内蒙古北山地区阿民乌素公婆泉组变质火山岩年代学、地球化学特征及地质意义

内蒙古北山地区阿民乌素一带公婆泉组变质火山岩主要由钠长阳起岩、斜长阳起岩和斜长阳起片岩组成.三者主量元素显示相对高钠w(Na2O)=0.32％～2.46％,低钾w(K2O)=0.08％～0.38％、钛w(TiO2)=0.93％～1.03％,略富镁 w(MgO)=9.61％～12.04％、钙 w(CaO)=9.96％～1...     

Crustal structure of Dabieshan orogenic belt

The crustal structures ofP velocity and density on the deep seismic sounding profile across the Ilabieshan orogenic belt are presented. There is a 5-km-thick crustal “root” between the Yuexi and Xiaotian where the elevation is highest on the profile. An apparent Moho offset of 4. 5 km beneath the Xiaotian-Mozitan fault marks the paleo-suture of the Triassic collision. A high-velocity anomaly zone at the depth below 3 km beneath the ultra-high pressure (UHP) zone may be correlated to the higher content of UHP metamorphic rocks. Project supported by the National Natural Science Foundation of China and the Joint Earthquake Science Foundation.     

柴达木盆地东台吉乃尔盐湖盐类沉积特征及成盐年代的初步研究

东台吉乃尔盐湖经过长期的成盐演化和成矿过程 ,最终形成了以氯化钠化学沉积为主的蒸发盐 ,晶间卤水富含B、Li等多种元素卤水矿床 ,根据 1998年对该湖干盐滩中部所打的CK1孔钻孔剖面( 12m)及测试的几个14 C年龄 ,初步证实该盐湖上部盐层是在约 10 0 0 0aBP形成 ,未经碳酸盐和硫酸盐成盐阶段 ,盐湖形成初期即进入氯化物成盐阶段。     

Radiolarian biostratigraphy in the Southern Bering Sea since Pliocene

Detailed radiolarian biostratigraphy in the Plio-Pleistocene was analyzed by using samples from IODP Site U1340 that was drilled to a core depth of 604 m in the southern Bering Sea. A total of 227 species belonging to 102 genera were identified. Based on the distributions of the radiolarian index species at Site U1340, five radiolarian zones since the Pliocene were established in the southern Bering Sea for the first time, and 25 radiolarian bioevents were recognized. Their ages were estimated on the basis of the age-depth plot that was constructed by the synthetical datum of the effective biostratigraphic and magnetostratigraphic events. The radiolarian zones at Site U1340 were systematically compared with those in its adjacent regions since the late Early Pliocene, which further improved and interpreted the biostratigraphic datum as well as their correlations in the middle-high latitude of the North Pacific. In addition, the comparative results of radiolarian zones show that Botryostrobus aquilonaris Zone emended in this paper is equivalent to the upper part of the same zone defined by Hays, 1970, and Druppatractus irregularis-Dorydruppa bensoni Zone as well as Spongodiscus sp. Zone, newly proposed in this paper, are well correlated with Cycladophora sakaii Zone and Stylatractus universus Zone in the subarctic North Pacific, respectively.     

Magnetic field and flares of the large sunspot group of April–May 1978

From magnetograms of the active region 15266 obtained at Yunnan observatory we found that 1) an inverted field configuration and a twisted neutral line are both closely correlated with high-energy flare eruptions. After the flares, the field configuration and the neutral line revert to more stable states. 2) Most of the flares of the present region occurred away from the neutral line; those near the line occurred either in regions of high field gradient or in the vicinity of Severny's “neutral points”.     

虹吸式雨量计的调试与常见故障

1虹吸式雨量计的调试 使用前应对其零点和虹吸点进行检查。首先调整零点，虹吸管安装好后，往盛水器里倒水（注意缓慢均匀地将水倒入盛水器），检查虹吸终止后笔尖的位置是否恰在自记纸的零线上。如有误差，可微调笔根螺丝，使笔尖指在零线上，如无效，应松开浮子直杆上的螺丝米调整它。零点位置调整好即要凋整虹吸点的位置，方法是：用雨量杯量10mm干净的水，     

湖北省山区与平原雷电分布及其参数特征

为进一步了解山区与平原雷电参数分布特征及其差异,为山区和平原地区雷电防护工程设计和雷击风险评估提供参考,根据湖北省ADTD地闪定位系统2006年12月至2016年12月监测的资料,采用数理统计方法,对山区和平原地区的地闪频次、极性、雷电流幅值和波头陡度等参数分布特征进行了对比研究。结果表明:①山区地闪密度略高于平原地区,平原正地闪百分比稍高于山区,近10年的正地闪百分比呈上升趋势。②正地闪平均强度山区比平原大1.16kA,负地闪平均强度山区比平原小3.67kA,平原总地闪平均强度比山区大3.46kA。③总地闪小雷电流幅值(I≤30kA)概率山区比平原大8.9%,大雷电流幅值(I100kA)概率平原比山区大0.6%。④山区正地闪平均陡度分别比负、总地闪平均陡度大2.44kA/μs和2.31kA/μs,平原正、负、总地闪平均陡度分别比山区大3.41kA/μs、5.77kA/μs和5.64kA/μs。可以得出,山区小雷电流绕击率大于平原,正地闪雷电感应的危害大于负地闪和总地闪;平原地区大雷电流反击率比山区大,雷电感应的危害大于山区。     

利用形状匹配技术作数字图象对位

本文提出一种利用区域形状匹配技术来实现数字图象的自动对位的方法。利用对噪声和畸变相对稳定的弦分布形状匹配法,建立由待定位图象中分割出来的区域之间的相似关系。用概率松弛标签算法优化和确认匹配,进而得出对位所需的变换参数。分析和实验均表明:这种方法对有未知比例,位移和旋转变化的图象的对位效果良好。