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 23 for “"column design"”.
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Density Modulated Semi-Packed Micro Gas Chromatography Columns
… requirements of previously reported semi-packed columns causes a significant sacrifice in separation efficiency. This thesis covers the techniques for evaluating the separation column in a gas chromatography system as well as the important parameters that have the most effect on a column’s …
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The Morphological Development of Aspergillus Niger in Tower Fermenter Culture
… was the improvement of basic tower fermenter designs at laboratory and pilot scale. The fermentation conditions in a tower fermenter constitute a complex multivariate system, and therefore account has had to be taken of a wide variety of variables, each of which may affect or be affected by …
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Evaluation of software for analysis and design of reinforced concrete structures
… compare the linear static analysis and concrete design capabilities of two structural analysis and design programs - MicasPlus and STAAD III. Four structures were considered including a four span continuous beam, a two story 3-D frame, a seven story 3-D frame, and a fourteen story 3-D frame. The …
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An investigation of wood box columns to determine formulas for their design
The strength of 102 wood box columns of air-dry dense select southern pine was investigated in order to determine formulas for their design. Constructional variables such as column slenderness; plank thickness, fastening, and arrangement; and the use of spacers for individual plank stiffening were …
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Hybrid simulation of steel frames with semi-rigid connections
… connection. The latter configuration can be designed to exhibit moment capacities that are lower than both the connected beams and columns. Such ‘partial strength connections’ provide attractive seismic design features by alleviating the overstrength requirements that codes impose on column …
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Investigations concerning the reactions of small molecules with a series of pentacoordinate manganese complexes and the characterization of a solvent refined coal
… Coal has been presented. A novel chromatographic column design has been developed which allows the rapid quantitative GPC separation of coal liquid products on a preparative scale, Among several packings that were examined Bio-Beads S-X4 proved to be the superior material. Molecular weights on …
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Comparison of Dairy Manure Anaerobic Digestion Performance in Gas-lift and Bubble Column Digesters
… with confined (gas-lift) and unconfined (bubble column) design. The anaerobic digestion performance and mixing behaviors were studied at different gas recirculation rate. It was found that the biogas production from the bubble column was constantly higher than that from gas-lift digester. …
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Optimal Design of Single Factor cDNA Microarray experiments and Mixed Models for Gene Expression Data
… on a large scale. E- and A-optimality of mixed designs was established for experiments with up to 26 different varieties and with the restriction that the number of arrays available is equal to the number of varieties. Because the IBD setting only allows for a single blocking factor (arrays), …
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Countercurrent chromatography of proteins using aqueous two-phase systems
… aJ- type CCC centrifuge fitted with a multilayer column; the variable parameters examined were centrifuge rotational speed, mobile phase flow rate and direction, and type of mobile phase. A set of optimum conditions were identified that gave good retention and stability of the phases in the …
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Design of One-Story Hollow Structural Section (HSS) Columns Subjected to Large Seismic Drift
During an earthquake, columns in a one-story building must support vertical gravity loads while undergoing large lateral drifts associated with deflections of the vertical seismic force resisting system and deflections of the flexible roof diaphragm. Analyzing the behavior of these gravity columns …
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FOOTING FIXITY OF BRIDGE PIER WITH END-BEARING PILE FOUNDATION
<p>The degree of footing fixity G value of a column is a parameter which represents the rotation restraint at the base of a column. By using G values, the effective length factor K of the column can be calculated. The K value is used to check if the effect of slenderness needs to be considered for …
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DETERMINATION OF CO AND MN IN MARINE WATERS USING FLOW INJECTION WITH CHEMILUMINESCENCE DETECTION
This thesis describes the design, optimisation and shipboard deployment of a flow injection - chemiluminescence (FI-CL) technique for the determination of cobalt (Co) and manganese (Mn) in seawater. Chapter One presents an overview of the marine environment and the biogeochemistry of Co and Mn. …
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Mechanisms of liquid extraction in a pilot plant sieve plate column
… perforated (sieve)plate liquid-liquid extractor columns has been reviewed. An experimental investigation was conducted in a 450 mm diameter perforated plate extractor with four plates using four different designs with holes of 1.588 mm, 3.175 mm, 4.763 mm and 6.350 mm, each with adjustable …
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A Modified AISC P -M Interaction Curve for Square Concrete Filled Tube Beam -Columns
Concrete filled tube (CFT) columns have been in the spotlight over the world for the last decades due to their excellent performance. Although CFT members have many advantages over other structural systems, they have not been widely used in the U.S., mainly because of the lack of knowledge about …
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Controlling trace impurities in a dividing wall distillation column
Dividing wall distillation columns (DWCs) separate a feed mixture into three pure product streams using one column shell. Though attractive due to capital and operational savings, DWCs have yet to gain widespread industrial acceptance. One notable concern is controllability. The research within …
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Material Use and Efficiency in Ultra-Thin Towers
… the thesis, four main questions arise around the design and construction of these towers. The first is, to make such unprecedented towers, how much more material is used in comparison to traditional towers found in the deQo database? Secondly, based on this material usage, how much more of an …
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Influence of fly ash and other treatments on acid mine drainage from coal refuse
… likely to produce acid mine drainage (AMD). A column technique was designed and implemented to evaluate the effects of various AMD mitigation treatments including fly ash, topsoil, lime, and rock-P. Two types of fly ash were tested, one at four blending rates, the other at two rates. …
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Behaviour of Bubble Columns with Two and Three Phases
Bubble columns are multi-phase contactors widely used in the process industries. For proper design, effective operation and analysis of such columns, knowledge of the fluid-dynamics, mixing and transport parameters is essential. Hitherto, most studies have been on simple two-phase systems in …
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Randomization analysis of experimental designs under non standard conditions
… assumptions of the ANOVA for an experimental design are not met or the statistical model is incorrectly specified. Randomization of treatments to experimental units is expected to protect against such shortcomings. This paper uses randomization theory to examine the impact on the expectations …
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