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Articles 2881 - 2910 of 2936
Full-Text Articles in Social and Behavioral Sciences
Geotechnical Assessment And Management Of 148 Landslides Triggered By A Major Storm Event In Wollongong, Australia, P N. Flentje, R N. Chowdhury
Geotechnical Assessment And Management Of 148 Landslides Triggered By A Major Storm Event In Wollongong, Australia, P N. Flentje, R N. Chowdhury
Faculty of Engineering and Information Sciences - Papers: Part A
On the 17th August 1998 a severe rainfall event occurred over a widespread area of the City of Wollongong. During this storm, 1 person drowned and an estimated $50 to $100 million damage was caused to the City of Wollongong. Road access to the City was cut by raised water levels and debris flows covering and or scouring road and rail routes for up to 36 hours following this event. A geotechnical team of 3, including the first author, was organised at very short notice during the response phase of the emergency operations on the early morning of the 20th …
The Toeplitz Algebra Of A Hilbert Bimodule, Neal J. Fowler, Iain Raeburn
The Toeplitz Algebra Of A Hilbert Bimodule, Neal J. Fowler, Iain Raeburn
Faculty of Engineering and Information Sciences - Papers: Part A
Suppose a C ∗ -algebra A acts by adjointable operators on a Hilbert A -module X. Pimsner constructed a C ∗ -algebra 𝒪 X which includes, for particular choices of X , crossed products of A by Z , the Cuntz algebras 𝒪 n , and the CuntzKrieger algebras 𝒪 B. Here we analyse the representations of the corresponding Toeplitz algebra. One consequence is a uniqueness theorem for the ToeplitzCuntz-Krieger algebras of directed graphs, which includes Cuntz’s uniqueness theorem for 𝒪 ∞.
Optimization Of Soliton Amplitude In Dispersion-Decreasing Nonlinear Optical Fibres, Ken I M Mckinnon, Noel Smyth, Annette L. Worthy
Optimization Of Soliton Amplitude In Dispersion-Decreasing Nonlinear Optical Fibres, Ken I M Mckinnon, Noel Smyth, Annette L. Worthy
Faculty of Engineering and Information Sciences - Papers: Part A
The compression of a cw into a periodic train of noninteracting solitons by a dispersion-decreasing fiber is investigated with a variational method. To model the evolution from the cw to the soliton train, an elliptic-function-based expression is used as the trial function in the averaged Lagrangian. Both a continuous dispersion variation and a step dispersion variation in the fiber are considered. By use of an optimization method based on the approximate variational equations, the optimal dispersion profile required for achieving maximum pulse compression in a fixed length of fiber is determined. The solutions of the approximate equations are compared with …
Lie Algebras Of Cohomological Codimension One, Grant F. Armstrong, Grant Cairns, Gunky Kim
Lie Algebras Of Cohomological Codimension One, Grant F. Armstrong, Grant Cairns, Gunky Kim
Faculty of Engineering and Information Sciences - Papers: Part A
We show that if g is a finite dimensional real Lie algebra, then g has cohomological dimension cd(g) = dim(g) - 1 if and only if g is a unimodular extension of the two-dimensional non-Abelian Lie algebra aff.
An Index Theorem For Toeplitz Operators On Totally Ordered Groups, Sriwulan Adji, Iain Raeburn, Anton Stroh
An Index Theorem For Toeplitz Operators On Totally Ordered Groups, Sriwulan Adji, Iain Raeburn, Anton Stroh
Faculty of Engineering and Information Sciences - Papers: Part A
No abstract provided.
Coal Mine Rib Mechanics - An Improved Understanding Of Rib Behaviour And Support Requirements, B Hebblewhite, B Lin, J Galvin, R Walker, Justine D. Calleja
Coal Mine Rib Mechanics - An Improved Understanding Of Rib Behaviour And Support Requirements, B Hebblewhite, B Lin, J Galvin, R Walker, Justine D. Calleja
Faculty of Engineering and Information Sciences - Papers: Part A
The role of reinforcement elements in coal mine ribs has not been well understood. Various approaches to rib support and reinforcement are in use in the industry with mixed results. Rib spall is not uncommon and can vary from small nuisance fragments of coal to large scale collapse of the full rib surface, often with serious safety implications. This paper describes the outcomes of an ACARP research project which investigated rib behaviour to identify the geotechnical mechanics involved and then evaluated some prototype reinforcement strategies based on the concept of yielding support elements.
