Relevant bibliographies by topics / Biomedical engineering. Electronics. Instrumentation / Dissertations / Theses
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Dissertations / Theses on the topic 'Biomedical engineering. Electronics. Instrumentation'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 August 2024

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1

Martel, Sylvain. "A predictable real-time system for control and instrumentation /." Thesis, McGill University, 1996. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=42092.

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Many research and commercial environments need to measure fast time varying signals and need to control subsystems, e.g. actuators, also in real-time with high bandwidth and minimum latency. Existing commercial systems for data acquisition and control have many shortcomings and behave in a non-deterministic manner. Determinism or predictability is a key element of high performance real-time systems which must always meet specific deadlines under tight synchronizations. In this thesis, a new approach to very high-performance predictable real-time acquisition and control is proposed, theoretical
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2

Morgan, Jones Molly. "Governing the constructs of life : what constitutes ‘good’ governance?" Thesis, University of Sussex, 2011. http://sro.sussex.ac.uk/id/eprint/6972/.

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This thesis explores contrasting perspectives on what constitutes 'good governance' for human embryonic stem cell (hESC) research. It asks whether there are systematic differences between perspectives of UK and US policy actors and what kinds of patterns are discernible. Biomedical technologies like hESCs generate complex interactions between public values, institutional interests, societal expectations and technological uncertainties. These pose serious governance challenges. Under such conditions, diverse aspects and implications of risk, ambiguity and uncertainty come into focus. We need ap
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3

Aziz, Ayesha. "A service oriented architecture to implement clinical guidelines for evidence-based medical practice." Thesis, University of Sussex, 2015. http://sro.sussex.ac.uk/id/eprint/53223/.

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Health information technology (HIT) has been identified as the fundamental driver to streamline the healthcare delivery processes to improve care quality and reduce operational costs. Of the many facets of HIT is Clinical Decision Support (CDS) which provides the physician with patient-specific inferences, intelligently filtered and organized, at appropriate times. This research has been conducted to develop an agile solution to Clinical Decision Support at the point of care in a healthcare setting as a potential solution to the challenges of interoperability and the complexity of possible sol
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4

Do, Khoa Tat. "Universal Engineering Programmer - An In-house Development Tool For Developing and Testing Implantable Medical Devices In St. Jude Medical." DigitalCommons@CalPoly, 2011. https://digitalcommons.calpoly.edu/theses/488.

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During development and testing of the functionality of the pacemaker and defibrillator device, engineers in the St. Jude Medical Cardiac Rhythm Management Division use an in-house development tool called Universal Engineering Programmer (UEP) to ensure the device functions as expected, before it can be used to test on an animal or a human during the implantation process. In addition, some applications of UEP are incorporated into the official releases of the device product. UEP has been developed and used by engineers across departments in the St. Jude Medical Cardiac Rhythm Management Divis
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Chen, Chang Hao. "Instrumentation amplifier and filter design for biopotential acquisition system." Thesis, University of Macau, 2010. http://umaclib3.umac.mo/record=b2182898.

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6

Butler, Nickolas Andrew. "Development of a Myoelectric Detection Circuit Platform for Computer Interface Applications." DigitalCommons@CalPoly, 2019. https://digitalcommons.calpoly.edu/theses/1981.

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Personal computers and portable electronics continue to rapidly advance and integrate into our lives as tools that facilitate efficient communication and interaction with the outside world. Now with a multitude of different devices available, personal computers are accessible to a wider audience than ever before. To continue to expand and reach new users, novel user interface technologies have been developed, such as touch input and gyroscopic motion, in which enhanced control fidelity can be achieved. For users with limited-to-no use of their hands, or for those who seek additional means to i
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Shah, Pratikkumar. "Development of a Lab-on-a-Chip Device for Rapid Nanotoxicity Assessment In Vitro." FIU Digital Commons, 2014. http://digitalcommons.fiu.edu/etd/1834.

