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Tesis sobre el tema "Physics-guided"

Autor: Grafiati
Publicado: 25 de mayo de 2024
Última modificación: 31 de julio de 2025

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1

Brandão, Eduardo. "Complexity Methods in Physics-Guided Machine Learning." Electronic Thesis or Diss., Saint-Etienne, 2023. http://www.theses.fr/2023STET0062.

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La complexité est facile à reconnaître mais difficile à définir : il existe de nombreuses mesures de complexité, chacune pertinente pour une application particulière.Dans le domaine de l'ingénierie des surfaces, l'auto-organisation entraîne la formation de motifs sur la matière par irradiation laser femtoseconde, ce qui a d'importantes applications biomédicales. Les détails de la formation des motifs ne sont pas entièrement compris. Dans des travaux menant à deux publications [1,2], grâce à un argument de complexité et un cadre d'apprentissage automatique guidé par la physique, nous montrons q
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2

Lynn, Hermes B. "Guided inquiry using the 5E instructional model with high school physics." Montana State University, 2012. http://etd.lib.montana.edu/etd/2012/lynn/LynnH0812.pdf.

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My project focused on the effectiveness of guided inquiry strategies to help students learn physics. Physics is a subject which lends itself to inquiry teaching, where students discover the answers to scientific questions rather than being told the answer. The study involved twelve high school physics students. Student interviews, surveys, and conceptual assessments were used to gauge the effectiveness of this teaching strategy. I collected data and compared two treatment units (inquiry) to a nontreatment unit (traditional). Results were expressed as a percent change in student learning. I als
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3

Shahdi, Arya. "Physics-guided Machine Learning Approaches for Applications in Geothermal Energy Prediction." Thesis, Virginia Tech, 2021. http://hdl.handle.net/10919/103603.

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In the area of geothermal energy mapping, scientists have used physics-based models and bottom-hole temperature measurements from oil and gas wells to generate heat flow and temperature-at-depth maps. Given the uncertainties and simplifying assumptions associated with the current state of physics-based models used in this field, this thesis explores an alternate approach for locating geothermally active regions using machine learning methods coupled with physics knowledge of geothermal energy problems, in the emerging field of physics-guided machine learning. There are two primary contribution
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4

Pizzati, Fabio <1993&gt. "Exploring domain-informed and physics-guided learning in image-to-image translation." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2022. http://amsdottorato.unibo.it/10499/1/pizzati_fabio_tesi.pdf.

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Image-to-image (i2i) translation networks can generate fake images beneficial for many applications in augmented reality, computer graphics, and robotics. However, they require large scale datasets and high contextual understanding to be trained correctly. In this thesis, we propose strategies for solving these problems, improving performances of i2i translation networks by using domain- or physics-related priors. The thesis is divided into two parts. In Part I, we exploit human abstraction capabilities to identify existing relationships in images, thus defining domains that can be leveraged t
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5

Guisti, Brett M. "Comparison of Guided and Open Inquiry Instruction in a High School Physics Classroom." Diss., CLICK HERE for online access, 2008. http://contentdm.lib.byu.edu/ETD/image/etd2572.pdf.

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6

Baloyi, Vonani Michael. "Influence of guided inquiry-based laboratory activities on outcomes achieved in first-year physics." Thesis, University of Pretoria, 2017. http://hdl.handle.net/2263/62910.

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In this study, the effect of ‗explicit reflective guided inquiry‘ (ERGI) laboratory practical activities on first-year physics students‘ understanding of nature of science (NOS) and academic performance is investigated. Ninety seven students participated in the study and were systematically assigned to the control group that did recipe-based practical activities and the experimental group that did ERGI laboratory practical activities. Both groups had to answer the same explicit reflective questions on an aspect of NOS at the end of each practical session. Data were collected using the VNOS For
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7

Karunanayaka, Prasanna Rasika. "A Dispersion Formula for Analyzing Modal Interference Among Guided and Free Electromagnetic Wave Modes and Other Phenomena in a Circular Optical Fiber." University of Cincinnati / OhioLINK, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1100844976.

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8

Mithani, Murad A. "The Development and Marketing of an Online Guided Study Program for the GRE Physics Exam Towards an Understanding of Future Instructional Methodologies." Case Western Reserve University School of Graduate Studies / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=case1225102470.

