潜 刘 | The University of Hong Kong (original) (raw)
Papers by 潜 刘
Chinese Science Bulletin, 2011
The timing and nature of biotic recovery from the devastating end-Permian mass extinction (252 Ma... more The timing and nature of biotic recovery from the devastating end-Permian mass extinction (252 Ma) are much debated. New studies in South China suggest that complex marine ecosystems did not become re-established until the middle-late Anisian (Middle Triassic), much later than had been proposed by some. The recently discovered exceptionally preserved Luoping biota from the Anisian Stage of the Middle Triassic, Yunnan Province and southwest China shows this final stage of community assembly on the continental shelf. The fossil assemblage is a mixture of marine animals, including abundant lightly sclerotized arthropods, associated with fishes, marine reptiles, bivalves, gastropods, belemnoids, ammonoids, echinoderms, brachiopods, conodonts and foraminifers, as well as plants and rare arthropods from nearby land. In some ways, the Luoping biota rebuilt the framework of the pre-extinction latest Permian marine ecosystem, but it differed too in profound ways. New trophic levels were introduced, most notably among top predators in the form of the diverse marine reptiles that had no evident analogues in the Late Permian. The Luoping biota is one of the most diverse Triassic marine fossil Lagerstätten in the world, providing a new and early window on recovery and radiation of Triassic marine ecosystems some 10 Myr after the end-Permian mass extinction.
A new priapulid assemblage, including 4 palaeoscolecidans and one corynetiid, is reported from th... more A new priapulid assemblage, including 4 palaeoscolecidans and one corynetiid, is reported from the Guanshan fossil Lagerstätte (Cambrian Stage 4, Series 2) from East Yunnan, SW China. Three palaeoscolecidan new species, namely Yunnanoscolex magnus gen. et sp. nov., Wudingscolex sapushanensis gen. et sp. nov., Paramaotianshania zijunia gen. et sp. nov., and a new corynetiid species, Corynetis fortis sp. nov. are described. The lifestyles of these animals and their ecological significance are discussed. The occurrence of abundant and diverse priapulids from both the Chengjiang and Guanshan fossil Lagerstätten in East Yunnan indicates a possible radiation centre of this animal group on the soft-substratum shelf of the western part of the Yangtze Platform.
Chinese Science Bulletin, 2011
Physica C: Superconductivity, 2009
Physica C: Superconductivity, 2010
A series of new superconductors Sr 2Àx Ba x CuO 3+d (x 6 0.6) were prepared under high pressure h... more A series of new superconductors Sr 2Àx Ba x CuO 3+d (x 6 0.6) were prepared under high pressure high temperature. The superconductors crystallize into K 2 NiF 4-type structure of I4/mmm space group similar to the classical La 2 CuO 4 but with partially occupied apical oxygen. It is found that T c of this barium doped Sr 2 CuO 3+d superconductor is associated with the ratio of A-site cation substitution while keeping at optimal carrier doping level. The superconducting transition temperature with T max c ¼ 98 K which represents the record high T c in the single-layer copper oxide superconductors was achieved in this material.
Journal of Superconductivity and Novel Magnetism, 2010
Journal of Nanoparticle Research, 2011
Journal of Hydrologic Engineering, 2009
Journal of Applied Physics, 2012
In nano-grain BaTiO 3 ceramics, internal compressive stresses make the cubic phase more stable, w... more In nano-grain BaTiO 3 ceramics, internal compressive stresses make the cubic phase more stable, while internal shear stresses stabilize rhombohedral and orthorhombic phases. The competition between internal compressive stresses and internal shear stresses gives a ferroelectric to paraelectric to ferroelectric reentrance phenomenon as a function of grain size. The pressure can be a tuning factor of reentrance behavior by controlling the interactions between external hydrostatic pressure and internal compressive stresses. These experimental phenomena can be well described by a modified Ginzburg-Landau-Devonshire thermodynamic theory. V
International Journal of Polymeric Materials, 2008
The thermal behavior of poly-L-lactide (PLLA) isothermal crystallization upon cooling from the me... more The thermal behavior of poly-L-lactide (PLLA) isothermal crystallization upon cooling from the melt was investigated using differential scanning calorimetry (DSC), wide-angle X-ray diffraction (WAXD) and polarizing microscope (POM) by changing the crystallization temperature and time. It was indicated that 110°C should be a critical temperature for PLLA melting crystallization. The melting point of crystallized PLLA discontinuously changed with crystallization temperature,
EPL (Europhysics Letters), 2009