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Increasing useof nanomaterials in consumer products and biomedical applications creates the possibilities of intentional/unintentional exposure to humans and the environment. Beyond the physiological limit, the nanomaterialexposure to humans can induce toxicity. It is difficult to define toxicity of nanoparticles on humans as it varies by nanomaterialcomposition, size, surface properties and the target organ/cell line. Traditional tests for nanomaterialtoxicity assessment are mostly based on bulk-colorimetric assays. In many studies, nanomaterials have found to interfere with assay-dye to prod
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8

Leon, Errol Heradio. "Design and Fabrication Techniques of Devices for Embedded Power Active Contact Lens." DigitalCommons@CalPoly, 2015. https://digitalcommons.calpoly.edu/theses/1387.

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This thesis designed and fabricated various devices that were interfaced to an IC for an active contact lens that notifies the user of an event by detection of an external wireless signal. The contact lens consisted of an embedded antenna providing communication with a 2.4GHz system, as well as inductive charging at an operating frequency of 13.56 MHz. The lens utilized a CBC005 5µAh thin film battery by Cymbet and a manufactured graphene super capacitor as a power source. The custom integrated circuit (IC) was designed using the On Semiconductor CMOS C5 0.6 µm process to manage the battery an
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9

Rodriguez-Velez, Ayshka Elise. "Power Mobility Sensor Data Collection Verified through Standardized Pediatric Assessments." UNF Digital Commons, 2018. https://digitalcommons.unf.edu/etd/828.

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The collaboration between the School of Engineering and the Department of Physical Therapy at the University of North Florida has introduced the possibility of creating a new environment for pediatric physical therapy assessments. There are currently no methods for remotely monitoring children with impairments. However, with embedded sensor technology in the form of power mobility and accepted therapy assessment tools, remote monitoring can become a possibility. As a part of this work, a ride-on toy car was developed as a remote monitoring device and a case study with a child with a mobility i
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10

Ju, Young Min. "A novel bio-stable 3D porous collagen scaffold for implantable biosensor." [Tampa, Fla] : University of South Florida, 2008. http://purl.fcla.edu/usf/dc/et/SFE0002354.

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11

Ibrahim, Mouhamad. "Mesure de bioimpédance électrique par capteurs interdigités." Thesis, Université de Lorraine, 2012. http://www.theses.fr/2012LORR0307/document.

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Ce travail de thèse traite de la caractérisation par spectroscopie d'impédance d'échantillons biologiques de très faibles dimensions. Les phénomènes de polarisation, classiques en spectroscopie d'impédance, créent une contrainte et augmentent l'erreur de mesure en basses fréquences. L'objectif principal de cette thèse est l'optimisation géométrique de la structure d'un capteur à électrodes interdigitées afin d'élargir la bande de fréquence utile. Le premier chapitre synthétise les données fondamentales relatives au comportement électrique des tissus biologiques ainsi que leurs propriétés élect
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12

Ibrahim, Mouhamad. "Mesure de bioimpédance électrique par capteurs interdigités." Electronic Thesis or Diss., Université de Lorraine, 2012. http://www.theses.fr/2012LORR0307.

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Ce travail de thèse traite de la caractérisation par spectroscopie d'impédance d'échantillons biologiques de très faibles dimensions. Les phénomènes de polarisation, classiques en spectroscopie d'impédance, créent une contrainte et augmentent l'erreur de mesure en basses fréquences. L'objectif principal de cette thèse est l'optimisation géométrique de la structure d'un capteur à électrodes interdigitées afin d'élargir la bande de fréquence utile. Le premier chapitre synthétise les données fondamentales relatives au comportement électrique des tissus biologiques ainsi que leurs propriétés élect
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13

Soski, Daniel Aaron. "Extended-Use ECG Monitor." DigitalCommons@CalPoly, 2018. https://digitalcommons.calpoly.edu/theses/1875.

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In this thesis, a prototype ECG monitor was developed that is integrated into an elastic shirt and takes a 3-lead ECG for over 5 days. The high-quality measurements can be used to identify markers indicative of various detrimental heart conditions. Measurements recorded by the device are encrypted and stored onto a micro-SD card. Current Holter monitors are expensive and have functional lives less than 48 hours; however, extended duration monitoring has been proven more useful in diagnosis. The device designed demonstrates that ECG measurements can be taken over longer durations without sacrif
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14

Mares, David M. "Developmental laboratories for biomedical instrumentation and digital signal processing with virtual instrument technology and diverse software techniques." Laramie, Wyo. : University of Wyoming, 2006. http://proquest.umi.com/pqdweb?did=1292461511&sid=1&Fmt=2&clientId=18949&RQT=309&VName=PQD.

