摘要：首先对影响动力电池包内外气压平衡的典型工况进行了分析,并说明了防水透气阀的工作原理,根据典型工况下透气量及防爆压力要求进行了防水透气阀的选型计算,最后对应用透气阀可能产生的“冷凝”现象进行了探讨并在典型环境下开展试验,结果表明,在动力电池上应用透气阀不会因“冷凝”现象出现积水而影响电池包的高压绝缘性,由此证明了防水透气阀在动力电池设计中应用的可行性。

摘要：本文利用非线性效应通过选取继电器磁系统可控因素的最佳水平组合,使继电器磁系统输出特性值的波动最小。由于输出特性与可控因素之间的数学模型不明确,所以这里我们采用正交试验的参数优化设计方法来研究可控因素与输出特性值的关系。最终通过选择磁系统中可控因素的最佳水平组合,来减少各种干扰的影响,使输出特性值波动小,稳定性好。

摘要：A high-efficiency propeller can enable a long mission duration for autonomous underwater vehicles(AUVs).In this study,a new method with OpenProp coupled with computational fluid dynamics was developed to design a propeller for an Explorer100 *** towed system simulation of the AUV was used to measure the nominal wake,and a self-propulsion simulation was used to measure the effective wake at the disc plane just in front of a *** propellers referring to the nominal wake(propeller 1)and effective wake(propeller 2)were designed with OpenProp and appended with the AUV for self-propulsion simulations,*** the numerical simulation of the AUV self-propulsion tests,the cruising velocity of AUV was *** flow characteristics of the self-propulsion in pressure and velocity contours were also *** propeller designed with an effective wake improved the thrust,velocity,and efficiency by approximately 11.3%,6.7%,and 2.5%,respectively,as compared with those with a nominal *** cruising velocity of the final designed propeller for the Explorer100 AUV improved by 21.8%,as compared to that of the original propeller from the AUV free-running tests.

摘要：以碱性溶液为萃取溶剂,运用响应面法对黑芝麻中的黑色素的提取工艺条件进行优化,从而得到较高色价值的黑芝麻黑色素。首先,对提取的黑芝麻色素进行紫外可见吸收光谱分析,找到其最大吸收波长。然后,在单因素实验的基础上,选择了提取温度、NaOH溶液浓度、提取时间和料液比为随机因子,以提取的黑芝麻色素的色价值为响应值,建立了四因素三水平Box-Behnken中心组合设计,并建立数学模型对响应值进行分析。结果表明,黑芝麻色素在228 nm处有最大吸收,最佳提取工艺参数为:提取温度30℃,NaOH溶液浓度11.4 g/L,提取时间20min,料液比为1∶3,酸化后的pH值为1.0,此时提取的黑芝麻色素的色价为326(228 nm)。