L'Europe bleue: La politique communautaire des ressources marines: by Finn Laursen Institute for Global Policy Studies, Amsterdam, The Netherlands, 1986, 158 pp     

Michael A. Morris 《Marine Policy》1988,12(4)

  相似文献   

Habitat suitability modelling of economically important fish species with commercial fisheries data     

Morris  Liz; Ball  David 《ICES Journal of Marine Science》2006,63(9):1590-1603

  相似文献   

Radiogenic heating of comets by 26Al and implications for their time of formation     

Prialnik D  Bar-Nun A  Podolak M 《The Astrophysical journal》1987,319(2):993-1002

The effect of radiogenic heating on the thermal evolution of spherical icy bodies with radii 1 km < R < 100 km was investigated. The radioisotopes considered were 26Al, 40K, 232Th, 235U, and 238U. Except for the 26Al abundance, which was varied, the other initial abundances were kept fixed, at values derived from those of chondritic meteorites and corresponding to a gas-to-dust ratio of 1. The initial models were homogeneous and isothermal (To = 10 K) amorphous ice spheres, in a circular orbit at 10(4) AU from the Sun. The main object of this study was to examine the conditions under which the transition temperature from amorphous into cubic ice (Ta = 137 K) would be reached. It was shown that the influence of the short-lived radionuclide 26Al dominates the effect of other radioactive species for bodies of radii up to approximately 50 km. Consequently, if we require comets to retain their ice in amorphous form, as suggested by observations, an upper limit of approximately 4 x 10(-9) is obtained for the initial 26Al abundance in comets, a factor of 100 lower than that of the inclusions in the Allende meteorite. A lower limit for the formation time of comets may thus be derived. The possibility of a coexistence of molten cometary cores and extended amorphous ice mantles is ruled out. Larger icy spheres (R > 100 km) reached Ta even in the absence of 26Al, due to the decay of the other radionuclides. As a result, a crystalline core formed whose relative size depended on the composition assumed. Thus the outermost icy satellites in the solar system, which might have been formed of ice in the amorphous state, have probably undergone crystallization and may have exhibited eruptive activity when the gas trapped in the amorphous ice was released (e.g., Miranda).  相似文献   

All is not well at Hook Head     

John H. Morris  & Matthew Parkes 《Geology Today》2000,16(4):137-138

  相似文献   

AN ALTERNATIVE VIEWPOINT ON AREAL DATA AND CORRELATION ANALYSIS     

Arthur S. Morris 《The Professional geographer》1966,18(2):92-93

  相似文献   

High spatial resolution Galactic 3D extinction mapping with IPHAS     

Stuart E. Sale  J. E. Drew  Y. C. Unruh  M.J. Irwin  C. Knigge  S. Phillipps  A. A. Zijlstra  B. T. Gänsicke  R. Greimel  P. J. Groot  A. Mampaso  R. A. H. Morris  R. Napiwotzki  D. Steeghs  N. A. Walton 《Monthly notices of the Royal Astronomical Society》2009,392(2):497-513

We present an algorithm (MEAD, for 'Mapping Extinction Against Distance') which will determine intrinsic  ( r '− i ')  colour, extinction, and distance for early-A to K4 stars extracted from the IPHAS   r '/ i '/Hα  photometric data base. These data can be binned up to map extinction in three dimensions across the northern Galactic plane. The large size of the IPHAS data base (∼200 million unique objects), the accuracy of the digital photometry it contains and its faint limiting magnitude  ( r '∼ 20)  allow extinction to be mapped with fine angular (∼10 arcmin) and distance (∼ 0.1 kpc) resolution to distances of up to 10 kpc, outside the solar circle. High reddening within the solar circle on occasion brings this range down to ∼2 kpc. The resolution achieved, both in angle and depth, greatly exceeds that of previous empirical 3D extinction maps, enabling the structure of the Galactic Plane to be studied in increased detail. MEAD accounts for the effect of the survey magnitude limits, photometric errors, unresolved interstellar medium (ISM) substructure and binarity. The impact of metallicity variations, within the range typical of the Galactic disc is small. The accuracy and reliability of MEAD are tested through the use of simulated photometry created with Monte Carlo sampling techniques. The success of this algorithm is demonstrated on a selection of fields and the results are compared to the literature.  相似文献   

Methods and results of an automatic analysis of a complete sample of Swift-XRT observations of GRBs     

