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  • 1
    Language: Czech
    Description: This thesis presents a comprehensive view on the issue of illegal storage of hazardous substances and waste in the Czech Republic. The work is highly relevant, by the fact that illegal warehouses, or buildings where there is unlawful storage, the Czech Republic can find countless and their discovery is only a matter of time. In the theoretical part of the thesis deals with the legal definition of waste management, the topic of chemical substances and mixtures and their development at international and national level, so as to issues concerning these areas seen over the years. We describe the specific laws that serve as the theoretical basis for understanding the definition of waste and themes chemicals or mixtures. Another part is a statistical look at the amount of waste produced in the Czech Republic, the Czech Republic 's production with other countries of the European Union and the historical perspective. Results section is largely concerned with the detailed analysis of cases that the issues of illegal storage in the Czech Republic opened, that is, cases of illegal storage communities Libcany, Chvaletice and Nalžovice. Interestingly a certain comparison was analyzed other events associated with such dealings, and in 2010 in the village of Bela nad Svitavou . This case was very specific and publicized in the media, with regard to the fact that the property owner had a mental disorder. There is also outlined what motives leading operators of these stores for their operation. Great time and especially financial cost of illegal disposal of stores is devoted to the next chapter. In connection with this chapter builds on the measures taken immediately for further such objects as identifying and initiating a control action called " brownfields". Part of the work dealing with the simulation of a potential hazard in the event that occurred some of these accident scenarios is very alarming. Terex program to simulate leakage of hydrogen cyanide in a specific amount, which was formed by the reaction of potassium cyanide and inorganic acids. Given that the placement of substances in the warehouse disregarded, and the material rather than with expertise stored with the need to save the maximum space, this reaction actually could occur. Simulated the escape of a former factory in the village Vertex Libcany. Indeed, the alarming fact is that at a distance of one hundred meters from the house was situated kindergarten and elementary school, where the daily ranges to three hundred people. In conclusion the author's position is defined and assessment solutions to the operators concerned in the event of liquidation of illegal warehouse Libčany a definition of the fundamental weaknesses associated with the solution in these cases. Further proposals are discussed, especially legislative, methodological and organizational aspects that must be incorporated into the legislation of our country, so that in the future establishment of such a warehouse avoided. The final section describes the recommended procedures for what to do in the event of a chemical accident.
    Keywords: Odpad; Waste; Danger; Disposal; Nelegální Sklad; Chemikálie; Nebezpečí; Storage; Chemicals; Skladování; Illegal Storage; Likvidace
    Source: Networked Digital Library of Theses and Dissertations
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  • 2
    Language: English
    In: The Science of the Total Environment, Dec 1, 2015, Vol.535, p.113(9)
    Description: To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.scitotenv.2015.03.023 Byline: Samuel K. Kumahor, Pavel Hron, George Metreveli, Gabriele E. Schaumann, Hans-Jorg Vogel Abstract: Chemical factors and physical constraints lead to coupled effects during particle transport in unsaturated porous media. Studies on unsaturated transport as typical for soils are currently scarce. In unsaturated porous media, particle mobility is determined by the existence of an air-water interface in addition to a solid-water interface. To this end, we measured breakthrough curves and retention profiles of citrate-coated Ag nanoparticles in unsaturated sand at two pH values (5 and 9) and three different flow rates corresponding to different water contents with 1mM KNO.sub.3 as background electrolyte. The classical DLVO theory suggests unfavorable deposition conditions at the air-water and solid-water interfaces. The breakthrough curves indicate modification in curve shapes and retardation of nanoparticles compared to inert solute. Retention profiles show sensitivity to flow rate and pH and this ranged from almost no retention for the highest flow rate at pH=9 to almost complete retention for the lowest flow rate at pH=5. Modeling of the breakthrough curves, thus, required coupling two parallel processes: a kinetically controlled attachment process far from equilibrium, responsible for the shape modification, and an equilibrium sorption, responsible for particle retardation. The non-equilibrium process and equilibrium sorption are suggested to relate to the solid-water and air-water interfaces, respectively. This is supported by the DLVO model extended for hydrophobic interactions which suggests reversible attachment, characterized by a secondary minimum (depth 3-5kT) and a repulsive barrier at the air-water interface. In contrast, the solid-water interface is characterized by a significant repulsive barrier and the absence of a secondary minimum suggesting kinetically controlled and non-equilibrium interaction. This study provides new insights into particle transport in unsaturated porous media and offers a model concept representing the relevant processes. Article History: Received 9 December 2014; Revised 5 March 2015; Accepted 5 March 2015 Article Note: (miscellaneous) Editor: D. Barcelo
    Keywords: Nanoparticles – Analysis ; Multiprocessing – Analysis
    ISSN: 0048-9697
    Source: Cengage Learning, Inc.
