Tracing groundwater flow using chemical data     

I. VARSÁNYI 《水文科学杂志》2013,58(3):265-275

Abstract

In the southern part of the Great Hungarian Plain there are two different groundwater flow systems located in the study area. Between these two systems there is a narrow groundwater divide where groundwater flow cannot be detected. In the western part, groundwater of greater hardness moves from the northwest, west and southwest. In the eastern part, groundwater flow is from southeast to northwest. The directions of groundwater flow have been established on the basis of dissolved mono- and di-valent cation concentrations. The major direction of groundwater flow detected by a statistical evaluation of water chemical data agrees with previous geological investigations.  相似文献   

Filter design for GOCE gravity gradients     

Zs. Polgár  L. Sujbert  P. Asbóth  J. Ádám 《国际地球制图》2013,28(1):28-36

The GOCE satellite observes gravity gradients with unprecedented accuracy and resolution. The GOCE observations are reliable within a well-defined measurement bandwidth. In this study, different finite and infinite impulse response filters have been designed to obtain the demanded pass. Exhaustive time and frequency domain investigations prove that the proposed infinite impulse response filter can be a real competitor of the existing solution of the filtering problem.  相似文献   

Feasibility of Solid‐State Fermentation Using Spent Fungi‐Substrate in the Biodegradation of PAHs     

Emilio Rosales  Marta Pazos  M. Ángeles Sanromán 《洁净——土壤、空气、水》2013,41(6):610-615

The ability of Trametes versicolor and Pleurotus ostreatus to grow on agroindustrial wastes, such as orange peels, and to degrade model polycyclic aromatic hydrocarbons (PAHs) in solid‐state fermentation (SSF) was evaluated. Best results in laccase production were obtained with T. versicolor cultures (3000 U L^?1), however, P. ostreatus (2700 U L^?1) showed higher ability to degrade the tested PAHs phenanthrene (PHE) and pyrene (PYR). Moreover, orange peels can be used as biofertilizer and the oxidative ability of the spent fungus and substrate obtained in SSF can be used in the remediation of polluted soil. The results obtained confirm this hypothesis. Thus, the decontamination achieved in soils polluted with PYR was around 43% (after 30 days) by addition of spent fungus and substrate from SSF.  相似文献   

On the Asynchronous Rotation of Accretors in Interacting Binaries     

Augustin Skopal  Richard KomžÍk  MÁria CsatÁryová 《Astrophysics and Space Science》2005,296(1-4):427-430

We show that the gaining component in interacting binaries can rotate faster than its orbital revolution as a consequence of the accretion process. We derive an approximative analytical formula for the Roche lobe radius of asynchronously rotating accretors. We present the case of the semi-detached interacting binary TX UMa, for which we measured directly asynchronous rotation of its accretor. We suggest a method to detect indirectly a fast spinning of accretors in symbiotic binaries based on the the X-ray luminosity of the boundary layer. We demonstrate this possibility for the case of EG And.  相似文献   

Computation of X-Ray Blazar Light Curves Using RHD Simulations     

Petar Mimica  Miguel-Ángel Aloy  Ewald Müller  Wolfgang Brinkmann 《Astrophysics and Space Science》2004,293(1-2):165-172

We present the results of a two-dimensional relativistic hydrodynamic simulation of collisions of dense shells of matter moving within a uniform jet. The non-thermal synchrotron radiation produced by the relativistic electrons injected at shocks is computed following their temporal and spatial evolution. We test different parameterizations of the shock acceleration process and compute the corresponding X-ray light curves. A time lag between hard and soft X-ray radiation is found. The collision has an efficiency of few times 10^?3 in converting kinetic energy into radiation.  相似文献   

