Heterophyton, a new substitute name for Allophyton X.W. Wu (Pteridopsida)

The filicopsid pteridophyta genus Allophyton X.W. Wu (1982) was established for A. dengqenensis X.W. Wu collected in Badasongduo, Dingqing County of Xizang Province, China. It was listed in Index of generic names founded on Mesozoic-cenozoic specimens from China (Wu 1993: 498) and its taxonomic position is unsettled. Rhizomopteris Schimp. (1869: 699) differs from it in its fine and furcate stem, and bundle scar in leaf scar hippocrepiform, Caulopteris Lindl. & Hutton (1832: xlix) differs from it in its leaf scar regular spread, and bundle scar in leaf scar hippocrepiform. The materials of Allophyton were collected in Mesozoic Coal Series strata, coal-bearing strata that were regarded as Jurassic by Li (1955) and from late Triassic to early-middle Jurassic by Si & Zhou (1962).

Melting,Crystallization and Thermal Degradation of Fly Ash/Lldpe Blends

Fly ash/LLDPE composite material was obtained by using the molten blending. The melting, crystallization and thermal degradation of fly ash/LLDPE blends were investigated. The results indicate that the addition of fly ash increases the molten peak of blends, which shows that fly ash has the function to prevent heat transfer. The addition of the powder of fly ash has prevented the regular spread of LLDPE molecue and has impact on the regular spread when the segmer crystallizes, spreads and moves, which slows LLDPE's crystallization rate, and has an inhibitory action to LLDPE crystalloid's growth; the starting degradation tempreture (T0, 5%weight loss ) of complex system is lower than that of pure LLDPE, but the tempreture at maximum egradation rate increases with the quantity of fly ash increasing.