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- Faculty of Engineering and Information Sciences - Papers: Part A (77)
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Articles 181 - 197 of 197
Full-Text Articles in Engineering
Modelling Of High Strength Concrete Reinforced With Helical Reinforcement, Muhammad N. S Hadi
Modelling Of High Strength Concrete Reinforced With Helical Reinforcement, Muhammad N. S Hadi
Faculty of Engineering - Papers (Archive)
This paper investigates the behaviour of high strength concrete beams reinforced with helical reinforcement in the compression zone. Using helical reinforcement increases the strength and ductility of high strength concrete. The finite element packages ANSYS and Strand7 have been used to model high strength concrete beams with helical pitches of 25, 50, 75, 100 and 150 mm. Three dimensional elements were used to model the concrete and bar elements to model the steel.Special care had to be taken when modelling the helices. The results of finite element analyses were compared with experimental results which showed a good correlation.
Amorphous Carbon-Coated Silicon Nanocomposites: A Low-Temperature Synthesis Via Spray Pyrolysis And Their Application As High-Capacity Anodes For Lithium-Ion Batteries, See How Ng, Jiazhao Wang, David Wexler, Sau Yen Chew, Hua-Kun Liu
Amorphous Carbon-Coated Silicon Nanocomposites: A Low-Temperature Synthesis Via Spray Pyrolysis And Their Application As High-Capacity Anodes For Lithium-Ion Batteries, See How Ng, Jiazhao Wang, David Wexler, Sau Yen Chew, Hua-Kun Liu
Faculty of Engineering - Papers (Archive)
This article introduces an effective, inexpensive, and industrially oriented approach to produce carbon-coated Si nanocomposites as high-capacity anode materials for use in rechargeable lithium-ion batteries. Initially, nanosized Si particles (nm) were mixed in a citric acid/ethanol solution via ultrasonication. This mixture was further spray-pyrolyzed in air at low processing temperature (300-500 C), resulting in a homogeneous layer of carbon coating on the surface of the spheroidal Si nanoparticles. The effects of the processing temperature on the amorphous carbon content, the thickness of the carbon-coating layer, and the homogeneity of the carbon coating were studied in detail. These parameters strongly influenced …
Band Structures, Magnetic Properties, And Enhanced Magnetoresistance In The High Pressure Phase Of Gd And Y Doped Two-Dimensional Perovskite Sr2coo4 Compounds, Xiaolin Wang, E Takayama-Muromachi, S X. Dou, Zhenxiang Cheng
Band Structures, Magnetic Properties, And Enhanced Magnetoresistance In The High Pressure Phase Of Gd And Y Doped Two-Dimensional Perovskite Sr2coo4 Compounds, Xiaolin Wang, E Takayama-Muromachi, S X. Dou, Zhenxiang Cheng
Australian Institute for Innovative Materials - Papers
The authors present their studies on the band structures and on the magnetic and magnetotransport properties of the high pressure phase of Sr2-xRExCoO4 [rare earth (RE)=Gd and Y, x=0.1-0.5] compounds which were synthesized by a high pressure and high temperature technique. The authors found that as x increases, the magnetoresistance {(PH-P0)/p0} increases up to -17% at 5 K and 7 T, which is 2.5 times higher than that for undoped Sr2CoO4, although the ferromagnetic transition drops from 255 to 200 K for the Gd doping with x=0.3. …
Ductile Ultrafine-Grained Ti-Based Alloys With High Yield Strength, Lai-Chang Zhang, Hai-Bo Lu, Christine Mickel, Jurgen Eckert
Ductile Ultrafine-Grained Ti-Based Alloys With High Yield Strength, Lai-Chang Zhang, Hai-Bo Lu, Christine Mickel, Jurgen Eckert
Faculty of Engineering - Papers (Archive)
The authors report on ductile ultrafine-grained (Ti0.72Fe0.28)100−xTax (0 ⩽ x ⩽ 4) alloys with not only high fracture strength but simultaneously high yield strength exceeding 2000 MPa along with distinct plasticity, which are superior to high-strength Ti-based bulk metallic glasses and bimodal composites. All alloys mainly consist of β-Ti and FeTi solid solutions but display different microstructures. The alloys exhibit a high fracture strength >2500 MPa and a high yield strength >2000 MPa as well as large plasticity of ∼ 5%–7.5%. The microstructure-property correlation of these ultrafine-grained alloys is discussed.