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15

McLean, Calum Conner. "Instrumentation for the multiparameter assessment of speech defects." Thesis, University of Kent, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.362183.

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16

Vahesan, Srirajasingam. "Design and fabrication of an optical fiber interrogation instrumentation system." Thesis, University of Ottawa (Canada), 2007. http://hdl.handle.net/10393/27558.

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The design and fabrication of an optical Fiber Interrogation Instrumentation System is studied in this thesis. The objective is to design a Fiber Bragg Grating Interrogation (FBGI) instrumentation system using a Fiber Fabry Perot Tunable Filter (FFP-TF). An FBGI instrumentation system is designed to monitor the back-reflected wavelength shifts from a Distributed Fiber Bragg Grating (DFBG) network and to interpret those wavelength shifts into environmental temperature, strain and pressure variations. This thesis encapsulates the complete system development lifecycle, inclusive of an applied cas
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17

Alrawashdeh, Rula. "Implantable antennas for biomedical applications." Thesis, University of Liverpool, 2015. http://livrepository.liverpool.ac.uk/2010435/.

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Recently, the interest in implantable devices for biomedical telemetry has significantly increased. Amongst the different components of the implantable device, the antenna plays the most significant role in the wireless data transmission. However, the human body around the antenna alters its overall characteristics and absorbs most of its radiation. Therefore, this thesis is mainly focused on improving the antenna characteristics (bandwidth and radiation efficiency) to overcome the human body effect and investigating new structures that reduce the power absorption by the human body tissues. A
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18

Aamoth, Kelsey. "Instrumentation and Control System to Quantify Colonic Activity." Case Western Reserve University School of Graduate Studies / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=case1459190138.

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19

Lammi, Matthew. "Student Achievement and Affective Traits in Electrical Engineering Laboratories Using Traditional and Computer-Based Instrumentation." DigitalCommons@USU, 2008. https://digitalcommons.usu.edu/etd/228.

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Distance education has the ability to transcend distance and time, reaching students anywhere at any time, particularly those underrepresented in engineering. Engineering is a practice-oriented profession requiring an interweaving of scientific theory and applied hands-on activities. Despite the need for distance education in engineering, few studies have systematically investigated the impact of student achievement and attitude in distance engineering laboratories. This quasi-experimental research addressed that need by studying the cognitive and affective domains of achievement in engineerin
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20

Weiss, Martin. "Computer assisted audiometric evaluation system." Master's thesis, University of Cape Town, 1991. http://hdl.handle.net/11427/25671.

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A computer-based audiometric evaluation system has been developed. The system makes use of an IBM PC/XT/AT compatible personal computer to perform pure tone and speech tests and · comprises a plug-in card and custom software. The card contains pure tone and masking noise generators, together with amplifiers for a. set of headphones .and bone conduction transducer, patient and audiologist microphone amplifiers and a hand-held infra-red remote-control unit. A voice-operated gain-adjusting device on the audiologist's microphone eliminates the need for a sound pressure level meter during speech te
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21

Matherson, Kevin James. "Design, development, and analysis of semiconductor-based instrumentation for nuclear medicine." Diss., The University of Arizona, 2003. http://hdl.handle.net/10150/280432.

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Nuclear medicine imaging using a gamma camera is a sensitive tool for mapping various physiological and biological processes in vivo. In some respects, the instrumentation for gamma-ray imaging is highly developed. Nevertheless, current technology in nuclear medicine has some significant limitations in the area of spatial resolution. Scintillator-based imaging systems most likely have reached their limits of spatial resolution. Achieving higher spatial resolution will require the use of semiconductor detectors. The first part and major focus of this dissertation is the development of a prototy
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22

Cronjé, Thomas Frederick. "A plethysmographic device for determining human body volume and body density." Master's thesis, University of Cape Town, 1992. http://hdl.handle.net/11427/27150.

