蒙城台磁变仪跳动及其原因的初探

2001－03－09蒙城地震台地磁磁变仪CB－3（观测仪，备份仪）同时出现三个分量动线的跳动，分析表明蒙城地震台地磁总强度F，垂直强度Z发生变化，其原因可能是强电流作用下，地下介质电性变化所致。     

扩散-离子色谱法测定植物样中的氟

采用扩散法提取植物样中的氟,用离子色谱法检测氟的含量。经试验,样品加标回收率在94.7%～104.7%之间,样品质量分数为7.10μg/g时,RSD为1.41%。此法操作简单,准确度高,精密度好,是一种测量植物样中氟含量的有效方法。     

我国局部网对近地测地卫星定轨精度的估计

本文利用模拟观测资料，估计了中国卫星跟踪网对近地测地卫星定轨和测定一些跟踪站地心坐标所能达到的精度。同时分析了近地卫星定轨的主要误差源，如大气模型、地球引力场模型的不确定性和跟踪网站坐标的误差等所产生的影响。     

广东省拖网网囊调查

为实施中华人民共和国国家标准《南海区拖网网囊最小网目尺寸》，对广东省范围内拖网网囊现状进行摸底调查，结果表明：广东省沿海拖网渔船现用网囊网目尺寸（内径）在16．7－35．2mm范围内，总体平均为27mm，均未能达到1989年国家技术监督局发布的中华人民共和国国家标准－《南海区拖网网囊最小网目尺寸）－内径39mm。     

The Doppler Effect and Spectral Energy Distribution of Blazars

The relativistic beaming model is adopted to discuss quantitatively the observational differences between radio-selected BL Lac objects (RBLs) and X-ray-selected BL Lac objects (XBLs), and between BL Lac objects and flat spectrum radio quasars (FSRQs). The main results are the following:(1) In the Doppler corrected color-color(αro^in-αox^in) diagram,XBLs and FSRQs occupy separated regions, while RBLs bridge the gap between them. These properties suggest that similar intrinsic physical processes operate in all the objects under a range of intrinsic physical conditions. (2) Our results are consistent with the results of Sambruna, Maraschi and Urry (1996) from other methods. We show the αxox introduced by Sambruna to be a good index for describing the energy distribution because it represents the intrinsic energy distribution and includes the Doppler correction. (3)The Doppler effect of relativistic beaming is the main mechanism, and the physical differences(such as magnetic fields, electron energies) are also important complementary factors for understanding the relation between XBLs and RBLS.