Geochemistry and stable sulfur and oxygen isotope ratios of the Podwiśniówka pit pond water generated by acid mine drainage (Holy Cross Mountains, south-central Poland)     

Zdzis&#x;aw M. Migaszewski  Agnieszka Ga&#x;uszka  Stanis&#x;aw Ha&#x;as  Sabina Do&#x;&#x;gowska  Jzef D&#x;bek  Ewa Starnawska 《Applied Geochemistry》2008,23(12):3620-3634

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EPMA and PIXE dating of monazite in granulites from Stary Gierałtów, NE Bohemian Massif, Poland     

Monika A. Kusiak  Kazuhiro Suzuki  Daniel J. Dunkley  Janusz Lekki  Nonna Bakun-Czubarow  Mariusz Paszkowski  Bartosz Budzy&#x; 《Gondwana Research》2008,14(4):675

Chemical Th–U–total Pb (CHIME) dating of monazite by electron probe microanalyzer (EPMA) and proton microprobe (PIXE) was carried out on felsic granulites from Stary Gierałtów, Poland, which represent part of the Orlica-Śnieżnik Dome in the NE Bohemian Massif. Analyzed monazite is characterized by mosaic zoning rather than simple core-to-rim growth, and strontium contents of up to 750ppm. An isochron age of 347 ± 13Ma represents timing of amphibolite-facies metamorphism, in agreement with previously published estimates.  相似文献   

The Shilu Iron Ore Deposit in Hainan Province,South China: A Structurally and Hydrothermally Reworked and Re-Enriched Lake-Superior-Type BIF Iron Deposit     

XU De-ru  WANG Zhi-lin  XIAO Yong  LIU Zhao-lu  WANG Li  FU Qi-ji  WU Jun 《矿物学报》2009,29(Z1)

The Shilu iron ore deposit, located in the western Hainan Province, South China, is one of the most important iron-ore mining districts in China not only for its huge reserves of hematite- rich ores, but also for its potentially economic significance of associated metals of copper, cobalt, nickel, silver, lead and zinc, and of non-metals of dolomite, quartzite,barite,gypsum and sulfur.  相似文献   

Effects of coal storage in air on physical and chemical properties of coal and on gas adsorption     

Maria Mastalerz  Wilfrido Solano-Acosta  Arndt Schimmelmann  Agnieszka Drobniak 《International Journal of Coal Geology》2009,79(4):167-174

This paper investigates changes in the high-volatile bituminous Lower Block Coal Member from Indiana owing to moisture availability and oxidation in air at ambient pressure and temperature over storage time. Specifically, it investigates changes in chemistry, in surface area, and pore structure, as well as changes in methane and carbon dioxide adsorption capacities. Our results document that the methane adsorption capacity increased by 40%, whereas CO₂ adsorption capacity increased by 18% during a 13-month time period. These changes in adsorption are accompanied by changes in chemistry and surface area of the coal.The observed changes in adsorption capacity indicate that special care must be taken when collecting samples and preserving coals until adsorption characteristics are measured in the laboratory. High-pressure isotherms from partially dried coal samples would likely cause overestimation of gas adsorption capacities, lead to a miscalculation of coal-bed methane prospects, and provide deceptively optimistic prognoses for recovery of coal-bed methane or capture of anthropogenic CO₂.  相似文献   

Study of equatorial regions of Moon with the help of backscattering coefficient obtained from LRO data     

O P N CALLA  SHUBHRA MATHUR  MONIKA JANGID 《Journal of Earth System Science》2014,123(2):433-443

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Enhanced lifetime of atmospheric circulation types over Europe: fact or fiction?     

By MONIKA CAHYNOVÁ  RADAN HUTH 《地球，A辑:动力气象学与海洋学》2009,61(3):407-416

We analyse the lifetimes (persistence) of circulation types using 23 classifications (of which 18 are objective and 5 subjective) in the period 1957–2002 over Europe and its subregions. The objective catalogues are developed on the same gridded climatic data (ECMWF ERA-40 reanalysis) but differ in the classification method used and in the number of synoptic types. Significant seasonal trends in the lifetime (both positive and negative) are fairly scarce and are present in all seasons in the manual catalogues only. In the subjective Hess–Brezowsky catalogue, there is an abrupt shift toward higher persistence in 1986, whereas in the Hungarian manual catalogue, a smaller but significant negative shift took place in the same year. These statistical inconsistencies probably result from inhomogeneities in the subjective catalogues. Our results suggest that the increase in the persistence of circulation types reported recently in several papers for the Hess–Brezowsky catalogue is an artefact rather than a real feature.  相似文献   

Bacterial ancient DNA as an indicator of human presence in the past: its correlation with palynological and archaeological data     

Jacek Madeja  Agnieszka Wacnik  Agata Zyga  Elzbieta Stankiewicz  Ewa Wypasek  Witold Guminski  Krystyna Harmata 《第四纪科学杂志》2009,24(4):317-321

Palynological investigation is one of the most important tools for reconstructing past vegetation. Some plants have proved to be relatively sensitive indicators of human activity, but most of them are not specific. In this paper we propose a method which can be used for the verification of phases of anthropogenic impact on vegetation distinguished in pollen diagrams. In this work we adopted the existing molecular methods for tracking bacterial ancient DNA of Bifidobacterium and Bacteroides‐Prevotella (known as human‐ and cow‐specific genetic markers) in palynologically and archaeologically associated sediments. This method can be helpful in determining local human presence, especially in those time periods when pollen analysis has not always been very discriminating (Palaeolithic, Mesolithic) and at sites without archaeological evidence. Copyright © 2008 John Wiley & Sons, Ltd.  相似文献   

