Dissertations / Theses: 'Coherence gate'

1

Effenberger, Adam. "Pozorování amplitudových a fázových předmětů přes rozptylující prostředí pomocí holografického mikroskopu s kontrolovatelnou koherencí." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-232190.

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This diploma thesis deals with phase and amplitude objects observation through scattering media by means of a coherence-controlled holographic microscope (CCHM). A brief history of development and construction of the microscope, its advantages compared to the classical light microscopy and hologram processing are described. Quantitative phase imaging through scattering media by means of ballistic as well as diffuse light is verificated in the experimental part. A comparison of an image obtained through a scattering layer by means of CCHM and a classical microscopy in the light field is demonstrated.

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Ďuriš, Miroslav. "Zobrazení objektu v rozptylujícím prostředí kombinací signálu balistických a rozptýlených fotonů v koherencí řízeném holografickém mikroskopu." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2018. http://www.nusl.cz/ntk/nusl-392845.

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Diplomová práca sa zaoberá kvantitatívnym fázovým zobrazovaním objektov umiestnených za rozptyľujúcim prostredím v koherenciou riadenom holografickom mikroskope. Tento mikroskop umožnuje zobrazovať s úplne nekoherentným osvetlením vzorky, čo vyvoláva efekt koherenčnej brány. Koherenčná brána je veľmi dôležitá vlastnosť zobrazovacieho systému umožňujúca separáciu balistických a rozptýlených fotónov, jej dôkladnému vysvetleniu je venovaná značná časť práce. Ďalej sú prezentované základy teórie zobrazenia v koherenciou riadenom holografickom mikroskope. Tie sú využité v závere práce pri interpretácii experimentálnych výsledkov. Cieľom práce je navrhnúť metódu pre pozorovanie fázových objektov v rozptyľujúcich prostrediach a experimentálne túto metódu overiť. Na základe analytických výsledkov a predchádzajúceho výskumu je navrhnutá nová metóda, ktorá je ďalej overovaná pomocou rôzne komplexných vzoriek. Je založená na zázname viacerých obrazov s rôznym posunutím referenčného poľa. Každý posun korešponduje so zobrazovaním pomocou inej skupiny fotónov. Je možné vytvoriť syntetický obraz so zlepšenou kvalitou sčítaním jednotlivých obrazov získaných z interferencie balistických alebo rozptýlených fotónov. Experimenty s rôzne komplexnými vzorkami poskytujú náhľad na obmedzenia prezentovanej metódy.

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3

Slabý, Tomáš. "Koherencí řízený holografický mikroskop nové generace." Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-234255.

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This doctoral thesis deals with design of a new generation of coherence-controlled holographic microscope (CCHM). The microscope is based on off-axis holographic configuration using diffraction grating and allows the use of temporally and spatially incoherent illumination. In the theoretical section a new optical configuration of the microscope is proposed and conditions for different parameters of the microscope and its optical components are derived. The influence of different sources of noise on phase detection sensitivity is studied. In the next section design of experimental setup is described and automatable adjustment procedure is proposed. Last section describes experimental verification of the most important optical parameters of the experimental setup. When compared to previous generation of CCHM, the newly proposed configuration uses infinity-corrected objectives and common microscope condensers, allows more space for the specimens, eliminates the limitation of spectral transmittance and significantly simplifies the adjustment procedure so that automation of this procedure is possible.

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4

Owen, Gabrielle M. "Coherence gated confocal microscopy." Thesis, Massachusetts Institute of Technology, 1993. http://hdl.handle.net/1721.1/12434.

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Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1993.
Includes bibliographical references (leaves 33-34).
by Gabrielle M. Owen.
B.S.

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5

Calderon, Ana C. M. A. "Understanding game semantics through coherence spaces." Thesis, University of Bath, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.580675.

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6

Feierabend, Marcus. "Coherence gated wave-front sensing in strongly scattering samples." [S.l. : s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=972116575.

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7

Dunsby, Christopher William. "Wide-field coherence-gated imaging techniques including photorefractive holography." Thesis, Imperial College London, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.407465.

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8

Gauger, E. M. "Applications of quantum coherence in condensed matter nanostructures." Thesis, University of Oxford, 2010. http://ora.ox.ac.uk/objects/uuid:fb792980-bfc4-4771-b5d5-b9ecc7d40cd8.

