吉林省一次强对流天气的中尺度分析

作者对１９９３年８月１２日发生在吉林省境内的一次龙卷风天气进行了分析。结果表明：在出现龙卷风之前和形成初期，地面风场，高空环流形势，Ｑ↑→矢量散度，对流稳定度和能量场诸方面都有表现，可提供预报信息。     

江西利山金矿床地质特征及控矿构造

本文较系统地阐述了利山金矿床的各项地质特征，并重点就控矿构造问题进行了总结讨论，认为ＮＷＷ向断裂带严格控制了所有金矿体的产出。ＮＮＥ、ＮＮＷ向断裂与ＮＷＷ向断裂带的交汇部位控制了富矿段的产出。在此基础上初步探讨了矿床成因及找矿方向，这对该地区的找矿评价和开发均具有实际意义     

Determining the location of buried plastic water pipes from measurements of ground surface vibration

‘Mapping the Underworld’ is a UK-based project, which aims to create a multi-sensor device that combines complementary technologies for remote buried utility service detection and location. One of the technologies to be incorporated in the device is low-frequency vibro-acoustics, and techniques for detecting buried infrastructure, in particular plastic water pipes, are being investigated. One of the proposed techniques involves excitation of the pipe at some known location with concurrent vibrational mapping of the ground surface in order to infer the location of the remainder of the pipe. In this paper, measurements made on a dedicated pipe rig are reported. Frequency response measurements relating vibrational velocity on the ground to the input excitation were acquired. Contour plots of the unwrapped phase revealed the location of the pipe to within 0.1-0.2 m. Magnitude contour plots revealed the excitation point and also the location of the pipe end. By examining the unwrapped phase gradients along a line above the pipe, it was possible to identify the wave-type within the pipe responsible for the ground surface vibration. Furthermore, changes in the ground surface phase speed computed using this method enabled the location of the end of the pipe to be confirmed.     

EXPERIMENTAL STUDY ON FALL VELOCITY OF NON-UNIFORM SEDIMENT IN FLOWING WATER

I INTRODUCTIONThe settlement of particles in fluid has been studied in many fields such as hydraulics, metallurgy andchemistry since the middle of 19 century because of its great importance. Although the settlement ofsingle particle and group settling velocity of uniform particles in still water are relatively well-studied, yetthe settlement of non-uniform particles in flowing water lacks understanding. For instance, Cunningham(1910), Richardson (1954) and Batchelor (1972), have obtained…     

江南南部—华南北部前汛期严重旱涝诊断分析

利用江南南部—华南北部区域18个站45年（1951～1995年）4～6月降水资料计算了Z指数,确定出该区域严重涝年（1954、1962、1968、1973、1975年）和严重旱年（1958、1963、1967、1985、1991年）。分析了严重旱涝的频数分布和空间分布的特征,以及印度洋和太平洋整个赤道地区的SSTA、OLR距平场的分布。结果表明旱涝年SSTA、OLR距平场均有明显的差异。     

Mineralogical study of spinel-lherzolite inclusions from basalts in southern and eastern China

Ten spinel-lherzolite inclusions and one olivine-websterite inclusion, which were collected from Fujian, Jiangsu, Hebei and Yunnan Provinces, consist of olivine (FΦ_87.7–91.2), enstatite (En_87.3–89.7), Cr-diopside and spinel. According to the Mg/(Mg+Fe²⁺) ratios in the rocks and their mineralogies, they are designated to the Cr-diopside type. The websterite is composed of bronzite (En_71.9) and augite, while the gabbro-norite consists of hypersthene (En_68.9) and augite, belonging to the Al-augite type. The geothermos of spinel-lherzolites were calculated with four geothermometric methods, giving a temperature range of 925°–1,072°C. However, according to P. R. A. Wells' method, temperatures range from 845δ to 1,014°C, and by D. H. Lindsly's approach, from 716°–974°C. Pressures range from 15.1 to 19.8 kb. Genetically, Spinel-lherzolites and olivine-websterite are thought to have been derived from residual mantle material by partial melting at approximately 1,000°C and at a depth of about 50–70 km. Websterite and gabbro-norite may be products of the crystallization-differentiation of alkali basaltic magma.     

柴达木盆地西部地区断裂类型及油气勘探意义

为研究柴西地区油气成藏及其与青藏高原隆升的关系,我们借助生长断层定性和定量分析,总结出该区断裂在演化上总体可归纳为两个主要形成时期和4种表现形式：早期形成时期(E1＋2?N),中生代以来开始活动,多数终止于下油砂山组末(约14.9 Ma); 晚期形成时期(N?Q),上油砂山组开始活动,狮子沟组(约8.2 Ma)以来活动尤为剧烈,持续至今。在形式上主要表现为限于下或上构造层的生长断层; 贯穿下、上构造层的生长断层和后期断层4类。柴西地区的这种断裂构造特征,与青藏高原的分阶段隆升相对应,控制着该区的油气运移、成藏、保存及改造,对我们在柴西地区的油气勘探工作具有重大意义。     

蔚县盆地中更新世哺乳动物化石新发现

1 研究目的(Objective) 蔚县盆地为典型的冀西北山间盆地,与阳原盆地仅一山之隔,二者共同组成了广义的"泥河湾盆地",盆地内广泛出露中更新统郝家台组(Qp2h)河-湖相沉积物.相比阳原盆地,蔚县盆地古生物化石研究程度较低.20世纪80年代,盆地北部(大南沟一带)出土具有上新世—早更新世面貌的小型哺乳动物化石,近...