从单台F差值分析看绝对观测中F人工观测的必要性

通过对同一台站人工观测的地磁场总强度F与连续记录F,及两套连续记录仪记录的地磁场总强度F夜均值的差值分析,发现同一台站两种差值均存在显著的年变化特征。对其他台站同样可以看到类似变化。而各时段的时均值差值也表现出相似的变化特征。由此说明,同一台站地磁观测区的不同点位,地磁场差异在长时间内不断发生变化,在进行绝对观测时,无法通过选择绝对观测时间消除该差值变化。     

Mugil curema as a PAH bioavailability monitor for Atlantic west sub-tropical estuaries

This work aimed to evaluate the use of Mugil curema as a biomonitor for polycyclic aromatic hydrocarbon (PAH) bioavailability. Fish biliary metabolites from low-contaminated (Cananéia) and contaminated (Santos) Brazilian estuaries were analysed using a high-performance liquid chromatography apparatus coupled to fluorescence detectors connected in a series. In the Cananéia and Santos estuaries, total metabolite levels ranged from 0.85 to 34.4 μg g^? 1 of bile and from 4.06 to 528 μg g^? 1 of bile, respectively. Metabolite levels were not influenced by feeding status or sexual hormones (p < 0.05), thus suggesting that M. curema is a good biomonitor for PAH bioavailability. In estuarine regions, it is possible to sample both the male and female genders of this species in any reproductive period.     

磁暴期内夜间h’F的突增现象

用3个经度链上电离层垂测站资料分析磁暴时夜间h＇F的同时突增现象提出了电动耦合在夜间出现东向电场从而使F层抬升的物理机制同时也解释了突增现象在午夜后更多,且增幅更强的事实．     

高氟水灌溉区水－土－植物系统氟迁移转化环境效应分析──以河北沧县为例

文章以河北沧县高氟水灌溉区土壤氟的积累与分布特征、氟等温吸附试验、吸附动力学试验、土柱模拟试验以及农作物含氟量为依据，对高氟水灌溉区水－土壤－植物系统氟迁移转化环境效应进行讨论分析，并提出了防止氟环境恶化的对策。     

珠江三角洲地区土壤F分布及其与地氟病关系初探

笔者结合珠江三角洲地区和中国土壤含F背景,研究了该区土壤F的含量特征、总体和典型区域的分布状况,对土壤类型、成土母质和土地利用类型等影响因素进行了分析,初步探讨了土壤F与地氟病的关系。结果表明,珠江三角洲地区浅层、深层土壤F平均含量分别为510mg/kg和529mg/kg,其中海(陆)相第四纪松散层区的三角洲沉积潜育性水稻土、三角洲盐渍水稻土、基水地的F含量最高。6760km2的浅层土壤F高背景区广泛分布于平原区,东莞、新会、珠海局部呈现污染区;深层土壤F高背景区5504km2,而污染区都集中在邻海的珠海市高栏、三灶两岛。土壤F的富集在沉积物区明显与第四纪海陆、陆海交互相沉积物有关,在基岩区明显和花岗岩类有关,人类影响较强的土壤和水稻土及其盐渍化有利于F富集。区内地氟病分布于从化、增城、东莞郊区、南海、新会和恩平,病区均位于高F的地层岩石区和土壤高F区。土壤F高背景区生长的农作物F含量存在超标,且病区农作物F超标率和超标倍数大于非病区,表明土壤中F的生物有效量比例较高,土壤F已向农产品中迁移和富集,危及到农产品质量。高F的地质环境是造成本区土壤及其农作物F含量高的主要原因,成为地氟病发生的致病因素。     

Necessary restructuring or globalization failure? Shifts in regional supplier relations after the merger of the former German Hoechst and French Rhône-Poulenc groups