P. A. Evans  A. P. Beardmore  K. L. Page  J. P. Osborne  P. T. O'Brien  R. Willingale  R. L. C. Starling  D. N. Burrows  O. Godet  L. Vetere  J. Racusin  M. R. Goad  K. Wiersema  L. Angelini  M. Capalbi  G. Chincarini  N. Gehrels  J. A. Kennea  R. Margutti  D. C. Morris  C. J. Mountford  C. Pagani  M. Perri  P. Romano  N. Tanvir 《Monthly notices of the Royal Astronomical Society》2009,397(3):1177-1201

We present a homogeneous X-ray analysis of all 318 gamma-ray bursts detected by the X-ray telescope (XRT) on the Swift satellite up to 2008 July 23; this represents the largest sample of X-ray GRB data published to date. In Sections 2–3 , we detail the methods which the Swift -XRT team has developed to produce the enhanced positions, light curves, hardness ratios and spectra presented in this paper. Software using these methods continues to create such products for all new GRBs observed by the Swift -XRT. We also detail web-based tools allowing users to create these products for any object observed by the XRT, not just GRBs. In Sections 4–6 , we present the results of our analysis of GRBs, including probability distribution functions of the temporal and spectral properties of the sample. We demonstrate evidence for a consistent underlying behaviour which can produce a range of light-curve morphologies, and attempt to interpret this behaviour in the framework of external forward shock emission. We find several difficulties, in particular that reconciliation of our data with the forward shock model requires energy injection to continue for days to weeks.  相似文献   

Understanding salt mobilization from an irrigated catchment in south‐eastern Australia     

B. Selle  T. Thayalakumaran  M. Morris 《水文研究》2010,24(23):3307-3321

Groundwater discharge from the Riverine Plains of the southern Murray‐Darling Basin is a major process contributing salt to the Murray River in Australia. In this study, data from an irrigated 60 000 ha catchment in the Riverine Plains were analysed to understand groundwater discharge into deeply incised drains, the process dominating salt mobilization from the catchment. We applied three integrated methodologies: classification and regression trees (CART), conceptual modelling and artificial neural networks (ANNs) to a comprehensive, spatially lumped, monthly data set from July 1975 to December 2004. Using CART analysis, it was shown that rainfall was the most important variable consistently explaining the salt load patterns at the catchment outlet. Using the conceptual model representing spatially lumped groundwater discharge into deeply incised drains, we demonstrated that salt mobilization from the study catchment can be well represented by a rainfall contribution, influenced by the hydraulic head in the deep regional aquifer and potential evapotranspiration. Using ANNs, it was confirmed that rainfall had a much higher impact on salt loads at the catchment outlet than irrigation water use. All these results demonstrate that under conditions similar to those experienced from 1975 to 2004, it is rainfall rather than irrigation water use that governs salt mobilization from the study catchment. Management of salt mobilization from irrigated catchments has traditionally focussed on the improvement of irrigation practices but it could be equally important to further understand the scope for management to control groundwater discharge in these irrigation areas. Copyright © 2010 John Wiley & Sons, Ltd.  相似文献   

Brightness predictions for comets     

Daniel W E Green  Brian G Marsden  Charles S Morris 《Astronomy& Geophysics》2001,42(1):1.11-1.12

Daniel W E Green, Brian G Marsden and Charles S Morris write with the aim of illuminating the issue of cometary light curves and brightness predictions, following the publication in this journal last October of the letter by John McFarland (2000).  相似文献   

A field study of orographic precipitation anomalies during high velocity winds using an aerofoil rain gauge     

C. J. G. Morris  M. Nunez  S. Montes 《Theoretical and Applied Climatology》1995,51(3):139-151

Summary This study was prompted by a need to explain an anomaly in the apparent precipitation distribution over a prominent mountain subject to a high velocity westerly airstream. Historical data reveal that the lee receives 58% more precipitation than the summit. A novel rain gauge with a vertically orientated collecting orifice, 3 standard rain gauges and complementary wind data were procured from 3 sites on the mountain to assess the effect of the airstream on the precipitation distribution. The catch efficiency of standard rain gauges decrease after the wind velocity exceeds 2.5 ms^–1 Results indicate that the summit actually receives 59% more precipitation than the lee, where a vortex directly affects the precipitation distribution over, and east, of the mountain.With 11 Figures  相似文献