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Brno, Czech Republic

Hanak T.,BrnoUniversity of Technology | Muchova P.,BrnoUniversity of Technology
Procedia Computer Science

Efficient use of public resources should be supported by quality management of the tender procedure to achieve competitive tender prices. This paper examines the issue of competitive environment within public works contracts and explores the influence of the number of bidders on the tender results. A research sample of 256 public tenders was investigated in order to evaluate two research hypotheses. Data evaluation was supported by interval plot, scatter plot and correlation analysis. It has been found that the number of bidders in the tender depends on the type of the subject matter of the tender; however, this difference does not have a significant impact on the level of competition. Another research finding supports the assumption that the number of bidders influences the relative difference between expected price and award price. It was concluded that contracting authorities must not only require a sufficient range of qualifications, but should also take any steps required to motivate a sufficient number of applicants to participate in the tender procedure to achieve competitive prices. © 2015 The Authors. Published by Elsevier B.V. Source

Fedorkova A.,University of P.J. Safarik | Fedorkova A.,BrnoUniversity of Technology | Orinakova R.,University of P.J. Safarik | Cech O.,BrnoUniversity of Technology | Sedlarikova M.,BrnoUniversity of Technology
International Journal of Electrochemical Science

This paper reviews the state-of-art of composite cathode materials for the applications in lithium/sulfur (Li/S) batteries. An attempt is made to highlight those key issues in previous work that have stimulated further research toward practical application of Li/S batteries. Detailed information on the advanced developments on carbon and polymer composite cathodes are presented. Their implementation holds the greatest promise in a number of applications ranging from portable electronics to electric vehicles. Fundamental scientific advances in understanding the reactions occurring in the cells as well as new materials are key to overcoming all the drawbacks related to Li/S batteries. In this review article we focus on some of the recent achievements in boosting the cyclability, power density and performance of Li/S batteries through the development of new cathode composite materials. © 2013 by ESG. Source

cerna M.,BrnoUniversity of Technology | Vesely M.,BrnoUniversity of Technology | Dzik P.,BrnoUniversity of Technology | Guillard C.,CNRS Research on Catalysis and Environment in Lyon | And 2 more authors.
Applied Catalysis B: Environmental

Titanium dioxide (TiO2) colloidal dispersions were synthesized by hydrothermal synthesis in acidic pH under various process conditions. Phase structure of prepared TiO2 was identified as pure rutile by X-ray diffraction analysis and crystallite sizes determined by the Scherrer equation were in the range of 10-25nm. These values correlated with particle sizes observed by transmission electron microscopy (TEM). Afterwards, the prepared TiO2 dispersions were used for the formulation of stable inkjet printable " inks" Thin layers of nanocrystalline TiO2 were deposited by inkjet printing onto soda-lime glass substrates. After sintering at 500°C, thin patterned films were obtained. Their basic physicochemical properties were characterized by standard methods. Optical microscopy and SEM imaging revealed highly structured topography of samples surface. Layer hardness was equivalent to the B pencil as determined by the " Pencil Hardness Test" The topology and roughness were examined by atomic force microscopy and RMS roughness was in the range of 40-100nm. Band gap energy of TiO2 determined by UV-vis reflection spectroscopy was consistent with known rutile values. The photocatalytic activity of printed layers was evaluated on the basis of 2,6-dichloroindophenoldiscoloration rate monitored by UV-vis spectroscopy and did not exceed the performanceof Aeroxide P-25. Despite average photocatalytic performace of this particular TiO2 type, inkjet printing proved to be an efficient method for the fabrication of patterned titania films originating from nanocrystalline precursor. © 2013 Elsevier B.V.. Source

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