The synergistic effect and mechanism of two chemical sunscreens,BEMT and MBBT,have been studied.UV absorption spectrum study suggested that UV absorption peaks of BEMT and MRRT shifted when the polarities of solvents ...The synergistic effect and mechanism of two chemical sunscreens,BEMT and MBBT,have been studied.UV absorption spectrum study suggested that UV absorption peaks of BEMT and MRRT shifted when the polarities of solvents varied.In ethanol,a typical semi-polarity solvent,UV absorption capacity of BEMT was reduced compared to its capacity in a non-polarity solvent of isooctane.While the addition of MBBT can offset the impact of solvent polarity.In terms of emulsions with BEMT as the only sunscreen agent,in vitro test indicated that SPF increased as the solvent polarity rose,and the addition of MBBT can offset this impact.Sunscreen efficient can be significantly enhanced via combining water phased and oil phased sunscreen agents.展开更多
Aerodynamic design of convertible prop-rotor is a challenging and complex task.Instead of focus on a design condition,prop-rotor are requested to attain good performance in wide range of operating conditions.In presen...Aerodynamic design of convertible prop-rotor is a challenging and complex task.Instead of focus on a design condition,prop-rotor are requested to attain good performance in wide range of operating conditions.In present work,to further improve performance of prop-rotor under each operating condition,the concept of variable-pitch proprotor has been proposed.However,a compromising aerodynamic design of prop-rotor is inevitable,due to discrepancy of operating condition.Consequently,a multi-objective optimization is implemented with genetic algorithm.Factors which has significantly influenced on aerodynamic characteristics of prop-rotor are employed as design variable.To avoid expensively computational cost,two theories has been implemented and validated while it able to provide a promising result without high consuming of time.Eventually,several designed individuals within different performance has been analyzed and discussed.Subsequently a calculation of aerodynamic characteristic with highfidelity solver has been conducted as validation for designed individual.展开更多
文摘The synergistic effect and mechanism of two chemical sunscreens,BEMT and MBBT,have been studied.UV absorption spectrum study suggested that UV absorption peaks of BEMT and MRRT shifted when the polarities of solvents varied.In ethanol,a typical semi-polarity solvent,UV absorption capacity of BEMT was reduced compared to its capacity in a non-polarity solvent of isooctane.While the addition of MBBT can offset the impact of solvent polarity.In terms of emulsions with BEMT as the only sunscreen agent,in vitro test indicated that SPF increased as the solvent polarity rose,and the addition of MBBT can offset this impact.Sunscreen efficient can be significantly enhanced via combining water phased and oil phased sunscreen agents.
文摘Aerodynamic design of convertible prop-rotor is a challenging and complex task.Instead of focus on a design condition,prop-rotor are requested to attain good performance in wide range of operating conditions.In present work,to further improve performance of prop-rotor under each operating condition,the concept of variable-pitch proprotor has been proposed.However,a compromising aerodynamic design of prop-rotor is inevitable,due to discrepancy of operating condition.Consequently,a multi-objective optimization is implemented with genetic algorithm.Factors which has significantly influenced on aerodynamic characteristics of prop-rotor are employed as design variable.To avoid expensively computational cost,two theories has been implemented and validated while it able to provide a promising result without high consuming of time.Eventually,several designed individuals within different performance has been analyzed and discussed.Subsequently a calculation of aerodynamic characteristic with highfidelity solver has been conducted as validation for designed individual.
