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Articles 1 - 18 of 18
Full-Text Articles in Engineering
Exact Formula For Nondiagonal Green's Functions In Condensed-Matter Physics , T. Toyoda, Y. Takahashi, C. Zhang
Exact Formula For Nondiagonal Green's Functions In Condensed-Matter Physics , T. Toyoda, Y. Takahashi, C. Zhang
Faculty of Engineering - Papers (Archive)
An exact formula for the nondiagonal part of the one-particle temperature Green’s function is obtained within the framework of the nonperturbative canonical formulation of the finite-temperature generalized Ward-Takahashi relation. It is shown that the Landau-level Green’s function for two-dimensional electrons has a nonvanishing nondiagonal part if the electron-electron interaction is included.
Use Of A Narrow-Gap Prewell For The Optical Study Of Charge Buildup And The Fermi-Energy Edge Singularity In A Double-Barrier Resonant-Tunneling Structure , T. A. Fisher, P. D. Buckle, Philip E. Simmonds, R. J. Teissier, M. S. Skolnick, C. R. White, D. M. Whittaker, L. Eaves, B. Usher, P. C. Kemeny, R. Grey, G. Hill, M. A. Pate
Use Of A Narrow-Gap Prewell For The Optical Study Of Charge Buildup And The Fermi-Energy Edge Singularity In A Double-Barrier Resonant-Tunneling Structure , T. A. Fisher, P. D. Buckle, Philip E. Simmonds, R. J. Teissier, M. S. Skolnick, C. R. White, D. M. Whittaker, L. Eaves, B. Usher, P. C. Kemeny, R. Grey, G. Hill, M. A. Pate
Faculty of Engineering - Papers (Archive)
A strained InyGa1-yAs layer is incorporated adjacent to the emitter barrier of an AlxGa1-xAs/GaAs/AlxGa1-xAs double-barrier resonant-tunneling structure (DBRTS), so that it forms a prewell for the electrons that accumulate prior to tunneling into the GaAs quantum well (QW). Observation of photoluminescence (PL) and photoluminescence excitation (PLE) from the prewell then enables a direct optical determination of the charging behavior in the emitter-accumulation region to be achieved. We show in addition that an optical probe of the prewell can, by consideration of the electrostatics, provide a reliable determination of the charge distribution in the whole DBRTS at the peak of the …
Plasmon Assisted Resonant Tunneling In A Double Barrier Heterostructure , C. Zhang, M. L. Lerch, A. D. Martin, Philip E. Simmonds, L. Eaves
Plasmon Assisted Resonant Tunneling In A Double Barrier Heterostructure , C. Zhang, M. L. Lerch, A. D. Martin, Philip E. Simmonds, L. Eaves
Faculty of Engineering - Papers (Archive)
When a double barrier semiconductor structure is biased near a tunneling resonance, charge can accumulate in the quantum well. Coupling between this two dimensional electron gas and the tunneling current is investigated. Experimental data taken inside a region of apparent bistability in one device reveal a satellite on the high energy side of the current resonance in the I(V) characteristic. A theoretical model based on the many-body transfer Hamiltonian formalism shows that a plasmon excitation has remarkably similar structure. Magnetic field data support the plasmon satellite interpretation.
Performance Of Embankment Stabilized With Vertical Drains On Soft Clay, Buddhima Indraratna, A. S. Balasubramaniam, P. Ratnayake
Performance Of Embankment Stabilized With Vertical Drains On Soft Clay, Buddhima Indraratna, A. S. Balasubramaniam, P. Ratnayake
Faculty of Engineering - Papers (Archive)
This study describes the performance of a fldl-scale embankment raised on a soft marine clay, stabilized with vertical band drains in Malaysia. The finite element code CRISP, which is based on critical-state soil mechanics, has been employed to investigate the performance of the embankment and the underlying soft clay. Predictions of the excess pore pressures and both vertical and lateral displacements are made and compared with field observations. The limited use of closed-form solutions for the prediction of settlements at the line of symmetry of the embankment is also discussed. The effectiveness of the prefabricated drains has been evaluated according …
Electron Correlations In A Double-Quantum-Well Structure, C. Zhang
Electron Correlations In A Double-Quantum-Well Structure, C. Zhang
Faculty of Engineering - Papers (Archive)
The electron correlation effect in a double-quantum-well structure is investigated. The local-field correction and static structural factors are calculated for these structures. It is found that the static structural factors show an anomalous behavior at small q due to the coupled quantum-well-plasma excitation and the interlayer structural factor is negative at large q. We also found that the long-wavelength acoustic plasma mode is further softened due to short-range electron correlations. The minimum critical well separation for this mode to exist increases by an amount ∼1/kf1, where kf1 is the Fermi wave vector of the well with higher electron concentration.
