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 396 for “"thermogravimetric"”.
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A thermogravimetric study of oxygen diffusion in YBa2Cu3O7-d
… are very scattered. This thesis presents a thermogravimetric study of oxygen diffusion in YBCO under isothermal and non-isothermal conditions and tries to reconcile the data available based on the results obtained and taking into account the factors that may have affected the data presented …
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A Thermogravimetric Study of the Pyrolytic Behaviour of South Wales Coals
… also revealed that a computer interfaced to the thermogravimetric apparatus to collect and manipulate data would aid the research. An extra aim of the research was added: to interface a Model B BBC Microcomputer to the apparatus and to develop the necessary programs. This aim was successfully …
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Thermogravimetric, thermopower, and electrical conductivity studies of the Ba₂YCu₃O₇₋ₓ system
… system was investigated using thermogravimetric, thermopower, and d.c. electrical conductivity techniques. The system was found to exhibit a semiconductor to metallic transition coincident with the documented orthorhombic to tetragonal phase transition. Conduction is …
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Investigation of Spontaneous Combustion Inhibition of Coal Fires Utilizing Differential Scanning Calorimetry and Thermogravimetric Analysis
… formulation. Multiple approaches including thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) were used to analyze these effects. Results showed these novel formulations can reduce spontaneous combustion potential, making coal more thermally stable. Mechanisms by …
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Development and Implementation of a Standard Methodology for Respirable Coal Mine Dust Characterization with Thermogravimetric Analysis
… for characterization of respirable dust via thermogravimetric analysis (TGA). This method was verified with laboratory-generated respirable dust samples analogous to those commonly observed in underground coal mines. Results of this study demonstrate the ability of the novel TGA method to …
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An Improved Thermogravimetric Analysis Method for Respirable Coal Mine Dust and Comparison to Results by SEM-EDX
… research group established a preliminary thermogravimetric analysis (TGA) method for coal mine dust. The method is intended to allow estimation of three key mass fractions of the dust from separate sources: coal from the coal strata being mined; non-carbonate minerals from the rock strata …
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Vapor Pressures and Thermodynamic Properties of Mg(BH4)2, KBH4 and RbBH4 Using Torsion-Effusion and Thermogravimetric Method
… KBH4 and RbBH4 using the torsion-effusion thermogravimetric method. Thermodynamic constants for KBH4 and RbBH4 have been obtained with very little uncertainty and are therefore reliable. This data will be tabulated on thermodynamic constants tables.
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Use of ultrasonication, thermogravimetric analysis and newly developed hot-air drying platform for evaluation and optimization of drying processes of agricultural materials
… ultrasound pretreatment was shown to reduce the thermogravimetric analyzer (TGA) drying time by up to 22%, yielding products with lower equilibrium moisture content (which can improve shelf-life), and increasing the hydration rate and equilibrium moisture content of hydrated grains. The second …
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A study of liquid clathrates
… by various chemical methods including: thermogravimetric analysis, differential thermal analysis and proton nuclear magnetic resonance spectroscopy.
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Physicochemical study of inclusion of drug molecules in cyclodextrins
… spectrophotometry, elemental analysis and thermogravimetric analysis were the principal techniques used for determination of composition. Hot stage microscopy, differential scanning calorimetry and thermogravimetric analysis were the principal techniques used for the analysis of thermal …
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Porous Materials Prepared by Ultrasonic Spray Pyrolysis
… differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) suggests that the decomposition behavior of each precursor is responsible for the observed morphology differences. These carbon materials often have high surface areas and are thermally stable, making them …
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The search for new materials for high-temperature carbon capture and storage
… candidates were synthesised and subjected to thermogravimetric and diffraction studies to determine their experimental carbonation behaviour, showing good agreement with the screening results. The second part describes a study of the rst perovskite-type material shown to reversibly react with …
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Síntese e caracterização de um novo agente sililante - imobilização na sílica gel em meio aquoso.
… CHNS, infrared spectroscopy, NMR 13C and 29Si, thermogravimetric analysis and surface area. The surface area were 0.43 m2g-1 and 193 for solids AMPTGA and Sil-AMPTGA, respectively, which were lower than that of silica gel precursor 484 m2g-1. The thermogravimetric analysis showed four mass …
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Assessment of residual composite properties as influenced by thermal mechanical aging
… changes were observed in the DSC scans. Dynamic thermogravimetric analysis (TGA) tests were used to compare weight loss rate versus temperature results for the different age materials. Results show different rates of degradation occurring in the different K3B polymer aging histories. In addition …
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Analysis of U-Zr-C-O Quaternary System for Applications in Advanced ZRC Coated Triso Particles
… powders are created and used for in-vacuo thermogravimetric testing with both carbon and zirconium carbide powders to evaluate the efficiency of ZrC for usage as an oxygen getter in oxide TRISO fuels.</p>
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Chemically activated carbon using peat soil for heavy metals adsorption in industrial wastewater
… the complete degradation of organic matter. The thermogravimetric analysis (TGA) and its derivative thermogravimetric (DTG) confirm the finding where at temperature ≈400°C, peat undergo complete degradation of matter. The heating temperature was set to constant at 400°C for activation process. …
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Selective criteria in Werner clathrates
… of the compounds were analysed by thermogravimetric analysis and differen.tial thermal analysis. The structures of two related compounds [Ni(NCS)2(Py)4] and [Ni(NCS)2(Py)4].nbenzene were also studied.
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Physicochemical studies of the inclusion of selected agrochemicals in cyclodextrins
… inclusion complexes were evaluated using thermogravimetric analysis.
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