of The Effect Of Annealing Atmosphere On Phase Evolution Of Nanocrystalline Tio 2 Powders, M Salari, M Rezaee, A T. Chidembo, Konstantin Konstantinov, Hua-Kun Liu
Rietveld Analysis Of The Effect Of Annealing Atmosphere On Phase Evolution Of Nanocrystalline Tio 2 Powders, M Salari, M Rezaee, A T. Chidembo, Konstantin Konstantinov, Hua-Kun Liu
Faculty of Engineering and Information Sciences - Papers: Part A
The struclUral evolution of nanocrystaUine Ti02 was studied by X-ray diffraction (XRD) and the Rietveld refinement method (RRM). Ti02 powders were prepared by the sol-gel technique. Post annealing of as·synthesized powders in the temperature range from 500°C to 600 °C under air and argon atmospheres led to the formation of Ti02 nanoparticles with mean crystallite size in the range of 37-165 nm. based on the Rietveld refinement results. It was found that the phase structure, composition, and crystallite size of the resulting particles were dependent on not only the annealing temperature, but also the annealing atmosphere. Rietveld refinement of the …
Magnetocapacitance Effect In Nonmultiferroic Yfe03 Single Crystal, Z X. Cheng, H Shen, J Xu, Peng Liu, S J. Zhang, Jianli Wang, Xiaolin Wang, S X. Dou
Magnetocapacitance Effect In Nonmultiferroic Yfe03 Single Crystal, Z X. Cheng, H Shen, J Xu, Peng Liu, S J. Zhang, Jianli Wang, Xiaolin Wang, S X. Dou
Australian Institute for Innovative Materials - Papers
YFeO3 single crystal displays two relaxor-like dielectric relaxations, one at low temperature (170300 K) and one at high temperature (370520 K), which are attributed to the activation of electrons and oxygen vacancies, respectively. Above the temperature at which electrons are activated, the sample displays a large magnetocapacitance effect. Comparison of the impedance Cole-Cole plots measured with and without applied magnetic field reveals that the occurrence of magnetocapacitance effect is accompanied with an increasing in DC conductivity under magnetic field after the activation of electrons, which is explained by the enhancement of electron jumping in Fe2b-O-Fe3b chains by magnetic field. Thus …
Abnormal Magnetic Behaviors And Large Magnetocaloric Effect In Mnps3 Nanoparticles, R Zeng, S Q. Wang, G D. Du, Jianli Wang, J C. Debnath, Precious Shamba, Z Y. Fang, S. X. Dou
Abnormal Magnetic Behaviors And Large Magnetocaloric Effect In Mnps3 Nanoparticles, R Zeng, S Q. Wang, G D. Du, Jianli Wang, J C. Debnath, Precious Shamba, Z Y. Fang, S. X. Dou
Faculty of Engineering - Papers (Archive)
A nanostructured honeycomb lattice consisting of MnPS3 nanoparticles synthesized via the ion-exchange technique was found to have restacked molecular layers stabilized by H2O insertion between the layers. Susceptibility (χ) and heat capacity measurements showed the absence of long range magnetic ordering, at least down to 2 K. However, the χ data showed that the system possesses a high effective Curie temperature, suggesting that the system is in a high spin lattice disordered state. Evaluation of the magnetocaloric effect indicates that the system has a large reversible magnetic-entropy change (−ΔSm) of 6.8 and 12.8 J/kg K …
Magnetovolume Effect In Ho2fe17-Xmnx Compounds, Jianli Wang, A J. Studer, S J. Kennedy, R Zeng, S. X. Dou, S J. Campbell
Magnetovolume Effect In Ho2fe17-Xmnx Compounds, Jianli Wang, A J. Studer, S J. Kennedy, R Zeng, S. X. Dou, S J. Campbell
Faculty of Engineering - Papers (Archive)
