pard
3.Abstract Pard- selective mononitration of toluene un-der mild conditions occurs by use of cupric ni-trate trihydrate in the presence of solid acid cata-lysts.
4.The microstructure of a laser-melted Fe-4%C-10%Sn alloy has been studied. A non-crystalline phase was found in the upper pard of the laser-melted zone. At the bottom of themelted zone, however, the microcrystalline zone which consists of α-Fe and a bct phase was ob-served.
5.In the present period, some people introduce pard S closed spaces and para-H-closed spaces by S-closed and H-closed. In this paper, We discuss characterstics and porperies of para-nearly compactspaces as well as relations between para-nearly spaces, para-S-closed spaces and para-H-closed spaces ect.
