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 28 for “"16 mm"”.
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MONTE CARLO MODELING OF THE GAMMA KNIFE PERFEXION<sup>TM</sup>
The Gamma Knife Perfexion<sup>TM</sup> is a radiosurgical treatment device used to irradiate targets in the head such as tumors, blood vessel defects, and malfunctioning nerves. It uses 192 high activity Cobalt-60 sources collimated to a common focus to impart radiological damage to the target …
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Subsidence Cracking of Concrete Over Steel Reinforcement Bar in Bridge Decks
… of the cover concrete. Concrete specimens with 16 mm (# 5) diameter bars were cast with various cover depths, bar spacing and two concrete mixture types to determine the influence that epoxy coated reinforcement, cement type and bar spacing may have on the probability of subsidence cracking in …
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A Complete Dosimetric Model of the Gamma Knife Perfexion Using Penelope Monte Carlo Codes
The Gamma Knife Perfexion is a radiosurgical treatment device used to irradiate targets in the head. It uses 192 high-activity Cobalt-60 sources collimated to a common focus to impart radiological damage to the target structure while minimizing dose to adjacent healthy tissue. Tungsten collimators …
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A comparison of fixed tube current (FTC) and automatic tube current modulation (ATCM) CT methods for abdominal scanning : implications on radiation dose and image quality
… MATERIALS AND METHODS: Using a Toshiba Aquilion 16 CT scanner (120 kVp, 0.5 seconds tube rotation), an adult ATOM dosimetry and abdominal anthropomorphic phantom were exposed to a series of FTC and ATCM CT protocols with variations in tube current as follows: FTC - 100, 200, 250, 300 and 400mA; …
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Mechanical and psychophysical studies of surface wave propagation during vibrotactile stimulation
… delivered using an array of motors to communicate with the user. The way in which the display's motors are spaced and positioned on the body can have a significant impact on the effectiveness of communication, especially for tactile displays used to convey spatial information. The …
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Regime map development for co-rotating twin screw granulation
… was recognised for the short mixing geometry (16 mm, 30°), while three regimes (granulation, extrudates and blocked behaviours) were recognized for the long mixing geometry (64 mm, 30°). The regime maps suggested that the optimal granulation (narrow GSD (granule size distribution) and large …
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Seguimiento a largo plazo de pacientes sometidos a cierre percutáneo de foramen oval y comunicación interauricular
… hepático), el diámetro del defecto septal fue 15 mm (DE 9),y una mediana de 16 mm, El tamaño del dispositivo implantado fue de 40 mm (DE 3.9 mm) (13 mm y 34 mm). El seguimiento registró un tiempo promedio de 44 meses (DE 28,6), (7-114 meses) con una mediana de 36 meses, no se registraron eventos, …
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Clinical and Histological Characteristics of Melanocytic Nevus in External Auditory Canals and Auricles
… diameter of EAC and auricular nevi was 9.6 (3 – 16) mm and 12.2 (3 – 25) mm, respectively. Histological findings chiefly presented intradermal nevi in EACs (78.3%) and auricles (83.3%) which showed preference to older patients, in contrast to the compound type. All nevi including five cases with …
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Mathematical model of the sprint relay race.
… had been performed with a single highspeed 16 mm cine camera (LOCAM) at 50 fps. The coordinates were digitized, scaled and filtered using a low pass, critically damped, 4$\sp{\rm th}$ order, zero-lag Butterworth digital filter with a 1 Hz cutoff frequency. Linear velocities were calculated …
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Temperaturentwicklung bei der Markraumbohrung : ein Vergleich verschiedener Bohrtechniken und Bohrsysteme
… Bei der Aufbohrung zur Marknagelung kommt es zur Entstehung von Reibungswärme. Es sind Fälle bekannt, bei welchen es zu Osteonekrose nach Aufbohrung kam. Anhand verschiedener Versuchsvorgaben soll hier geklärt werden, ob sich die beim Bohren entstehende Wärme durch einfache Methoden wie …
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STABILITY OF TEMPORARY ANCHORAGE DEVICES IN VARYING PORCINE BONE DENSITIES
… amount of interlocking between the TAD and bone immediately after insertion. The aim of the study was to evaluate the effect of bone mineral density (BMD) on TAD stability in vitro.Methods: Porcine jawbone samples were collected from a local slaughterhouse and maintained hydrated. Samples were …
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Experimental and Theoretical Investigation of Correlating TOF-Camera Systems
… in the discussion. This work reveals three common systematic errors: the variation due to the anharmonic LED modulation provokes a periodic depth error of around 80-200 mm (depending on camera), the inhomogeneity of the pixels accounts for around 20 mm and the constant offset depending on the …
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Selection of benthic habitat by yellow-phase American eels (Anguilla rostrata)
… yellow-phase American eels (n = 130, 224--338 mm TL) conditional on five benthic substrate types common to many rivers within the geographic range of the American eel. During nine, 4-day trials replicated with three aquaria, American eels were given a choice to burrow into five equally …
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Two-dimensional, viscous flow modeling of roll-back subduction : numerical investigation into the role of slab density in subduction dynamics
… out into the mantle below, generating stable, asymmetric subduction. Slabs driven faster than the "intrinsic" (dynamically consistent), steady-state retreat rate of the system (vr) are characteristically arcuate, pushed upward from the base of the mantle layer by strong horizontal "return flow" …
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High force density linear permanent magnet motors : "electromagnetic muscle actuators"
… ratio to be built for the case of a winding immersed in a homogeneous magnetic field. This model is then modified with a small set of dimensionless parameters to describe the performance penalties imposed by the use of practical sources of magnetic field, specifically periodic arrays of …
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Tissue Oxygen Imaging for Non-invasive Metastasis Detection
… its correlation to measurements from a commercial dissolved oxygen probe. PALI was shown to be an accurate oxygen sensor as a strong correlation was observed (R2 = 0.998). Simulations and bench top experiments in a tissue mimicking phantom were then used to determine PALI’s imaging depth. …
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Combined convection and other effects in heat transfer in horizontal flows
… convection in horizontal duct flow. A 3 m long, 16 mm I.D. copper pipe is used, with uniform peripheral electrical heating. Wall temperature measurements are taken at twelve axial positions. The experiment covers the range of stable mixed convection and strictly laminar flow conditions, with the …
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Caracterização microestrutural de juntas soldadas de aço ASTM A-1018 produzidas por soldagem helicoidal em campo
… desses tubos com espessura de parede de 12,5 mm, um deles com 16 mm e os três com diâmetro de 1200 mm. Cada um dos tubos teste foi soldado com velocidades distintas (800, 1200 e 1600 mm/min) com dois passes de solda automatizado (passe interno e passe externo), pelo processo de arco submerso. …
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Estudio sobre la utilización de árido reciclado para la fabricación de hormigón estructural
… se han tamizado para obtener la fracción 4/16 mm, sobre la que se han realizado los ensayos que establece la normativa española y europea para los áridos gruesos naturales, incluyendo además, ensayos específicos para los áridos reciclados como el contenido de impurezas o el contenido de …
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Actinobactérias isoladas da rizosfera de Ziziphus joazeiro (Juazeiro) do bioma da caatinga frente a isolados clínicos de Staphylococcus aureus
… linhagens de actinobactérias registradas como J168, J181, J835 e J867. A caracterização morfofisiológica foi realizada com base no International Streptomyces Project, a análise molecular foi realizada a partir do gene 16 S rRNA, foi avaliada a produção de esterase, pectinase, celulase, amilase e …
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