Wyniki wyszukiwania - BazTech

1

Determination of the probability factor of particles movement in a gas-dispersed turbulent flow

Adikanova Saltanat, Wójcik Waldemar, Denissova Natalya, Malgazhdarov Yerzhan, Kadyrova Ainagul

Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska

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2019

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T. 9, nr 2

32--35

EN

The goal of the work is to define the probability factor of particles movement in a gas-dispersed turbulent flow. The object of the research is the description of harmful impurities transfer process in the atmosphere with the help of mathematical modelling of variability of gas and aerosol composition of atmosphere. Another object is assessment atmospheric impurities on the environment. The novelty of the research is that probabilitystatistical approach is used in modelling the transfer of harmful impurities from anthropogenic sources into the atmosphere.

PL

Celem pracy jest określenie współczynnika prawdopodobieństwa ruchu cząstek w przepływie turbulentnym dyspersyjnym w gazie. Celem pracy jest opisanie procesu przenoszenia szkodliwych zanieczyszczeń do atmosfery za pomocą matematycznego modelowania zmienności składu gazów i aerozoli atmosferycznych oraz ocena wpływu zanieczyszczeń atmosferycznych na środowisko. Nowością tych badań jest zastosowanie probabilistycznego i statystycznego podejścia do modelowania transferu szkodliwych zanieczyszczeń ze źródeł antropogenicznych do atmosfery.

2

Brown Bear Winter Feeding Ecology in the Area with Supplementary Feeding — Eastern Carpathians (Slovakia)

Štofík J., Merganič J., Merganičová K., Bučko J., Saniga M.

Polish Journal of Ecology

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2016

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Vol. 64, nr 2

277--288

EN

We performed snow tracking of brown bear (Ursus arctos) in the area of the Eastern Carpathians affected by supplementary feeding during the winter periods from 2007 to 2013. On each snow track we recorded all food habits and collected all scats. From these data we calculated occurrence frequency of food habits on snow tracks, occurrence frequency, volumetric proportion and energy values of food items in scats. We revealed that: i) the most frequent food source on snow tracks was corn from supplementary feeding places for ungulates (FOST = 64%); ii) crops for ungulates was the most important food group found in scat samples of bears (EDEC = 61%, EDECST = 53%); iii) the analysis of the inter-seasonal (late autumn, winter and early spring) changes in winter bear diet based on scat analyses revealed decreasing importance of hard mast and fruit, and increasing importance of invertebrates, herbs and wood biomass and crops for ungulates from autumn to spring; iv) bears searched for food at lower elevations in comparison to the location of their beds which are situated at higher elevations. Winter bear activity and bear diet was affected by supplementary feeding for ungulates.

3

Impact of heavy metals on water, fish (Cyprinus carpio) and sediments from a water tank at Tumkur, India

Nayaka B.M.S., Ramakrishna S., Jayaprakash D.M.R.

Oceanological and Hydrobiological Studies

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2009

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Vol. 38, No.2

17-28

EN

This study was carried out to assess the concentrations of various heavy metals and their distribution in a hyper-eutrophic urban Tumkur tank system, which is being polluted from industrial, domestic and sewage effluents. Samples of water, fish and soil sediment were analyzed for the concentration of seven heavy metals (iron, zinc, copper, nickel, chromium, lead and cadmium) using atomic absorption spectrophotometry. The water-soluble (bioavailable) fractions of heavy metals correlated positively with their total concentration, exhibiting the following sequence of bioavailability: Zn > Cd > Ni > Pb > Cu > Cr > Fe. Cyprinus carpio exhibited a maximum bioaccumulation factor for copper (5500). The mean values of all types of collected samples were correlated with the corresponding mean values in a control tank (Teetha tank). The sequence of the order of the concentration of the metals in water, fish and sediment samples exhibiting higher values than those observed in the control tank was as follows: Cr > Pb > Cu = Ni > Fe > Cd > Zn, Cr > Cd > Cu = Zn > Pb > Fe = Ni and Fe > Pb > Cr > Cu > Ni > Zn > Cd, respectively. The geoaccumulation indices of the heavy metals revealed that the tank is moderately to strongly contaminated. As Cyprinus carpio is extensively used for human consumption, there is a growing health risk that these metals could find their way into the human food chain.

4

Stable isotope composition of carbon dioxide emitted from anthropogenic sources in the Kraków region, Southern Poland

Zimnoch M.

Nukleonika

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2009

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Vol. 54, No. 4

291-295

EN

The summary of the measurements of CO2 stable isotopic composition emitted from different anthropogenic sources in the Krakow region is presented. The sources are divided into three main groups . high emission (electric and heat power plants), low emission (coal and methane burning in the households) and car traffic (gasoline, diesel and LPG supplied engines equipped and not equipped with catalyst). Presented results include two measurement campaigns made in the years 1995 and 2000. The measurements revealed three well-defined groups with respect to carbon isotope composition (delta13CVPDB): .30.60 plus-minus sign 0.37 per mille (thousand) sign (car traffic) .23.82 plus-minus sign 0.10 per mille (thousand) sign (coal burning) and .51.8 plus-minus sign 1.1per mille (thousand) sign (methane burning). The oxygen isotope composition (delta18OVPDB-CO2) of CO2 varied in a broad range, from ca. .11per mille (thousand) sign to ca. .22 per mille (thousand) sign, the most negative values being observed for coal and methane burning and the most positive for cars equipped with a catalyst. No significant isotopic shift has been observed between two measurement campaigns.