Completeness Of The Propositions-As-Types Interpretation Of Intuitionistic Logic Into Illative Combinatory Logic, Wil Dekkers, Martin Bunder, Henk Barendregt
Completeness Of The Propositions-As-Types Interpretation Of Intuitionistic Logic Into Illative Combinatory Logic, Wil Dekkers, Martin Bunder, Henk Barendregt
Faculty of Engineering and Information Sciences - Papers: Part A
Illative combinatory logic consists of the theory of combinators or lambda calculus extended by extra constants (and corresponding axioms and rules) intended to capture inference. In a preceding paper, [2], we considered 4 systems of illative combinatory logic that are sound for first order intuitionistic prepositional and predicate logic. The interpretation from ordinary logic into the illative systems can be done in two ways: following the propositions-as-types paradigm, in which derivations become combinators, or in a more direct way, in which derivations are not translated. Both translations are closely related in a canonical way. In the cited paper we proved …
Cancellation Laws For Bci-Algebra, Atoms And P-Semisimple Bci-Algebras, M W. Bunder
Cancellation Laws For Bci-Algebra, Atoms And P-Semisimple Bci-Algebras, M W. Bunder
Faculty of Engineering and Information Sciences - Papers: Part A
We derive cancellation laws for BCI-algebras and for p-semisimple BCI- algebras, show that the set of all atoms of a BCI-algebra is a p semisimple BCI-algebra and that in a p-semisimple BCI-algebra and = are the same.
Completeness Of Two Systems Of Illative Combinatory Logic For First-Order Propositional And Predicate Calculus, Wil Dekkers, Martin Bunder, Henk Barendregt
Completeness Of Two Systems Of Illative Combinatory Logic For First-Order Propositional And Predicate Calculus, Wil Dekkers, Martin Bunder, Henk Barendregt
Faculty of Engineering and Information Sciences - Papers: Part A
Illative combinatory logic consists of the theory of combinators or lambda calculus extended by extra constants (and corresponding axioms and rules) intended to capture inference. The paper considers 4 systems of illative combinatory logic that are sound for first-order propositional and predicate calculus.
A Landslide Database For Landslide Hazard Assessment, Robin N. Chowdhury, Phillip N. Flentje
A Landslide Database For Landslide Hazard Assessment, Robin N. Chowdhury, Phillip N. Flentje
Faculty of Engineering and Information Sciences - Papers: Part A
Assessing the hazard and risk of slope instability and landsliding requires a consideration of basic geological and geotechnical factors which control stability as well as external agents or events which decrease stability and which may trigger landsliding. Prediction of slope performance is difficult and it is, therefore, considered appropriate to develop approaches for hazard and risk assessment. This paper is concerned primarily with one important aspect or element of such an approach. The essential and desirable features of a landslide database are outlined with particular reference to an urban area in New South Wales, Australia. The procedures and processes for …
Effective Urban Landslide Hazard Assessment, Robin N. Chowdhury, Phillip N. Flentje
Effective Urban Landslide Hazard Assessment, Robin N. Chowdhury, Phillip N. Flentje
Faculty of Engineering and Information Sciences - Papers: Part A
Landslide hazard assessment is a vitally important component of any strategy for the management of risk of instability in hilly areas. Within many urban areas, reactivation of landslides is an important component of risk. Yet, most qualitative approaches do not differentiate between the hazard of individual landslides. Two quantitative approaches are introduced in this paper both of which utilise GISbased accurate maps of geology and landslip as well as a landslide database. The first method is based on historical recurrence of individual landslides. The second method is based on monitoring of subsurface shear movements, and their relationships to rainfall. Both …
Neural Network Classification And Prior Class Probabilities, Steve Lawrence, Ian Burns, Andrew Back, Ah Chung Tsoi, C Lee Giles
