With the accelerating global transition toward sustainable aviation, the development and deployment of alternative aviation fuels have emerged as a critical research priority. For countries with a shortage of oil and gas resources, biomass-derived and coal-based synthetic fuels are positioned to enhance aviation fuel supply security through diversified production pathways. To promote the development of aviation alternative fuels, this paper provides a systematic discussion and analysis of the feedstock sources, production process flows, the types of feedstocks and product compositions suited to different process flows, their performance characteristics, and the permissible blending ratios with petroleum-based fuels for biomass and coal-based alternative fuels. Existing issues within various production processes are also explored, and research hotspots are identified, providing a comprehensive summary. Based on the rich sources of raw materials for alternative fuels, strategic recommendations are proposed: establishing biomass alternative fuel production enterprises using the “oil-to-fuel” method around central cities, developing production facilities in agrarian-based cities utilizing agricultural residues as raw materials, and vigorously promoting coal-based alternative fuels to leverage the country’s extensive coal resources fully. These strategies aim to provide valuable references for the production and application of domestic aviation alternative fuels.
针对紧急救援物资、特殊物资需要较高的运输效率,采用物流无人机进行物资运输可大大降低运输时间,提高物流效率.基于卫星互联网(Ka频段),视情集成现有北斗、ADS-B、4G/5G等手段,该物流无人机管控系统能够实时获取物流无人机飞行状态,实现物资的资源保障、数据记录、智能跟踪、智能订单结算等功能,满足军民航等相关主管部门、物流运营企业、公众等用户需求.该无人机管控系统的应用有助于推动我国无人机物流产业的发展.
空中交通流量的急剧增加使得空域运行复杂度持续加大,迫切需要空管的智能化改进.冲突探测与解脱是空管的核心组成部分,前期研究初步证实了使用强化学习方法进行冲突解脱智能决策生成的可行性.针对关键的奖励函数设计环节,本文首先介绍了使用强化学习进行冲突解脱的运行框架,然后对国内外研究中使用的奖励函数进行归纳和分析,最后给出了冲突解脱强化学习方法的奖励函数设计准则与建议.希望通过本文给研究者以启发,优化智能冲突解脱关键环节,促进智慧空管落地应用.
合理选择巡航速度能有效降低航空公司总成本.本文使用某国产民机空气动力学数据,建立动力学模型及经济速度计算方法,使用机组操作手册提供的数据进行校验,最大误差小于1％,计算结果可信.同时分析了成本指数、飞机重量、大气温度、风向风速和飞机重心对该机型经济速度的影响,为航空公司制作最小运行成本飞行计划提供理论依据和数据支持.
本文分析了"教学模式"的概念和当前大学英语的教学现状,然后围绕新教学模式改革,分析了"对分课堂"新型教学模式指导下的大学英语教学内容与教学方法,提出一系列的具体举措,对提升学生学习积极性、课堂参与度和口语能力有借鉴意义.
