Дисертації з теми "X-RAY DEVICE"
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Hill, Joanne E. "The charge coupled device as an X-Ray polarimeter." Thesis, University of Leicester, 1999. http://hdl.handle.net/2381/30620.
Повний текст джерелаBray, Terry Lee. "A novel device for growing protein crystals : computer control and automation." Thesis, Georgia Institute of Technology, 1990. http://hdl.handle.net/1853/30428.
Повний текст джерелаCarter, David John Donat 1966. "Sub-50nm x-ray lithography with application to a coupled quantum dot device." Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/50037.
Повний текст джерелаIncludes bibliographical references (p. 214-231).
by David John Donat Carter.
Ph.D.
Poust, Benjamin David. "X-ray scatter based metrologies for the development of metamorphic semiconductor device structures." Diss., Restricted to subscribing institutions, 2007. http://proquest.umi.com/pqdweb?did=1320974691&sid=1&Fmt=2&clientId=1564&RQT=309&VName=PQD.
Повний текст джерелаMahadik, Nadeemullah A. "Non-destructive x-ray characterization of wide-bandgap semiconductor materials and device structures." Fairfax, VA : George Mason University, 2008. http://hdl.handle.net/1920/3404.
Повний текст джерелаVita: p. 104. Thesis director: Mulpuri V. Rao. Submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy in Electrical and Computer Engineering. Title from PDF t.p. (viewed Mar. 17, 2009). Includes bibliographical references (p. 99-103). Also issued in print.
Swaminathan, S. "Characterisation of III-V quaternary multilayer semiconductor device materials by X-ray diffraction." Thesis, University of Warwick, 1985. http://wrap.warwick.ac.uk/110577/.
Повний текст джерелаOzkan, Cigdem. "The Controlled Drift Detector As An X-ray Imaging Device For Diffraction Enhanced Imaging." Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/2/12610414/index.pdf.
Повний текст джерелаPym, Alexander Thomas Gafswood. "Grazing incidence X-Ray scattering from the interfaces of thin film magnetic device materials." Thesis, Durham University, 2008. http://etheses.dur.ac.uk/2317/.
Повний текст джерелаKang, Jun. "Thin film CdTe as high energy x-ray detector material for medical applications." Connect to full text in OhioLINK ETD Center, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1228060515.
Повний текст джерелаGow, Jason Peter David. "Radiation damage analysis of the swept charge device for the C1XS instrument." Thesis, Brunel University, 2010. http://bura.brunel.ac.uk/handle/2438/4311.
Повний текст джерелаKim, Man-ho. "Three-dimensional numerical analysis of astronomical charge-coupled device image sensors for X-ray or UV detection." Thesis, University of Leicester, 1995. http://hdl.handle.net/2381/34791.
Повний текст джерелаWard, Allan III. "Residual Stress Effects on Power Slump and Wafer Breakage in GaAs MESFETs." Diss., Virginia Tech, 1996. http://hdl.handle.net/10919/30503.
Повний текст джерелаPh. D.
Sharpnack, Lewis Lee. "Mesomorphism of Newly Synthesized Mesogens and Surface Morphology of Chalcogenide Glass Thin Films." Kent State University / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=kent1499949477885501.
Повний текст джерелаMohamed, Amgad Elsayed Soliman. "A dense plasma focus device as a pulsed neutron source for material identification." Diss., Kansas State University, 2015. http://hdl.handle.net/2097/18997.
Повний текст джерелаDepartment of Mechanical and Nuclear Engineering
William L. Dunn
Dense plasma focus (DPF) devices are pulsed power devices capable of producing short-lived, hot and dense plasmas (~10[superscript]19 cm[superscript]-3) through a fast compression of plasma sheath. A DPF device provides intense bursts of electrons and ion beams, X-rays, and 2.5 MeV neutrons when operated with deuterium through the fusion reaction [superscript]2H(d,n)[superscript]3He. The Kansas State University DPF machine was designed and constructed in early 2010. The device was characterized to determine its performance as a neutron source. The device was shown to produce 5.0x10[superscript]7 neutrons/pulse using a tungsten-copper anode. Such machines have the advantages of being non-radioactive, movable, and producing short pulses (typically tens of nanoseconds), which allows rapid interrogation. The signature-based radiation-scanning (SBRS) method has been used to distinguish targets that contain explosives or explosive surrogates from targets that contain materials called “inert,” meaning they are not explosive-like. Different targets were placed in front of the DPF source at a distance of 45 cm. Four BC-418 plastic scintillators were used to measure the direct neutron yield and the neutrons scattered from various targets; the neutron source and the detectors were shielded with layers of lead, stainless steel, and borated polyethylene to shield against the X-rays and neutrons. One of the plastic scintillators was set at 70[supercript]o and two were set at 110[superscript]o from the line of the neutron beam; a bare [superscript]3He tube was used for detecting scattered thermal neutrons. Twelve metal cans of one-gallon each containing four explosive surrogates and eight inert materials were used as targets. Nine materials in five-gallon cans including three explosive surrogates were also used. The SBRS method indicated a capability to distinguish the explosive surrogates in both experiments, although the five gallon targets gave more accurate results. The MCNP code was used to validate the experimental work and to simulate real explosives. The simulations indicated the possibility to use the time of flight (TOF) technique in future experimental work, and were able to distinguish all the real explosives from the inert materials.