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The measurement of total body volume (V) (excluding lung volume) together with total body mass (m) is required in order to determine body density (d = m/V). From this, and using certain simplifying assumptions, it is possible to derive body composition in terms of fat mass (FM) and fat free mass (FFM) for the two-compartment model. The standard method for determining body volume (and hence body composition) is the densitometric (underwater weighing) technique based on Archimedes' principle. Three variables, notably residual lung volume (RV), total body mass (m) and submerged body mass are meas
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23

Tang, Selina Vi Yu. "Synthesis of nanomaterials for biomedical applications." Thesis, University of Nottingham, 2014. http://eprints.nottingham.ac.uk/14101/.

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The field of nanotechnology is growing vastly, both as a field of research and in commercial applications. This rapid growth calls for synthesis methods which can produce high quality nanomaterials, while being scalable. This thesis describes an investigation into the use of a continuous hydrothermal reactor for the synthesis of nanomaterials, with potential use in three different biomedical applications – bone scaffolds, fluorescent biomarkers, and MRI contrast agents. The first chapter of this thesis provides an overview of nanotechnology: the advantages of nanoscale, the commercial industri
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24

Esfahani, Siavash. "Electronic nose implementation for biomedical applications." Thesis, University of Warwick, 2018. http://wrap.warwick.ac.uk/108881/.

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The growing rate of diabetes and undiagnosed diabetes related diseases is becoming a worldwide major health concern. The motivation of this thesis was to make use of a technology called the ‘electronic nose’ (eNose) for diagnosing diseases. It presents a comprehensive study on metabolic and gastro-intestinal disorders, choosing diabetes as a target disease. Using eNose technology with urinary volatile organic compounds (VOCs) is attractive as it allows non-invasive monitoring of various molecular constituents in urine. Trace gases in urine are linked to metabolic reactions and diseases. Theref
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25

Manjunath, Sandeep. "Near-field baseband communication system for use in biomedical implants." Thesis, University of Glasgow, 2009. http://theses.gla.ac.uk/1128/.

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This thesis introduces the reader to the near-field baseband pulse radio communication for biomedical implants. It details the design and implementation of the complete communication system with a particular emphasis on the antenna structure and waveform coding that is compatible with this particular technology. The wireless communication system has great employability in small pill-sized biomedical diagnostic devices offering the advantages of low power consumption and easy integration with SoC and lab-in-a-pill technologies. The greatest challenge was the choice of antenna that had to be mad
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26

Black, Fiona E. "The characterisation and interactions of biomedical polymers." Thesis, University of Nottingham, 1999. http://eprints.nottingham.ac.uk/29655/.

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As the world population grows and the standard of living increases a need for better health care is an important consideration. Over the latter half of this century the use of polymeric materials within the field of medicine has grown considerably. This thesis investigates a variety of novel polymers whose applications within the medical field are both important and varied. In the cases studied, as with other polymeric materials intended for medicinal uses, the interaction with their surfaces is important, as when placed in the body the surface is the first place of contact and hence interacti
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27

Blakey, Richard Thomas. "Development of dielectric spectroscopic resonant sensors for biomedical and industrial applications." Thesis, Liverpool John Moores University, 2014. http://researchonline.ljmu.ac.uk/4598/.

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This research entailed the development of resonant dielectric sensors that utilising alternating electric fields at microwave frequencies. Characterisation and identification of biological samples is currently an expensive and time consuming procedure due to the extreme variation of seemingly similar biological systems. The work describes the development of resonant dielectric sensors for five distinct applications. The aim of the research was to develop non-invasive, affordable and compact dielectric spectroscopy sensors that may be used in-situ to characterise organic and biological systems.
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Klein, Justin Shaun. "Cerenkov Luminescence for Imaging and Therapy| Quantitative Investigation of Clinical Applications and New Instrumentation." Thesis, University of California, Davis, 2017. http://pqdtopen.proquest.com/#viewpdf?dispub=10606959.

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<p> Cerenkov luminescence (CL) is optical radiation induced by fast, charged, particles. In the biomedical setting, it is produced by all PET radionuclides and by radiotherapy beams.</p><p> The work presented in this dissertation, spanning some five years, has sought to both investigate the utility of Cerenkov luminescence imaging (CLI) in the biomedical setting and to push the boundaries by inventing ultrasound-modulated Cerenkov luminescence imaging (USCLI), a modality that potentially mitigates the scattering limit of resolution for CLI. </p><p> Clinical applications of CLI have focused
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Huisman, Maximiliaan. "Vision Beyond Optics: Standardization, Evaluation and Innovation for Fluorescence Microscopy in Life Sciences." eScholarship@UMMS, 2019. https://escholarship.umassmed.edu/gsbs_diss/1017.