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This thesis is concerned with studying the fascinating quantum properties of real-world nanostructures embedded in a noisy condensed matter environment. The interaction with light is used for controlling and manipulating the quantum state of the systems considered here. In some instances, laser pulses also provide a way of actively probing and controlling environmental interactions. The first two research chapters assess two different ways of performing all-optical spin qubit gates in self-assembled quantum dots. The principal conclusion is that an `adiabatic' control technique holds the promise of achieving a high fidelity when all primary sources of decoherence are taken into account. In the next chapter, it is shown that an optically driven quantum dot exciton interacting with the phonons of the surrounding lattice acts as a heat pump. Further, a model is developed which predicts the temperature-dependent damping of Rabi oscillations caused by bulk phonons, finding an excellent agreement with experimental data. A different system is studied in the following chapter: two electron spin qubits with no direct interaction, yet both exchange-coupled to an optically active mediator spin. The results of this study show that these general assumptions are sufficient for generating controlled electron spin entanglement over a wide range of parameters, even in the presence of noise. Finally, the Radical Pair model of the avian compass is investigated in the light of recent experimental results, leading to the surprising prediction that the electron spin coherence time in this molecular system seems to approach the millisecond timescale.

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9

Jenkins, Michael W. "Imaging the Embryonic Heart with Optical Coherence Tomography." Case Western Reserve University School of Graduate Studies / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=case1207340565.

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10

Moser, Steven. "Coherence gated laser ray tracing based on a high speed FPGA platform." Thesis, University of Kent, 2017. https://kar.kent.ac.uk/62046/.

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By combining principles from low-coherence interferometry and wavefront sensing, a depth-resolved wavefront sensor may be realised. This allows only light from within the coherence-gate of the interferometer to be measured by the wavefront sensing device. By adjusting the axial position of the coherence-gate, wavefronts from distinct layers of a multi-layer object may be measured. This method has been demonstrated for the Shack-Hartmann wavefront sensor but requires an external PC for image processing and wavefront reconstruction. This dissertation presents, for the first time, a depth-resolved laser ray tracing wavefront sensor. Results are shown, in the form of Zernike modes, which demonstrate the ability of the instrument to resolve wavefronts from a multi-layer target (two stacked microscope slides and a mirror). Also, an FPGA based embedded system was developed for all command, control, image processing and wavefront reconstruction functions. This highly specialised system is able to perform these operations in real-time, limited only by the frame rate of the available camera. Specfic attention is given to the portion of the system focused on wavefront reconstruction. Zernike modes are commonly used in adaptive optics systems to represent optical wavefronts. However, real-time calculation of Zernike modes is time consuming due to two factors: the large factorial components in the radial polynomials used to define them, and the large inverse matrix calculation needed for the linear t. This dissertation presents an efficient parallel method for calculating Zernike coefficients from phase gradients and its real-time implementation using an FPGA by pre-calculation and storage of subsections of the large inverse matrix. The architecture exploits symmetries within the Zernike modes to achieve a significant reduction in memory requirements and a speed-up of 2.9 when compared to published results utilising a 2D-FFT method for a grid size of 8 x 8. Analysis of the processor element's internal word length requirements show that 24-bit precision in pre-calculated values of the Zernike mode partial derivatives ensures less than 0.5% error per Zernike coefficient and an overall error of less than 1%.

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11

Voskakis, Konstantinos. "Modeling and simulation of a non-coherent frequency shift keying transceiver using a Field Programmable Gate Array (FPGA)." Thesis, Monterey, Calif. : Naval Postgraduate School, 2008. http://edocs.nps.edu/npspubs/scholarly/theses/2008/Sept/08Sep%5FVoskakis.pdf.

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Thesis (M.S. in Electrical Engineering)--Naval Postgraduate School, September 2008.
Thesis Advisor(s): Kragh, Frank ; Ateshian, Peter. "September 2008." Description based on title screen as viewed on November 4, 2008. Includes bibliographical references (p. 97-103). Also available in print.

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12

Svenningsen, Juan P. "Modeling, simulation and implementation of a non-coherent binary-frequency-shift-keying (BFSK) receiver-transmitter into a field programmable gate array (FPGA)." Thesis, Monterey, California. Naval Postgraduate School, 2005. http://hdl.handle.net/10945/2098.

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This thesis presents the use of a field programmable gate array (FPGA) to implement a non-coherent binary-frequency-shift-keyed receiver-transmitter (BFSK-RT) that simulates the modulation of the SINCGARS radio, the RT-1523C. An FPGA successfully, and with very few resources, implemented the desired modulation and demodulation. Topics covered include FPGA history, the hardware and software utilized, a summary of the SINCGARS RT-1523C characteristics, the BFSK-RT on FPGA design procedure and the design results.

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13

Svenningsen, Juan P. "Modeling, simulation and implementation of a non-coherent binary-frequency-shift-keying (BFSK) receiver-transmitter into a field program-mable gate array (FPGA) /." Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2005. http://library.nps.navy.mil/uhtbin/hyperion/05Sep%5FSvenningsen.pdf.