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  • 3
    Language: English
    In: Science of the Total Environment, 01 December 2015, Vol.535, pp.113-121
    Description: Chemical factors and physical constraints lead to coupled effects during particle transport in unsaturated porous media. Studies on unsaturated transport as typical for soils are currently scarce. In unsaturated porous media, particle mobility is determined by the existence of an air–water interface in addition to a solid–water interface. To this end, we measured breakthrough curves and retention profiles of citrate-coated Ag nanoparticles in unsaturated sand at two pH values (5 and 9) and three different flow rates corresponding to different water contents with 1 mM KNO as background electrolyte. The classical DLVO theory suggests unfavorable deposition conditions at the air–water and solid–water interfaces. The breakthrough curves indicate modification in curve shapes and retardation of nanoparticles compared to inert solute. Retention profiles show sensitivity to flow rate and pH and this ranged from almost no retention for the highest flow rate at pH = 9 to almost complete retention for the lowest flow rate at pH = 5. Modeling of the breakthrough curves, thus, required coupling two parallel processes: a kinetically controlled attachment process far from equilibrium, responsible for the shape modification, and an equilibrium sorption, responsible for particle retardation. The non-equilibrium process and equilibrium sorption are suggested to relate to the solid–water and air–water interfaces, respectively. This is supported by the DLVO model extended for hydrophobic interactions which suggests reversible attachment, characterized by a secondary minimum (depth 3–5 kT) and a repulsive barrier at the air–water interface. In contrast, the solid–water interface is characterized by a significant repulsive barrier and the absence of a secondary minimum suggesting kinetically controlled and non-equilibrium interaction. This study provides new insights into particle transport in unsaturated porous media and offers a model concept representing the relevant processes.
    Keywords: Air–Water Interface ; Solid–Water Interface ; Engineered Nanoparticle ; Extended Dlvo Theory ; Unsaturated Flow ; Pore Structure ; Environmental Sciences ; Biology ; Public Health
    ISSN: 0048-9697
    E-ISSN: 1879-1026
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  • 4
    Description: A model for the aerobic and anaerobic growth of Escherichia coli (HB101 K12 pGLO) depending on the concentration of oxygen and DOC as substrate has been developed based on laboratory batch experiments. Using inverse modelling to obtain optimal sets of parameters, it could be shown that a model based on a modified double Contois kinetic can predict cell densities, organic carbon utilisation, oxygen transfer and utilisation rates for a large number of experiments under aerobic and anaerobic conditions with a single unique set of parameters. The model was extended to describe growth of E. coli in unsaturated porous media, combining diffusion, phase exchange and microbiological growth. Experiments in a Hele-Shaw cell, filled with quartz sand, were conducted to study bacterial growth in the capillary fringe above a saturated porous medium. Cell density profiles in the Hele-Shaw cell were predicted with the growth model and the parameters from the batch experiments without any further calibration. They showed a very good qualitative and quantitative agreement with cell densities determined from samples taken from the Hele-Shaw cell by re-suspension and subsequent counting. Thus it could be shown, that it is possible to successfully transfer growth parameters from batch experiments to porous media for both aerobic and anaerobic conditions. Comment: Minor changes in conclusions, results unchanged
    Keywords: Quantitative Biology - Cell Behavior
    Source: Cornell University
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  • 5
    Description: A multicomponent multiphase reactive transport simulator has been developed to facilitate the investigation of a large variety of phenomena in porous media including component transport, diffusion, microbiological growth and decay, cell attachment and detachment and phase exchange. The coupled problem is solved using operator splitting. This approach allows a flexible adaptation of the solution strategy to the concrete problem. Moreover, the individual submodels were optimised to be able to describe behaviour of Escherichia coli (HB101 K12 pGLO) in the capillary fringe in the presence or absence of dissolved organic carbon and oxygen under steady-state and flow conditions. Steady-state and flow through experiments in a Hele-Shaw cell, filled with quartz sand, were conducted to study eutrophic bacterial growth and transport in both saturated and unsaturated porous media. As E. coli cells can form the green fluorescent protein (GFP), the cell densities, calculated by evaluation of measured fluorescence intensities (in situ detection) were compared with the cell densities computed by numerical simulation. The comparison showed the laboratory experiments can be well described by our mathematical model.
