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2006

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Articles 8491 - 8520 of 10745

Full-Text Articles in Social and Behavioral Sciences

Landscape Variability And The Response Of Asian Megadeltas To Environmental Change, Colin D. Woodroffe, Robert J. Nicholls, Yoshiki Saito, Zhongyuan Chen, S L. Goodbred Jan 2006

Landscape Variability And The Response Of Asian Megadeltas To Environmental Change, Colin D. Woodroffe, Robert J. Nicholls, Yoshiki Saito, Zhongyuan Chen, S L. Goodbred

Faculty of Science - Papers (Archive)

Deltas, occurring at the mouths of river systems that deposit sediments as they enter the sea, are some of the most dynamic sedimentary environments. They contain a long, and often economically significant, sedimentary record of their response to past episodes of climate and sea-level change. Geological investigation of these deposits, and the processes controlling sedimentation, provide insights into the response of deltas to environmental change, which in turn may offer rational and cost-effective strategies for the sustainable management of natural resources and land use in these dynamic systems in the face of future environmental change.

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Cyclicity In The Nearshore Marine To Coastal, Lower Permian, Pebbley Beach Formation, Southern Sydney Basin, Australia: A Record Of Relative Sea-Level Fluctuations At The Close Of The Late Palaeozoic Gondwanan Ice Age, Brian G. Jones, Stuart C. Tye, James A. Maceachern, Kerrie L. Bann, Christopher R. Fielding Jan 2006

Cyclicity In The Nearshore Marine To Coastal, Lower Permian, Pebbley Beach Formation, Southern Sydney Basin, Australia: A Record Of Relative Sea-Level Fluctuations At The Close Of The Late Palaeozoic Gondwanan Ice Age, Brian G. Jones, Stuart C. Tye, James A. Maceachern, Kerrie L. Bann, Christopher R. Fielding

Faculty of Science - Papers (Archive)

The Lower Permian (Artinskian to Sakmarian) Pebbley Beach Formation of the southernmost Sydney Basin in New South Wales, Australia, records sediment accumulation in shallow marine to coastal environments at the close of the Late Palaeozoic Gondwanan ice age. This paper presents a sequence stratigraphic re-evaluation of the upper half of the unit based on the integration of sedimentology and ichnology. Ten facies are recognized, separated into two facies associations. Facies Association A (7 facies) comprises variably bioturbated siltstones and sandstones with marine body fossils, interpreted to record sediment accumulation in open marine environments ranging from lower offshore to middle shoreface …

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Recruitment Failure And Shifts In Community Structure Following Mass Mortality Limit Recovery Prospects Of Black Abalone, C. Melissa Miner, Jessica M. Altstatt, Peter T. Raimondi, Todd E. Minchinton Jan 2006

Recruitment Failure And Shifts In Community Structure Following Mass Mortality Limit Recovery Prospects Of Black Abalone, C. Melissa Miner, Jessica M. Altstatt, Peter T. Raimondi, Todd E. Minchinton

Faculty of Science - Papers (Archive)

Mass mortalities of species can fundamentally alter the structure of natural communities, which can in turn negatively impact species’ recovery. Beginning in 1994, some of the largest remaining populations of black abaloneHaliotis cracherodii on the mainland coast of California, experienced mass mortalities due to the fatal disease called ‘withering syndrome’, which led to its listing as a species of concern by the USA National Marine Fisheries Service. We have been monitoring black abalone populations along the coast of southern and central California since 1992, and detection of withering syndrome at our southernmost site prompted us to investigate how the …

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New Applications Of Modulated Digital Images In Document Security, Robert A. Lee, Patrick W. Leech, Lawrey D. Mccarthy, Gerhard F. Swiegers Jan 2006

New Applications Of Modulated Digital Images In Document Security, Robert A. Lee, Patrick W. Leech, Lawrey D. Mccarthy, Gerhard F. Swiegers

Faculty of Science - Papers (Archive)

