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1.
Some ilmenite concentrates obtained from oleate flotation of ilmenite ores from NE Poland contain less than the required 45% TiO2 due to the presence of green spinels (hercynite and pleonaste). Such concentrates were further upgraded by different separation techniques. It was established at microlaboratory scale that magnetic, gravity and high-tension separations can provide qualified ilmenite concentrates with TiO2 recovery in the order of 50 to 80%. 相似文献
2.
Małgorzata Białek 《Acta Geophysica》2006,54(1):60-70
Long-term changes in total ozone time series for Arosa, Belsk, Boulder and Sapporo stations are examined. For each station
we analyze time series of the following statistical characteristics of the distribution of daily ozone data: seasonal mean,
standard deviation, maximum and minimum of total daily ozone values for all seasons. The iterative statistical model is proposed
to estimate trends and long-term changes in the statistical distribution of the daily total ozone data. The trends are calculated
for the period 1980–2003. We observe lessening of negative trends in the seasonal means as compared to those calculated by
WMO for 1980–2000. We discuss a possibility of a change of the distribution shape of ozone daily data using the Kolmogorov-Smirnov
test and comparing trend values in the seasonal mean, standard deviation, maximum and minimum time series for the selected
stations and seasons. The distribution shift toward lower values without a change in the distribution shape is suggested with
the following exceptions: the spreading of the distribution toward lower values for Belsk during winter and no decisive result
for Sapporo and Boulder in summer. 相似文献
3.
We conducted acoustical surveys with a horizontal beam transducer to detect fish and with a vertical beam transducer to detect depth and macrophytes in two typical shallow lakes along the middle and lower reaches of the Changjiang(Yangtze) River in November 2013. Both lakes are subject to active fish management with annual stocking and removal of large fish. The purpose of the study was to compare hydroacoustic horizontal beam estimates with fish landings. The preliminary results show that the fish distribution patterns dif fered in the two lakes and were af fected by water depth and macrophyte coverage. The hydroacoustically estimated fish biomass matched the commercial catch very well in Niushan Lake, but it was two times higher in Kuilei Lake. However, acoustic estimates included all fish, whereas the catch included only fish 45 cm(smaller ones were released). We were unable to determine the proper regression between acoustic target strength and fish length for the dominant fish species in the two lakes. 相似文献
4.
Marcin Słowik Tadeusz Sobczyński Zygmunt Młynarczyk 《Environmental Earth Sciences》2010,59(5):957-966
Research concerning chemical constitution of alluvial sediments was done in the lower course of the Obra river (Western Poland).
The fragment of vertical profile, which consisted of various alluvial sediments (fine sands, peats, and sandy silts) was chosen
for detailed analysis. The main research problem was to determine if lithology and chemical constitution of alluvial deposits
are interconnected in a distinct way within studied section of the Obra river valley, and, if changes of chemical elements’
concentration could be used to illustrate depositional processes, which take place in riverbed and floodplain. Concentrations
of Fe, Mn, Cu, Zn, Ca, Mg, and K were determined in collected sediment samples. Next, geochemical groups of alluvial sediments
were distinguished using cluster analysis. Investigated changes of chemical elements’ concentration show that there is a distinct
border between the environment of organic sediments, which marks the place of former functioning of the Obra riverbed, and
sandy silts, which were deposited within floodplain during floods. Besides, floodplain sediments, riverbed sediments, and
reductive environment within peat deposits were singled out on the basis of the analysis. 相似文献
5.
Dinh Chau Nguyen Phon Le Khanh Paweł Jodłowski Jadwiga Pieczonka Adam Piestrzyński Hao Duong Van Jakub Nowak 《Acta Geophysica》2016,64(6):2305-2321
The field radiometric and laboratory measurements were performed at the Sin Quyen copper deposit in North Vietnam. The field gamma-ray spectrometry indicated the concentration of uranium ranging from 5.5 to 87 ppm, thorium from 5.6 to 33.2 ppm, and potassium from 0.3 to 4.7%. The measured dose rates ranged from 115 to 582 nGy/h, the highest doses being at the copper ore. Concentrations in the solid samples were in the range of 20–1700 Bq/kg for uranium, 20–92.7 Bq/kg for thorium, and 7–1345 Bq/kg for potassium. The calculated doses were from 22 to 896 nGy/h; both measured and calculated dose rates are mostly related to uranium. Concentrations of radium in water samples were below 0.17 Bq/L. Uranium in water samples was significantly higher than the hydrogeological background; the maximum of 13 Bq/L was at the waste zone pool, but neither radium nor uranium were present in tap water. Radon concentration in the dwelling air was from 42 to 278 Bq/m3 for 222Rn and from 8 to 193 Bq/m3 for 220Rn. The estimated committed dose rates were principally related to 222Rn concentration and ranged from 1.1 to 8.1 mSv/y. 相似文献
6.