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9

Zhao, Zhiling. "The Response of O(1S) and OH Emission Brightness to Gravity Wave Perturbations." University of Cincinnati / OhioLINK, 2001. http://rave.ohiolink.edu/etdc/view?acc_num=ucin989251411.

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10

Djordjevic, Milos. "Evaluation of Geometric Accuracy and Image Quality of an On-Board Imager (OBI)." Thesis, Stockholm University, Medical Radiation Physics (together with KI), 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-6967.

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<p>In this project several tests were performed to evaluate the performance of an On-Board Imager® (OBI) mounted on a clinical linear accelerator. The measurements were divided into three parts; geometric accuracy, image registration and couch shift accuracy, and image quality. A cube phantom containing a radiation opaque marker was used to study the agreement with treatment isocenter for both kV-images and cone-beam CT (CBCT) images. The long term stability was investigated by acquiring frontal and lateral kV images twice a week over a 3 month period. Stability in vertical and longitudinal ro
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11

Madonia, Rosalia [Verfasser], Dr Kraus Ute [Akademischer Betreuer] Prof, and Dr Grabmayr Peter [Gutachter] Prof. "A Nature of Science guided approach to the physics teaching of Cosmic Rays / Rosalia Madonia ; Gutachter: Peter Prof. Dr. Grabmayr ; Betreuer: Ute Prof. Dr. Kraus." Hildesheim : Universität Hildesheim, 2019. http://d-nb.info/1202921086/34.

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12

Robertson, Scott. "Automatic Block-Matching Registration to Improve Lung Tumor Localization During Image-Guided Radiotherapy." VCU Scholars Compass, 2013. http://scholarscompass.vcu.edu/etd/3067.

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To improve relatively poor outcomes for locally-advanced lung cancer patients, many current efforts are dedicated to minimizing uncertainties in radiotherapy. This enables the isotoxic delivery of escalated tumor doses, leading to better local tumor control. The current dissertation specifically addresses inter-fractional uncertainties resulting from patient setup variability. An automatic block-matching registration (BMR) algorithm is implemented and evaluated for the purpose of directly localizing advanced-stage lung tumors during image-guided radiation therapy. In this algorithm, small
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13

Lundström, Robin. "Machine Learning for Air Flow Characterization : An application of Theory-Guided Data Science for Air Fow characterization in an Industrial Foundry." Thesis, Karlstads universitet, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-72782.

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In industrial environments, operators are exposed to polluted air which after constant exposure can cause irreversible lethal diseases such as lung cancer. The current air monitoring techniques are carried out sparely in either a single day annually or at few measurement positions for a few days.In this thesis a theory-guided data science (TGDS) model is presented. This hybrid model combines a steady state Computational Fluid Dynamics (CFD) model with a machine learning model. Both the CFD model and the machine learning algorithm was developed in Matlab. The CFD model serves as a basis for the
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14

Boye, Robert Russell. "Physical optics approach to guided-mode resonance filters." Diss., The University of Arizona, 2000. http://hdl.handle.net/10150/284141.

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This dissertation develops a theoretical framework for guided mode resonance filters (GMRFs) with surface relief gratings based on a physical optics approach. A GMRF is a unique optical device that utilizes the resonance due to the coupling of a diffraction order of a grating with a waveguide mode. This coupling process leads to rapid fluctuations in the reflected and transmitted fields from the GMRF. The reflected output can change from 0% to 100% over extremely small wavelength (or angular) regions with a Lorentzian lineshape. It is shown that the surface relief gratings can be effectively m
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15

Al-Jibouri, Khalid Ibrahim G. "Electromagnetic linear surface guided modes and plasmon couplers." Thesis, University of Salford, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.304494.

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16

Pile, David Fujio Pelleas. "Extremely asymmetrical scattering of waves in periodic Bragg arrays." Thesis, Queensland University of Technology, 2003. https://eprints.qut.edu.au/15794/1/David_Pile_Thesis.pdf.