The structural and magnetic properties of seven compounds in the Ho2Fe17-xMnx series (x = 0-5) have been investigated. The spontaneous magnetization Ms at 10 K exhibits a minimum at x ≈ 3.8 while the 3d-sublattice magnetization MT is found to decrease at ∼ −3.4 μB/per Mn atom compared with the rate of ∼−2.0 μB/per Mn atom expected from a simple dilution model. All of the Ho2Fe17-xMnx compounds exhibit anisotropic thermal expansion below their Curie temperatures leading to the presence of strong magnetovolume …
The Effect Of Reduced Graphene Oxide Addition On The Superconductivity Of Mgb2, K S. B De Silva, S Gambhir, Xiaolin Wang, X Xu, W X. Li, David L. Officer, D Wexler, G G. Wallace, S. X. Dou
The Effect Of Reduced Graphene Oxide Addition On The Superconductivity Of Mgb2, K S. B De Silva, S Gambhir, Xiaolin Wang, X Xu, W X. Li, David L. Officer, D Wexler, G G. Wallace, S. X. Dou
Faculty of Engineering - Papers (Archive)
Reduced graphene oxide (rGO) and highly reduced chemically converted graphene (ICCO) samples were prepared under different processing condition! and were doped into MgBz by a diffusion process at 800 °C for 10 houn. It was demonstrated that a small addition rCCG can significantly improve the supcn;onducting properties of MgBz. Doping of M8B2 with 1 mol% of rCCG resulted in a Ie of 5.45 X lOS A cm-2 at 20 K in self-fields, which il nearly 32% improvement over that of the undopcd sample. This is a significant improvement as most carbon sources adversely affect the Ie performance: at the zero …
"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
"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]"
Semi-Analytical Solutions For Cubic Autocatalytic Reaction-Diffusion Equations; The Effect Of A Precursor Chemical, Muteb Alharthi, Timothy Marchant, Mark Nelson
Semi-Analytical Solutions For Cubic Autocatalytic Reaction-Diffusion Equations; The Effect Of A Precursor Chemical, Muteb Alharthi, Timothy Marchant, Mark Nelson
Faculty of Engineering and Information Sciences - Papers: Part A
Semi-analytical solutions for a cubic autocatalytic reaction, with linear decay and a precursor chemical, are considered. The model is coupled with diffusion and considered in a one-dimensional reactor. In this model the reactant is supplied by two mechanisms, diffusion via the cell boundaries and decay of an abundant precursor chemical present in the reactor. The Galerkin method is used to approximate the spatial structure of the reactant and autocatalyst concentrations in the reactor. Ordinary differential equations are then obtained as an approximation to the governing partial differential equations and analyzed to obtain semi-analytical results for the reaction-diffusion cell. Singularity theory …
Probing And Modelling The Localized Self-Mixing In A Gan/Algan Field-Effect Terahertz Detector, J D. Sun, H Qin, R A. Lewis, Y F. Sun, X Y. Zhang, Y Cai, D M. Wu, B S. Zhang
Probing And Modelling The Localized Self-Mixing In A Gan/Algan Field-Effect Terahertz Detector, J D. Sun, H Qin, R A. Lewis, Y F. Sun, X Y. Zhang, Y Cai, D M. Wu, B S. Zhang
Faculty of Engineering - Papers (Archive)
In our previous work, we inferred the existence of localized self-mixing in an antenna-coupled field-effect terahertz detector. In this Letter, we report a quasistatic self-mixing model taking into account the localized terahertz fields and its verification by comparing the simulated results with the experimental data in a two-dimensional space of the gate voltage and the drain/source bias. The model well describes the detector characteristics: not only the magnitude, but also the polarity, of the photocurrent can be tuned. The existence of strongly localized self-mixing in such detectors is confirmed.
