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 51 for “"Particle Mass"”.
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An absolute method for aerosol particle mass measurement
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1982.
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Understanding the chemistry of atmospheric particles using single particle mass spectrometry
This thesis explores ways in which single particle mass spectrometry can be extended, whether through hardware improvements, or through the use of advanced data processing techniques to provide new kinds of aerosol chemistry measurements. Most of this work has been carried out using the Particle …
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A machine-learning approach to aerosol classification for single-particle mass spectrometry
… aerosols is often conducted via single-particle mass spectrometry (SPMS), an in situ and real-time analytical technique that produces mass spectra on a single particle basis. In this study, machine learning classification algorithms are created using a dataset of SPMS spectra to …
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The Enhancement of Convective Heat Transfer in an Aluminum Oxide Nanoaerosol
… 112 nm diameter aluminum oxide (Al2O3) nanoparticles in air on the rate of convective heat transfer. The particle mass loading was varied over a range of flow Reynolds number. The results indicate up to a 36% increase in Nusselt number for a particle mass loading of 0.35% at a Reynolds …
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Design and prototyping of a test facility to investigate the transport properties of dilute phase gas-particle flows applicable to coal-fired power plants
Understanding the properties of dilute phase gas-particle transport and the applicability of the different empirical correlations found in literature for these properties are crucial in the study of Pulverized Fuel conveying applicable to South African coal-fired power plants. Having access to a …
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Scaling and Performance of a Device for Fluidized Bed Entrainment Reduction
… from a fluidized bed has been studied. Particles projected upward at the bed surface entered a particle diverter which returned them to the bed. Relations were proposed for scaling the particle mass flux field above the device. Experimental studies were done on two geometrically similar …
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Particle Matter Measurements for Inspection/Maintenance Programs
<p>Particle emissions from Heavy Duty Diesel Vehicles (HDDVs) 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 …
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An experimental study of the flow boiling of refrigerant-based nanofluids
… and R134a used as the base refrigerants. CuO nanoparticles 40nm in size, and TiO2 nanoparticles 200nm in size are used to create partially stable CO2-based nanofluids. Stable nanofluids are created in R134a by mixing it with dispersions of surface-treated nanoparticles in polyolester (POE) oil …
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Evaluation of a Particle Sampling Probe to Measure Mass Concentration in Particle-Laden Flows
Particle ingestion is a prevalent issue for jet engines. During operation, sand and ash particles enter the engine and can cause serious problems, including erosion and buildup of Calcia-Magnesia-Alumina-Silicate (CMAS) deposits. Analyzing the particle mass concentration of the airflow can help …
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Particle Capture by Evaporating Cloud Drops
… drops (56-93 (mu)m radius) with solid spheroidal particles of manganese hypophosphite (0.58-3.2 (mu)m radius) and near 90% relative humidity for drops (60-92 (mu)m radius) with hollow shells of lithium carbonate (2 (mu)m radius). In each experimental run a large number of widely space uniform form …
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The application of low-cost sensors to monitor and characterise particulate matter air pollution
… networks have been established to record particle mass concentrations under fixed conditions. However, monitoring sites are sparsely distributed due to the expense, size and calibration requirements of regulatory-grade instruments. Very limited information is available on the particle …
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Particle Charging and Classification: The Mass Mobility Aerosol Spectrometer (M2AS)
… Many aerosol quantification methods rely on particle charging and classification techniques, where particles are charged and classified based on their electrical mobility or mass-to-charge ratio. Diffusion charging is commonly used to impart a known charge to particles, enabling precise …
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Numerical models of Hall thruster ionization oscillations
… discharge current oscillations is analyzed using particle-in-cell simulation, and a series of parametric simulations is used to determine the effects of macro-particle size, floating body potential, electron injection region, ion time step size, grid refinement, heavy particle mass reduction, and …
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The Effects of Particles Momentum Transfer in Shock Wave/Boundary Layer Interaction
Numerical simulations of solid particles seeded into a supersonic flow containing an oblique shockwave reflection were performed in order to observe and understand the momentum transfer effects between solid and gas phases in shock-wave / boundary layer interaction. Particle size and mass loading …
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Search for boosted Higgs boson decays to a pair of spin-0 particle in the 4b final state.
… as well as the training and assessment of ParticleNet mass decorrelated regressors, then outlines their usage in the search for boosted Higgs boson decays to a pair of spin-0 particles in the b¯bb¯b final state using CMS Run 2 data. The spin-0 particle mass examined in this analysis ranged …
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ΜΟΝΙΜΗ ΚΑΤΑΣΤΑΣΗ ΛΕΙΤΟΥΡΓΙΑΣ ΟΞΕΙΔΩΤΙΚΗΣ ΠΑΓΙΔΑΣ ΣΩΜΑΤΙΔΙΩΝ ΚΑΥΣΑΕΡΙΟΥ ΚΙΝΗΤΗΡΩΝ DIESEL
… THAT THE PORE SIZE OF THE TRAP COMBINED WITH THE PARTICLE SIZE DISTRIBUTION RESULTING FROM THE TRAP OXIDISING ACTIVITY DEFINES TWO AREAS OF TRAP OPERATION: (I) ACCUMULATION WHEN NO PASS THROUGH IS PERMITTED. THE MATHEMATICAL EVALUATION OF THE MODEL DEMONSTRATES THAT REGENERATIONDEPENDS ON THE …
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Measurement of helium isotopic composition in cosmic rays with AMS-02
… velocity and rigidity give a measurement of particle mass that allows the measurement of relative isotope abundances. The resolution of measured mass is described in detail by template functions based on the underlying resolutions of the silicon tracker and ring-imaging Cerenkov detector …
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Mesh-free modeling of spatially inhomogeneous aerosols in arbitrary geometries
… As the model progressed in time, the average mass of the suspended aerosol particles grew. This indicated the presence of coagulation. Lastly, an isothermal Mason condensation model was added to the code. Again, the program was run for 20 simulated seconds. Particle mass increased …
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Effect of driving cycles on the particulate mass and number emissions from in-use heavy heavy-duty diesel vehicles
This study focused primarily on the particle mass and number emission from various in-use heavy heavy-duty diesel vehicles operating on different driving cycles. Chemical speciation results are also presented to discuss the formation and composition of particles emitted during various cycles. Tests …
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Relaxation behavior of dense suspensions
Dense suspensions of solid particles in Newtonian fluids exhibit a variety of non-Newtonian behaviors depending on the shear stress applied to the suspension and the particle mass fraction ([mathematical symbol]m). Suspensions at sufficiently high fm shear-thicken dramatically and eventually shear …
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