An experimental confirmation of the gravitons?     

Attila Mészáros 《Astrophysics and Space Science》1989,158(2):353-355

If the gravity is not quantized and the metric tensor is a classical quantity, the contortion should exist, and exert empirically measurable effects—at least in principle. On the other hand, it is likely that the existence of gravitons leads to the non-existence of contortion.  相似文献   

Comments on “Monitoring soil erosion in Cappadocia region (Selime–Aksaray–Turkey)” by Yilmaz et al. (Environ Earth Sci 2012, 66:75–81)     

Attila Çiner  Mehmet Akif Sarıkaya  Erkan Aydar 《Environmental Earth Sciences》2013,70(4):1927-1931

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The online TÉKA database,an integrated approach to landmark inventorization     

László Kollányi  Attila Csemez  Sándor Jombach  Zsolt Szilvácsku 《国际地球制图》2013,28(1):80-94

The reduction of untouched areas and the increase in residential, agricultural and industrial areas have gained speed in recent decades. As a result of the changes, one can often observe the disappearance of landmarks that had been connected to production, habitation and transportation. The first step for the preservation of landmarks is their identification and inventorization. In the ordinary sense of the word, ‘landmarks’ mean the important landscape heritage of national history and culture, which need to be identified, protected and preserved for future generations. The purpose of the TÉKA project was to compile a landmark cadastral register that will contribute to the preservation of landscape-related and cultural heritage in Hungary. The landmark cadastral is a Wikipedia-like GIS-based web site. One of the novelties of the TÉKA database is that the data obtained from various sources are gathered in a common, online GIS and integrated into a uniform meta database.  相似文献   

OSL-dating the Quaternary landscape evolution in the Vértes Hills forelands (Hungary)     

Edit Thamó-Bozsó  Gábor Csillag  László I. Fodor  Pál M. Müller  Attila Nagy 《Quaternary Geochronology》2010,5(2-3):120-124

Fluvial, colluvial, and aeolian sediments were dated by optically stimulated luminescence (OSL) on quartz to improve the chronological framework for Quaternary sedimentation and landscape evolution in the forelands of the Vértes Hills (central Hungary). The separated quartz was suitable for age determination based on an OSL SAR protocol. Most samples have asymmetric equivalent dose distributions and OSL ages were calculated by the mean, central, and minimum D_e values. Considering geomorphology and earlier age data from the area, the central D_e values seem most appropriate for age calculation. A fan on the geomorphological level QV in the western foreland of the Vértes Hills was deposited 79–75 (±8) ka ago. In the south-eastern foreland an alluvial fan on level QIIb is at most 42 ± 4 ka old. Fluvial incision and aggradation occurred 16–10 (±1) ka ago on the geomorphic surface QIIa. Loess is 14 ± 1 ka old, and slope sedimentation was active 11–9 (±1) ka ago. Our OSL data demonstrate that in the north-western foreland of the Vértes Hills wind remained an important agent after the last glacial times, into the early Holocene (9–8 ± 1 ka) and was able to accumulate large aeolian dunes.  相似文献   

New Methods for Modeling Laterolog Resistivity Corrections   总被引：1，自引：1，他引：0  

Jadwiga Anna Jarzyna  Adam Cichy  Dezső Drahos  Attila Galsa  Maria Joanna Bała  Andrzej Ossowski 《Acta Geophysica》2016,64(2):417-442

The paper presents methods for laterolog response modeling. In Coulomb’s charges method, Laplace’s equation is solved for the electric field distribution in rock medium with internal boundaries between different resistivity layers. There, the boundary problem is reduced to Fred-holm integral equation of the second kind. The second method uses a finite element array to model apparent resistivity from laterolog. The task is treated as DC problem and the Laplace equation is solved numerically. The presented methods were applied to borehole data covering a typical stratigraphie section of the Fore-Sudetic Monocline in southwestern Poland. Apparent resistivity was calculated using the Coulomb’s charges method and alternatively modeled using a finite element method which gave similar results. Then, a series of linear corrections for borehole, shoulder bed, and filtration effects for apparent resistivity obtained by the Coulomb’s charges method demonstrated the feasibility of calculating true resistivity of virgin and invaded zones. The proposed methods provide a flexible solution in modeling which can be adapted to other logs.  相似文献   

Asteroid Confusions with Extremely Large Telescopes     

Gyula M. Szabó  Attila E. Simon 《Earth, Moon, and Planets》2009,105(2-4):227-234

Asteroids can be considered as sources of contamination of point sources and also sources of confusion noise, depending whether their presence is detected in the image or their flux is under the detection limit. We estimate that at low ecliptic latitudes, ≈10,000–20,000 asteroids/sq. degree will be detected with an E-ELT like telescope, while by the end of Spitzer and Herschel missions, infrared space observatories will provide ≈100,000 serendipitous asteroid detections. The detection and identification of asteroids is therefore an important step in survey astronomy.  相似文献   