    Keywords: Computer Science - Computational Engineering, Finance, And Science ; Physics - Biological Physics
    Source: Cornell University
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  • 6
    Language: English
    In: Journal of Contaminant Hydrology, December 2016, Vol.195, pp.31-39
    Description: Engineered nanoparticles released into soils may be coated with humic substances, potentially modifying their surface properties. Due to their amphiphilic nature, humic coating is expected to affect interaction of nanoparticle at the air-water interface. In this study, we explored the roles of the air-water interface and solid-water interface as potential sites for nanoparticle attachment and the importance of hydrophobic interactions for nanoparticle attachment at the air-water interface. By exposing Ag nanoparticles to soil solution extracted from the upper soil horizon of a floodplain soil, the mobility of the resulting “soil-aged” Ag nanoparticles was investigated and compared with the mobility of citrate-coated Ag nanoparticles as investigated in an earlier study. The mobility was determined as a function of hydrologic conditions and solution chemistry using column breakthrough curves and numerical modeling. Specifically, we compared the mobility of both types of nanoparticles for different unsaturated flow conditions and for pH = 5 and pH = 9. The soil-aged Ag NP were less mobile at pH = 5 than at pH = 9 due to lower electrostatic repulsion at pH = 5 for both types of interfaces. Moreover, the physical flow field at different water contents modified the impact of chemical forces at the solid-water interface. An extended Derjaguin-Landau-Verwey-Overbeek (eDLVO) model did not provide satisfactory explanation of the observed transport phenomena unlike for the citrate-coated case. For instance, the eDLVO model assuming sphere-plate geometry predicts a high energy barrier (〉 90 ) for the solid-water interface, indicating that nanoparticle attachment is less likely. Furthermore, retardation through reversible sorption at the air-water interface was probably less relevant for soil-aged nanoparticles than for citrate-coated nanoparticles. An additional cation bridging mechanism and straining within the flow field may have enhanced nanoparticle retention at the solid-water interface. The results indicate that the mobility of engineered Ag nanoparticles is sensitive to solution chemistry, especially pH and the concentration of multivalent cations, and to the unsaturated flow conditions influencing particle interaction at biogeochemical interfaces.
    Keywords: Unsaturated Transport ; Water Dynamics ; Cation Bridging ; Amphiphilic ; Edlvo ; Engineering ; Environmental Sciences ; Geography
    ISSN: 0169-7722
    E-ISSN: 1873-6009
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  • 7
    Language: English
    In: Acta Veterinaria Brno, 2009, Vol.78(2), pp.287-291
    Description: The objective of this contribution was to present a case report of gastrointestinal stromal tumour (GIST) in one guinea pig: a pet animal, male, 3.5 year of age, tricolour. Approximately for five weeks before death wasting, in spite of good appetite, decreased locomotor activity, soft and malodorous faeces were observed by the owner. The animal spontaneously died and at necropsy a grey-pink coloured tumour of walnut size located in the terminal segment of the ileum was observed. A solid malignant tumour of mesenchymal appearance was diagnosed histologically. One part of the sample consisted of tightly packed spindle cells arranged in interlacing fascicles, in the other part epithelioid cells predominated with slightly myxoid intercellular matrix. Lymphocytic sheaths were observed around some blood capillaries. Immunohistochemistry revealed positivity for actin, CD 117, neuron-specific enolase, glial fibrillary acidic protein, and p53 protein; however, desmin, S100 protein and synaptophysin were negative. On the basis of histological and immunohistochemical examinations GIST was diagnosed.
    Keywords: Veterinary Medicine;
    ISSN: 0001-7213
    E-ISSN: 1801-7576
    Source: CrossRef
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  • 8
    Dissertation
    Dissertation
    Vysoká škola ekonomická v Praze
    Language: Czech
    Description: Práce se zabývá marketingem jemných kovových obalů a legislativní úpravou jejich životního cyklu ze strany České republiky a Evropské unie. Na základě vlastního výzkumu jsou doporučeny úpravy marketingové strategie jejich výrobci, společnosti Impress Znojmo, a.s.
    Source: Vysoká škola ekonomická (University of Economics, Prague)
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  • 9
    Dissertation
    Dissertation
    Vysoká škola ekonomická v Praze
    Language: Czech
    Description: Cílem diplomové práce je stanovení tržní hodnoty podniku pro vrcholové vedení. Zjištěné výsledky budou sloužit při dalším řízení společnosti. Použití výnosových metod - metody diskontu FCFF a metody EVA. Vypracování strategické a finanční analýzy - potvzení předpokladu pokračování společnosti ve své činnosti. Popsání současné situace nejdůležitějších makroekonomických ukazatelů a zkoumání jejich prognózy do budoucna. Sestavení finančního plánu a stanovení výsledné hodnoty společnosti.
    Keywords: Mikrookolí ; Makrookolí ; Eva ; Metody Oceňování ; Finanční Analýza ; Finanční Plán
    Source: Vysoká škola ekonomická (University of Economics, Prague)
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  • 10
    Dissertation
    Dissertation
    Vysoká škola ekonomická v Praze
    Language: Czech
    Description: Finanční analýza - hodnocení finančního hospodaření za 5 roků. Účel - vyhodnocení hospodaření v střednědobém horizontu a odhalení jeho slabých a silných stránek. Horizontální a vertikální analýza účetních výkazů, analýza poměrových ukazatelů a analýza soustav ukazatelů. Nerovnost, ekonomický normál, Altmanova analýza, indexy IN. Ze souhrnných modelů hodnocení finanční úrovně jsem použila Kralickův rychlý test, Taflerův model, Tamariho bonitní model, Beaverův model, Beermanova diskriminační funkce, index bonity. EVA. Mezipodnikové srovnání.
    Keywords: Souhrnné Modely Hodnocení Finanční Úrovně ; Poměrové Ukazatele ; Finanční Analýza
    Source: Vysoká škola ekonomická (University of Economics, Prague)
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