Intrinsic galaxy alignments from the 2SLAQ and SDSS surveys: luminosity and redshift scalings and implications for weak lensing surveys     

Christopher M. Hirata  Rachel Mandelbaum †  Mustapha Ishak  Uro&#; Seljak  Robert Nichol  Kevin A. Pimbblet  Nicholas P. Ross  David Wake 《Monthly notices of the Royal Astronomical Society》2007,381(3):1197-1218

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ON THE THEORY OF HITCH-HIKING AS A SPATIAL STOCHASTIC PROCESS     

Nicholas J. Cox 《The Professional geographer》1980,32(1):51-54

Hitch-hiking has been ignored by traditional geography. In this article it is shown that ideas and techniques from the new geography yield substantial insights into its character as a spatial process.  相似文献   

Numerical model of the shoreline change at Oarai beach     

Nicholas C. Kraus  Soichi Harikai 《Coastal Engineering》1983,7(1):1-28

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Marine habitats: loss and gain, mitigation and compensation     

Elliott M  Cutts ND 《Marine pollution bulletin》2004,49(9-10):671-674

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Rhinocerotid tooth enamel 18O/16O variability between 23 and 12 Ma in southwestern France     

Ilhem Bentaleb  Cyril Langlois  Céline Martin  Paula Iacumin  Matthieu Carré  Pierre-Olivier Antoine  Francis Duranthon  Issam Moussa  Jean-Jacques Jaeger  Nicholas Barrett  Ron Kandorp 《Comptes Rendus Geoscience》2006,338(3):172-179

The relationship between the oxygen isotope ratio of mammal tooth enamel and that of drinking water was used to reconstruct changes in the Miocene oxygen isotope ratio of rainfall (meteoric water ${\delta }^{18}$O_MW). These, in turn, are related to climatic parameters (temperature, precipitation and evaporation rate). ${\delta }^{18}$O values of rhinocerotid teeth from the Aquitaine Basin (southwestern France) suggest a significant climatic change between 17 and 12 Ma, characterized by cooling together with precipitation increase, in agreement with other terrestrial and oceanic records. To cite this article: I. Bentaleb et al., C. R. Geoscience 338 (2006).  相似文献   

The Rise of the GIS Volunteer     

Catherine E. Jones  Nicholas J. Mount  Patrick Weber 《Transactions in GIS》2012,16(4):431-434

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Internal variability in a regional climate model over West Africa     

Emilie Vanvyve  Nicholas Hall  Christophe Messager  Stéphanie Leroux  Jean-Pascal van Ypersele 《Climate Dynamics》2008,30(2-3):191-202

Sensitivity studies with regional climate models are often performed on the basis of a few simulations for which the difference is analysed and the statistical significance is often taken for granted. In this study we present some simple measures of the confidence limits for these types of experiments by analysing the internal variability of a regional climate model run over West Africa. Two 1-year long simulations, differing only in their initial conditions, are compared. The difference between the two runs gives a measure of the internal variability of the model and an indication of which timescales are reliable for analysis. The results are analysed for a range of timescales and spatial scales, and quantitative measures of the confidence limits for regional model simulations are diagnosed for a selection of study areas for rainfall, low level temperature and wind. As the averaging period or spatial scale is increased, the signal due to internal variability gets smaller and confidence in the simulations increases. This occurs more rapidly for variations in precipitation, which appear essentially random, than for dynamical variables, which show some organisation on larger scales.  相似文献   

Luminosity and surface brightness distribution of K-band galaxies from the UKIDSS Large Area Survey     

Anthony J. Smith  Jon Loveday  Nicholas J. G. Cross 《Monthly notices of the Royal Astronomical Society》2009,397(2):868-882

We present luminosity and surface-brightness distributions of 40 111 galaxies with K -band photometry from the United Kingdom Infrared Telescope (UKIRT) Infrared Deep Sky Survey (UKIDSS) Large Area Survey (LAS), Data Release 3 and optical photometry from Data Release 5 of the Sloan Digital Sky Survey (SDSS). Various features and limitations of the new UKIDSS data are examined, such as a problem affecting Petrosian magnitudes of extended sources. Selection limits in K - and r -band magnitude, K -band surface brightness and K -band radius are included explicitly in the  1/ V _max  estimate of the space density and luminosity function. The bivariate brightness distribution in K -band absolute magnitude and surface brightness is presented and found to display a clear luminosity–surface brightness correlation that flattens at high luminosity and broadens at low luminosity, consistent with similar analyses at optical wavelengths. Best-fitting Schechter function parameters for the K -band luminosity function are found to be   M *− 5 log  h =−23.19 ± 0.04, α=−0.81 ± 0.04  and  φ*= (0.0166 ± 0.0008)  h ³ Mpc⁻³  , although the Schechter function provides a poor fit to the data at high and low luminosity, while the luminosity density in the K band is found to be   j = (6.305 ± 0.067) × 10⁸ L_⊙  h  Mpc⁻³  . However, we caution that there are various known sources of incompleteness and uncertainty in our results. Using mass-to-light ratios determined from the optical colours, we estimate the stellar mass function, finding good agreement with previous results. Possible improvements are discussed that could be implemented when extending this analysis to the full LAS.  相似文献   

The 2dF–SDSS LRG and QSO survey: the QSO luminosity function at 0.4 < z < 2.6     

Scott M. Croom  Gordon T. Richards  Tom Shanks  Brian J. Boyle  Michael A. Strauss  Adam D. Myers  Robert C. Nichol  Kevin A. Pimbblet  Nicholas P. Ross  Donald P. Schneider  Robert G. Sharp  David A. Wake 《Monthly notices of the Royal Astronomical Society》2009,399(4):1755-1772

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Very rapid subsurface hydrothermal ore deposition mechanisms and the origin of breccia-hosted iron-oxide copper–gold deposits     

Nicholas H.S. Oliver  Michael J. Rubenach  Jaiby-Ann Jacob  Brian G. Rusk  Martina Bertelli  James S. Cleverley  Thomas G. Blenkinsop  David R. Cooke  Timothy Baker  Damien Jungman  Bruce W.D. Yardley  Timothy Laneyrie 《Journal of Geochemical Exploration》2009

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