Davesne, Vincent. "Organic spintronics : an investigation on spin-crossover complexes from isolated molecules to the device." Phd thesis, Université de Strasbourg, 2013. http://tel.archives-ouvertes.fr/tel-01062266.
Повний текст джерелаSpisni, Giacomo. "Radiation-sensitive OXide semiconductor Field Effect Transistor (ROXFET): a novel thin-film device for real-time and remote ionizing radiation detection." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021. http://amslaurea.unibo.it/24394/.
Повний текст джерелаParent, Laure. "The use of Monte Carlo methods to study the effect of X-Ray spectral variations on the response of an Amorphous Silicon Electronic Portal Imaging Device." Thesis, Institute of Cancer Research (University Of London), 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.444169.
Повний текст джерелаHaralson, Erik. "Device design and process integration for SiGeC and Si/SOI bipolar transistors." Doctoral thesis, KTH, Microelectronics and Information Technology, IMIT, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3836.
Повний текст джерелаSiGe is a significant enabling technology for therealization of integrated circuits used in high performanceoptical networks and radio frequency applications. In order tocontinue to fulfill the demands for these applications, newmaterials and device structures are needed. This thesis focuseson new materials and their integration into heterojunctionbipolar transistor (HBT) structures as well as using devicesimulations to optimize and better understand the deviceoperation. Specifically, a SiGeC HBT platform was designed,fabricated, and electrically characterized. The platformfeatures a non-selectively grown epitaxial SiGeC base,in situdoped polysilicon emitter, nickel silicide,LOCOS isolation, and a minimum emitter width of 0.4 μm.Alternately, a selective epitaxy growth in an oxide window wasused to form the collector and isolation regions. Thetransistors exhibited cutoff frequency (fT) and maximum frequency of oscillation (fMAX) of 40-80 GHz and 15-45 GHz, respectively.Lateral design rules allowed the investigation of behavior suchas transient enhanced diffusion, leakage current, and theinfluence of parasitics such as base resistance and CBC. The formation of nickel silicide on polysiliconSiGe and SiGeC films was also investigated. The formation ofthe low resistivity monosilicide phase was shown to occur athigher temperatures on SiGeC than on SiGe. The stability of themonosilicide was also shown to improve for SiGeC. Nickelsilicide was then integrated into a SiGeC HBT featuring aselectively grown collector. A novel, fully silicided extrinsicbase contact was demonstrated along with the simultaneousformation of NiSi on thein situdoped polysilicon emitter.
High-resolution x-ray diffraction (HRXRD) was used toinvestigate the growth and stability of SiGeC base layers forHBT integration. HRXRD proved to be an effective, fast,non-destructive tool for monitoring carbon out-diffusion due tothe dopant activation anneal for different temperatures as wellas for inline process monitoring of epitaxial growth of SiGeClayers. The stability of the SiGe layer with 0.2-0.4 at% carbonwhen subjected to dopant activation anneals ranging from1020-1100°C was analyzed by reciprocal lattice mapping.It was found that as the substitutional carbon increases theformation of boron clusters due to diffusion is suppressed, buta higher density of carbon clusters is formed.
Device simulations were performed to optimize the DC and HFperformance of an advanced SiGeC HBT structure with low baseresistance and small dimension emitter widths. The selectivelyimplanted collector (SIC) was studied using a design ofexperiments (DOE) method. For small dimensions the lateralimplantation straggle has a significant influence on the SICprofile (width). A significant influence of the SIC width onthe DC gain was observed. The optimized structure showedbalanced fT/fMAXvalues of 200+ GHz. Finally, SOI BJT transistorswith deep trench isolation were fabricated in a 0.25μmBiCMOS process and self-heating effects were characterized andcompared to transistors on bulk silicon featuring deep trenchand shallow trench isolation. Device simulations based on SEMcross-sections and SIMS data were performed and the resultscompared to the fabricated transistors.
