浅析RNP AR技术的发展与应用实例

2020年6月24日,深航ZH9803航班的顺利落地,标志着RNP AR飞行程序在苏南硕放机场正式投入运行,苏南硕放机场周边空域环境复杂、军民航飞行矛盾突出,空域使用严重受限,但是通过实施RNP AR程序,成功地将传统需要降落的五边距离由17公里缩短到了3.7公里,使得苏南硕放机场成为国内采用最短五边实施RNP AR进近的机场。该文主要是基于RNP AR技术的发展以及如何通过RNP AR技术来解决苏南硕放机场空域限制的难题进行了阐述,目的是进一步推动我国民航事业的进步与发展。     

国航飞行员网上准备系统的设计与实现

介绍了中国国际航空公司飞行人员网上准备系统的应用和基本功能,讨论了该系统的技术实现方法,包括具体通用功能组成模块、底层系统支持等,阐述了网上准备方式对保障飞行安全的作用。     

空间飞行对番茄种子活力的影响

以美国航空航天局（ＮＡＳＡ）提供的经空间飞行处理的番茄种子（ＳｅａｃｅＥｘｐｏｓｅｄＳｅｅｄ，ＳＥＳ）和地面对照种子（Ｅａｒｔｈ—ｂａｓｅｄＳｅｅｄＥＢＳ）为材料，研究了空间飞行对番茄种子发芽力和幼苗生长的作用。结果表明，ＳＥＳ发芽迅速、均匀，其发芽势和发芽率分别比ＥＢＳ高２６．５％和５．３％．表现出较强的发芽力；发芽后５ｄＳＥＳ的芽长和根长分别是ＥＢＳ的２．４倍和２．７倍，活力指数是ＥＢＳ的４．１倍，表明空间飞行可显著提高番茄种子的活力。     

一种基于频率变化线的飞机振源分析方法

对于飞行试验中非平稳振动信号,进行时频分析后仅可定性的观察到频率值随时间发生变化的趋势,为了确定振源机理,需要进一步寻求频率变化与飞行参数变化之间的相关性.提出了一种把所关注频率值的变化曲线从时频分析图中提取出来的方法,以定量的研究引起频率值变化的原因.针对某型机平飞状态出现的垂尾尖部振动较大现象,运用此方法提取频率变化线,通过与发动机参数的对比与拟合,确认了该振动产生的振源来自发动机的高压转子.     

意大利蜜蜂(Apis mellifera L.)飞翔肌发育过程中线粒体的形态与发生

意大利蜜蜂飞翔肌发育过程中的线粒体是多种多样大小不一的,由生理功能需求而定。观察结果表明,意大利蜜蜂飞翔肌线粒体的发生有两条途径:①重新形成,即由肌质分泌出来的蛋白质和脂肪自发装配而成;②由现有线粒体复制出双层膜囊,再形成新的线粒体。这是飞翔肌线粒体发生的独特之处。     

The effect of westward travel across five time zones on sleep and subjective jet-lag ratings in athletes before and during the 2015’s World Rowing Junior Championships

This study examined sleep-wake habits and subjective jet-lag ratings of 55 German junior rowers (n = 30 male, 17.8 ± 0.5 years) before and during the World Rowing Junior Championships 2015 in Rio de Janeiro, Brazil. Athletes answered sleep logs every morning, and Liverpool John Moore’s University Jet-Lag Questionnaires each evening and morning. Following an 11-h westward flight with 5-h time shift, advanced bedtimes (?1 h, P < .001, η_p² = 0.68), reduced sleep onset latency (P = .002, η_p² = 0.53) and increased sleep duration (P < .001, η_p² = 0.60) were reported for the first two nights. Jet-lag symptoms peaked upon arrival but were still present after 6 days. Sleep quality improved (P < .001, η_p² = 0.31) as well as some scales of the Recovery-Stress Questionnaire for Athletes. Participation was successful as indicated by 11 of 13 top 3 placings. Overall, the initial desynchronisation did not indicate negative impacts on competition performance. As travel fatigue probably had a major effect on perceptual decrements, sleep during travel and time to recover upon arrival should be emphasised. Coaches and practitioners should consider higher sleep propensity in the early evening by scheduling training sessions and meetings until the late afternoon.     

一种无人直升机定高飞行控制系统的设计与仿真

为提高无人直升机定高飞行控制系统稳定性和快速性,通过建立无人直升机动力数学模型,在模型指导下调整控制器参数,提高闭环系统的控制性能,并用MATLAB完成系统仿真,通过性能评估与串联、反馈校正,提高系统性能指标,改善无人直升机定高飞行品质,该方法可有效减小建模工作量和难度,直观表现无人直升机的定高飞行控制过程.     

袁柯霞跳马踺子转体180°前手翻屈体前空翻动作的运动学分析

踺子转体180°前手翻前空翻类动作是跳马项目近几年来开发的一类高难度动作，从当前发展趋势看，此类动作发展潜力很大，将成为新的潮流动作。袁柯霞是我国完成踺子转体180°前手翻屈体前空翻动作质量比较好的运动员。研究她完成此动作的运动学规律及主要技术特征，对有条件发展此类动作的运动员具有理论和实际运用价值。     

航天诱变凤仙花SP2代光合作用研究

对经过航天诱变的凤仙花SP2代的10个实验组与没有经过航天诱变的6个对照组植株的光合特性进行了比较.测得了光合速率等12个指标,进行相关分析发现:实验组中光照强度和光合速率呈极显著正相关,胞间CO2浓度和光合速率呈极显著负相关.对照组中,光照强度和光合速率正相关,胞间CO2浓度和光合速率为负相关.还对实验组以及对照组植株的光合色素含量等生理指标进行了测定,结果实验组光合色素含量大增,特别是叶绿素a含量增加更显著,叶绿素a与叶绿素b的比值也增大,而其可溶性糖含量极大地减少.本实验结果表明:航天诱变能对凤仙花的光合特性和生理生化方面产生显著且可遗传影响,能显著提高其光合能力.     

The flying classroom – a cost effective integrated approach to learning and teaching flight dynamics

In the UK, the Royal Aeronautical Society recommends the inclusion of practical flight exercises for accredited undergraduate aerospace engineering programmes to enhance learning and student experience. The majority of academic institutions teaching aerospace in the UK separate the theory and practice of flight dynamics with students attending a series of lectures supplemented by an intensive one-day flight exercise. Performance and/or handling qualities flight tests are performed in a dedicated aircraft fitted with specialist equipment for the recording and presentation of flight data. This paper describes an innovative approach to better integrate theory and practice and the use of portable Commercial-off-The-Shelf (COTS) technologies to enable a range of standard, unmodified aircraft to be used. The integration of theory and practice has enriched learning and teaching, improved coursework grades and the student experience. The use of COTS and unmodified aircraft has reduced costs and enabled increased student participation.