The stability,frontier orbitals,bond character,and static linear polarizability of the fluorinated fullerene H_(20)@C_(80)F_(60)

This paper uses the density functional theory under generalised gradient approximation to analyse the stability, frontier orbitals, bond character, and static linear polarizability of H20@C80F60, which has not been isolated, as well as those of the synthesised H20@C80H60. The H20@C80F60 should be considerably stable by analysing its energy and aromaticity. The inside H and outside X will play different role in the chemical reaction involving H20@C80X60 （X = H and F）. The covalence of C H bond is in the order that the inside C H bond of H20@C80F60〉 the inside C H bond of H20@C80H60〉 the outside C-H bond of H20@C80H60, whereas the C-F bond of H20@C80F60 have both the covalent and ionic characters. The static linear polarizabilities of Cso and H20@C80X60 （X =H and F） are all isotropic.

单缸柴油机的新突破——时风ZS1115H型柴油机排放达欧Ⅱ标准

我国自20世纪50年代开始自主开发柴油机，60年代形成生产能力，这与世界上第一台柴油机1900年面世大约晚了半个世纪。直到80年代，农用运输车的兴起，才给小柴带来无限生机，1995年突破700万台，成为世界产销之最，中国成为小柴生产的泱泱大国。这些年，单缸发动机的排放、噪声、耗油一直是生产厂家与消费者头疼的问题。尽管多年来在技术、质量上有所提高，但大多是缸径和功率的增加，始终没有跳出油耗高、排放差的小圈子，这不仅制约了小柴行业的发展，也给人类生存空间造成了严重危害。随着人们对绿色环保要求的提高，中国政府有关部门借鉴欧洲经验，制定了新的更严格的排放标准。自2000年开始逐步采用欧洲共同体的排放法规，从欧0开始逐步递增，并严格规定，自2006年1月1日起，我国单缸发动机将强制执行欧1标准排放限值。发动机排放指标已经成为生产企业生存与发展的头等大事。

Classification of tilting bundles over a weighted projective line of type （2, 3, 3）

We give a complete classification of tilting bundles over a weighted projective line of type （2, 3, 3）. This yields another realization of the tame concealed algebras of type E6.

Remarks on lines and minimal rational curves

We determine all of lines in the moduli space M of stable bundles for arbitrary rank and degree. A further application of minimal rational curves is also given in last section.