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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. Source


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. Source


Kovar P.,Czech University of Life Sciences | Hermanovska D.,Czech University of Life Sciences | Hadas P.,University of Central Europe in Skalica | Hrabalikova M.,Czech University of Life Sciences | Peskova J.,Czech University of Life Sciences
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 Hodonín to Lanžhot. 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 Lanžhot. 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. © 2016, Springer International Publishing Switzerland. Source


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. Source


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. Source

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