By omitting diode bridge rectifier,the Bridgeless-Boost and Halfbridge-Boost topologies in the continuous conduction mode(CCM) can reduce on-state loss,and enhance the circuit efficiency around 1% than the conventional Boost-PFC.

A novel stripping voltammetry was developed for the determination of Br~-and I~-,with a glassy carbon electrode modified with chitosan by dropcoating method as a working electrode.

Tests of radionuclide migration in saturated loess soil showed that Br~- migrated faster than ()~3H, this phenomenon has significant implications in the study of radionuclide migration, but has not been determined by numerical models.

When the concentration of Br~-was 1.

The mixing scorch safety ( t s and Δ t ) of four kinds of rubber compounds (NR,SBR,BR and NBR) was measured using a Brabender torque rheometer in a wide temperature range (100～140 ℃) and rotor speed range (20～80 rpm),and compared to Mooney scorch safety ( t 5 and Δ t 30 ).

[Methods]3-bromomethyl-6,7-diomethoxy-1-methyl-2(1H)-quinoxaline(Br-DMEQ)served as fluorescent labeled reagent,acetonitrile solution(74%)as mobile phase,shim-pack CLC-C8(150 mm×6.

Methods The fatty acids were converted into the corresponding fluorescent derivstives by reaction with 3-bromomethyl-6,7-diomethoxy-1-methyl-2(1H)-quinoxalinone(Br-DMEQ)in the presence of potassium carbonate and 18-crown-6 in the acetonitrile.