Preface

Instead of the invariant theory approach employed by Beloshapka and Mamai for constructing the moduli spaces of Beloshapka's universal Cauchy-Riemann(CR) models,we consider two alternative approaches borrowed from the theories of equivalence problem and Lie symmetries,each of which having its own advantages.Also the moduli space M(1,4) associated to the class of universal CR models of CR dimension 1 and codimension 4 is computed by means of the presented methods.

Chinese female chemists have been making great contributions to the development of science and technology in China. On January 21, 2014, the Committee of Chinese Female Chemists was founded by the Chinese Chemical Society for promoting communication among such chemists, publicizing their achievements, and encouraging more women to join in science research.