Key words:Silicon-Germanium(SiGe), SiGeC,heterojunction bipolar transistor(HBT), nickel silicide,selectively implanted collector(SIC), device simulation, SiGeClayer stability, high resolution x-ray diffraction(HRXRD),silicon-on-insulator(SOI), self-heating.
Montag, Benjamin W. "Lithiated ternary compounds for neutron detectors: material production and device characterization of lithium zinc phosphide and lithium zinc arsenide." Diss., Kansas State University, 2015. http://hdl.handle.net/2097/20415.
Повний текст джерелаMechanical and Nuclear Engineering
Douglas S. McGregor
There is a need for compact, rugged neutron detectors for a variety of applications including national security and oil well logging. A solid form neutron detector would have a higher efficiency than present day gas filled ³He and ¹⁰BF ₃ detectors, which are standards currently used in the industry today. A sub-branch of the III-V semiconductors is the filled tetrahedral compounds, known as Nowotny-Juza compounds (A[superscript I]B[superscript II]C[superscript V]). These materials are desirable for their cubic crystal structure and semiconducting electrical properties. Originally studied for photonic applications, Nowotny-Juza compounds have not been fully developed and characterized. Nowotny-Juza compounds are being studied as neutron detection materials here, and the following work is a study of LiZnP and LiZnAs material development and device characterization. Precursor binaries and ternary materials of LiZnAs and LiZnP were synthesized in-house in vacuum sealed quartz ampoules with a crucible lining. Synthesized powders were characterized by x-ray diffraction, where lattice constants of 5.751 ± .001 Å and 5.939 ± .002 Å for LiZnP and LiZnAs, respectively, were determined. A static vacuum sublimation in quartz was performed to help purify the synthesized ternary material. The resulting material from the sublimation process showed characteristics of a higher purity ternary compound. Bulk crystalline samples were grown from the purified material. Ingots up to 9.0 mm in diameter and 13.0 mm in length were harvested. Individual samples were characterized for crystallinity on a Bruker AXS Inc. D2 CRYSO, energy dispersive x-ray diffractometer, and a Bruker AXS D8 DISCOVER, high-resolution x-ray diffractometer with a 0.004° beam divergence. High-resolution XRD measurements indicated reasonable out-of-plane and in-plane ordering of LiZnP and LiZnAs crystals. Devices were fabricated from the LiZnP and LiZnAs crystals. Resistivity of devices were determined within the range of 10⁶ – 10¹¹ Ω cm. Charge carrier mobility and mean free drift time products were characterized for electrons at 8.0 x 10⁻⁴ cm² V⁻¹ ± 4.8% and 9.1 x 10⁻⁴ cm² V⁻¹ ± 4.4% for LiZnP and LiZnAs respectively. Sensitivity to 337 nm laser light (3.68 eV photons) was observed, where an absorption coefficient of 0.147 mm⁻¹ was determined for LiZnAs devices. Thermal neutron sensitivity was evaluated with unpurified and purified LiZnP and LiZnAs devices. Sensitivity was observed, however material quality and crystalline quality significantly hindered device performance.
Eklund, Anders. "Microwave Frequency Stability and Spin Wave Mode Structure in Nano-Contact Spin Torque Oscillators." Doctoral thesis, KTH, Integrerade komponenter och kretsar, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-188546.