Radial Consolidation Modelling Incorporating Downdrag Effect For A Multi-Layer Soil, Cholachat Rujikiatkamjorn, Buddhima Indraratna
Radial Consolidation Modelling Incorporating Downdrag Effect For A Multi-Layer Soil, Cholachat Rujikiatkamjorn, Buddhima Indraratna
Faculty of Engineering - Papers (Archive)
A system of vertical drains (PVDs) with preloading is a successful method for promoting horizontal drainage and accelerating soil consolidation. A piecewise technique is used to capture the radial consolidation in the multi-layer soil system to incorporate (a) the effect of soil downdrag and (b) smear zone where soil permeability varying linearly. The effect of soil dragged down from the upper soil layer into the lower layer has been analysed in terms of required time for consolidation. It can be seen that the consolidation of the multi layer soil depends on the interaction between 2 adjacent layer, penetration depth, and …
The Effect Of The Strain Rate On Soft Soil Behaviour Under Cyclic Loading, Jing Ni, Buddhima Indraratna, X Y. Geng, Cholachat Rujikiatkamjorn
The Effect Of The Strain Rate On Soft Soil Behaviour Under Cyclic Loading, Jing Ni, Buddhima Indraratna, X Y. Geng, Cholachat Rujikiatkamjorn
Faculty of Engineering - Papers (Archive)
In this paper, cyclic triaxial loading tests were conducted on specimens of soft clay with varying cyclic stresses and frequencies to investigate the performance of soft soil subgrade subjected to cyclic loading. The laboratory results indicate that given the same level of cyclic stress, the stability of clay subgrade is primarily dependent on the loading time with no consistent frequency/train speed effect. There exists a critical level of cyclic stress between 60 and 80% of the monotonic shear strength, above which failure may occur regardless of the loading frequency. The nature that soils behave dependently on cyclic stress level rather …
Effect Of Annealing On The Microstructure, Texture And Mechanical Properties Of Severely Deformed Interstitial Free Steel, Sujoy S. Hazra, Azdiar A. Gazder, E V. Pereloma
Effect Of Annealing On The Microstructure, Texture And Mechanical Properties Of Severely Deformed Interstitial Free Steel, Sujoy S. Hazra, Azdiar A. Gazder, E V. Pereloma
Faculty of Engineering - Papers (Archive)
Ti-stabilised interstitial free (IF) steel initially subjected to 8 passes, route BC equal channel angular pressing (ECAP) was further cold rolled (CR) at room temperature to 95% thickness reduction. Both samples were isothermally annealed at 710 °C following which their microstructures and micro-textures were compared via electron back-scattering diffraction (EBSD). The mechanical properties first obtained by shear punch testing (SPT) were later corroborated by uniaxial tensile tests. In the case of the ECAP material, continuous recrystallisation is followed by abnormal growth at prolonged annealing times with minor increases in high angle boundary (HAGB) fraction. On the other hand, the …
Long-Distance Walking Effect On Below-Knee Amputee Compensatory Gait Patterns And Implications On Prosthetic Designs And Training, L F. Yeung, Aaron Leung, Ming Zhang, Winson Lee
Long-Distance Walking Effect On Below-Knee Amputee Compensatory Gait Patterns And Implications On Prosthetic Designs And Training, L F. Yeung, Aaron Leung, Ming Zhang, Winson Lee
Faculty of Engineering and Information Sciences - Papers: Part A
Trans-tibial amputees are advised to walk as much as able people to achieve healthy and independent life. However, they usually have difficulties in doing so. Previous researches only included data from a few steps when studying the gait of amputees. Walking over a long distance was rarely examined. The objective of this study was to investigate the changes in spatial-temporal, kinetic and kinematic gait parameters of trans-tibial amputees after long-distance walking. Six male unilateral trans-tibial amputees performed two sessions of 30-min walking on a level treadmill at their self-selected comfortable speed. Gait analysis was undertaken over-ground: (1) before walking, (2) …
The Effect Of Incomplete Mixing Upon The Belousov-Zhabotinskii Reaction, Ahmed Hussein Msmali, Mark I. Nelson, Maureen P. Edwards
The Effect Of Incomplete Mixing Upon The Belousov-Zhabotinskii Reaction, Ahmed Hussein Msmali, Mark I. Nelson, Maureen P. Edwards
