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Articles 1 - 13 of 13
Full-Text Articles in Engineering
Parametric Study Of Unsaturated Drainage Layers In A Capillary Barrier, C. E. Morris, J. C. Stormont
Parametric Study Of Unsaturated Drainage Layers In A Capillary Barrier, C. E. Morris, J. C. Stormont
Faculty of Engineering - Papers (Archive)
Unsaturated drainage layers (UDLs) have been demonstrated to greatly increase the lateral diversion capacity of capillary barriers. The inclusion of a UDL allows native soils suitable for vegetation growth to be used as the finer soil as lateral drainage properties of the layer no longer need to be considered. A comprehensive numerical study was conducted to investigate the influence of the interface slope and the UDL material on the system’s ability to laterally divert downward moving moisture. A capillary barrier system with and without a UDL was simulated for 10 years using daily varying climatic data for three locations in …
Dielectric Function Of An Electron Gas Under Intense Laser Radiation In Quantizing Magnetic Fields, W. Xu
Dielectric Function Of An Electron Gas Under Intense Laser Radiation In Quantizing Magnetic Fields, W. Xu
Faculty of Engineering - Papers (Archive)
A detailed theoretical study on dielectric function of a three-dimensional electron gas (3DEG), subject to linearly polarized intense laser field and to strong static magnetic field, is presented. Using the Green’sfunction approach, I have derived the density-density correlation function and the random-phaseapproximation dielectric function for a 3DEG in t and representation. It is found that in the presence of intense terahertz laser field, the dielectric function of an electron gas depends strongly on frequency and intensity of the electromagnetic radiation. A number of important radiation effects, pertinent to the application of the free-electron laser sources developed recently, are presented and …
Nature And Properties Of Acid Sulphate Soils In Drained Coastal Lowlands In New South Wales, Buddhima Indraratna, B. Blunden, A. Nethery
Nature And Properties Of Acid Sulphate Soils In Drained Coastal Lowlands In New South Wales, Buddhima Indraratna, B. Blunden, A. Nethery
Faculty of Engineering - Papers (Archive)
Acid sulphate soils pose severe constraints to the protection of engineering infrastructure, sustainable agriculture and environmental quality in coastal estuarine systems in many parts of Australia. The nature and properties of acid sulphate soils are described with reference to data collected from intensively drained coastal lowlands located on the South Coast of New South Wales.
Nickel Hydroxide As An Active Material For The Positive Electrode In Rechargeable Alkaline Batteries, J Chen, D. H. Bradhurst, S X. Dou, Hua-Kun Liu
Nickel Hydroxide As An Active Material For The Positive Electrode In Rechargeable Alkaline Batteries, J Chen, D. H. Bradhurst, S X. Dou, Hua-Kun Liu
Faculty of Engineering - Papers (Archive)
Spherical nickel hydroxide powders coprecipitated with the additives Ca(OH)2, Co(OH)2, and Zn(OH)2 were prepared through a spraying technique. These powders, which have a higher tapping density and a much smaller pore volume and crystalline size than conventional powders, were used as the active materials of nickel hydroxide electrodes. The effects of the Ca(OH)2, Co(OH)2, and Zn(OH)2 additions on electrode properties such as charge-discharge, reversibility of the electrode reaction, and cycle life, were studied. The relationship between the electrode swelling and the formation of g-NiOOH was also investigated. The results show that nickel hydroxide powders having a smaller crystallite size show …
The Electrode Properties Of Mg1.9al0.1ni0.8co0.1mn0.1 Alloy By Mechanical Grinding With Ni Powders, L. Sun, Hua-Kun Liu, D. H. Bradhurst, S. X. Dou
The Electrode Properties Of Mg1.9al0.1ni0.8co0.1mn0.1 Alloy By Mechanical Grinding With Ni Powders, L. Sun, Hua-Kun Liu, D. H. Bradhurst, S. X. Dou
Faculty of Engineering - Papers (Archive)
A modified magnesium alloy of composition Mg1.9Al0.1Ni0.8Co0.1Mn0.1 was prepared by mechanical grinding with Ni powder for periods up to 120 h. The resulting structures of the Mg1.9Al0.1Ni0.8Co0.1Mn0.1 alloys were found to be amorphous. The electrodes of the modified Mg1.9Al0.1Ni0.8Co0.1Mn0.1 alloys had large discharge capacities. At a discharge current rate of 50 mA/g, the capacity was 630 mAh/g after 50 h of mechanical grinding and 510 mAh/g after 120 h of mechanical grinding.