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This thesis fills in the gaps in the existing theory of wave phenomena in thick diffraction gratings at extreme angles of scattering, i.e. when the scattered wave propagates parallel or almost parallel to the grating boundaries. A consistent theory of a new type of Bragg scattering of bulk and guided optical modes in thick uniform and non-uniform, dissipative and non-dissipative, slanted periodic gratings has been developed. This type of scattering is called extremely asymmetrical scattering (EAS). One of the main distinctive features of EAS is the strong resonant increase of the scatter
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17

Pile, David Fujio Pelleas. "Extremely asymmetrical scattering of waves in periodic Bragg arrays." Queensland University of Technology, 2003. http://eprints.qut.edu.au/15794/.

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This thesis fills in the gaps in the existing theory of wave phenomena in thick diffraction gratings at extreme angles of scattering, i.e. when the scattered wave propagates parallel or almost parallel to the grating boundaries. A consistent theory of a new type of Bragg scattering of bulk and guided optical modes in thick uniform and non-uniform, dissipative and non-dissipative, slanted periodic gratings has been developed. This type of scattering is called extremely asymmetrical scattering (EAS). One of the main distinctive features of EAS is the strong resonant increase of the scatter
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18

Barnes, W. L. "Guided optical waves in Langmuir-Blodgett films of 22-tricosenoic acid." Thesis, University of Exeter, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.374945.

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19

Dyess, Amanda. "Patient dose verification for image-guided radiation therapy using a deformable registration tool." Thesis, McGill University, 2013. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=117187.

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Patient geometry often changes during the course of radiation therapy due to factors such as weight loss, tumor and normal tissue growth or shrinkage, and intra-treatment position variations. It has been shown that these changes can cause the dose delivered to differ from the originally planned dose distribution. Often this will result in the need to create a modified treatment plan, a process known as adaptive radiation therapy. The aim of this thesis is to evaluate the dosimetric effects due to anatomical changes and positioning variations during intensity-modulated radiation therapy through
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20

Urthaler, Stephanie. "Tränas förmågorna i ämnet fysik? : En innehållsanalys av lärarnas planeringar, LPP:er samt hur lärarna övar förmågorna med eleverna i ämnet fysik." Thesis, Södertörns högskola, Lärarutbildningen, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:sh:diva-33978.

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Abstract - Which abilities are the students training in the subject of physics? The purpose of this study was to examine teachers' plans, LPPs (Local Educational Planning) to see which abilities are trained and how. I have created a content analysis of the teachers' plans, LPPs and how the teachers practice the abilities of the students in the subject of physics. I analysed two LPPs in the grade 5 and two LPPs in the grade 6. The LPPs are from two different schools and two teachers' one in each grade. My first purpose was to examine which abilities, prescribed in Lgr 11 students are training a
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21

Déchelle-Marquet, Marie. "Deep learning based physical-statistics modeling of ocean dynamics." Electronic Thesis or Diss., Sorbonne université, 2023. https://theses.hal.science/tel-04166816.

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La modélisation des phénomènes dynamiques en géophysique repose sur une compréhension de la physique sous-jacente, décrite sous la forme d'EDP, et sur leur résolution par des modèles numériques. Le nombre croissant d'observations de systèmes physiques, l'essor récent de l'apprentissage profond et l'énorme puissance de calcul requise par les solveurs numériques, qui entrave la résolution des modèles existants, suggèrent que l'avenir des modèles physiques pourrait être orienté données. Mais pour cela, l'apprentissage profond doit relever plusieurs défis, tels que l'interprétabilité et la cohéren
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22

Hudson, Jason. "Image-Guided Adaptive Radiation Therapy: Retrospective Study and Assessment of Clinical Workflow." University of Toledo Health Science Campus / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=mco1372268939.

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23

Liang, Li Heng. "Statistical analysis and biological effects of prostate motion in ultrasound image-guided external beam radiotherapy." Thesis, McGill University, 2004. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=81359.

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Biological effects and prostate motion were studied for prostate cancer patients treated with external beam radiotherapy. The prostate motion was determined using an ultrasound-based patient positioning system (BAT: B-mode Acquisition and Targeting) just after conventional patient setup. The changes in planned biological effects due to prostate motion were calculated for the prostate target organ and for the rectum and bladder normal tissues using TCP (tumor control probability) and NTCP (normal tissue complication probability) calculations, respectively. The prostate TCP calculations w
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24

Timm, Noé Ricardo. "Física Moderna e Contemporânea e a Saúde: uma proposta envolvendo energia nuclear e radioatividade na formação inicial de professores de física." Universidade Federal de Santa Maria, 2012. http://repositorio.ufsm.br/handle/1/6664.

