Long term variability of total ozone yearly minima and maxima in the latitudinal belt from 20°N to 60°N derived from the merged satellite data in the period 1979–2008

This paper deals with the behavior of the annual cycle of total ozone (ACO3) and its amplitude (O3_AMP) in the latitudinal belt from 20°N to 60°N. The prominent feature of the O3_AMP spatial pattern is the sharp maximum over the north-east coast of Asia. The spatial correlation of O3_AMP with its highest/lowest value varies with location: in the middle latitudes it correlates predominantly with the values of annual maxima of total ozone, while in the lower latitudes, there is a strong negative correlation with the values of ACO3 minima. Regarding temporal evolution of O3_AMP we detected distinct negative trend in the period of 1979–1995 which is caused by stronger negative trend of maxima than the negative trend of minima in ACO3. In the period 1995–2008 we found the positive trend of ACO3 in most regions due to stronger positive trend of maxima than that of minima in ACO3 in the middle latitudes (especially over the central and northern Europe and the north-east Asia). In the lower latitudes a weak negative trend of O3_AMP was identified and linked to weaker positive trend of maxima than positive trend of minima in ACO3. The behavior of the temporal trends was linked to the changes in Brewer–Dobson circulation and to the trends of tropopause pressure.     

灰色关联分析在民航使用困难报告（SDR）分析中的应用

针对国内多数民营航空公司较难量化地、有针对性地降低SDR某一类别或某几类事件的问题，提出可采用灰色关联分析方法对航空公司的SDR万时率和SDR次数进行分析，并给出了具体计算案例，为民营航空公司提供参考和借鉴。     

A data transmission scheduling algorithm for rapid-response earth-observing operations

With the development of rapid-response Earth-observing techniques, the demand for reducing a requirements-tasking-effects cycle from 1 day to hours grows rapidly. For instance, a satellite user always wants to receive requested data in near real-time to support their urgent mis- sions, such as dealing with wildfires, volcanoes, flooding events, etc. In this paper, we try to reduce data transmission time for achieving this goal. The new feature of a responsive satellite is that users can receive signals from it directly. Therefore, the traditional satellite control and operational tech- niques need to be improved to accommodate these changes in user needs and technical upgrading. With that in mind, a data transmission topological model is constructed. Based on this model, we can deal with the satellite data transmission problem as a multi-constraint and multi-objective path- scheduling problem. However, there are many optional data transmission paths for each target based on this model, and the shortest path is preferred. In addition, satellites represent scarce resources that must be carefully scheduled in order to satisfy as many consumer requests as possible. To efficiently balance response time and resource utilization, a K-shortest path genetic algorithm is proposed for solving the data transmission problem. Simulations and analysis show the feasibility and the adaptability of the proposed approach.     

外场飞机结构问题处理方法研究

针对外场飞机典型结构问题,论述了裂纹、磨损、腐蚀、掉钉、鸟撞、地面损伤等常见结构故障现象和易发生的部位,探讨了外场问题处理原则、思路、方法与流程及原位检测应考虑因素等,以达到问题定位准确、处理快速、措施得当的目的。     

民用飞机试飞规划与管理技术研究

梳理了通用的民机试飞需求类型,讨论了民机试飞任务分工和试飞计划制订原则,分析了民机试飞科目特点和逻辑关系,研究并提出了一种民机试飞任务优化方法,系统地阐述了试飞规划与管理体系,实现了民机试飞的闭环控制,解决了国内试飞规划中未能系统研究的问题,并创建了一套具有国际先进水平的民机试飞规划与管理系统(Flight Test Control System,简称"FTCS")。FTCS已在实际型号试飞工作中得到了验证和应用,起到了减少试飞架次和提高试飞效率的作用,具有实际的工程应用意义。     

空间近程高速相对运动方程的状态转移矩阵

分析了空间近程高速相对运动的特点,建立了描述近程高速相对运动的线性微分方程组,并给出了状态转移矩阵与解析解。仿真结果表明:对于HEO-GEO近程高速相对运动,所建方程的相对距离计算误差仅为16 cm,不足Hill方程计算误差的15%。所给出的状态转移矩阵对于实现空间目标拦截等任务的实时高精度相对导航和制导算法具有一定的应用价值。     

情景模拟教学法在《导游业务》教学中的应用

情景模拟教学法是以任务为导向,以培养学生能力为目标,互动仿真的教学方法。在高职《导游业务》教学中运用情景模拟教学法,就是通过让学生扮演旅游接待过程中的各种角色,进行模拟实操。这种教学方法不仅能够锻炼学生的表达能力,而且能够培养学生的应变能力和处理问题的能力。本文就情景模拟教学法在《导游业务》课程教学中的具体应用进行了探讨。     

美国载人航天商业运输的发展

研究了美国载人航天商业运输的发展现状和趋势。美国在取消星座计划之后,实施商业乘员和货物项目,将依靠商业运输器实现＂国际空间站＂的乘员和货物运输,以缩短＂后航天飞机＂时代（航天飞机退役后）运输的断档期。美国商业乘员和货物项目包括商业轨道运输服务（COTS）计划、商业再补给服务（CRS）计划和商业乘员开发（CCDev）计划...     

一种惯组外场标定振动干扰的分离方法

惯组在外场进行标定时常会受到地基振动的干扰,这种干扰会对惯组的测试精度造成极大的影响.为解决这一问题,根据工程实际需要,提出了一种基于经验模态分解和数字信号滤波技术相结合的惯组输出振动干扰分离方法.首先利用经验模态分解将受振动干扰的惯组输出分解成若干本征模态分量,然后采用低通滤波器对高频分量进行滤波,对低频分量相应区段做幅值修正,最后将处理过的各分量叠加,即重构出消除振动干扰的信号.相对于传统的剔除野值后的平滑滤波方法,新方法保证了数据信息的完整性,有效降低了振动干扰的不利影响,提高数据信息的可靠性和真实性.仿真实验和工程实践表明,该方法对外场的瞬时振动干扰有较强地分离能力.     

中部六省承接加工贸易转移问题研究

随着发达国家和我国东部沿海发达地区产业结构的调整，中部正在成为承接国际和东部沿海发达地区产业梯度转移的热土。尽管中部六省加工贸易逐年增长，但其整体规模和占贸易总额的比重，都远远低于全国的平均水平，这主要归因于中部六省运输成本、产业配套能力、物流效率、对外开放程度等因素的制约。因此，承接传统劳动密集型产业、培育新兴服务外包产业和发展地区优势特色产业是中部六省承接加工贸易梯度转移的首要选择。