Types of Public Spaces: The Polish Contribution to the Discussion of Suburban Public Space     

Dorota Mantey  Agnieszka Kępkowicz 《The Professional geographer》2013,65(4):633-654

Intensive suburbanization, especially in postsocialist countries, and a deficiency of fully public spaces result in an increasingly complex mixture of different types of spaces of public functions. Where there is a deficiency of completely public spaces, their role can be enhanced by those places available to the public for a specified period of time and under certain circumstances. Such places are provided and maintained not only by the public but also by the private sector. This article explores the diversity of places of public character and looks for criteria that organize this diversity. It introduces a new typology that corresponds mainly to the suburbs and combines five criteria of categorization: intended users, time limits as to access, prevailing form of control, intended functions, and visual characteristics. The typology draws attention to the role of spaces not intended for all the public but for selected groups and that of spaces with time-limited access. Such semipublic places are consistent with the lifestyle of suburbanites and therefore play an increasingly important role in suburban social life.  相似文献   

Mercury content of the Springfield coal, Indiana and Kentucky     

James C. Hower  Maria Mastalerz  Agnieszka Drobniak  Jeffrey C. Quick  Cortland F. Eble  Matthew J. Zimmerer 《International Journal of Coal Geology》2005,63(3-4):205-227

With pending regulation of mercury emissions in United States power plants, its control at every step of the combustion process is important. An understanding of the amount of mercury in coal at the mine is the first step in this process. The Springfield coal (Middle Pennsylvanian) is one of the most important coal resources in the Illinois Basin. In Indiana and western Kentucky, Hg contents range from 0.02 to 0.55 ppm. The variation within small areas is comparable to the variation on a basin basis. Considerable variation also exists within the coal column, ranging from 0.04 to 0.224 ppm at one Kentucky site. Larger variations likely exist, since that site does not represent the highest whole-seam Hg nor was the collection of samples done with optimization of trace element variations in mind. Estimates of Hg capture by currently installed pollution control equipment range from 9–53% capture by cold-side electrostatic precipitators (ESP) and 47–81% Hg capture for ESP + flue-gas desulfurization (FGD). The high Cl content of many Illinois basin coals and the installation of Selective Catalytic Reduction of NO_x enhances the oxidation of Hg species, improving the ability of ESPs and FGDs to capture Hg.  相似文献   

Holocene environmental history in northwest Finnish Lapland reflected in the multi-proxy record of a small subarctic lake     

Krystyna Szeroczyńska  Andrzej Tatur  Jan Weckström  Michał Gąsiorowski  Agnieszka M. Noryśkiewicz  Elwira Sienkiewicz 《Journal of Paleolimnology》2007,38(1):25-47

A 2.5-m-long sediment core was retrieved from Lake Somaslampi, a small lake located in a kame field on the north slope of the Scandes Mountains in Finnish Lapland. Holocene environmental changes were inferred from the lithological, geochemical, pollen, diatom and Cladocera records stored in the lake sediment. The chronology was based on six radiocarbon AMS dates supported by a palynological control chronology. The sediment profile consists of a glacial sedimentary sequence truncated by a lacustrine one. A hiatus, tentatively correlated with climate cooling and advances of glaciers during the 8.2 ka yrs BP “Finse cooling Event”, occurs between these sequences. The glacial sequence was composed of fluvioglacial clastics, smoothly changing into glacio-lacustrine diatomaceous ooze deposited in a meromictic proglacial lake that covered the kame field. The meromixis was probably caused by the greater depth of the lake, the extended ice-cover, and the microbial mats covering large areas of the lake bottom. A distinct change in the biota of the glacio-lacustrine sediments indicates higher trophic conditions than during deposition of the fluvioglacial clastics. The late-Pleistocene vegetation was characterised by subarctic birch tundra vegetation (Betula–Salix–Ericaceae) with low biodiversity gradually changing to Betula–Pinus dominance in the early Holocene. The lake was deep and had a diatom inferred pH ~ 7 indicated also by the dominance of planktonic Cladocera. The base of the lacustrine sediment sequence (6,650–6,300 cal. BP) consisted of loess-rich sediment indicating an increase in eolian activity. This is also supported by the pollen record, which is dominated by more long-distant taxa such as Alnus and Pinus, and by the increased C/N ratio of the sediment. After the initial meromictic phase of the lake, an abrupt lowering of the water level occurred. Lake Somaslampi was isolated from the larger Pre-Lake Somas basin and became holomictic, shallow, much warmer and more productive, until the deterioration of climate around 3,000 yr BP and the increased input of clastics from the tundra soils. The vegetation followed the general climatic trend by gradually changing from the dominance of Betula and Pinus to the dominance of more tundra-related vegetation like Poaceae and Cyperaceae. However, the higher frequencies of planktonic Cladocera and centric diatoms in the most recent sediments indicates higher trophic conditions, increased turbulence and a prolonged ice-free period, which can possibly be linked to the recent climate warming especially in areas of higher altitude and latitude.  相似文献