VLBI MK5B通道检测软件的设计与实现     

朱新颖  张洪波  李春来 《天文研究与技术》2011,(3)

针对国际上VLBI专用硬盘记录终端升级到MK5B后,数据记录格式发生了显著变化,设计了能够适应MK5B数据格式的通道检测软件。MK5B通道检测软件主要用于检查硬盘记录器记录数据的可读性以及确认接收机和VLBI终端等观测设备的参数设定。在软件设计过程中,考虑到软件的可维护性及可移植性,采用面向对象的设计方法。通过对两段观测数据的处理表明,MK5B通道检测软件工作稳定,处理结果正确,能够满足工作需要。  相似文献   

Seismic landslide simulations in discontinuous deformation analysis     

Jian-Hong Wu 《Computers and Geotechnics》2010

Discontinuous deformation analysis (DDA) is a numerical approach used to simulate the post-failure behavior of a blocky assembly. Three available algorithms incorporate seismic impacts into DDA simulations for earthquake-induced slope failure. The following methods are used: directly applying time-dependent accelerations to falling/sliding blocks (Method 1); adding time-dependent accelerations to base block (Method 2); and time-dependently constraining seismic displacements of the base block (Method 3). However, incorrect absolute movements of falling/sliding and base blocks were obtained using Method 1. Additionally, relative movements between falling/sliding blocks and the base block are opposite to those simulated by the other two algorithms—Methods 2 and 3. Since locating an earthquake-induced landslide before an earthquake is extremely difficult, the seismic movements of base rock are recorded. Method 1 applies recorded seismic data to sliding blocks in conflict with d’Alembert’s principle of mechanics. Additionally, in Method 2, when the computation time step must be longer than the time in seismic data, computational results reveal abnormal base block displacements due to the non-zero velocity recorded at the end time of seismic data in seismic DDA. In this study, a novel algorithm to diminish the velocity of the base rock in the seismic analysis is utilized to modify Method 2. Furthermore, this work confirms that DDA with the modified Methods 2 and 3 is a practical approach for earthquake-induced landslide simulations.  相似文献   

Comparison of Chemical Toxicity to Different Algal Species Based on Interspecies Correlation,Species Sensitivity,and Excess Toxicity          下载免费PDF全文

Xiao H. Wang  Yang Yu  Ling Fu  Hong W. Tai  Wei C. Qin  Li M. Su  Yuan H. Zhao 《洁净——土壤、空气、水》2016,44(7):803-808

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呼图壁地下储气库部分区域地表垂直形变机理研究   总被引：1，自引：0，他引：1  

李杰  李瑞  王晓强  石新朴  乔学军  郑黎明  阿卜杜塔伊尔.亚森  孙小旭  陈述江  方伟  程瑞忠 《中国地震研究》2016,30(3):451-463

利用在呼图壁地下储气库开展的2013~2015年7期二等水准测量获得的高差数据,对由于地表气井压力变化影响而发生的地下储气库地表垂直变形进行了分析。研究表明,呼图壁地下储气库区的地表变形除了构造成因引起的盆地下沉以外,其他主要形变成因来源有2个方面：一个是呼图壁地区的地下水超采影响着该地区的地表垂直变化;另一个是储气库集采气期间井口压力变化影响下的地表沉降,根据计算,储气库每MPa气井压力变化影响到的地表变化约为0.625~1.125mm。  相似文献   

PS-InSAR��SBAS-InSAR���ر�����ıȽ��о�   总被引：1，自引：0，他引：1  

侯安业  张景发  刘斌  罗毅  刘国林 《大地测量与地球动力学》2012,32(4):125-128

????PS-InSAR??SBAS-InSAR??????????????????????????????2004??2010???31??ENVISAT ASAR??????????????????????????????????????PS-InSAR??SBAS-InSAR?????????к?????????Щ??????????????SBAS-InSAR??PS???α??????????????????????????????????????????????е?????????????????????????????????????????????  相似文献   

TTC和COSAGPS软件在处理GPS数据中应用     

解博  高雅萍  李奕 《西部资源》2012,(3):65-66

本文探讨利用TTC和COSAGPS软件在处理GPS数据方面的应用,以甘洛县工业园区控制网为例,详细介绍TTC和COSAGPS软件处理GPS数据的过程。  相似文献   

Dominance of point source in heavy metal distributions in sediments of a major Sydney estuary (Australia)   总被引：1，自引：0，他引：1  

G. F. Birch  D. Evenden  M. E. Teutsch 《Environmental Geology》1996,28(4):169-174

 Size-normalized (<63 μm) distributions of Cu, Zn, and Pb in the surficial sediments of one of Sydneys' four major estuaries – the Georges River/Botany Bay estuary – are not facies or depositionally controlled, but rather their distribution is dominated by source. Point sources (waste dumps, sewage overflows, and discharge from a polluted river) are responsible for elevating sediment heavy-metal concentrations up to 50 times above background. Nonpoint sources contribute in raising baseline levels to four times background and comprise mainly stormwater and also marinas, moorings, and wharfs/jetties. Heavy metals disgorged from a point source (Cooks River) strongly impact the sediments in the lower estuary, which has implications for the construction of a new runway for Sydney airport. Received: 3 October 1994 · Accepted: 21 September 1995  相似文献   

The probability distribution of the ambiguity bootstrapped GNSS baseline   总被引：4，自引：0，他引：4  

P. J. G. Teunissen 《Journal of Geodesy》2001,75(5-6):267-275

 The purpose of carrier phase ambiguity resolution is to improve upon the quality of the estimated global navigation satellite system baseline by means of the integer ambiguity constraints. However, in order to evaluate the quality of the ambiguity resolved baseline rigorously, its probability distribution is required. This baseline distribution depends on the random characteristics of the estimated integer ambiguities, which in turn depend on the chosen integer estimator. In this contribution is presented an exact and closed-form expression for the baseline distribution in the case that use is made of integer bootstrapping. Also presented are the bootstrapped probability mass function and easy-to-compute measures for the bootstrapped baseline's probability of concentration. Received: 28 September 2000 / Accepted: 11 January 2001  相似文献   

青海省五道梁降水化学组成的初步分析   总被引：5，自引：0，他引：5  

杨龙元  任燕霞 《高原气象》1991,10(2):209-216

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SHORT COMMUNICATION THE RELATIONSHIP OF CLOSURE,MEAN CENTERING AND MATRIX RANK INTERPRETATION     

RANDYJ.PELL  MARYBETHSEASHOLTZ  BRUCER.KOWALSKI 《地理学报(英文版)》1992,(1)

This paper describes an investigation into the relationship of closure,a baseline offset and mean centeringto the interpretation of matrix rank.The equivalence of a certain type of closure to a constant baseline(i.e.a simple numerical offset which may vary between response channels but is constant over all samples)is demonstrated.A systematic approach to the interpretation of the rank of a matrix is given.  相似文献