Book Review An Introduction by Wilfried Brutsaert, Cambridge University Press, 2005     

Marek Lewandowski 《Pure and Applied Geophysics》2009,166(4):729-730

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Book Review: Introduction to Geomagnetic Fields by Wallace H. Campbell     

Marek Lewandowski 《Pure and Applied Geophysics》2009,166(3):513-514

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Internal solitary wave-induced flow over a corrugated bed     

Magda Carr  Marek Stastna  Peter A. Davies 《Ocean Dynamics》2010,60(4):1007-1025

A combined numerical and experimental study of the propagation of an internal solitary wave (ISW) over a corrugated bed is presented, in which the amplitude and the wavelength of the corrugated bed, together with the wave amplitude and wave speed of the ISW, have been varied parametrically. Both ISWs of elevation and depression have been considered. The wave-induced currents over the corrugated bed cause flow separation at the apex of the corrugations and a sequence of lee vortices forms as a result. These vortices develop fully after the main wave has passed over the topographic feature, resulting in deformation of the overlying pycnocline and, in some instances, significant vertical mixing. It is found that the intensity of the vortex formation is dependent on both the amplitude and wavelength of the bottom topography. In the case of an ISW of depression, the generation of vertically (upward)-propagating vortices is seen to result in entrainment of fluid from a bottom boundary jet (Carr and Davies, Phys Fluids 18:016601, 2006), while, in the elevation case, a second mechanism is present to induce significant turbulent mixing in the water column. It occurs when the bottom corrugations reach into, or are very near, the pycnocline at rest. Large waves of elevation that are stable on approach to the corrugations exhibit evidence of a spatio-temporally developing shear instability as they interact with the bottom corrugation. The shear instability takes the form of billows that have a vertical extent that can reach 50% of the wave amplitude.  相似文献   

On Methods for the Light Curves Extrema Determination     

Zdeněk Mikulášek  Marek Wolf  Miloslav Zejda  Petra Pecharová 《Astrophysics and Space Science》2006,304(1-4):363-365

We present two methods for the determination of moments of extrema and their errors appropriate for the analysis of light variations of variable objects. The method I is suitable for determination of times of extrema of non-periodical variables or objects, whose light curves vary. The method II is apt for O-C analyses of objects whose light curves are more or less repeating. Both methods are displayed on the analysis of BL Cam light variations and compared with the Kwee-van Woerden method.  相似文献   

Study of the field of a point harmonic source ofSH-waves in a stratified medium and in a medium with a corrugated interface by finite difference methods     

Jiří Nedoma  Karel Pěč  Reviewer I. Marek 《Studia Geophysica et Geodaetica》1971,15(3-4):288-298

Summary The paper presents a numerical solution of the propagation of SH-waves in a stratified and corrugated medium using the finite difference method. There the problem of a suitable choice of mesh is also discussed.  相似文献   

Application of a relativistic accretion disc model to X-ray spectra of LMC X-1 and GRO J1655-40   总被引：1，自引：0，他引：1  

Marek Gierli&#;ski †  rzej Macio&#;ek-Nied&#;wiecki  Ken Ebisawa ‡ 《Monthly notices of the Royal Astronomical Society》2001,325(3):1253-1265

We present a general relativistic accretion disc model and its application to the soft-state X-ray spectra of black hole binaries. The model assumes a flat, optically thick disc around a rotating Kerr black hole. The disc locally radiates away the dissipated energy as a blackbody. Special and general relativistic effects influencing photons emitted by the disc are taken into account. The emerging spectrum, as seen by a distant observer, is parametrized by the black hole mass and spin, the accretion rate, the disc inclination angle and the inner disc radius.
We fit the ASCA soft-state X-ray spectra of LMC X-1 and GRO J1655-40 by this model. We find that, having additional limits on the black hole mass and inclination angle from optical/UV observations, we can constrain the black hole spin from X-ray data. In LMC X-1 the constraint is weak, and we can only rule out the maximally rotating black hole. In GRO J1655-40 we can limit the spin much better, and we find 0.68 a 0.88 . Accretion discs in both sources are radiation-pressure dominated. We do not find Compton reflection features in the spectra of any of these objects.  相似文献   

Provenance implications of Th–U–Pb electron microprobe ages from detrital monazite in the Carboniferous Upper Silesia Coal Basin, Poland     

