2009年乌什-阿图什地震危险区异常跟踪

分析了乌什-阿图什地震危险区所处的柯坪块体地震时空活动特点:6级以上地震均沿块体边缘分布;6级地震时序分布不均匀,空间分布表现出轮回特征;6级地震前4级地震平静较为普遍,相关构造带以增强-平静为主要特征;响应地震的地点指示意义较为明确。文中还对危险区异常判定及2009年块体3次5级地震异常跟踪进行了总结。     

通用X射线衍射仪微机改造系统

详细分析了Ｘ射线衍射仪结构,介绍了改造此类仪器的方法,包括计算机接口设计和软件编程、安装等,整个展示系统的设计充分考虑了系统的安全性和操作的方便性。     

单向聚束质子激发X射线研究超导材料合成中的重力效应

采用质子激发Ｘ射线（ＰＩＸＥ）分析技术,以能量为２．０ＭｅＶ的质子束为激发源,利用单元四极磁透镜对带电粒子束的单向聚束本领,对超导材料样品ＣａＳｒ２Ｂｉ２Ｃｕ２Ｏ８进行了扫描ＰＩＸＥ分析,获得了其中元素Ｘ射线强度的垂向分布数据。在没有质子数数据参数的情况下,针对这种样品组成已知的特殊性,采用了内标迭代定量分析方法,获得了各元素的垂向浓度分布结果。强度和浓度数据均表明,元素Ｃａ主要分布在样品的顶部表层,证明人们关于超导材料合成过程中存在重力效应影响的推断是正确的。     

Relativistic Fe Kα features in the XMM‐Newton spectrum of the intermediate Seyfert galaxy 4U 1344‐60

We present the analysis of optical and X‐ray XMM‐Newton data of the source 4U 1344‐60. On the basis of the optical data we propose to classify 4U 1344‐60 as a Seyfert 1.5 galaxy and we measured a redshift value z = 0.012 ± 0.001. The observed X‐ray spectrum is complex. The continuum emission can be described as a power law obscured by two neutral absorption components. 4U 1344‐60 exhibits a broad and skewed iron line at 6.4 keV most likely originated in a few gravitational radius of an accretion disc. The analysis also reveals the presence of two narrow emission line‐like features at ∼4.9 keV and ∼5.3 keV. Assuming that hot spots on the surface of the accretion disc, orbiting very close to the black hole is responsible of these emission lines, the accretion disc would present an inclination of 20° and the active regions would be located in the 6–10 R _g radius range. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)     

层析成像二阶段射线追踪技术在工程中的应用

采用层析成像二阶段射线追踪技术,对混凝土构件的内部质量进行检测。在不损伤检测对象内部结构的前提下,用专用检测设备获取投影数据,并选用适当的数学模型和重建成像技术,反演检测对象内部未知物理量,生成二维、三维图像以重现检测对象的内部特征,提供混凝土构件测试断面上的完整信息,对缺陷做出详细的解释,提高测试精度。层析成像技术是病害检测技术发展的主流,此方法检测费用相对较低、速度快、检测信息丰富、检测手段多样化,应用前景广阔。     

信噪比检验法跟踪评估序贯平差质量研究

序贯平差有一套规律性很强的递推公式,易于编程实现且占用较小的内存,得到了广泛的实际应用。随着序贯进程的发展,观测信息不断丰富,使平差质量逐渐变好。本文对序贯平差质量跟踪检验问题进行了研究,提出了一种利用信噪比统计量,跟踪序贯平差过程评估中各待估参数估计质量的方法,并据此确定序贯平差进程的终止方式,在确保平差质量的同时有效地控制了计算的工作量。数值试验结果表明该方法合理有效,信噪比指标对序贯平差质量变化十分敏感。     

电离层残差对掩星反演温度精度的影响

本文以MSIS90大气模式和3D NeUoG电离层模式为大气背景,用三维射线追踪法模拟研究了太阳活动强度、地方时、掩星平面方位角对弯曲角电离层残差和温度电离层残差的影响,以及电离层残差对全球日平均温度的影响.结果表明：电离层残差是平流层顶部（35~50 km）和中间层底部（50~70 km）掩星大气温度反演的主要误差.在太阳活动活跃期,电离层残差对单一掩星事件的平流层顶部平均温度的影响可达1.8 K,中间层底部平均温度的影响可达7 K;对全球日平均温度的影响在平流层顶可达-0.6 K,在70 km高度处可达1.2 K.发展新的电离层改正方法或电离层残差修正算法对提高掩星大气反演精度和全球气候监测意义重大.     

雷暴激发的环状重力波在中高层大气中的传播特征

本文使用中国科学院国家空间科学中心——子午工程朔州观测站的全天空气辉成像数据,以及FY-2气象卫星云顶亮温数据（Black Body Temperature,TBB）,气象再分析数据和地闪数据,研究了2013年8月10日（LT）发生在内蒙古地区的雷暴活动激发的中高层环状重力波（Concentric Gravity Waves,CGWs）事件.根据最小二乘法的拟合结果和色散关系理论曲线,确定了激发中高层环状重力波的强对流系统,该对流中心位于内蒙古自治区中部（108.9°E,40.47°N）,重力波激发于雷暴初期,此时TBB低于220 K的深对流面积较小,随着时间的推移,该次雷暴活动越来越强,深对流面积在23：00达到最大,在23：30-24：00 LT时闪电频数最高,达到120.7 fl/min,随后深对流逐渐消散.在中高层87 km处OH（羟基）气辉层观测到的一次CGWs事件的两组波纹,分别沿水平方向传播了149.64 km和174.25 km,相应位置处的水平波长分别为12.67 km和16.75 km,周期分别为8.56 min和10.72 min,激发时间分别为19：34 LT和19：40 LT;随着水平传播距离的增加,CGWs水平波长增大.     

Mineral magnetic characterization of sediment sources from an analysis of lake and floodplain sediments in the catchments of the Old Mill reservoir and Slapton Ley,South Devon,UK

Research on suspended sediment transport in the catchments of the Old Mill reservoir and Slapton Lower Ley, South Devon, has attempted to discriminate changing catchment sources on the basis of downcore variations in the mineral magnetic properties of lake, reservoir and floodplain sediments. Here, we examine these downcore variations and also explore the variability in catchment sources and the influence of topographic controls on mineral magnetic signatures of topsoils and subsoils. Particle size controls on the mineral magnetic signatures are explored by an analysis of a fractionated sediment sample, whilst the possible impact of diagenesis is assessed by an examination of the Mn profiles in the lake and reservoir sediments. From this analysis it is evident that the mineral magnetic signatures of well sorted floodplain deposits are more likely to reflect the particle size composition of the transported material. By contrast, the mineral magnetic record in the sediment of Slapton Ley appears to be most strongly influenced by dissolution of magnetic minerals. The sediment of the Old Mill reservoir provides the only suitable record for the application of a simple mixing model which is developed in order to quantify changes in the relative contribution of topsoil and subsoil through time. The research has important implications for attempting to reconstruct sediment sources in highly eutrophic lakes and emphasizes the uncertainty in the application of simple mixing models. © 1998 John Wiley & Sons, Ltd.