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The insertion of Modern and Contemporary Physics (FMC) in High School (IN) supported by researchers from the School of Sciences and Physical Education is linked to a concern with the initial training and continuing education. In this paper, we present results of research through an undergraduate Supplementary Discipline (DCG), the initial training of teachers, aiming at achieving the contents of FMC Health and cross-cutting theme in the planning of teaching undergraduates in physics. The implementation of this discipline occurred in the 2nd half of 2011, the degree course in Physics UFSM. To p
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25

Fraser, Danielle. "Image guided radiation therapy applications for head and neck, prostate, and breast cancers using 3D ultrasound imaging and Monte Carlo dose calculations." Thesis, McGill University, 2010. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=95017.

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In radiation therapy an uncertainty in the delivered dose always exists because anatomic changes are unpredictable and patient specific. Image guided radiation therapy (IGRT) relies on imaging in the treatment room to monitor the tumour and surrounding tissue to ensure their prescribed position in the radiation beam. The goal of this thesis was to determine the dosimetric impact on the misaligned radiation therapy target for three cancer sites due to common setup errors; organ motion, tumour tissue deformation, changes in body habitus, and treatment planning errors. For this purpose, a nove
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26

Jakobsson, Elvis. "Topology-guided analysis and visualization of charge density fields." Thesis, Linköpings universitet, Institutionen för fysik, kemi och biologi, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-157771.

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Direct volume rendering techniques for scalar fields make use of transfer functions to map optical properties to the field; the field can subsequently be visualized through the drawing of isosurfaces in the volume spanned by the field. The utility of this approach is limited in the case of nested or clustered structures with the same isovalue and further does not easily allow for quantitative measurements of the visualized data. This report explores the use of topological structures (contour trees and Morse-Smale complexes) as an augmentation of traditional direct volume rendering and describe
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27

Ramanujam, Nandakumar 1966. "Analysis and design of optical guided-wave devices for quasi-phasematched second harmonic generation and Bragg deflection." Diss., The University of Arizona, 1997. http://hdl.handle.net/10150/282317.

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Integrated optics-based approaches to beam steering, beam shaping, beam collimation, and quasi-phasematched (QPM) second harmonic generation (SHG) of light offer significant advantages over conventional approaches based on bulk optics. The research in this dissertation addresses the analysis and design of optical guided-wave devices for both efficient quasi-phasematched second harmonic generation in diffused channel waveguides, as well as Bragg deflection of beams in planar waveguides. It is known that the normalized SHG efficiency depends on the linear properties of the waveguide through the
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28

Lindskog, Maria. "Clinical Investigations of Image Guided Radiation Therapy for Prostate Cancer with an On-Board Imager." Thesis, Stockholm University, Medical Radiation Physics (together with KI), 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-8320.

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<p>The daily uncertainty concerning tumor localization is one of the major problems during the course of radiation therapy. Image guided-radiation therapy (IGRT) can be used to improve the localization and adjustment of the planning target volume. The aim of this work was to evaluate both the IGRT technique used for prostate cancer patients at the department of the Karolinska University Hospital and an alternative on-line adaptive radiation therapy (ART) method with an On-Board Imager (OBI).</p><p>In the first part of the thesis 2D and 3D image registration with an OBI were compared. Ten prost
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29

Mark, Clarisse Ildikó. "Image-guided radiotherapy using 2D and 3D ultrasound combined with Monte Carlo dose calculations in prostate treatments." Thesis, McGill University, 2005. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=98761.

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Two ultrasound systems were studied to investigate the effects of positional and volumetric prostate variations on dosimetry over the course of external radiation therapy. A 2D system, currently used at the Montreal General Hospital for patient repositioning, was compared to a 3D system invented recently. Prostate variations were quantified from ultrasound images acquired daily during a 2003 clinical study. A method was devised to introduce ultrasound information in a Monte Carlo Treatment Planning System previously developed at McGill. Patient repositioning was evaluated for both systems usin
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30

Crnkic, Edin. "Geometry guided phase transition pathway and stable structure search for crystals." Thesis, Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/44760.

