Observations of Extended Radio Emission in Clusters

We review observations of extended regions of radio emission in clusters; these include diffuse emission in ‘relics’, and the large central regions commonly referred to as ‘halos’. The spectral observations, as well as Faraday rotation measurements of background and cluster radio sources, provide the main evidence for large-scale intracluster magnetic fields and significant densities of relativistic electrons. Implications from these observations on acceleration mechanisms of these electrons are reviewed, including turbulent and shock acceleration, and also the origin of some of the electrons in collisions of relativistic protons by ambient protons in the (thermal) gas. Improved knowledge of non-thermal phenomena in clusters requires more extensive and detailed radio measurements; we briefly review prospects for future observations.     

辐射变色薄膜剂量计性能测试及加速器应用

本课题的目的是建立用于辐射加工高剂量水平吸收剂量测量的辐射变色薄膜剂量计。通过系统研究,批量制备了以尼龙为基材,副品红氰化物为染料的辐射变色薄膜剂量计。为了验证批制辐射变色薄膜剂量测量的可靠性,选择了国际上应用较广的FWT-60膜及丙氨酸薄膜剂量计与本实验室批制的辐射变色薄膜开展实验室内剂量比对,比对结果均在±4%内符合,归一化偏差En绝对值均小于1。通过在加速器上进一步应用实验表明批制辐射变色薄膜可用于电子束辐照参数测量。     

铁氧体基片微带线的谱域导抗法分析

铁氧体薄膜器件在微波和毫米波集成中有着广泛地应用。本文首次将T.Itoh提出的谱域导抗法的分析推广到铁氧体基片微带线结构。通过对麦克斯韦方程的坐标旋转和傅里叶变换,导出铁氧体介质的波导纳,利用边界条件,忽略TE和TM波的耦合后,用一网络等效表示铁氧体基片微带线,从而借助于谱域导抗法进行特性分析。本文对铁氧体基片微带线的色散特性进行了数值计算,并讨论了微带线的各种参数对色散特性的影响。     

激光吸收法辐射测温技术研究

对辐射测温技术的发展进行了回顾,总结了辐射测温中遇到的主要问题,分析了激光吸收法辐射测温技术的发展现状,对激光吸收法辐射测温技术的理论模型进行了公式推导,对本单位建立的实验装置及其测温结果进行了介绍。     

The INTEGRAL view of Gamma-Ray Bursts

After more than six and half years in orbit, the ESA space observatory INTEGRAL has provided new, exciting results in the soft gamma-ray energy range (from a few keV to a few MeV). With the discovery of about 700 hard X-Ray sources, it has changed our previous view of a sky composed of peculiar and “monster” sources. The new high energy sky is in fact full of a large variety of normal, very energetic emitters, characterized by new accretion and acceleration processes (see also IBIS cat4 (Bird et al., 2010). At the same time, about one GRB/month is detected and imaged by the two main gamma-ray instruments on board: IBIS and SPI. In this paper, we review the major achievements of the INTEGRAL observatory in the field of Gamma-Ray Bursts. We summarize the global properties of Gamma-Ray Bursts detected by INTEGRAL, with respect to their duration, spectral index, and peak flux distributions. We recall INTEGRAL results on the spectral lag analysis, showing how long-lag GRBs appear to form a separate population at low peak fluxes. We review the outcome of polarisation studies performed by using INTEGRAL data. Finally, concerning single GRB studies, we highlight the properties of particularly interesting Gamma-Ray Bursts in the INTEGRAL sample.     

基于无人机的天线测量系统研究

在天线测量领域,为了评估天线在实际工作环境中的性能,现场天线测量技术受到越来越多的关注,借助无人机对天线性能指标进行现场测试评估的技术在近年来取得了显著进展。当前无人机天线测量系统可以分为两种：一种是在满足远场条件下直接测量天线方向图、增益等指标,一种是在近场测量后进行数据变换获得远场天线指标。本文总结了基于无人机的天线测量系统研究现状,提出一种外场无人机测量方案,通过S波段标准增益喇叭天线辐射方向图外场测试实验,验证了系统的可行性,进一步对测量误差进行了分析。     

电磁兼容设计中金属屏蔽镀（涂）层的选用

叙述了在电磁兼容设计中，在选用金属镀（涂）层作电磁屏蔽层时应考虑的因素。强调了屏蔽材料防气候环境条件腐蚀以确保电磁屏蔽性能长期可靠的重要性。分别介绍了针对各种材料制作的蜂窝屏蔽通风板、机壳、屏蔽网、垫片等电子仪器零部件选用的屏蔽镀（涂）层。     

填充型电磁屏蔽复合材料

介绍了电磁辐射的危害以及发展电磁屏蔽材料的意义,阐述了电磁屏蔽的原理。综述了导电填料的种类、形态、填充量、复配、分散与分布等因素对填充型电磁屏蔽复合材料屏蔽效能的影响及研究进展。     

日冕扰动传播的数值模拟——(Ⅱ)热传导和辐射的影响

利用包含完全能量方程的磁流体力学方程组,数值研究了磁静力平衡基态下由于日面冷物质径向喷射所引起的日冕动力学响应。这些结果可以解释日珥的形成及伴随的日冕扰动传播。结果还表明,热传导和辐射损失对扰动传播的基本性质影响很小;对于日珥的形成,也未显出重要作用。      

气象卫星扫描辐射计的辐射定标

阐述了气象卫星扫描辐射计的辐射定标。包括卫星发射前的地面定标,飞行中的星上定标及星地对比定标。指出飞行中的可见光波段的定标至今还未能投入业务使用,仍处于研究阶段,而静止气象卫星的飞行中定标,无论红外或是可见光波段只能做到相对定标。为解决绝对定标问题,必须寻求星体外的客观目标作为定标源。采用这一途径,即使星上定标设备失效,也不致影响卫星数据的使用。