Faculty of Engineering and Information Sciences - Papers: Part A
The aim of this research to investigate the effect of incomplete mixing upon the existence of periodic solutions. To this end we study the behaviour of the Belousov- Zhabotinskii (B-Z) reaction in a batch reactor. The B-Z reaction is a well studied chemical system that exhibits periodic behaviour. Furthermore, simplified mathematical models exist which have been validated both against experimental data and larger chemical mechanisms. Specifically, we study the `Oregonator' model for the B-Z reaction due to Field and Noyes (1974). This consists of five chemical reactions involving three independent chemical intermediates. We extend this model by combining it with …
Terahertz Photon Mixing Effect In Graphene And Topological Insulator, Yee Sin Ang, Qinjun Chen, Xiaolin Wang, R A. Lewis, Chao Zhang
Terahertz Photon Mixing Effect In Graphene And Topological Insulator, Yee Sin Ang, Qinjun Chen, Xiaolin Wang, R A. Lewis, Chao Zhang
Faculty of Engineering and Information Sciences - Papers: Part A
We theoretically investigate the nonlinear terahertz photon-mixing effect in graphene and topological insulator. We show that the nonlinear intraband optical absorption in both materials dominate over the linear response under a very moderate external electric field strength. The nonlinear response is thermally enhanced and the optical nonlinearity is well-preserved even in high temperature regime.
Effect Of Coiling Temperature On Oxide Scale Of Hot-Rolled Strip, Xianglong Yu, Zhengyi Jiang, Xiaodong Wang, Dongbin Wei, Quan Yang
Effect Of Coiling Temperature On Oxide Scale Of Hot-Rolled Strip, Xianglong Yu, Zhengyi Jiang, Xiaodong Wang, Dongbin Wei, Quan Yang
Faculty of Engineering and Information Sciences - Papers: Part A
The influence of the coiling temperature, ranging from 550 to 570℃, on the morphology and the phase composition of the oxide scale formed on the microalloyed low carbon steel for automobiles after hot strip rolling was investigated. Physicochemical characteristics of the oxide scales were examined and their formation mechanism was discussed. Thickness of the oxide scale is in the range of 8-11μm and decreases with a decrease of coiling temperature. The microstructure and phase composition, XRD analysis shows a large amount of magnetite (Fe3O4) and some sparse hematite (Fe2O3) exist on the surface of hot rolled strip when the coiling …
The Effect Of Chromium Addition On The Strain Ageing And Recrystallisation Behaviour Of Low Carbon Steel, Elena Pereloma, V Bata, Azdiar A. Gazder
The Effect Of Chromium Addition On The Strain Ageing And Recrystallisation Behaviour Of Low Carbon Steel, Elena Pereloma, V Bata, Azdiar A. Gazder
Faculty of Engineering and Information Sciences - Papers: Part A
The strain ageing and recrystallisation behaviour of conventional low carbon A06 steel was compared with those containing varying amounts of chromium (0.26, 0.52 and 0.74 wt.%). The results show that the A06 steel undergoes four stages of strain ageing: (i) the pinning by solute atoms of dislocations generated during pre-strain, (ii) the generation of fresh dislocations from grain boundaries, (iii) the onset of precipitation and, (iv) the inhibition of dislocation generation from grain boundaries due to pinning by carbon segregation. On the other hand, the chromium containing steels only exhibit the fIrst three stages of strain ageing. An approximately twofold …
Multifunctionality From Coexistence Of Large Magnetoresistance And Magnetocaloric Effect In La0.7ca0.3mno3, J. C. Debnath, R. Zeng, J. H. Kim, S. X. Dou
Multifunctionality From Coexistence Of Large Magnetoresistance And Magnetocaloric Effect In La0.7ca0.3mno3, J. C. Debnath, R. Zeng, J. H. Kim, S. X. Dou
Faculty of Engineering - Papers (Archive)
We report the existence of multifunctionality involving large magnetoresistance (MR) and magnetocaloric effect (MCE) near room temperature in La0.7Ca0.3MnO3. A peak in the temperature dependence of the magnetoresistance and a change in the magnetic entropy (ΔSM) are observed at 251 K, with a maximum magnetoresistance MR (defined as ρ(0)∕ρ(H)−1) of about 206% and a maximum ΔSM of approximately 7.54 J∕kgK, at a field of 5 T, where the Curie temperature (TC) and metal‐insulator transition coexist at 251 K. The magnetic entropy change is measured on the basis of resistive …
