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 31 for “"Micro-particles"”.
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Dynamics of Micro-Particles in Complex Environment
Micro-particles are ubiquitous in microsystems. The effective manipulation of micro-particles is often crucial for achieving the desired functionality of microsystems and requires a fundamental understanding of the particle dynamics. In this dissertation, the dynamics of two types of …
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Fabrication of Silicon Photovoltaic Micro-Particles for Low-Cost Solar Energy Generation
… solar technology based on silicon photovoltaic micro-particles and demonstrate a fabrication technique for such particles. The photovoltaic micro-particles can be manufactured from waste or low grade silicon, thus, keeping the material and manufacturing costs low. Different diffusion techniques …
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Techniques for Mass Determination of Airborne Micro-Particles in an Optical Dipole Force Trap
… for rapidly measuring the masses of airborne particles confined in free space optical dipole force traps. This technique employs an ultrafast CMOS sensor with a wide field of view to image the real time motion of trapped particles on timescales in which diffusive Brownian motion predicted by …
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Up-conversion In Rare-earth Doped Micro-particles Applied To New Emissive 2d Dislays
Up-conversion (UC) in rare-earth co-doped fluorides to convert diode laser light in the near infrared to red, green and blue visible light is applied to make possible high performance emissive displays. The infrared-to-visible UC in the materials we study is a sequential form of non-linear two …
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Fabrication of novel functional anisotropic micro-particles for foam stabilisation and structuring in food formulations
… of novel food-grade anisotropic solid particles for foam stabilisation and applications in food formulations. Two main techniques were employed for the fabrication of these particles. Acidic hydrolysis of Nata de Coco bacterial cellulose was used to form cellulose nano-rods which were …
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Preparation and Characterization of Spray Dried Fluorescent Micro particles for Controlled Release in the Lungs.
… purpose of the thesis was to prepare fluorescent micro particles by spray drying technique for the purpose of imaging in lungs. The four formulations were prepared using two polymers, hydroxy propyl cellulose and chitosan and two fluorescent dyes, Rhodamine B and Evans blue. The four formulations …
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Platelet micro-particles induce angiogenesis through the delivery of the micro-RNA Let-7a into endothelial cells
… activation and increased secretion of platelet micro-particles that induce angiogenesis. This study determined the role of platelet micro-particles derived microRNA in the regulation of angiogenesis and migration, with a focus on the regulation of thrombospondin-1 release by platelet …
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Signal variation in single particle aerosol mass spectrometry
Rapid and accurate detection of airborne micro-particles is currently an important problem in national security. One approach to such detection, bioaerosol mass spectrometry (BAMS), is currently under development at Lawrence Livermore National Laboratory. BAMS is a type of single particle aerosol …
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Design and Characterization of a Dust Injector for Future Studies of Tungsten Dust in the STOR-M Plasma
… will utilize calibrated, spherical tungsten micro-particles. A known mass of these tungsten micro-particles are to be injected into STOR-M with control over the position of the dust plume. This will enable future observation and study of dust dynamics within STOR-M. In preparation for this …
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Optical Binding Phenomena: Observations and Mechanisms
… on the optical binding of optically-trapped micro-particles are presented. A sophisticated Mie scattering model is developed, capable of performing time-evolution simulations of a multi-particle system. This is used to analyse and interpret experimental results in evanescent and Gaussian beam …
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Modeling and control of a self-assembled robotic swimmer
… forms when a liquid suspension of ferro-magnetic micro-particles and a non-magnetic bead are exposed to an alternating magnetic field that is oriented per- pendicular to the liquid surface [1]. It can be steered by modulating the frequency of the alternating field. We model the swimmer as a …
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Closed-Loop Control of Mesoscale Magnetic Robots Using a Global Magnetic Field
… three types of mesoscale (milli- and microscale) magnetic robots: magnetic swimmers, magnetic modular cubes, and ferromagnetic micro-particles. Mesoscale magnetic robots show great potential for revolutionizing many aspects of medical and clinical applications. The dissertation …
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Investigation of Advanced Material Through Digital Volume Correlation Measurement Techniques
… composite structures. Through the utilization of micro-computed tomography datasets can be obtained and utilized to visualize three-dimensional dataset for DVC. This thesis explores the utilization of DVC for the analysis of composite materials. A methodology is developed based on artificially …
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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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A malaria diagnostic system based on electric impedance spectroscopy
… electric impedance spectroscopy (EIS) on a microfluidic device as a means of malaria diagnosis. This work introduces a microfabricated probe with microfluidic channel, and a high speed impedance analyzer circuit board. Combination of microfluidic device and circuit board resulted in a …
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Water quality requirements for first-feeding in marine fish larvae of the Cape of Good Hope, with description of developmental stages
… point-of-no-return. The suitability of assorted micro-particles (including the rotifer, Proales, and Pine pollen) as experimental foods is discussed.
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Micro fluidic cytometry for analysis of marine microorganisms
… distribution and concentration of phytoplankton (microscopic algae that live in the oceans) is important, as this reflects and may modify environmentally important events such as pollution, climate change and carbon dioxide sequestration. Optical based flow cytometry has proved to be strategically …
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The role of microvesicles in EMT and tumour microenvironment
Microvesicles are heterogeneous population of micro-particles released constitutively and upon induction from healthy and unhealthy cells. The role of cancer cell derived-MV in intercellular communication gains an intensive aria of research. The influence of leukaemia cell derived-MVs in this study …
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Turbulence-particle interactions on surfaces
The physics of adhesion and detachment of particles in ventilation ducts is important to understand and control contaminant and pathogen dispersal indoors. This thesis presents an experimental characterization of parameters which affect the resuspension of settled micro-particles and spores in a …
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Microbubble streaming flows for non-invasive particle manipulation and liquid mixing
… emerging and inter-disciplinary fields, such as micro/nano manufacturing processes, biomedical engineering, lab-on-a-chip diagnostic technology, micro fuel cell, and bio-fluidics. As the length scale shrinks, the synergy of micro-hydrodynamics with various external force fields (capillary forces, …
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