Numerous studies in birds have shown the olfactory ratio, which ranges from less than 10% to more than 30% in a few species, to be a reliable indicator of the sense of smell.
The result shows that measurement standard error reaches minimum 0.027 for most milk sample and satisfies the national criterion of protein detection when dilution ratioranges from 6.2 to 7.4.
Using of the method of field geomagnetic load-unload response ratio, data of geomagnetic vertical-component daily ranges of Dalian seismic station from 1981 to 1991 are processed.