Glacigenic Characteristics of the Luoquan Formation and Sediment Gravity Flow Reworking on It

The origin of the Luoquan Formation which occurs along the southern margin of the North China Blockhas long been argued. Based on recent work. the Formation is considered as a glacial sedimentary sequencepartially reworked by sediment gravity flow. The major evidence for the glacigene of Luoquan Formationdiamictites is as follows: 1, a striated and polished pavement with various features resulting from glacialabrasion and plucking, such as crescentic gouge, crescentic fracture, streamlined form and glaciated step; 2.unsorted diamictites with striated clast. faceted clast and iron-shaped stone formed by glaciation; 3. rhythmitewith dropstones; 4. a glacial sedimentary sequence bearing advance-retreat cycles; and 5. wide distribution ofthe diamictites. Glacial deposits can be distinguished from sediment gravity flow deposits by the features men-tioned above. Some characteristics of sediment gravity flow existing in the Luoquan Formation diamictites in-dicate that glacial deposits might have been partially reworked by sediment gravity flow. Therefore, this papersuggests that the Luoquan Formation diamictite is a result of a glacial event rather than a mud flow deposit.The primary tillites are the principal contribution of the Luoquan Formation, while sediment gravity flow de-posits are the redeposited diamictites and should be termed as glacigenic sediment gravity flow deposits.     

低频交流电法的试验和研究

本文介绍了关于低频交流电法的试验和研究结果: (1) 现场观测证实,低频交流电法与直流电法观测的电阻率数据(包括ρ,曲线变化)是同步的和相近的。(2) 交流电法的抗干扰(噪声)能力比直流电法有所增强。采用交流电法守将干扰(噪声)背景由通常的100μv压低到10μv,並可以完全消除风扰。(3) 采用交流电法可以提高观测精度,其观测精度为10~(-3)(直流电法精度为10~(-2),还可有效地分辨1—2%的地电前兆异常。(4) 探测同样深度,交流电法可比直流电法功耗减少一倍。     

On the Age of the Dongtang Formation in the Hengyang Basin of Hunan and the Cretaceous and Tertiary Boundary

Since the coexistence of the Cretaceous and Palaeocene was ascertained in the Hengyang Basin of Hunan in the middle of the 1960's, the Cretaceous and Tertiary boundary has been discussed in several papers, but it still remains controversal. The points at issue are the connotation, stratigraphical position and lateral correlation of the Dongtang (or Chejiang) Formation.     

利用粉晶衍射数据精测点阵参数计算程序

本文着重讨论了利用粉晶数据进行晶体点阵参数的计算问题(PDOLC)。计算程序采用外推最小二乘拟合技术,外推函数任选,作了详细的系统消光处理,分别估计了六个点阵参数的精度,适用于用各种粉晶方法获得的衍射数据处理。     

淮北平原中更新世以来古气候和沉积环境演变：来自涡河流域沉积物粒度和地球化学的证据

通过对毗邻中国南北地理分界线的第四系标准孔岩芯进行粒度和地球化学研究，探讨了淮北平原中更新世以来的古气候变化和沉积环境变迁。研究表明淮北平原中更新世气候在暖湿与干冷(温凉）频繁交替中总体经历了从暖湿趋于干冷，与中国东部季风区北部的温带季风气候变化趋势属同相位演变，而与受控于亚热带季风气候的长江中下游及淮河源区古气候演变模式总体呈反相位。晚更新世，气候总体经历了干冷(即温干—严寒—干冷）、温湿、转向干冷，却表现出与以长江中下游及淮河源区气候演化格局更相似，而与中国北方气候总体上由暖湿向干旱化转变步调不一致。进入全新世，淮北平原与中国南北方气候均回暖，降水相应增多。涡河流域GBK1标准孔区域沉积环境总体上经历了中更新世早中期从半深湖演化到浅湖、滨湖，到晚期湖泊快速收缩直至消失，演化为泛滥平原或河流；晚更新世以来主要为河流和泛滥平原。淮北平原区域气候变化总体上对全球变化有着积极的响应，或许因其地处中国南北地理分界线边缘，致使其气候又具区域独特性。     

遗传算法在磁异常反演中的应用

遗传算法是一种约束随机优化方法。它与传统的确定性优化方法相比较,具有全局收敛,不计算目标函数偏导数等优点；与传统的随机优化方法相比较,具有搜索效率高以及隐含并行计算等优点。本文首先讨论了遗传算法的基本原理和迭加机算步骤,其次讨论了该方法在磁化强度约束反演问题中的应用效果。     

DISTRIBUTION FEATURES OF GIANT SEA-SALT NUCLEI IN ATMOSPHERE OVER YONGXING ISLAND, XISHA ISLANDS,DURING NORTHEAST WINTER MONSOON

In this paper, the chlorine ions nuclei data, observed at Yongxing (Xisha Islands) during November 1987, are analyzed. The main results are:1) The average concentration of chiorine ions nuclei with dry diameters larger than 2 μm is 878 per litre and the average salt content is 105. 4μg/m³, in which special giant nuclei with dry diameters larger than 4 μm are 19O per litre. The largest dry diameter of chloride ions observed reaches 57 μm, which are larger than that observed there during the southwest summer monsoon. The spetrum type shows quasi-unimodal and exponential lapse. 2) The salt content decreases with the height over sea surface. 3) The concentrations of chlorine ions nuclei reach the maximum value at 0800 (Local time, same below). and minimum at 0200.     

地震与电磁辐射关系的定量分析

利用河北省地震电磁辐射台网连续１２ａ的观测资料，研究了地震强度与台站接收的电磁辐射的能量、周期、幅度的关系，并由此总结出５－６级中强地震和４．５－４．９级中等地震的短临预报指标。     

测高卫星径向摄动的时域表示

本文首先推导出了量级为ｅ＾｜ｑ｜的Ｇｌｐｑ（ｅ）的显式表达式，给出了Ｇｌｐｏｐ、Ｇｌｐ１和Ｇｌｐ－１和保留至ｅ＾｜ｑ｜＋２项的高阶公式，然后给出了与Ｋａｕｌａ线性解形式相类似的保留至ｅ＾２项的径向摄动公式，最后给出了径向摄动频率与轨道元素摄动频率之间的对应关系。     

模糊随机时变结构及其时变动力可靠度分析

研究了模糊随机时变结构在地震荷载作用下的动力响应，提出了Ｇａｕｓｓ模糊随机过程的模糊时变超越概率，以及模糊时变可靠度计算公式