In previous work we have demonstrated that selective masking, or modulation, of digital images can be used to create documents and transparent media containing covert or optically variable, overt images. In the present work we describe new applications and techniques of such "modulated digital images" (MDI's) in document security. In particular, we demonstrate that multiple hidden images can be imperceptibly concealed within visible, host images by incorporating them as a new, half-tone, printing screen. Half-toned hidden images of this type may contain a variety of novel features that hinder unauthorized copying, including concealed multiple images, and microprinted-, color-, and various …

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Helicase-Binding To Dnai Exposes A Cryptic Dna-Binding Site During Helicase Loading In Bacillus Subtilis, Charikleia Ioannou, Patrick M. Schaeffer, Nicholas E. Dixon, Panos Soultanas Jan 2006

Helicase-Binding To Dnai Exposes A Cryptic Dna-Binding Site During Helicase Loading In Bacillus Subtilis, Charikleia Ioannou, Patrick M. Schaeffer, Nicholas E. Dixon, Panos Soultanas

Faculty of Science - Papers (Archive)

The Bacillus subtilis DnaI, DnaB and DnaD proteins load the replicative ring helicase DnaC onto DNA during priming of DNA replication. Here we show that DnaI consists of a C-terminal domain (Cd) with ATPase and DNA-binding activities and an N-terminal domain (Nd) that interacts with the replicative ring helicase. A Zn21-binding module mediates the interaction with the helicase and C67, C70 and H84 are involved in the coordination of the Zn21. DnaI binds ATP and exhibits ATPase activity that is not stimulated by ssDNA, because the DNAbinding site on Cd is masked by Nd. The ATPase activity resides on the …

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Observations Of A Propagating Vortex In A Tidal Current, J B. Hinwood, E. J. Mclean, O. Gould Jan 2006

Observations Of A Propagating Vortex In A Tidal Current, J B. Hinwood, E. J. Mclean, O. Gould

Faculty of Science - Papers (Archive)

While observing the hydrodynamics and geomorphology of the entrance to Burrill Lake, a small estuary on the south coast of New South Wales, Australia, a striking vortex phenomenon was observed. This vortex is described and interpreted.

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Structure And Dynamics Of Sponge-Dominated Assemblages On Exposed And Sheltered Temperate Reefs, D. E. Roberts, S. P. Cummins, A. R. Davis, M. G. Chapman Jan 2006

Structure And Dynamics Of Sponge-Dominated Assemblages On Exposed And Sheltered Temperate Reefs, D. E. Roberts, S. P. Cummins, A. R. Davis, M. G. Chapman

Faculty of Science - Papers (Archive)

There have been few studies on the structure and dynamics of sponge-dominated assemblages, despite the fact that such assemblages are vulnerable to environmental impacts from many anthropogenic disturbances. Sponges are generally slow to recruit, slow growing and long lived; hence, they may be very vulnerable to anthropogenic and natural disturbances. In order to understand how such assemblages may respond to disturbance, it is essential to measure natural patterns of spatial differences and temporal changes, so that any future impact assessments can be identified. This study quantified and contrasted patterns of abundance in sponge-dominated assemblages on deep reefs (18 to 20 …

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The Geomorphological Evolution Of A Wave-Dominated Barrier Estuary: Burrill Lake, New South Wales, Australia, Brian G. Jones, Craig R. Sloss, David M. Price, C.E. Mcclennen, John De Carli Jan 2006

The Geomorphological Evolution Of A Wave-Dominated Barrier Estuary: Burrill Lake, New South Wales, Australia, Brian G. Jones, Craig R. Sloss, David M. Price, C.E. Mcclennen, John De Carli

Faculty of Science - Papers (Archive)