JOINT LIGHTCURVE OBSERVATIONS OF 10 NEAR-EARTH ASTEROIDS FROM MODRA AND ONDŘEJOV     

A. GALÁD  P. PRAVEC  P. KUŠNIRÁK  Š. GAJDOŠ  L. KORNOŠ  J. VILÁGI 《Earth, Moon, and Planets》2005,97(1-2):147-163

The effort in photometry of near-Earth asteroids (NEAs) at Modra Observatory has been enhanced following a recent collaboration with Ondřejov Observatory. We present a part of our collaborative work on measuring rotation lightcurve data for 10 NEAs. We derived following synodic periods P and amplitudes of their composite lightcurves: (3553), 3.1944 h, 0.08 mag; (22753), 10.24 h, 0.11 mag; (31669), 5.807 h, 0.07–0.27 mag; (40267), 4.9568 h, 1.01–1.11 mag; (66146), 2.3774 h, 0.12–0.15 mag; (88188), 2.6906 h, 0.06 mag; (103067), 9.489 h, 0.49 mag; 2001 CB₂₁, 3.302 h, 0.19 mag; 2004 LJ₁, 2.7247 h, 0.17–0.59 mag; 2004 XO₁₄, 8.417 h, 0.19–0.25 mag. While the derived periods are unique (the reliability code U=3) for most of the objects, those of (3553), (22753) and 2001 CB₂₁ are somewhat less reliable (U=2). We checked all the U=3 data for deviations from strict periodicity, but found no significant attenuation that would indicate the presence of a satellite. Absolute magnitudes in Cousins R band (H _R ) were derived for (3553), 16.05; (40267), 15.59; (88188), 16.04; 2004 XO₁₄, 15.84; errors of the first three H _R estimates are 0.20 mag, but that of 2004 XO₁₄ is <0.10 mag.  相似文献   

Black crusts on travertine: factors controlling development and stability     

Ákos Török 《Environmental Geology》2008,56(3-4):583-594

The travertine buildings of Budapest show extensive black crust formation, which is related to high concentration of atmospheric pollution and a continental climate. Laminar black crusts, framboidal black crusts and leached white surfaces are compared. Physical properties (Schmidt hammer rebound, Duroscope rebound), mineralogical composition and elemental composition are measured. Framboidal black crusts contain more than 50% of acicular gypsum. The crust surface displays idiomorphic rosette-like gypsum crystals with particulates, calcite and gypsum crystal aggregates. The sulphur isotopic composition of the black crusts pinpoints the involvement of rain and dust in crust formation. Thick framboidal black crust has the lowest strength while thin laminar black crust and white dissolved surfaces show minor decrease in surface strength compared to unaltered travertine. The crusts adhere to the travertine surface and rarely show mechanical decay forms that are typical features of porous limestone ashlars in Budapest.  相似文献   

Sedimentary processes in a submarine canyon excavated into a temperate‐carbonate ramp (Granada Basin,southern Spain)     

ÁNGEL PUGA‐BERNABÉU  JOSÉ M. MARTÍN  JUAN C. BRAGA 《Sedimentology》2008,55(5):1449-1466

During the Late Tortonian, shallow‐water temperate carbonates were deposited in a small bay on a gentle ramp linked to a small island (Alhama de Granada area, Granada Basin, southern Spain). A submarine canyon (the ‘Alhama Submarine Canyon’) developed close to the shoreline, cross‐cutting the temperate‐carbonate ramp. The Alhama Submarine Canyon had an irregular profile and steep slopes (10° to 30°). It was excavated in two phases reflected by two major erosion surfaces, the lowermost of which was incised at least 50 m into the ramp. Wedge‐shaped and trough‐shaped, concave‐up beds of calcareous (terrigenous) deposits overlie these erosional surfaces and filled the canyon. A combination of processes connected to sea‐level changes is proposed to explain the evolution of the Alhama Submarine Canyon. During sea‐level fall, part of the carbonate ramp became exposed and a river valley was excavated. As sea‐level rose, river flows continued along the submerged, former river‐channel, eroding and deepening the valley and creating a submarine canyon. At this stage, only some of the transported conglomerates were deposited locally. As sea‐level continued to rise, the river mouth became detached from the canyon head; littoral sediments, transported by longshore and storm currents, were now captured inside the canyon, generating erosive flows that contributed to its excavation. Most of the canyon infilling took place later, during sea‐level highstand. Longshore‐transported well‐sorted calcarenites/fine‐grained calcirudites derived from longshore‐drift sandwaves poured into and fed the canyon from the south. Coarse‐grained, bioclastic calcirudites derived from a poorly sorted, bioclastic ‘factory facies’ cascaded into the canyon from the north during storms.  相似文献   

Predicting monthly precipitation along coastal Ecuador: ENSO and transfer function models     

de Guenni  Lelys B.  García  Mariangel  Muñoz  Ángel G.  Santos  José L.  Cedeño  Alexandra  Perugachi  Carlos  Castillo  José 《Theoretical and Applied Climatology》2017,129(3-4):1059-1073

Theoretical and Applied Climatology - It is well known that El Niño-Southern Oscillation (ENSO) modifies precipitation patterns in several parts of the world. One of the most impacted areas is...  相似文献   

Association of gold with uraninite and pyrobitumen in the metavolcanic rock hosted hydrothermal Au-U mineralisation at Rompas,Peräpohja Schist Belt,northern Finland     

Ferenc Molnár  Harry Oduro  Nick D. J. Cook  Esa Pohjolainen  Ágnes Takács  Hugh O’Brien  Lassi Pakkanen  Bo Johanson  Richard Wirth 《Mineralium Deposita》2016,51(5):681-702

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