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There is a high prevalence of relatively high BP among children and adolescents in Shandong, China. The present findings emphasize the importance of prevention of overweight and obesity in order to prevent future related problems such as hypertension in children and adolescents.

Ultrasound was adopted to prepare emulsion fuels between bio-oil and 0# diesel. The effects of ultrasound power and treating time on the stability of emulsion fuels were investigated. Excellent stability with stable time as long as 35 hours was obtained under an ultrasound power of 80W and a treating time of 3 minutes. Malvern nanometer particle size analyzer (Zetasizer Nano S90) was used to study the droplet size of emulsion fuels. The emulsion fuels with smaller droplet size had longer stable time. And the droplet size of the optimal emulsion fuel was around 0.4 um.

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In the present work, the emulsion fuels from bio-oil heavy fraction and 0# diesel were prepared by mechanical and ultrasound emulsification technologies. The relationship between stable time of emulsions and HLB value of emulsifier was investigated. Results indicated that lower mechanical stirring speeds and lower ultrasonic amplitudes lead to longer stable time of bio-oil heavy fraction emulsions. The stable time of emulsions reduced as HLB values increasing, and it reached a maximal value of 14 minutes under a HLB value of 1.8. Zetasizer Nano S90 was adopted to measure the droplet distribution of emulsions. The major droplet size of emulsions was smaller than 90nm. Meanwhile, the droplet distribution curve of ultrasound emulsions was much complex than those of mechanical emulsions.