Showing 1 - 10 of 16
This paper presents both estimation and simulation as optimization problems that differ in the optimization criteria, minimization of a local expected loss for estimation and reproduction of global statistics (semivariogram, histogram) for simulation. An intermediate approach is proposed whereby...
Persistent link: https://www.econbiz.de/10009476997
The Gauss-Marquardt-Levenberg (GML) method of computer-based parameter estimation, in common with other gradient-based approaches, suffers from the drawback that it may become trapped in local objective function minima, and thus report optimized parameter values that are not, in fact, optimized...
Persistent link: https://www.econbiz.de/10009447949
Spatial characterization of non-Gaussian attributes in earth sciences and engineering commonly requires the estimation of their conditional distribution. The indicator and probability kriging approaches of current nonparametric geostatistics provide approximations for estimating conditional...
Persistent link: https://www.econbiz.de/10009447974
This report focuses on the nation's geoscience needs and recommends DOE activities to mitigate major problems that effect energy security. The report recommends new or redirected DOE geoscience research initiatives for oil and gas, coal, nuclear resources, structures and processes in the earth's...
Persistent link: https://www.econbiz.de/10009435426
The Model Parameter Estimation Experiment (MOPEX) is an international project aimed at developing enhanced techniques for the a priori estimation of parameters in hydrologic models and in land surface parameterization schemes connected to atmospheric models. The MOPEX science strategy involves:...
Persistent link: https://www.econbiz.de/10009435686
Hydraulic property measurements often rely on non-linear inversion models whose errors vary between samples. In non-linear physical measurement systems, bias can be directly quantified and removed using calibration standards. In hydrologic systems, field calibration is often infeasible and bias...
Persistent link: https://www.econbiz.de/10009435755
The properties of thermoluminescence glow curves, containing one or more glow peaks, have been determined for situations where the assumptions invoked to obtain the usual first and second order kinetics do not apply. First order kinetics occurs only when retrapping is negligible. If more than...
Persistent link: https://www.econbiz.de/10009436028
The objective of this project is to evaluate existing and emerging Open Geospatial Consortium (OGC) standards for use in LLNL programs that rely heavily on geographic data. OGC standards are intended to facilitate interoperability between geospatial processing systems to avoid duplication of...
Persistent link: https://www.econbiz.de/10009436198
CO{sub 2} capture and storage (CCS) presents a challenge to long-range planners, economic interests, regulators, law-makers, and other stakeholders and decision makers. To improve and optimize the use of limited resources and finances, it is important to define an end state for CCS. This ends...
Persistent link: https://www.econbiz.de/10009436471
This document is a preliminary effort to draw together some of the important simulation models that are available to Reclamation or that have been developed by Reclamation since 1987. This document has also attempted to lay out a framework by which these models might be used both for the...
Persistent link: https://www.econbiz.de/10009436725