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     This PH value detecting method, which is different from old ones, remains unaffected by the factors such as the amount of water, absorbing time, and stagnant time of aerosols.
     与传统方法不同,本方法测量出的PH值具有唯一性,即每种气溶胶灭火剂产物的PH测定值与气溶胶灭火剂产物的组成有关而与吸收水量、吸收时间、气溶胶的留空时间无关。
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     A reasonable and excellent aerodynamic configuration with the reliable stability and minimum drag is significant for strengthening the capability against the gust and pro1onging the operation time at such a high altitude.
     指出 :合理、良好的气动外形 (具备可靠的稳定性和最小阻力 ) ,对提高抗风能力、增加留空时间都有重要意义。
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     Modification of winglet is adopted to raise the lift-drag ratio of the UAV for extension endurance,for enlarge range and for increase ceiling.
     为延长无人机留空时间,加大航程和提高升限,可采用加装翼尖小翼的方法使无人机的升阻比有所提高。
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     We also built and tested the mini-UAV. This plane achieved an endurance of 68 minutes and the results of test flights proved the effectiveness and high accuracy of the optimization.
     由试飞结果可知,该机的留空时间为68min,与优化计算结果十分相近,证明了优化计算结果的可行性和高精度。
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     The attenuation of composite smoke based on coated metal microspheres is larger than 99% and the time for it staying in the air is longer.
     由镀金属微球组成的复合烟幕对激光的衰减率大于99%,留空时间长。
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  相似匹配句对
     Time is...
     时间
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     Time
     时间
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     3.tight inside and loose outside;
     三、内紧外驰 ,疏密分明而下档留空
短句来源
     The attenuation of composite smoke based on coated metal microspheres is larger than 99% and the time for it staying in the air is longer.
     由镀金属微球组成的复合烟幕对激光的衰减率大于99%,留空时间长。
短句来源
     About the means of urban planning, it is most important to leave a blank to develop urban fringe;
     在具体的城市规划手段层面,最重要的是以生态利益优先的留空式发展,空出生态价值优越的区域;
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The report presents aerodynamic properties of the tethered balloons in the natural and streamlined shape at some fixed altitude and puts emphasis on exploration of the effects of angle of attack and Reynolds number on lift, drag and pitching moment of the balloons. A reasonable and excellent aerodynamic configuration with the reliable stability and minimum drag is significant for strengthening the capability against the gust and pro1onging the operation time at such a high altitude.

介绍自然形状和流线形状两种高空系缆气球的空气动力特性。着重探讨攻角和雷诺数对升力、阻力和俯仰力矩的影响。指出 :合理、良好的气动外形 (具备可靠的稳定性和最小阻力 ) ,对提高抗风能力、增加留空时间都有重要意义。

Fire extinguishing aerosols are of high performance. The PH value detection of fire extinguishing aerosols is helpful in developing new fire extinguishing agents. This PH value detecting method, which is different from old ones, remains unaffected by the factors such as the amount of water, absorbing time, and stagnant time of aerosols. This method offers a better choice to compare the acidity and basicity among different fire extinguishing aerosols.

气溶胶灭火剂是高效灭火剂,气溶胶灭火剂产物PH值测量对新型气溶胶灭火剂的开发有指导作用。与传统方法不同,本方法测量出的PH值具有唯一性,即每种气溶胶灭火剂产物的PH测定值与气溶胶灭火剂产物的组成有关而与吸收水量、吸收时间、气溶胶的留空时间无关。该方法能更好的比较不同气溶胶灭火剂产物间的酸碱度。

An optimization design of an electrical-motor-powered micro air vehicle with a wing span of 320 mm is presented in this paper. The objective of optimization is its endurance. Genetic optimization algorithm is used as the primary optimizer. To reduce the number of aerodynamics analysis and to promote the efficiency of optimization, the variable fidelity optimization technique is used. The post-optimality analysis is performed and a general design rule for micro air vehicles (MAVs) is proposed according to the...

An optimization design of an electrical-motor-powered micro air vehicle with a wing span of 320 mm is presented in this paper. The objective of optimization is its endurance. Genetic optimization algorithm is used as the primary optimizer. To reduce the number of aerodynamics analysis and to promote the efficiency of optimization, the variable fidelity optimization technique is used. The post-optimality analysis is performed and a general design rule for micro air vehicles (MAVs) is proposed according to the analysis. Our MAV has currently achieved an endurance of 20 minutes and a maximum range of 12 km. The result of test flight shows that the optimization plays a key role in the improvement of the MAV performance.

介绍了翼展为320mm的电动力微型飞机的一体化优化设计方法,优化设计的目标是飞机的留空时间。为求出全局最优解,选择遗传算法作为优化算子,同时采用了变复杂度的优化计算方法提高设计计算效率,然后进行了优化灵敏度分析,并根据分析结果提出了微型飞机的一般设计准则。

 
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