Simulation of the MELiSSA closed loop system as a tool to define its integration strategy

Inspired by a terrestrial ecosystem, Micro-Ecological Life Support System Alternative (MELiSSA) is a project focused on a closed-loop life support system intended for future long-term manned missions (Moon and Mars bases). Started by the ESA in 1989, this 5-compartment concept has evolved through a mechanistic engineering approach designed to acquire both theoretical and technical knowledge. In its current state of development, the project can now start to demonstrate the MELiSSA loop concept at pilot scale. Thus, an integration strategy for a MELiSSA Pilot Plant (MPP) has been defined, describing the different test phases and connections between compartments. The integration steps are due to be started in 2008 and completed with a complete operational loop in 2015. The ultimate objective is to achieve a closed liquid and gas loop fulfiling 100% of oxygen requirements and at least 20% of food requirements for one-man. Although the integration logic could start with the most advanced processes in terms of knowledge and hardware development, this logic needs to be expanded to encompass a high-level simulation policy. This simulation exercise will make it possible to run effective demonstrations of each independent process, followed by progressive coupling with other processes in operational conditions mirroring as far as possible the final configuration.     

高超声速飞行器末端导引与控制一体化研究

针对高超声速飞行器末制导阶段参数不确定性和耦合性强的特点,提出了导引与控制协调的一体化设计思路,建立了非线性受扰动的导引与控制一体化控制模型。结合自适应比例导引律特点,通过分段对模型简化,降低了控制律的设计难度。针对气动模型非线性不精确问题,给每段设计了鲁棒自适应BackStepping滑模控制器,再将各段控制律在时间上融合。针对控制回路饱和与延迟特性,提出一种将导引指令缩放和相位提前的修正方法。仿真结果表明,所提方法可行有效,鲁棒性强。     

论秦国功利主义价值观

秦国功利主义价值观的形成,有着深刻的社会原因、历史原因和思想原因。秦国功利主义价值观具体表现在政风、战风、民风和学风诸方面。秦国功利主义价值观促进了秦国的发展壮大和统一事业的完成,但也加剧了秦国国内人际关系的冲突和关东、关西两大区域的对抗,最终导致了秦王朝的灭亡。     

Performance evaluation of some rain rate conversion models for microwave propagation studies

An important characteristic of rainfall levels at a particular place is the statistical distribution of rainfall rate. In this paper, 5-min integration time rainfall data for the Northcentral region of Nigeria was obtained from the Tropospheric Data Acquisition Network (TRODAN), Anyigba, Nigeria. Also, 1-min integration time rainfall was measured at Minna, Nigeria. In order to obtain the optimal rain rate model suitable for this region, two globally recognised rain rate models were critically evaluated and compared with the 1-min measurements. These are the ITU-R P.837-7 and Lavergnat-Gole (L-G) models. The results obtained showed that the ITU-R P.837-7 and L-G models respectively underestimated the measured rain rate by 7.3 mm/h and 9 mm/h at time percentage exceedance of 0.1%, while they underestimated the measured rain rate by 23.4 mm/h and 13 mm/h respectively at 0.01%. At 0.001%, the measured rain rate was overestimated by the ITU-R P.837-7 and L-G models by 27.4 mm/h and 3 mm/h respectively. Further performance evaluation of the predefined models was carried out using different error metrics such as sum of absolute error (SAE), mean absolute error (MAE), root mean square error (RMSE), standard deviation (STDEV) and Spearman’s rank correlation. The results obtained adjudged the Lavergnat-Gole model as the best rain rate prediction model for this region.     

高职《商务英语》课程"教、学、做"一体化教学模式的探索与实践

“教、学、做”一体化教学模式是教学中理论与实践的有机结合,在《商务英语》课程教学中具有重要的意义,其模式可以从“教师怎样教”、“学生怎样学”、“学生怎样做”三个角度进行系统的构建,以提高学生的职场竞争力。     

增材制造技术在航空航天金属构件领域的发展及应用

受传统制造工艺的限制,航空航天产品一直存在生产周期长、制造成本高、减重困难等问题,迫切需要开发出航空航天产品高效快速研制方法。与传统制造工艺相比,增材制造技术以其完全不同的制造理念迅速成为制造技术领域的新方向。阐述了金属增材制造(激光/电子束/电弧)技术种类、优势、深入研究和成果应用。     

航天器故障诊断和预测天地一体化集成系统

在轨航天器和地面航天飞控中心天地2个系统缺乏相互支持和配合,是导致对航天器故障诊断和预测能力不足的重要因素之一。为了提高航天器故障诊断和预测的有效性、可靠性和准确性,需要将天地2个系统集成为一个整体（天地一体化系统）。设计了航天器故障天地一体化集成诊断和预测系统,讨论了航天器故障天地一体化集成诊断和预测方法,对航天器故障天地一体化集成诊断系统和方法的特点进行了分析。将天地2个系统集成在一起对航天器故障进行诊断和预测,其效率、准确性和可靠性较高。     

典型布局的进气道/导弹一体化性能分析

对头部进气、颌下进气、二元（两侧）进气三种典型布局的进气道/弹体一体化性能进行了计算,就阻力系数而言,颌下及头部进气优于两侧进气,升力系数则恰好相反。头部进气的流量系数最高,颌下次之,两侧进气则最差。对不同布局的总压恢复系数进行比较,颌下及两侧进气则较头部进气有好的攻角特性。     

量子级联技术研究进展：从光源到探测

量子级联技术基于多量子阱或超晶格结构中的子带跃迁和共振隧穿理论,既可以产生光源,又可以探测光信号,是量子级联激光器（QCL）和量子级联探测器（QCD）的理论基石,在检测、遥感、通信、雷达等领域具有广泛的应用前景。经过最近三十年的研究,量子级联技术在基础研究、产品性能以及应用系统研发和场景试验方面都取得了重大进展。本文首先简要介绍了量子级联技术的原理和发展历史,随后阐述了量子级联器件子带能级结构和电子输运动力学计算思路,接着重点综述了量子级联技术的研究进展,包括中远红外高功率QCL、中远红外宽调谐QCL、太赫兹QCL、高性能QCD,以及QCL和QCD的单芯片光子集成方面的内容,最后介绍了QCL和QCD的产品与应用情况。     

飞行动力学系统一体化实时仿真技术研究

给出了一个工程研究型的飞行动力学特性一体化实时仿真软件包，验下了可行性。结果表明，该软件包具有一体化、多功能、通用性强、数学模型库较完备、易扩充开发、仿真精度和效率高、实时性较好、用户界面友好等特点，是一个多层次高效率综合研究飞行动力学特性的仿真工具。仿真应用的研究结果，可用于飞机重装空投飞行特怀之研究。为适应国内微机一体化仿真之需要，可在微机及微机为主控处理机的仿真器运行，对提高现有微机的实时仿