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Thesis (M.S. in Electrical Engineering)--Naval Postgraduate School, September 2005.
Thesis Advisor(s): Herschel Loomis, Frank Kragh. Includes bibliographical references (p. 83-85). Also available online.

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14

Liu, Yu-Shuo, and 劉于碩. "Learning Lexical and Speech Coherence Representation by Using LSTM Forget Gate." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/u4n8b5.

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碩士
國立清華大學
電機工程學系
107
Since autistic children are less able to carry out a fluent story than typical children, measuring verbal fluency becomes an important indicator when diagnosing autistic children. Fluency assessment, however, needs time-consuming manual tagging, or using expert specially designed characteristics as indicators, therefore, this study proposes a coherence representation learned by directly data-driven architecture, using forget gate of long short-term memory model to export coherence representation from text and audio, at the same time, we also use the ADOS coding related to the evaluation of narration to test our proposed representation. Our proposed lexical coherence representation performs high accuracy of 92% on the task of identifying children with autism from typically development from text modality, and performs high accuracy of 83% on the task of identifying disfluent autistic children’s speech from relatively fluent speech. Comparing with the traditional measurement of text and audio, there is a significant improvement. This paper also further introduces incoherency into coherent samples by randomly shuffling the word order and sentence order on text and adding some pulse or repetitive signal on speech. These processes make the coherent children's story content become incoherent. By visualizing the data samples after dimension reduction, we further observe the distribution of these coherent, incoherent, and those artificially incoherent data samples. We found the artificially incoherent typical samples would move closer to incoherent autistic samples which prove that our proposed representation contains the concept of coherency.

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15

Kroyan, Armen. "Impact of lens aberrations and partial coherence on intra-field critical dimensions of dark gate lines." Thesis, 1997. http://hdl.handle.net/1911/17102.

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Across-field variations of lens aberration and partial coherence can have undesirable effects on critical dimension (CD) uniformity and depth of focus (DOF) of printed patterns. The principal objective of this work is to investigate how lens aberrations and partial coherence variations of the light source affect critical dimensions of dark gate lines when using conventional and phase-shifting masks (PSMs) in optical projection systems. The investigations are done using lithography simulation software tools. These advanced simulators allowed to design different optical projection system setups and diverse types of masks. This allowed to obtain diverse data which reflected the sensitivity of printed gate lines' CDs to variations of partial coherence and lens aberrations. The results are analyzed and compared suggesting guidelines to methods of maintaining a tighter control of CD errors in the manufacturing process of integrated circuits using optical lithography.

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16

Muller, Matthew S. "Time-Gated Fourier-Domain Optical Coherence Tomography." Thesis, 2008. http://hdl.handle.net/1974/990.

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Optical coherence tomography (OCT) has been shown to be a versatile three-dimensional imaging tool in diagnostic medicine, combining micrometre-scale resolutions with fast acquisition times. This imaging modality uses the interference between light backscattered from a sample and light that has traversed a known reference path delay to determine the scattering profile over penetration depths of up to several millimetres in tissue. A novel OCT system is presented that uses nonlinear optics to process the backscattered light in the optical domain prior to standard Fourier-domain OCT acquisition and processing. The nonlinear optical effects experienced between short light pulses are strongly intensity-dependent, occurring only significantly when the pulses are temporally and spatially overlapped. These conditions allow for the creation of a user-controlled time gate that restricts the light backscattered from the sample to a narrow (~100 micrometres) depth field of view prior to detection. When strong and weak scattering interfaces exist across the sample depth range, the signal-to-noise ratio of the weaker scattering sites can be limited by the finite detector dynamic range in Fourier-domain OCT systems. By aligning the time gate temporal delay to the backscatter from the weak interfaces of interest, a user can completely remove the strong backscattered light and enhance imaging contrast. The nonlinear effect used in the current time-gated OCT design is sum-frequency generation, which provides an additional advantage of imaging at near infrared (1280 nm) wavelengths, used for long penetration depths in tissue, while detection is performed in the visible (504 nm) with silicon-based camera technology. With the reduced depth field of view, the number of sampling points required per depth scan is also proportionately reduced, permitting faster acquisition rates for the time-gated region of interest. A complete description of the time-gated OCT system design is presented, along with proof-of-concept images demonstrating contrast enhancement and operation in a highly scattering biological medium. Based on its successful initial performance, future development of this system is expected for its eventual use in many OCT imaging applications.
Thesis (Master, Physics, Engineering Physics and Astronomy) -- Queen's University, 2008-01-15 20:05:41.665
This work was funded by the Natural Sciences and Engineering Research Council and the Cancer Imaging Network of Ontario, supported by Cancer Care Ontario

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17

Vourdas, Apostolos. "Coherent spaces, Boolean rings and quantum gates." 2016. http://hdl.handle.net/10454/8775.