Повний текст джерелаDagens snabba utveckling inom informationsteknik drivs på av ständigt växande informationsmängder och deras samhällsanvändning inom allt från resursoptimering till underhållning. Utvecklingen möjliggörs till stor del hårdvarumässigt av miniatyrisering och integrering av elektroniska komponenter samt trådlös kommunikation med allt större bandbredd och högre överföringshastighet. Det senare uppnås främst genom utnyttjande av högre radiofrekvenser i teknologiskt tidigare oåtkomliga delar av spektrumet. Frekvensutnyttjandet har det senaste årtiondet ökat markant i mikrovågsområdet med typiska frekvenser runt 2.4 GHz och 5.2-5.8 GHz. I den spinntroniska oscillatorn (STO:n) möjliggörs frekvensgenerering i det breda området från 0.1 GHz upp till över 65 GHz av en komponent med mikrometerstorlek som kan integreras direkt i CMOS-mikrochip. Till skillnad från i konventionella radiokretsar med oscillatorer konstruerade av integrerade transistorer och spolar, genereras mikrovågsfrekvensen direkt i STO:ns magnetiska material och omvandlas därefter till en elektrisk signal genom komponentens magnetoresistans. Dessa materialegenskaper möjliggör ett tillgängligt frekvensband med extrem bredd i en och samma STO, som därtill kan frekvensmoduleras direkt genom sin styrström och på så sätt förenklar konstruktionen av sändarsystem. STO:ns icke-linjära egenskaper kan potentiellt också användas för att i en och samma komponent blanda ned mottagna mikrovågssignaler och på så sätt förenkla konstruktionen även av mikrovågsmottagare. STO:ns signalegenskaper bestäms av det magnetiska materialets fysik i form av magnetiseringsdynamik driven av elektriskt genererade spinnströmmar. I denna avhandling studeras denna dynamik experimentellt med särskilt fokus på frekvensstabiliteten i den hittills mest stabila STO-typen; nanokontakts-STO:n. Genom mätningar i tidsdomän av STO:ns elektriska signaler runt 25 GHz har frekvensstabiliteten funnits hänga samman med den typ av icke-linjärt beteende som också funnits vara utmärkande för tillverkningsvariationen i komponenterna. Mikroskopiska undersökningar av materialet visar att en trolig källa till denna variation är den magnetiska metallens uppbyggnad i form av korn i storleksordningen 30 nm, och datorsimuleringar av en sådan materialstruktur har visats kunna reproducera de experimentella resultaten. Därtill har en metod utvecklats för att med röntgenstrålning direkt mäta de små, magnetiska mikrovågsrörelserna i materialet. Denna röntgenteknik möjliggör detaljerade experimentella studier av magnetiseringsdynamiken och kan användas för att verifiera och vidareutveckla den existerande teorin för mikrovågsspinntronik. Sammantaget förs STO-teknologin genom denna studie ett steg närmare sina tänkbara samhällsbreda tillämpningar inom snabb, trådlös kommunikation för massproducerade produkter med integrerad sensor- och datorfunktionalitet.
QC 20160620
Kripalani, Rishi A. "Novel Integration of Conductive-ink Circuitry with a Paper-based Microfluidic Battery as an All-printed Sensing Platform." DigitalCommons@CalPoly, 2016. https://digitalcommons.calpoly.edu/theses/1694.
Повний текст джерелаRodriÌguez, MartiÌn David. "X-ray characterization of smectic devices." Thesis, University of Bristol, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.412347.
Повний текст джерелаHowell, Mark John. "Signal processing for X ray spectroscopy." Thesis, Bangor University, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.361173.
Повний текст джерелаTörne, Karin. "Biocompatible X-ray opaque polymers for medical devices." Thesis, KTH, Skolan för informations- och kommunikationsteknik (ICT), 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-44036.
Повний текст джерелаRodríguez, Sanmartín Daniel. "Smart piezoelectric devices for X-ray optics applications." Thesis, University of Birmingham, 2011. http://etheses.bham.ac.uk//id/eprint/3193/.
Повний текст джерелаWong, Vincent V. "Fabrication of distributed feeback devices using X-ray lithography." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/37789.
Повний текст джерелаIncludes bibliographical references (leaves 125-134).
by Vincent V. Wong.
Ph.D.
Jenkins, Sam. "X-ray characterisation of surface stabilised ferroelectric liquid crystal devices." Thesis, University of Bristol, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.324295.
Повний текст джерелаLawrence, Shane Michael. "X-ray and neutron scattering of multiferroic LuFe2O4." Thesis, Curtin University, 2011. http://hdl.handle.net/20.500.11937/1336.
Повний текст джерелаMariotti, Francesco. "Characterization of organic thin film devices for direct X-ray photoconversion." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amslaurea.unibo.it/17048/.
Повний текст джерелаTanaka, Takashi. "Study on Insertion Devices as Vacuum-Ultraviolet and Soft X-ray Sources." Kyoto University, 1996. http://hdl.handle.net/2433/160810.
Повний текст джерелаKyoto University (京都大学)
0048
新制・課程博士
博士(工学)
甲第6559号
工博第1561号
新制||工||1048(附属図書館)
UT51-96-W403
京都大学大学院工学研究科原子核工学専攻
(主査)教授 今西 信嗣, 教授 若谷 誠宏, 教授 吉川 潔
学位規則第4条第1項該当
Favretto, Stefano. "Applications of x-ray computed microtomography to material science: devices and prespectives." Doctoral thesis, Università degli studi di Trieste, 2008. http://hdl.handle.net/10077/2756.
