六枝站旧址与新址观测资料对比分析     

于斌  丁江  张虎 《中低纬山地气象》2021,45(6):91-94

对六枝基本气象站新旧两址气象资料进行研究分析,通过统计原台站近30a年平均值及新站逐月平均值并计算各个相关要素与新旧地址的对比差值,从完整性、平均差值标准差比较及显著性检验方面分析新旧站点观测资料的差异与连续可用性。  相似文献   

多系统集成的全球地球观测系统与全球海洋观测系统   总被引：3，自引：0，他引：3  

麻常雷  高艳波 《海洋技术学报》2006,25(3):41-44,50

多系统集成的全球地球观测系统(GEOO S)是一个新概念,它从更高层次上规划全球的地球观测,国际社会十分重视这一系统的建设,其关键是综合、协调、持续的地球观测系统。全球海洋观测系统(GOO S)是GEO SS的重要组成部分,是它的一个子系统。文中阐述了GEO SS的基本概念及与GOO S的关系,综述了海洋环境基本要素观测技术特别是遥感观测技术的最新进展,它也是GEOO S的基本观测手段。  相似文献   

基于DSP和CPLD的数字ADCP信号处理系统   总被引：2，自引：0，他引：2  

朱昊  刘文耀  梁燕  梁捷  郭海涛  郝永杰 《海洋技术学报》2004,23(4):96-102

利用声学多普勒流速剖面仪(ADCP)测量流速是20世纪80年代初发展起来的一种流速流量测验新技术。文章介绍了一种以DSP和CPLD为核心的数字ADCP信号处理系统，阐述了系统工作原理、系统结构和软硬件设计。系统以TMS320C5410芯片作为系统控制和信号处理的核心，采用数字滤波和直接数字合成技术为接收和发射模块，提高系统的速度到10ns运算级，极大的降低了输入输出信号的漂移，水体空间分辨率达到1m。  相似文献   

自动海洋气象监测数据库及其WEB开发应用   总被引：1，自引：0，他引：1  

俞永庆 《海洋预报》2006,23(1):81-84

结合胜利油田近海自动海洋气象监测系统的建设,介绍了自动监测系统的构成与数据库设计及其WEB应用平台的功能和主要技术方法。  相似文献   

长江河口北槽抛泥作业状态下的悬沙浓度分布与扩散过程   总被引：7，自引：1，他引：7       下载免费PDF全文

吴加学  张叔英  任来法 《海洋与湖沼》2003,34(1):83-93

在长江河口北槽抛泥过程中，应用ASSM－Ⅰ型声学悬浮泥沙观测系统观测悬沙浓度的时空分布规律，结合多普勒流速剖面仪走航式断面流速测量。研究发现：（1）泥沙浓度垂向分布形成至少三种结构类型，即上小下大的“L”型和指数型，上大下小的“漂浮”型；（2）受抛泥泥沙输移的影响，断面流场形成低流速区，或分布在水体表、中层，或贯穿整个水体，形成流速切变锋，它们的强度随抛泥泥沙输移扩散逐渐减弱；（3）在落潮流和颗粒重力共同作用下，抛泥泥沙同时存在输移扩散和沉降过程。小潮型抛泥泥沙主要就近扩散和沉降，中潮和大潮型抛泥泥沙输移扩散范围较远。  相似文献   

天津地铁北站车站施工的工程测量探讨     

刘新立 《北京测绘》2008,(2):50-53

采用方向观测法和电子测距相结合的导线点观测方法代替传统的附（闭）合导线观测法进行地铁测量中的精密导线点观测;采用施工坐标系代替大地坐标系进行碎部施工放样工作。既保证了工程测量精度,也减少了数据的读取、录入和计算失误,从而提高了工程测量工作效率。  相似文献   

Aquifer hydraulic conductivity prediction via coupling model of MCMC-ANN          下载免费PDF全文

GUI Chun-lei  WANG Zhen-xing  MA Rong  ZUO Xue-feng 《地下水科学与工程》2021,9(1):1-11

Grain-size distribution data,as a substitute for measuring hydraulic conductivity(K),has often been used to get K value indirectly.With grain-size distribution data of 150 sets of samples being input data,this study combined the Artificial Neural Network technology(ANN)and Markov Chain Monte Carlo method(MCMC),which replaced the Monte Carlo method(MC)of Generalized Likelihood Uncertainty Estimation(GLUE),to establish the GLUE-ANN model for hydraulic conductivity prediction and uncertainty analysis.By means of applying the GLUE-ANN model to a typical piedmont region and central region of North China Plain,and being compared with actually measured values of hydraulic conductivity,the relative error ranges are between 1.55%and 23.53%and between 14.08%and 27.22%respectively,the accuracy of which can meet the requirements of groundwater resources assessment.The global best parameter gained through posterior distribution test indicates that the GLUEANN model,which has satisfying sampling efficiency and optimization capability,is able to reasonably reflect the uncertainty of hydrogeological parameters.Furthermore,the influence of stochastic observation error(SOE)in grain-size analysis upon prediction of hydraulic conductivity was discussed,and it is believed that the influence can not be neglected.  相似文献   

Silicon-on-Insulator-Based Single-Chip Image Sensors: Low-Voltage Scientific Imaging     

Vyshnavi Suntharalingam  Barry E. Burke  Michael J. Cooper 《Experimental Astronomy》2002,14(2):91-98

A low-voltage (≤3.3 V) imaging technology has been developed to enable scientific-grade imagers with low-power complex functions on chip. A 128 × 128 CCD imager with on-chip clocking and charge-domain analog-to-digital conversion, as well as an exploratory active pixel sensor have been demonstrated. A 640 × 960 CCD imager with optimized 12 bit charge-domain conversion and an improved active pixel sensor are presently in fabrication. This revised version was published online in July 2006 with corrections to the Cover Date.  相似文献   

Secrets of E2V Technologies CCDs (ex Marconi CCDs)     

Paul R. Jorden  Peter Pool  Simon M. Tulloch 《Experimental Astronomy》2002,14(2):69-75

To complement previously published information on E2V CCDs, we present here some less well-known information about Marconi CCDs. We show details of the performance of deep depletion silicon variants, and discuss other subtleties of performance. We also present an update on L3vision (sub-electron noise) devices, indicating current availability, options, and ongoing development work. Finally, we will give a flavour of the range of custom designs that have been made. Many of these are not commercially available, and may not be familiar to all astronomers or CCD technologists. This revised version was published online in July 2006 with corrections to the Cover Date.  相似文献   

Interferometric polarimetry of the cosmic microwave background: Methodology     

S.T. Myers  J.L. Sievers  J.R. Bond  C.R. Contaldi  B.S. Mason  T.J. Pearson  A.C.S. Readhead 《New Astronomy Reviews》2006,50(11-12):951

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