National Repository of Grey Literature 98 records found  1 - 10nextend  jump to record: Search took 0.00 seconds. 
Porous polymer networks prepared from ethynylpyridines
Titlová, Štěpánka ; Sedláček, Jan (advisor) ; Sedláček, Ondřej (referee)
Series of new micro/mesoporous polymer networks with high content of pyridine segments was prepared. For the preparation were used ethynylpyridine type of monomers which were successfully homopolymerized and copolymerized with hydrocarbon diethynylarenes by chain-growth coordination polymerization catalyzed with [Rh(NBD)acac] complex. Polymerizations provided polyacetylene networks with main chains densely cross- linked by pyridine or arylene links. Prepared pyridine networks showed specific surface area SBET from 308 m2 /g to 923 m2 /g and variable content of pyridine segments in an interval from 3,27 mmol/g to 7,86 mmol/g. In networks, pyridine segments made part of interchain links or side groups. Networks with pyridine segments were successfully quaternized by heterogeneous postpolymerization reaction with bromoethane to form well covalently defined networks containing N-ethylpyridinium segments. Quaternized networks containing pyridinim segments in amount from 2,41 mmol/g to 4,24 mmol/g had preserved micro/mesoporous texture with values of SBET from 331 m2 /g to 592 m2 /g. Polyacetylene networks with N-ethylpyridinium segments were prepared also by catalyst-free (spontaneous) quaternization polymerization of diethylpyridines. These networks were worse covalently defined and had proved lower...
Price Development of Apartments in Opava
Olbrechtová, Zuzana ; Sedláček, Jan (referee) ; Klika, Pavel (advisor)
This master’s thesis focuses on the price development of apartments in the central part of the city Opava. The introductory part defines the methodology of the apartment appraisal and the basic terms used in this topic. Further on, the database used in this thesis to achieve stated objectives is specified and evaluated. The Data are based on a documented purchase price of apartments, existing market value appraisal and ascertained assessed value. The development of purchase prices, market value and assessed value are being researched in the city of Opava. Furthermore, the development of the above-mentioned prices and values is researched in particular cadastral areas in the central part of Opava. The impact of aspects relating to apartment, building and locality are being evaluated. In conclusion, results of the local research are compared with the Czech Republic and selected countries of the European Union.
Characterization of microorganisms with biodegradation potential for sulfonamides
Sedláček, Jan ; Palyzová, Andrea (advisor) ; Mikušová, Gabriela (referee)
Sulfonamides are antibiotics that are frequently used both in human and veterinary medicine. The combinations of abundant use of these antibiotics and their natural resistance to decay leads often to long term persistence in the environment. This accumulation, especially in living organisms, may lead to subsequent toxicosis. Also, presence of these antibiotic in nature poses problems with regard to the spread of genes for antibiotic resistance between potential pathogens. These facts led to an increase interest in studying the sulfonamide biodegradation and subsequent sulfonamide removal from the environment. In this work it was possible to isolate and characterize the microorganism Acinetobacter sp. strain 49. This microorganism was able to biodegrade under right conditions sulfamethoxazole with 80 % efficiency. Sulfamethoxazole is one of the most commonly found sulfonamide in the nature.
Preparation of polyacetylenes with N-benzylidene-2-hydroxyaniline groups
Zhernakova, Yulia ; Sedláček, Jan (advisor) ; Vyskočilová, Eliška (referee)
The following monoethynylated N-benzylidene-2-hydroxyanilines were prepared: N-(4- ethynylbenzylidene)-2-hydroxyaniline, N-(3-ethynylbenzylidene)-2-hydroxyaniline, N-(4- ethynylbenzylidene)-2-hydroxy-5-nitroaniline and N-(3-ethynylbenzylidene)-2-hydroxy-5- nitroaniline, which differed in the position of the ethynyl group on the benzylidene ring and the substitution of the hydroxyaniline ring. Monoethynylated N-benzylidene-2- hydroxyanilines were used as the monomers for the chain-growth coordination homo- and copolymerization. The homopolymerization resulted in linear polyacetylene homopolymers with N-benzylidene-2-hydroxyaniline substituents. The copolymerization with multiethynylarene-type cross-linkers provided densely cross-linked copolymeric polyacetylene networks. The linear units of the networks carried N-benzylidene-2- hydroxyaniline substituents, the interconnection between the chains of the networks being realized by arene links. The texture parameters of the prepared networks significantly depended on the type of comonomers used. The highest specific surface area values (~530 m2 /g) were achieved with networks prepared by copolymerization of N-(4- ethynylbenzylidene)-2-hydroxyaniline or N-(3-ethynylbenzylidene)-2-hydroxyaniline,with 4,4'-diethynylbiphenyl used as a cross-linker. Selected...