Повний текст джерелаThe three-dimensional visualization of the inner microstructural features of objects and materials is an aspect of relevant interest for a wide range of scientific and industrial applications. X-ray computed microtomography (μ-CT) is a powerful non-destructive technique capable to satisfy these needs. Once the complete reconstruction of the sample is available, a quantitative characterisation of the microstructure is essential. Through digital image processing tools, image analysis software or custom developed algorithms, it is possible to obtain an exhaustive geometrical, morphological and topological description of the features inside the volume, or to extract other particular parameters of interest (e.g. porosity, voids distribution, cell size distribution, average struts length, connectivity between the cells, tortuosity). This thesis was carried out at the third-generation Elettra Synchrotron Radiation Facility (Trieste, Italy), where a hard X-ray imaging beamline is available. The experience developed at this beamline has leaded scientists to design a complementary state-of-the-art μ-CT facility based on a micro-focus X-ray source, working both in absorption and phase contrast mode. In this dissertation a detailed description of this facility is given together with a rigorous characterization of the imaging system capabilities, in terms of the actual achievable spatial resolution, in order to optimize the working parameters for the different experiments. The main artefacts that concur to the degradation of the quality of the reconstructed images have been considered (e.g. beam hardening effects, ring artefacts, uncertainness associated with the cone-beam geometry): procedures are presented in order to eliminate, or at least to reduce, the causes of these artefacts. The aspects related to the digital image processing of the reconstructed data are intensively developed in this study: appropriated methodologies have been elaborated capable to deal with the different three-dimensional data of complex porous media, providing a correlation between the microstructure and the macroscopic behaviour of the observed materials. Three representative examples obtained with the described methods are used to demonstrate the application of μ-CT, combined with the developed image processing tools, to material science: the geometrical and morphological characterisation of polyurethane foams employed in the automotive industry due their vibro-acoustic properties; a new approach to characterize the resonance spruce wood microstructure in order to study its acoustical behaviour; finally, the possibility of revealing defects in hybrid-friction stir welded aluminium joints, guiding the optimization of the process parameters.
La visualizzazione tridimensionale della struttura interna di oggetti e materiali costituisce un aspetto di notevole interesse per una ampia gamma di applicazioni scientifiche ed industriali. La microtomografia computerizzata a raggi X (μ-CT) rappresenta una potente tecnica di indagine adeguata a soddisfare tali richieste. Una volta completata la ricostruzione del campione in esame, è essenziale poter fornire una caratterizzazione quantitativa della microstruttura evidenziata. Attraverso gli strumenti messi a disposizione dalle moderne tecniche di analisi di immagine, per mezzo di software dedicati o algoritmi personalizzati, è possibile ottenere una descrizione esaustiva della geometria, morfologia e topologia degli elementi microstrutturali presenti, che consenta l’estrazione dei parametri di interesse per la particolare applicazione (porosità, distribuzione dei vuoti, dimensione degli elementi, lunghezze caratteristiche, grado di interconnessione, tortuosità etc.). Il presente lavoro di tesi è stato svolto presso il laboratorio di luce sincrotrone di terza generazione Elettra (Trieste, Italia), dove è disponibile una linea sperimentale dedicata all’imaging con raggi X duri. L’esperienza acquisita da parte dei ricercatori di questa linea ha consentito poi la progettazione di una stazione per μ-CT complementare, allo stato dell’arte e basata su una sorgente di radiazione a microfuoco, capace di operare con modalità di raccolta delle immagini sia in assorbimento sia in contrasto di fase. In questa tesi viene fornita una dettagliata descrizione della stazione, accompagnata da una rigorosa caratterizzazione del sistema impiegato per l’acquisizione e la ricostruzione delle immagini, in termini di risoluzione spaziale raggiungibile, così da consentire l’ottimizzazione dei parametri critici di lavoro nelle differenti condizioni sperimentali. Vengono poi presi in considerazione i principali artefatti che contribuiscono al deterioramento della qualità delle immagini ottenute (come il beam hardening, gli artefatti ad anello, gli artefatti legati all’incertezza geometrica associata al fascio conico etc.): vengono quindi proposti dei metodi per l’eliminazione, o almeno la riduzione, delle cause che li determinano. Nella tesi inoltre sono sviluppati in maniera approfondita gli aspetti connessi al trattamento dei dati digitali raccolti: sono state infatti elaborate delle metodologie appropriate, capaci di trattare i diversi tipi di dato provenienti dall’analisi di mezzi porosi, determinanti per la comprensione della correlazione tra la microstruttura del materiale ed il suo comportamento macroscopico. Infine, vengono proposti tre esempi rappresentativi per dimostrare l’efficacia dell’applicazione della μ-CT, in combinazione con gli strumenti di analisi di immagine messi a punto, alla scienza dei materiali: la caratterizzazione geometrica e morfologica di schiume di poliuretano impiegate nell’industria automobilistica come isolante vibro-acustico; un nuovo approccio rivolto alla caratterizzazione della struttura del legno di risonanza al fine di studiarne il comportamento acustico; la possibilità di mettere in luce i difetti in giunti di saldatura di leghe d’alluminio realizzati con la tecnica ibrida friction stir welding/TIG in maniera da ottimizzare i parametri di processo.
