Nagode A.,University of Ljubljana |
Klancnik G.,University of Ljubljana |
Schwarczova H.,University of Central Europe in Skalica |
Kosec B.,University of Ljubljana |
And 2 more authors.
Engineering Failure Analysis | Year: 2012
Brown stains were observed forming after the black-oxide coating on the surfaces of grey-cast-iron hot plates made for an electric stove. These stains were metallographically examined using a scanning electron microscope (SEM) equipped with an energy-dispersive X-ray spectrometer (EDXS). For the phase identification we also employed X-ray diffraction (XRD) analyses. The results indicated that the stained surfaces of the hot plates were covered with whiskers of hematite (Fe 2O 3), while on the surfaces of the non-defective hot plates only magnetite (Fe 3O 4) was present. The thermodynamic calculations confirmed the possibility of the formation of hematite (Fe 2O 3) as a result of the oxidation of magnetite (Fe 3O 4) if the partial pressure of oxygen is increased during the black-oxide-coating process. © 2012 Elsevier Ltd.
Bodova E.,University of Central Europe in Skalica |
Soltesova K.,Slovak Innovation and Energy Agency
Production Management and Engineering Sciences - Scientific Publication of the International Conference on Engineering Science and Production Management, ESPM 2015 | Year: 2016
Within II. climate—energy package in relation to the EU 2020 strategy was approved by the new directive 2012/27/EU on energy efficiency, which priority objective is to regulate the legal framework for energy efficiency in order to achieve the objective of energy efficiency 2020 of 20% primary energy savings. One of measures is to achieve this; it is also an obligation on businesses of EU member states to carry out periodically an energy audit. The Slovakia has transposed the directive in question by NR SR Nr.321/2014 Coll. on energy efficiency, which is addressed in section 14 requirements regarding performance of an energy audit in the Slovakia and the possibility of carrying out an energy audit as part of an established and certified system of Energy Management (EnMS) according to international standard ISO 50001: 2012 and Environmental Management System (EMS) according to international standard ISO 14001: 2004. © 2016 Taylor & Francis Group, London.
Kubisz D.,Polish Academy of Sciences |
Kajtoch L.,Polish Academy of Sciences |
Mazur M.A.,University of Opole |
Lis A.,Polish Academy of Sciences |
And 2 more authors.
Invertebrate Biology | Year: 2012
Xerothermic species are rare and threatened in central and eastern Europe. In light of the continuing loss of steppe-like habitats due to anthropogenic fragmentation and degradation, the evaluation of genetic variation in populations inhabiting them is of immediate importance if appropriate conservation measures are to be undertaken. Here we report on the genetic diversity of the rare leaf beetle Crioceris quatuordecimpunctata, whose populations in central and eastern Europe inhabit highly geographically isolated areas. All of the studied populations (in Poland, Ukraine, and Slovakia) were differentiated at the mitochondrial marker COI. However, with respect to the nuclear marker ITS1, Polish populations were monomorphic, but distinct from all other populations. The distinctiveness of the studied populations was confirmed by Wolbachia screening, which showed that all populations carried different strains (one or two), which were probably transferred independently from other insects. On the other hand, no diversity was found in any marker within particular populations, which could be caused (at least for mtDNA) by a Wolbachia selective sweep. Crioceris quatuordecimpunctata probably consists of isolated populations, which went through narrow bottlenecks leading to a drastic reduction in their genetic diversity. As these populations are reciprocally monophyletic for mtDNA haplotypes and show a significant divergence of allele frequencies at nuclear loci, they could be classified as evolutionarily significant units (ESUs). In addition, DNA barcodes were used to identify Asparagus officinalis as the host plant for members of all studied populations. These data should be valuable in efforts to conserve populations of C. quatuordecimpunctata (e.g., for guiding reintroductions). © 2012, The American Microscopical Society, Inc.
