The Permian coal in southwest China contains highest sulfur among the Chinese coal .Compositional variations of sumir in coal are mainly controlled by palaogeographital environmentsduring peat accumulation. High organ...The Permian coal in southwest China contains highest sulfur among the Chinese coal .Compositional variations of sumir in coal are mainly controlled by palaogeographital environmentsduring peat accumulation. High organic sulfur coal is formed in peat swamp developing in tidal flat of limited carbonate platform, and it is provided with especial petrologital and geochemical characteristics, and its organoschr-containing compounds are mainly thiophene series. The macroscopitaland microscopical shapes or types of pyrites in Late Permisn coal are diversined. Bituminous coal and anthracite are diamagnetic, but the pyrites are paramagnetic. The magnetic susceptibility oftbe pyrites is depended on the content of paramagnatic elements associnted with pyrites.展开更多
Beet armyworm is widely distributed throughout the world,it can cause damage on many kinds of crops. Differences of morphological characteristics among beet armyworm,cabbage butterfly,cotton bollworm,cabbage armyworm ...Beet armyworm is widely distributed throughout the world,it can cause damage on many kinds of crops. Differences of morphological characteristics among beet armyworm,cabbage butterfly,cotton bollworm,cabbage armyworm and Prodenia litura（Fabricius）are compared,occurrence regulation,living habits,damage characteristics and control methods of beet armyworm are introduced.展开更多
文摘The Permian coal in southwest China contains highest sulfur among the Chinese coal .Compositional variations of sumir in coal are mainly controlled by palaogeographital environmentsduring peat accumulation. High organic sulfur coal is formed in peat swamp developing in tidal flat of limited carbonate platform, and it is provided with especial petrologital and geochemical characteristics, and its organoschr-containing compounds are mainly thiophene series. The macroscopitaland microscopical shapes or types of pyrites in Late Permisn coal are diversined. Bituminous coal and anthracite are diamagnetic, but the pyrites are paramagnetic. The magnetic susceptibility oftbe pyrites is depended on the content of paramagnatic elements associnted with pyrites.
文摘Beet armyworm is widely distributed throughout the world,it can cause damage on many kinds of crops. Differences of morphological characteristics among beet armyworm,cabbage butterfly,cotton bollworm,cabbage armyworm and Prodenia litura（Fabricius）are compared,occurrence regulation,living habits,damage characteristics and control methods of beet armyworm are introduced.