The geomorphological evolution of the Holocene wave-dominated barrier estuary at Burrill Lake on the New South Wales coast, Australia, has been delineated using a combination of seismic stratigraphy and the lithostratigraphic analysis of vibracores collected from the back-barrier estuarine environment. A combination of radiocarbon and aspartic acid racemisation-derived ages obtained on Holocene fossil molluscs, and the thermoluminescent signal in remnant Last Interglacial barrier sediments provides the chronological framework for this investigation. Results from this paper show that the barrier estuary occupies a relatively narrow (<1.5 km wide) and shallow (<40 m deep) incised bedrock valley formed during sea-level lowstands. Late Pleistocene sedimentary successions and remnants of the Last Interglacial barrier have been preserved within the incised valley axis and the mouth of the incised valley. These sediments, deposited during the Last Interglacial sea-level highstand, have subsequently been partially removed during the last glacial maximum. Overlying the antecedent late Pleistocene landsurface is a near basin-wide basal marine sand deposited in response to rising sea level associated with the most recent post-glacial marine transgression, which inundated the shallow incised valley ca.7800 years ago. More open marine conditions, with a diverse assemblage of estuarine and marine mollusc species, persisted until ca. 4500 years ago when the stabilizing Holocene barrier resulted in the development of a lowenergy back-barrier lagoonal environment. A late Holocene 1-2 m regression of sea level ca. 3000 years ago further restricted oceanic circulation, increased the rate of fluvial bay-head delta progradation and the extension of the backbarrier central basin mud facies. This evolutionary model of barrier estuary evolution developed for Burrill Lake is consistent with recent research conducted in Lake Illawarra and St Georges Basin and can be applied to other estuaries that have formed in relatively shallow and narrow incised bedrock valleys on tectonically stable, wave-dominated coastlines.

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Carbon Nanotubes: Enhancing The Polymer Building Blocks For Intelligent Materials, Marc In Het Panhuis Jan 2006

Carbon Nanotubes: Enhancing The Polymer Building Blocks For Intelligent Materials, Marc In Het Panhuis

Faculty of Science - Papers (Archive)

Electroactive polymers can be engineered at the molecular level to recognise external stimuli, they are conductive and they are capable of localised processing. These are properties which make them ideal building blocks for intelligent materials. This article investigates the suitability of carbon nanotubes of enhancing (polymer) building blocks for intelligent materials.

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Random Mating In The Brooding Coral Acropora Palifera, Karen Miller, David J. Ayre Jan 2006

Random Mating In The Brooding Coral Acropora Palifera, Karen Miller, David J. Ayre

Faculty of Science - Papers (Archive)

For marine invertebrates such as corals, restricted dispersal of sperm and/or larvae have been invoked to explain large heterozygote deficits and population subdivision apparent in many genetic surveys. Equally though, for the many corals and other invertebrates that are hermaphroditic, inbreeding through self-fertilisation may also account for heterozygote deficits. Flexibility of mating systems to allow at least some level of self-fertilisation may be favoured by selection, as this would facilitate the founding of new populations by low numbers or densities of colonists. While tests for self-compatibility are relatively easy for broadcast-spawning corals, experimentally determining the level of selfing in corals …

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Sydney's Creative Economy: Social And Spatial Challenges, Christopher R. Gibson Jan 2006

Sydney's Creative Economy: Social And Spatial Challenges, Christopher R. Gibson

Faculty of Science - Papers (Archive)

The recent popularity of Richard Florida's work on the rise of the 'creative class' invites attention not only on the size and impact of the creative economy in Australia, but on its geography as well." At the core of Florida's approach is the premise that places compete with each other for a new kind of economic development, fuelled not by the availability of raw materials, cheap labour, or state investment in infrastructure, but by the decisions of producers in creative industries such as film, music, design and advertising to live and work in particular localities. Such creative producers constitute a …

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Tandem Mass Spectrometry Reveals The Quaternary Organization Of Macromolecular Assemblies, J L Benesch, Andrew Aquilina, Brandon T. Ruotolo, Frank Sobott, C V Robinson Jan 2006

Tandem Mass Spectrometry Reveals The Quaternary Organization Of Macromolecular Assemblies, J L Benesch, Andrew Aquilina, Brandon T. Ruotolo, Frank Sobott, C V Robinson

Faculty of Science - Papers (Archive)

The application of mass spectrometry (MS) to the study of progressively larger and more complex macromolecular assemblies is proving increasingly useful for structural biologists. The scope of this approach has recently been widened through the application of a tandem MS procedure. This two-step technique involves the selection of specific assemblies in the gas phase, and inducing their dissociation through collisions with argon atoms. Here we investigate the mechanism of this process and show that dissociation of subunits from a macromolecular assembly follows a sequential pathway, with the partitioning of charge between the dissociation products governed primarily by their relative surface …

