微震仪标定精度的分析与改进     

黄华明  尹翠莲 《华南地震》1994,14(3):70-76

从微震仪标定的基本公式出发，以误差理论为基础，以ＤＤ—１型地震仪为例，导出标定中各因素对标定精度的影响；并用概率统计方法，对标定精度做了比较符合实际的计算，进而提出了提高标定精度的改进措施。  相似文献   

利用近场地震加速度记录测定近震震级ML的研究     

章文波  彭克中 《地震工程与工程振动》1995,15(3):4-11

本文对如何利用强震加速度记录测定近震震级ＭＬ的问题进行了研究，指出了在我国所使用的原始量规函数存在着系统偏差，并用回归现有观测资料的方法修正了这种系统偏差。用修正后的量规函数，利用近场加速度记录计算的ＭＬ值同微震台网所测定的值符合得较好，说明本文所提出的方法是可行的。  相似文献   

SHORT COMMUNICATION COMMENTS ON THE RESIDUAL BILINEARIZATION METHOD     

YONGDONG WANG  ODD S.BORGEN  BRUCE R.KOWALSKI Laboratory for Chemometrics  Center for Process Analytical Chemistry  Department of Chemistry  BG-  University of Washington  Seattle  WA  U.S.A. Present address:Perkin-Elmer Corporation  Main Avenue  Norwalk  CT -  U.S.A. 《地理学报(英文版)》1993,(5)

Through theoretical analysis and computer simulation,this short communication comments on theresidual bilinearization(RBL)method and compares it with non-bilinear rank annihilation(NBRA)forthe treatment of second-order calibration with non-bilinear data.It is found that these two methods aremathematically equivalent but have different noise propagation properties.The second-order advantage,namely quantitation in the presence of unknown interferences,can be carried over to non-bilinear dataonly if there exists a net analyte rank(NAR)for the analyte of interest.  相似文献   

规整化标定在地震遥测系统中的应用     

杨青春  郑新  崔小春  刘海祥 《高原地震》1997,(4)

规整化标定是模拟观测地震仪器标定的一种方法。系统介绍了规整化标定仪器的方法、参数，发现它有许多优点，是标定遥测地震仪器的一种较理想的方法。  相似文献   

台网遥测设备管理软件CALI编制与应用     

郭育  杨锡杰 《东北地震研究》1997,13(1):64-68

本软件采用Ｆｏｘｐｒｏ２．５新一代数据库管理系统编写，主要用于遥测地震台网的设备管理及常规系统标定参数的计算，并已在１９９５年系统标定中得到了实践检验。  相似文献   

The identifiability of parameters in a water quality model of the Biebrza River, Poland   总被引：1，自引：0，他引：1  

Marcel van der Perk  Marc F. P. Bierkens 《Journal of Hydrology》1997,200(1-4):307-322

The identifiability of model parameters of a steady state water quality model of the Biebrza River and the resulting variation in model results was examined by applying the Monte Carlo method which combines calibration, identifiability analysis, uncertainty analysis, and sensitivity analysis. The water quality model simulates the steady state concentration profiles of chloride, phosphate, ammonium, and nitrate as a function of distance along a river. The water quality model with the best combination of parameter values simulates the observed concentrations very well. However, the range of possible modelled concentrations obtained for other more or less equally eligible combinations of parameter values is rather wide. This range in model outcomes reflects possible errors in the model parameters. Discrepancies between the range in model outcomes and the validation data set are only caused by errors in model structure, or (measurement) errors in boundary conditions or input variables. In this sense the validation procedure is a test of model capability, where the effects of calibration errors are filtered out. It is concluded that, despite some slight deviations between model outcome and observations, the model is successful in simulating the spatial pattern of nutrient concentrations in the Biebrza River.  相似文献   

Methodology for construction, calibration and validation of a national hydrological model for Denmark   总被引：13，自引：0，他引：13  

Hans Jrgen Henriksen  Lars Troldborg  Per Nyegaard  Torben Obel Sonnenborg  Jens Christian Refsgaard  Bjarne Madsen 《Journal of Hydrology》2003,280(1-4):52-71

An integrated groundwater/surface water hydrological model with a 1 km² grid has been constructed for Denmark covering 43,000 km². The model is composed of a relatively simple root zone component for estimating the net precipitation, a comprehensive three-dimensional groundwater component for estimating recharge to and hydraulic heads in different geological layers, and a river component for streamflow routing and calculating stream–aquifer interaction. The model was constructed on the basis of the MIKE SHE code and by utilising comprehensive national databases on geology, soil, topography, river systems, climate and hydrology. The present paper describes the modelling process for the 7330 km² island of Sjælland with emphasis on the problems experienced in combining the classical paradigms of groundwater modelling, such as inverse modelling of steady-state conditions, and catchment modelling, focussing on dynamic conditions and discharge simulation. Three model versions with different assumptions on input data and parameter values were required until the performance of the final, according to pre-defined accuracy criteria, model was evaluated as being satisfactory. The paper highlights the methodological issues related to establishment of performance criteria, parameterisation and assessment of parameter values from field data, calibration and validation test schemes. Most of the parameter values were assessed directly from field data, while about 10 ‘free’ parameters were subject to calibration using a combination of inverse steady-state groundwater modelling and manual trial-and-error dynamic groundwater/surface water modelling. Emphasising the importance of tests against independent data, the validation schemes included combinations of split-sample tests (another period) and proxy-basin tests (another area).  相似文献   

A model for adjustment of differential gravity measurements with simultaneous gravimeter calibration     

F. J. S. S. Dias  Í. P. Escobar 《Journal of Geodesy》2001,75(2-3):151-156

 A mathematical model is proposed for adjustment of differential or relative gravity measurements, involving simultaneously instrumental readings, coefficients of the calibration function, and gravity values of selected base stations. Tests were performed with LaCoste and Romberg model G gravimeter measurements for a set of base stations located along a north–south line with 1750 mGal gravity range. This line was linked to nine control stations, where absolute gravity values had been determined by the free-fall method, with an accuracy better than 10 μGal. The model shows good consistence and stability. Results show the possibility of improving the calibration functions of gravimeters, as well as a better estimation of the gravity values, due to the flexibility admitted to the values of the calibration coefficients. Received: 15 November 1999 / Accepted: 31 October 2000  相似文献   

关于氡测量标定装置(氡室)和测量单位的统一     

吴慧山  李国栋  林玉飞  常桂兰 《铀矿地质》1988,(6)

本文介绍了作者研制的8505—I型氡室,该氡室可用于准确和快速标定多种测氡装置。作者提出了相应的标定方法,并测定了野外常用的10种氡探测器的标定系数。根据法定计量单位选用了贝克(Bq)和贝克/升(Bq/L)。相应作为各种氡测量的[放射性]活度单位和氡浓度单位。  相似文献   

On the evaluation of sediment transport models in tidal environments     

Christian Winter 《Sedimentary Geology》2007,202(3):562-571

The application of numerical models for the simulation of coastal hydro-and sediment dynamics requires model verification, calibration and validation with field data. Yet, no commonly accepted rules for the evaluation of sediment transport models exist. This paper discusses the significance of statistical parameters and their limitations considering common time lags in tidal environments. It is shown that the occasionally used discrepancy ratio lacks quantitative and qualitative information on model performance, as the time context information on time series characteristics is lost. As an initial measure of association, the simple linear correlation coefficient r² is proposed. To account for time lag errors in suspended transport models, a separate cross-correlation analysis for the flood and ebb tidal phase is proposed. For a comparison with other model applications, a concluding rating of model performance can be expressed by a dimensionless error definition which takes into account the quality of field data.  相似文献