GPS接收机噪声对天线相位中心检测的影响分析

利用四天的零基线观测数据，截取不同时间长度的数据段，解算出北方向、东方向、高程方向的偏差量△N、△E、△U，对这些偏差量进行统计分析和误差分析。     

Determination of Antibiotic Residues in Manure,Soil, and Surface Waters

In the last years more and more often detections of antimicrobially active compounds (“antibiotics”) in surface waters have been reported. As a possible input pathway in most cases municipal sewage has been discussed. But as an input from the realm of agriculture is conceivable as well, in this study it should be investigated if an input can occur via the pathway application of liquid manure on fields with the subsequent mechanisms surface run‐off/interflow, leaching, and drift. For this purpose a series of surface waters, soils, and liquid manures from North Rhine‐Westphalia (Northwestern Germany) were sampled and analyzed for up to 29 compounds by HPLC‐MS/MS. In each of the surface waters antibiotics could be detected. The highest concentrations were found in samples from spring (300 ng/L of erythromycin). Some of the substances detected (e.g., tylosin), as well as characteristics in the landscape suggest an input from agriculture in some particular cases. In the investigation of different liquid manure samples by a fast immunoassay method sulfadimidine could be detected in the range of 1…2 mg/kg. Soil that had been fertilized with this liquid manure showed a content of sulfadimidine extractable by accelerated solvent extraction (ASE) of 15 μg/kg dry weight even 7 months after the application. This indicates the high stability of some antibiotics in manure and soil.     

2002年上半年全球地震活动

2002年上半年，全球发生MW≥6．5地震16次，其中13次浅源地震，2次中源地震，1次深源地震；发生MW≥7．0地震6次。上半年MW≥7．0地震的地震矩释放是1976年以来的偏低水平。中国及邻区地震活动比较活跃：3月3日，在兴都库什地区发生了1次MW7．3中源地震；6月28日，在中国吉林汪清发生了1次MW7．3深源地震。统计检验表明，地震矩释放表现出持久性质。     

底层框架砌体建筑隔震控制研究

基于系统的振动微分方程，计算分析了底层框架砖砌体结构滑动隔震的有效性。结果表明，基底隔震控制使上部结构的最大振动响应尤其是底层框架的层间位移显著降低。     

中国地震台网、全球地震台网地震目录数据库和震相数据库

地震目录和震相数据在地震学研究中具有重要意义，本文介绍了中国地震台网、全球地震台网地震目录数据库和震相数据库的内容和查询使用方法。     

祁连党河南山北坡中-基性火山岩地质特征及时代

根据地质研究、区域对比，结合首次获得的Rb-Sr等时线年龄数据，从祁连党河南山(又称乌兰达坂山）北坡原中奥陶统地层中厘定出晚震旦纪中－基性火山岩系。根据这一新成果，认为该区中基性火山岩，斜长角闪岩基底以及侵入其中的扎子沟等花岗闪长岩岩基在大地构造分区上应划归中祁连地块；晚震旦纪该区无疑有过扩张、地壳减薄的地质事件，震旦纪晚期有过挤压闭合事件。     

方解石和白云石溶蚀实验热力学模型及地质意义

通过碳酸盐（方解石、白云石）溶蚀作用实验室模拟研究，建立了溶蚀作用的热力学模型方程，对埋藏成岩的3种不同温压条件下（348．15K，Mpa ,373．15K，25Mpa，403．15K，30MPa）碳酸盐溶蚀作用进行了定量研究。提出随着温度和压力的升高，碳酸盐溶解反应的吉布春播由能降低，因而溶解反应增强；在相同温度和压力的地质条件下，白云石较方解石更易溶蚀并形成次生孔隙，这为油气生成运移提供了有利的地下空间和通道。     

Dynamics of Global Climatic Changes and Possibility of Their Prediction Using Chemical Data from Greenland Ice

Records from the Greenland Ice Sheet Project Two ice core are considered in terms of dynamical systems theory and nonlinear prediction. Dynamical systems theory allows us to reconstruct some properties of a phenomenon based only on past behavior without any mechanistic assumptions or deterministic models. A near-term prediction of temperature, including a mean estimate and confidence interval, is made for 800 years into the future. The prediction suggests that the present short-time global warming trend will continue for at least 200 years and be followed by a reverse in the temperature trend.     

100kHz地波计算方法比较

对于无线电授时、导航来说,地球表面大地电特性非常重要,可以用地波衰减法测定大地等效电特性.目前有若干种方法可用于计算100kHz地波场强衰减和二次相位因子随传播路径的距离、大地电特性和大气折射指数的变化.对几种方法计算的结果和采用的参数作了比较和讨论.结果表明:对于1000km距离的均光滑的地球表面的地波传播而言,中国电波研究所的结果与国际电联有关建议书符合得最好.