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 29 for “"SBRs"”.
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The development of large area saturable Bragg reflectors for the generation of widely-tunable ultra-short pulses
… large area broadband Saturable Bragg Reflectors (SBRs). Semiconductor lasers explore the use of 3D and 2D quantum confinement of charge carriers within quantum dots (QD) and quantum wells (QW) lasers respectively. The index-guided QD and QW heterostructure lasers that were fabricated in this work …
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State-business relations and economic transition in the modern world-system: a comparative study of South Africa and Zimbabwe
This thesis examines state-business relations (SBRs) in semi-peripheral South Africa and peripheral Zimbabwe following each country’s transition to majority rule. This study offers an explanation for why SBRs are likely to either consolidate or fracture in post-transition communities over time …
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Fate and Impacts of Contaminants of Emerging Concern during Wastewater Treatment
… lab-scale nitrifying sequencing batch reactors (SBRs), relative to control SBRs received no materials or ionic/bulk analogs. Nitrification function was only inhibited by high load of 20 mg/L Ag+, but not by other nanomaterials or analogs. However, decrease of nitrifier gene abundances and …
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Biological Health Assessment of an Industrial Wastewater Treatment Facility
… were evaluated. Sequencing batch reactors (SBRs) were used to monitor the effects of graphite on mixed liquor suspended solids (MLSS), removal of soluble chemical oxygen demand (sCOD), and specific oxygen uptake rates (sOUR). Graphite appeared to have no adverse effect on the microbes. The …
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Engineering light using large area photonic crystal devices
… crystal devices. Saturable Bragg reflectors (SBRs) can be used to self-start ultra-short pulse generation in a variety of solid state and fiber lasers. To form shorter pulses, SBRs with broadband reflectivity and large area (100's of [mu]m) are required. This thesis describes the design and …
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Mechanistic understanding of biogranulation for continuous flow wastewater treatment and organic waste valorization
… biogranulation in sequential batch reactors (SBRs). In this study, this physical selection pressure was firstly weakened and then eliminated in CFRs to investigate its role in maintaining the long-term structural stability of aerobic granules. Given the fact that implementing settling …
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Evaluation of Nitrification Inhibition Using Sequencing Batch Reactors and BioWin Modeling, and the Effect of Aqueous Film Forming Foam on Biological Nutrient Removal
… upsets, continuous sequencing batch reactors (SBRs) were operated to simulate the full-scale plant. Four reactors were operated in this study. One reactor was fed with raw influent (RWI) from the Nansemond Wastewater Treatment Plant (NP). Another was fed with NP primary clarifier influent …
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Wastewater treatment alternatives for a vegetable and seafood cannery
… were performed using sequencing batch reactors (SBRs) to treat the segregated wastewater from the caustic tomato peeling operation. This isolated 98% of sodium present in the wastewater. Previously, all wastewater was land applied and the high sodium content damaged soil structure. Sodium levels …
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Silicon-germanium saturable absorbers and erbium-doped waveguides for integrated mode-locked lasers
… higher repetition rate lasers application. The SBRs are tested experimentally inside an Erbium glass bulk laser. We also tested Erbium-doped waveguide chips fabricated by Inplane Photonics Inc. to verify that it has enough gain to function as a gain medium of an on-chip laser. These components …
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Rapid material interrogation using X rays from a dense plasma focus
… using the signature-based radiation-scanning (SBRS) technique. The SBRS technique uses template matching to differentiate targets that contain certain types of materials, such as chemical explosives or drugs, from those that do not. Experiments were performed with different materials in cans of …
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Low-cost, highly efficient, and tunable ultrafast laser technology based on directly diode-pumped Cr:Colquiriites
… semiconductor saturable absorber mirrors (SESAMs/SBRs) were developed, which were used to initiate and sustain mode-locking. Typical performance was ~25-100 fs pulses, with an optical spectrum in the 770-920 nm range, with ~1-2 nJ of pulse energies from ~100-MHz repetition rate cavities. Record …
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Synthesis and Characterization of Multiphase Block Copolymers: Influence of Functional Groups on Macromolecular Architecture
… were introduced to styrene-butadiene rubbers (SBRs). Introducing UPy groups to SBRs drastically changed the physical properties of these materials. Specifically, the SCMHB networks served as mechanically effective crosslinks, which raised Tg and enhanced the mechanical performance of the SBRs. …
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Fundamental studies of mixed gas plasmas in ICP-MS
… instrument were optimized to yield maximum SBRs for elements across the mass range. It was shown that simple manual tuning of the instrument did not effect the SBRs, when compared to the simplex optimized conditions. Finally it was shown that the addition of molecular gases to the ICP, did …
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Positron Emission Tomography Phantom Studies for Radiation Therapy Target Delineation
… phantoms at various signal to background ratios (SBRs). Phantom studies revealed that as the SBR decreases the required threshold increases. Also, smaller phantom volumes required a larger threshold than larger phantom volumes. Phantom studies revealed that more spherical targets require a higher …
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The Kinetics, Biochemical Patterns, and Microbial Ecology in Multiredox (Anoxic, Microaerobic, Aerobic) Activated Sludge Systems Treating BTX Containing Wastewater
… and aerobic toluene-degraders in all three SBRs.
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Acid-phase and Two-phase Codigestion of FOG in Municipal Wastewater
… digesters operated as sequencing batch reactors (SBRs). Volatile fatty acid (VFA) production was found to increase with larger FOG loading rates, although this increase was insignificant compared the theoretical VFA production from FOG addition. Long chain fatty acids (LCFAs) were found to have …
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Methods for optimization of the signature-based radiation scanning approach for detection of nitrogen-rich explosives
The signature-based radiation scanning (SBRS) technique can be used to rapidly detect nitrogen-rich explosives at standoff distances. This technique uses a template-matching procedure that produces a figure-of-merit (FOM) whose value is used to distinguish between inert and explosive materials. The …
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The Effectiveness of Multiple Redox Treatment Strategies on the Treatability of a High Strength Industrial Wastewater
… demand (COD), by three sequencing batch reactor (SBRs) systems operated under alternating redox environments: anaerobic/aerobic (ANA), anoxic/aerobic (ANX), and aerobic was investigated. A synthetic wastewater was modeled after a wastewater from an existing chemical processing facility. The …
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Evaluation of gasoline-denatured ethanol as a carbon source for wastewater denitrification
… in lab-scale, sequencing batch reactors (SBRs). We also focused on the quantification of BTEX present in dEtOH solution and the inhibition potential of these compounds on both nitrification and denitrification. BTEX content in the dEtOH solution had low and consistent concentration. …
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Effect of Reactor Feeding Pattern on Performance of an Activated Sludge SBR
… was studied in this experiment. A series of SBRs were operated at different sodium concentrations that ranged from 1.5 - 15 meq/L and different feeding times that ranged from 1 minute to 4 hours. Biomass samples were taken from each reactor to study the settling and dewatering properties and …
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