Effect of substitution of compensation valence on dielectric and piezoelectric properties of lead-free piezoelectric ceramics of (Bi_(1/2)Na_(1/2))TiO_3;

Density Functional Theory Studies on the Substitutional Site of Nitrogen in the Nitrogen-Incorporated ZSM-5 Zeolite;

Because the O11 atom located at the Brnsted acid site is one of the most preferred sites for nitrogen substitution,nitridation can decrease the .

The dechroming mechanism of organic acid from chrome shavings was studied from the following aspects,the depolymerization of complex compound,the replacement of H+ and the replacement of organic acid radical anion.

This article,on the basis of cold-rolled ribbed steel bars in residential buildings,introduces their characteristics and replacement of ordinary steel bars in pre-stressed unit.

The community succession and replacement of late Devonian and their correlation in central Hunan are discussed in more details.

Chloro- hydrin resin and chlorinated rubber have no distinct difference in advantages and disadvantages by comparison; and from the view- point of environment protection, chlorohydrin resin can completely replace chlorinated rubber as binder.

This process saves time and raw material, lowers considerable production cost, achieves good application result, and can replace conventional chlorite bleaching and hydrogen perox.

The high-toxic pesticide in plant protection will be replaced recently in China.

Study on Synthesis of 2,6-Substitute Purine Derivatives;

The rate constants and yields of aromatic halides containing substitutes with different electrophilicities were investigated.

Based on the data,pyrimidine analogues were classified as six species,including single substituted pyrimidine,double substituted pyrimidine,three substituted pyrimidine,four substituted pyrimidine,thiazolopyrimidine and pyridopyrimidine.