二维系统一般模型的正实控制

本文研究的是二维系统一般模型的正实控制。本文的目的是针对该模型,设计一个状态反馈控制器,使得闭环系统是稳定的并且闭环传递函数是延展严格正实的,所得到的解是通过线性矩阵不等式给出,通过解决该线性矩阵不等式可获得期待的状态反馈控制器。最后,我们提供了一个数值算例来验证提到方法的有效性。     

签派员自我效能对工作压力源和幸福感的影响

以飞行签派员的工作角色压力源和工作幸福感为切入点，考察了飞行签派员工作压力源与工作幸福感之间的相关关系，并对飞行签派员的一般自我效能与工作压力源和工作幸福感的调节关系进行了探索。通过对309名民用航空飞行签派员进行的调查，使用相关分析与回归分析技术，发现飞行签派员工作角色压力源各维度（角色冲突、角色模糊和角色负载）与工作幸福感各维度（工作满意度、身体紧张和精神紧张）的相关系数分别在0．01水平上达到了显著，飞行签派员的工作压力源对飞行签派员的工作幸福感具有预测作用。结果显示，飞行签派员的一般自我效能感对角色冲突-工作满意度、角色冲突-精神紧张、角色负载-工作满意度、角色负载-身体紧张、角色负载-精神紧张之间的关系有显著的调节作用，而对角色模糊和工作幸福感各雏度之间的关系及对角色冲突-身体紧张之间的关系没有显著的调节作用。     

Love Waves in Layered Graded Composite Structures with Imperfectly Bonded Interface

Theoretical analysis and numerical calculations of Love wave propagation in layered graded composites with imperfectly bonded interface are described in this paper. On the basis of WKB method, the approximate analytic solutions for Love waves are obtained. By the interface shear spring model, the dispersion relations for Love waves in layered graded composite structures with rigid, slip, and imperfectly bonded interfaces are given, and the effects of the interface conditions on the phase velocities of Love waves in SiC/Al lay- ered graded composites are discussed. Numerical analysis shows that the phase velocity decreases when the defined flexibility parameter is greater. For the general imperfectly bonded interface, the phase velocity changes in the range of the velocities for the rigid and slip interface conditions.     

A multi-epoch study of the C IV absorption variability in the broad absorption line quasar APM 08279+5255

Broad absorption line (BAL) variability potentially represents a powerful tool to investigate the physical nature and the structure of gas outflows in active galactic nuclei. Most existing BAL variability studies rely on observations taken at a few epochs for samples of tens of BAL QSOs. In this study we present the first “monitoring” of a single object, APM 08279+5255, which has been observed more than 20 times since 2003. All available spectra from the literature have also been analysed, including two high resolution spectra, extending the time interval from 1998 to 2012. A relative stability of the shape of the absorption profile is found. At the same time significant variations of the equivalent width are observed. A correlation of the BAL equivalent width with the QSO luminosity is found for the first time. These results suggest that changes in the ionisation state of the gas are causing opacity changes.     

Low ionization lines in high luminosity quasars: The calcium triplet

In order to investigate where and how low ionization lines are emitted in quasars we are studying a new collection of spectra of the CaII triplet at λ8498, λ8542, λ8662 observed with the Very Large Telescope (VLT) using the Infrared Spectrometer And Array Camera (ISAAC). Our sample involves luminous quasars at intermediate redshift for which CaII observations are almost nonexistent. We fit the CaII triplet and the OI λ8446 line using the Hβ profile as a model. We derive constraints on the line emitting region from the relative strength of the CaII triplet, OI λ8446 and Hβ.     

飞机虚拟仪表建模仿真关键技术研究

将介绍虚拟仪表设计软件的设计思路和功能作用。首先介绍了现有的虚拟仪表设计方法，分析其优缺点；之后介绍自主研发的虚拟仪表设计软件的特点，分析设计思路，分解介绍各模块的功能，给出仿真案例及最后的仿真效果。该虚拟仪表设计软件完全自主研发，具有易用性、可迅速建模、容易更改，模块化，通用性等特点。     

飞机健康状况量化分析方法浅析

提出与飞机健康状况相关的事件参数、风险参数的概念，具体阐述了建立量化模型的思路和方法。该方法简单可靠，具有较强的可扩展性，可为飞机的技术派遣提供决策支持。     

基于通航飞机DA40维修演示系统的开发

提高通用航空器维修人员的业务水平,是通用航空事业快速发展的基本保障。为满足通用航空维修运行的需要,研发针对通用飞机的维修演示系统平台,可有效提高维修人员的学习效率,且具有广阔的社会效益和经济效益。系统基于DA40飞机维修手册和维修培训教学大纲开发,能较好地测试演示系统各项功能的完整性,具有广泛的示范意义。     

先进通用飞机航电系统概述

阐述了通用飞机航空电子系统的发展及其综合化的系统架构,介绍了Smart Deck系统和Top Deck系统这两款先进通飞航电系统的设计特点、系统架构以及两款先进系统的共性,最后对通用飞机航电系统的发展提出了一些展望。     

轻型通用飞机起飞总重估算方法研究

飞机的起飞总重是飞机的重要设计参数,概念设计阶段首先要做的重要工作之一就是确定飞机的起飞总重。以四人座低速活塞螺旋桨飞机为例,采用任务剖面法和商载航程法分别对起飞总重进行了估算,并对两种方法进行了修正,在此基础上,取两个计算结果的平均值作为最终的起飞总重估算值。通过与对比机型的比较,验证修正后的计算方法和结果是准确合理的,为通用飞机起飞总重的确定和选择提供了参考。