The state of ⁷Be in the core of the Sun and the solar neutrino flux     

Nir J. Shaviv  Giora Shaviv 《Monthly notices of the Royal Astronomical Society》2003,341(1):119-128

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Quantification of model uncertainty in environmental modeling     

Ming Ye  Philip D. Meyer  Yu-Feng Lin  Shlomo P. Neuman 《Stochastic Environmental Research and Risk Assessment (SERRA)》2010,24(6):807-808

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Analysis of nonintrinsic spatial variability by residual kriging with application to regional groundwater levels   总被引：8，自引：0，他引：8  

Shlomo P. Neuman  Elizabeth A. Jacobson 《Mathematical Geology》1984,16(5):499-521

A method for obtaining pointwise or spatially averaged estimates of a nonintrinsic function is introduced based on residual kriging. The method relies on a stepwise iterative regression process for simultaneously estimating the global drift and residual semivariogram. Estimates of the function are then obtained by solving a modified set of simple kriging equations written for the residuals. The modification consists of replacing the true variogram in the kriging equations by the variogram of the residual estimates as obtained from the iterative regression process. The method is illustrated by considering groundwater levels in an Arizona aquifer. The results are compared with those obtained for the aquifer by the generalized covariance package BLUEPACK-3D.  相似文献   

Determination of Horizontal Aquifer Anisotropy with Three Wells   总被引：2，自引：0，他引：2  

Shlomo P. Neuman  Gary R. Walter  Harold W. Bentley  John J. Ward  Don Diego Gonzalez 《Ground water》1984,22(1):66-72

Existing methods for the determination of horizontal aquifer anisotropy by means of pumping tests require a minimum of four wells, one for water withdrawal and three for drawdown observations. This paper shows how the same methods can be used to determine anisotropy with as few as three wells, if at least two of them can be pumped in sequence. A field example is included. A method of analyzing data from more wells than the above minimum, by least squares, is also described.  相似文献   

Comment on the "Nothing older than three years"     

Neuman SP 《Ground water》2005,43(3):294

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Flow to a well in a five-layer system with application to the Oxnard Basin   总被引：3，自引：2，他引：1  

Li Y  Neuman SP 《Ground water》2007,45(6):672-682

Nearly 40 years ago, Neuman (1968) developed an analytical solution for drawdown in a system of three aquifers separated by two aquitards when one of the aquifers is pumped at a constant rate. Whereas the simpler case of two aquifers separated by one aquitard has been presented by Neuman and Witherspoon (1969a), the full five-layer solution has not been previously evaluated. We do so here using numerical inversion of its Laplace-transformed version and present selected results graphically in dimensionless form. The solution demonstrates that the effect of pumping propagates across all five layers, adding emphasis to a question previously raised by Neuman and Witherspoon about the validity of leaky aquifer theories that disregard drawdowns in unpumped aquifers. A large-scale, long-term pumping test spanning three aquifers separated by two aquitards near Oxnard, California, has been conducted and analyzed by Neuman and Witherspoon (1972). They evaluated the vertical hydraulic diffusivities of the aquitards using the Neuman-Witherspoon ratio method and their specific storage values on the basis of laboratory consolidation tests. We reinterpret the Oxnard pumping test by coupling the five-layer analytical solution of Neuman (1968) with the parameter estimation code PEST (Doherty 2002) and validate our results against drawdowns from a subsequent pumping test at the site. Our parameter estimates compare favorably with those of Neuman and Witherspoon (1972).  相似文献   

Dependence of Bayesian Model Selection Criteria and Fisher Information Matrix on Sample Size     

Dan Lu  Ming Ye  Shlomo P. Neuman 《Mathematical Geosciences》2011,43(8):971-993

Geostatistical analyses require an estimation of the covariance structure of a random field and its parameters jointly from noisy data. Whereas in some cases (as in that of a Matérn variogram) a range of structural models can be captured with one or a few parameters, in many other cases it is necessary to consider a discrete set of structural model alternatives, such as drifts and variograms. Ranking these alternatives and identifying the best among them has traditionally been done with the aid of information theoretic or Bayesian model selection criteria. There is an ongoing debate in the literature about the relative merits of these various criteria. We contribute to this discussion by using synthetic data to compare the abilities of two common Bayesian criteria, BIC and KIC, to discriminate between alternative models of drift as a function of sample size when drift and variogram parameters are unknown. Adopting the results of Markov Chain Monte Carlo simulations as reference we confirm that KIC reduces asymptotically to BIC and provides consistently more reliable indications of model quality than does BIC for samples of all sizes. Practical considerations often cause analysts to replace the observed Fisher information matrix entering into KIC with its expected value. Our results show that this causes the performance of KIC to deteriorate with diminishing sample size. These results are equally valid for one and multiple realizations of uncertain data entering into our analysis. Bayesian theory indicates that, in the case of statistically independent and identically distributed data, posterior model probabilities become asymptotically insensitive to prior probabilities as sample size increases. We do not find this to be the case when working with samples taken from an autocorrelated random field.  相似文献   

Type-Curve Interpretation of Multirate Single-Hole Pneumatic Injection Tests in Unsaturated Fractured Rock   总被引：1，自引：0，他引：1  

Walter A. Illman  Shlomo P. Neuman 《Ground water》2000,38(6):899-911

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Reply to comments by G. Gambolati and G. Galeati     

Shlomo P. Neuman  Javier Samper  Mariano Hernandez 《Mathematical Geology》1987,19(3):259-266

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An iterative algorithm for interactive multiobjective programming     

Shlomo P. Neuman  Roman Krzysztofowicz 《Advances in water resources》1977,1(1):1-14

A new iterative algorithm for interactive multiobjective programming is proposed. The algorithm is based on the Lagrange multiplier technique of generating noninferior solutions, and it is shown to converge under certain conditions. It reduces a complex multiobjective problem into a sequence of two-objective problems which the decision maker can handle more easily. The number of two-objective problems with which the decision maker is confronted, as well as the total number of noninferior solutions that must be generated, increase more or less linearly with the number of objectives. Computational efficiency is further enhanced by avoiding the need for regression. The decision maker interacts with the model directly in the functional space, and he is not required to translate his judgment of relative worth into numbers. Due to the iterative nature of the algorithm, the decision maker can articulate his preferences in a progressive manner. Furthermore, he may modify his attitude at any stage of the computation, based on partial results, without adversely affecting the quality of the solution. An example problem previously solved by other methods, including the surrogate worth trade-off approach, is used to illustrate the new algorithm.  相似文献