Atlases of geothermal waters and energy resources in Poland     

Wojciech Górecki  Anna Sowiżdżał  Marek Hajto  Anna Wachowicz-Pyzik 《Environmental Earth Sciences》2015,74(12):7487-7495

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The cosmological constant—a brief history and recent results     

Marek?DemiańskiEmail author  Ester?Piedipalumbo 《Astronomy Reports》2015,59(6):484-490

We briefly review the history of the cosmological constant. Recently discovered accelerated expansion epoch of the universe placed the problem of the cosmological constant at a forefront of interest of astronomers and physicists. Short account of recent developments is given.  相似文献   

The Younger Dryas climatic conditions in the Za Mnichem Valley (Polish High Tatra Mountains) based on exposure‐age dating and glacier‐climate modelling     

Michał Makos  Jerzy Nitychoruk  Marek Zreda 《Boreas: An International Journal of Quaternary Research》2013,42(3):745-761

Cosmogenic ³⁶Cl was measured in bedrock and moraine boulders in the Za Mnichem Valley (High Tatra Mountains). The post‐LGM deglaciation of the study area occurred about 15.9 ka ago. The northernmost part of the valley slopes was ice‐free around 15 ka ago. The terminal moraine on the valley threshold was finally stabilized 12.5 ka ago during the Younger Dryas cold event (Greenland Stadial 1). At that time, the Za Mnichem glacier was 1.3 km long and had an area of 0.57 km². The AAR equilibrium line of the glacier was located at 1990 m a.s.l., which corresponds to an ELA depression of ～500 m compared to today. The mean summer temperature was colder by 4°–4.5°C than the present‐day temperature. The mean annual temperature was colder by 6°C than today. Such conditions suggest a decrease of the annual precipitation by ～15–25% compared with the present‐day annual average. These data indicate a probable uniform temperature change across central and western Europe, with the precipitation being the most significant factor affecting the mass balance of mountain glaciers. The spatial distribution of balance data suggests increasing continentality towards the east during the Younger Dryas.  相似文献   

Geoenvironmental problems and crossborder cooperation in Central America     

Marek Graniczny Dr Jonas satkunas Jurga Lazauskiene Jiri Sebesta 《《幕》》2006,29(2):136-138

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Modeling of cometary evolution by kinetic theory: Method and first results     

Marek Banaszkiewicz  Hans Rickman 《Earth, Moon, and Planets》1995,71(3):203-210

Physical evolution of Jupiter family (JF) comets is considered as a simultaneous process of erosion and fading. Dynamical effects are limited to discrete changes of the perihelion distance, that result in changes of the evaporation rate. Assuming that the JF comet population is in a steady state, a distribution function of this population in the two dimensional phase space consisting of radius and active fraction of the nucleus surface is found as the solution of a set of kinetic equations, each one of them for a different perihelion distance. With use of the distribution function some statistical properties of the comet population, like the total number of comets in the considered region of the phase space, the number of objects that evaporate or get dormant per unit time, etc., are obtained. The cumulative distribution function with respect to the absolute brightness is calculated and compared with the observed one as a check on the considered models.  相似文献   

Radiants of the Leonids 1999 and 2001 Obtained by Lltv Systems Using Automatic Software Tools     

Detlef Koschny  Jorge Diaz del Rio  Rodrigue Piberne  Marek Szumlas  Joe Zender  André Knöfel 《Earth, Moon, and Planets》2004,95(1-4):255-263

Both amateur and professional meteor groups are more frequently using Low-Light level TV (LLTV) systems to record meteors. Double-station observations can yield orbit data. However, data analysis normally is still done by hand and thus time consuming. This paper addresses the question of whether available automated tools can be used to determine reasonably accurate orbits with minimum human intervention. The European Space Agency performed several observing campaigns to observe the Leonid meteor stream. In November 1999, the ESA meteor group was stationed at two locations in Southern Spain, in November 2001 at two stations close to Broome in North-Western Australia. Double-station observations with LLTV systems were conducted. The data was recorded on S-VHS video tapes. The tapes were processed using automatic detection software from which meteor heights, velocities and radiants were computed. This paper shows the results for the two maximum nights. The radiants determined in 1999 show a very large scatter due to unfortunate observing geometry and inaccurate position determination since one of the cameras was moving because of the wind. The 2001 data is excellent and the radiant was determined to be at RA = 153.96°±0.3° and Dec = 21.09°±0.2°. The error bars for individual meteor radiants are about 0.2° to 0.4°. This demonstrates that is indeed possible to determine good radiant positions using totally automated tools. Orbits, on the other hand, are not well defined due to the fact that the velocity of individual meteors shows large errors. Reasons for this are described.  相似文献   

High-resolution radio observations of Seyfert galaxies in the extended 12-μm sample – II. The properties of compact radio components     

Andy Thean  Alan Pedlar  Marek J. Kukula  Stefi A. Baum  Christopher P. O'Dea 《Monthly notices of the Royal Astronomical Society》2001,325(2):737-760

We discuss the properties of compact nuclear radio components in Seyfert galaxies from the extended 12-μm AGN sample of Rush et al. Our main results can be summarized as follows.
Type 1 and type 2 Seyferts produce compact radio components which are indistinguishable in strength and aspect, indicating that their central engines are alike, as proposed by the unification model. Infrared IRAS fluxes are more closely correlated with low-resolution radio fluxes than high-resolution radio fluxes, suggesting that they are dominated by kiloparsec-scale, extranuclear emission regions; extranuclear emission may be stronger in type 2 Seyferts. Early-type Seyfert galaxies tend to have stronger nuclear radio emission than late-type Seyfert galaxies. V-shaped extended emission-line regions, indicative of 'ionization cones', are usually found in sources with large, collimated radio outflows. Hidden broad lines are most likely to be found in sources with powerful nuclear radio sources. Type 1 and type 2 Seyferts selected by their IRAS 12-μm flux densities have well-matched properties.  相似文献   

8.4 GHz VLA observations of the CfA seyfert sample     

Marek J. Kukula  Alan Pedlar  S. W. Unger  S. Baum  C. O'Dea 《Astrophysics and Space Science》1994,216(1-2):371-372

We present the results of an 8.4 GHz VLA survey of the CfA Seyferts. We find that the luminosity functions for Seyfert 1s and 2s are essentially identical, but that the type 2 objects are more likely to contain extended radio structures. This seems to be consistent with unified models for Seyferts, in which the differences between the two classes are largely due to orientation effects.  相似文献   

Experiences in teaching mathematical geology at the university of mining and metallurgy in Kraków, Poland     

Janusz Kotlarczyk  Marek Nie? 《Mathematical Geology》1976,8(3):331-336

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Book reviews     

P. Mayer  Marek Wolf 《Earth, Moon, and Planets》1994,65(2):197-198

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