Ćwiek Mateusz Matusiak-Małek Magdalena Puziewicz Jacek Ntaflos Theodoros 《International Journal of Earth Sciences》2018,107(5):1731-1753
International Journal of Earth Sciences - The Oligocene/Miocene basanite from Pilchowice (Sudetes Mts., SW Poland) carries numerous small xenoliths of mantle peridotite, mostly harzburgite. The... 相似文献
7.
8.
In this initial study, we propose a new distance function D
V
involving heliocentric vectorial orbital elements. The function measures differences between: the orbital energies, the angular
momentums vectors and the Laplace vectors. In comparison with the widely used D
SH
criterion of Southworth and Hawkins, D
D
criterion of Drummond and their hybrid D
H
by Jopek, the new function contains one invariant with respect to the principal secular perturbation: the orbital energy.
The new function proved to be useful in the classification amongst the IAU2003 meteoroids which we searched for streams by
D
V
function and also using D
SH
and D
N
-function given by Valsecchi et al. For major streams, the results agree very well. For minor, and near-ecliptical streams
the results sometimes differ markedly. 相似文献
9.
Michaël Hermoso Laurence Le Callonnec Fabrice Minoletti Maurice Renard Stephen P. Hesselbo 《Earth and Planetary Science Letters》2009,277(1-2):194-203
The causes of the pronounced negative excursion in carbon-isotope values that was recorded during the Early Toarcian Oceanic Anoxic Event (T-OAE) are still under debate, particularly with regard to the local versus global pattern of the excursion, and the extent to which recorded signals are under a diagenetic control. In this study we employ a novel microseparation technique in order to investigate the isotopic and mineralogical characteristics of different size fractions of the carbonate content from a Toarcian section recovered from the Sancerre–Couy borehole, southern Paris Basin. Beyond the recognition of a ? 6‰ δ13C excursion in the bulk carbonate content, our data also demonstrate that biogenic particles (such as coccoliths) and inorganic grains precipitated as early diagenetic phases (including dolomite) both record the excursion with the same magnitude. Although several black shales occur through the Paris Basin Toarcian section, it is only that associated with the onset of the OAE that coincides with a large negative carbon-isotope excursion. Taken together these observations indicate that during this event, the entire water column was characterized by homogeneous carbon-isotope values; such a pattern is incompatible with the idea that the negative excursion was generated simply through the upwelling of bottom waters enriched in re-mineralized organic carbon (cf. “the Küspert model”), since this would have required a strong vertical gradient in the water column. Additionally, the Paris Basin data show that the decrease in carbonate δ13C values during the OAE occurred in several discrete steps (each of some ? 2‰), as has previously been found for organic carbon substrates in other European sections. The stepped nature of the isotopic profile, which is part of a stratigraphic signature previously ascribed to Milankovitch forcing, is compatible with regular pulsed input of light carbon into the whole atmosphere–ocean system from a climatically sensitive source such as gas hydrate, or from thermal methanogenesis of organic-rich sediments in the Karoo–Ferrar large igneous province. Contrasts in the amplitude of the negative carbon-isotope excursion on a regional scale remain an important unexplained aspect of the Toarcian record. 相似文献
10.
The paper summarises the history of human settlement in the Sudetes from the Bronze Age. A more intensive stage was reached
in the Middle Ages when settlers from the west established new villages deep in the mountain valleys. By the beginning of
the 20th century the Sudetes were already overpopulated but after a near-complete ethnic replacement from a German to a Polish
population in 1945–8, population continued to grow until the 1980s. However, the economic system was hardly sustainable by
this time. There were many polluting industries in the region and massive transboundary pollution from adjacent areas of Czechoslovakia
and Germany had a devastating effect on the forests. Moreover, subsidised state agriculture placed heavy pressure on vulnerable
mountain grazings. Since 1989 there has been a process of deindustrialisation in the Sudetes and surrounding areas and, with
the disappearance of the state farms and the reduction in subsidies, agriculture is now better adjusted to the natural potential
and is complemented by a promising start with agrotourism. The population of the region is growing relatively slowly (0.8%
per annum 1956–1999), with the rural areas now in decline. A sustainable future for the region is now a possibility, but while
there is a consensus for continued environmental reconstruction, supported by alternative economies, this will have to be
carefully managed in the years ahead when EU accession may bring heavier development pressures than those evident at the moment.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献