Martinka J.,Slovak University of Technology in Bratislava |
Kacikova D.,Technical University In Zvolen |
Hroncova E.,Technical University In Zvolen |
Ladomersky J.,University of Central Europe in Skalica
Journal of Thermal Analysis and Calorimetry | Year: 2012
The combustion process (efficiency and toxicity of combustion generated emissions) depends on the chemical composition and physical characteristics of materials, the oxidizing agents, and the temperature. This article will determine the influence of temperature (450 and 600 °C) and the volume of oxygen concentration (9, 15, and 21%) in an oxidizing atmosphere on the main emissions of burning White Birch wood (Betula verrucosa Ehrh.) The examined samples weighed 3 ± 0.05 g; the average density was 540 kg/m 3; and the absolute humidity was 8%. The samples were thermally loaded in a Setchkin furnace specially modified to enable the thermal sample in an atmosphere with an adjustable oxygen concentration and the withdrawal of fire emissions by means of UniGas C440 analyzer probes and BERNATH ATOMIC Modell 3006 analyzers. At 450 °C, the concentration of oxygen in the oxidation mixture did not significantly influence the maximum concentration of carbon monoxide (CO) and the total organic carbon (TOC) in the fire emissions. At 600 °C, the decrease of the oxygen concentration in the oxidation atmosphere caused a significant increase of the maximum concentration of CO and TOC in the fire emissions. However, the generally accepted presumption of a maximum concentration increase of CO in the emissions as a result of the oxygen (O 2) concentration decrease in the oxidation atmosphere has not been confirmed. The highest concentration of CO and TOC were measured in the initiation phase or closely after it. © 2012 Akadémiai Kiadó, Budapest, Hungary.
Kolarovic J.,Oncology Institute of Vojvodina |
Popovic M.,University of Novi Sad |
Zlinska J.,University of Central Europe in Skalica |
Trivic S.,University of Novi Sad |
Vojnovic M.,Health Center
Molecules | Year: 2010
We have examined the influence of diluted pure celery and parsley leaf and root juices and their combinations with doxorubicin on the antioxidant status [as measured by the content of reduced glutathione (GSH) and ferric reducing antioxidant power (FRAP)] in liver homogenate and hemolysate and on the contents of cytochrome P450 in liver homogenate. It was found that doxorubicin significantly decreased the content of reduced glutathione and the total antioxidative status (FRAP) in liver homogenate and hemolysate, while celery and parsley juices alone and in combination with doxorubicin had different actions. Doxorubicin and celery juice had no effect on content of cytochrome P450. However, in combination with doxorubicin, parsley root juice significant increased, and parsley leaves juice decreased the cytochrome P450 content (compared to doxorubicin treated animals). Only parsley root juice significantly increased the content of cytochrome P450. © 2010 by the authors.
Ivetic V.,University of Novi Sad |
Trivic S.,University of Novi Sad |
Pogancev M.K.,University of Novi Sad |
Popovic M.,University of Novi Sad |
Zlinska J.,University of Central Europe in Skalica
Molecules | Year: 2011
The purpose of this study was to investigate the effects of treatment with water, n-butanol and ether extracts of Hypercom perforatum L. on epileptogenesis in rabbits. Animals from the control group received solvent-ethanol, and the kindling model of epilepsy was used. Epileptic focus was induced in Chinchilla rabbits by stimulation of the hippocampus. The following parameters were determined: the minimum current strength necessary to induce after-discharge (AD)-discharges appearing after cessation of stimulation; AD duration; the number of stimulations necessary to induce spontaneous kindling; and the latency time for the development of full kindling. The results obtained indicate that epileptogenesis is influenced by Hypericum perforatum L. extract treatment. Animals treated with an ether extract of Hypericum perforatum L. required significantly weaker minimum current strengths for the development of epileptogenic focus, and displayed longer AD times, while the number of electro-stimulations necessary for full kindling was less. In contrast, animals treated with water and n-butanol extracts required increased electro-stimulations for the development of epileptic discharge, and displayed shortened AD durations versus controls. © 2011 by The Authors.
Vilcek J.,University of Prešov |
Torma S.,Soil Science and Conservation Research Institute |
Adamisin P.,University of Prešov |
Hronec O.,University of Central Europe in Skalica
Bulgarian Journal of Agricultural Science | Year: 2013
The dynamics of nitrate and ammoniac nitrogen in soil after the application of zeolite of various amounts was monitored. The decreased ammonium content was apparent one month after zeolite application compared to the variants without zeolite due to the specific fixation of NH4 + cations on the zeolite lattice (92.5 mg at the control variant and 77.2 - 81.0 mg per kg of soil at the tested variants). Three months later, an ammonium content increase of 24-59 % at the variants with zeolite was observed in comparison with the control variant due to the gradual ammonium release from the zeolite lattice. Six months after zeolite application into the soil, statistically significant differences were found not only between the control variant and variants with zeolite, but also among individual variants with various zeolite dose (H=14.201; p=0.003 according to the Kruskall-Wallis test). The nitrification process in the soil is less intense due to the influence of applied zeolite. In the autumn period, the nitrate nitrogen content in the soil decreases by 66-78 % compared to the control variant, therefore, the nitrate leaching from the soil horizons to the ground water is less. In summary, zeolite can be considered as a slow releasing nitrogen fertilizer.