Structure-Space-City "Urban block completion"
Darda, Lukáš ; Sedláček, Jan (referee) ; Nový, Vítězslav (advisor)
The thesis deals with the examination of the possibility of designing a high-rise building on the corner of Milady Horákové and Černopolní streets, as a reaction to the important composition axis of the city and emphasizing the distinctive compositional element in the urban landscape, its panorama. The object takes into account the importance of the space and the complexity of the cramped parcel in relation to the adjacent building. It functionally combines commercial, residential and administrative functions with respect to the nature of the place.
Organometallic polyacetylene networks
Šorm, David ; Sedláček, Jan (advisor) ; Balcar, Hynek (referee)
A new type of organometallic polymer networks with a covalent structure of cross-linked substituted polyacetylenes containing Cu2+ or Pd2+ ions (5 to 17 wt%) has been developed. The metal ions were complexed in the networks predominantly with two N-salicylideneaniline ligands covalently bound to two different network monomeric units. Due to the chosen method of complexation, the metal ions have actively participated (as knots of the network) in the formation of cross-linked architecture of the products. For the preparation of organometallic networks two independent methods were used: (i) the direct polymerization of organometallic monomers and (ii) the two-stage method using postpolymerization introduction of metal ions into polyacetylene polymers containing covalently bound N-salicylideneaniline proligands. The starting low-molecular-weight blocks used for the network synthesis were new substances prepared within the framework of the diploma thesis, namely monomers of the mono- and diethynylated N-salicylideneanilines type and diethynylated organometallic monomers in which two molecules of a monoethynylated N-salicylideneaniline complexed one Mt2+ ion. The ethynylated monomers were polymerized to organometallic networks or precursors of these networks via chain-growth coordination polymerization,...
New selective adsorbents and sensors based on microporous polymers with releasable links
Hašková, Alena ; Sedláček, Jan (advisor) ; Feltl, Ladislav (referee)
A new concept of Porous Organic Polymers (POP) of the type of hyper-cross- linked networks was implemented, in which the main (polyacetylene) chains were cross-linked both by permanent (biphenylene-type) and releasable (N-benzylideneaniline-type) links. It has been shown that the azomethine groups of the N-benzylideneaniline links of the networks can be readily and efficiently dissociated by means of hydrolysis or transmination. The dissociation of the azomethine groups accompanied by links releasing leads to a change in the covalent structure and texture of the networks. The composition of the networks has been optimized to maintain porous texture after releasing the N-benzylideneaniline links. Two possibilities of potential use of the new POP type for analytical chemistry applications have been studied. It has been shown that newly prepared POPs have a high capacity in the selective and reversible chemisorption of primary aromatic amines and hydrazines from solutions. The networks can be used repeatedly for these purposes, the chemisorption being carried out through transimination in the first use and through condensation of the aldehyde and amine groups in the subsequent uses. Thus, prepared POPs could potentially serve to extract primary aromatic amines from more complex mixtures of analytes....

National Repository of Grey Literature : 98 records found   1 - 10nextend  jump to record:
See also: similar author names
25 SEDLÁČEK, Jan
10 Sedláček, Jakub
1 Sedláček, Jaromír
5 Sedláček, Jaroslav
1 Sedláček, Jindřich
15 Sedláček, Jiří
2 Sedláček, Jiří,
5 Sedláček, Josef
4 Sedláček, Jozef
2 Sedláček, Juraj
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