复合材料层合残余应力实验研究

取单向板90°试样用DMA法测出的玻璃化温度T_(?)为应力释放温度,用应变片包埋法测定了玻纤/648环氧复合材料单向试样与对称正交层板的热应变,用经典层板理论处理实验结果,实验值与理论值吻合;结果还表明,一般意义上的复合材料内的层合残余应力与制造过程中复合材料内的残余应力应作区别。     

多传感器信息融合技术

多传感器信息融合是Ｃ＾３Ｉ系统和电子综合战系统中的关键技术，本文从信息融合分类出发，讨论了单传感器的信息融合决策理论和技术以及多传感器信息融合原理，提出了多传感器信息融合专家系统，着重讨论贝叶斯法用于二元检测的分布式多传感器信息融合的检测方式。     

新媒体视域下系统构建“三位一体”公寓管理模式

随着科技日益进步和5G时代的即将到来,在治理体系上越来越注重管理与哲学教育相结合,高校作为接收新事物、新思维的前沿阵地。学生公寓成为大学生思想政治教育的又一个重要的阵地,因此创新公寓管理体系并努力做到使之与哲学相结合也成为了一项重大任务,高校辅导员、公寓辅导员、高校后勤管理人员结合新媒体创新学生公寓的管理方式对新时代大学生的教育、管理、服务掌控和开展思想政治教育工作至关重要。     

三角翼DBD等离子体流动控制研究进展

现代战机采用较多的三角翼，在大迎角绕流时存在前缘涡破裂等气动问题。作为新型主动流动控制技术，等离子体激励频带宽、响应快、结构简单、便于闭环控制，在解决三角翼气动问题上具有潜力。回顾了介质阻挡放电（DBD）等离子体气动激励的基本原理，及其用于三角翼前缘涡控制的研究进展。从来流条件、几何构型、激励参数等方面分析了DBD等离子体激励对流动控制效果的影响规律；结合不同激励频率下流场演化特性，分析了流动控制机理。最后，从理论研究和工程应用的角度，对三角翼前缘涡控制的发展进行总结展望。     

A comprehensive study of the 2016 Mw 6.0 Italy earthquake based on high-rate (10 Hz) GPS data

The 2016 M_w 6.0 Italy earthquake is successfully recorded by the near-field 10?Hz GPS and 200?Hz Strong Motion (SM) stations, providing valuable data for this study. A comprehensive study of this earthquake is carried out based on GPS data, which contains coseismic deformations analysis, noise analysis, seismic wave picking, and magnitude determination. The noise of most GPS-derived displacement waveforms can be described as a combination of white noise, flicker noise, and random walk noise after the earthquake occurrence, and the spectral indices vary significantly for most stations, implying that the seismic signals have affected the noise characteristic of GPS-derived displacement waveforms. S-transform is employed to assess the GPS capability to detect the seismic arrival time. The SM station AMT and the GPS station AMAT are in good agreement in seismic wave picking, and the difference is only 1.2?s in the north component, suggesting that the outcome of seismic wave picking using GPS data is reliable. Then, a classic empirical formula is employed to determine the moment magnitude. A robust moment magnitude (Mw 5.90) can be estimated by the nine GPS stations with about 23.9?s. If four GPS stations near the epicenter is chosen to determine the magnitude, it only take 13.0?s to retrieve a reliable preliminary (Mw 5.82) magnitude, which is 5.4?s ahead of nine stations. In addition, Cross Wavelet Transform (XWT) is adopted to measuring the correlation and phase relationship between GPS and SM records. The result of XWT analysis indicates 10?Hz GPS is capable of capturing reliable and accurate coseismic dynamic deformations, as evidenced by the XWT-based semblance being close to 1 between GPS and SM records. The above results confirm the capability of 10?Hz GPS to capture coseismic dynamic deformations, detect seismic arrival time, and determine earthquake magnitude. Moreover, rapid magnitude determination based on 10?Hz GPS data can be regarded as an important supplement to Earthquake Early Warning (EEW).     