Formation Of Magnesium Diboride-Based Materials With High Critical Currents And Mechanical Characteristics By High-Pressure Synthesis, Tetiana Prikhna, W. Gawalek, Ya M. Savchuk, N. V. Sergienko, V. E. Moshchil, M. Wendt, M. Zeisberger, T. Habisreuther, V. B. Sverdun, S X. Dou, S. N. Dub, V. S. Melnikov, Ch Schmidt, J. Dellith, P. A. Nagorny
Formation Of Magnesium Diboride-Based Materials With High Critical Currents And Mechanical Characteristics By High-Pressure Synthesis, Tetiana Prikhna, W. Gawalek, Ya M. Savchuk, N. V. Sergienko, V. E. Moshchil, M. Wendt, M. Zeisberger, T. Habisreuther, V. B. Sverdun, S X. Dou, S. N. Dub, V. S. Melnikov, Ch Schmidt, J. Dellith, P. A. Nagorny
Australian Institute for Innovative Materials - Papers
The developed method of high-pressure synthesis (HPS) allows producing nanostructural highly dense material based on MGB2, which possesses the highest superconducting and mechanical characteristics among the known world analogues, in the form of blocks that are suitable for application in SC electromotors and pumps. Additions of Zr can increase critical current density (jc) of synthesized at 2 GPa and 750-800 °C MGB2 in the same manner as additions of Ta or Ti, i.e. due to the absorption of impurity hydrogen forming the ZrH2. The formation of ZrB2 phase at higher synthesis …
High Field Zeeman Spectroscopy Of Beryllium In Germanium, P. C. Jobe Prabaker, Peter Fisher, Rodney E. M. Vickers
High Field Zeeman Spectroscopy Of Beryllium In Germanium, P. C. Jobe Prabaker, Peter Fisher, Rodney E. M. Vickers
Faculty of Engineering - Papers (Archive)
The ground states of group II impurities in Ge are complex. For Zn(0) only the lowest is occupied at 4.2 K which is not the case for Be(0). The unperturbed spectrum of Be(0) is more complex than that of Zn(0), the G line being simplest. Reported here is a Zeeman study of the G line of Be(0) at fields up to 6 T.
Comparison Of Small-Field Behaviour In Mgb2, Low And High Temperature Superconductors, Alexey V. Pan, S X. Dou
Comparison Of Small-Field Behaviour In Mgb2, Low And High Temperature Superconductors, Alexey V. Pan, S X. Dou
Australian Institute for Innovative Materials - Papers
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 MgB2bulk superconductors, or to thermally activated processes for Bi-based superconductors and YBa2Cu3O7−δ superconducting …
Development And Characterization Of A High-Resolution Microspect System For Small-Animal Imaging, Yujin Qi, Benjamin Tsui, Yuchuan Wang, Brian Yoder, R Wojcik, S Majewski, A G Weisenberger
Development And Characterization Of A High-Resolution Microspect System For Small-Animal Imaging, Yujin Qi, Benjamin Tsui, Yuchuan Wang, Brian Yoder, R Wojcik, S Majewski, A G Weisenberger
Faculty of Engineering and Information Sciences - Papers: Part A
We developed a high-resolution microSPECT system and investigated its performance characteristics for small animal imaging. The microSPECT system consists of a stationary compact gamma camera with interchangeable pinhole and parallel-hole collimators and vertical object rotation mechanism. The modular camera is based on a pixellated NaI(Tl) crystal array with 1.2 mm pixel size and 1.4 mm pixel pitch coupled to a 5” diameter Hamamatsu R3292 PSPMT. The pinhole collimator has a 10cm focal length fitted with keel-edge pinhole apertures with diameters of 1.0, 1.5 and 2.0 mm. The system performance was characterized by the measurements of the point source response function …
High-Temperature Creep-Deformation Behavior Of The Ni-Based Superalloy M963, Hongtao Zhu, Cheng Lu, A K. Tieu, Lizi He, Q. Zheng, X. F. Sun, Z. Q. Hu, H. R. Guan
High-Temperature Creep-Deformation Behavior Of The Ni-Based Superalloy M963, Hongtao Zhu, Cheng Lu, A K. Tieu, Lizi He, Q. Zheng, X. F. Sun, Z. Q. Hu, H. R. Guan