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Recently a periodic surface model was developed to assist geometric construction in computer-aided nano-design. This implicit surface model helps create super-porous nano structures parametrically and support crystal packing. In this thesis, a new approach for pathway search in phase transition simulation of crystal structures is proposed. The approach relies on the interpolation of periodic loci surface models. Respective periodic plane models are reconstructed from the positions of individual atoms at the initial and final states, and surface correspondence is found using a Simulated Anneali
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31

Abuhaimed, Abdullah Abdulaziz. "Dosimetric investigations of Kilovoltage Cone Beam Computed Tomography (kV-CBCT) utilized in Image Guided Radiation Therapy (IGRT) using Monte Carlo simulations." Thesis, University of Glasgow, 2015. http://theses.gla.ac.uk/6751/.

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Many studies have shown that the computed tomography dose index (CTDI100) which is considered to be the main dose descriptor for CT dosimetry fails to provide a realistic reflection of the dose involved in cone beam CT (CBCT) scans. The main reason for this failure is that CTDI100 measurements are performed within standard head and body phantoms made of polymethyl methacrylate (PMMA) that are only 150 cm long, which is less than or similar to beam widths used for CBCT scans. Therefore, much of the scatter that would contribute to the dose received by a patient is not recorded. Several practica
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32

Hudin, Nicolas. "Développement de nouvelles sondes per-opératoires positon pour guider la chirurgie des tumeurs solides." Phd thesis, Université Paris Sud - Paris XI, 2013. http://tel.archives-ouvertes.fr/tel-00906756.

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L'exérèse des tumeurs cancéreuses est une procédure courante pour le traitement de nombreux cancers. L'enjeu est de réaliser une excision la plus complète possible pour éviter les récidives tout en épargnant le plus possible les tissus sains bordant la tumeur. La détection de positons est une modalité d'imagerie particulièrement adaptée au repérage de résidus tumoraux lors de l'éxerèse car sa forte sélectivité spatiale permet de s'affranchir du bruit provenant de la fixation non spécifique du radiotraceur dans les tissus situés en profondeur, offrant ainsi une meilleur sensibilité et un meille
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33

Kramar, Johanna. "Prostate brachytherapy: Pre-plan and real-time transperineal ultrasound guided Iodine-125 permanent seed implants at Södersjukhuset, Karolinska University Hospital." Thesis, Stockholm University, Medical Radiation Physics (together with KI), 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-8299.

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<p>Purpose: The aim of this thesis is to study the European (ESTRO/EAU/EORTC) and American (ABS) guidelines how to report the permanent seed implant and the most significant dosimetric parameters. It will also report on the permanent seed implant at Södersjukhuset, Karolinska University Hospital according to the guidelines. A large number of studies on pre- and post-implant dosimetry on permanent seed implants have recently been published but none is considered a standard. This makes it difficult, if not impossible, to compare data from different centres. The differences in reporting will also
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34

Detofsky, Abram Maximilian. "A multi-wavelength optical content-addressable parallel processor (MW-OCAPP) for high-speed relational database processing: Free-space experimental implementation and monolithic adaptation based on guided-wave technology." Thesis, The University of Arizona, 1999. http://hdl.handle.net/10150/291970.

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This thesis explores the five-space experimental implementation and monolithic adaptation of the Equality subsystem from a parallel relational database optical machine called the Multi-Wavelength Optical Content-Addressable Parallel Processor (MW-OCAPP). MW-OCAPP uses a novel polarization- and wavelength-encoding scheme to achieve an input/output-limited experimental peak bit comparison rate of 96,000/sec. Recognizing the severe diffraction-limit penalty for using a free-space optical processor with relatively long path lengths, a system based on guided-wave optics called the Equivalency Proce
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35

Guédra, Matthieu. "Etudes semi-analytiques des conditions de déclenchement et de saturation des auto-oscillations dans des moteurs thermoacoustiques de géométries diverses." Phd thesis, Université du Maine, 2012. http://tel.archives-ouvertes.fr/tel-00821108.

