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Institution

Defence Science and Technology Organisation

NonprofitCanberra, Australian Capital Territory, Australia
About: Defence Science and Technology Organisation is a(n) nonprofit organization based out in Canberra, Australian Capital Territory, Australia. It is known for research contribution in the topic(s): Radar & Clutter. The organization has 2465 authors who have published 3856 publication(s) receiving 90614 citation(s).
Topics: Radar, Clutter, Laser, Paris' law, Bistatic radar
Papers
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Journal ArticleDOI
Abstract: Current and future potential applications for three-dimensional (3D) fibre reinforced polymer composites made by the textile processes of weaving, braiding, stitching and knitting are reviewed. 3D textile composites have a vast range of properties that are superior to traditional 2D laminates, however to date these properties have not been exploited for many applications. The scientific, technical and economic issues impeding the more widespread use of 3D textile composites are identified. Structures that have been made to demonstrate the possible uses of 3D composites are described, and these include applications in aircraft, marine craft, automobiles, civil infrastructure and medical prosthesis.

920 citations


Journal ArticleDOI
R.M Dawson1Institutions (1)
01 Jul 1998-Toxicon
TL;DR: The most effective of these is the antibiotic rifampin (a drug approved for clinical use), which protects mice and rats against microcystin-induced lethality when given prophylactically and, in some cases, therapeutically.
Abstract: Microcystins are a family of more than 50 structurally similar hepatotoxins produced by species of freshwater cyanobacteria, primarily Microcystis aeruginosa. They are monocyclic heptapeptides, characterised by some invariant amino acids, including one of unusual structure which is essential for expression of toxicity. Microcystins are chemically stable, but suffer biodegradation in reservoir waters. The most common member of the family, microcystin-LR (L and R identifying the 2 variable amino acids, in this case leucine and arginine respectively) has an ld 50 in mice and rats of 36–122 μg/kg by various routes, including aerosol inhalation. Although human illnesses attributed to microcystins include gastroenteritis and allergic/irritation reactions, the primary target of the toxin is the liver, where disruption of the cytoskeleton, consequent on inhibition of protein phosphatases 1 and 2A, causes massive hepatic haemorrhage. Microcystins are tight-binding inhibitors of these protein phosphatases, with inhibition constants in the nanomolar range or lower. Uptake of microcystins into the liver occurs via a carrier-mediated transport system, and several inhibitors of uptake can antagonise the toxic effects of microcystins. The most effective of these is the antibiotic rifampin (a drug approved for clinical use), which protects mice and rats against microcystin-induced lethality when given prophylactically and, in some cases, therapeutically.

792 citations


Journal ArticleDOI
Abstract: The recent applications of fibre-reinforced polymer composites to naval ships and submarines are reviewed Since the mid-1980s the use of composites has increased considerably as the military strive to reduce the acquisition and maintenance costs and improve the structural and operational performance of naval craft A wide range of new applications of composites to naval vessels are described, including their current and potential use in the superstructures, decks, bulkheads, advanced mast systems, propellers, propulsion shafts, rudders, pipes, pumps, valves, machinery and other equipment on large warships such as frigates, destroyers and aircraft carriers Potential applications of composites to submarines are also described, such as their possible use in propulsors, control surfaces, machinery and fittings The growing use of composites in the complete construction of fast patrol boats, minehunting ships and corvettes is discussed For each application the major benefits gained from using composites instead of conventional shipbuilding materials, such as steel and aluminium alloys, are identified The paper also outlines the main drawbacks of using composites in naval vessels

655 citations


Journal ArticleDOI
J. M. Bowler1, Harvey Johnston2, Jon Olley3, John R. Prescott4  +4 moreInstitutions (7)
20 Feb 2003-Nature
TL;DR: A new chronology corrects previous estimates for human burials at this important site and provides a new picture of Homo sapiens adapting to deteriorating climate in the world's driest inhabited continent.
Abstract: Australia's oldest human remains, found at Lake Mungo, include the world's oldest ritual ochre burial (Mungo III) and the first recorded cremation (Mungo I). Until now, the importance of these finds has been constrained by limited chronologies and palaeoenvironmental information. Mungo III, the source of the world's oldest human mitochondrial DNA, has been variously estimated at 30 thousand years (kyr) old, 42-45 kyr old and 62 +/- 6 kyr old, while radiocarbon estimates placed the Mungo I cremation near 20-26 kyr ago. Here we report a new series of 25 optical ages showing that both burials occurred at 40 +/- 2 kyr ago and that humans were present at Lake Mungo by 50-46 kyr ago, synchronously with, or soon after, initial occupation of northern and western Australia. Stratigraphic evidence indicates fluctuations between lake-full and drier conditions from 50 to 40 kyr ago, simultaneously with increased dust deposition, human arrival and continent-wide extinction of the megafauna. This was followed by sustained aridity between 40 and 30 kyr ago. This new chronology corrects previous estimates for human burials at this important site and provides a new picture of Homo sapiens adapting to deteriorating climate in the world's driest inhabited continent.

612 citations


Journal ArticleDOI
Wei Xu1, Milan Brandt1, Shoujin Sun1, Joe Elambasseril1  +4 moreInstitutions (3)
Abstract: Novel ultrafine lamellar (α + β) microstructures comprising ultrafine (∼200–300 nm) α-laths and retained β phases were created via promoting in situ decomposition of a near α′ martensitic structure in Ti–6Al–4V additively manufactured by selective laser melting (SLM). As a consequence, the total tensile elongation to failure reached 11.4% while maintaining high yield strength above 1100 MPa, superior to both conventional SLM-fabricated Ti–6Al–4V containing non-equilibrium acicular α′ martensite and conventional mill-annealed Ti–6Al–4V. The formation and decomposition of α′ martensite in additively manufactured Ti–6Al–4V was studied via specially designed experiments including single-track deposition, multi-layer deposition and post-SLM heat treatment. The essential SLM additive manufacturing conditions for Ti–6Al–4V including layer thickness, focal offset distance and energy density, under which a near α′ martensitic structure forms in each layer and then in situ transforms into ultrafine lamellar (α + β) structures, were determined. This is the first fundamental effort that has realized complete in situ martensite decomposition in SLM-fabricated Ti–6Al–4V for outstanding mechanical properties.

587 citations


Authors

Showing all 2465 results

NameH-indexPapersCitations
Peng Shi137137165195
Wayne Hu9830833371
Johan A. Martens8872028126
Maria Forsyth8474933340
Patrick M. Sexton7535021559
Xungai Wang6867519654
Michael D. Lee6528816437
Tanya M. Monro6556815880
Jan E. Leach6422213086
Raymond C. Boston6345415839
Adrian P. Mouritz6128414191
Christine E. A. Kirschhock522319225
Robin J. Evans5255114169
Chun H. Wang513318300
Branko Ristic4825310982
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Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
20213
20203
201912
201814
201717
201652