Neural Network Classification And Prior Class Probabilities, Steve Lawrence, Ian Burns, Andrew Back, Ah Chung Tsoi, C Lee Giles
Faculty of Engineering and Information Sciences - Papers: Part A
A commonly encountered problem in MLP (multi-layer perceptron) classification problems is related to the prior probabilities of the individual classes - if the number of training examples that correspond to each class varies significantly between the classes, then it may be harder for the network to learn the rarer classes in some cases. Such practical experience does not match theoretical results which show that MLPs approximate Bayesian a posteriori probabilities (independent of the prior class probabilities). Our investigation of the problem shows that the difference between the theoretical and practical results lies with the assumptions made in the theory (accurate …
De Filtration To Remove Cryptosporidium, Jerry E. Ongerth, Primrose E. Hutton
De Filtration To Remove Cryptosporidium, Jerry E. Ongerth, Primrose E. Hutton
Faculty of Engineering and Information Sciences - Papers: Part A
Laboratory-scale testing investigated the degree of Cryptosporidium oocyst reduction provided by diatomaceous earth (DE) filtration. Three grades of DE from two manufacturers were used in the tests. Reduction was measured using seeded river water applied to Walton test filters. Tests were run for filtration rates of 1 and 2 gpm/sq ft (2.4 and 4.9 m/h). Each run was replicated three times, and quality control was rigorous. Approximately 6 logs of reduction in the concentration of Cryptosporidium oocysts can be expected under routine operating conditions using DE grades having permeability of <1.2 Darcy. Log reductions varied predictably according to the permeability of the DE grade and the filtration rate; they were significantly higher at the higher filtration rate. Agreement was excellent between runs, enabling researchers to distinguish with consistent statistical significance the differences in performance.
Risk Assessment Of Sloping Land Using Gis-Based Mapping, Phil N. Flentje, Robin N. Chowdhury
Risk Assessment Of Sloping Land Using Gis-Based Mapping, Phil N. Flentje, Robin N. Chowdhury
Faculty of Engineering and Information Sciences - Papers: Part A
In this paper, attention is drawn to GIS-based techniques for mapping and risk assessment for slopes and landslides. The authors focus on an approach developed recently for mapping of geology and slope stability in the Northern Illawarra (or the Northern Suburbs of Greater Wollongong Area) in New South Wales, Australia. The use of databases of geology and land instability and use of other GIS-based information relevant to sloping land for the development of a valid hazard and risk assessment procedure is explored. The developed approach will be applicable to other sloping areas and, in particular, urban areas both nationally and …
The Impact Of Ios-Enabled Business Process Change On Business Outcomes: Transformation Of The Value Chain Of Japan Airlines, Akemi Chatfield, Niels Bjorn-Andersen
The Impact Of Ios-Enabled Business Process Change On Business Outcomes: Transformation Of The Value Chain Of Japan Airlines, Akemi Chatfield, Niels Bjorn-Andersen
Faculty of Engineering and Information Sciences - Papers: Part A
We present a framework for evaluating the impact of IT-enabled radical process change on business outcomes at Japan Airlines. The framework presents a systemic view of factors that are shown to impact the firm's business outcomes. The framework identifies salient global environmental factors and business challenges the firm faces, strategic responses it makes, and management methodologies and strategic IT systems adopted to enable the firm's changes in business processes. We then discuss the radical transformation of the traditional keiretsu-based value chain at Japan Airlines, the world's third largest airline company. We apply the framework to evaluate the impact of the …
Preparation And Validation Of Digital Maps Of Geology And Slope Instability, P N. Flentje, R N. Chowdhury
Preparation And Validation Of Digital Maps Of Geology And Slope Instability, P N. Flentje, R N. Chowdhury
