Test results show that gradation 1 and gradation 4,gradation 2 and gradation 3 have the similar performance of frost resistance; the frost resistance coefficient of the former is about 40% when the cycle of freezing and thawing is 50 and the coefficient of the latter is still larger than 70% when the cycle is 100.Besides,the former is much smaller than the latter and the frost resistance coefficient decreases with the increase of cycle of freezing and thawing.
Equal dimension GM(1,1)? polynomial fitting are all applied for the prediction for the total amount of coal in this paper. The results show that equal dimension GM(1,1) is applicable and its precision is better than the traditional method of polynomial fitting and ordinary GM(1,1).
Testing results show that the detection limit of the method is ranged between 0.0001～0.0141mg/L and the recovery for the elements determined is in the range of 90%～110%. The proposed method had been used for the determination inorganic elements in Atmospheric particles PM_(10) in Beijing.
The purpose of this note is to prove, as Lusztig stated, that the Euler characteristic of the variety of Iwahori subalgebras containing a certain nil-elliptic elementnt istcl wherel is the rank of the associated finite type Lie algebra.
The basic tool is the decomposition ofN pairs of free charged bosons with respect toglN and the commuting withglN Lie algebra of infinite matrices?l.
In all these cases we actually show that Γ=π1(M) has a finite index subgroup which is mapped onto a nonabelian free group.
In the case of 4-dimensional anticommutative algebras a construction is given that links the associated cubic surface and the 27 lines on it with the structure of subalgebras of the algebra.
The rationality of the corresponding moduli variety is proved.