Magnetoresistance And V-I Curves Of Ag-Sheathed (Bi,Pb)2sr2ca2cu3o10+Y Tape, E. Babic, I. Kusevic, S X. Dou, Hua-Kun Liu, Q. Y. Hu
Magnetoresistance And V-I Curves Of Ag-Sheathed (Bi,Pb)2sr2ca2cu3o10+Y Tape, E. Babic, I. Kusevic, S X. Dou, Hua-Kun Liu, Q. Y. Hu
Faculty of Engineering - Papers (Archive)
The magnetoresistance and the V-I curves (I>Ic) of a well-characterized Ag-clad (Bi,Pb)2Sr2Ca2Cu3O10+y tape (BPSCCO) with Jc(77 K, B=0)=10 kA/cm2 have been analyzed in the temperature (T) range 80–110 K and magnetic field (B) up to 60 mT. The results obtained after the correction for the parallel conduction through the Ag sheathing and BPSCCO core are similar to those for corresponding single crystals and the epitaxial thin films. The effective activation energy for the flux creep U0 is larger than those for the single crystals and thin films of Bi-Sr-Ca-Cu-O (BSCCO) compound. The variations of the differential resistance Rf (deduced …
The Interpretation Of Laser Sensing Measurements For Blast Furnace Operations And Control, Peter C. Wall, R J Turner, Mark Hughes, Peter Huk, Ross J. Haywood, M J Mccarthy, Paul Zulli
The Interpretation Of Laser Sensing Measurements For Blast Furnace Operations And Control, Peter C. Wall, R J Turner, Mark Hughes, Peter Huk, Ross J. Haywood, M J Mccarthy, Paul Zulli
Faculty of Engineering and Information Sciences - Papers: Part A
Several laser-based sensors for use on blast furnaces have been developed and implemented, including a raceway sensor, burden level sensor (single point) and burden surface profiler. These sensors are based on the time-of-flight technique and give high levels of accuracy in all applications. The data obtained from the sensors during normal furnace operations are examined in light of the process models utilised by operators and for the interpretation of pulverised coal injection performance. Raceway sensory data obtained during a furnace blow-in are also discussed.
Low Temperature Synthesis Of Al-Aln Composites From A Nanostructure Made By Controlled Magneto-Ball Milling Of Al In Ammonia, Andrzej Calka, J I. Nikolov, G H. J Wantenaar
Low Temperature Synthesis Of Al-Aln Composites From A Nanostructure Made By Controlled Magneto-Ball Milling Of Al In Ammonia, Andrzej Calka, J I. Nikolov, G H. J Wantenaar
Faculty of Engineering and Information Sciences - Papers: Part A
The formation of an AlN compound in ball milled Al powder in ammonia was studied. In this work a magneto‐ball milling device with controlled ball movement was used. The end milling product was an Al based nanostructure. This product can be transformed into an AlN‐Al nanocomposite upon heating below the melting point of Al. It was found that the level of unreacted Al is dependent on milling time. The maximum amount of AlN was 88.28 wt %. The structure of as‐milled and annealed samples was investigated using x‐ray diffractometry and transmission electron microscopy. Differential thermal analysis was performed on as‐milled …
New Solutions For The Propagation Of Long Water Waves Over Variable Depth, Yinglong Zhang, Song-Ping Zhu
New Solutions For The Propagation Of Long Water Waves Over Variable Depth, Yinglong Zhang, Song-Ping Zhu
Faculty of Engineering and Information Sciences - Papers: Part A
Based on the linearized long-wave equation, two new analytical solutions are obtained respectively for the propagation of long surface gravity waves around a conical island and over a paraboloidal shoal. Having been intensively studied during the last two decades, these two problems have practical significance and are physically revealing for wave propagation over variable water depth. The newly derived analytical solutions are compared with several previously obtained numerical solutions and the accuracy of those numerical solutions is discussed. The analytical method has the potential to be used to find solutions for wave propagation over more natural bottom topographies.
Crossed Products By Semigroups Of Endomorphisms And The Toeplitz Algebras Of Ordered Groups, Sriwulan Adji, Marcelo Laca, May Nilsen, Iain Raeburn
Crossed Products By Semigroups Of Endomorphisms And The Toeplitz Algebras Of Ordered Groups, Sriwulan Adji, Marcelo Laca, May Nilsen, Iain Raeburn
Faculty of Engineering and Information Sciences - Papers: Part A
No abstract provided.
A Three-Dimensional Numerical Model Of The Response Of The Australian North West Shelf To Tropical Cyclones, Song-Ping Zhu, Jorg Imberger
A Three-Dimensional Numerical Model Of The Response Of The Australian North West Shelf To Tropical Cyclones, Song-Ping Zhu, Jorg Imberger
Faculty of Engineering and Information Sciences - Papers: Part A
A three-dimensional barotropic and baroclinic model is developed to simulate currents and temperature changes induced by tropical cyclones traversing the continental shelf and slope region of the Australian North West Shelf. The model is based on a layered, explicit, finite difference formulation using the nonlinear primitive equations with an embedded entrainment scheme; a mixed-surface-layer interface is defined, which is allowed to shift from one interface to another, depending on the strength of a storm. The model has been tested by simulating the currents and temperature changes induced by tropical cyclones Orson and Ian. The modelled currents and temperatures agreed well …
Classical Versions Of Bci, Bck And Bciw Logics, Martin W. Bunder, John K. Slaney
Classical Versions Of Bci, Bck And Bciw Logics, Martin W. Bunder, John K. Slaney
Faculty of Engineering and Information Sciences - Papers: Part A
The question is, is there a formula X, independent of B,C,K1, I and W that creates distinct subclassical logics BCIX,BCKX and BCIWX, while BCKWX is the full classical implicational logic TV?
