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Digitale Medien

Effect of poling procedure on the properties of lead zirconate titanate/vinylidene fluoride-trifluoroethylene composites (1999)

Chan, H. L. W. ; Ng, P. K. L. ; Choy, C. L.

Woodbury, NY : American Institute of Physics (AIP)

Applied Physics Letters 74 (1999), S. 3029-3031

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ISSN: 1077-3118

Quelle: AIP Digital Archive

Thema: Physik

Notizen: Lead zirconate titanate/vinylidene fluoride-trifluoroethylene [PZT/P(VDF-TrFE)] 0–3 composites for pyroelectric sensor and piezoelectric transducer applications have been fabricated by incorporating PZT powder into a P(VDF-TrFE) copolymer matrix. The properties of these composites can be tailored to suit designated applications by varying the ceramic volume fraction and by using different poling procedures. As both phases in the composite are ferroelectric, and the piezoelectric coefficients of the ceramic and copolymer phases have opposite signs while the pyroelectric coefficients have like signs, special ways can be used to produce three groups of samples with (1) only the ceramic phase poled, (2) two phases poled in the same direction to achieve reinforced pyroelectric activity and reduced piezoelectric activity, and (3) two phases poled in opposite directions to obtain reinforced piezoelectric activity and reduced pyroelectric activity. In this work, original experimental results on the properties of PZT/P(VDF-TrFE) composites poled under different conditions are presented and possible reasons behind the reinforcement and cancellation of piezoelectric and pyroelectric properties are discussed. © 1999 American Institute of Physics.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.124054

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Digitale Medien

A revision of the South-east Asian catfish genus Silurichthys (1998)

Ng, H. H. ; Ng, P. K. L.

Oxford, UK : Blackwell Publishing Ltd

Journal of fish biology 52 (1998), S. 0

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ISSN: 1095-8649

Quelle: Blackwell Publishing Journal Backfiles 1879-2005

Thema: Biologie

Notizen: The taxonomy of the catfish genus Silurichthys is revised, and eight species are now recognized. A neotype is designated for S. hasseltii . Two new species are described: S. gibbiceps from the Barito basin in southern Borneo and S. marmoratus from north-western Borneo. Silurichthys leucopodus Fowler, 1939, is considered a subjective junior synonym of S. schneideri Volz, 1904. The extent of the gape and the relative positions of the dorsal and pelvic fins show considerable infraspecific variation and are of little taxonomic value. The number of anal-fin rays is useful if used with other meristic data such as the number of vertebrae. Colour varies infraspecifically as individuals become paler and less mottled at night, but can still be used as a secondary character in separating some species. The head and caudal fin shapes are useful discriminating characters. Mature males are smaller than females and have prominent posterior serrae on the pectoral spine and articulated segments of the first pectoral-fin element. The shape and number of these serrae are also diagnostic for some species.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1111/j.1095-8649.1998.tb00800.x

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A revision of the akysid catfish genus Acrochordonichthys Bleeker (2001)

Ng, H. H. ; Ng†, P. K. L.

Oxford, UK : Blackwell Publishing Ltd

Journal of fish biology 58 (2001), S. 0

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ISSN: 1095-8649

Quelle: Blackwell Publishing Journal Backfiles 1879-2005

Thema: Biologie

Notizen: The taxonomy of the South-east Asian catfish genus Acrochordonichthys (Akysidae) is revised.The shapes of the snout, humeral process and adipose fins are diagnostic species characters. Only four out of 11 species and one sub-species described prior to this study are considered valid, namely A. rugosus (Bleeker, 1847), A. ischnosoma Bleeker, 1858, A. chamaeleon (Vaillant, 1902), and A. pachyderma Vaillant, 1902. An additional five new species (A. guttatus, A. septentrionalis, A. mahakamensis, A. strigosus and A. falcifer) are described.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1111/j.1095-8649.2001.tb02260.x

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Feeding behaviour Hydrothermal vent crabs feast on sea ‘snow’ (2004)

Ng, N. K. ; Ng, P. K. L. ; Jeng, M.-S.

[s.l.] : Nature Publishing Group

Nature 432 (2004), S. 969-969

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ISSN: 1476-4687

Quelle: Nature Archives 1869 - 2009

Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik

Notizen: [Auszug] The crab Xenograpsus testudinatus lives at enormously high densities around the sulphur-rich hydrothermal vents found in shallow waters off Taiwan, even though this acidic environment is low in nutrients. Here we show that these crabs swarm out of their crevices at slack water and feed on the ...

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1038/432969a

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The freshwater crab fauna (Crustacea: Brachyura) of the Philippines. V. On a new genus and species of potamid from Palawan island, Philippines (1998)

Tan, S. H. ; Ng, P. K. L.

Springer

Hydrobiologia 379 (1998), S. 93-96

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ISSN: 1573-5117

Schlagwort(e): Potamidae ; Carpomon pomulum ; taxonomy ; new genus ; new species ; Philippines

Quelle: Springer Online Journal Archives 1860-2000

Thema: Biologie

Notizen: Abstract A new genus and new species of terrestrial potamid crab ( Carpomon pomulum) is described from the island of Palawan in the Philippines. This new genus can easily be distinguished from all other Philippine potamids in its smooth and inflated carapace, no trace of an epibranchial tooth, extremely low postorbital cristae, and stout and twisted male first gonopod.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1023/A:1003462104099

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