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Showing 1 to 20 of 1420 for “"Carbonate"”.
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Catalytic Conversion of Glycerol to Glycerol Carbonate Utilizing CO₂ and Dimethyl Carbonate
… conversion of glycerol to value-added glycerol carbonate using CO2, an abundant, non-toxic greenhouse gas, and dimethyl carbonate (DMC), which yields more glycerol carbonate. The catalysts were prepared by co-precipitation method, and characterized by using XPS, FT-IR, XRD, TGA, SEM, and CO2-TPD …
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Calcium carbonate precipitation kinetics
A modified equation from that of Nancollas and Reddy is presented to describe the rate of calcium removed from water in CacO3; precipitation. The mass of CaCO3; precipitated at any moment was obtained by monitoring pH and utilizing this in the equilibrium equations for the Ca - H2CO3 system …
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Carbonate Ions and Gastric Cancer
… ingestion of food supplemented with calcium carbonate more than tripled the incidence of carcinomas (61%) compared to controls (17%). In a second set of experiments, calcium ions were switched to sodium ions, which revealed that carbonate ions caused the remarkable increase in cancer in the …
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Simulating complex conductivity in carbonate rocks: using digital carbonate rocks and comparison to laboratory measurements
… is the simulation of the complex conductivity of carbonate reservoir rocks using reconstructed 3D rock structures from high-resolution X-ray micro computed tomography (micro-CT). Carbonate core samples with varying lithofacies and pore structures from the Cambro-Ordovician Arbuckle Group and the …
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Sulfate in foraminiferal calcium carbonate : investigating a potential proxy for sea water carbonate ion concentration
… for measuring sulfur in foraminiferal calcium carbonate was developed, employing a high-resolution inductively coupled plasma-mass spectrometer. The sulfur measurements, expressed as sulfur-to-calcium (S/Ca) ratios in the foraminiferal shells, ranged from 0.26 to 6.0 mmol/mol. Most analyses …
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Investigating the redispersibility of calcium carbonate
The primary aim of this research was to investigate the redispersibility of the commercial calcite slurry product, Carbilux, after drying. Various dispersants and pH changes were made to improve the colloidal stability. The commercial product contained an unknown organic dispersant which was …
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Diffusion of Zinc Through Carbonate Systems
Made available in DSpace on 2014-12-04T19:13:33Z (GMT). No. of bitstreams: 1 0016436.pdf: 3814208 bytes, checksum: f5b8a4bb4690e75c515c1ffdc0c5a9e9 (MD5) Previous issue date: 1956
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Carbonate chemistry in high salinity waters
… to develop phase equilibrium diagrams for the carbonate system in high salinity waters, i.e. for single aqueous phase, solid-aqueous phase, gasaqueous phase and solid-aqueous-gas phases. Such diagrams have been developed for low salinity waters, viz. Deffeyes and Caldwell-Lawrence diagrams and …
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Surface properties of poly(bisphenol-A-carbonate)
… the problems of injection moulded polycarbonate. <br></br><br></br>Grooves inscribed in an amorphous polymer surface change in dimensions on thermal annealing, and this change observed by interferometry forms the basis of the surface free energy measurement technique. Stringent …
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Chert Nodules in Carbonate Rocks of Illinois
Made available in DSpace on 2014-12-04T19:13:36Z (GMT). No. of bitstreams: 1 0025194.pdf: 3940680 bytes, checksum: 1b309db6cf4ec8d5efa889ca7fd22998 (MD5) Previous issue date: 1957
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Adsorption to and Dissolution of Carbonate Minerals
[Restricted]
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Barium carbonate treatment of sulfuric acid wastewater
… acid wastewater through the addition of barium carbonate and the formation of a barium sulfate precipitant were investigated. Optimization of barium carbonate dosage, reaction time and mixing conditions was accomplished for each method prior to evaluating the treatability of the reaction …
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Facies, paleogeography, and the carbonate precipitation on the archean (2520 Ma) Campbellrand-Malmani carbonate platform, Transvaal supergroup, South Africa
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1995.
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Quaternary morphology and paleoenvironmental records of carbonate islands
… to show that the presentday morphology of carbonate islands has developed largely in response to late Pleistocene sea level oscillations in addition to variable vertical motion and reef accretion rates. In particular, large amplitude ‘ice-house’ sea-level variability resulted in long …
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Potential of Cyanobacterial Carbonate Precipitation for Concrete Restoration
… healing cracks and recycling concrete, microbial carbonate precipitation (MCP) by nitrogen-involved heterotrophic bacteria showed great potential. In this study, an alternative technology using autophototrophic cyanobacteria is proposed to overcome the pollution generated by urea-based MCP. This …
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Thermodynamic analysis of molten carbonate fuel cell systems
… with the thermodynamic analysis of a molten carbonate fuel cell (MCFC) hybrid system to determine its efficiencies, irreversibilities and performance.The analysis includes a performance investigation of a typical molten carbonate fuel cell stack, an industrial MCFC hybrid system, and an MCFC …
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