黄铁矿热电性研究在庞家河金矿评价中的应用   总被引：2，自引：0，他引：2  

权志高  李占游 《陕西地质》1995,(1)

庞家河金矿载金矿物黄铁矿的热电性测量结果为：热电系数（α）均为正值，平均223．075μv／℃，属空穴型（P型）导电。根据热电系数数值求得的热电性参数数位集中在（50～70）之间，反映庞家河金矿矿体剥蚀程度不大，属中上部出露；相对矿化总长度的剥蚀百分比为30％～35％，并根据热电性参数求得矿体的总延伸深度L＝1204m，矿体的尖灭深度L0＝805m。该计算结果与后来进行的矿床勘探结果基本吻合。  相似文献   

福建长乐-东山构造带的变形特征及动力学研究   总被引：6，自引：3，他引：6  

高俊  张建新  王荃 《地质论评》1993,39(1):57-63,T001

福建长乐—东山构造带是我国东南沿海中生代NE向线性构造带的一部分。从西向东分为三个亚带:福清—云霄钙碱性火山岩带(J_3);长乐—东山NE向韧性剪切带(K_1); 平潭—东山变质地体(P_z—J_3)。火山岩带以浅层构造、脆性挤压变形为特征。变质地体为一外来体,以深层构造、多期(即前J,J,K_1)叠加变形为特征,并于J_3末增生到欧亚大陆边缘。韧性剪切带是叠加在变质地体增生带上,为一左行平移简单剪切带。  相似文献   

硅基毫米波收发前端集成电路研究进展     

邱枫  宛操  罗雄耀  邓帅  徐涛涛  梅术聪  陈嘉文  吴亮  朱浩慎  车文荃  薛泉 《南京气象学院学报》2021,13(4):383-396

随着第五代移动通信技术（5G）逐步向毫米波频段（FR2）部署，以及目前无人驾驶技术对毫米波雷达技术的需求，高性能的毫米波收发前端集成电路成为了目前研究的热点.与此同时，硅基器件工艺的快速发展，极大地提高了晶体管的截止频率，为低成本、高性能的硅基毫米波集成电路设计提供了基础.本文对近年来的毫米波通信和雷达的硅基收发前端集成电路的研究现状和发展趋势进行了综述.  相似文献   

新疆卡瓦布拉克大型剪切带及成矿有利地段   总被引：1，自引：1，他引：0  

于海峰  修群业  李铨 《新疆地质》2002,20(4):364-366

在东天山“中天山结晶轴”南部的卡瓦布拉克－星星峡一带,存在一条长达500km以上的大型韧性剪切带。该带中发育有变形花岗闪长岩、蛇纹石化超基性岩、辉长岩侵入体、硅质岩和砾岩,说明在中天山前寒武纪地块与塔里木基底之间存在一条构造混杂岩带,韧性剪切带叠加在在构造混杂岩带上。该韧性剪切带宏观几何分布、次级构造组合、叠加变形特征均与康古尔塔格韧性剪切带极为相似。其中大洼地东部、沙垅铁矿南部和双峰山地区是金、铅、锌、铜成矿的有利区段。  相似文献   

三维GIS技术在露采矿山环境管理中的应用     

杭邦明  华建伟  徐雷  李泉  唐海燕 《江苏地质》2006,30(4):275-279

在简要介绍GIS技术的基础上,对传统平面图与三维模型进行了比较。结合实例介绍MAPGIS三维模型的建立及其在露采矿山环境管理信息系统中的应用,并对露采矿山生产、管理及决策上提供更加直观、有效的支持。  相似文献   

差分GPS水下立体定位系统   总被引：15，自引：3，他引：15  

王权  程鹏飞  章传银  王泽民  蔡艳辉  丁剑 《测绘科学》2006,31(5):18-19,21

差分GPS水下立体定位系统包括GPS差分基准站、GPS浮标、水下收发机、船基控制中心四部分。差分基准站提供GPS差分改正,实现浮标内置GPS高精度实时定位。GPS浮标完成水上和水下的集成,检测水下收发机发射的定位信号并测量信号到达的时间,同时将各种数据发送到船基控制中心。船基控制中心接收各个浮标的数据后实时解算水下收发机的位置,同时将结果发送给水下收发机。本文首先对系统的总体构成和各个部分的功能进行了介绍,然后详细推导了系统定位算法,最后结合系统试验情况给出了系统试验精度统计结果。  相似文献   