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Microcosm: A Lost Cost 3-D Wireless Sensor Test-Bed Within A Controllable Environment, David Marsh, Richard Tynan, Stephen T. Beirne, Roderick L. Shepherd, Gregory O'Hare, Dermot Diamond, Brian Corcoran Jan 2006

Microcosm: A Lost Cost 3-D Wireless Sensor Test-Bed Within A Controllable Environment, David Marsh, Richard Tynan, Stephen T. Beirne, Roderick L. Shepherd, Gregory O'Hare, Dermot Diamond, Brian Corcoran

Faculty of Science - Papers (Archive)

This paper describes the creation of Microcosm, a low cost wireless sensor network test-bed within a controlled environment to facilitate WSN experiments in three dimensions, with an emphasis on executing sensing-related experiments. The design of the sensing hardware, software, support tools and the experimental environment itself are given. Issues related to the design of this configuration are discussed, with the potential pitfalls and eventual solutions alike given. Finally, current and future uses for the test-bed are listed.

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Demographic Feedback Between Clonal Growth And Fragmentation In An Invasive Seaweed, Jeffrey T. Wright, Andrew R. Davis Jan 2006

Demographic Feedback Between Clonal Growth And Fragmentation In An Invasive Seaweed, Jeffrey T. Wright, Andrew R. Davis

Faculty of Science - Papers (Archive)

Many abundant plants, invertebrates, and seaweed are clonal, and this allows the formation of high-density aggregations, foraging, and the placement of modules into new space, and rapid rates of expansion. For these species, population density and rates of expansion are functions of recruitment of asexual modules and post-recruitment vegetative growth and survivorship. In this study, we provide the first experimental test of the relative importance of these two processes in determining the abundance of a clonal seaweed using Caulerpa taxifolia, an invasive green alga that spreads rapidly and reaches very high abundance. We asked two main questions: What is …

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Polyamide Platinum Anti-Cancer Complexes Designed To Target Specific Dna Sequences, David Jaramillo, Nial J. Wheate, Stephen F. Ralph, Warren A. Howard, Yitzhak Tor, Janice Aldrich-Wright Jan 2006

Polyamide Platinum Anti-Cancer Complexes Designed To Target Specific Dna Sequences, David Jaramillo, Nial J. Wheate, Stephen F. Ralph, Warren A. Howard, Yitzhak Tor, Janice Aldrich-Wright

Faculty of Science - Papers (Archive)

Two new platinum complexes, trans-chlorodiammine[N-(2-aminoethyl)-4-[4-(N-methylimidazole-2-carboxamido)-N-methylpyrrole-2-carboxamido]-N-methylpyrrole-2-carboxamide]platinum(II) chloride (DJ1953-2) and trans-chlorodiammine[N-(6-aminohexyl)-4-[4-(N-methylimidazole-2-carboxamido)-N-methylpyrrole-2-carboxamido]-N-methylpyrrole-2-carboxamide]platinum(II) chloride (DJ1953-6) have been synthesized as proof-of-concept molecules in the design of agents that can specifically target genes in DNA. Coordinate covalent binding to DNA was demonstrated with electrospray ionization mass spectrometry. Using circular dichroism, these complexes were found to show greater DNA binding affinity to the target sequence:  d(CATTGTCAGAC)2, than toward either d(GTCTGTCAATG)2, which contains different flanking sequences, or d(CATTGAGAGAC)2, which contains a double base pair mismatch sequence. DJ1953-2 unwinds the DNA helix by around 13°, but neither metal complex significantly affects the DNA melting temperature. Unlike simple DNA minor …

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Annotated Possum And Glider Records From The Queensland Naturalist, Kevin Maloney, Jamie Harris Jan 2006

Annotated Possum And Glider Records From The Queensland Naturalist, Kevin Maloney, Jamie Harris

Faculty of Science - Papers (Archive)

Valuable observations on the occurrence of species are often recorded and published by naturalists. -The Queensland Naturalist is an important source of historic records on the distribution of many species. In this report, we survey past volumes of this journal records of possum and glider species, and also provide the latest sources of information on the distribution of possums and gliders in Queensland (Qld).