A large part of the work in economic geography and other social sciences surrounding globalization processes has focused on the prospects of economic growth due to the establishment of global production chains and the rise of new clusters of industrial activity. In recent years, much less attention has been paid to former growth industries and regions that have suffered from the negative consequences of internationalization processes. This paper will explore the cases of two chemical regions, i.e. southern Hessen, Germany and Rhône-Alpes, France. Both regions were forced to undergo drastic restructuring since the mid 1990s due to the merger of the chemical groups Hoechst and Rhône-Poulenc into Aventis. The paper argues that it is beneficial to develop a relational perspective of economic action and interaction in order to better understand these regional transformations and restructuring processes and their consequences. Instead of investigating the development of activities, which became the core operations at Aventis, we will focus on other activities that were considered less important and, consequently, split off. In analyzing the logic of restructuring and the associated changes in regional supplier relations, this paper aims to contribute to a relational understanding of economic globalization and its associated threats to regional development by focusing on agents who are subject to negative restructuring consequences.     

水文变异的滑动F识别与检验方法

针对传统F检验法只能用于已知变异点的检验,而无法用于变异点的识别问题,本文提出了滑动F识别与检验法。该法首先利用传统F检验法对序列逐点进行检验,找出满足F计算值大于临界值的所有可能变异点,然后选择F计算值达到最大值的那一点作为最可能变异点。利用该法对潮白河水资源分区45年年径流量序列进行了分析,并从物理成因角度对该检验结果进行了确认。结果表明滑动F 识别与检验法具有较好的检验效果,检验结果可信度较高。     

Polychlorierte Dibenzo-p-dioxine, -furane (PCDD/F) und Analoga in Oberflächensedimenten und datierten aquatischen Sedimentkernen

Polychlorinated Dibenzo-p-dioxins, -furans (PCDD/F) and Analogues in Surface Sediments and Dated Aquatic Sediment Cores Aquatic sediments are the final sinks of unintentionally formed PCDD/Fs. Still not known are the conditions of formation of PCDD/Fs in the 8120 years old sediments in Japan and in 350 to 400 years old sediments in the Baltic. Sediments are means of source identification if transformation processes are taken into consideration in view of hydrological conditions. PCDD/Fs have been analysed 30 km from the source in sediments and over a distance of 50 km in benthos indicating a remarkable bioaccumulation potential. Elaborated data of the PCDD/F sediment contamination are missing as well as information on internal diagenetic processes, interactions at the sediment/water interface, and on the aerobic and anaerobic biodegradation and bioavailability of PCDD/Fs in sediments. Quality criteria for sediments and aquatic ecosystems remain to be elaborated.     

海口中层大气温度变化特性的Rayleigh激光雷达观测研究

中层大气温度变化的探测与研究是当前气候变化研究课题的一个组成部分, 本文基于海南激光雷达2010—2020年间的长期观测, 通过对中层大气Rayleigh散射信号的反演, 探讨了海口(19.9°N, 110.3°E)上空中层大气(32~64 km)温度变化特性.研究结果显示, 中层大气温度呈周期性变化趋势, 年、半年、季节变化幅度最大值分别为6.0、3.8、1.7 K, 平流层顶位于42~51 km高度, 日平均温度最高为~262 K.平流层温度主要表现为年变化趋势, 半年和季节变化不明显; 平流层顶和低中间层温度变化趋势具有年和半年变化特征, 季节变化不明显.在太阳活动性发生明显变化的周期里, 平流层顶温度的年际变化趋势对辐射通量F_10.7指数变化有较明显的响应; 而在太阳活动平静的年份里, 温度变化趋势与太阳辐射通量变化的相关性不明显.

     

吉林省白山市金英金矿床地质特征及成因探讨

金英金矿床产于叠加在先期存在的新元古界钓鱼台组石英砂岩与古元古界珍珠门组硅化白云质大理岩之间的不整合面附近的硅化构造角砾岩带中的F100断裂内,主要受区域性断裂F102及局部性断裂F100的联合控制.金英金矿形成的特殊环境和物化条件,使其具有独特的矿物组合和矿石结构构造,是我国目前发现的一种新类型金矿.金矿类型属于中生代造山带型金矿.