The Strong Relevance Logics, Martin W. Bunder
The Strong Relevance Logics, Martin W. Bunder
Faculty of Engineering and Information Sciences - Papers: Part A
The tautology p - q - p is not a theorem of the various relevance logics (see Anderson and Belnap [1]) because q is not considered to be relevant in the derivation of final p. We can take this lack of relevance to mean simply that p-q-p could have been proved without q and its -, i.e., p-p. By the same criterion we could say that in ((p-p) -q) -q p-p is not relevant. In general we will say that any theorem A of an implicational logic is strongly relevant if there is no subpart B ! which can be …
Occurrence Of Shiga-Like Toxin-Producing Escherichia Coli In Retail Fresh Seafood, Beef, Lamb, Pork, And Poultry From Grocery Stores In Seattle, Washington, Mansour Samadpour, Jerry Ongerth, J. Liston, Nhiem Tran, Dong Nguyen, Thomas S. Whittam, Richard Wilson, Phillip I. Tarr
Occurrence Of Shiga-Like Toxin-Producing Escherichia Coli In Retail Fresh Seafood, Beef, Lamb, Pork, And Poultry From Grocery Stores In Seattle, Washington, Mansour Samadpour, Jerry Ongerth, J. Liston, Nhiem Tran, Dong Nguyen, Thomas S. Whittam, Richard Wilson, Phillip I. Tarr
Faculty of Engineering and Information Sciences - Papers: Part A
Fresh meat, poultry, and seafood purchased from Seattle area grocery stores were investigated for the presence of Shiga-like toxin-producing Escherichia coli by using DNA probes for Shiga-like toxin (SLT) genes I and II. Of the 294 food samples tested, 17% had colonies with sequence homology to SLT I and/or SLT II genes.
Competition For Herbage By Phaulacridium Vittatum (Sjostedt) (Orthoptera:Acrididae) And Sheep During Summer Drought, P Bailey, A B. Frensham, A Hincks, M Newton
Competition For Herbage By Phaulacridium Vittatum (Sjostedt) (Orthoptera:Acrididae) And Sheep During Summer Drought, P Bailey, A B. Frensham, A Hincks, M Newton
Faculty of Engineering and Information Sciences - Papers: Part A
No abstract provided.
Intergranular And Intragranular Critical Currents In Silver-Sheathed Pb-Bi-Sr-Ca-Cu-O Tapes, K. Muller, C. Andrikidis, Hua-Kun Liu, S. X. Dou
Intergranular And Intragranular Critical Currents In Silver-Sheathed Pb-Bi-Sr-Ca-Cu-O Tapes, K. Muller, C. Andrikidis, Hua-Kun Liu, S. X. Dou
Faculty of Engineering - Papers (Archive)
The role of the intergranular and intragranular critical current densities in silver-sheathed Pb-Bi-Sr-Ca-Cu-O tapes is investigated by means of magnetic-moment measurements in perpendicular field at different temperatures using a superconducting quantum interference device magnetometer. We find that low-field magnetic-moment loops are mainly caused by the intergranular (transport) critical current density JcJ but that in high fields the contribution from the intragranular critical current density JcG becomes significant. The low-field data can be described well in terms of a critical-state model for a thin strip of a homogeneous type-II superconductor in a perpendicular field where JcJ flows over the entire tape. …
Case History Analysis Of Mine Water Pollution In New South Wales, Muttucumaru Sivakumar, S Morton, Raghu N. Singh
Case History Analysis Of Mine Water Pollution In New South Wales, Muttucumaru Sivakumar, S Morton, Raghu N. Singh
Faculty of Engineering - Papers (Archive)
In this paper, problems associated with mine waste water discharge quality in two mines are examined in the environmentally sensitive regions in NSW, Australia. In the first mine the problem of controlling and treating surface run-off from a large coal mine site is duscussed. Then study involved sampling and analysis of mine wastewater during various weather conditions over a period of six months. The samples were analysed for a range of physical and chemical water quality parameters. The study indicated that during minor storms, the mine wastewater treatment system worked effectively, but during a moderate to major storm, the treatment …
Near-Distance Software Engineering Education, F. O'Brien
Near-Distance Software Engineering Education, F. O'Brien
Faculty of Informatics - Papers (Archive)
The University of Wollongong has been seeking ways by which it can attract capable students from the southern side of the States capital city, Sydney, Australia. The paper describes the concept of limiting the required daily travel to the University through an amalgam of technologies, and changes to the core teaching syllabus. Progress through 1994, and plans for full introduction in 1995, is described.