Faculty of Engineering and Information Sciences - Papers: Part A
This paper is concerned with a description of the techniques for the development of digital maps of geology and slope instability. The validation of such maps by field inspection and checking is highlighted. These techniques have been used successfully for the suburbs of the northern Wollongong region of New South Wales. Such maps allow the flexibility of future modifications as additional and or more reliable data becomes available. These maps will facilitate decisions on the planning and management of land use. Currently, 295 cases of land instability have been documented within the study area. The maps are also expected to …
Precursory Localization And Development Of Microfractures Along The Ultimate Fracture Plane In Amphibolite Under Triaxial Creep, Takashi Satoh, Shivakumar Karekal, Osamu Nishizawa, K Kusunose
Precursory Localization And Development Of Microfractures Along The Ultimate Fracture Plane In Amphibolite Under Triaxial Creep, Takashi Satoh, Shivakumar Karekal, Osamu Nishizawa, K Kusunose
Faculty of Engineering and Information Sciences - Papers: Part A
In a triaxial creep experiment in amphibolite, we clearly found a precursorylo calizationa nd developmento f microfracturesa long the final fracture planeu singa n AE (acoustice missions) ourcelo cation technique.T he precursorylo calizationo f AE hypocenters first nucleatedn ear a pre-existingm acroscopidc efecta ndt hene xtendedg raduallya longt hef inalf racture plane prior to failure. On the other hand, no significant precursorylo calizationo f AE hypocenteros n the final fracture plane before failure has been reported in rock samplesf ree of pre-existingm acroscopidce fects. This differencein AE occurrencep atterns beforef ailure could be explainedb y the differencein the degreeo f …
Geological And Land Instability Mapping Using A Gis Package As A Building Block For The Development Of A Risk Assessment Procedure, R N. Chowdhury, P N. Flentje
Geological And Land Instability Mapping Using A Gis Package As A Building Block For The Development Of A Risk Assessment Procedure, R N. Chowdhury, P N. Flentje
Faculty of Engineering and Information Sciences - Papers: Part A
A modern land instability risk assessment procedure must include an accurate geological framework and land instability database. Geological and land instability mapping of the northern suburbs of the City of Wollongong represents a considerable challenge and is to be achieved using computer generated 1:4000 topographic base maps. Using an integrated series of techniques, including computer modelling of the escarpment geology and field mapping techniques, a new series of geological maps has been produced. Meanwhile an exhaustive land instability database of the region has been compiled. A flexible approach to mapping and data compilation is very useful and confirms the viability …
The Equivariant Bauer Groups Of Commuting Free And Proper Actions Are Isomorphic, Alexander Kumjian, Iain Raeburn, Dana P. Williams
The Equivariant Bauer Groups Of Commuting Free And Proper Actions Are Isomorphic, Alexander Kumjian, Iain Raeburn, Dana P. Williams
Faculty of Engineering and Information Sciences - Papers: Part A
No abstract provided.
Far-Infrared Measurements Of Cyclotron Resonance And Impurity Transitions In Bulk N-Gaas In Pulsed Magnetic Fields, R A. Lewis, R J. Heron, R G. Clark, R P. Starrett, A V. Skougarevsky
Far-Infrared Measurements Of Cyclotron Resonance And Impurity Transitions In Bulk N-Gaas In Pulsed Magnetic Fields, R A. Lewis, R J. Heron, R G. Clark, R P. Starrett, A V. Skougarevsky
Faculty of Engineering and Information Sciences - Papers: Part A
The photoconductive response of n-GaAs has been measured under laser radiation in the wavelength range 71 to 513 /spl mu/m at temperatures as low as 400 mK and at magnetic fields as high as 42 T. A rich variety of spectral features are observed: cyclotron resonance, transitions associated with D/sup -/, and transitions to stable and metastable hydrogenic states. The use of a pulsed magnet has extended the magnetic field range over which data is available by a factor of three.
