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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 58 for “"Whisker"”.
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Passive wake detection using seal whisker-inspired sensing
… resulting from the geometry of the harbor seal whisker. First, force measurements and flow visualizations on a rigid whisker model undergoing 1-D imposed oscillations show that the geometry passively reduces VIV (factor of >10), despite contributions from effective added mass and damping. This …
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Passive wake detection using seal whisker-inspired sensing
… visual cues blocked, pointing to use of their whiskers as sensors of minute water movements. In this work, I elucidate the basic uid mechanisms that seals may employ to accomplish this detection. Key are the unique ow-induced vibration properties resulting from the geometry of the harbor seal …
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Effects of Whisker-Trimming on GABAA Receptors in S1 Cortex
… Layers 2/3 above the deprived and adjacent whisker barrels were located in tangential sections, using patterns of radial blood vessels as fiducial marks. In deprived whisker barrel columns, [3H]muscimol binding to GABAA receptors decreased by 12.8% ± 1.2 (P < 0.001) in layers 2/3 and 11.4% ± …
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Processing and Characterization of Silicon-Carbide Whisker/alumina Matrix Composites
… in the fracture toughness behavior of SiC whisker/$\rm Al\sb2O\sb3$ matrix composites. Composites of greater than 99.5% density were produced by hot pressing mixtures of submicron $\rm Al\sb2O\sb3$ powder and SiC whiskers. Two sources of whiskers were utilized, Silar SC-9 whiskers from Arco …
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Design and vibration testing of a flexible seal whisker model
Harbor seal whiskers have a unique surface structure that dramatically reduces vortex induced vibrations as they move through the water. Concurrently with rigid whisker experiments, this project focuses on the design and testing of a flexible model. The rubber model was cast with integrated Kevlar …
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Synthesis and characterization of in situ whisker-reinforced glass-ceramics
The effects of in situ Ti0₂ whisker reinforcement on mechanical and thermal properties of glass-ceramics in the Li₂O-Al₂0₃-P₂0₆-Si0₂ system were investigated. When Ti0₂ whiskers, having an average aspect ratio of 28, are precipitated from the glass-ceramic matrix, …
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Rotational movement of a harbor seal whisker during vortex induced vibrations
Harbor seal whiskers have geometry that reduces vortex induced vibrations. Previous experiments with rigid models of the harbor seal whiskers has shown that the reduced vibration of the whisker can be used to detect the wake of other objects in water. This project focused on expanding the …
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Feeling out Your Food: A Histological Analysis of the Whisker System in Seals
<p>The vibrissal (whisker) system is present in nearly all mammals and is especially important in deep-diving mammals. Pinnipeds (seals, sea lions, and walruses) have highly sensitive whiskers that are used to follow hydrodynamic trails created by their swimming prey. Each pinniped vibrissa is …
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ms-Scale temporal coding in the thalamus predicted by whisker dispersive vibrational transduction
Whether stimulus information is encoded in the whisker system has been a question of debate. Considering the remarkable temporal precision in the whisker system with spike timing as small as 10μs, there is potential for ultrahigh capacity information channel in kb/s. To study temporal structures in …
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Processing, characterization, and mechanical properties of beta silicon nitride whisker/silicon nitride matrix composites
… consisting of $\beta$-$\rm Si\sb3N\sb4$ whisker reinforced polycrystalline $\rm Si\sb3N\sb4$, were fabricated with controlled whisker/matrix interfaces, characterized on the microstructural level, and evaluated for mechanical reliability. As-received and coated $\beta$-$\rm Si\sb3N\sb4$ …
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Development of SiC whisker/chopped SiC fiber reinforced (Ca<sub>0.6</sub>,Mg<sub>0.4</sub>)Zr₄(PO₄)₆ ceramic matrix composites
SiC whisker reinforced (Ca<sub>0.6</sub>,Mg<sub>0.4</sub>)Zr₄(PO₄)₆ (CMZP) matrix composites containing 10, 20, and 30 vol % whiskers were produced using a glass encapsulated hot isostatic pressing (HIPing) technique. The best HIPing temperature, pressure, and time conditions to optimize composite …
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Tactile tomographic imaging using robotic whiskers
… sense through movement by oscillating their whiskers back and forth to extract environmental information including nearby object features and fluid-flow characteristics. However, current array sensory systems do not fully utilize tactile sensing strategies extensively used by these animals. …
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Formation of salt crystal whiskers on nanoporous coatings and coating onto open celled foam.
Salt crystal whiskers were grown from salt solution saturated nanoporous silica coatings. Coated substrates were partially immersed into an aqueous potassium chloride solution and then kept in a controlled relative humidity chamber for whisker growth. The salt solution was first wicked into the …
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Thermophysical properties of glass and glass-ceramic composites
… The thermal conductivity and diffusivity of SiC whisker reinforced Ba-osumilite glass-ceramic exceeded that of SiC fiber reinforced osumilite due to higher thermal conductivity and diffusivity of the whiskers. An anisotropy was observed in thermal conductivity of the whisker composite due to …
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Investigation of Bio-Inspired Pin Geometries for Heat Transfer Applications
… cooling performance. Bio-mimicked harbor seal whisker have been studied from an aerodynamic standpoint, due to their ability to reduce drag and flow unsteadiness. While applying this mimicked geometry in thermal management research, it was found that they lead to reduction in cooling system …
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Accelerating development of treatments for trigeminal neuralgia using intranasal delivery and a novel behavioral screening device for rats.
… a normally non-painful air puff stimulus on the whisker pad. This device detected, 5 to 12 hours after infraorbital nerve injection, that carrageenan (2% or 4%) reduced sip rate by inflaming the whisker pad. During the same time period, intranasal 10% lidocaine (8mg) reversed this reduced sip …
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The role of fast-spiking interneurons in cortical map plasticity
… somatosensory cortex of the contralateral facial whiskers. A brief period of whisker trimming causes the representation of the nontrimmed whiskers (spared) to expand into the cortex that has lost its principal sensory input (deprived). It has been hypothesized that this is mediated by a period of …
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Micro/Nano-Scale Investigation on SN Alloys and SNO2 Nanowires
… the intriguing phenomenon of spontaneous Sn whisker growth from Sn / Sn-alloy thin films have bothered, yet also inspired materials scientists for over 60 years. The most commonly seen Sn-containing compound, SnO<sub>2</sub>, is in high demand as well due to its exceptional electronic and …
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Spatiotemporal Dynamics of Tissue Oxygenation in Awake, Behaving Mice
… intracellular [Ca2+] in response to prolonged whisker stimulation. The magnitude and kinetics of these changes were related to the cerebrovascular segment within the cranial window. Unlike the early component (1-5sec), the magnitude of the late hemodynamic component (20-30sec) was strongly …
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Experimental Measurements of Vestibular Hair Bundle Stiffness in the Red Ear Slider Turtle Utricle
… measure the stiffnesses was composed of a glass whisker (attached to a pipette) used to produce a force on the tip of the bundle, an extrinsic Fabry-Perot interferometer (EFPI) to measure the displacement of the pipette, and a photoelectronic motion transducer (PMT) to measure the displacement of …
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