Institution
University of Wollongong
Education•Wollongong, New South Wales, Australia•
About: University of Wollongong is a education organization based out in Wollongong, New South Wales, Australia. It is known for research contribution in the topics: Population & Context (language use). The organization has 15674 authors who have published 46658 publications receiving 1197471 citations. The organization is also known as: UOW & Wollongong University.
Topics: Population, Context (language use), Graphene, Mental health, Health care
Papers published on a yearly basis
Papers
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TL;DR: A mesoscale mechanism is proposed to reveal the origin of the high piezoelectricity in relaxor ferroelectrics, where the polar nanoregions aligned in a ferroelectric matrix can facilitate polarization rotation.
Abstract: The discovery of ultrahigh piezoelectricity in relaxor-ferroelectric solid solution single crystals is a breakthrough in ferroelectric materials. A key signature of relaxor-ferroelectric solid solutions is the existence of polar nanoregions, a nanoscale inhomogeneity, that coexist with normal ferroelectric domains. Despite two decades of extensive studies, the contribution of polar nanoregions to the underlying piezoelectric properties of relaxor ferroelectrics has yet to be established. Here we quantitatively characterize the contribution of polar nanoregions to the dielectric/piezoelectric responses of relaxor-ferroelectric crystals using a combination of cryogenic experiments and phase-field simulations. The contribution of polar nanoregions to the room-temperature dielectric and piezoelectric properties is in the range of 50-80%. A mesoscale mechanism is proposed to reveal the origin of the high piezoelectricity in relaxor ferroelectrics, where the polar nanoregions aligned in a ferroelectric matrix can facilitate polarization rotation. This mechanism emphasizes the critical role of local structure on the macroscopic properties of ferroelectric materials.
464 citations
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TL;DR: In this article, thermoluminescence (TL) dates were obtained from sandy footslope deposits at two former occupation sites that yielded a range of stone artefacts in their primary depositional setting.
Abstract: THE oldest secure date for human occupation in Greater Australia is 40kyr from eastern Papua New Guinea1, whereas slightly younger dates have been reported from southern Australia2. We now report thermoluminescence (TL) dates that suggest the arrival of people between 50 and 60 kyr in northern Australia. TL dates were obtained from sandy footslope deposits at two former occupation sites that yielded a range of stone artefacts in their primary depositional setting. Artefacts terminated mid-way down one profile, which had a basal age of about 100 kyr. Confidence in the TL dates is given by their close correspondence with radiocarbon dates obtained from the upper occupation levels. These TL dates are not only the oldest yet proposed for Aboriginal occupation but also may mark the time of initial human arrival on the Australian continent.
464 citations
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TL;DR: A comprehensive review of the recent advances on aqueous Zn-based rechargeable batteries can be found in this article, where the authors summarize and discuss the Zn anode behavior and strategies to restrain the dendrite formation and improve the plating/stripping efficiency.
463 citations
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University of Copenhagen1, University of Tartu2, Centre national de la recherche scientifique3, University of Southampton4, University of California, Berkeley5, American Museum of Natural History6, Saint Petersburg State University7, Murdoch University8, Kansas State University9, Alfred Wegener Institute for Polar and Marine Research10, University of Montpellier11, University of Alaska Fairbanks12, University of Tromsø13, French Alternative Energies and Atomic Energy Commission14, Adam Mickiewicz University in Poznań15, University of Oslo16, University of Sussex17, Russian Academy of Sciences18, University of Adelaide19, Lund University20, University of Alberta21, Institut national de la recherche agronomique22, North-Eastern Federal University23, University of Wollongong24
TL;DR: The authors' analyses indicate that both graminoids and forbs would have featured in megafaunal diets, and question the predominance of a Late Quaternary graminoid-dominated Arctic mammoth steppe.
Abstract: Although it is generally agreed that the Arctic flora is among the youngest and least diverse on Earth, the processes that shaped it are poorly understood. Here we present 50 thousand years (kyr) of Arctic vegetation history, derived from the first large-scale ancient DNA metabarcoding study of circumpolar plant diversity. For this interval we also explore nematode diversity as a proxy for modelling vegetation cover and soil quality, and diets of herbivorous megafaunal mammals, many of which became extinct around 10 kyr bp (before present). For much of the period investigated, Arctic vegetation consisted of dry steppe-tundra dominated by forbs (non-graminoid herbaceous vascular plants). During the Last Glacial Maximum (25–15 kyr bp), diversity declined markedly, although forbs remained dominant. Much changed after 10 kyr bp, with the appearance of moist tundra dominated by woody plants and graminoids. Our analyses indicate that both graminoids and forbs would have featured in megafaunal diets. As such, our findings question the predominance of a Late Quaternary graminoid-dominated Arctic mammoth steppe.
460 citations
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TL;DR: In this paper, the authors present a control strategy for the generator-side converter with maximum power extraction, where the potential excess of power is dissipated in the dump-load resistor with the chopper control, and the dc-link voltage is maintained.
Abstract: This paper presents a novel control strategy for the operation of a direct-drive permanent-magnet synchronous-generator-based stand-alone variable-speed wind turbine. The control strategy for the generator-side converter with maximum power extraction is presented. The stand-alone control is featured with output voltage and frequency controller that is capable of handling variable load. The potential excess of power is dissipated in the dump-load resistor with the chopper control, and the dc-link voltage is maintained. Dynamic representation of dc bus and small-signal analysis are presented. Simulation results show that the controllers can extract maximum power and regulate the voltage and frequency under varying wind and load conditions. The controller shows very good dynamic and steady-state performance.
460 citations
Authors
Showing all 15918 results
Name | H-index | Papers | Citations |
---|---|---|---|
Lei Jiang | 170 | 2244 | 135205 |
Menachem Elimelech | 157 | 547 | 95285 |
Yoshio Bando | 147 | 1234 | 80883 |
Paul Mitchell | 146 | 1378 | 95659 |
Jun Chen | 136 | 1856 | 77368 |
Zhen Li | 127 | 1712 | 71351 |
Neville Owen | 127 | 700 | 74166 |
Chao Zhang | 127 | 3119 | 84711 |
Jay Belsky | 124 | 441 | 55582 |
Shi Xue Dou | 122 | 2028 | 74031 |
Keith A. Johnson | 120 | 798 | 51034 |
William R. Forman | 120 | 800 | 53717 |
Yang Li | 117 | 1319 | 63111 |
Yusuke Yamauchi | 117 | 1000 | 51685 |
Guoxiu Wang | 117 | 654 | 46145 |