In the presence of Ag 2O,the 1 bromobixadecane was converted to dotriacontane in high yeild by stirring with protection from light in DMF at 80 ℃ for 24 h.

By spectroscopic evidence they were identified as β-sitosterol, n-dotriacontanol, 3-friedelanone, N-phenyl-1-naphthy-lamine.

Byspectroscopic evidence they were identified as N-phenyl-1-naphthylamine,n-dotriacontanol,9,12,15-octadecatriene-1-ol and hexadecanoic acid ethyl ester; Threecompounds were isolated from the bark of Sapium Sebiferum.

With a variational method and a modified arrangmement channel quantum mechanics(MACQM) method,the energies of a equilateral triangle H-3 and a tetrahedron H-4 system are calculated.

Fraunhofer diffraction light intensity distribution of the equilateral triangle and the equilateral hexagon pore;

Using the variational method and the modified arrangmement channel quantum mechanics(MACQM) method,the energy curve of the equilateral triangle structure of H_3 has been calculated.

In this paper, we give a method for cutting out a maximal equilateral triangle from a square and a strict proof of this method.

Determination of trace lead in crude oils by trioctylamine extraction-spectrophotometry;

Based on the current situation of the supply and demand of China s medical and health resource, this paper, with the data collected, expounds the inharmonious phenomenon of "upside-down triangle" and "regular triangle" in the first part.