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Yes
Coherent spaces spanned by a nite number of coherent states, are introduced. Their coherence properties are studied, using the Dirac contour representation. It is shown that the corresponding projectors resolve the identity, and that they transform into projectors of the same type, under displacement transformations, and also under time evolution. The set of these spaces, with the logical OR and AND operations is a distributive lattice, and with the logical XOR and AND operations is a Boolean ring (Stone's formalism). Applications of this Boolean ring into classical CNOT gates with n-ary variables, and also quantum CNOT gates with coherent states, are discussed.

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18

Tao, Yuankai Kenny. "Development of Coherence-Gated and Resolution-Multiplexed Optical Imaging Systems." Diss., 2010. http://hdl.handle.net/10161/3026.

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Optical interrogation techniques are particularly well-suited for imaging tissue morphology, biological dynamics, and disease pathogenesis by providing noninvasive access to subcellular-resolution diagnostic information. State-of-the-art spectral domain optical coherence tomography (SDOCT) systems provide real-time optical biopsies of in vivo tissue, and have demonstrated clinical potential, particularly for applications in ophthalmology.

Recent advances in microscopy and endoscopy have led to improved resolution and compact optical designs, beyond those of conventional imaging systems. Application of encoded and multiplexed illumination and detection schemes may allow for the development of optical tools that surpass classical imaging limitations. Furthermore, complementary technologies can be combined to create multimodal optical imaging tools with advantages over current-generation systems.

In this dissertation, the development of coherence-gated and resolution-multiplexed technologies, aimed towards applications in human vitreoretinal imaging is described. Technology development in coherence-gated systems included increasing the imaging range of SDOCT by removing the complex conjugate artifact, improving acquisition speed using a scanning spectrometer design and a two-dimensional detector array, and hardware and algorithmic implementations that facilitated imaging of Doppler flow.

Structured illumination microscopy techniques were applied for resolution enhancement, and a spectrally encoded ophthalmic imaging system was developed for en face confocal fundus imaging through a single-mode fiber. These devices were resolution-multiplexed extensions of existing ophthalmic imaging devices, such as scanning laser ophthalmoscopes (SLO), which demonstrated improved resolution and more compact optical designs as compared to their conventional counterparts.

Finally, several multimodal ophthalmic diagnostic tools were developed that combined the advantages of OCT with existing imaging devices. These included a combined SLO-OCT system and a vitreoretinal surgical microscope combined with OCT. These devices allowed for concurrent ophthalmic imaging using complementary modalities for improved visualization and clinical utility.

Dissertation

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19

Wei, Wen Yao, and 魏文耀. "Gate-controlled Coherent Quantum States in a Quantum Dot Chain." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/30068333151222833567.

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20

Feierabend, Marcus [Verfasser]. "Coherence gated wave-front sensing in strongly scattering samples / presented by Marcus Feierabend." 2004. http://d-nb.info/972116575/34.

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21

Rückel, Markus [Verfasser]. "Adaptive wavefront correction in two-photon microscopy using coherence gated wavefront sensing / presented by Rückel, Markus." 2007. http://d-nb.info/982653573/34.

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22

Lin, Yu-Shian, and 林育賢. "Generation of terahertz radiation by coherenct multiple-stage of optical rectification in GaSe crystals." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/33907118148208132742.

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碩士
國立交通大學
光電工程系所
96
In this thesis, we successfully construct a theoretical model to interpret the optical rectification process in nonlinear optics. Generation of terahertz radiation via frequencies mixing in GaSe crystal by use of the ultra-fast pulses laser is theoretically simulated by taking into account of the phase-matching parameter and absorption coefficient of nonlinear optical crystal. The frequency spectra and time-domain waveforms of terahertz radiation deduced from the numerical simulation are verified by the experimental results. Furthermore, this theoretical model can be extended to the application of coherent multi-stage optical rectification technique. We experimentally generated terahertz radiation via multi-stage optical rectification process. By accurately adjusting the time delay between the two terahertz radiation from the two stages, the terahertz radiation can be coherently superposed with higher output power. This technique verifies the great potential of spectral synthesis of terahertz radiation. Moreover, it is observed that the coherence between the two terahertz radiation from the two stages is as high as 0.8~0.95 by the analysis of spectral-interfeometry method. Besides, the nonlinear absorption coefficient cross-section of GaSe crystal at terahertz frequencies is experimentally fitted in the range of (1.3－5.9)×10-17 cm2. Multi-stage optical rectification technique is expected to overcome the interaction length inside the nonlinear crystal, which is usually limited by group velocity mismatching. The high power terahertz radiation can be generated by coherently cascaded optical rectification processes in GaSe crystals. Under the numerical optimization, the single-cycle terahertz radiation can be generated with pulse energy as high as 400.8 nJ by use of the multi-stage optical rectification technique.

