Effects of the processing steps on parathion levels during honey production and parathion removal by macroporous adsorption resins

The effects of different steps in honey production on parathion levels and parathion removal from honey using macroporous adsorption resins (MARs) were investigated in this study. Parathion residues were quantified by gas chromatography with flame photometric detection (GC-FPD) after each processing step including preheating, filtration, vacuum concentration and pasteurization. The four processing steps could reduce the initial parathion level of 2.77 to 2.73, 2.53, 2.30 and 2.23 mg/kg, respectively, and the total loss of parathion was only 19%. Meanwhile, different types of MARs were used in parathion adsorption, and the results from removal experiments showed that LS-803 resin was more efficient in removing parathion from honey than other resins LS-903, LSA-21 and LSA-900B, with the adsorption rate of above 90%.     

基于蓝牙技术的煤矿报警监控系统的应用设计

随着无线通信技术的高速发展,对通信系统的经济性、可靠性提出了越来越高的要求。文章基于蓝牙技术灵活、快速、抗干扰能力强等特点,提出了基于蓝牙技术的监控系统设计方案,为进一步利用蓝牙技术实现无线监控提供参考。     

Sensitivity analysis method for increasing the passenger demands of parking and riding

Focused on finding out the relationship between passenger demands of P&R and its influencing factors, a nested-logit mode choice model was developed based on the characteristic of different modes and transfer rules. The utility functions were given respectively according to the characteristic of each alternative. Passenger demands of different modes between O-D pairs were obtained by making use of the binary logit model. Then an equilibrium model for different modes was proposed. Under this condition, the approximate relationship between passenger demands of different modes and their characteristic indexes was modeled by the sensitivity analysis method. Shift volume among different modes was achieved by utilizing this model when their characteristic indexes were changed. A case study indicates that the model and algorithm presented in this paper are effective.