Faculty of Engineering - Papers (Archive)
The high-temperature creep-deformation behavior of a Ni-based M963 superalloy has been investigated over a broad stress range of 80 to 600 MPa at high temperatures (800 °C to 975 °C). The detailed dislocation configurations at different creep stages are examined through transmission electron microscopy (TEM). The results show that the deformation mechanism is stress and temperature dependent and mainly consists of three dislocation-controlling mechanisms: stacking faults and dislocation-pair shearing, dislocation bowing and Orowan looping, and dislocation climb.
Zeeman Spectra Of Boron In Germanium At High Magnetic Fields, R.E.M. Vickers, R. A. Lewis, P. Fisher, Y-J. Wang
Zeeman Spectra Of Boron In Germanium At High Magnetic Fields, R.E.M. Vickers, R. A. Lewis, P. Fisher, Y-J. Wang
Faculty of Engineering - Papers (Archive)
No abstract provided.
Composite Steel-Concrete Beams And Columns Fabricated With High Strength Steel (Hss) Plate, Brian Uy
Composite Steel-Concrete Beams And Columns Fabricated With High Strength Steel (Hss) Plate, Brian Uy
Faculty of Engineering - Papers (Archive)
High strength quenched and tempered structural steel has seen widespread implementation in heavily loaded columns in multistorey building construction. However, many current international codes do not cater for the use o f high strength steel and thus much needed research is required to give structural engineers the confidence to use this new and innovative material in a safe and efficient manner in construction. Herein, experiments and analytical studies on composite steel-concrete composite beams and recommendations for modified . design procedures will be summarised. This paper will also provide a comprehensive summary of experimental results on the uses of high strength …
In Pursuit Of High-Force/High-Stroke Conducting Polymer Actuators, Geoffrey M. Spinks, Binbin Xi, Toni E. Campbell, Philip G. Whitten, Vahid Mottaghitalab, Mehrdad Bahrami Samani, G G. Wallace
In Pursuit Of High-Force/High-Stroke Conducting Polymer Actuators, Geoffrey M. Spinks, Binbin Xi, Toni E. Campbell, Philip G. Whitten, Vahid Mottaghitalab, Mehrdad Bahrami Samani, G G. Wallace
Faculty of Engineering - Papers (Archive)
Conducting polymer actuators are being investigated for a number of applications. Both linear contracting/expanding and bending type actuators can be constructed that utilise the redox-induced volume changes in the conducting polymer. Improved actuator performance has been demonstrated by modifications to our helix-tube design. The pitch of the helix and bundling the actuators have increased the strain and force generated. Short-term improvements to the strain were also generated using new dopants, but cycle life was poor in this case. Further studies on the mechanism of actuation have continued to focus attention on the influence of the elastic modulus on the actuation …
Analysis And Design Of Double-Sided High-Rise Steel Pallet Rack Frames, Lip H. Teh, Gregory J. Hancock, Murray J. Clarke
Analysis And Design Of Double-Sided High-Rise Steel Pallet Rack Frames, Lip H. Teh, Gregory J. Hancock, Murray J. Clarke
Faculty of Engineering - Papers (Archive)
In routine design of steel storage rack frames, it is far more common to perform two dimensional (2D) rather than three dimensional (3D) linear buckling analyses. In this paper, it is demonstrated that the global buckling behavior of high-rise steel storage rack frames may not be revealed by 2D buckling analyses as 3D interaction modes are involved. It is shown that the monosymmetric upright columns of a high-rise rack frame fail in a flexural–torsional mode due to the shear-center eccentricity of the sections, and that the 3D frame buckling analysis is more reliable in determining the critical members of a …