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23

Vourdas, Apostolos. "Dressed coherent states in finite quantum systems: A cooperative game theory approach." 2016. http://hdl.handle.net/10454/11001.

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Yes
A quantum system with variables in Z(d) is considered. Coherent density matrices and coherent projectors of rank n are introduced, and their properties (e.g., the resolution of the identity) are discussed. Cooperative game theory and in particular the Shapley methodology, is used to renormalize coherent states, into a particular type of coherent density matrices (dressed coherent states). The Q-function of a Hermitian operator, is then renormalized into a physical analogue of the Shapley values. Both the Q-function and the Shapley values, are used to study the relocation of a Hamiltonian in phase space as the coupling constant varies, and its effect on the ground state of the system. The formalism is also generalized for any total set of states, for which we have no resolution of the identity. The dressing formalism leads to density matrices that resolve the identity, and makes them practically useful.

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24

Barannyk, Oleksandr. "Shear layer instabilities and flow-acoustic coupling in valves: application to power plant components and cardiovascular devices." Thesis, 2014. http://hdl.handle.net/1828/5372.

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In the first part of this dissertation, the phenomenon of self-sustained pressure os-cillations due to the flow past a circular, axisymmetric cavity, associated with inline gate valves, was investigated. In many engineering applications, such as flows through open gate valves, there exists potential for coupling between the vortex shedding from the up-stream edge of the cavity and a diametral mode of the acoustic pressure fluctuations. The effects of the internal pipe geometry immediately upstream and downstream of the shal-low cavity on the characteristics of partially trapped diametral acoustic modes were in-vestigated numerically and experimentally on a scaled model of a gate valve mounted in a pipeline that contained convergence-divergence sections in the vicinity of the valve. The resonant response of the system corresponded to the second acoustic diametral mode of the cavity. Excitation of the dominant acoustic mode was accompanied by pressure oscillations, and, in addition to that, as the angle of the converging-diverging section of the main pipeline in the vicinity of the cavity increased, the trapped behavior of the acoustic diametral modes diminished, and additional antinodes of the acoustic pressure wave were observed in the main pipeline. In addition to that, the effect of shallow chamfers, introduced at the upstream and/or downstream cavity edges, was investigated in the experimental system that con-tained a deep, circular, axisymmetric cavity. Through the measurements of unsteady pressure and associated acoustic mode shapes, which were calculated numerically for several representative cases of the internal cavity geometry, it was possible to identify the configuration that corresponded to the most efficient noise suppression. This arrangement also allowed calculation of the azimuthal orientation of the acoustic modes, which were classified as stationary, partially spinning or spinning. Introduction of shallow chamfers at the upstream and the downstream edges of the cavity resulted in changes of azimuthal orientation and spinning behaviour of the acoustic modes. In addition, introduction of splitter plates in the cavity led to pronounced change in the spatial orientation and the spinning behaviour of the acoustic modes. The short splitter plates changed the behaviour of the dominant acoustic modes from partially spinning to stationary, while the long split-ter plates enforced the stationary behaviour across all resonant acoustic modes. Finally, the evolution of fully turbulent, acoustically coupled shear layers that form across deep, axisymmetric cavities and the effects of geometric modifications of the cavity edges on the separated flow structure were investigated using digital particle image velocimetry (PIV). Instantaneous, time- and phase-averaged patterns of vorticity pro-vided insight into the flow physics during flow tone generation and noise suppression by the geometric modifications. In particular, the first mode of the shear layer oscillations was significantly affected by shallow chamfers located at the upstream and, to a lesser degree, the downstream edges of the cavity. In the second part of the dissertation, the performance of aortic heart valve pros-thesis was assessed in geometries of the aortic root associated with certain types of valve diseases, such as aortic valve stenosis and aortic valve insufficiency. The control case that corresponds to the aortic root of a patient without valve disease was used as a reference. By varying the aortic root geometry, it was possible to investigate corresponding changes in the levels of Reynolds shear stress and establish the possibility of platelet activation and, as a result of that, the formation of blood clots.
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Dissertations / Theses on the topic 'Coherence gate'

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