李宏新发动机设计专家

作为长期从事飞机发动机研发工作的中航工业首席技术专家,请您谈一谈我国飞机发动机的研发现状以及需要攻克的难关。李宏新:航空发动机的研制是一个复杂的系统工程,研制道路充满艰辛和坎坷,不容丝毫懈怠和疏忽。     

A general calculation method to specify center-of-buoyancy for the stratospheric airship with multiple gas cells

As the lighter-than-air (LTA) flight vehicle, the stratospheric airship is a desirable platform to provide communication and surveillance services. During the ascent from sea-level to the mission altitude, the volume of the lifting gas may change significantly, which will result in the change of the center-of-buoyancy (CB). A general calculation method is developed to specify CB for the stratospheric airship with a double-ellipsoid hull and an arbitrary number of the gas cells. The cross-section-integral (CSI) method is used as a basic calculation scenario to specify CB. Considering the complexity in determining the boundary between the helium and air in the gas cell, a searching algorithm is put forward and the specification of CB can be conducted by the iterative calculation. As an important application, the stable condition of the pitch angle is analyzed when the change of CB is involved. Under different initial configurations, the stable pitch angle of the stratospheric airship during the ascent is specified and compared, which shows the advantages of the multi-gas-cell configuration. The results of this paper may provide an important reference for the engineering application of the stratospheric airship.     

平面近场测试中误差的分析

首先介绍了暗室中主要的误差项,然后通过实际测试的方式,分析了其中四项误差对超低副瓣天线-50dB副瓣的不确定度.结果对超低副瓣天线副瓣的误差分析有一定的参考意义,有助于天线设计师了解超低副瓣天线测试中误差项对副瓣的影响量级.     

探索在高职英语教学中渗透责任教育的方法

《国家中长期教育改革和发展规划纲要(2010-2020)》中明确提出把"着力提高学生服务国家和人民的社会责任感"作为全面实施素质教育的一个重要目标,由此说明责任教育的重要性。作为一名教师,利用课堂教学这个主渠道,通过在课程设计之中融入责任教育的内容、日常训练中培养责任心和自我负责能力以及完善管理机制等手段,对如何在高职英语教学中渗透责任教育做了一些尝试。实验证明,这不仅增强了学生学习的内驱力,而且提高了学生的职业素养。     

High temporal resolution global PWV dataset of 2005–2016 by using a neural network approach to determine the mean temperature of the atmosphere

Atmospheric water vapour plays an important role in phenomena related to the global hydrologic cycle and climate change. However, the rapid temporal–spatial variation in global tropospheric water vapour has not been well investigated due to a lack of long-term, high-temporal-resolution precipitable water vapour (PWV). Accordingly, this study generates an hourly PWV dataset for 272 ground-based International Global Navigation Satellite System (GNSS) Service (IGS) stations over the period of 2005–2016 using the zenith troposphere delay (ZTD) derived from global-scale GNSS observation. The root mean square (RMS) of the hourly ZTD obtained from the IGS tropospheric product is approximately 4 mm. A fifth-generation reanalysis dataset of the European Centre for Medium-range Weather Forecasting (ECMWF ERA5) is used to obtain hourly surface temperature (T) and pressure (P), which are first validated with GNSS synoptic station data and radiosonde data, respectively. Then, T and P are used to calculate the water vapour-weighted atmospheric mean temperature (Tm) and zenith hydrostatic delay (ZHD), respectively. T and P at the GNSS stations are obtained via an interpolation in the horizontal and vertical directions using the grid-based ERA5 reanalysis dataset. Here, Tm is calculated using a neural network model, whereas ZHD is obtained using an empirical Saastamoinen model. The RMS values of T and P at the collocated 693 radiosonde stations are 1.6 K and 3.1 hPa, respectively. Therefore, the theoretical error of PWV caused by the errors in ZTD, T and P is on the order of approximately 2.1 mm. A practical comparison experiment is performed using 97 collocated radiosonde stations and 23 GNSS stations equipped with meteorological sensors. The RMS and bias of the hourly PWV dataset are 2.87/?0.16 and 2.45/0.55 mm, respectively, when compared with radiosonde and GNSS stations equipped with meteorological sensors. Additionally, preliminary analysis of the hourly PWV dataset during the EI Niño event of 2014–2016 further indicates the capability of monitoring the daily changes in atmospheric water vapour. This finding is interesting and significant for further climate research.