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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 57 for “"chloride concentration"”.
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Characterization of the Relationships between Soybean Yield, Trifoliolate Leaf Chloride Concentration, and Cultivar Chloride Inclusion/Exclusion Rating
<p>Chloride toxicity is recognized as yield limiting problem in soybean [Glycine max (L.) Merr.] production. Limited information is available to accurately diagnose and manage Cl toxicity. The only recommendation for Cl toxicity management is to plant an excluder cultivar, however the cultivar Cl …
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Chloride Penetration Resistance and link to Service Life Design of Virginia Bridge Decks
… concrete (RC) bridge decks are exposed to chlorides from deicing salts. Chloride ingress in RC initiates corrosion of the reinforcing steel. The high costs of corrosion have sparked interest in service life design of bridge decks. This thesis characterized the exposure conditions of …
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Development of a model for simulation of solute transport in a stream aquifer system
… is added to MT3D to simulate variable stream concentration by calling the SSTM. The SSTM is coded based on the one-dimensional advection dispersion equation. The finite difference method is the numerical technique implemented in the SSTM. MSAST is used to simulate chloride transport in the …
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Modeling the Time to Corrosion Initiation for Concretes with Mineral Admixtures and/or Corrosion Inhibitors in Chloride-Laden Environments
… to weekly ponding cycles of 6% (w/w) sodium chloride solution. In addition, cover depth measurements from 21 bridge decks and chloride data from 3 bridge decks were used, together with laboratory data, in modeling the service lives of the investigated corrosion protection methods. The methods …
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Effect of Stay-in-Place Metal Forms on Performance of Concrete Bridge Decks
… hammer testing, half-cell potential testing, and chloride concentration testing. Because differences in deck age and average cover for the two deck types were found to be statistically significant, the collected data were subjected to analysis of covariance (ANOCOVA) testing, with age and cover as …
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The effect of dehydration and rehydration on physiology parameters associated with maximal rowing performance
… drinking water and solutions of varying sodium chloride concentration in restoring plasma volume after dehydration; and secondly, the metabolic processes during performance in a maximal rowing trial following partial rehydration with water after rapid weight loss.
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Development of measurement techniques for evaluation of inhibitors for controlling rebar corrosion in concrete
… alternate complete immersion in a 6 wt% sodium chloride solution, plus eventual addition of corrosion inhibitor, for 3 days and 12 hours of drying at 110°F. The effects of corrosion inhibitors were evaluated using half-cell potential measurements and Electrochemical Impedance Spectroscopy (EIS) …
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Local Environment in Pitting Corrosion of Aluminum
The pH and chloride microsensors were used to study propagation and repassivation of pits on pure aluminum in pH 11 NaCl solution. It was concluded that the pH inside a growing pit was around 2.7, and the chloride concentration was higher than the saturation concentration. After current to the pit …
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Spatial and Temporal Influences of Water Quality on Zooplankton in Lake Texoma
… five lake zones delineated a priori based on chloride concentration. The zones, in order of decreasing chloride concentration, are the Red River zone (RRZ), Red river Transition zone (RRTZ), Main Lake zone (MLZ), Washita River Transition zone (WRTZ) and Washita River zone (WRZ). Bray Curtis …
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Grain boundary self-diffusion in sodium chloride
… and twist grain boundaries in pure and calcium chloride doped sodium chloride bicrystals was investigated. No enhanced diffusion of ²²sodium along the grain boundaries was observed. Between 400°C and 500°C the chlorine grain boundary diffusion parameter, D'Δ, is described by D'Δ = (D'Δ)₀exp …
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Spatial and temporal patterns exhibited by select physicochemical and biological water quality parameters in Lake Texoma, Oklahoma and Texas.
… as related to U.S. Army Corps of Engineers chloride control activities in the upper Wichita River, Texas. Five reservoir zones were identified a priori using historical chloride concentration data and include the Red River Zone (RRZ), Red River Transition Zone (RRTZ), Main Lake Body (MLB), …
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Effect of Initial Surface Treatment Timing on Chloride Concentrations in Concrete Bridge Decks
… on concrete bridge decks as barriers against chloride ingress. In consideration of concrete cover thickness and the presence of stay-in-place metal forms (SIPMFs), the objective of this research was to determine the latest timing of initial surface treatment applications on concrete bridge …
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Corrosion Testing and Modeling of Chloride-Induced Corrosion Deterioration of Concrete Bridge Decks
Modeling of chloride-induced deterioration of bridge decks by using Fick's Second Law of diffusion was performed. The objective of this study is to select suitable input parameters for the model to estimate the service life of bridge decks. Five bridge decks, one in each of the following states, …
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Corrosion of reinforcement in concrete : the effectiveness of organic corrosion inhibitors
… caused short to medium term inhibition when the chloride concentration was less than 1.5%.
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Comsol Modelling of Uniform Corrosion of Used Nuclear Fuel Canisters
… oxidation, and parameters including oxygen concentration, chloride, moisture and associated rate constants. In this work, CCM has been incorporated in COMSOL and validated with CCM. Once validated, the COMSOL model was used to examine the sensitivity of various parameters with respect to …
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Electrodisinfection of Municipal Wastewater Effluent
… the effects of electrical current, time, and chloride concentration on the electrochemical disinfection of sewage treatment plant effluent using aluminum electrodes to substitute for chlorine disinfection.
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The development of appropriate brine electrolysers for disinfection of rural water supplies
… materials for the electrolysis of brine (sodium chloride) for the production of sodium hypochlorite as a source of available chlorine for disinfection of rural water supplies has been undertaken. The electrolyser design used was tubular in form, having two chambers i.e. anode inside and cathode …
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Cloning and characterization of neuraminidase from Salmonella typhimurium LT-2 and its relationship to neuraminidase from other bacteria
… NANase activity is maximal at a sodium chloride concentration of approximately 100 mM and is not altered in the presence of increasing ionic strength. K$\sb{\rm m}$ and V$\sb{\rm max}$ values for the synthetic substrate 4-methylumbelliferyl-NeuNAc are 0.24 mM and 5200 nmol/min, …
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A comparison of uncertainty analysis methods for the modeling of land disposal of petroleum exploration and production waste
… and accuracy for evaluation of contaminant concentration at a down-gradient receptor. Benzene and chloride, two contaminants most commonly found in petroleum exploration and production waste, were analyzed for two waste disposal scenarios, i.e. (1) closed waste pit, and (2) landspreading. …
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Spectroscopic Investigation of Cement Hydrate Phases and Their Chloride Binding Properties
The chloride binding capacity depends on the structure and surface properties of the individual hydrates. Portlandite and AFm surfaces have high affinity for chloride due to their positive zeta-potentials. For C-S-H samples, the chloride binding capacity increases with increasing C/S ratio due to …
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