The objective of this paper is twofold. First we do a survey on what call the Yoshida method for studying analytic first integrals quasi-homogeneous polynomial differential systems. After, apply all systems in R3 degree 2.

Early warnings are an indispensable part of emergency management, which is a powerful way to eliminate or reduce the negative impacts caused by emergencies in advance. warning problems have been discussed from different perspectives and obtained fruitful results. Information plays critical role all kinds decision problems, with no exception for early problem. There various information types rel...

Heat flux plates are commonly used to measure soil heat flux, a component of the surface energy balance. The plate method is simple and precise, but several previous studies have demonstrated the potential for relatively large errors. Here we present the results of in situ tests of the plate method, and we describe some promising alternative methods. Summertime soil heat flux was measured with ...

A simple method for the preparation of homogeneous molecular species of plasmenylcholine and plasmenylethanolamine was developed. The method utilized reverse phase high performance liquid chromatography to isolate homogeneous molecular species of plasmenylcholine prepared by acylation of lysoplasmenylcholine. Plasmenylcholine was directly converted to plasmenylethanolamine by transphosphatidyla...