Glass Formation In A (Ti,Zr,Hf)-(Cu,Ni,Ag)-Al High-Order Alloy System By Mechanical Alloying, L C. Zhang, Z Q. Shen, Jian Xu
Glass Formation In A (Ti,Zr,Hf)-(Cu,Ni,Ag)-Al High-Order Alloy System By Mechanical Alloying, L C. Zhang, Z Q. Shen, Jian Xu
Faculty of Engineering and Information Sciences - Papers: Part A
In this work, glass formation under high-energy ball milling was investigated for a (Ti0.33Zr0.33Hf0.33)50(Ni0.33Cu0.33Ag0.33)40Al10 high-order alloy system with equiatomic substitution for early and late transition-metal contents. For comparison, an amorphous alloy ribbon with the same composition was prepared using the melt-spinning method as well. Structural features of the samples were characterized using x-ray diffraction, transmission electron microscopy, and differential scanning calorimetry. Mechanical alloying resulted in a glassy alloy similar to that obtained by melt spinning. However, the glass formation was incomplete, and a …
New Generation Coatings For High Speed Cutting Tools, Devi P. Saini, M Ali
New Generation Coatings For High Speed Cutting Tools, Devi P. Saini, M Ali
Faculty of Engineering - Papers (Archive)
CVD coatings have been traditionally used for enhancing the life of cemented carbide tools in machining operations. Due to several inherent advantages over CVD coatings, more recently the PVD coatings have been employed on cutting tools for improvement of their wear resistance and performance in machining operations. Significant variability in the tool life and performance of PVD coated tools has, however, been observed by several researchers. Such variability in tool life, which is a big hindrance in successful automation as well as planning of machining operations, is considered to result from a combination of factors including poor adhesion between substrate …
High-Resolution Hi Observations Of The Western Magellanic Bridge, E Muller, L Staveley-Smith, William Zealey, S Stanimirovic
High-Resolution Hi Observations Of The Western Magellanic Bridge, E Muller, L Staveley-Smith, William Zealey, S Stanimirovic
Faculty of Engineering and Information Sciences - Papers: Part A
The 21-cm line emission from a 7 × 6 deg2 region east of and adjoining the Small Magellanic Cloud (SMC) has been observed with the Australia Telescope Compact Array and the Parkes telescopes. This region represents the westernmost part of the Magellanic Bridge, a gas-rich tail extending ∼14° to the Large Magellanic Cloud. A rich and complex neutral hydrogen (H i) structure containing shells, bubbles and filaments is revealed. On the larger scale, the H i of the Bridge is organized into two velocity components. This bimodality, which appears to originate in the SMC, converges to a single velocity …
Thermal Diffusivity Of Iron At High Temperature In Both The Liquid And Solid States, Brian J. Monaghan, P N Quested
Thermal Diffusivity Of Iron At High Temperature In Both The Liquid And Solid States, Brian J. Monaghan, P N Quested
Faculty of Engineering - Papers (Archive)
Process models that simulate industrial processes are increasingly being used to reduce costs and improve productivity. 1–8) The success of such models is highly dependent on the thermophysical property data used in the simulation calculations. Unfortunately high temperature thermophysical data for liquid metals and slags are scarce. Also what data that are available often have a high uncertainty associated with them.1,2,9–11) Therefore regardless of how well a process model may be physically based it is likely, given the current state of high temperature thermophysical property data, in particular heat capacity, viscosity and thermal conductivity/ diffusivity, that the models predictions will …