The State School of Higher Education in Chelm

www.pwsz.chelm.pl
Chelm Slaski, Poland
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Gontarz A.,Lublin University of Technology | Pater Z.,Lublin University of Technology | Tofil A.,The State School of Higher Education in Chelm
Journal of Shanghai Jiaotong University (Science) | Year: 2011

This paper presents theoretical analysis of unconventional forging process of hollowed shaft from Ti-6Al-4V alloy in a three-slide forging press. This method in comparison with other metal forming methods allows for obtaining of hollowed products. The designed process is verified theoretically by means of numerical simulations based on finite element method with assumption of 3D state of strain. The following factors are considered in the analysis: material flow kinematics, strain distribution, temperature distribution and force of process. On the basis of results, it is stated that the application of designed technology allows for obtaining of a product of assumed quality. A comparison is made between material consumption in analyzed process and material consumption in typical metal forming methods, also in used at present technology of shaft manufacturing by machining only. It is stated that the application of forging in the three-slide forging press allows for a considerable decrease of manufacturing costs due to material savings and decrease of labor consumption of operations at finishing. © 2011 Shanghai Jiaotong University and Springer-Verlag Berlin Heidelberg.


Kornillowicz-Kowalska T.,Lublin University of Life Sciences | Kitowski I.,The State School of Higher Education in Chelm
Saudi Journal of Biological Sciences | Year: 2016

Birds' nests may be refuges for various species of fungi including that which are potentially phytopathogenic and zoopathogenic. Among the 2449 isolates of fungi obtained from nests of Marsh harriers 96.8% belonged to filamentous fungi. In total, 37 genera were identified from 63 fungi species. Within the mycobiotas of the examined nests populations of fungi which are potentially pathogenic for humans, homoiothermous animals and plants dominated. Among 63 species, 46 (72%) were potentially pathogenic fungi of which 18 species were potentially phytopathogenic and 32 species were pathogenic for homoiothermous animals. Inter alia species of fungi were found in the Marsh harriers nests: Aspergillus fumigatus, Aspergillus flavus, Scopulariopsis brevicaulis, Chrysosporium keratinophilum and Fusarium poae, Fusarium sporotrichioides. In terms of numbers, dominant in Marsh harrier nests were fungi pathogenic to birds, other homoiothermous animals and humans. On that basis it was concluded that Marsh harrier nests are both a source of fungal infections for that species and one of the links in the epidemiological cycle of opportunistic fungi for humans. © 2017.


Jozwik J.,Lublin University of Technology | Kuric I.,University of Zilina | Saga M.,University of Zilina | Lonkwic P.,The State School of Higher Education in Chelm
Manufacturing Technology | Year: 2014

The paper analyses the influence of the feed motion speed vf on the value of measured geometric errors of the fouraxis vertical machining centre CNC FV-580A with the FANUC 0IMB numerical control system. The tests were conducted with LSP 30 Compact laser interferometer (by Lasertex). Examples of modern, laser diagnostic systems of numerically controlled CNC machine tools were characterised in the article. Self-tracking laser interferometer LaserTRACER, diagnostic appliance LaserTRACER-MT, laser interferometer with XL80 with environmental parameters' measuring module XC80 and with heat sensors along with XR20-W calibrator were presented. Measurement results and their analysis were presented graphically in the form of diagrams and tables. The conclusion section comprises the discussion of the results, summary and deduction. © 2014. Published by Manufacturing Technology.


Swic A.,Lublin University of Technology | Mazurek L.,The State School of Higher Education in Chelm
Eksploatacja i Niezawodnosc | Year: 2011

The paper introduces a mathematical model of operation of a flexible synchronous production line (FSPL) of multifunctional CNC machines that includes one redundant multifunctional CNC machine which can take over the functions of every FSPL machine. The graph of FSPL state, relations and equations used to calculate reliability and productivity are shown. Maple, the software used for reliability and productivity calculations and modelling, as well as the mathematical results are presented.


Kornillowicz-Kowalska T.,Lublin University of Life Sciences | Kitowski I.,The State School of Higher Education in Chelm
Mycopathologia | Year: 2013

A study was performed on the numbers and species diversity of thermophilic fungi (growing at 45 °C in vitro) in 38 nests of 9 species of wetland birds, taking into account the physicochemical properties of the nests and the bird species. It was found that in nests with the maximum weight (nests of Mute Swan), the number and diversity of thermophilic fungi were significantly greater than in other nests, with lower weight. The diversity of the thermophilic biota was positively correlated with the individual mass of bird and with the level of phosphorus in the nests. The dominant species within the mycobiota under study was Aspergillus fumigatus which inhabited 95 % of the nests under study, with average frequency of ca. 650 cfu g-1 of dry mass of the nest material. In a majority of the nests studied (nests of 7 bird species), the share of A. fumigatus exceeded 50 % of the total fungi growing at 45 °C. Significantly higher frequencies of the fungal species were characteristic of the nests of small and medium-sized piscivorous species, compared with the other bird species. The number of A. fumigatus increased with increase in the moisture level of the nests, whereas the frequency of occurrence of that opportunistic pathogen, opposite to the general frequency of thermophilic mycobiota, was negatively correlated with the level of phosphorus in the nest material, and with the body mass and length of the birds. The authors indicate the causes of varied growth of thermophilic fungi in nests of wetland birds and, in particular, present a discussion of the causes of accumulation of A. fumigatus, the related threats to the birds, and its role as a source of transmission in the epidemiological chain of aspergillosis. © 2012 Springer Science+Business Media B.V.