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Fluorescence microscopy is an essential tool in biomedical sciences that allows specific molecules to be visualized in the complex and crowded environment of cells. The continuous introduction of new imaging techniques makes microscopes more powerful and versatile, but there is more than meets the eye. In addition to develop- ing new methods, we can work towards getting the most out of existing data and technologies. By harnessing unused potential, this work aims to increase the richness, reliability, and power of fluorescence microscopy data in three key ways: through standardization, evaluat
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30

Jin, Xiaoxia. "Investigation of Intrinsic Cell Magnetophoresis for Label-Less Cell Separation and Analysis and the Optimization of the CTV Instrumentation for Such Studies." The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1268002273.

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31

Hossain, Abu. "Virtual reality simulation modeling for tele-surgery and tele-haptic class of applications." Thesis, University of Ottawa (Canada), 2006. http://hdl.handle.net/10393/27252.

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The incorporation of Haptic interfaces in Collaborative Virtual Environments (CVE) suffers from setbacks due to an inherent technical problem that occurs when the users are geographically distributed. The main causes of such discrepancies are network delay, a lack of view of individual participants' activities, and haptic feedback . Although some strategies exist for dealing with these concerns, they do not adequately address reality, causality, or the sense of co-presence in CVEs during closely coupled haptic tasks. In this thesis, an approach based on both decorators and prediction to compen
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Hamam, Abdelwahab. "A three-dimensional haptic cataract tele-surgery simulation." Thesis, University of Ottawa (Canada), 2007. http://hdl.handle.net/10393/27519.

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Medical simulations are becoming more advanced and more reliable in training medical students and new surgeons. Especially in the context of delicate surgeries, such as cataract surgery, the medical community is shifting from traditional medical training to sophisticated virtual reality simulations. In this thesis, we present a simulation built in a three-dimensional environment that aids in training medical residents to perform cataract surgeries. The application utilizes haptic devices as a means of interaction, which enriches the application by providing a sense of touch and force-feedback
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33

Luo, Zhengwei. "Beamforming for binaural hearing aids." Thesis, University of Ottawa (Canada), 2009. http://hdl.handle.net/10393/28170.

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Binaural hearing aids making use of a wireless link are becoming a trend in hearing-aids design. However, it is still not clear how much gain can be obtained in complex real-life acoustic environments when using binaural hearing aids compared to monaural ones, and whether binaural hearing aids are worth the additional effort and complexity. This thesis aims to provide some answers to this question. In particular, it will compare the performance of different microphone array configurations, study the effects of using different head models for fixed beamforming design, assess the effect of head
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Ahmadi, Mohsen. "Design and construction of a high-bandwidth computer controlled rotary vane ventilator." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq55293.pdf.

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35

Murphy-Perez, Eduardo. "Vapor-Liquid-Solid (VLS) Grown Silica (SiOx) Nanowires as the Interface for Biorecognition Molecules in Biosensors." Thesis, University of South Florida, 2013. http://pqdtopen.proquest.com/#viewpdf?dispub=3558205.

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<p> SiO<sub>x</sub> nanowires grown through the VLS mechanism were electrophoretically deposited on top of Au electrodes. GO<sub>x</sub> was immobilized using APTES and the EDC-NHS chemistry. Cyclic Voltammetry was used as the method to characterize the electrodes through their processing steps, and CV was also used to detect glucose in a PBS based solution. Ferro-Ferri Cyanide couple was used as the mediator.</p>
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Wang, Bing 1966. "Measurement of the evoked vascular response to cerebral activation with PET." Thesis, McGill University, 1997. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=34685.

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A technique to measure the evoked vascular response in the human brain has been developed for a Scanditronix PC2048-15B PET scanner. New hardware and software have been designed to enable the scanner to acquire image data in 8 distinct segments of the acquisition memory sequentially and repetitively when gated by an auxiliary signal. For PET activation studies, these modifications facilitate the application of a stimulation pattern consisting of 8 phases. By synchronizing the phases with the acquisition, the time course of the response to the stimulation is measured. Simulation and phantom tes
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Shah, Samir. "An adaptive model of information processing in the primate retina /." Thesis, McGill University, 1993. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=68050.