Comparison Of Two Methods For Detection Of Cryptosporidium & Giardia In Water, Eva C. Nieminski, Frank W. Schaefer Iii, Jerry E. Ongerth
Comparison Of Two Methods For Detection Of Cryptosporidium & Giardia In Water, Eva C. Nieminski, Frank W. Schaefer Iii, Jerry E. Ongerth
Faculty of Engineering and Information Sciences - Papers: Part A
The steps of two immunofluorescent-antibody-based detection methods were evaluated for their efficiencies in detecting Giardia cysts and Cryptosporidium oocysts. The two methods evaluated were the American Society for Testing and Materials proposed test method for Giardia cysts and Cryptosporidium oocysts in low-turbidity water and a procedure employing sampling by membrane filtration, Percoll-Percoll step gradient, and immunofluorescent staining. The membrane filter sampling method was characterized by higher recovery rates in all three types of waters tested: raw surface water, partially treated water from a flocculation basin, and filtered water. Cyst and oocyst recovery efficiencies decreased with increasing water turbidity regardless of …
Molecular Epidemiology Of A Fast-Food Restaurant-Associated Outbreak Of Escherichia Coli O157:H7 In Washington State, Linda M. Grimm, Marcia Goldoft, John Kobayashi, Jay H. Lewis, Dalia Alfi, Ann Marie Perdichizzi, Phillip I. Tarr, Jerry E. Ongerth, Steve L. Moseley, Mansour Samadpour
Molecular Epidemiology Of A Fast-Food Restaurant-Associated Outbreak Of Escherichia Coli O157:H7 In Washington State, Linda M. Grimm, Marcia Goldoft, John Kobayashi, Jay H. Lewis, Dalia Alfi, Ann Marie Perdichizzi, Phillip I. Tarr, Jerry E. Ongerth, Steve L. Moseley, Mansour Samadpour
Faculty of Engineering and Information Sciences - Papers: Part A
We studied the molecular epidemiology of the recent fast-food restaurant chain-associated Escherichia coli O157:H7 outbreak in Washington State. Genomic DNAs prepared from strains isolated from 433 patients were probed with radiolabelled Shiga-like toxin (SLT) I and SLT II genes and bacteriophage l DNA and were subsequently analyzed for their restriction fragment length polymorphism (RFLP) patterns. The SLT RFLP and l RFLP profiles of an E. coli O157:H7 strain isolated from the incriminated beef and prototype patient were compared with those of the patient isolates for determination of the concordance between patterns. Of the 377 patients with primary and secondary cases …
Mine Boundary Detection Using Markov Random Field Models, Xia Hua, Jennifer L. Davidson, Noel A. Cressie
Mine Boundary Detection Using Markov Random Field Models, Xia Hua, Jennifer L. Davidson, Noel A. Cressie
Faculty of Engineering and Information Sciences - Papers: Part A
Detection of objects in images in an automated fashion is necessary for many applications, including automated target recognition. In this paper, we present results of boundary detection using Markov random fields. Once the boundaries of regions are detected, object recognition can be conducted to classify the regions within the boundaries. Thus, an approach that gives good boundary detection is very important in many automated target recognition systems. Our algorithm for boundary detection combines a Bayesian approach with a histogram specification technique to locate edges of objects that have a closed-loop boundary. The boundary image is modeled by a Markov random …
The Formation Of Ternary Compound Fe3mo3c By Ball Milling, L M. Di, Andrzej Calka, Z L. Li, J S. Williams
The Formation Of Ternary Compound Fe3mo3c By Ball Milling, L M. Di, Andrzej Calka, Z L. Li, J S. Williams
Faculty of Engineering and Information Sciences - Papers: Part A
Ball milling of Mo in nitrogen and ammonia gases has been studied. After heating, the formation of an intriguing ternary compound, Fe3Mo3C1−x , was observed as a result of Fe (and C) contamination from the milling apparatus. For a comparison, mechanical alloying of Fe–Mo–C powders with a stoichiometric composition of Fe3Mo3C was also performed and again an Fe–Mo–C alloy was obtained after milling.Thermal analysis shows a single transition peak for the formation of both the Fe3Mo3C phase in the latter case and also for Fe3 …
A Simplified Form Of Condensed Detachment, M W. Bunder
A Simplified Form Of Condensed Detachment, M W. Bunder
Faculty of Engineering and Information Sciences - Papers: Part A
This paper gives a simple, elegant statement of the condensed detachment rule that is independent of most general unifiers and proves that this is equivalent to the longer, more usual, formulation.
Induced C*-Algebras And Landstad Duality For Twisted Coactions, John C. Quigg, Iain Raeburn
Induced C*-Algebras And Landstad Duality For Twisted Coactions, John C. Quigg, Iain Raeburn
Faculty of Engineering and Information Sciences - Papers: Part A
No abstract provided.
Extending Multipliers From Semigroups, Marcelo Laca, Iain Raeburn
Extending Multipliers From Semigroups, Marcelo Laca, Iain Raeburn
Faculty of Engineering and Information Sciences - Papers: Part A
A multiplier on a normal subsemigroup of a group can be extended to a multiplier on the group. This is used to show that normal cancellative semigroups have the same second cohomology as the group they generate, generalising earlier results of Arveson, Chernoff, and Dinh. The main tool is a dilation theorem for isometric multiplier representations of semigroups.
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.