This study deals with the population size and the distribution of breeding colonies of the rook in rural parks in the eastern part of the Lublin region (Eastern Poland). Large parks with a large number of tree species were appropriate sites for larger rookeries. Small, degraded parks, with few species of trees, were used by smaller rookeries, which showed tendencies to disappear more quickly. Small colonies were irrevocably abandoned if disturbed by man, whereas large ones had a very high reoccupation potential, even after a few years. Unfortunately, ownership changes concerning rural parks in Eastern Poland may endanger the rookeries located there.


Czarnecka J.,Maria Curie Sklodowska University | Kitowski I.,The State School of Higher Education in Chelm
Folia Geobotanica | Year: 2013

Seed dispersal seems to be extremely important in agrocoenoses where suitable habitats (patches) are surrounded by an unfavourable environment (matrix). The role of the rook Corvus frugilegus, an omnivorous bird, in seed dispersal was studied in the agricultural landscape of Eastern Poland. We analyzed 739 pellets produced by regurgitation, which were collected under breeding colonies in April, May and June. Our goal was to i) assess the structure of the seed pool in pellets; ii) evaluate the temporal variation in the pellet seed pool on two different time scales; iii) compare the species composition of seeds in pellets and vegetation under the rook nests. Seeds were present in 18 % of pellets; 571 seeds were found, half of them belonging to dry-fruited species, without any obvious adaptations to endozoochory. These seeds could be an additional source of food, or they could have been accidentally swallowed during foraging for other food items. Taking into consideration the abundance of the rook population, we assessed the mean number of seeds transferred by one bird to be from 4 seeds per month in April and up to 160 seeds in June. The most important factor responsible for qualitative and quantitative structure of seed pool in pellets is the time when pellets were regurgitated. The type and availability of food determines the number and species structure of dispersed seeds. The comparison of the species structure of the seed pool in pellets and of the herb layer under the breeding colonies showed that the rook could effectively disperse seeds of weeds, meadow and ruderal species, that could germinate under the dense canopy of trees at the studied sites. © 2012 The Author(s).


Piasta W.,Kielce University of Technology | Gora J.,Lublin University of Technology | Turkiewicz T.,The State School of Higher Education in Chelm
Construction and Building Materials | Year: 2016

Direct tests allowed determining properties of coarse igneous rock aggregates in comparison with gravel along with freeze-thaw resistance and susceptibility to alkali-aggregate reaction. The relationship between the properties and durability of the aggregates and concretes was evaluated taking into account the results from microstructural analyses. Granodiorite, basalt and gravel were sensitive to alkali-silica reaction due to the presence of strained quartz, chalcedony and opal, respectively. The resistance of the aggregate to freezing and thawing was demonstrated to agree with the values of crushing resistance and the lowest contents of pores with diameters unsafe in terms of the freeze-thaw resistance. © 2016 Elsevier Ltd


Kitowski I.,The State School of Higher Education in Chelm
Turkish Journal of Zoology | Year: 2014

Birds, including kestrels, constitute a serious impediment to air traffic and are considered pests when they disrupt aviation operations. This study investigated the behaviour of kestrels at Deblin Military Airfield (eastern Poland) in response to bird strike risk management by means of falconry. Trained raptors changed the behaviour of kestrels. During the period when trained raptors worked at the airfield, kestrels were less often found there compared to the control period. During falconry sessions, kestrels perched less often compared to the control period. Kestrels also hovered less during falconry sessions compared to the control period. Falconry reduced the risk of bird strikes at the airfield and also changed the composition of kestrels' diets. © TÜBİTAK.


Kitowski I.,The State School of Higher Education in Chelm
North-Western Journal of Zoology | Year: 2013

Prey use is compared between barn owl and long-eared owl from pellets sampled at six sites in eastern Poland. Mammals made up 97.3% of long-eared owl diet by biomass. The most important species were voles Microtus spp. and mice Apodemus spp., constituting 79.9% and 13.0% by biomass, respectively. Their average prey weight was 19.9 g. Mammals made up 99.6% of barn owl diet by number and 99.2% by biomass. The most important were voles Microtus spp. and mice Apodemus spp., constituting 79.9% and 13.0% by biomass, respectively. Average prey weight was 12.3g. A significant difference was found in the mean weight of prey taken by the two owl species. barn owls took less avian prey compared to long-eared owls. Birds caught by long-eared owls were also heavier than those caught by barn owls, though the difference was not significant. The median weight of bird prey for barn owls and long-eared owls was 23 g and 32 g, respectively. The similarity of diet of the wintering owls in particular sites was in the range: 9.0%-98.4%. The total prey overlap of the two wintering species was 83.2%. © NwjZ, Oradea, Romania, 2013.

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