The citations of the papers on chemistry in Science in China from 1989 to 1998 are statistically analyzed,including mean reference rate,number of citations published,self citation rate,etc.Through such brief study,we ...The citations of the papers on chemistry in Science in China from 1989 to 1998 are statistically analyzed,including mean reference rate,number of citations published,self citation rate,etc.Through such brief study,we realize Science in China is much better than similar Chinese journals in some basic indices and is approaching the advanced level of similar journals in the world.展开更多
It is well known that the Poincaré gauge theories of gravity do not have the structure of a standard gauge theory. Nevertheless, we show that a general form of action for the gravitational gauge fields in the gau...It is well known that the Poincaré gauge theories of gravity do not have the structure of a standard gauge theory. Nevertheless, we show that a general form of action for the gravitational gauge fields in the gauge theory does possess local Poincaré invariance.展开更多
文摘The citations of the papers on chemistry in Science in China from 1989 to 1998 are statistically analyzed,including mean reference rate,number of citations published,self citation rate,etc.Through such brief study,we realize Science in China is much better than similar Chinese journals in some basic indices and is approaching the advanced level of similar journals in the world.
基金supported by National Natural Science Foundation of China under Grant No.10675019
文摘It is well known that the Poincaré gauge theories of gravity do not have the structure of a standard gauge theory. Nevertheless, we show that a general form of action for the gravitational gauge fields in the gauge theory does possess local Poincaré invariance.