A sufficient condition about extreme value of multivariate functions was given, and according elementary transformation of matrix, established a convenient judgement method for extreme value of multivariate functions, finally an example was given.

Discussion on the degradation of SOFC and its fast judgement;

And based on the analysis of choice and gauging of site factors,the paper puts forward the applied fast-estimation rule of aptness of single site factor and the applied fast-estimation synthetic measure of aptness of multiple site factors,which are simple but practical,and can be used to adjudge the aptness of favored tree for suitable land quickly in forest management.

Studies on rapid identification of ganoderma lucidum by fourier transform infrared spectroscopy;

Methods: Rapid identification of Aspirin was carried out by chemistry color response and thin-layer chromatography (TLC).