Effect Of Ti And N Concentrations On Microstructure And Mechanical Properties Of Microalloyed High Strength Line Pipe Steel Welds, Leigh Fletcher, Zhixiong Zhu, Marimuthu Murugananth, Lei Zheng, Mingzhuo Bai, Huijun Li, F Barbaro
Effect Of Ti And N Concentrations On Microstructure And Mechanical Properties Of Microalloyed High Strength Line Pipe Steel Welds, Leigh Fletcher, Zhixiong Zhu, Marimuthu Murugananth, Lei Zheng, Mingzhuo Bai, Huijun Li, F Barbaro
Faculty of Engineering - Papers (Archive)
A selection of nine heats of line pipe steel from the same project with different Ti and N content were used to evaluate the effects of Ti/N ratio on weld zone microstructure, hardness and prior austenite grain size (PAGS) in the coarse grained heat-affected zone (CGHAZ). It was shown that the microstructure of the base metal (BM) mainly consisted of fine grained polygonal ferrite with fine islands of pearlite. The weld metal (WM) microstructure was predominantly acicular ferrite with a small volume fraction of pro-eutectoid ferrite. The CGHAZ consisted of bainitic ferrite and islands of martensite-austenite. The inside region of …
The Effect Of Sulfur Concentration In Liquid Iron On Mineral Layer Formation During Coke Dissolution, Michael W. Chapman, Brian J. Monaghan, Sharon Nightingale, John G. Mathieson, Robert J. Nightingale
The Effect Of Sulfur Concentration In Liquid Iron On Mineral Layer Formation During Coke Dissolution, Michael W. Chapman, Brian J. Monaghan, Sharon Nightingale, John G. Mathieson, Robert J. Nightingale
Faculty of Engineering - Papers (Archive)
The effects of sulfur concentration in liquid iron on mineral layer development between coke and iron as coke dissolves in a 2 mass % carbon-iron liquid have been investigated at 1500°C. Initial sulfur in iron concentrations used ranged from 0.006 to 0.049 mass %. Key findings include that the two stage dissolution behavior exhibited in the carbon transfer from coke to iron as reported in a previous study by the authors, at low initial sulfur in iron contents, was also apparent at the higher values used in this study. This two stage behavior was attributed to a change in the …
Effect Of Initial Static Shear Stress On The Undrained Cyclic Behavior Of Saturated Sand By Torsional Shear Loading, Gabriele Chiaro, Takeshi Sato, Takashi Kiyota, Junichi Koseki
Effect Of Initial Static Shear Stress On The Undrained Cyclic Behavior Of Saturated Sand By Torsional Shear Loading, Gabriele Chiaro, Takeshi Sato, Takashi Kiyota, Junichi Koseki
Faculty of Engineering - Papers (Archive)
With the aim of gaining a better understanding of the role which the static shear plays on the large-deformation behavior of saturated sand, a series of undrained cyclic torsional shear tests on saturated Toyoura sand specimens up to single amplitude shear strain of about 50 % were performed. Several hollow cylinder specimens at relative density of 44 - 48 % were tested while varying the initial static shear and the subsequent cyclic shear stress levels. Depending on the degree of stress reversal, the loading pattern could be classified into three groups: stress reversal, intermediate and non-reversal. The observed failure behavior …
Mr Damper In Reducing Pounding Effect Of Base-Isolated Rc Highway Bridge, M Neaz Sheikh, Jingya Xiong, Weihua Li
Mr Damper In Reducing Pounding Effect Of Base-Isolated Rc Highway Bridge, M Neaz Sheikh, Jingya Xiong, Weihua Li
Faculty of Engineering - Papers (Archive)
Significant structural damage due to pounding between adjacent superstructures of multispan reinforced concrete (RC) highway bridges has been observed in past earthquakes. Different methods have been proposed in the literature to mitigate the adverse pounding effect. This paper presents an analytical investigation on the use of magnetorheological (MR) dampers in reducing the pounding effect of base-isolated multi-span RC highway bridges. It has been observed that MR damper can effectively reduce adverse pounding effect. Three control strategies (passive off, passive on, and bang bang control) of MR damper have been investigated. Although all the control strategies are found to be effective, …