Monika Agnieszka Kusiak  Artur K&#x;dzior  Mariusz Paszkowski  Kazuhiro Suzuki  Ignacio Gonzlez-lvarez  Boles&#x;aw Wajsprych  Marek Doktor 《Lithos》2006,88(1-4):56-71

This paper reports the results of CHIME (chemical Th–U–Pb isochron method) dating of detrital monazites from Carboniferous sandstones in the Upper Silesia Coal Basin (USCB). A total of 4739 spots on 863 monazite grains were analyzed from samples of sandstone derived from six stratigraphic units in the sedimentary sequence. Age distributions were identified in detrital monazites from the USCB sequence and correlated with specific dated domains in potential source areas. Most monazites in all samples yielded ca. 300–320 Ma (Variscan) ages; however, eo-Variscan, Caledonian and Cadomian ages were also obtained. The predominant ages are comparable to reported ages of certain tectonostratigraphic domains in the polyorogenic Bohemian Massif (BM), which suggests that various crystalline lithologies in the BM were the dominant sources of USCB sediments.  相似文献   

Compositional variations of zirconolite from the Evate apatite deposit (Mozambique) as an indicator of magmatic-hydrothermal conditions during post-orogenic collapse of Gondwana     

Hurai  Vratislav  Huraiová  Monika  Gajdošová  Michaela  Konečný  Patrik  Slobodník  Marek  Siegfried  Pete R. 《Mineralogy and Petrology》2018,112(3):279-296

Mineralogy and Petrology - Zirconolite is documented from the Evate apatite-magnetite-carbonate deposit in the circular Monapo Klippe (eastern Mozambique)—a relic of Neoproterozoic nappe...  相似文献   

Comment on the Seismic Method Depth-Recursive Tomography on Grid (DRTG) Developed by Miroslav Novotný and Recently Published in Three Papers in Surveys in Geophysics     

Pavla Hrubcová  Piotr Środa  Václav Vavryčuk  Vladislav Babuška  Marek Grad 《Surveys in Geophysics》2013,34(4):521-529

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Deciphering interaction of regional aquifers in Southern Tunisia using hydrochemistry and isotopic tools     

Kamel Abid  Marek Dulinski  Friha Hadj Ammar  Kazimierz Rozanski  Kamel Zouari 《Applied Geochemistry》2012

Groundwater is the most important source of water supply in southern Tunisia. Previous hydrogeologic and isotopic studies carried out in this region revealed the existence of two major aquifer systems: the “Complex Terminal” (CT) and the “Continental Intercalaire” (CI). Turonian carbonates constitute one of the major aquifer levels of the CT multilayered aquifer. It extends over most of southern Tunisia, and its hydrodynamic regime is largely influenced by tectonics, lithology and recharge conditions. Forty-eight groundwater samples from the CI and Turonian aquifers were collected between January and April 2004 for chemical and isotopic analyses. Hydrochemistry and isotopic tools were combined to get an insight into the processes controlling chemical composition of groundwater and wide-scale interaction of these two aquifer systems. Analysis of the dissolved constituents revealed that several processes control the observed chemical composition: (i) incongruent dissolution of carbonate minerals, (ii) dissolution of evaporitic minerals, and (iii) cation exchange. Dissolution alone cannot account for the observed high supersaturation states of groundwater with respect to calcite and dolomite. The observed supersaturation is most probably linked to geogenic CO₂ entering water-bearing horizons of the CT and CI aquifers via deep tectonic faults and discontinuities and subsequent degassing in the exploitation wells. Presence of geogenic CO₂ in the investigated region was confirmed by C isotope data of the DIC reservoir. The radiocarbon content of the Turonian samples varied between 9.5 and 43 pmc. For CI samples generally lower values were recorded, between 3.8 and 22.5 pmc. Stable isotope composition of Turonian groundwater samples varied from −8.3 to −5.3‰ for δ¹⁸O and from −60 to −25‰ for δ²H. The corresponding ranges of δ values for the Continental Intercalaire samples were from −8.9‰ to −6.9‰ for δ¹⁸O and from −68.2‰ to −45.7‰ for δ²H. Stable isotope composition of groundwater representing CT and CI aquifers provide strong evidence for regional interaction between both systems.  相似文献