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At the retinal level, the strategies utilized by biological visual systems allow then to outperform machine vision systems, serving to motivate the design of electronic or "smart" sensors based on similar principles. Design of such sensors in silicon first requires a model of retinal information processing which captures the essential features exhibited by biological retinas. In this thesis, a simple retinal model is presented, which qualitatively accounts for the achromatic information processing in the primate cone system. The computer retina model exhibits many of the properties found in bi
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Yien, Chris Tak Ming. "Vital signs monitoring for a patient data management system in an ICU." Thesis, McGill University, 1993. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=69721.

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This thesis presents the design and implementation of a Vital Signs Monitoring System for a Patient Data Management System in an intensive care unit. The Vital Signs Monitoring System provides graphical display of patient data to assist medical decision making. It performs real-time patient data acquisition, and supports data management. Visual coding of information has been investigated to ensure effective graphical representation of patient data, to reduce screen clutter, and to enhance interpretability of graphical displays. A survey of existing patient monitoring systems, and patient data
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Hosseinzadeh, Abolfazl. "A rule-based system for vital sign monitoring in intensive care." Thesis, McGill University, 1993. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=26110.

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The implementation of a knowledge-based expert system to check on inpatients' conditions is described. In our development of a bedside computerized ICU, graphical user interface (GUI) and graphical visualization have been extensively exploited to facilitate the natural and effective representation of clinical information for patient care, the transition from the manual system to computerized system and users interaction with the system. The input comprises the heart rates, the blood pressures, and the central venous pressures of several inpatients.<br>The algorithm is made up of two parts. The
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Cova, Armando C. (Armando Carlos). "A bilateral model for coordinated conjugate and vergence eye movements /." Thesis, McGill University, 1992. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=56810.

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Traditionally, the Oculomotor Control System (OCS) has been considered as composed of several independent subsystems acting in parallel, where each dedicated subsystem controls a particular type of conjugate or disjunctive eye movement. Previous mathematical models built upon this assumption have mainly focused on input-output relationships, being difficult to relate to anatomy. This fact may limit the application of such models in the clinical environment. A new integrated approach for the modelling of the OCS is proposed, compatible with both known anatomy and physiology. This study presents
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Yong, Stephen. "An algorithm to recover the left-ventricular intracardiac second heart sound from externally recorded phonocardiograms /." Thesis, McGill University, 1990. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=59601.

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Heart sounds recorded on the surface of the thorax can be significantly distorted due to the varying properties of the transmission paths between the heart chambers and body surface. For diagnostic purposes, it is desirable to obtain the sounds at the source. In this thesis, an algorithm has been developed to recover the left-ventricular component of the second heart sound from externally recorded phonocardiograms. The algorithm uses a model of the heart-thorax system and is derived from deconvolution techniques developed for analogous problems in speech processing and seismology. The algorith
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Madden, Peter Geoffrey Alexander. "Construction of a digitally controlled scanning tunneling microscope." Thesis, McGill University, 1996. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=24066.

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The development of micro- and nano-scale robots for medical applications will require an understanding and intuition for nanoscale phenomena as well as a suite of new miniaturized technologies. The scanning tunneling microscope (STM), invented in 1980 by Gerd Binnig and Heinrich Rohrer at IBM, and related scanning probe microscopes such as the atomic force microscope are among the most advanced instruments yet built to explore our world at the nanometer and even subnanometer level. This thesis describes the construction of a computer controlled scanning tunneling microscope, the characterizati
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Day, Jennifer L. "Finite-element modelling of the fluid-structure interaction between the ear canal and eardrum." Thesis, McGill University, 1990. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=60036.

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In this work mathematical modelling methods are formulated in order to examine how sound pressures in the ear canal interact with displacements on the eardrum. Existing finite-element code is altered and new code developed to deal with the acoustics of the ear canal and the mathematics of the fluid-structure interaction problem. A finite-element model of the human ear canal and eardrum using simplified geometry is developed as an initial approach to the coupled problem. The preliminary finite-element model consists of a cylindrical tube attached to a circular plate, with appropriate material p
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Clancy, Raymond Lecours. "A simple technique to improve the linearity and field-of-view of crossed anode wire position sensitive photomultiplier tubes /." Thesis, McGill University, 1998. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=21285.