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Development Of A Submerged Membrane Fungi Reactor For Textile Wastewater Treatment, Faisal I. Hai, Kazuo Yamamoto, Kensuke Fukushi Jan 2006

Development Of A Submerged Membrane Fungi Reactor For Textile Wastewater Treatment, Faisal I. Hai, Kazuo Yamamoto, Kensuke Fukushi

Faculty of Science - Papers (Archive)

A submerged microfiltration membrane bioreactor implementing the white-rot fungus Coriolus versicolor was developed for the treatment of textile dye wastewater following explorations with different fouling-prevention techniques. The optimum combination ensuring permeate quality and precluding membrane fouling comprises of placing a bundle of hollow fibers within a non-woven coarse-pore (50–200 μm) mesh cage, so as to avoid direct deposition of sludge onto it, together with arrangements for its periodic high-pressure back-washing (3 s/10 min) and chemical back-flushing (100 ml/m2, every third day). Under controlled temperature (29±1°C) and pH (4.5±0.2), and applied HRT and an average flux of 15 h and 0.021 …

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Annotated Records Of The Greater Glider, Petauroides Volans, From The Victorian Naturalist 1884-2005, K Shane Maloney, Jamie M. Harris Jan 2006

Annotated Records Of The Greater Glider, Petauroides Volans, From The Victorian Naturalist 1884-2005, K Shane Maloney, Jamie M. Harris

Faculty of Science - Papers (Archive)

A survey of The Victorian Naturalist was undertaken for records of the Greater Glider Petauroides volans. This report compiles around 52 distribution records, and summarises naturalists’ observations of the animal’s behaviour and feeding. Those concerned with the ecology and conservation of arboreal marsupials generally, and the Greater Glider in particular, should find this work useful as it compiles many interesting and important records of this the largest and most conspicuous of the gliding possums.

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Membrane Coupled Fungi Reactor - An Innovative Approach To Bioremediation Of Hazardous Dye Wastewater, Faisal I. Hai, Kazuo Yamamoto, Kensuke Fukushi Jan 2006

Membrane Coupled Fungi Reactor - An Innovative Approach To Bioremediation Of Hazardous Dye Wastewater, Faisal I. Hai, Kazuo Yamamoto, Kensuke Fukushi

Faculty of Science - Papers (Archive)

Virtually all the known physico-chemical and biological techniques have been explored for treatment of extremely recalcitrant dye wastewater; none, however, has emerged as a panacea. A single universally applicable end-of-pipe solution appears to be unrealistic, and combination of appropriate techniques is deemed imperative to devise technically and economically feasible options. An in-depth evaluation of wide range of potential hybrid technologies delineated in literature along with plausible analyses of available cost information has been furnished. In addition to underscoring the indispensability of hybrid technologies, this paper also endorses the inclusion of energy and water reuse plan within the treatment scheme, and …

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Seasonal And Latitudinal Variation Of Atmospheric Methane: A Ground-Based And Ship-Borne Solar Ir Spectroscopic Study, T. Warneke, J. Meirink, P. Bergamaschi, J. Grooss, J. Notholt, G. Toon, Voltaire A. Velazco, A. Goede, O. Schrems Jan 2006

Seasonal And Latitudinal Variation Of Atmospheric Methane: A Ground-Based And Ship-Borne Solar Ir Spectroscopic Study, T. Warneke, J. Meirink, P. Bergamaschi, J. Grooss, J. Notholt, G. Toon, Voltaire A. Velazco, A. Goede, O. Schrems

Faculty of Science - Papers (Archive)

Column-averaged volume mixing ratios of CH4 were retrieved with a precision of better than 0.5% from infrared solar absorption spectra obtained at Ny-Alesund (Spitsbergen, 79°N) between 1997 and 2004 and during two ship cruises (54°N–34°S) on the Atlantic in 2003. The retrieval has been performed in a spectral region available to all operational FTIR (Fourier Transform InfraRed) spectrometers performing solar absorption measurements. The seasonality and the long-term increase of the tropospheric volume-mixing ratio, derived from the infrared measurements agree well with data from surface sampling at this site. The latitudinal variation of ship-borne measurements between 54°N and 34°S is in …