XX Ciclo
1978
Horsburgh, Gordon. "MBE growth and characterisation of II-VI semiconductor materials and devices." Thesis, Heriot-Watt University, 1997. http://hdl.handle.net/10399/1256.
Повний текст джерелаBismuth, Vincent, and Vincent Bismuth. "Image processing algorithms for the visualization of interventional devices in X-ray fluoroscopy." Phd thesis, Université Paris-Est, 2012. http://tel.archives-ouvertes.fr/tel-00786326.
Повний текст джерелаLim, Michael H. (Michael Hong). "Development of X-ray lithography and nanofabrication techniques for III-V optical devices." Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/16801.
Повний текст джерелаIncludes bibliographical references (p. [117]-122).
This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
This dissertation covers the development of fabrication techniques for Bragg-grating-based integrated optical devices in III-V materials. Work on this rich family of devices has largely been limited to numerical analysis because of the difficulties of their fabrication. The challenges of fabrication are addressed by dividing the problem along two lines: (1) development of an advanced x-ray mask system that addresses future nanolithography needs, and (2) development of fabrication techniques that addresses problems specific to Bragg-grating-based filters. A new x-ray mask configuration is described that improves many aspects of the x-ray mask. A novel means of measuring nondestructively x-ray mask distortion on a global scale was developed, called holographic phase-shifting interferometry (HPSI). This system, in conjunction with appropriate thermal input can potentially provide active correction of x-ray mask distortion. Current microphotonic fabrication issues are presented along with a detailed description of the dual-layer hardmask process (DLHP). The development of the DLHP was specifically geared towards the special requirements of Bragg-grating based microphotonics. Taken as a whole the author hopes that this dissertation serves to facilitate the building of advanced future integrated-optical devices.
by Michael Lim.
Sc.D.
Chembrolu, Venkatesh. "Time-resolved X-ray imaging of magnetization dynamics in spin transfer torque devices /." May be available electronically:, 2008. http://proquest.umi.com/login?COPT=REJTPTU1MTUmSU5UPTAmVkVSPTI=&clientId=12498.
Повний текст джерелаBismuth, Vincent. "Image processing algorithms for the visualization of interventional devices in X-ray fluoroscopy." Thesis, Paris Est, 2012. http://www.theses.fr/2012PEST1062/document.
