Three novel N-bridged derivatives of 2-(p-chlorophenyl)pyrrole were synthesized from 1-(bromomethyl)-2-(4-chlorophenyl)-4-bromo-5-(trifluoromethyl)pyrrole-3-carbonitrile, and characterized by 1H NMR, IR spectra, elemental analysis, and single crystal X-ray diffraction analysis.

Solutions to models of crack dynamics problems on bridge of composite materials;

Causes and Countermeasure of Bridge Phenomenon in Wave Soldering;

By application of the built dynamic crack model of bridge in composite materials,bridging fiber section is substituted by loads.

10m overhanging member in the corners,connecting bridge.

In order to use one-cycle control method in three-phase four-wire power system,this paper partitions the main circuit of three-phase four-wire APF with four-leg into two sub-circuits,including three-phase bridge circuit and N-phase half-bridge circuit which are based on one-cycle control independently.