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Copper In Marine Waters: What Does It Do To Microalgae?, Brad Angel Jan 2006

Copper In Marine Waters: What Does It Do To Microalgae?, Brad Angel

Faculty of Science - Papers (Archive)

Coastal waters adjacent to industrialised catchments are likely to receive contaminants from urban run-off, storm water drains, and industrial effluent discharges. While routine monitoring may indicate that contaminant concentrations are below levels of regulatory concern, there is generally a poor understanding of the rate, concentration and consistency of contaminant inputs and the associated biological effects.

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New Integron-Associated Gene Cassette Encoding A Trimethoprim-Resistant Dfrb-Type Dihydrofolate Reductase, Renee Levings, D. Lightfoot, Liam Elbourne, R. M. Hall, Steven P. Djordjevic Jan 2006

New Integron-Associated Gene Cassette Encoding A Trimethoprim-Resistant Dfrb-Type Dihydrofolate Reductase, Renee Levings, D. Lightfoot, Liam Elbourne, R. M. Hall, Steven P. Djordjevic

Faculty of Science - Papers (Archive)

A sixth gene cassette containing a dfrB-type gene, dfrB6, was found in a dfrB6-aadA1 cassette array in class 1 integrons. This array was isolated from several multiply antibiotic-resistant Salmonella enterica serovar Infantis strains that appear to be clonally related. The DfrB6 dihydrofolate reductase conferred resistance to trimethoprim.

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Non-Invasive Determination Of Optical Lever Sensitivity In Atomic Force Microscopy, Jason P. Cleveland, Roger Proksch, Michael J. Higgins, S Mcendoo, Martin Polcik, Suzi P. Jarvis, John E. Sader Jan 2006

Non-Invasive Determination Of Optical Lever Sensitivity In Atomic Force Microscopy, Jason P. Cleveland, Roger Proksch, Michael J. Higgins, S Mcendoo, Martin Polcik, Suzi P. Jarvis, John E. Sader

Faculty of Science - Papers (Archive)

No abstract provided.

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Afm In Liquid: A High Sensitivity Study On Biological Membranes, Michael J. Higgins, Takeshi Fukuma, Suzi P. Jarvis Jan 2006

Afm In Liquid: A High Sensitivity Study On Biological Membranes, Michael J. Higgins, Takeshi Fukuma, Suzi P. Jarvis

Faculty of Science - Papers (Archive)

Frequency Modulation AFM (FM-AFM) is commonly operated in ultra-high vacuum, though its inception in liquids for biological samples is relatively new. Here, we highlight the ability of FM-AFM to perform molecular resolution imaging of biomembrane surfaces and to detect individual layers of structured water at similar membrane interfaces. These studies highlight the potential of FM-AFM for studying model membranes and lipid raft systems on the molecular scale.

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Signs Of Life: Engraved Stone Artefacts From Neolithic South India, A Brumm, Nicole Boivin, Richard Fullagar Jan 2006

Signs Of Life: Engraved Stone Artefacts From Neolithic South India, A Brumm, Nicole Boivin, Richard Fullagar

Faculty of Science - Papers (Archive)

While exceedingly rare on any given archaeological site, engraved stone artefacts have nonetheless been reported from sites covering a range of periods mid regions across the world. Attempts to interpret such engravings have often focused on potential representational or communicative functions, including their role in notational systems, symbolic depiction, and the development of early forms of writing. Contextual and microscopic investigation Of a number of engraved artefacts discovered in a large assemblage of dolerite artefacts excavated from a Neolithic hilltop habitation and stone-tool production site in south India suggests, however, that an alternative interpretation of engraved stone artefacts is possible. …

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Serum Opacity Factor Promotes Group A Streptococcal Epithelial Cell Invasion And Virulence, A M. Timmer, S. A. Kristian, V. Datta, A. Jeng, C. M. Gillen, Mark J. Walker, B. Beall, V. Nizet Jan 2006