![Research paper thumbnail of Symmetry of unoccupied electronic states in the high-T[sub c] superconductor Sr[sub 2]CuO[sub 2+δ]Cl[sub 2−y] studied by electron energy-loss spectroscopy](https://attachments.academia-assets.com/67309373/thumbnails/1.jpg)
](Applied Physics Letters, 2006
Chinese Science Bulletin, 2011
The timing and nature of biotic recovery from the devastating end-Permian mass extinction (252 Ma... more The timing and nature of biotic recovery from the devastating end-Permian mass extinction (252 Ma) are much debated. New studies in South China suggest that complex marine ecosystems did not become re-established until the middle-late Anisian (Middle Triassic), much later than had been proposed by some. The recently discovered exceptionally preserved Luoping biota from the Anisian Stage of the Middle Triassic, Yunnan Province and southwest China shows this final stage of community assembly on the continental shelf. The fossil assemblage is a mixture of marine animals, including abundant lightly sclerotized arthropods, associated with fishes, marine reptiles, bivalves, gastropods, belemnoids, ammonoids, echinoderms, brachiopods, conodonts and foraminifers, as well as plants and rare arthropods from nearby land. In some ways, the Luoping biota rebuilt the framework of the pre-extinction latest Permian marine ecosystem, but it differed too in profound ways. New trophic levels were introduced, most notably among top predators in the form of the diverse marine reptiles that had no evident analogues in the Late Permian. The Luoping biota is one of the most diverse Triassic marine fossil Lagerstätten in the world, providing a new and early window on recovery and radiation of Triassic marine ecosystems some 10 Myr after the end-Permian mass extinction.
A new priapulid assemblage, including 4 palaeoscolecidans and one corynetiid, is reported from th... more A new priapulid assemblage, including 4 palaeoscolecidans and one corynetiid, is reported from the Guanshan fossil Lagerstätte (Cambrian Stage 4, Series 2) from East Yunnan, SW China. Three palaeoscolecidan new species, namely Yunnanoscolex magnus gen. et sp. nov., Wudingscolex sapushanensis gen. et sp. nov., Paramaotianshania zijunia gen. et sp. nov., and a new corynetiid species, Corynetis fortis sp. nov. are described. The lifestyles of these animals and their ecological significance are discussed. The occurrence of abundant and diverse priapulids from both the Chengjiang and Guanshan fossil Lagerstätten in East Yunnan indicates a possible radiation centre of this animal group on the soft-substratum shelf of the western part of the Yangtze Platform.
Chinese Science Bulletin, 2011
Physica C: Superconductivity, 2009
Physica C: Superconductivity, 2010
A series of new superconductors Sr 2Àx Ba x CuO 3+d (x 6 0.6) were prepared under high pressure h... more A series of new superconductors Sr 2Àx Ba x CuO 3+d (x 6 0.6) were prepared under high pressure high temperature. The superconductors crystallize into K 2 NiF 4-type structure of I4/mmm space group similar to the classical La 2 CuO 4 but with partially occupied apical oxygen. It is found that T c of this barium doped Sr 2 CuO 3+d superconductor is associated with the ratio of A-site cation substitution while keeping at optimal carrier doping level. The superconducting transition temperature with T max c ¼ 98 K which represents the record high T c in the single-layer copper oxide superconductors was achieved in this material.
Journal of Superconductivity and Novel Magnetism, 2010
Journal of Nanoparticle Research, 2011
Journal of Hydrologic Engineering, 2009
Journal of Applied Physics, 2012
In nano-grain BaTiO 3 ceramics, internal compressive stresses make the cubic phase more stable, w... more In nano-grain BaTiO 3 ceramics, internal compressive stresses make the cubic phase more stable, while internal shear stresses stabilize rhombohedral and orthorhombic phases. The competition between internal compressive stresses and internal shear stresses gives a ferroelectric to paraelectric to ferroelectric reentrance phenomenon as a function of grain size. The pressure can be a tuning factor of reentrance behavior by controlling the interactions between external hydrostatic pressure and internal compressive stresses. These experimental phenomena can be well described by a modified Ginzburg-Landau-Devonshire thermodynamic theory. V
International Journal of Polymeric Materials, 2008
The thermal behavior of poly-L-lactide (PLLA) isothermal crystallization upon cooling from the me... more The thermal behavior of poly-L-lactide (PLLA) isothermal crystallization upon cooling from the melt was investigated using differential scanning calorimetry (DSC), wide-angle X-ray diffraction (WAXD) and polarizing microscope (POM) by changing the crystallization temperature and time. It was indicated that 110°C should be a critical temperature for PLLA melting crystallization. The melting point of crystallized PLLA discontinuously changed with crystallization temperature,
EPL (Europhysics Letters), 2009
Applied Physics Letters, 2006