Majernik M.,University of Central Europe in Skalica |
Jurikova J.P.,University of Central Europe in Skalica
Komunikacie | Year: 2011
The authors are submitting a system model for integrated risk management. Results and conclusions of the paper are based on analysis of development, current status and progressive trends in standardization and risk management aspects of quality, safety, environment etc. Originality of the solution lies "in an enclosure" of quality management systems, safety management system and environmental management system according to standards, under the ISO standard ISO 31000 in the Slovak version of the upcoming STN. Solution is based on the philosophy of a single audit of compliance for the accreditation of certification bodies - they will certify risk management system. First audit can be realized for the certification system and the second for implementation system. The prepared standard ISO 31000 would be certification's standard.
Vilcek J.,University of Prešov |
Hronec O.,University of Central Europe in Skalica |
Tomas J.,Slovak University of Agriculture
Polish Journal of Environmental Studies | Year: 2012
Areal or pointed extension of soil contamination by risk elements was determined in samples from 47 locatoins of agricultural soils in "pollution-loaded" regions of eastern Slovakia during 2006 and 2008. These regions were primarily the areas of middle Spiš and northern Gemer, where soils were under long-term contamination by solid polluting elements containing risk elements. A source of contamination was metallurgical plants located in the broken terrain with unfavorable dispersion conditions. Risk elements Cd, Pb, Cu, Zn, Ni, Cr, and As were determined in the lixivium of Aqua regia and their accessible (mobile) forms in the lixivium of 1 mol·dm -3 NH 4HNO 3. To consider the solubility of the risk elements the lixivium of 0.05 mol·dm -3 EDTA (mobile and mobilizable forms) and the lixivium of 2 mol·dm -3 HNO 3 (potentially releasable contents) was used. Ascertained contents of the risk elements in the lixivium of Aqua regia correspond with the results regarding risk elements that were obtained by reduction in the mixture of inorganic acids before 1990. Then values of the solid polluting elements containing risk elements were the highest. The results confirm the large areal character of soil contamination by Hg and As in the emission areals of metallurgical plants where the natural endegeneous geochemical abnormalities now exist. Extremely high values of Pb, Zn, and Cd in close proximity to the former shaft-furnace (without any possibility of dispersion) are the result of solid polluting elements from Pb, Sn, alloys and ZnSO 4 production facilities. A considerably larger area of contaminated soils by Cu is connected to refined flame furnace copper production and convertors and its dispersion into the wider areas. Some isolated locations with Cd, Cu, Ni, Hg, and As excesses are connected to geological- petrographical conditions where polymetallic mineralizing of old environmental loads is characteristic. In the samples with high contents of risk elements in Aqua regia, there were also over limit values for accessible plant risk elements. In the sum of mobile and mobilizable forms with relatively the highest content of Cd (36.57%) and the lowest Cr (0.36%) were determined in the following decreasing order Cd > Pb > Cu > Ni > Zn > Cr. The relevant prevalence of risk elements in residual fractions is apparently connected to their emission origin from thermic processes as predominantly insoluble risk element oxids.
PubMed | Czech University of Life Sciences and University of Central Europe in Skalica
Type: Journal Article | Journal: Environmental monitoring and assessment | Year: 2016
The study area of the Morava River floodplain is situated between the rivers Morava and Kyjovka in the reach from Hodonn to Lanhot. This experimental area was chosen because during the last 30 years, there has been a serious problem with the frequent occurrence of hydrological extremes, such as floods and droughts. Dry seasons have a very negative impact on the floodplain forest and have been caused mainly by regulation of the Morava River channel in the 1970s. Since flooding in the catastrophic year 1977, a part of this area has served as a polder for flood impact mitigation of the urbanised area of the town of Lanhot. Management and farming practices have been heavily affected by the enormous economic and ecological damage due to long-term flooding of agricultural land. The purpose of this study is to assess the extent to which the precipitation in the growing season of the dry years 2003 and 2011 was deficient, in comparison with the normal year 2009, through a study of the actual evapotranspiration caused by the significant drought in the Morava floodplain. A similar but converse situation in the wet year 2010 was also analysed, with the aim to show the differences in the components of the water balance equation in the growing seasons of all the extreme years tested here. The daily data from the Kostice climatological station were processed using the WBCM-7 model, where the input parameters were calibrated by the fluctuation of the groundwater table in the control borehole.