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Les moteurs thermoacoustiques sont des oscillateurs autonomes constitués d'un résonateur acoustique partiellement occupé par un matériau poreux (stack) soumis à un important gradient de température grâce à un apport de chaleur externe. Lorsque le gradient de température imposé le long du stack devient supérieur à un certain gradient critique, appelé seuil de déclenchement, l'interaction fluide-parois se traduit par l'amplification d'une onde acoustique auto-entretenue de fort niveau sur le mode le plus instable du résonateur. L'objet des travaux présentés dans ce mémoire est double. D'une part
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36

Baccouche, Yousra. "Caractérisation non linéaire de l'endommagement des matériaux composites par ondes guidées." Phd thesis, Université du Maine, 2013. http://tel.archives-ouvertes.fr/tel-00840424.

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La sensibilité des méthodes acoustiques non-linéaires à la présence ainsi qu'à l'évolution des microendommagements a été prouvée dans différents travaux sur une large gamme de matériaux. Parmi les méthodes appliquées figure la résonance non-linéaire dont la sensibilité à l'endommagement est prouvée pour un seul mode de vibration à travers la décroissance de la fréquence de résonance ƒ et celle facteur de qualité Q en fonction de la déformation dynamique. Ainsi, les paramètres non-linéaires hystérétiques (NLH) ƒ et Q ne sont connus que dans une gamme fréquentielle réduite. Le présent travai
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37

Chu, Hsiu-Yung, and 朱秀勇. "The Development of Computer Simulation Material Supporting Guided Discovery Learning Activities on Refraction in High School Physics Course." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/55186332914899165407.

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碩士<br>淡江大學<br>教育科技學系<br>89<br>The purpose of the study is to design and develop a web-based prototype courseware on optical refraction by ISD model. The Guided Discovery Learning Theory is the main instructional strategy used in the study. It is expected to increase student’s ability about thinking and understanding of nature phenomenon. The foundation of instructional strategy in the study is to use different kinds of scientific representation to help students realize the meaning of refraction equation. Through the example that reveals misconception, students are guided to understa
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38

Gurumurthy, C. "Comparative study of the effectiveness of guided discovery approach doing physics experiments versus instructed performance approach at Pre-University level." Thesis, 1988. http://hdl.handle.net/2009/2471.

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39

Chiew, Eng-Kok, and 周應郭. "The Influence of Guided Inquiry Teaching on 10 Graders’ Physics Concept Learning, Students' Learning Motivation and their Perceptions of Scientific Inquiry." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/2y5svm.

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碩士<br>國立彰化師範大學<br>科學教育研究所<br>106<br>This study aimed to use action research to carry out guided inquiry instruction in one 10 grader physics class in Malaysia, and explored the difficulties encountered in the implementation of inquiry teaching and the strategies for improvement by means of action research. In addition, researcher wanted to report the changes of students' motivation to physics, the learning of physics concept and understanding of students' view of scientific inquiry. One-year inquiry teaching were implemented in a class with 8 students, which was conducted in three stages. Prep
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40

Liu, Yilin. "Development and Optimization of Four-dimensional Magnetic Resonance Imaging (4D-MRI) for Radiation Therapy." Diss., 2016. http://hdl.handle.net/10161/12267.

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<p>A tenet of modern radiotherapy (RT) is to identify the treatment target accurately, following which the high-dose treatment volume may be expanded into the surrounding tissues in order to create the clinical and planning target volumes. Respiratory motion can induce errors in target volume delineation and dose delivery in radiation therapy for thoracic and abdominal cancers. Historically, radiotherapy treatment planning in the thoracic and abdominal regions has used 2D or 3D images acquired under uncoached free-breathing conditions, irrespective of whether the target tumor is moving or not.
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Morton, Daniel R. "Development of a software based automatic exposure control system for use in image guided radiation therapy." Thesis, 2013. http://hdl.handle.net/1828/4734.

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Modern image guided radiation therapy involves the use of an isocentrically mounted imaging system to take radiographs of a patient's position before the start of each treatment. Image guidance helps to minimize errors associated with a patients setup, but the radiation dose received by patients from imaging must be managed to ensure no additional risks. The Varian On-Board Imager (OBI) (Varian Medical Systems, Inc., Palo Alto, CA) does not have an automatic exposure control system and therefore requires exposure factors to be manually selected. Without patient specific exposure factors, image
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42

Rathod, Vivek T. "Ultrasonic Guided Wave Based Models, Devices and Methods for Integrated Structural Health Monitoring." Thesis, 2014. http://etd.iisc.ac.in/handle/2005/3054.

