A derivation of the luminosity function of the Kuiper belt from a broken power-law size distribution     

Wesley C. Fraser  J.J. Kavelaars 《Icarus》2008,198(2):452-458

We have derived a model of the Kuiper belt luminosity function exhibited by a broken power-law size distribution. This model allows direct comparison of the observed luminosity function to the underlying size distribution. We discuss the importance of the radial distribution model in determining the break diameter. We determine a best-fit break-diameter of the Kuiper belt size-distribution of 30<Db<90 km via a maximum-likelihood fit of our model to the observed luminosity function. We also confirm that the observed luminosity function for m(R)∼21-28 is consistent with a broken power-law size distribution, and exhibits a break at .  相似文献   

Covariance function diagnostics for spatial linear models     

Ronald Christensen  Wesley Johnson  Larry M. Pearson 《Mathematical Geology》1993,25(2):145-160

Case deletion diagnostics are developed for detecting observations that are influential in estimating the covariance function of a spatial random field. Diagnostics are developed within the context of universal kriging. Computational formulae are given that make the procedures feasible and the diagnostics are illustrated in an example.  相似文献   

Potential competition between hybrid striped bass (Morone saxatilis × M. americana) and striped bass (M. saxatilis) in the Cape Fear River estuary, North Carolina     

Wesley S. Patrick  Mary L. Moser 《Estuaries and Coasts》2001,24(3):425-429

Gillnet surveys from 1990 to 1992 and from 1996 to 1999 indicated a two-fold decrease in native striped bass (Morone saxatilis) populations and a concomitant two-fold increase in hybrid striped bass (Morone saxatilis × M. americana) in the Cape Fear River estuary, North Carolina. Gut content analysis indicated high diet overlap, and tagrecapture data suggested that hybrid striped bass participate in spawning migrations. These data provide circumstantial evidence that hybrid striped bass compete with striped bass for food and that they may compete for mates or habitat on the spawning grounds. Increasing abundance of adult hybrid striped bass in this system elevates the likelihood of hybrid introgression. We recommend that stocking of hybrid striped bass be terminated to preserve native striped bass populations.  相似文献   

Reply to discussion By T. H. Lee and D. A. Wesley     

T. H. Lee  D. A. Wesley  Anil K. Chopra  Jorge A. Gutierrez 《地震工程与结构动力学》1974,3(4):402-402

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Erosion‐initiated stromatolite and thrombolite formation in a present‐day coastal sabkha setting     

Andreas Paul  Stephen W. Lokier  Angela Sherry  Luiza Lessa Andrade  Wesley M. Court  Cees van der Land  Kirsten E. Dutton  Ian M. Head 《Sedimentology》2021,68(1):382-401

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Modeling Geospatial Uncertainty of Geometallurgical Variables with Bayesian Models and Hilbert–Kriging     

Hoffimann  J&#;lio  Augusto  Jos&#;  Resende  Lucas  Mathias  Marlon  Mazzinghy  Douglas  Bianchetti  Matheus  Mendes  M&#;nica  Souza  Thiago  Andrade  Vitor  Domingues  Tarc&#;sio  Silva  Wesley  Silva  Ruberlan  Couto  Danielly  Fonseca  Elisabeth  Gon&#;alves  Keila 《Mathematical Geosciences》2022,54(7):1227-1253

Mathematical Geosciences - In mine planning, geospatial estimates of variables such as comminution indexes and metallurgical recovery are extremely important to locate blocks for which the energy...  相似文献   

Bayesian spatial modeling of Lavaca Bay pollutants     

Bissett W  Garry Adams L  Field R  Moyer W  Phillips T  Morgan Scott H  Wade T  Sweet S  Thompson JA 《Marine pollution bulletin》2008,56(10):1781-1787

Locational risk of increased mercury and PAH concentrations in Lavaca Bay, Texas sediments and eastern oysters (Crassostrea virginica) harvested from Lavaca Bay, Texas were analysed. Chemical analysis results were evaluated utilizing Bayesian geo-statistical methods for comparison of the model fit of a random effects model versus a convoluted model which included both random and spatial effects. For those results fit best with the convoluted model, continuous surface maps of predicted parameter values were created. Sediment and oyster concentrations of mercury and the majority of measured PAHs were fit best with the convoluted model. The locational risks of encountering elevated concentrations of these pollutants in Lavaca Bay sediments and oysters were highest in close proximity to industrial facilities.  相似文献   

