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 183 for “"needles"”.
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AN ANALYSIS OF THE BUCKLING BEHAVIOR OF SPINAL ANESTHESIA NEEDLES
The use of large gauge (G) spinal anesthesia needles can increase complications due to buckling. The purpose of this study was to, first, create a model to repeatably simulate and quantify the behavior of spinal needles in buckling and, second, quantify the buckling behavior of spinal anesthesia …
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Needles in the Quantum Haystack: CMS Anomaly Detection with Normalizing Flows
Recent experimental searches for particles beyond the Standard Model (BSM) have yielded little in the realm of new physics discoveries. A number of research efforts have adopted new anomaly detection strategies which utilize density estimation algorithms based on unsupervised and semi-supervised …
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Long silicon microfluidic needles for VTA and in-vivo differential neurochemical measurement
… buried oxide, enabling fabrication of 8–10 mm needles with sub-100 µm tip deviation in the best cases. Further on, I explore aluminum oxide hard mask integration processes, and its etch characterization to provide high etch selectivity over silicon nitride and silicon oxide and to improve …
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Study of damage to peripheral nerves caused by anaesthetic needles during regional anaesthesia
… caused by intraneural insertion of anaesthetic needles.<br/><br/><b>Methods and Materials</b>: Nerves resected from Thiel, soft embalmed human cadavers (Thiel nerves) and fresh cadaveric human nerves (Fresh nerves) were used in the study as specimens. Microultrasound scanning using a 30 MHz and …
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Solidification in a thin liquid film : growing Alq₃ needles via methanol-vapor annealing
… aluminum-promotes the growth of single-crystal needles; we explore this system through experiments, modeling, and analytical scaling laws. The first part of this thesis describes the growth of single-crystal Alq₃ needles from amorphous, thin films of Alq₃ annealed in methanol vapor. Micrographs …
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Fabrication of Ultrasound Transducers and Arrays Integrated within Needles for Imaging Guidance and Diagnosis
… the tissue, and aid in the safe navigation of needles towards a particular target such as a tumour in tissues such as the breast, brain or liver, at which point decisions surrounding diagnosis or treatment via in vivo tissue characterisation could be made. With this objective, challenges exist …
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A molecular characterization of the fungal endophytes within the needles of ponderosa pine (Pinus ponderosa)
… studied, the endophyte communities within the needles are not well characterized by molecular means: thus, the goal of this study was to do so. Needles were sampled at two sites located five kilometers apart along a slight precipitation gradient in Eastern Washington State. Fungal DNA (along …
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Using HI stacking to study galaxy properties in the nearby universe (Looking for needles in the HI-stack)
Neutral atomic hydrogen (Hi) is the raw fuel from which the star-forming molecular gas forms and is therefore an important tracer of galaxy evolution. Due to the intrinsic faintness of the Hi emission line (observed at rest at 21 cm), galaxies beyond a few hundred megaparsecs are difficult to …
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Needles in a Haystack: Perceptions of Deservingness on the Implementation of Harm Reduction Programs in the American Midwest
The association of opioid abuse with rural, white, working-class individuals ultimately generated sympathy, rather than hatred, in the general political zeitgeist. However, some cases deviated from this pattern by adhering to the common cycle and villainizing individuals with substance use disorder …
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Fear of needles among children and adolescents with type 1 diabetes mellitus : relationship with metabolic control (HbA1c) and quality of life
… study was to assess the prevalence of fear of needles among children and adolescents with type 1 diabetes mellitus and its effects on the quality of metabolic control measured with haemoglobin A1c (HbA1c) and quality of life. Method: 33 patients aged 9-16 years old with type 1 diabetes mellitus …
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Slender FRP Elements as Discrete Reinforcement for Concrete
… mechanism. These elements, referred to as “Needles” are very rigid and strong; when intersected by growing cracks in concrete under heavy and increasing loads, they do not break and deform minimally. In the present work major steps were taken to understand the reinforcing mechanism of …
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Experimental analysis of stove top designs for pine needle combustion in a semi-gasifier burner
… that the stove top plays in a stove where pine needles are the main fuel source. Pine needles have distinct characteristics in their combustion cycle that make it challenging to effectively harness the energy released for cooking purposes. Processed pine needles are currently used as a fuel …
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Characteristics of pine needle combustion in a semi-gasifier burner
… stove for people in the developing world. Pine needles are a cheap, energy-dense fuel source that can be harnessed for cooking purposes, but they are often physically or chemically altered prior to being used as a fuel. The challenge remains to develop a stove that uses unprocessed pine needles. …
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Changes in litter inputs and decomposition in headwater streams during a mountain pine beetle infestation of whitebark pine
… to compare differences in decomposition between needles from healthy WbP and those killed by MPB in a single stream within the high-mortality basin. Inputs of WbP needles were higher to streams in the basin with greater WbP mortality and these inputs were primarily entering streams via vertical …
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Changes in litter inputs and decomposition in headwater streams during a mountain pine beetle infestation of whitebark pine
… to compare differences in decomposition between needles from healthy WbP and those killed by MPB in a single stream within the high-mortality basin. Inputs of WbP needles were higher to streams in the basin with greater WbP mortality and these inputs were primarily entering streams via vertical …
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The effect of Zr and ZrB2 additions to NdFeB alloys
… solidification, but the excessive ZrB2-type needles formed in the NdFeB alloy may have a deleterious effect on the magnetic properties. However, the coercivity of the NdFeB sintered magnets can be improved to some extent by addition of Zr or ZrB2 to the composition …
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Purification and characterization of glutathione reductase isozymes specific for the state of cold hardiness of red spruce (Picea rubens sarg.)
… is present only during summer in non-hardened needles. A third isozyme is present only during winter in hardened needles. The isozymes present in non-hardened and hardened needles have been designated GR-INH and GR-IH, respectively. The major GR isoform has been designated GR-2NH or GR-H, …
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Comparative study of an antioxidant defense mechanism in genotypes of eastern white pine which show differential foliar characteristics
… to different chamber treatments. One-year-old needles always had lower ratios of ascorbate/ dehydroascorbate, ascorbate/α-tocopherol and GSH/GSSG than current year needles. One-year-old needles from the tolerant tree also maintained a higher glutathione reductase (GR) activity than the …
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Microneedle array patches for skin hyperthermia and enhanced intradermal drug delivery
Microneedles (MN) arrays are micron-size needle arrays with length generally ranging between 50 μm and 2 mm. When applied to the skin surface, they pierce the stratum corneum creating micropores that can enhance the delivery of drugs into the viable skin layers. MN arrays offer great advantages for …
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