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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 98 for “"Gravimetric analysis"”.
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Particle Matter Measurements for Inspection/Maintenance Programs
… are currently measured by opacity or dynamometer gravimetric analysis. The Electronic Tailpipe Particle Sensor (ETaPS) is an inexpensive measurement device purported to give real time response to particle mass and was proposed as a possible addition to Inspection/Maintenance (I/M) programs. There …
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Assessment of Ambient Air Particulate Matter in the New Orleans Historic District
… less than 2.5 micron in size) were quantified by gravimetric analysis using an Andersen Dichotomous Sampler (Series 240). Posterior to gravimetric analysis, the filters were analyzed with a fluorescent test method using an Innov-X Portable XRF Analyzer (Model A-6500). This study demonstrated that …
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Synthesis and Characterization of Novel Adsorbent Fibers
… This system was characterized through elemental analysis (EA), diffuse reflectance infrared fourier transform spectroscopy, thermal gravimetric analysis, and nitrogen/carbon dioxide adsorption. Their performance as efficient ion exchange systems was evaluated through pressure drop, capacity and …
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One-Dimensional nanostructured polymeric materials for solar cell applications
… (UV-Vis), photoluminescence(PL), thermal gravimetric analysis (TGA) and cyclic voltammetry (CV) experiments. Devices fabricated from these materials were characterized under simulated AM 1.5 at 800 mW.
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Computational and adsorption investigation of some quinoxaline derivatives on selected metals in acidic media
… behavior were analyzed using gravimetric analysis, electrochemical impedance spectroscopy (EIS), and potentiodynamic polarization (PDP). Fourier transform infrared spectroscopy (FTIR) was utilized to give more insight into the functional groups that formed or disappeared during …
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Test Development and Material Characterization of Hot Poured Crack Sealant at Low Temperature
… infrared spectroscopy (FTIR), and thermo-gravimetric analysis (TGA). These techniques reveal the composition of sealant as well as the interaction between the components and are used to assist the understanding of various sealant mechanical behaviors. The results of the microstructure …
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Carbon Dioxide Capture With Amine Functionlized Graphene Oxide
… (ftir) for chemical structure. Thermal gravimetric analysis (tga) was used to test co2 capture capacity. Functionalized graphene oxide that has been purified with 30 washes via centrifuge with 72 hour amine functionalization method time had greatest co2 capture potential with 1.38% …
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Controlled multi-step purification of single-walled carbon nanotubes
… quality of each sample were determined by thermo-gravimetric analysis (TGA), Raman spectrometry, ultraviolet-visible-near-IR (UV-vis-near-IR) spectrometry, fluorescence spectrometry and transmission electron microscope (TEM) spectroscopy. The purity and yield of SWNT are improved due to reduced …
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Polydimethylsiloxane Containing Block Copolymers: Synthesis and Characterization of Alternating Poly(Arylene Ether Phosphine Oxide)-B-Siloxane and Segmented Nylon 6,6 -B-Siloxane Copolymers
… and good mechanical strength. Thermal gravimetric analysis showed high thermo-oxidative stability and increasing char yield with increasing siloxane content. Additional thermal and mechanical investigations provided evidence of selective phase mixing, particularly at shorter block …
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Crystal Engineering of Flavonoids
… powder X-ray diffraction, TGA (Thermal Gravimetric Analysis) and melting point. The new compounds were also studied via dissolution studies performed in 1:1 ethanol/water (V/V%). Thus, crystal engineering proves to be effective way to enhance the solubility and bioavailability of the …
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Catalytic Role of Boron Nitride in the Thermal Decomposition of Ammonium Perchlorate
… The decomposition reaction is studied by thermo-gravimetric analysis / differential scanning calorimetry, X-ray photoelectron spectroscopy, fourier transform infrared spectroscopy, transmission electron microscopy and scanning electron microscopy. The goal of this study is to discover the …
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Produção de grês porcelanato a partir de matérias-primas do estado da Bahia
… fluorescence, X-ray diffraction, particle size analysis, thermal gravimetric analysis, thermal differential analysis and dilatometric analysis. Admixtures containing different compositions were prepared and fired at four temperatures, 1100 ºC, 1150 ºC, 1200 ºC and 1250 ºC with isotherm for 60 …
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Nanoscale magnesium as a hydrogen storage material
… were studied mainly using thermo-volumetric and gravimetric analysis. The hydrogenation of the samples was confirmed using XRD. Sorption enthalpies of the films were calculated through van’t Hoff plots and were found to be quite high. However, the 40 layer Mg/Ti sample displayed the lowest …
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A comparison of conventional heating techniques and microwave irradiation for the desorption of lithium borohydride and lithium borohydride composites
… roller and planetary mill techniques. Thermo-gravimetric analysis and differential scanning calorimetry determined the desorption characteristics of the as received and milled materials. Scanning electron microscopy was used to examine the particle size of the materials before heating. A …
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SURFACE AREA AS A METHOD FOR THE DETERMINATION OF GLOVE DEGRADATION
… study provides an inexpensive alternative to gravimetric analysis. This method uses surface area change as a way to determine the degradation of a polymer material. The percent change data were compared between the weight change and the surface area change. The regression line given was …
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A thermally stabilized fluorescent organic chromophore
… differential scanning calorimetry, thermal gravimetric analysis, scanning electron microscopy, and energy-dispersive X-ray spectroscopy. The thermal stability of the dye was improved from a significant level of decomposition by 200 °C to nearly no loss of mass at 350 °C. It proved impossible …
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An Evaluation of the Durability of Polymer Concrete Bonds to Aluminum Bridge Decks
… (silica aggregates/epoxy bond) as well. Fracture analysis and finite element modeling were completed for linear elastic behavior. Analytical and numerical solutions were in reasonably good agreement. Characterization of the bridge components and failure specimens were accomplished using analytical …
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Studio sui calamari Loligo vulgaris (Lamarck, 1798) e Loligo forbesii (Steenstrup, 1856) delle acque della Sardegna
… process through macroscopic histological and gravimetric analysis of the reproductive systems showed similarities between the two squids both in morphology of the gonads and in the pattern of reproduction. They are similar because they show an extended period of sexual maturity; they have an …
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Smectite to illite transformation of Gulf of Mexico -Eugene Island (GoM-EI) mudrock
… to a final discrete illite. Additional thermal gravimetric analysis (TGA) study on cooked samples confirms that the transformation is releasing water. However, we are unable to determine the volume change of the sample using mineral study.
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The influence of pheromone dispenser release rates, trap height and pheromone dispenser height on captures of leafrollers in Virginia apple orchards
Gravimetric analysis was used to determine the release rates and longevities of several designs of pheromone dispensers for mating disruption of leafrollers and codling moth, Cydia pomonella (Linneaus). Release rates were described by linear equations for at least four months, but by the end of the …
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