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 37 for “"Low Background"”.
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A feasibility study for electron-muon correlations at ALICE
… The e-μ channel would provide a much cleaner/low background signal than other currently-utilized probing methods, but it is statistics-limited, a re-striction which is of increased concern at ALICE due to the detector's geometry. With the use of Pythia simulations, the viability of undertaking …
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Radiopurity measurement of acrylic for the DEAP-3600 dark matter experiment
… surface of the acrylic vessel are a source of background. If a fraction of the alpha energy is observed, or if the recoiling nucleus from the alpha decay is observed, the event will not be separated from a dark matter candidate event. In addition to the low level of inherent contamination from …
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An air sampling system to estimate concentrations of argon-41 in the V.P.I. physics building during reactor operation
… spectrometer was assembled. and calibrated in a low background radiation area to analyze air samples. Air samples were taken from different locations in the physics building during reactor operation to determine the concentrations of A⁴¹ released to the surroundings of the building during reactor …
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Evaluation of bacterial sampling methods for use with the bacterial tag-encoded flexible (FLX) amplicon pyrosequencing (bTEFAP) technique
Background: The need to enumerate airborne microorganisms during infectious disease outbreaks, indoor air quality evaluations, and agricultural health studies has identified limitations in culture-based or viable sampling and characterization of bioaerosols. Pyrosequencing promises to be a novel, …
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Planar visual fusion scintigraphy
… imaging has subjectively been very useful in low background applications such as lymphoscintigraphy, whole body 1-131 Nal imaging for thyroid cancer and In-l 11 WBC infection imaging.
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Rare-event searches with bolometers
… have grown larger and more sophisticated, allowing us to probe new and exciting theories of the universe. At the same time, we have started to apply the technologies and techniques used in rare-event searches to areas of applied physics, for example; reactor monitoring using Coherent Elastic …
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Super-resolution wide-field optical microscopy by use of Evanescent standing waves
… high resolution, high speed imaging techniques allows the study of dynamical processes in biological systems. Optical fluorescence microscopy is an essential tool for investigations in many disciplines in biology and medicine with molecular specificity. The resolution of optical far-field …
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Double-Beta Decay of <super>150</super>Nd to Excited Final States
… provides a considerable reduction in background in the regions of interest.</p> <p>This study yields the first results from KURF and the first detection of the</p> <p>coincidence gamma rays from the 0<super>+</super><sub>1</sub> excited state of <super>150</super>Sm. These gamma …
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Portable Tungsten Coil Atomic Emission and Atomic Fluorescence Spectrometry
… field applications because of its simplicity, low cost, low power requirement and independence from cooling systems. A new, portable, compact design is reported here. The tungsten coil is extracted from a 24 V, 250 W commercial projector light bulb. The coil is housed in a small, aluminum cell. …
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Developing Nucleic Acid-Based Sensors and Actuators
… loop. This topology confers high dynamic range, low background, minimal off-target effects, and a small genetic footprint. I envision that the approaches described here have broad applications from basic science to advanced diagnostics and therapeutics, illustrating the great potential of …
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Alpha Spectroscopy in a Superheated Bubble Chamber and the Design of the PICO-500 Hydraulic Control Cart
… to distinguish alpha and neutron-induced background events. The acoustic data is processed into a quantity called the Acoustic Parameter (AP), which is critical for vetoing background events in dark matter searches. This study used background data from the PICO-40L bubble chamber to …
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Electronic States near Surfaces - a) Analysis of calculation methods using semi-infinite boundary conditions; b) Sensitive detection using laser photoelectron spectroscopy
… with pulsed laser excitation can provide a low-background, sensitive view of electronic states in the band gap and photo-populated states above the Fermi level. Measurements of photoelectron emission for ultra-high vacuum cleaved surfaces of CdSe, excited by 4.5 and 5.9 eV Ti:sapphire laser …
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Search for neutrinoless double-beta decay and 42Ar in enriched xenon using the EXO-200 dataset
… discriminator. The author produced an expanded background model to search for radioactive 42Ar via its β-decay product, 42K. No signal excess was observed near the 0νββ Q-value, leading to a limit on the 0νββ half-life in 136Xe of T_(1/2)^0ν >3.0×10^25 yr and Majorana neutrino mass 〈m_ββ …
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Microfluidic Techniques for Protein Detection and Manipulation
… are often in the nM to μM range, probing at such low concentrations requires highly sensitive techniques. An improved understanding of the functioning of proteins lead to increased drug usage in combating diseases. Bio-compatible and bio-degradable drug-carrying vehicles are highly desirable. This …
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RNA-level controllers for programmable gene expression in mammalian cells
… there remains a need for genetic devices that allow for precise control over endogenously and exogenously expressed genes. Here, through two examples, we demonstrate that RNA is well-suited for engineering compact, programmable biomolecular tools with sense and actuate functionalities. In the …
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Detection of Solar Neutrino Absorption and Study of TPB and Acrylic Fluorescence in DEAP-3600
… that can use the high livetime of the ultra-low background LAr detector to expand the scientific output of the experiment. With recent hardware upgrades, there is also a motivation to improve the detector simulation model and the understanding of the detector by studying properties of …
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Super-Resolution Fluorescence Microscopy using Transparent Waveguide Chips
… fluorescence microscopy (optical nanoscopy) allows us to surpass the optical diffraction limit and observe biological phenomena at the nanoscale using visible light. Different modalities come with their own trade-offs, such as imaging speed vs. achieved resolution or live cell imaging …
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Studying the background response of Minihalo for design optimizations
… physics. It will will be used to construct low background He-3 counters for HALO-1kT supernova neutrino detector and will also provide experimental data on cross-sections of ν-Pb interactions at supernova energy scale. The detector will be placed at the SNS Facility in Oak Ridge National …
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Statistically robust methods for the integration and analysis of X-ray diffraction data from pixel array detectors
… these challenges. A method for estimating the background under each reflection during integration that is robust in the presence of pixel outliers is presented. This uses a generalised linear model (GLM) approach that is more appropriate for use with Poisson distributed data than traditional …
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Measurement of Pernitric Acid, Hydrogen Chloride, and Sulfur Dioxide during the Intercontinental Chemical Transport Experiment Campaign
… City, and the North Pacific which is the outflow region of Asia. The first direct in situ measurements of HO2NO2 were made in the free troposphere over the eastern U.S. during summer 2004. The highest mean mixing ratio of 76 pptv (median = 77 pptv, = 39 pptv) was observed in the altitude …
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