Повний текст джерелаStent implantation is the most common treatment of coronary heart disease, one of the major causes of death worldwide. During a stenting procedure, the clinician inserts interventional devices inside the patient's vasculature. The navigation of the devices inside the patient's anatomy is monitored in real-time, under X-ray fluoroscopy. Three specific interventional devices play a key role in this procedure: the guide-wire, the angioplasty balloon and the stent. The guide-wire appears in the images as a thin curvilinear structure. The angioplasty balloon, that has two characteristic markerballs at its extremities, is mounted on the guide-wire. The stent is a 3D metallic mesh, whose appearance is complex in the fluoroscopic images. Stents are barely visible, but the proper assessment of their deployment is key to the procedure. The objective of the work presented in this thesis is twofold. On the first hand, we aim at designing, studying and validating image processing techniques that improve the visualization of stents. On the second hand, we study the processing of curvilinear structures (like guide-wires) for which we propose a new image processing technique. We present algorithms dedicated to the 2D and 3D visualization of stents. Since the stent is hardly visible, we do not intend to directly locate it by image processing means in the images. The position and motion of the stent are inferred from the location of two landmarks: the angioplasty balloon and of the guide-wire, which have characteristic shapes. To this aim, we perform automated detection, tracking and registration of these landmarks. The cornerstone of our 2D stent visualization enhancement technique is the use of the landmarks to perform motion compensated noise reduction. We evaluated the performance of this technique for 2D stent visualization over a large database of clinical data (nearly 200 cases). The results demonstrate that our method outperforms previous state of the art techniques in terms of image quality. A comprehensive validation confirmed that we reached the level of performance required for the commercial introduction of our algorithm. It is currently deployed in a large number of clinical sites worldwide. The 3D stent visualization that we propose, uses the landmarks to achieve motion compensated tomographic reconstruction. We show preliminary results over 22 clinical cases. Our method seems to outperform previous state of the art techniques both in terms of automation and image quality. The previous stent visualization methods involve the segmentation of the part of the guide-wire extending through the stent. We propose a generic tool to process such curvilinear structures that we call the Polygonal Path Image (PPI). The PPI relies on the concept of locally optimal paths. One of its main advantages is that it unifies the concepts of several previous state of the art techniques in a single formalism. Moreover the PPI enables to control the smoothness and the length of the structures to segment. Its parametrization is simple and intuitive. In order to fully benefit from the PPI, we propose an efficient scheme to compute it. We demonstrate its applicability for the task of automated guide-wire segmentation, for which it outperforms previous state of the art techniques
Mclean, Ivan Hugh. "An adaptive discrete cosine transform coding scheme for digital x-ray images." Thesis, Rhodes University, 1989. http://hdl.handle.net/10962/d1002032.
Повний текст джерелаBuchanan, James David Ralph. "The chemical and magnetic structural characterisation of magneto-resistive devices using X-ray techniques." Thesis, Durham University, 2003. http://etheses.dur.ac.uk/4046/.
Повний текст джерелаLeal, Michael J. "Effect of pixel size and scintillator on image quality of a CCD-based digital x-ray imaging system." Link to electronic thesis, 2001. http://www.wpi.edu/Pubs/ETD/Available/etd-0502101-123456.
Повний текст джерелаFarmand, Maryam. "X-ray Absorption Spectroscopy Characterization of Electrochemical Processes in Renewable Energy Storage and Conversion Devices." Thesis, The George Washington University, 2013. http://pqdtopen.proquest.com/#viewpdf?dispub=3557518.
Повний текст джерелаThe development of better energy conversion and storage devices, such as fuel cells and batteries, is crucial for reduction of our global carbon footprint and improving the quality of the air we breathe. However, both of these technologies face important challenges. The development of lower cost and better electrode materials, which are more durable and allow more control over the electrochemical reactions occurring at the electrode/electrolyte interface, is perhaps most important for meeting these challenges. Hence, full characterization of the electrochemical processes that occur at the electrodes is vital for intelligent design of more energy efficient electrodes.
X-ray absorption spectroscopy (XAS) is a short-range order, element specific technique that can be utilized to probe the processes occurring at operating electrode surfaces, as well for studying the amorphous materials and nano-particles making up the electrodes. It has been increasingly used in recent years to study fuel cell catalysts through application of the Δ&mgr; XANES technique, in combination with the more traditional X-ray Absorption Near Edge Structure (XANES) and Extended X-ray Absorption Fine Structure (EXAFS) techniques. The Δ&mgr; XANES data analysis technique, previously developed and applied to heterogeneous catalysts and fuel cell electrocatalysts by the GWU group, was extended in this work to provide for the first time space resolved adsorbate coverages on both electrodes of a direct methanol fuel cell. Even more importantly, the Δ&mgr; technique was applied for the first time to battery relevant materials, where bulk properties such as the oxidation state and local geometry of a cathode are followed.
Magnan, François. "Sulphur- & Nitrogen-Containing π-Conjugated Organic Molecules as Potential Semiconductors for Optoelectronic Devices". Thesis, Université d'Ottawa / University of Ottawa, 2017. http://hdl.handle.net/10393/36754.
Повний текст джерелаKevin, Punarja. "On the synthesis, measurement and applications of solar energy materials and devices." Thesis, University of Manchester, 2016. https://www.research.manchester.ac.uk/portal/en/theses/on-the-synthesis-measurement-and-applications-of-solar-energy-materials-and-devices(9273d60d-cc5a-4992-8fae-ac9ddefa506b).html.
Повний текст джерелаSmith, Stephen James. "Development of transition edge sensor distributed read-out imaging devices for applications in X-ray astronomy." Thesis, University of Leicester, 2006. http://hdl.handle.net/2381/30586.