Biogeochemistry of trace metals (Mn, Sr, Rb, Ba, Cu, Zn, Pb and Cd) in a river-wetland-lake system (Balaton Region, Hungary)     

Françoise Elbaz-Poulichet  Attila Nagy  Tibor Cserny  Piroska Pomogyi 《Aquatic Geochemistry》1996,2(4):379-402

Mn, Sr, Ba, Rb, Cu, Zn, Pb and Cd concentrations have been measured seasonally in the water and deposited sediments of the system comprising: Zala river (main input) — Lakes Kis-Balaton 1 and 2 (small artificial lakes created in a former bay of Lake Balaton) — Keszthely bay (hypertrophic part of Lake Balaton). The concentrations of the trace elements together with pH, alkalinity, dissolved cations (Ca²⁺, Mg²⁺, Na⁺, and K⁺), dissolved inorganic ligands (Cl^–, SO₄ ^2–), particulate Al, Ca, inorganic and organic carbon are used to assess the contamination of the study area and biogeochemical processes controlling trace element concentrations. Thermodynamic speciation calculations have also been utilized to enhance our understanding of the system. In the sediments Rb, Ba, Cu and Zn concentrations were mainly controlled by the abundance of the aluminosilicate fraction. Strontium was mainly associated with the calcium carbonate fraction. The aluminosilicate fraction constitutes a major sink for Mn and Cd but the concentration of these elements are also strongly related to calcite precipitation. The main processes that control the dissolved distribution of trace elements in the Balaton system were: solid phase formation (carbonate) for Mn; coprecipitation with calcite for Sr, Ba, Rb and possibly Mn and Cd; adsorption/desorption processes (pH dependent) for Zn and Pb; solubilization of Mn and precipitation of Cd and Cu in reed covered wetland areas where anoxic conditions were probably existing during the warm season. A preliminary budget of atmospheric and river input to Lake Balaton has also been outlined. Although Lake Balaton, is subjected to anthropogenic inputs mainly from agricultural and domestic activities, their impact on trace element concentrations in the Balaton system is very limited due to the efficiency of removal processes (i.e. adsorption and co-precipitation) and to high sedimentation rates and strong sediment re-suspension. Anthropogenic inputs are only detected for Pb.  相似文献   

Cyclicity in the Middle Eocene Yamak turbidite complex of the Haymana basin,Central Anatolia,Turkey     

Attila Çiner  Max Deynoux  Erdal Kosun 《International Journal of Earth Sciences》1996,85(4):669-682

The Haymana basin in central Anatolia (Turkey) formed on a Late Cretaceous to Middle Eocene fore-arc accretionary wedge. A sequential model is proposed for the 1-km-thick Lutetian Yamak turbidite complex (YTC) which is the youngest paleotectonic unit of the basin. The YTC represents a prograding submarine fan subdivided into three depositional sequences (DS), each several hundred meters thick. Each depositional sequence consists of a turbidite system (TS), with sandstone and conglomeratic sandstone beds alternating with mudstones, overlain by basin plain mudstones. In each turbidite system, the sandstone and mudstone sequential organization allows the distinction of smaller subdivisions, namely, basic sequences (BS) and basic units (BU), with each basic sequence being composed of several basic units. This subdivision, associated with a two-dimensional geometric reconstruction of the YTC, leads to a better understanding of the evolution in time and space of the submarine fan system. Lower to middle fan depositional lobes, and upper fan and slope channels, are represented. As a whole, the YTC progressed from a sand-poor to a sand-rich system. Depositional sequences (DS) of the YTC may correspond to third-order sea-level cycles of tectonic origin. Accordingly, fourth- and fifth-order cycles might be proposed for the BS and BU, respectively. However, partly because of the limited extent of exposures, the allocyclic origin of these finer subdivisions remains problematic.  相似文献   

On the perturbations of a sphere     

Attila Mészáros 《Astrophysics and Space Science》1986,124(2):403-406

Perturbations in a spherical island Universe are investigated. An illustrative model is presented; the spher is inhomogeneous but static. The stratification in matter distribution may occur in this model.  相似文献   

Ionospheric modeling using GPS data   总被引：1，自引：0，他引：1  

Zhizhao Liu  Susan Skone  Yang Gao  Attila Komjathy 《GPS Solutions》2005,9(1):63-66

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