Fission Converter And Metal–Oxide–Semiconductor Field Effect Transistor Study Of Thermal Neutron Flux Distribution In An Epithermal Neutron Therapy Beam, G. I. Kaplan, Anatoly B. Rosenfeld, B. J. Allen, J. A. Coderre, H. B. Liu
Fission Converter And Metal–Oxide–Semiconductor Field Effect Transistor Study Of Thermal Neutron Flux Distribution In An Epithermal Neutron Therapy Beam, G. I. Kaplan, Anatoly B. Rosenfeld, B. J. Allen, J. A. Coderre, H. B. Liu
Faculty of Engineering - Papers (Archive)
The depth distribution of the thermal neutron flux is a major factor in boron neutron capture therapy (BNCT) in determining the efficiency of cell sterilization. In this paper the fission detector method is developed and applied to measure the in-phantom thermal neutron flux depth distribution. Advantages of the fission detector include small size, direct measurement of thermal neutron flux in a mixed radiation field of BNCT beam, self-calibration, and the possibility of on-line measurement. The measurements were performed at epithermal a BNCT facility. The experimental results were compared with the thermal neutron flux calculated by the Monte Carlo method and …
Positive In-Plane And Negative Out-Of-Plane Magnetoresistance In The Overdoped High-Temperature Superconductor Bi2sr2cacu2o8 + X, G. Heine, W. Lang, Xiaolin Wang, S. X. Dou
Positive In-Plane And Negative Out-Of-Plane Magnetoresistance In The Overdoped High-Temperature Superconductor Bi2sr2cacu2o8 + X, G. Heine, W. Lang, Xiaolin Wang, S. X. Dou
Faculty of Engineering - Papers (Archive)
The in-plane and out-of-plane magnetoresistances of moderately overdoped Bi2Sr2CaCu2O8+x single crystals have been studied from Tc+5 K to Tc+100 K with the magnetic field oriented perpendicular and parallel to the current, respectively. The in-plane magnetoresistance is positive, the out-of-plane magnetoresistance negative, and their temperature variations depend on the orientation of the magnetic field. A recent theory for superconducting order parameter fluctuations is extended for the interaction of carrier spins with the magnetic field. The anomalous, anisotropic magnetoresistance can be described well by a unique set of physical parameters, which …
Quantum Point Contact In A Magnetic Field: Far-Infrared Resonant Heating Observed In Photoconductivity, R. J. Heron, R. A. Lewis, B. E. Kane, G. R. Facer, R. G. Clark, A. S. Dzurak, N. E. Lumpkin, R. P. Starrett, D. G. Rickel, L. N. Pfeiffer, K. W. West
Quantum Point Contact In A Magnetic Field: Far-Infrared Resonant Heating Observed In Photoconductivity, R. J. Heron, R. A. Lewis, B. E. Kane, G. R. Facer, R. G. Clark, A. S. Dzurak, N. E. Lumpkin, R. P. Starrett, D. G. Rickel, L. N. Pfeiffer, K. W. West
Faculty of Engineering - Papers (Archive)
We report on the far-infrared photoresponse of a quantum point contact device fabricated on a top-gated GaAs/AlGaAs heterostructure. The top-gated architecture avoids the disorder built into conventional modulation-doped structures. We observe a distinctive far-infrared magneto-photoresponse. This depends on the wavelength of the radiation and on the carrier density, which is controlled by the gate voltage. We conclude by comparison with transport data that the oscillations observed in photoconductivity and which are centred around the cyclotron energy arise from the resonant heating of electrons by the far-infrared radiation.
Central-Cell Corrections For Si And S In Gaas In A Strong Magnetic Field, R. J. Heron, R. A. Lewis, Philip E. Simmonds, R. P. Starrett, A. V. Skougarevsky, R G. Clark, C. R. Stanley
Central-Cell Corrections For Si And S In Gaas In A Strong Magnetic Field, R. J. Heron, R. A. Lewis, Philip E. Simmonds, R. P. Starrett, A. V. Skougarevsky, R G. Clark, C. R. Stanley
Faculty of Engineering - Papers (Archive)
The central-cell correction has been determined experimentally for the two donor impurities S and Si in GaAs. Data have been obtained for magnetic fields to 39 T, corresponding to γ~6. The observed behavior is in good agreement with theory. The analysis permits accurate evaluation of zero-field central-cell corrections, yielding 0.110 and 0.059 meV for S and Si, respectively.
