A twenty-three day twenty-mile echo record of fish behaviour     

Revie  J.; Wearden  G.; Hocking  P. D.; Weston  D. E. 《ICES Journal of Marine Science》1974,36(1):82-86

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Light curves of SZ Piscium for 1977 and 1978     

Joel A. Eaton  Franco Scaltriti  M. Cerruti-Sola  M. B. K. Sarma  B. D. Ausekar  Santo Catalano  Marcello Rodono 《Astrophysics and Space Science》1982,82(2):289-306

We present a relatively completeV-band light curve of SZ Psc for 1978 and a partial light curve for 1977. From the 1978 light curve we derive a new time of primary minimum, JD2443823.674±0.001, and a Russell-model solution,i=75°.8±0°.1,r _h =0.096±0.003,r _c =0.351±0.001, andL _h =0.253±0.002. The hotter component of this system is a F5-8 main-sequence star, the cooler component a K3-4 star well above the main sequence. The system is detached with the larger component filling only 82% of its Roche lobe. The distortion wave in this RS CVn-type binary seems not to migrate regularly as do those in many other such systems, but rather seems to change phase and amplitude more erratically. Between 1977 and 1978 its phase stayed practically constant while its amplitude decreased by a factor of three. We discuss the implications of this behavior for the spot model of RS CVn-type activity. We find that the traditional comparison star for SZ Psc, HD 219018, is very likely a constant star contrary to a recent suggestion that it is variable. Its brightness and colors,V=7.705, (B-V)=0.628, and (V-I) _c =0.688, are those of a G2V star.Visiting Astronomer, Kitt Peak National Observatory, which is operated by AURA, Inc., under contract with the National Science Foundation, and Visiting Astronomer, Prarie Observatory, University of Illinois.  相似文献   

Ratios of stable carbon isotopes in some High Arctic plants and lake sediments   总被引：1，自引：0，他引：1  

Weston Blake Jr. 《Journal of Paleolimnology》1991,6(2):157-166

¹³C/¹²C ratios for a number of High Arctic vascular plants (51 determinations), mosses (11), and freshwater algae (11) show considerable variation, particularly among the freshwater algae (range from-6.9 to -36.3). In some cases the stable carbon ratios on modern and fossil materials provide guidance as to whether marine waters formerly occupied a given pond or lake basin. In other cases the ¹³C values for algae collected along the present-day shore of a pond or lake bear no relation to the values obtained on constituents preserved within the bottom sediments, suggesting that major changes have occurred in the last few thousand years.Geological Survey of Canada Contribution No. 17291. Contribution No. 41 from the Cape Herschel Project.  相似文献   

Adaptation of seismic skeletonization for other geoscience applications     

K. Vasudevan  D. Eaton  F. A. Cook 《Geophysical Journal International》2005,162(3):975-993

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Dispersion of salt and suspended sediment in a partly mixed estuary     

R. J. Uncles  R. C. A. Elliott  S. A. Weston 《Estuaries and Coasts》1985,8(3):256-269

Observations are presented of the transverse and vertical structure of residual water, salt and sediment transport in the upper reaches of a partly mixed estuary. Measurements were made over spring and neap tidal cycles at three sections. The residual transport for each variable exhibited a characteristic transverse structure. This structure is interpreted in terms of fundamental physical processes. The results are used to estimate the relative importance of transverse shear, vertical shear and tidal pumping to the axial dispersion of salt and sediment.  相似文献   

On the desertification of the Sahel zone     

G. Wendler  F. Eaton 《Climatic change》1983,5(4):365-380

Ground based measurements which were carried out in the Northern Sahel in southern Tunisia showed the following results:

1. The albedo difference between ground and protected land is about 10%, half of the amount Charney (1975) used in his model.
2. Bare soil is always warmer during times of bright sunshine than vegetated soil, which is in agreement with Jackson and Idso (1975). Temperature differences in excess of the 10 °C were observed between plants and the surrounding soil.
3. For bare soil, the surface temperature increases with declining albedo. However the opposite holds true for plants. Here, when lowering the albedo, a decrease in temperature was found.
4. In a sand dune field, the surface temperature depends strongly on the exposure. Surface temperature differences of 8 °C were observed for slopes of different exposures for measurements carried out around noon.

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Seismic anisotropy beneath Dronning Maud Land, Antarctica, revealed by shear wave splitting   总被引：1，自引：0，他引：1  

Bettina Bayer  Christian Müller  David W. Eaton  Wilfried Jokat 《Geophysical Journal International》2007,171(1):339-351

Shear wave splitting analyses have been carried out using teleseismic data from broad-band seismograph stations deployed at temporary and permanent locations in Dronning Maud Land (DML), Antarctica. In most cases, the observed anisotropy can be related to major tectonic events that formed the present-day Antarctic continent. We rule out an anisotropic contribution from recent asthenospheric flow. At the Russian base Novolazarevskaya near the coast in central DML, waveform inversion suggests a two-layer model where the fast direction of the upper layer is oriented parallel to Archean fabrics in the lithosphere, whereas the anisotropy of the lower layer is interpreted to have been created during the Jurassic Gondwana break-up. Recordings at the South African base Sanae IV, however, show enigmatic results. For narrow backazimuthal segments, splitting parameters show strong variations together with a multitude of isotropic measurements, indicative of complex scattering that cannot be explained by simple one- or two-layer anisotropic models. In the interior of the continent, the data are consistent with single-layer anisotropy, but show significant spatial variations in splitting parameters. A set of temporary stations across the Heimefront shear zone in western DML yield splitting directions that we interpret as frozen anisotropy from Proterozoic assembly of the craton. An abrupt change in fast axis direction appears to mark a suture between the Grunehogna craton, a fragment of the Kalahari–Kaapvaal craton in southern Africa and the Mesoproterozoic Maudheim Province.  相似文献   

Historic storms of the North Sea, British Isles and Nortwest Europe : H. Lamb, Cambridge University Press, Cambridge, UK, 1991. xi + 204 pp., hardcover, £55 (US$95), ISBN 0-521-37522-3     

Keith Weston 《Dynamics of Atmospheres and Oceans》1992,16(6)

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On the standardization of geophysical observations at volcanoes     

J. P. Eaton 《Bulletin of Volcanology》1964,27(1):417-419

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Leachable trace elements in San Francisco bay sediments: Indicators of sources and estuarine processes     

Andrew Eaton 《Environmental Geology》1978,2(6):333-339

Geographic variations of leachable Fe, Mn, Cu, Zn, Co, and Ni in San Francisco Bay sediments indicate that Fe, Mn, Co, and Ni are all predominantly supplied to bay sediments from the San Joaquin-Sacramento River system, with little evidence for direct contributions from municipal and industrial sources. In contrast, both Cu and Zn have significant sources within the Bay system, probably municipal and industrial discharges. Precipitation and coagulation of Fe oxides in the low-salinity region of the estuary results in significantly greater concentrations of that element in the most landward portion of the estuary. Co and Ni appear to be actively coprecipitating with Fe but their distributions are also influenced by other factors. Mn is not a major geochemical agent in this system. Its pattern is different from the other elements and it does not account for any of the other elemental variance. The behavior of Cu and Zn is affected not only by the presence of nonriverine sources but also through surface-active processes and organic complexing, coupled with the transportation of fine-grained sediment.  相似文献