Evolution of pantellerite-trachyte-phonolite volcanoes by fractional crystallization of basanite magma in a continental rift setting,Marie Byrd Land,Antarctica     

Wesley E. LeMasurier  Sung Hi Choi  Y. Kawachi  Samuel B. Mukasa  N. W. Rogers 《Contributions to Mineralogy and Petrology》2011,162(6):1175-1199

The Marie Byrd Land province includes 18 large (up to 1,800 km³) central volcanoes distributed across an active volcano-tectonic dome. The typical volcano structure consists of a basal 1,000–5,000 m of basanite surmounted by trachyte and subordinate intermediate rocks, plus phonolite, or pantellerite, or comendite. The volumes of felsic sections are large (~30–700 km³), but these rocks probably make up <10% of volcanic rock in the province. This paper describes pantellerite volcanoes in the Ames and Flood Ranges, which include a large and varied suite of these iron-rich, silica-poor rhyolites. Isotopic and trace element data, maintenance of isotopic equilibrium throughout the basalt-felsic range, and the results of modeling, all exclude significant crustal contamination and point to fractional crystallization as the process that controls magmatic evolution. The most unusual feature of these volcanoes is the apparent need to derive pantellerites from basanite, the long interval of fractionation at the base of the lithosphere and crust, involving kaersutite as the key phase in developing pantellerite, and a plumbing system that permitted coeval eruption of pantellerite and phonolite from the same edifice. Peralkalinity most likely developed in upper crustal reservoirs during the final 4–5% of magmatic history, by fractionating a high proportion of plagioclase under low pH₂O. Mantle plume activity appears to drive doming and volcanism. This, a stationary plate, and continental lithospheric structure seem to provide an optimal environment for the evolution of a diverse, large volume suite of felsic rocks by fractional crystallization.  相似文献   

Preface     

Wesley T. Huntress  Jr.   《Planetary and Space Science》2006,54(15):1565-1566

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Nonlinear analysis of rainfall dynamics in California's Sacramento Valley   总被引：1，自引：0，他引：1  

Bellie Sivakumar  Wesley W. Wallender  William R. Horwath  Jeffrey P. Mitchell  Samuel E. Prentice  Brian A. Joyce 《水文研究》2006,20(8):1723-1736

This study investigates the dynamic nature of rainfall observed at the Sustainable Agriculture Farming Systems (SAFS) site in California's Sacramento Valley, which was established to study the benefits of winter cover cropping in Mediterranean irrigated‐arid systems. Rainfall data of four different temporal scales (i.e. daily, weekly, biweekly, and monthly) are analysed to determine the dynamic nature of precipitation in time. In an arid climate with seasonal precipitation this has large implications for land and water management, both in the short term and in the long term. A nonlinear dynamic technique (correlation dimension method) that uses the phase‐space reconstruction and dimension concepts is employed. Bearing in mind the possible effects of the presence of zeros (i.e. no rain) on the outcomes of this analysis, an attempt is also made to compare the dynamic nature of all‐year rainfall and winter rainfall. Analysis of 15 years of data suggests that rainfall dynamics at this site are dominated by a large number of variables, regardless of the scales and seasons studied. The dimension results also suggest that: (1) rainfall dynamics at coarser resolutions are more irregular than that at finer resolutions; (2) winter rainfall has a higher variability than all‐year rainfall. These results are indeed useful to gain information about the complexity of the rainfall process at this site with respect to (temporal) scales and seasons and, hence, the appropriate model (high‐dimensional) type. However, in view of the potential effects of certain rainfall data characteristics (e.g. zeros, measurement errors, scale effects) on the correlation dimension analysis, the discussion also emphasizes the need for further verification, and possibly confirmation, of these results. Copyright © 2005 John Wiley & Sons, Ltd.  相似文献