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Lavrov E.,Sumy State University | Kupenko O.,Sumy State University | Lavryk T.,Sumy State University | Barchenko N.,Sumy National Agrarian University
Informatics in Education | Year: 2013

With a significant increase in the number of e-learning resources the issue of quality is of current importance. An analysis of existing scientific and methodological literature shows the variety of approaches, methods and tools to evaluate e-learning materials. This paper proposes an approach based on the procedure for estimating parameters of local factors and receiving the integral index of usability quality of e-learning modules. We present a mathematical model which serves as a basis for the automated procedures for expertise. The use of fuzzy logic allows to reduce greatly the complexity of evaluating the formation of a repository of e-learning modules. The proposed approach is focused on the situation, when the university - has amassed a large number of e-learning modules that have to be assessed in terms of ergonomics; - is able to use experts in ergonomics and organization of e-learning (the experts can provide, as a rule, qualitative assessment); - is limited in resources on the development of special software for evaluation of e-learning modules; - is forced by the need to reduce the cost of expertise to be limited to considering only the main quality indicators that have the greatest impact on the ergonomics of e-learning modules. For automation of the ergonomic examination procedures a MatLab system is used, in particular Fuzzy Logic Toolbox. Application of the well-known mathematical tools and widely used means of processing expert qualitative assessments can significantly reduce the cost of the expertise. © 2013 Vilnius University. Source


Surai P.F.,Feed Food Ltd | Surai P.F.,Szent Istvan University | Surai P.F.,Trakia University | Surai P.F.,Sumy National Agrarian University | And 2 more authors.
Animal Feed Science and Technology | Year: 2014

Selenium (Se) is shown to be an essential element for poultry nutrition and a great deal of information has been accumulated for the last 20 years indicating that dietary form of Se is a major determinant of its efficiency. Generally speaking, there are two major Se sources for poultry, namely inorganic selenium (mainly selenite or selenate) and organic selenium in the form of selenomethionine (SeMet; mainly as Se-Yeast or SeMet preparations). In this review two main areas are considered in relation to the Se nutrition of breeders. Firstly, it is Se important roles in the maintenance of semen quality and optimal Se status of poultry males and Se is considered to be an important factor in ensuring the fertility of breeding stock. Secondly, Se status of the eggs from breeding birds is of great importance for the maintenance of the antioxidant system of the developing embryo. It is generally accepted that the hatching process is an oxidative stress and improvement in antioxidant defences of the embryo can increase hatchability. It is quite clear that the roles of Se in poultry nutrition and reproduction need new consideration in light of our recent knowledge on the molecular mechanisms of Se action at the cellular and sub-cellular levels. In particular, the discovery and characterisation of a range of new selenoproteins and a better understanding of the relationships between different antioxidants, as important parts of integrated antioxidant system with possibilities for antioxidant recycling in vivo, have yielded new insights in this area. In particular, it should be mentioned that increased levels of Se supplementation are not always beneficial, since selenoprotein synthesis is under the gene control and it reflects the need in these active molecules to deal with various stresses. However, to give a body a chance to affectively respond to environmental challenges by modulating selenoprotein synthesis there should be enough Se reserves available and this an ability of building Se reserves in the body is considered to be the main point in advantages of organic selenium in poultry and farm animal nutrition. A comprehensive analysis of the effects of various forms of dietary Se on its egg concentration, its transfer to the embryonic tissues and physiological consequences of the improved Se status of the progeny chicks are considered. © 2014 Elsevier B.V. Source


Beresnev V.M.,Ukrainian Academy of Sciences | Sobol' O.V.,University of Kharkiv | Pogrebnjak A.D.,Sumy Institute For Surface Modification | Turbin P.V.,Sumy National Agrarian University | Litovchenko S.V.,University of Kharkiv
Technical Physics | Year: 2010

The results of studying the effect of high-tempera ture annealing in vacuum and in air on the phase composition, structure, and stressed state of ion-plasma condensates in the Zr-Ti-Si-N system are reported. In going from air annealing to vacuum annealing, the amount of active oxygen atoms decreases and the phase composition of the condensate remains stable to 1000°C or higher. A change in the crystal phase composition shows up, for the first place, in the crystallization of silicon nitride with the intense formation of hexagonal β-Si3N4 crystallites and also in the feeble formation of ZrO2 dioxide. The latter process does not lead to the decomposition of the (Zr, Ti)N solid solution: it merely increases the partial concentration of the titanium component. © 2010 Pleiades Publishing, Ltd. Source


Surai P.F.,Feed Food Ltd | Surai P.F.,Scottish Agricultural College | Surai P.F.,Sumy National Agrarian University
World's Poultry Science Journal | Year: 2012

Among more than 750 known carotenoids, canthaxanthin (CX) has a special place as a carotenoid with proven antioxidant and other biologically-relevant functions. A great body of evidence indicates that CX possesses high antioxidant activity that was shown in various in vitro model systems as well as in animal experiments in vivo. Antioxidant defences of chicken eggs are based mainly on vitamin E and carotenoids and their concentrations in the egg yolk is dependent on their dietary provision. ηX is well absorbed from the feed and effectively transferred to the egg yolk and further to the developing embryo. Increased CX concentration in embryonic tissues is associated with increased resistance to oxidative stress. Since oxidative stress is an important element of increased embryonic mortality during the last week of incubation it is highly likely that dietary CX could support chicken viability after hatch. In well designed experiments, it was proven that CX dietary supplementation of the breeder's diet significantly increased anti-oxidative status in the egg yolk and newly hatched chicks and as a result hatching rate of chicken eggs was significantly increased. Taken together, the aforementioned results clearly indicate that CX provides a great deal of benefits for chicken eggs, embryos and chickens during early postnatal development. © 2012 World's Poultry Science Association. Source


Surai P.F.,Feed Food Ltd | Surai P.F.,Scottish Agricultural College | Surai P.F.,Sumy National Agrarian University
World's Poultry Science Journal | Year: 2012

Among more than 750 known carotenoids, canthaxanthin (CX) has a special place as a carotenoid with proven antioxidant and other biologically-relevant functions. A substantial body of evidence indicates that CX possesses high antioxidant activity which has been shown in various in vitro model systems as well as in animal experiments in vivo. It seems likely that the highest protective effects of CX are seen under various stress conditions. This compound may be considered as an important element of the integrated antioxidant system of various tissues in the body, including chicken embryo development. A possibility of the recycling of vitamin E by carotenoids, including CX, is of interest for further investigation. Taken together, the data analysed in the paper clearly indicated that CX could provide benefits for animals, including in eggs and embryos as well as for chickens during early postnatal development. In particular, CX is well absorbed from the diet and effectively transferred to the egg yolk and developing embryo. It possesses high antioxidant activity and participates in building an effective antioxidant system of the body. Copyright © 2012 World's Poultry Science Association. Source

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