Повний текст джерелаXiao, Ting [Verfasser], and Marcus [Gutachter] Bär. "X-ray spectroscopic study of heterostructure contacting schemes for optoelectronic devices / Ting Xiao ; Gutachter: Marcus Bär." Cottbus : BTU Cottbus - Senftenberg, 2019. http://d-nb.info/1197614079/34.
Повний текст джерелаTudge, Mark Vernon. "Long and short term effects of X-rays on charge coupled devices." Thesis, Brunel University, 1996. http://bura.brunel.ac.uk/handle/2438/10450.
Повний текст джерелаMurray, Bryon Michael. "Determination of eye dose from personnel monitoring devices in medical institutions." Thesis, Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/17040.
Повний текст джерелаBoudlali, Hana. "Analysis of Electroanatomic Mapping System Accuracy Using X-Ray Reconstruction of Electrode Locations in a Porcine Animal Model." DigitalCommons@CalPoly, 2020. https://digitalcommons.calpoly.edu/theses/2237.
Повний текст джерелаPaganestis, Antonios. "Investigation of the performance of microstrip gas detectors for X-rays and evaluation of their application to mammography." Thesis, University College London (University of London), 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.266593.
Повний текст джерелаAlbertini, Caio Marcos de Moraes. "Estudo prospectivo de eventos tromboembólicos após reoperações de alta complexidade em estimulação cardíaca artificial definitiva." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/5/5156/tde-26032018-125007/.
Повний текст джерелаINTRODUCTION: Venous stenosis or occlusion is a frequent finding in patients with previously-implanted transvenous leads. Clinical manifestations of these venous lesions, however, are rarely reported. Although there is a consensus that thromboembolic events are more frequent after reoperation involving the implantation of new leads or lead removal, there is still no evidence to support this observation. OBJECTIVES: In patients submitted to reoperations due to lead dysfunction or device upgrade, the study aimed to determine: a) the incidence of pulmonary embolism (PE) and upper extremity deep venous thrombosis (UEDVT) ipsilateral to the cardiac device; b) the prevalence of venous lesions determined by preoperative venography, and the occurrence of modifications or progression of these lesions six months after the procedure; and c) prognostic factors for clinical and venographic outcomes. METHODS: From April/2013 to July/2016, 84 patients were studied. The preoperative evaluation included: upper extremity venous ultrasound, computed tomography pulmonary angiography, digital subtraction venography and specific laboratory tests for coagulation and hemostasis. Diagnostic exams were repeated postoperatively to detect the study outcomes. All patients were followed for 12 months. Primary outcomes were occurrence of PE or UEDVT within 30 days after the procedure. Secondary outcomes were venographic changes six months after the surgical intervention. Student\'s t test, Chi-square or Fisher\'s Exact test were used in the univariate analysis of demographic, clinical, operative and laboratory variables. Multivariate logistic regression models were used to identify prognostic factors. RESULTS: Among the 84 patients included, there was a balance between gender and the mean age was 59.3 ± 15.2 years. Lead malfunctioning (75%) was the main surgical procedure indication. Lead removal was performed in 52.4% of the cases. The rate of postoperative clinical and subclinical events was 35.7%, represented by UEDVT in 24 (28.6%) cases and PE in 6 (7.1%). Alterations in the venography findings six months after the surgery were identified in 34.5% of the patients. Independent prognostic factors for UEDVT were: the presence of significant collateral circulation in the preoperative venography ([odds ratio (OR)= 4.7; [95% confidence interval (CI): 1.1 - 19.8; P=0.037), transvenous lead extraction (OR= 27.4; 95% CI 5.8-128.8; P < 0.0001) and fibrinogen variation (OR= 1.02; 95% CI 1.01 - 1.03; P=0.018). Smoking history was the only prognostic factor related to the occurrence of PE (OR= 14.6; 95% CI 2.3 - 91.8; P=0,004). Transvenous lead extraction was the only independent prognostic factor (OR= 5.0; 95% CI 1.6 - 15.4; P=0.004) for postoperative venographic endpoints. CONCLUSION: Reoperations involving previously transvenous implanted leads present high rates of thromboembolic complications and venographic alterations. Transvenous lead extraction had a significant impact on the development of UEDVT and venographic alterations. These results show the need for further studies to evaluate the role of preventive strategies for this subgroup of patients
Greenlee, Jordan Douglas. "Study of cation-dominated ionic-electronic materials and devices." Diss., Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/53401.
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