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 39 for “"water solutions"”.
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Redesign and recalibration of a bubble-cap column used in the fractionation of isopropanol-water solutions
… simple binary mixtures of isopropyl alcohol and water, to recalibrate all measuring devices used in the operation of the column, to develop an analytical method by which the composition of liquid samples from the column could be determined accurately and quickly, and, in general, to place the …
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The measurement of the diffusion coefficient of water in poly (ethylene oxide) water solutions using a nuclear magnetic resonance pulsed field gradient technique
… often been used in studies of the interaction of water molecules with complex macromolecular structures such as proteins and polymers. We have measured the diffusion coefficient of protons in water/poly (ethylene oxide) solutions as a function of concentration using a pulsed field gradient NMR …
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Measured Electron Spin Relaxation Rates in Frozen Solutions of Azurin, Vitamin-B12r, and Nitrosyl Ferrous Myoglobin
Rates in frozen glycerin/water solutions at temperatures between 1.4 K and 20 K are reported for a copper-containing protein, azurin, and a cobalt-containing biomolecular complex, vitamin B$\sb{\rm 12r}$, the paramagnetic product of the photolysis of coenzyme B$\sb $. Results are interpreted in …
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A study of the practicability of the photometer method in making soil loss measurements
… measuring light absorption by turbid soil and water solutions when the soil particles are of nearly constant size. The tests made with the soil that had passed through a 100-mess sieve proved this fact, also, the tests made with the composite soil gave vary accurate results. (2) the composite …
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AMPHOTERIC POLYAMIDOAMINES AS FUNCTIONAL SPECIALTY POLYMERS
… the potential environmental impact of amphoteric water-soluble PAAs, which may accidentally be released into ecosystems during or after their useful life. The ecotoxicity of PAAs was evaluated on the early stages of plant development using Lepidium sativum (watercress) seeds. In this study, the …
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Manufacture and rehabilitation of guard-rail posts using composites for superior performance
… freeze-thaw chemical aging (in acidic, alkaline, water and salt water solutions). The retention in mechanical properties was measured using flexure tests and DMTA. The performance in terms of modulus and rigidity was reduced the most by acidic medium, and the least by saltwater medium. It was …
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Taking Magnetic Resonance into Industrial Applications
… of model power-law fluids, namely xanthan gum-in-water solutions, accurate to within 5% of conventional rheometry, the data being acquired in only 6% of the time required when using MR flow imaging. The second approach utilises a Bayesian analysis of the PFG MR signal to characterise the rheology …
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Rheological characterization and modeling of Laponite gels with application to snug-like locomotion
… 2.5%, 3%, and 4% wt. of Laponite and distilled water solutions were tested. Laponite gels over 1% wt. concentrations were characterized as yield stress materials, as determined by stress sweep, creep test, and LAOS tests. The stress sweeps determined the yield stress, and the creep tests …
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PV-powered membrane system control for continuous autonomous water solution in remote areas
… (PV-membrane) systems used for water purification. These fluctuations lead to reduced permeate volume and quality, as well as increased specific energy consumption. The primary aim of this research is to incorporate mechanical energy storage and develop a hydraulic buffering …
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Calculation of the effective atomic number for the iodine contrast agent of the varying concentrations
… phantom and the phantom containing the iohexol solutions of varying concentrations on the original CT system assembled by the author. A method of the effective atomic number mapping is discussed as a viable alternative to the traditional attenuation-based tomography. The dependency of the …
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An experimental apparatus for the measurement of sorption isotherms of moisture in porous building materials
… associated with the use of saturated salt-in-water solutions. Moisture content is determined gravimetrically without removing specimens from their conditioned environment. The mass is monitored in situ such that external ambient conditions have no effect on the data. The control of test …
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The separation of ionic and organic mercury from water using milk proteins, xanthates and keratin
… monomethyl mercury and dimethyl mercury from water solutions with milk proteins, xanthates, and structural proteins have been investigated. Milk proteins, including lactalbumin, casein, whey and whole milk were tested in concentrations of one part protein per 500 parts water. Once filtered, …
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Síntesis y Caracterización de Complejos de Paladio (II) con Ligandos (2-difenilfosfanil-benciliden)-anilina : Investigación y Desarrollo de un Sistema para Almacenamiento de Hidrógeno
… of catalysts for the hydrogen production from water solutions of NaBH4. This solutions are a system for storage and production hydrogen on board of a vehicle, as well as a sure method for the liberation of hydrogen of a controllable way, and an alternative in the system use of solid storage.
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Geochemical drivers of Mn removal in drinking water reservoirs under hypolimnetic oxygenation
… experiments and field monitoring at two drinking water reservoirs in southwestern Virginia – Falling Creek Reservoir (FCR) and Carvins Cove Reservoir (CCR). In laboratory experiments in pH and alkalinity-adjusted nanopure water solutions, we observed substantial Mn removal within 14 days only …
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A geochemical analysis of municipal solid waste ash
… 18% minerals, 9% structural and adsorbed water, and 72% glass. Chemical sequential extraction showed that most Cr is present in phases resistant to chemical weathering, while significant Cd and Pb are sequestered in acid soluble (carbonate) phases. Little of these toxic trace metals are …
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Synthesis of Functionalized Poly(dimethylsiloxane)s and the Preparation of Magnetite Nanoparticle Complexes and Dispersions
… prepared by crystallization from goethite/glycol/water solutions under pressure. Two methods for particle growth were investigated in which the crystallization medium was varied by adjusting the amount of water or by adding itaconic acid. Particle surfaces were analyzed by x-ray photoelectron …
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Picosecond Infrared Lasers (PIRL): Applications in Biodiagnostics and Towards Quantitative Mass Spectrometry
… (PIRL) has been introduced to selectively excite water to directly drive ablation of biological tissue faster than any competing energy dissipation process that could damage surrounding tissue. This thesis work showed that this mechanism can be exploited for a new form of spatially resolved mass …
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The remediation of tributyltin-contaminated dredgins and waters
… for the simultaneous analysis of multiple water samples, based on in situ extraction and derivatisation on C18 solid phase extraction cartridges. No legislative limits existed for TBT in leachates, therefore the detection limits of ca 6-10 ng Sn/L achieved were regarded satisfactory, as …
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