INFORMATION THEORY AND SEQUENCES OF LAND USE: AN APPLICATION     

Vincent B. Robinson 《The Professional geographer》1978,30(2):174-179

This paper addresses the question of how far into the past previous land-use patterns provide significant information concerning present or future patterns. The provision of information is viewed as a reduction in uncertainty. An information-theoretic approach that permits both statistical and graphical analysis is suggested. Application of this method to the analysis of land-use change in three townships on the fringe of Akron, Ohio suggests that, to a varying degree, the processes of change are first-order Markov processes.  相似文献   

Velocity variations of an equatorial plume throughout a Jovian year     

Elmer Reese  Reta Beebe 《Icarus》1976,29(2):225-229

Analysis of features in the Equatorial Zone of Jupiter has shown that the equatorial plume reported by Pioneer 10 has existed for an 11-yr interval. During this interval the plume has shown an acceleration which can be interpreted as a constant component of 3 × 10^?8 m/sec² and a sinusoidal component which anticorrelates with the planetocentric declination of the Sun, D_S, and has an amplitude of ?0.96 m/sec per degree change of D_S. The sinusoidal component has been interpreted in terms of solar heating. Throughout this interval of time the Equatorial Zone has appeared abnormally dark and has contained many dark projections along the northern edge. When the plume approaches to within 25 to 30° of these features they are deflected in the direction of motion of the plume and then dissipate or become obscured as the plume passes. After passage of the plume normal features are again observed.  相似文献   

Aspects of the geomorphology of the sandstone cliffs of the central Weald: Report of an excursion to West Hoathly and Groombridge Saturday, 5 October 1974     

D.A. Robinson  R.B.G. Williams 《Proceedings of the Geologists' Association. Geologists' Association》1976,87(1):93-99

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Comment on “late Pleistocene glacial chronology of the Taylor Valley, Antarctica, and the global climate,” by Hendy, Healy, Rayner, Shaw, and Wilson (1979)     

P. H. Robinson  J. R. Keys 《Quaternary Research》1982,17(3)

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THE VIRTUAL MICROSCOPE     

Doug Robinson 《地学学报》1994,6(6):638-641

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Testing the photoionization models of powerful radio galaxies: mixed line-emitting media in 3C 321     

T. G. Robinson  C. N. Tadhunter  D. J. Axon  A. Robinson 《Monthly notices of the Royal Astronomical Society》2000,317(4):922-936

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Stochastic-growth theory of Langmuir growth-rate fluctuations in type III solar radio sources     

P. A. Robinson 《Solar physics》1993,146(2):357-363

Fluctuations in type III beams are produced by quasilinear interactions with clumpy Langmuir waves in type III radio sources. The properties of these fluctuations are estimated and shown to yield Langmuir growth rates and growth-rate fluctuations consistent with those required by the recent stochastic-growth theory of type III radio bursts, with observations, and with existing theoretical constraints. This strengthens the basis of stochastic-growth theory and provides an essential consistency test for this model.  相似文献   

Sulphur isotope studies of the Mt Molloy,Dianne and O.K. stratiform sulphide deposits,Hodgkinson Province,North Queensland,Australia     

Peter W. Gregory  Brian W. Robinson 《Mineralium Deposita》1984,19(1):36-43

Stratiform sulphide deposits which have been metamorphosed to lower greenschist facies occur within the Paleozoic strata of the Hodgkinson Province, northeast Queensland. Massive cupreous pyrite is ubiquitous and Mt Molloy and Dianne also have layered chalcopyrite-rich and sphalerite-rich lenses. Sulphide ³⁴S values for the mineralisation show a narrow spread, around 02030; at the Dianne and O.K. deposits, but a wider spread and an average several per mil higher at the Mt Molloy area. The minerals can not be used for geothermometry due to isotopic disequilibrium. However, metamorphic effects on the isotopic compositions appear not to have been significant. A decrease in temperature and contact of the ore fluid with sea water probably caused the precipitation of the ore minerals. A magmatic ore fluid with ³⁴S_S around 02030; predominated at the Dianne and OK deposits whereas the fluid at Mt Molloy mixed with sea water to acquire a higher ³⁴S_S value.  相似文献   

Lipid composition of a Recent Polynesian microbial mat sequence     

J.P. Boudou  J. Trichet  N. Robinson  S.C. Brassell 《Organic Geochemistry》1986,10(4-6)

The extractable lipid composition of four layers of a microbial mat from Hao, French Polynesia, shows differences that reflect both the imprint of their microbial populations and the selective diagenetic transformations of specific microbial compounds.The uppermost layers, principally composed of cyanobacteria and other bacteria, contain lipids typical of such microbes, namely n-heptadecane, heptadecene, hexadecanoic acid, and various sterols. With increasing depth the selective degradation of lower n-alkane homologues occurs; n-alkenes also show enhanced degradation.The predominant sterols in the bottom horizon of the mat are C₂, and C₃₀ components, including dinosterol and other 4-methylsterols presumably derived from dinofiagellates. In addition, there is an increase in the proportion of stanols with depth, perhaps arising from preferential degradation of δ⁵-stenols.  相似文献   

Automatic recognition of geologic prospects     

J. E. Robinson  Vijay Singh 《Mathematical Geosciences》1983,15(1):183-195

Computer recognition of prospective areas through the processing of digital exploration data can be effective if the statistical tests for the determination of the prospects are pertinent to the presence of the desired mineral. Where exploration involves the application of polynomial trend analysis to structure contour maps in the search for petroleum and natural gas, standard analysis of variance tests may not indicate the best exploration maps. Variance tests may be completely invalid where isolated dips and clustered samples cause the surfaces generated by some of the most common trend programs to oscillate, creating a false impression of variance. On the other hand, tests that directly compare the position of residual features with areas of known production consistently indicate the best map for the determination of new prospects. They are simple to apply and appear to offer the most opportunity for the automatic recognition of prospective areas.  相似文献