Serum Opacity Factor Promotes Group A Streptococcal Epithelial Cell Invasion And Virulence, A M. Timmer, S. A. Kristian, V. Datta, A. Jeng, C. M. Gillen, Mark J. Walker, B. Beall, V. Nizet

Faculty of Science - Papers (Archive)

Serum opacity factor (SOF) is a bifunctional cell surface protein expressed by 40-50% of group A streptococcal (GAS) strains comprised of a C-terminal domain that binds fibronectin and an N-terminal domain that mediates opacification of mammalian sera. The sof gene was recently discovered to be co-transcribed in a two-gene operon with a gene encoding another fibronectin-binding protein, sfbX. We compared the ability of a SOF(+) wild-type (WT) serotype M49 GAS strain and isogenic mutants lacking SOF or SfbX to invade cultured HEp-2 human pharyngeal epithelial cells. Elimination of SOF led to a significant decrease in HEp-2 intracellular invasion while loss …

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Generic Construction Of Hybrid Public Key Traitor Tracing With Full-Public-Traceability, Duong Hieu Phan, Rei Safavi-Naini, Joseph Tonien Jan 2006

Generic Construction Of Hybrid Public Key Traitor Tracing With Full-Public-Traceability, Duong Hieu Phan, Rei Safavi-Naini, Joseph Tonien

Faculty of Engineering and Information Sciences - Papers: Part A

No abstract provided.

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An Efficient Single-Key Pirates Tracing Scheme Using Cover-Free Families, Joseph Tonien, Rei Safavi-Naini Jan 2006

An Efficient Single-Key Pirates Tracing Scheme Using Cover-Free Families, Joseph Tonien, Rei Safavi-Naini

Faculty of Engineering and Information Sciences - Papers: Part A

A cover-free family is a well-studied combinatorial structure that has many applications in computer science and cryptography. In this paper, we propose a new public key traitor tracing scheme based on cover-free families. The new traitor tracing scheme is similar to the Boneh-Franklin scheme except that in the Boneh-Franklin scheme, decryption keys are derived from Reed-Solomon codes while in our case they are derived from a cover-free family. This results in much simpler and faster tracing algorithms for single-key pirate decoders, compared to the tracing algorithms of Boneh-Franklin scheme that use Berlekamp- Welch algorithm. Our tracing algorithms never accuse innocent …

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Control Stabilisation Of An Islanded System With Dfig Wind Turbine, M Aktarujjaman, Kashem M. Muttaqi, Michael Negnevitsky, Gerard Ledwich Jan 2006

Control Stabilisation Of An Islanded System With Dfig Wind Turbine, M Aktarujjaman, Kashem M. Muttaqi, Michael Negnevitsky, Gerard Ledwich

Faculty of Engineering and Information Sciences - Papers: Part A

Distributed Generation (DG) is often used to export power to the utility system. Loss of main supply can cause a severe loading mismatch between DG generation and load consumption. Consequently, the voltage and frequency of the islanded system will cross the allowable limit. Due to this fact, it is essential to control the voltage and frequency in the islanding mode of operation. In this paper, control stabilisation of an islanded system with a doubly-fed induction generator (DFIG) wind turbine has been addressed. Wind DG produces variable output and is not capable to produce enough reactive power. Hence, it is imperative …

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Black Start With Dfig Based Distributed Generation After Major Emergencies, M Aktarujjaman, Kashem M. Muttaqi, Michael Negnevitsky, Gerard Ledwich Jan 2006

Black Start With Dfig Based Distributed Generation After Major Emergencies, M Aktarujjaman, Kashem M. Muttaqi, Michael Negnevitsky, Gerard Ledwich

Faculty of Engineering and Information Sciences - Papers: Part A

Grid connected distributed generation (DG) increases reliability and additional benefits for consumers as well as utilities. The stable and reliable operation of a power system is necessary after major emergencies (or blackouts) following a major system event. Distributed generation may be capable of black start and contribute to fast restoration process at medium to low voltage level. A large scale voltage and frequency excursions may occur during the process of black start with distributed generation due to low inertia and intermittency in power generation. Energy storage integrated with DG can absorb initial impact of central generation and ensure smooth load …

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