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 70 for “"depressant"”.
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Serotonin receptor mechanisms in anti-depressant action
… depression to treatment with serotonergic antidepressants. To assess the effect of repeated treatment with selective serotonin re-uptake inhibitors (SSRI's) on the function of central 5-HT2c receptors I used the 5-HT2C receptor agonist, m-chlorophenylpiperazine (m-CPP) as a 5-HT2c probe in a …
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Investigating depressant behaviour in the flotation of selected Merensky ores
… with different mineralogy, in the presence of depressants; and contributes to the increased understanding of depressant behaviour in the flotation of Merensky ores. The ores were obtained from the southern section of the Merensky reef in the Bushveld Igneous Complex.
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Investigating collector and depressant performance in the flotation of selected iron ores
… at using different polysaccharides as hematite depressants entailed the use of a CMC and a guar gum in batch flotation tests of the Brazilian iron ore.
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The interactive effect of depressant type and dosage with frother dosage in the flotation of a PGE ore
… and grade decreases. In the rougher float depressants are added to produce a manageable froth and improve the grade by reducing the overall amount of the naturally floating gangue in the concentrates. Depending on dosage, depressants may also affect the recovery of the valuable minerals in …
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The influence of polymeric charge and structure, molecular weight and ionic conditions on depressant ability to reduce the natural floatability of talc
… (PGM) ore bodies. Long chain polysaccharide depressants are effective in depressing talc flotation and improving the grade of the concentrates of those ores with talc as a gangue constituent. This thesis describes an investigation into the surface interactions of two types of long chain …
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The application of a machine vision system to relate to froth surface characteristics to the metallurgical performance of a PGM flotation process
… on the influences that changing the frother and depressant dosage levels had on a flotation system treating a sample of Merensky ore, which originated from Rustenburg Platinum Mine's Amandelbult Section. It was found that both depressant and frother dosage had marked influences on the …
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Developing a relationship between ore feed grade and flotation performance
… of varying ore feed grade, water quality and depressant dosage on the overall flotation performance. Froth column tests showed how froth stability, as measured by the froth height and dynamic froth stability, was affected by the changes in ore feed sulphide grade and ionic strength of plant …
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Angiotensin II modulates glutamate-induced depolarizations and synaptic transmission in rat locus coeruleus neurons in vitro.
… applied together with peptidase inhibitors, the depressant action on Glu responses was observed. Like AII, angiotensin III (AIII) also had depressant actions on Glu responses in LC neurons, but the action of AIII appeared to be less potent than that of AII. In addition to its strong depressant …
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An investigation into the effect of ionic strength of plant water on valuable mineral and gangue recovery of a platinum bearing ore from the Merensky reef
… in the ionic strength in the absence of any depressant caused an increase in Cu and Ni recovery.
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Relationship between flotation operational factors and froth behaviour
… froth heights, superficial air rates and depressant dosages in a 2 m high Plexiglass column, using a PGM bearing UG2 ore from the Bushveld Igneous Complex. Four concentrate and tailings samples were simultaneously collected and solids and water recoveries were determined. Assays of the …
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Characterization of Titanium Alkoxide- Based Sol-Gel Systems and their Behavior in Icephobic Coatings
… matrix and a multi-component melt-point depressant. The melt-point depresssant complex consists of a titanium alkoxide-based sol-gel system designed to facilitate the slow-release of tripropylene glycol (TPG) and glycerol to the coating surface. The presence of these compounds is …
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Transient liquid-phase infiltration of a powder-metal skeleton
… of the skeleton material plus a melting point depressant in order to facilitate homogenization after the liquid metal fills the void space. Parts over 20 cm tall with final compositions of Ni-4wt%Si and Ni-40wt%Cu were made by TLI from powder skeletons of pure nickel. Tensile tests after HIP …
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Investigation of the effect of different frother blends on the flotation of selected PGM bearing ores
… mineral (PGM) bearing ores use polysaccharide depressants to reduce the recovery of the naturally floatable gangue minerals (mainly silicates) present in the ores. Recent work has shown that high depressant dosage can completely depress the naturally floatable gangue from reporting to the …
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Relationship between froth behaviour and the properties of particles
… hydrophobicity was changed by the addition of depressant and the performance of the froth phase was measured in terms of froth recovery.
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Analysis of the behavioural effects of barley and sertraline in two in-vivo models of stress.Anti-depressant and anti-nociceptive effects of barley in mice and sertraline effects on anxiety in the offspring of prenatally-stressed rats
To prove the post-natal depression model, the antidepressant sertraline, was assessed in rat mothers (n=14) divided into Prenatally Stressed (PS) and Non-Stressed (NS) groups. The data failed to support the hypothesis that ‘the progeny of 10mg of sertraline-treated PS mothers displayed less anxiety …
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Analysis of the behavioural effects of barley and sertraline in two in-vivo models of stress.Anti-depressant and anti-nociceptive effects of barley in mice and sertraline effects on anxiety in the offspring of prenatally-stressed rats
To prove the post-natal depression model, the antidepressant sertraline, was assessed in rat mothers (n=14) divided into Prenatally Stressed (PS) and Non-Stressed (NS) groups. The data failed to support the hypothesis that ‘the progeny of 10mg of sertraline-treated PS mothers displayed less anxiety …
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An investigation into the impact of residual reagents on flotation in response to process water recirculation
… that were considered at varying dosages; the depressant, flocculant and coagulant. The two levels were high and low (where low was no addition of the respective reagent and high was equivalent to the concentrate seen on site recirculated process water). The key performance parameters used to …
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The Use of ThorazineR (Chlorpromazine Hydrochloride) as an Aid to Analgesia and Amnesia During Labor and Delivery
… employed alone or in combination. Because of the depressant properties of these drugs, they cannot be used without due consideration of these effects. Thus the search continues for more efficient agents to relieve the pains of labor and still provide absolute safety for the infant and mother.
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Study of effect of process parameters and their interaction in the flotation of UG2 ore
… most important are froth height, air flow rate, depressant dosage and frother concentration. On an individual level, it is expected that an increase in froth height will result in the reduction of the mechanical entrainment of chromite due to an increase in the residence time of air in the froth …
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Adsorption of dextrin onto sulphide minerals and its effect on the differential flotation of the Inco matte
… as collector. To select an effective organic depressant, many dextrins were tested and tapioca dextrin 12 was found to have an exceptional affinity towards heazlewoodite surface at a particular pH of the mineral suspension. A new reagent system, involving the use of this dextrin as a modifying …
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