Characteristics of low-latitude whistlers and their relation with f0F2 and magnetic activity

Some results obtained from the characteristics of low-latitude whistlers received at Wuchang (Geomag. Lat. 19.2°N), Zhanjiang (9.8°N) and Yulin (6.4°N) are presented. The observations cover three years at Wuchang, two years at Zhanjiang, one year at Yulin.     

Radio fine structures in dm–cm wavelength range associated with magnetic reconnection processes

Radio bursts with fine structures in decimetric–centimetric wave range are generally believed to manifest the primary energy release process during flare/CME events. By spectropolarimeters in 1–2 GHz, 2.6–3.8 GHz, and 5.2–7.6 GHz at NAOC/Huairou with very high temporal (1.25–8 ms) and spectral (4–20 MHz) resolutions, the zebra patterns, spikes, and new types of radio fine structures with mixed frequency drift features are observed during several significant flare/CME events. In this paper we will discuss the occurrence of radio fine structures during the impulsive phase of flares and/or CME initiations, which may be connected to the magnetic reconnection processes.     

Global aerodynamic design optimization based on data dimensionality reduction

In aerodynamic optimization, global optimization methods such as genetic algorithms are preferred in many cases because of their advantage on reaching global optimum. However, for complex problems in which large number of design variables are needed, the computational cost becomes prohibitive, and thus original global optimization strategies are required. To address this need, data dimensionality reduction method is combined with global optimization methods, thus forming a new global optimization system, aiming to improve the efficiency of conventional global optimization. The new optimization system involves applying Proper Orthogonal Decomposition (POD) in dimensionality reduction of design space while maintaining the generality of original design space. Besides, an acceleration approach for samples calculation in surrogate modeling is applied to reduce the computational time while providing sufficient accuracy. The optimizations of a transonic airfoil RAE2822 and the transonic wing ONERA M6 are performed to demonstrate the effectiveness of the proposed new optimization system. In both cases, we manage to reduce the number of design variables from 20 to 10 and from 42 to 20 respectively. The new design optimization system converges faster and it takes 1/3 of the total time of traditional optimization to converge to a better design, thus significantly reducing the overall optimization time and improving the efficiency of conventional global design optimization method.     

在制品管理中条码技术的应用

针对面向订单的单件、小批量生产制造企业,设计了一套条码数据采集系统,分析了主要运作流程和功能模块.在在制品的管理中提出了基于不同级别的工件生产状态定义,并给出了相应的加工、检验判定准则.经实际使用证明条码技术运用于工业现场是可行的.     

运动基航天飞行模拟器信号缩比策略

对于大幅值的输入信号,三阶多项式缩比法易产生信号畸变且参数配置复杂;而Hermite缩比函数法的触发速度较慢.提出两种改进的缩比方法:基于三阶多项式缩比法的最优参数配置法和加入线性缩比的非线性缩比法.前一种方法通过参数的优化配置最大化稳定区,以防止信号的畸变;后一种方法则利用线性缩比的特性将缩比度限制在稳定区内.仿真结果表明:线性缩比的加入可以防止三阶多项式缩比法信号的畸变;最优配置参数法应用方便且整体效果较好.为航天飞行模拟提供了更有效的缩比策略.     

Hale引理证明的修正

本文指出了著名的Ｈａｌｅ引理证明中的不足之处，并给以完善。     

热管式表面温度计检定装置

叙述一种热管式表面温度计检定装置的原理、结构。该装置可用于航天领域在实验室条件下对表面温度计的检定。     

不依赖于分布的置信水平范围的估计方法

在已知合成标准不确定和假定包含因子的条件下，Ｂｉｅｎｇｙｎｅ－Ｃｈｅｂｙｓｈｅｖ不等式给出了置信水平（或置信概率）的取值范围，这个结果不依赖于被测量的概率分布的具体形式。     

结构比强度及其在优化设计中的应用

本文从结构重量角度推导了比强度(含比模量)表达式,分析了对同一材料不同比强度的关系,给出了比强度在结构动态分析中及结构优化设计中的应用。