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Structural Health Monitoring (SHM) systems for future structures and vehicles would involve a process of damage identification and prediction of certain quantities of interest that concerns the function and safety. This process provides SHM systems the ability to not only save cost but also enhance the service life, safety and reliability of the structures and vehicles. Integrated SHM system (ISHM) is an advancement of SHM system that has additional capability of predicting the component life/failure. ISHM system development involves detailed understanding of diagnostic waves, hardware compone
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43

Rathod, Vivek T. "Ultrasonic Guided Wave Based Models, Devices and Methods for Integrated Structural Health Monitoring." Thesis, 2014. http://hdl.handle.net/2005/3054.

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Structural Health Monitoring (SHM) systems for future structures and vehicles would involve a process of damage identification and prediction of certain quantities of interest that concerns the function and safety. This process provides SHM systems the ability to not only save cost but also enhance the service life, safety and reliability of the structures and vehicles. Integrated SHM system (ISHM) is an advancement of SHM system that has additional capability of predicting the component life/failure. ISHM system development involves detailed understanding of diagnostic waves, hardware compone
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44

Mazur, Thomas Rolf. "Magnetically activated and guided isotope separation." Thesis, 2014. http://hdl.handle.net/2152/27158.

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This dissertation describes a proof-of-principle experiment demonstrating a technique for stable isotope enrichment called Magnetically Activated and Guided Isotope Separation (MAGIS) (1). Over the past century a large number of enriched isotopes have become available, thanks largely to electromagnetic separators called calutrons that were developed during World War II. These isotopes have found applications across an array of fields including medicine, basic science, and energy. Due to substantial maintenance and operating costs, the United States decommissioned the last of its calutrons in 1
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45

Ervin, Benjamin Lee. "Monitoring corrosion of rebar embedded in mortar using guided ultrasonic waves /." 2007. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3290229.

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Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2007.<br>Source: Dissertation Abstracts International, Volume: 68-11, Section: B, page: 7382. Adviser: Henrique Reis. Includes bibliographical references (leaves 314-326) Available on microfilm from Pro Quest Information and Learning.
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46

Ahumada, Daniel F. "Évaluation de la corrélation inter-substitut pour le suivi de tumeurs pulmonaires indirect." Thesis, 2019. http://hdl.handle.net/1866/24364.

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Le but principal de ce projet est de préparer l’implantation clinique du système Clarity qui utilise une sonde ultrasonore pour visualiser l’anatomie interne du patient. Ce système est utilisé pour les cas de prostate et nécessite d’être adapté pour les cas de poumon. L’utilité de ce système est de suivre un substitut afin d’inférer la position d’une tumeur pulmonaire. L’hypothèse de cette étude est qu’un substitut interne serait mieux corrélé avec une tumeur pulmonaire que le seraient des marqueurs externes. Les sous-objectifs sont : 1) aborder l’adaptation du montage pour faire des acquisiti
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Pönisch, Wolfram. "Dynamics of bacterial aggregates: Theory guided by experiments." Doctoral thesis, 2017. https://tud.qucosa.de/id/qucosa%3A30950.

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The majority of bacteria are organized in surface-associated communities, the so called biofilms. Crucial processes that drive the formation of such biofilms are the motility of bacteria on a substrate, enabling cells to reach each others vicinity, and attractive cell-cell-interactions, driving the formation of microcolonies. These colonies, aggregates consisting of thousands of cells, are the precursors of biofilms. In this thesis we investigate the role of cell appendages, called type IV pili, in the substrate motion of bacteria and the formation of bacterial microcolonies. Therefore, we stu
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48

Johnston, Holly A. "Benchmarking a new three-dimensional ultrasound system for prostate image guided radiation therapy." Thesis, 2008. http://hdl.handle.net/1828/889.

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Image guided radiation therapy (IGRT) is a new type of radiotherapy used to deliver lethal doses of radiation to mobile tumors, while preventing surrounding healthy structures from receiving high doses of radiation. It relies on image guidance to track the tumor and ensure its prescribed position in the radiation beam. The main goal of this work was to determine if a new three-dimensional ultrasound (3D US) image guidance device, called the Restitu System, could safely replace (or be used interchangeably with) an existing method involving x-ray images of implanted fiducial markers (FMs) for
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