Effect Of Thermal Strain On J(C) And T-C In High Density Nano-Sic Doped Mgb2, Wenxian Li, Rong Zeng, Lin Lu, S. X. Dou
Effect Of Thermal Strain On J(C) And T-C In High Density Nano-Sic Doped Mgb2, Wenxian Li, Rong Zeng, Lin Lu, S. X. Dou
Faculty of Engineering - Papers (Archive)
The influences of lattice strain on the superconducting critical current density Jc and critical transition temperature Tc in pure MgB2 and a SiC-MgB2 composite made by the diffusion process are explored, based on the thermal expansion coefficients and the low temperature effects on Raman scattering. The strong thermal strain provides a strong flux pinning force for the supercurrents at the interfaces between SiC and MgB2. The high Tc of SiC-MgB2 is also discussed according to the expanded lattice and Raman characteristics.
Effect Of Different Additives On The Hydrogen Storage Properties Of The Mgh 2-Lialh 4 Destabilized System, S X. Dou, Yue Zhao, Xuebin Yu, Mohammad Ismail
Effect Of Different Additives On The Hydrogen Storage Properties Of The Mgh 2-Lialh 4 Destabilized System, S X. Dou, Yue Zhao, Xuebin Yu, Mohammad Ismail
Faculty of Engineering - Papers (Archive)
The hydrogen storage properties of the MgH2-LiAlH4 (4 : 1) composite system with and withoutadditives were studied. 5 wt.% of TiF3, NbF5, NiF2, CrF2, YF3, TiCl3?1/3AlCl3, HfCl4, LaCl3, CeCl3,and NdCl3, respectively, was added to the MgH2-LiAlH4 (4 : 1) mixture, and their catalytic effect wasinvestigated. Temperature programmed desorption results show that addition of metal halides to theMgH2-LiAlH4 (4 : 1) composite system improves the onset desorption temperature. The hydrogendesorption properties of metal halide-doped MgH2-LiAlH4 (4 : 1) composites were also improved ascompared to the undoped MgH2-LiAlH4 (4 : 1) composite. Furthermore, the activation energy andthe change in enthalpy in the …
Bauschinger Effect In Microalloyed Steels: Part Ii. Influence Of Work Softening On Strength Development During Uoe Line-Pipe Forming, Andrii Kostryzhev, Martin Strangwood, Claire L. Davis
Bauschinger Effect In Microalloyed Steels: Part Ii. Influence Of Work Softening On Strength Development During Uoe Line-Pipe Forming, Andrii Kostryzhev, Martin Strangwood, Claire L. Davis
Faculty of Engineering and Information Sciences - Papers: Part A
The Bauschinger effect (a reduced yield stress at the start of reverse deformation following forward prestrain) is an important factor of strength development for cold metal forming technology. In steels, the magnitude of the Bauschinger effect depends on composition, through the presence of microalloy precipitates, and prior processing, through the size and distribution of the microalloy precipitates and the presence of retained work hardening. In this article, the parameters of the Bauschinger effect and work hardening (coefficient and exponent) in forward and reverse deformations were quantitatively related to the particle number density and dislocation density for two high-strength low-alloy (HSLA) …
Effect Of The Carbon Nanotube Surface Characteristics On The Conductivity And Dielectric Constant Of Carbon Nanotube/Poly(Vinylidene Fluoride) Composites, S A. Carabineiro, Manuel F. Pereira, J Nunes-Pereira, Cristina Caparrós, Vitor Sencadas, Senentxu Lanceros-Méndez
Effect Of The Carbon Nanotube Surface Characteristics On The Conductivity And Dielectric Constant Of Carbon Nanotube/Poly(Vinylidene Fluoride) Composites, S A. Carabineiro, Manuel F. Pereira, J Nunes-Pereira, Cristina Caparrós, Vitor Sencadas, Senentxu Lanceros-Méndez
Faculty of Engineering and Information Sciences - Papers: Part A
Commercial multi-walled carbon nanotubes (CNT) were functionalized by oxidation with HNO3, to introduce oxygen-containing surface groups, and by thermal treatments at different temperatures for their selective removal. The obtained samples were characterized by adsorption of N2 at -196°C, temperature-programmed desorption and determination of pH at the point of zero charge. CNT/poly(vinylidene fluoride) composites were prepared using the above CNT samples, with different filler fractions up to 1 wt%. It was found that oxidation reduced composite conductivity for a given concentration, shifted the percolation threshold to higher concentrations, and had no significant effect in the dielectric response.
