Primitive mantle-normalized Platinum-group elements (PGE) concentration patterns for the Zhengziyanwo intrusion and Dashibao Formation basalts are of positive s
The bacterial flora in the digestive tube of Bullacta exarata Philippi and its rearing shoal were investigated. A to-tal of 157 strains of heterotrophic bacteri
To a multibeam echo sounder system (MBES), under water sound refraction plays an important role in depth measure- ment accuracy, and errors in sound velocity pr