一次台风前部龙卷的多普勒天气雷达分析   总被引：12，自引：3，他引：12       下载免费PDF全文

何彩芬姚秀萍  胡春蕾全彩峰 《应用气象学报》2006,17(3):370-375

通过分析2004年8月25日发生在浙江省宁波市的一次台风前部龙卷发生发展的环境特征, 发现该龙卷发生在台风前部风切变区里, 尽管当时涡度、散度等物理量对于深对流发展不是非常有利, 但下湿中干、强的垂直风切变及地形条件等还是有利于局地弱龙卷的产生; 在宁波新一代天气雷达产品上表现为强的钩状回波, 速度场上有相邻的正负速度中心及强的组合切变值等。通过多个反射率产品、剖面产品等综合分析了该风暴的三维结构, 初步了解此类弱龙卷的发生机理, 为以后的预报提供一些经验。  相似文献   

Precise orbit determination for the GRACE mission using only GPS data   总被引：1，自引：1，他引：1  

Zhigui Kang  Byron Tapley  Srinivas Bettadpur  John Ries  Peter Nagel  Rick Pastor 《Journal of Geodesy》2006,80(6):322-331

The GRACE (gravity recovery and climate experiment) satellites, launched in March 2002, are each equipped with a BlackJack GPS onboard receiver for precise orbit determination and gravity field recovery. Since launch, there have been significant improvements in the background force models used for satellite orbit determination, most notably the model for the geopotential. This has resulted in significant improvements to orbit accuracy for very low altitude satellites. The purpose of this paper is to investigate how well the orbits of the GRACE satellites (about 470 km in altitude) can currently be determined using only GPS data and based on the current models and methods. The orbit accuracy is assessed using a number of tests, which include analysis of orbit fits, orbit overlaps, orbit connecting points, satellite Laser ranging residuals and K-band ranging (KBR) residuals. We show that 1-cm radial orbit accuracy for the GRACE satellites has probably been achieved. These precise GRACE orbits can be used for such purposes as improving gravity recovery from the GRACE KBR data and for atmospheric profiling, and they demonstrate the quality of the background force models being used.  相似文献   

Validation of a homogeneous 41-year (1961–2001) winter precipitation hindcasted dataset over the Iberian Peninsula: assessment of the regional improvement of global reanalysis     

M. G. Sotillo  M. L. Martín  F. Valero  M. Y. Luna 《Climate Dynamics》2006,27(6):627-645

A 44-year (1958–2001) homogeneous, Mediterranean, high-resolution atmospheric database was generated through dynamical downscaling within the HIPOCAS (Hindcast of Dynamic Processes of the Ocean and Coastal Areas of Europe) Project framework. This work attempts to provide a validation of the monthly winter HIPOCAS precipitation over the Iberian Peninsula and the Balearic Islands and to evaluate the potential improvement of these new hindcasted data versus global reanalysis datasets. The validation was performed through the comparative analysis with a precipitation database derived from 4,617 in situ stations located over Iberia and the Balearics. The statistical comparative analysis between the observed and the HIPOCAS fields highlights their very good agreement not only in terms of spatial and time distribution, but also in terms of total amount of precipitation. A principal component analysis is carried out, showing that the patterns derived from the HIPOCAS data largely capture the main characteristics of the observed field. Moreover, it is worth to note that the HIPOCAS patterns reproduce accurately the observed regional characteristics linked to the main orographic features of the study domain. The existence of high correlations between the hindcasted and observed principal component time series gives a measure of the model performance ability. An additional comparative study of the HIPOCAS winter precipitation with global reanalysis data (NCEP and ERA) is performed. This study reveals the important regional improvement in the characterization of the observed precipitation introduced by the HIPOCAS hindcast relative to the above global reanalyses. Such improvement is effective not only in terms of total amount values, but also in the spatial distribution, the observed field being much more realistically reproduced by HIPOCAS than by the global reanalysis data.  相似文献   

气象因子对金花梨生长发育的影响     

刘晓天  杨全勇 《河南气象》2006,(4):52-53

通过试验研究,探讨主要气象因子在唐河县的变化规律和对金花梨生长发育的影响,研究金花梨在遭受灾害性天气影响时,采取相应的技术措施,确保金花梨的高产、稳产。  相似文献