The 2dF Galaxy Redshift Survey: Wiener reconstruction of the cosmic web     

Pirin Erdo&#;du  Ofer Lahav  Saleem Zaroubi  George Efstathiou  Steve Moody  John A. Peacock  Matthew Colless  Ivan K. Baldry  Carlton M. Baugh  Joss Bland-Hawthorn  Terry Bridges  Russell Cannon  Shaun Cole  Chris Collins  Warrick Couch  Gavin Dalton  Roberto De Propris  Simon P. Driver  Richard S. Ellis  Carlos S. Frenk  Karl Glazebrook  Carole Jackson  Ian Lewis  Stuart Lumsden  Steve Maddox  Darren Madgwick  Peder Norberg  Bruce A. Peterson  Will Sutherland  Keith Taylor 《Monthly notices of the Royal Astronomical Society》2004,352(3):939-960

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Ray amplitudes of seismic body waves in laterally inhomogeneous media     

Vlastislav &#;ervený  Ivan P&#;en&#;ík 《Geophysical Journal International》1979,57(1):91-106

Summary . The most complicated part in the computation of ray amplitudes of seismic body waves in laterally inhomogeneous media with curved interfaces lies in the evaluation of the geometrical spreading. Geometrical spreading can be simply expressed in terms of the Jacobian J of the transformation from the Cartesian into ray coordinates. Several systems of ordinary differential equations to compute the function J are suggested. For general three-dimensional media, in which the velocity changes with all the three spatial coordinates, a system of three non-linear ordinary differential equations of the first order is derived. If the velocity does not depend on one coordinate, the system of equations reduces to only one non-linear differential equation. The initial conditions for these differential equations at point (or line) source and at points of intersection of the ray with curved interfaces are presented.  相似文献   

Perturbation from isotropic to anisotropic heterogeneous media in the ray approximation     

Robert L. Nowack  Ivan P&#;en&#;ik 《Geophysical Journal International》1991,106(1):1-10

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Editor's note     

Dr. Ivan Crkvenčić 《GeoJournal》1996,38(4):379-379

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Progressive Build Up Of Co 2 In The AtmosphereOf Venus Through Multiple Volcanic Resurfacing Events     

Lopez  Ivan  Oyarzun  Roberto  Marquez  Alvaro  Doblas-Reyes  Francisco  Laurrieta  Alejandro 《Earth, Moon, and Planets》1998,81(3):187-192

In absence of other mechanisms, the main input of CO₂into the Venusian atmosphere is via volcanic out gassing. Since Venus can be regarded as a planet-wide large igneous province, we can expect large quantities of CO₂ being transferred into its atmosphere via volcanic out gassing. We have quantified the maximum possible amount of CO₂ that can be out gassed via a single massive episode of resurfacing of the planet. This figure (5.6 × 10¹⁹ kg of CO₂) is about 8 times smaller than the total CO₂ present in the Venusian atmosphere (4.55 × 10²⁰ kg CO₂). The lack of planet-wide, efficient mechanisms for the recycling of CO₂ on Venus indicates that CO₂ has progressively accumulated in the atmosphere. Based on these considerations we suggest that the “equivalent” to eight global resurfacing episodes would be required to account for the present values of CO_{2 atmosphere}. This revised version was published online in July 2006 with corrections to the Cover Date.  相似文献   

Unique Windward Measurements and a Mesoscale Simulation of an Extremely Long-Lasting Severe Bora Event     

Golem  Petar  Toman  Ivan  Večenaj  Željko  Kozmar  Hrvoje  Grisogono  Branko 《Boundary-Layer Meteorology》2022,183(3):495-504

Boundary-Layer Meteorology - Unique data from a 100-m meteorological mast located on the windward side of the Dinaric Alps, Croatia, are compared to high-resolution Weather Research and Forecasting...  相似文献   

FICUS,a new in-situ probe for resistivity measurements in unconsolidated marine sediments     

Lauer-Leredde  Christine  Pezard  Philippe A.  Dekeyser  Ivan 《Marine Geophysical Researches》1998,20(2):95-107

Physical properties of shallow sediments measured at a particular site can not easily be extrapolated over a given profile. The number of samples required to define sediment properties adequately can then become time-consuming and expensive. Laboratory and in-situ experimentations have shown that electrical probing provides a useful complementary technique to extrapolate results from cores. These experiments have pointed out the need for quantitative, easily-transportable and fast resistivity measurements combining high vertical resolution with azimuthal resolution and full coverage, in the shallow subsurface. A new prototype probe called FICUS (Formation Imaging and Coring for Unconsolidated Sediments) has been developed to bridge this gap. FICUS is designed to provide in-situ high resolution electrical resistivity images of the upper few meters of shallow unconsolidated sediments.Laboratory experiments have been completed to test the feasibility of this technique to provide resistivity images of unconsolidated sediments. Laboratory images agree with theoretical predictions from numerical modelling. The obtained cm-scale resolution could be used for petrophysical and sedimentary purposes. The probe may offer additional information about changes in porosity and pore morphology caused by climatic cycles, since electrical resistivity is known to be especially sensitive to these changes. The probe could also allow to detect and map organic pollutants in the future.  相似文献   

On the formation of short-lived,toxic, water-soluble compounds during illumination of crude oil on seawater     

Leiv K. Sydnes  Ivan C. Burkow  Anne Stene  Sunniva Lønning 《Marine environmental research》1985,16(2):115-126

The toxicity of various oil extracts has been studied using cod eggs as test organisms. The most toxic effect was observed when the eggs were kept underneath the water/oil interface during irradiation. This supports the notion that toxic primary photoproducts with a short life-time are generated when oil on seawater is illuminated.  相似文献   

Tandem hydrofoil system     

Konstantin I. Matveev  Ivan Ivanovich Matveev 《Ocean Engineering》2001,28(2):963

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Numerical simulation of artificial ground freezing in a fluid-saturated rock mass with account for filtration and mechanical processes     

Ivan A. Panteleev  Anastasiia A. Kostin  Oleg A. Plekhov  Lev Yu. Levin 《寒旱区科学》2017,9(4):363-377

This study is devoted to the numerical simulation of the artificial ground freezing process in a fluid-saturated rock mass of the potassium salt deposit. A coupled model of nonstationary thermal conductivity, filtration and thermo-poroelasticity, which takes into account dependence of the physical properties on temperature and pressure, is proposed on the basis of the accepted hypotheses. The considered area is a cylinder with a depth of 256 meters and diameter of 26.5 meters and includes 13 layers with different thermophysical and filtration properties. Numerical simulation was carried out by the finite-element method. It has been shown that substantial ice wall formation occurs non-uniformly along the layers. This can be connected with geometry of the freezing wells and with difference in physical properties. The average width of the ice wall in each layer was calculated. It was demonstrated that two toroidal convective cells induced by thermogravitational convection were created from the very beginning of the freezing process. The effect of the constant seepage flow on the ice wall formation was investigated. It was shown that the presence of the slow flow lead to the delay in ice wall closure. In case of the flow with a velocity of more than 30 mm per day, closure of the ice wall was not observed at all in the foreseeable time.  相似文献