试论引进教材与国内教材的合理使用

教材作为高校系统授课的重要资料,它是依据教育的目标与内容所编著的,有利于教学活动的展开和学生的学习与掌握.当前在外语院校的教学中,引进教材和使用国内原版教材已成为一种趋势,但是实现二者阃的互补,注重引进教材中存在的问题,结合实际,为我所用,才能起到培养应用型人才的目的.     

Multi-function radar emitter identification based on stochastic syntax-directed translation schema

To cope with the problem of emitter identification caused by the radar words＇ uncertainty of measured multi-function radar emitters, this paper proposes a new identification method based on stochastic syntax-directed translation schema（SSDTS）. This method, which is deduced from the syntactic modeling of multi-function radars, considers the probabilities of radar phrases appearance in different radar modes as well as the probabilities of radar word errors occurrence in different radar phrases. It concludes that the proposed method can not only correct the defective radar words by using the stochastic translation schema, but also identify the real radar phrases and working modes of measured emitters concurrently. Furthermore, a number of simulations are presented to demonstrate the identification capability and adaptability of the SSDTS algorithm.The results show that even under the condition of the defective radar words distorted by noise,the proposed algorithm can infer the phrases, work modes and types of measured emitters correctly.     

Parallel Distributed CFAR Detection Optimization Based on Genetic Algorithm with Interval Encoding

Aiming at parallel distributed constant false alarm rate (CFAR) detection employing K/N fusion rule, an optimization algorithm based on the genetic algorithm with interval encoding is proposed. N-1 local probabilities of false alarm are selected as optimization variables. And the encoding intervals for local false alarm probabilities are sequentially designed by the person-by-person optimization technique according to the constraints. By turning constrained optimization to unconstrained optimization, the problem of increasing iteration times due to the punishment technique frequently adopted in the genetic algorithm is thus overcome. Then this optimization scheme is applied to spacebased synthetic aperture radar (SAR) multi-angle collaborative detection, in which the nominal factor for each local detector is determined. The scheme is verified with simulations of cases including two, three and four independent SAR systems. Besides, detection performances with varying K and N are compared and analyzed.     

Long-period meteor radar temperature variations over Collm (51°N, 13°E) and Kazan (56°N, 49°E)

We have estimated temperatures from meteor radar measurements using the gradient method and the full width at half maximum method over Kazan (56°N 49°E) and Collm (51°N, 13°E). The time series cover the period 2016–2019. The temperature gradient model is constructed from SABER temperature observations. We demonstrate that annual mean, amplitudes and phases of the annual and semiannual oscillations of the radar temperatures are close to those of the MLS and SABER temperatures. The annual mean temperatures over Kazan and Collm differ non-significantly. The seasonal variability of the radar temperature is mostly due to the annual cycle which tends to grow with latitude. The gradient method produces temperatures which agree with the SABER temperatures better than with the MLS ones. The harmonics of the annual oscillations from periods of 73 days up to periods of about 40 days are the most significant day-to-day temperature oscillations and have zonal wavenumber zero. Their periods and phases are in good correspondence with those of the MLS and SABER ones. We also show some results which demonstrate that at 56°N the FWHM method is not as robust as the gradient method.     

Connection between winter mesopause region temperatures and diurnal LF reflection height variations measured at Collm

Scale height, H, estimates are calculated from the decrease/increase of ionospheric virtual reflection heights of low-frequency (LF) radio waves at oblique incidence in suitably defined morning intervals around sunrise during winter months. The day-to-day variations of H qualitatively agree with daily mean temperature variations around 90 km from meteor radar measurements. Since mesospheric long-period temperature variations are generally accepted to be the signature of atmospheric planetary waves, this shows that LF reflection height measurements can be used for monitoring the dynamics of the upper middle atmosphere. The long-term variations of monthly mean H estimates have also been analysed. There is no significant trend, which is in agreement with other measurements of mesopause region temperature trends.     

电大尺寸开口腔体RCS的SBR并行计算

文章利用消息传递协议MPI开发了针对电大尺寸开口腔体单站雷达截面(RCS)的射线弹跳法(SBR)并行计算程序。程序采用按照RCS计算角度间隔分配计算任务的大粒度并行计算方法,取得了较高的并行计算效率,大大减少了电大尺寸开口腔体的RCS计算时间。算例计算结果与文献吻合良好。     

复合材料电搭接分析

电搭接是指用金属编织线或金属片将机载设备的外壳与飞机基本结构连接起来,使两者处于一个共同的电位点。飞机上采用复合材料后,由于复合材料与金属之间电性能的差异,在GJB358-87中规定的搭接电阻值就不完全适用。本文在研究了大量国内外资料的基础上,根据国内目前的技术水平,对安装在复合材料结构上的机载设备,按不同的电搭接功能要求,提出了合适的搭接电阻值。     

T250与30CrMnSiA异种材料焊接工艺技术

从冶金方面分析了T250与30CrMnSiA材料焊接工艺性。通过手工钨极氩弧焊焊接工艺研究试验,选择焊丝材料,确定材料焊接状态,制定了合理有效的焊接工艺规范和措施。采用光学金相显微镜、维氏硬度测试和力学性能检测等手段,对T250与30CrMnSiA异种材料焊接接头金相组织、力学性能和显微硬度等方面进行详细分析。结果表明,T250和30GrMnSiA异种材料具有良好的焊接性,填充HT250焊丝,采用热输入量较小的焊接电流进行焊接,接头强度与30GrMnSiA材料强度相当。     

太赫兹雷达信号无源侦察技术研究

简要介绍太赫兹波的特性和性能,概述了太赫兹技术在雷达领域的主要应用及技术特点.提出太赫兹雷达信号无源侦察系统的原理框图,讨论太赫兹源、太赫兹混频器和太赫兹滤波器等主要太赫兹器件,分析太赫兹雷达信号无源侦察的关键技术.     

手征媒质的手征参量ξc对反射特性的影响

利用传输线理论 ,分析金属衬底的单层手征介质与自由空间的分界面上电磁波垂直入射时 ,ξc数值的变化对媒质反射特性的影响。计算结果及部分实验结果表明 :在媒质中掺杂手征微结构的浓度增加 ,等效于ξc 的实部与虚部同时变化。分别改变ξc的实部与虚部 ,结果发现 ,手征参数ξc的虚部调整在最佳值时 ,会在某一频率点上取得最小反射率 ;而随着ξc的实部增加 ,最小反射频率减小。由此得出结论 ,在设计手征吸波媒质时 ,可以通过优化设计 ξc的实部、虚部的值 ,来实现在某一波段上较佳的吸波特性。