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Showing 1 to 20 of 45 for “"induction time"”.
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Ice scaling in continuous eutectic freeze crystallization
… This research focused on determining the induction time, defined as the time between initial nucleation and scale layer formation, where shorter induction times are associated with more severe scaling tendencies. The experimental work was conducted in a hybrid crystallizer-separator with a …
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Surface chemical aspects of microbubble flotation
… length.The effects of different collectors on induction time and flotation have been determined by conducting microflotation and induction time experiments using an Elkhorn seam coal sample. The results show that industrial oils combined with the coal have the shortest induction times and, …
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Investigating the Effect of Surface Properties on Ice Scaling in Eutectic Freeze Crystallization
… of observation was effective, asfor the first time in a continuous system, the crystallization of the initial ice scale layer was observable in-situ and in real-time. Therefore, with this method, it was possible to investigate the evolution of the predominantscaling modes(nucleation and …
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Nuosėdų formavimosi sistemose CuSO4 – K4P2O7 – H2O ir CuSO4 – (NH4)4P2O7 – H2O mechanizmo tyrimas /
… – K4P2O7 – H2O system may be formed after some time in the reaction mixture as a result of the following heterogeneous reaction: 3Cu2P2O7∙5H2O↓ + H2P2O72– + 4K+ → 2Cu3K2(P2O7)2∙3H2O↓ + 2H+ + 9H2O This reaction has not been previously described for any polyphosphate system. Therefore, novel …
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Analysis of nucleation kinetics in pH-shift crystallization using agitated and microfluidic systems
… compound) through data generated from isothermal induction time experiments in small scale agitated vials and in a novel microfluidic device. The objectives were to gain a detailed understanding of the model system, to accurately determine solubility and supersaturation, collect nucleation rate …
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Kinetics of bubble-particle adhesion in flotation
… quartz-amine system has been studied using an induction time apparatus constructed in the present work which has a sensitivity limit of 100-150 micro-seconds. The basic unit is similar to the one used by Eigeles and Volova (1960) and Trahar (1983), but it operates with a micro-computer and has …
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Kinetics of Nesquehonite Nucleation
… saturation states. In these experiments, the induction time is calculated using a new turbidity method, and the induction time correlates with the saturation state which is consistent with the classical nucleation theory (CNT). The calculated surface energy is found to be correlated with log …
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Influence of impurities on the crystallisation of pharmaceutical materials
… hydrochloride samples and their effect on induction time and nucleation kinetics. Crystallisation from solution plays a significant role in the pharmaceutical, chemical and food industry, because it is widely used as a separation and purification technique. Nucleation is the first step of …
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Chemical and Biological Treatment of Acid Mine Drainage for the Removal of Heavy Metals and Acidity
… base was added at a OH/Fe ratio of less than 3. Induction time was found to be a function of pH, sulfate concentration and iron concentration, with a multiple R² of 0.84. Aqueous [Al (III)] and [Mn (II)] did not significantly (α = 0.05) affect induction time over the range of concentrations …
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The Effect of Selective Hypothermia on Stroke Volume
… area may eliminate side effects while improving induction time. We studied the effect of selective hypothermia on stroke volumes in adult domestic swine. Under general anesthesia, one MCA was occluded transcranially for 3 hours followed by 3 hours of reperfusion. In half the animals, hypothermia …
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Comparisons of computational methods to represent electron transport in nonequilibrium plasma devices
… has been developed. In the two-dimensional, time dependent model, fluid equations are solved to obtain the electron and ion densities, and Poisson's equation is solved for the electric potential. These equations can be solved using the local field approximation (LFA), employing conservation …
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Polymer Crystallization: Micro- and Nano- Filler Effects on Isotactic Polypropylene
… presence of a nucleating agent (NA) shortens the induction time as well as enhances the overall rate of transformation from the molten state to the crystalline solid state. A shortening of the induction time due to a NA is obviously understandable since the polymer melt does not have to form its …
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Thermodynamics of λ-PCR Primer Design and Effective Ribosome Binding Sites
… methods are expensive and require significant time and labor; λ-PCR, a new cloning method developed in the Senger lab, has a number of advantages compared to other cloning processes due to its employment of relatively inexpensive and widely available materials and time-efficiency. While the …
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The Study of Variations in the Properties of Biodiesel on Addition of Antioxidants
… Oxidation onset temperature, oxidation induction time, oxidative stability, thermal stability, crystallization onset temperature and moisture retention properties of the biodiesel, with and without antioxidants have been studied. Antioxidants like BHT, BHA, PrG, Vit E and Vit C were …
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An Investigation of Phase Behavior and Crystal Nucleation Kinetics in Solutions of Globular Proteins
… of nucleation are characterized using nucleation induction time measurements. This thesis presents a detailed investigation of the links between strength of interactions, equilibrium phase behavior and kinetics of crystal nucleation in solutions of globular proteins.
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Antioxidant properties of flaxseed lignans using in vitro model systems
… respectively, compared to BHT 17 (2.0). The induction time by Rancimat analyzer measured inhibition of autoxidation mediated by flaxseed lignans SECO, SDG and SDG polymer in comparison with BHT 17. The induction time data demonstrated that SECO 2 protected canola oil better than either SDG 1 …
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The effect of voltage wave form on the operation of two types of current overload relays
The Westinghouse Induction Time Klement Overload Relay, Type CO, a relay operating on the same principle as an alternating current watt-hour meter, is considerably affected in its time of operation when non-sinusoidal waves of potential are applied. If the potential wave applied has a flat top or …
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Heterogeneous nucleation of active pharmaceutical ingredients on polymers : applications in continuous pharmaceutical manufacturing
… that include these angles. Nucleation induction time trends showed that heterogeneous nucleation rates were accelerated by at least an order of magnitude in the presence of PVA due to the favorable interactions between the model compounds and the polymer. Nucleation rates were further …
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Spatial and temporal control of lipid-membrane morphology induced by sphingomyelinase
… the overall statistical distribution of the induction time of a slow domain nucleation and therefore fairly compare the membrane responses caused by different factors. In addition, the flow control by a microfluidic device solves the difficulty of distributing SMase uniformly to membrane …
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Effective teacher retention : Sustaining quality novice instructors through induction
… understanding of the effectiveness a teacher induction program has on transitioning and retaining novice teachers on the suburban secondary level. Induction programs are defined as a comprehensive, coherent, and sustained professional development process that is organized by a school district …
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