Global ETD Search

41	Comparison of geoenvironmental properties of caustic and noncaustic oil sand fine tailings Miller, Warren Gregory Unknown Date No description available. oil sands fine tailings water chemistry compressibility hydraulic conductivity consolidation large strain void ratio settlement effective stress dispersion coagulant sodium adsorption ratio caustic noncaustic shear strength vane shear thixotropy thixotropic strength particle size distribution fines content structure flocculation index properties specific surface area hydraulic deposition flume tests beach slope flow rate slurry concentration self weight consolidation geoenvironmental properties bitumen extraction
42	Vliv jemnozrnných příměsí na charakter pórového systému betonu / The Influence of Fines on Pore System of Concrete Elfmarková, Veronika January 2013 (has links) Literature does not provide a satisfactory answer to maximum and minimum particle size or the particle size of the mortar phase especially for optimal porosity of concrete. To overcome the shortcomings of the design methods were thought to design a new method for design of concrete mix. This idea is based on a complex analysis of powder materials (determination of granular properties, shape factor of fillers, porosity, packing of powder materials, surface area, etc.) and subsequently to assess the influence to pore system of concrete and physical and mechanical properties in hardened state of concrete. In this work are presented and analyzed two types of fillers – fly ash and limestone dust.
43	Návrh koncepce využívání mikropříměsí pro betony vysokých užitných vlastností / Proposition of conception of using micro-additions for High Performance Concrete Lédl, Matěj January 2014 (has links) The modern, contemporarily used cement composite types make use of various additives. This diploma thesis is focused on designs of mortars that have been enriched with micro and nano additives, which lead to higher mechanical strength through optimized grading of mortar mixes. This thesis also evaluates the influence of material properties on resulting properties of mortars in fresh and hardened state.
44	Funkcionalizované mikroporézní polymerní sítě připravené z ethynylarenů / Functionalized microporous polymer networks prepared from ethynylarenes Stahlová, Sabina January 2016 (has links) The preparation of a new group of functionalized conjugated polymer networks has been described based on spontaneous quaternization polymerization of ethynylpyridines with bis(bromomethyl)arenes. The networks consisted of polyacetylene chains with pyridyl and pyridiniumyl pendants cross-linked with -CH2(arylene)CH2- links. The variation of the ratio of monomer and quaternization agent in the feed modified the ratio of pyridyl and pyridiniumyl groups in the networks (pyridyl/pyridiniumyl ratios from 0 to 1.32). The networks did not exhibit a permanent microporosity that could be confirmed by nitrogen adsorption at 77 K. Nevertheless, all networks were active in capture of CO2 at 293 K (up to 0.73 mmol CO2/g, 750 Torr). It has been hypothesized that CO2 capture reflected formation of a temporary porous texture of the networks through conformational changes of the network segments enabled by the segments mobility at room temperature. The preparation of functionalized conjugated polymer networks with permanent micro/mesoporosity (SBET up to 667 m2 /g) has been described that was based on chain coordination copolymerization of acetylenic monomers. The copolymerization of 1,4-diethynylbenzene or 4,4'-diethynylbiphenyl with mono or diethynylbenzenes bearing NO2 or CH2OH groups has been demonstrated as...

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