Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 227 for “"Specific Surface"”.
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A Subject Specific Surface Electromyography Model For Estimating L4/L5 Compressive Loading
… estimated to be $100 to $200 billion annually. Specific causes of LBP account for less than 15% of LBP cases. Heavy loading of the lumbar spine and tight hamstrings have been identified as risk factors for LBP. Tight hamstrings pull the pelvis posteriorly and reduce the lordosis of the spine, …
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Molecular characterization of a gene that is associated with Listeria monocytogenes serotype 4b-specific surface antigen expression
… were previously found to be involved in serotype-specific surface antigen expression of L. monocytogenes serotype 4b. One mutant, 27B6, derived from L.monocytogenes serotype 4b strain 2381L (Jalisco cheese outbreak), was found to be negative in immunoblot reactions with all three serotype …
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Ionic exchange capacity as related to relative specific surface, particle size, and types of clay minerals present in certain soils and clays
To view the abstract, please see the full text of the document.
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Evaluation of the effect of fines on asphalt concrete
… This research consists of the evaluation of the surface area of different aggregates used in the state of West Virginia. This factor is important because the amount of asphalt needed to coat the aggregate depends on the specific surface area of the aggregate blend. The specific surface area of …
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Synthesis and characterisation of hypercrosslinked polymer microparticles and their functionalised derivatives
High specific surface area, microporous polymer particles were prepared successfully by using gel-type precursor particles, derived from non-aqueous dispersion (NAD) polymerisations of monomers in ethanol, in hypercrosslinking reactions. The precursor particles (containing 1 wt% of crosslinker) …
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ΜΕΛΕΤΗ ΕΠΙΦΑΝΕΙΑΚΩΝ ΙΔΙΟΤΗΤΩΝ ΚΑΙ ΚΑΤΑΛΥΤΙΚΗΣ ΔΡΑΣΤΙΚΟΤΗΤΑΣ ΠΑΡΑΣΚΕΥΑΣΜΑΤΩΝ ΥΔΡΟΞΕΙΔΙΩΝ ΤΟΥ ΑΡΓΙΛΙΟΥ
… WAS THE PREPARATION OF ALUMINUM HYDROXIDES WITH SPECIFIC SURFACE PROPERTIES AND CATALYTIC. THESE MATERIALS WERE PREPARED BY THE HYDROLYSIS OF ALCL3.6H2O IN AQUEOUS OR ALCOHOLIC SOLUTIONS AS WELL AS IN MIXED WITH ETHANOL AND ACETON AQUEOUS SOLUTIONS. AS PRECIPITATION AGENTS WERE USED THREE PRIMARY …
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The role of micropore size and chemical nature of the pore surface on the adsorption properties of activated carbon fibers
… activated carbon fibers (ACF) with a range of surface areas from 760 $\rm m\sp2/g$ to 2420 $\rm m\sp2/g,$ prepared from phenolic precursors were examined with acetone, n-butane, benzene and nitrogen. The experimental results revealed a counter-intuitive relationship demonstrating that lower …
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Ti3C2Tx as an Advanced Support Material for Polymer Electrolyte Fuel Cell Catalysts to Facilitate the Oxygen Reduction Reaction
… phases. The synthesis of high (>50 m2 g -1 ), specific surface area, delaminated Ti3C2Tx flakes was attempted first with mild in-situ HF conditions. While this method could both etch and delaminate flakes in a single stage, because the flake size remained large and unchanged, the specific …
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Ecological and Comparative Performance Studies on High-rate Sewage Filter Media
… oxidation in proportion to the media specific surface areas, Random packed media developed weights of biological film in proportion to their specific surface areas, Modular media supported significantly less film per wit of specific surface area. The dominant flora and fauna of …
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The influence of particle size on the chemistry of mica clays
… electron microscopy (TEM), thermogravimetry, specific surface area analysis, and ion exchange. Books of biotite and muscovite were reduced to clay size « 2.0 μm) particles by mechanical comminution, then further fractionated into coarse (0.2-2.0 μm), medium (0.08-0.2 μm), and fine (< 0.08 μm) …
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Study of Freeze-Cast Porous Silica Nanoparticle-Based Composites
… are promising ceramics, as they exhibit high specific surface area, highly porous network, and a surface that can be easily functionalized. This dissertation describes the results of a study on the formation and properties of porous silica nanoparticle-based composites, using techniques of …
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Synthesis and Environmental Applications of Mesoporous Alumina
… afforded mesoporous alumina materials with high specific surface area, large pore volume, and large pore width. This study showed that the specific surface area and porosity of alumina can be tuned to some degree by varying the polymer concentration and/or nitric acid concentration in the …
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Design of Titania Photocatalytic Membranes containing Fine Ceramic Fibres
… within the membranes, along with their porosity, specific surface area and mechanical properties, have been examined. These NAF-SAF membranes were impregnated with titania-based sol-gel coatings, to produce photocatalytic membranes. Their mechanical properties, specific surface area and flow …
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The competitive adsorption of surfactants in model dairy emulsions : a thesis presented in partial fulfillment of the requirements for the degree of Master of Food Technology at Massey University, Palmerston North, New Zealand
… of dairy products. The formation of new surface area and the adsorption of emulsifiers in the homogenizer influences the final particle size distribution. In addition, this provides insight on what surfactants may be present on the oil droplet surface. This in turn effect what …
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The preparation of solid core drug delivery system (SCDDS) via supercritical processing of fatty acids
… of BSA absorbed was observed with the increasing specific surface area of silica particles. Isotherms demonstrated that maximum absorption of BSA can be achieved at or close to the iso-electric point (IEP) of the protein. A SCDDS was prepared by absorbing BSA on silica at pH 5.0 in …
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Improvements on carbon nanotube structures in high-energy density ultracapacitor electrode design
… vapor deposition (CVD) to form porous, high-surface area electrodes. We demonstrate that the capacitance of CNT electrodes is very highly correlated to the morphological and geometrical features of the CNT forest. These features, such as areal density, mean nanotube diameter, and nanotube …
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Chemistry directed assembly of multilayered polymer thin films and colloidal particles
… have been directed to different regions of a surface based on both electrostatic and secondary interactions between the polymer and the surface. This concept of adsorption directed by surface chemistry is universal, in that the same sets of rules derived for polymeric systems can also be …
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Sintering of Co2MnO4 spinel for protective coatings in SOFC
… and reverse micelle) and the obtained specific surface area, structure and particle size were correlated with thermal behaviour, sintering temperature and achieved density. It was found that regardless the synthesis process the only obtained phase is Co2MnO4. Specific surface area from …
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The effect of flower-like tatania towards characteristics and performance of polysulfone mixed matrix membrane
… With consideration of the FLT that offer larger specific surface area as compared to ST that able to generate better performances and properties of polymer MMM. In this work, the polymer MMM of PSf/FLT and PSf/ST membranes were prepared via phase inversion method at five different concentrations …
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The electronic structure of galena and hematite surfaces: applications to the interpretations of STM images, XPS spectra and heterogeneous surface reactions
… helped to understand which states of the mineral surfaces were imaged depending on the bias voltage and tip-sample separation. The computational results also gave insight in electron transfer processes that take place during surface adsorption/oxidation/reduction processes. In this context, …
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