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.
Results
Showing 1 to 20 of 305 for “"EDX"”.
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Development and Implementation of an Automated SEM-EDX Routine for Characterizing Respirable Coal Mine Dust
… microscopy with energy dispersive x-ray (SEM-EDX). SEM-EDX is a powerful tool that allows determination of the size, shape, and chemistry of individual particles, but manual operation of the instrument is very time consuming and has the potential to introduce user bias. The automated method …
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Development and Demonstration of a Standard Methodology for Respirable Coal Mine Dust Characterization Using SEM-EDX
… microscopy with energy dispersive x-ray (SEM-EDX). In addition to a thorough description of the developed particle level characterization approach, the method is demonstrated with underground respirable dust samples collected from an underground coal mine in Central Appalachia. Results of this …
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An Improved Thermogravimetric Analysis Method for Respirable Coal Mine Dust and Comparison to Results by SEM-EDX
… microscopy using energy dispersive X-ray (SEM-EDX). TGA and SEM-EDX results are compared to gain insights regarding the analytical methods and general trends in dust composition within and between mines.
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Investigating the Effects of Particle Loading and Agglomeration on Respirable Coal Mine Dust Particle Classification by SEM-EDX
… with energy dispersive X-ray spectroscopy (SEM-EDX) is a powerful tool that can analyze RCMD on a particle-level. The images produced by the SEM can size and characterize morphology of micron and submicron-sized particles. In addition, the EDX can determine elemental content, which can be used …
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Chemical Differentiation of Human Osseous, Non-human Osseous, and Non-osseous Materials Using Scanning Electron Microscopy - Energy Dispersive X-ray Spectrometry (SEM/EDX) and Multivariate Statistical Analysis
… and colleagues (2002) proposed using SEM/EDX to achieve this distinction and Christensen and colleagues (2012) have validated X-ray Fluorescence Spectrometry (XRF) for this application. An alternative method of analysis involves performing principal component analysis (PCA) on element …
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A Multi-instrument Investigation of Pigments, Binders and Varnishes from Egyptian Paintings (AD 1300-1900): Molecular and Elemental Analysis Using Raman, GC-MS and SEM-EDX Techniques
The focus of this study was analytical investigations of Egyptian paintings, mainly Coptic icons and Islamic wooden ceilings, dating from 1300-1900 using multiinstrumental techniques. Twenty three Coptic icons and three wooden ceilings dated from different periods and painted by different painters …
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Impact of Covid-19 Pandemic on Student Participation in an Intro CS MOOC
… the MOOC (Massive Open Online Course) platform edX: a platform that enables students around the world to engage in academia through an online, virtual environment. In efforts to analyze the impacts of the pandemic, this thesis will provide a data-driven survey of the landscape of the …
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Understanding learner engagement and the effect of course structure in massive open online courses
… thesis, we analyze learner performance in two edX programming courses. We look at many dierent types of learners, such as learners who have taken both intro and advanced courses, learners who opt to pay for certification, learners who take the experimental self-paced course, learners who …
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Explaining Concepts through Labs that Present Real-World Scenarios in an Introductory Computer Science MOOC
… Open Courses (MOOCs) such as those hosted on edX have the ability to reach thousands of students all over the world. Typically, they consist of a combination of lectures, graded assignments, and tests and are generally less interactive than the typical in person course. We believe that the …
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Model systems for the study of active phase evolution in complex bimetallic catalysts (PdZn)
… including XRD, Raman Spectroscopy, XPS, EDX along with TEM and STEM were used to gain valuable insight into the nature of the samples used in these studies. Investigations into the Pd:Zn aerosol derived oxides demonstrated the existence of 2 mixed oxides, a previously undocumented …
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Investigation of electrophoretic deposition as a fabrication technique for high performance composites
… microscope (SEM) and energetic dispersive x-ray (EDX)/Auger spectrometers to visualize coating quality and penetration of the material into the substrate. Limitations of EDX/Auger spectroscopy are briefly discussed with respect to the analysis of boron carbide. After the first set of experiments …
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High Temperature Corrosion of Single Crystal Sapphire and Zirconia in Coal Gasification and Commercial Glass Environments
… and zirconia were investigated using SEM and EDX analysis. The experimental measurements as well as SEM micrographs show very little or no degradation of sapphire and zirconia samples in corrosive slags. An interesting phenomenon was observed in the EDX scans of sapphire in the coal slag: the …
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The nanostructure and degradation of C-S-H in Portland and blended cements
… the C-S-H present in the systems analysed by TEM-EDX. SEM micrographs showed that as hydration occurred, the microstructure became denser because outer product C-S-H was formed in the water filled spaces and additional C-S-H resulted from the pozzolanic reaction. The chemical composition of C-S-H …
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Electron Microscopy Studies of Hybrid Perovskite Solar Cells
… compounds building up the cell. STEM-EDX (Scanning Transmission Electron Microscopy - Energy Dispersive X-ray spectroscopy) was employed to resolve at the nanoscale the morphology and the elemental composition of the devices. Firstly, a powerful procedure, involving FIB (Focus Ion …
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Challenges in creating online courses and establishing a measure of their efficacy with an example of MIT's course in Sustainable Energy
… behaviors, and our experimentation with the edX Platform. This end goal of this report is to create a template to help instructors and designers in creating an online course on the edX platform.
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Depozice tenkých polymerních vrstev v povrchovém DBD výboji
… pomocí skenovací elektronové mikroskopie s EDX (Energy-Dispersive Xray Spectroscopy) detektorem a jejich povrchová energie pomocí metody měření kontaktních úhlů.
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Efekt uhlíku v biodegradabilních materiálech na bázi železa
… vodivosti, Tafelova extrapolácia, SEM a EDX. V praktickej časti bol najskôr podľa metodiky Kokuba a Takadamu pripravený roztok simulovanej telesnej tekutiny a následne metódami práškovej metalurgie boli zhotovené štyri typy vzoriek zloženia 18 g Fe - 2 g Mg – 0,5 g C a 18 g Fe – 2 g Mg – …
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Methods for observational studies using data from massive open online courses
… the course. This method is applied to an edX course, 6.002x, to estimate the effect of attempting homework and other assessments on students' final exam performance.
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Green approach to treat institutional wastewater by using cassava peels starch (CPS) as coagulant aid
… Characteristics of CPS were characterized by SEM-EDX, FTIR, XRF, XRD, particle size and zeta potential. Removal efficiency of dual coagulant (alum+CPS) were achieved at optimum dosage of 40:60 mg/L at pH 8 with 60 mins settling time with removal efficiency of COD (41%), TSS (86%) and Turbidity …
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Mineral-Surface Chemistry of Hydroxyapatite and Urea-Rich Solutions
… (SEM), energy-dispersive x-ray spectroscopy (EDX), and PM-IRRAS before and after reaction. Phosphate depletion was observed with PM-IRRAS and was supported by more established instrumentation including nuclear magnetic resonance spectroscopy (NMR) and energy dispersive x-ray spectroscopy …
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