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Crossed anode wire position sensitive photomultiplier tubes (PS-PMTs) detect the location of a light source and provide the X and Y coordinates of the events. These coordinates are typically generated using Anger logic, where a resistor chain divides the current flow into two signals for each coordinate (X+, X-, & Y +, Y-). In the standard readout, identical resistor values are used across the entire resistor chain. While this arrangement provides a linear readout in the central portion of the photomultiplier face, the readout is non-linear and sometimes even double valued near the edges of th
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MacDonald, Brennan A. "Surface charge characteristics of a radio-charged electret." Thesis, McGill University, 1990. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=60430.

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Measurements of charge distributions across the face of isothermally, radio-charged polymer electrets are presented. The electret forming chamber is comprised of a parallel-plate ionization chamber in which the collecting electrode is covered by a dielectric (Teflon, Mylar). Charging is accomplished by the simultaneous application of electric potential and ionizing radiation to the chamber. The electret can be discharged by removing the external potential during further irradiation. For these studies the electrets are scanned with an electrostatic voltmeter probe yielding digitized maps of the
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46

Hulsey, Robert W. "Multiple frequency microwave ablation." Thesis, Mississippi State University, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=1586972.

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<p> In recent years, microwave ablation therapy has become widely investigated as an alternative treatment to cancer. This method is one of the newest forms of ablation techniques for the removal of tumors and is minimally invasive compared to alternative treatments. One drawback to many of the current microwave ablation systems is the narrowband nature of the antennas used for the probe, such as dipole antennas. This study aims to compare ablation results of both ultra-wideband and narrowband ablation techniques. An ultra-wideband ablation probe is designed that operates from 400
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Eslava, Rios Javier. "Automatic melanoma detection in dermatological images." Thesis, California State University, Long Beach, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=1582857.

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<p> Malignant melanoma is one of the most dangerous types of skin cancer. A very important aspect of this type of cancer is that, if detected early, it can be completely removed from the body. These characteristics make the research on automated melanoma detection systems a field with high potential. In this thesis, a system for automatic detection of melanoma is designed, developed and studied. The system is composed of five stages; image acquisition, illumination correction, lesion segmentation, feature extraction and classification. The techniques implemented in illumination correction are
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48

Tu, Jidong 1964. "The simulation of bidirectional ultrasound hyperthermia treatments of neck tumors." Thesis, The University of Arizona, 1992. http://hdl.handle.net/10150/278165.

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The temperature distributions produced in neck tumors by using either a single, scanned transducer (a unidirectional scan) or two separate transducers whose axis were perpendicular (a bidirectional scan) were simulated. The three dimensional neck model included separate anatomical regions for the normal neck muscle tissue, the tumor, the spinal column and the trachea. The effects of variations in the transducer frequency and f-number, the tumor size and location, and the normal and tumor blood perfusion rates were established. The results indicate that the best temperature distributions will b
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Song, Jun. "Point-of-Care Systems for Cellular Analysis." Thesis, Harvard University, 2015. http://nrs.harvard.edu/urn-3:HUL.InstRepos:14226047.

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Cellular analysis is a vital part of diagnostics testing for most diseases. The development of modern technologies has led to great advancement in this task. However, the use of cellular analysis systems is limited mainly to laboratories and clinics due to their high cost and large size. Providing affordable and accessible diagnostic testing to the majority of population in the developing world and resources-limited regions remains a technical challenge. To overcome this challenge, cost-effective and portable point-of-care (POC) systems have emerged in recent years as a priming approach. This
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Dorr, Lisa Nancy 1960. "An in vivo study of variations in local power absorption in high temperature ultrasound hyperthermia." Thesis, The University of Arizona, 1990. http://hdl.handle.net/10150/277277.

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The purpose of this research was to investigate temperature elevation variations caused by tissue location, tissue interfaces, and large blood vessels through a series of in vivo experiments using high power ultrasonic pulses. Results show that high temperature ultrasound hyperthermia does not suffer extensively from the tissue heterogeneities and even tissues within a few millimeters from an artery could be adequately exposed. Experimental results were compared with the temperature distributions predicted with computer simulations. The computer model studies indicate that matching simulated s
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