Magnetocaloric Effect In Layered Ndmn2ge0.4si1.6, Jianli Wang, S.J Campbell, J.M Cadogan, A J Studer, Rong Zeng, S. X. Dou
Magnetocaloric Effect In Layered Ndmn2ge0.4si1.6, Jianli Wang, S.J Campbell, J.M Cadogan, A J Studer, Rong Zeng, S. X. Dou
Faculty of Engineering - Papers (Archive)
A giant magnetocaloric effect has been observed in NdMn2Ge0.4Si1.6 associated with the first-order magnetic phase transition from antiferromagnetism to ferromagnetism around TC = 36 K. The magnetic entropy change –ΔSM and adiabatic temperature change ΔTad have been determined from magnetization and specific heat measurements (B = 0–5 T) with –ΔSM calculated by the Maxwell relation and Clausius–Clapeyron method. The values –ΔSMmax = 12.3 J kg−1 K−1 and refrigerant capacity ∼ 95 J/kg for ΔB = 0–2 T as derived from …
Effect Of Magnetostatic Field On Microstructure Of 5005 Aluminum Alloy Sheet By Roll-Casting, Jintao Li, Guangming Xu, Jianzhong Cui
Effect Of Magnetostatic Field On Microstructure Of 5005 Aluminum Alloy Sheet By Roll-Casting, Jintao Li, Guangming Xu, Jianzhong Cui
Faculty of Engineering and Information Sciences - Papers: Part A
The roll-casting technology of 5000 series aluminum alloy is one of the difficulties at present. Roll-casting technology was employed in this paper and high quality 5005 aluminum alloy sheets were fabricated successfully under different conditions. The solidification of melt in roll-casting process is the rapid directional solidification. The effect of magnetostatic field on microstructure of 5005 aluminum alloy sheet by roll-casting has been investigated and analyzed. The results indicate that imposing magnetostatic field can refine the grains of 5005 aluminum alloy.
Effect Of Fouling On Removal Of Trace Organic Compounds By Nanofiltration, Shima Hajibabania, A Verliefde, Jörg E Drewes, Long Nghiem, J Mc Donald, S Khan, P Le-Clech
Effect Of Fouling On Removal Of Trace Organic Compounds By Nanofiltration, Shima Hajibabania, A Verliefde, Jörg E Drewes, Long Nghiem, J Mc Donald, S Khan, P Le-Clech
Faculty of Engineering - Papers (Archive)
The fate of chemical of concern is not yet fully understood during treatment of impaired waters. The aim of this paper is to assess the impact of different organic-based fouling layers on the removal of a large range of trace organics. Both model and real water samples (mixed with trace organic contaminants at environmental concentration of 2 μg l−1) were used to simulate fouling in nanofiltration under controlled environment. The new and fouled membranes were systematically characterised for surface charge, hydrophobicity and roughness. It was observed that fouling generally reduced the membrane surface charge; however, the alterations of the membrane …