Carbon Nanotube Actuators, R. H. Baughman, C. X. Cui, A. A. Zakhidov, Z. Iqbal, J. N. Barisci, Geoffrey M. Spinks, G G. Wallace, A. Mazzoldi, D. De Rossi, A. G. Rinzler, O. Jaschinski, S. Roth, M. Kertesz
Carbon Nanotube Actuators, R. H. Baughman, C. X. Cui, A. A. Zakhidov, Z. Iqbal, J. N. Barisci, Geoffrey M. Spinks, G G. Wallace, A. Mazzoldi, D. De Rossi, A. G. Rinzler, O. Jaschinski, S. Roth, M. Kertesz
Faculty of Engineering - Papers (Archive)
Electromechanical actuators based on sheets of single-walled carbon nanotubes were shown to generate higher stresses than natural muscle and higher strains than high-modulus ferroelectrics. Like natural muscles, the macroscopic actuators are assemblies of billions of individual nanoscale actuators. The actuation mechanism (quantum chemical-based expansion due to electrochemical double-layer charging) does not require ion intercalation, which limits the life and rate of faradaic conducting polymer actuators. Unlike conventional ferroelectric actuators, low operating voltages of a few volts generate large actuator strains. Predictions based on measurements suggest that actuators using optimized nanotube sheets may eventually provide substantially higher work densities per cycle …
Critical Current Degradation Caused By Winding Process Of Bi-2223/Ag Hts Wire In The Form Of A Coil, Jian X. Jin, S X. Dou, Hua-Kun Liu, T Hardono, Christopher D. Cook, C. Grantham
Critical Current Degradation Caused By Winding Process Of Bi-2223/Ag Hts Wire In The Form Of A Coil, Jian X. Jin, S X. Dou, Hua-Kun Liu, T Hardono, Christopher D. Cook, C. Grantham
Faculty of Engineering - Papers (Archive)
High T, superconducting (HTS) (Bi,Pb)2Sr2Ca2 Cu3010+xA g-clad wire has potential for practical applications in the form of a coil or a winding. This HTS wire has strong magnetic field-dependent and mechanical strain-dependent critical currents, consequently it faces a severe problem of critical current degradation when it is used in the form of a coil. To design a winding with this conductor, the critical current degradation has to be identified with relation to the magnetic fields and the winding process. This is important to optimize an appropriate coil winding procedure using this HTS wire. A specially designed non-inductive sample has been …
Measurements Of Ac Losses In Htsc Wires Exposed To An Alternating Field Using Calorimetric Methods, Tri Hardono, Christopher D. Cook, Jian Xun Jin
Measurements Of Ac Losses In Htsc Wires Exposed To An Alternating Field Using Calorimetric Methods, Tri Hardono, Christopher D. Cook, Jian Xun Jin
Faculty of Engineering - Papers (Archive)
Calorimetric methods for AC loss measurement for short superconducting wires have been investigated. The design, operation and results obtained from an experimental calorimeter are described. With these methods the total loss of a short superconducting sample exposed to a 50 Hz alternating field, both perpendicular and axial, have been measured with an accuracy of microwatts per centimeter. The sample is a 6 centimeter long (Bi,Pb)SrCaCuO-2223 silver-sheathed multifilamentary wire prepared by powder-in-tube techniques. The hysteresis part of the loss may be obtained by taking the eddy current component of the silver sheath from the total loss and by neglecting the coupling …
Experimental Investigation Into Segregation Of Bulk Solids During Gravity Filling Of Storage Bins, David B. Hastie, Peter W. Wypych
Experimental Investigation Into Segregation Of Bulk Solids During Gravity Filling Of Storage Bins, David B. Hastie, Peter W. Wypych
Faculty of Engineering - Papers (Archive)
This paper explains the phenomenon of segregation and previous methods used in its quantification. Also explained is the current research, which has attempted to develop a two dimensional sampling technique to quantify the degree of mixing present under gravity fill conditions. Binary mixtures have been prepared in varying proportions and charged into a test rig where sampling has taken place and the results analysed. From these results, a relationship between degree of mixing and product proportion has been developed.