Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 39 for “"Pulse Propagation"”.
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Reactor Neutron Pulse Propagation Through Multiplying Media
Made available in DSpace on 2014-12-09T19:52:23Z (GMT). No. of bitstreams: 1 6901334.pdf: 5351646 bytes, checksum: d57a1e704394c2072d8185eb87934af4 (MD5) Previous issue date: 1968
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Modeling of nonlinear ultrashort optical pulse propagation
… interface for simulating a host of ultrashort pulse propagation phenomena. With the proliferation of ultrashort laser technologies, the demand for efficient and accurate simulations has grown significantly. Here I introduce a linear-operator-based formalism for nonlinear pulse propagation …
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Pulse Propagation in Fluid-Filled Elastic Curved Tubes
The propagation of fluid transients through elbows in pipes is an important consideration in the safety analysis of nuclear piping systems. In this study, one-dimensional governing equations for the propagation of pressure pulses in an inviscid compressible fluid contained in a thin-walled …
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Pulse Propagation in Curved Beams--Theory and Experiment
Made available in DSpace on 2014-12-12T00:25:52Z (GMT). No. of bitstreams: 1 7317171.pdf: 1839784 bytes, checksum: 20aea717fa24e176b61719404c77c268 (MD5) Previous issue date: 1972
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Nonlinear acoustic pulse propagation in range-dependent underwater environments
… fluid equations designed to model low angle wave propagation using a wave-following computational domain. The standard formulation consists of four separate mathematical quantities that physically represent refraction, nonlinear steepening, radial spreading, and diffraction. The latter two of …
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Measurement of a Neutron Pulse Propagation Velocity in a Homogeneous Mediuim
Made available in DSpace on 2017-07-06T18:48:19Z (GMT). No. of bitstreams: 2 Guyot_Jean_C_MS.pdf: 16806523 bytes, checksum: 311bbfaa131263f4d04a039a5bee8bac (MD5) license.txt: 4813 bytes, checksum: 715c4321821a960fa1a1e91d2ac7ebce (MD5) Previous issue date: 1964
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I. Resonant Two-Photon Reabsorption by Exciton-Polaritons in Cuprous Chloride Films. Ii. Heat Pulse Propagation Across Metal/sapphire Interfaces. Iii. Phonon Focusing in Piezoelectric Crystals
The work described in this thesis involves the study of optical and thermal properties of semiconductors and consists of three separate topics.
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Mathematical and numerical modelling of dispersion-managed solitons, autosolitons and self-similar optical pulses
… of three topics concerned with nonlinear optical pulse propagation in optical fibres. The techniques used are mathematical analysis and numerical modelling. Firstly, dispersion-managed (DM) solitons in fibre lines employing a weak dispersion map are analysed by means of a perturbation approach. In …
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Asymptotic and numerical analysis of time-dependent wave propagation in dispersive dielectric media that exhibit fractional relaxation
This dissertation addresses electromagnetic pulse propagation through anomalously dispersive dielectric media. The Havriliak-Negami (H-N) and Cole-Cole (C-C) models capture the non-exponential nature of such dielectric relaxation phenomena, which is manifest in a variety of dispersive dielectric …
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Characterising nonlinear waveguides by scanning near-field optical microscopy
… waveguide. This provides the visualisation of pulse evolution prior to the final development as the output light. The SNOM-acquired spectra consist of unique features which have not been observed before in previous nonlinear pulse propagation researches. These distinctive characteristics are …
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Slot discharge characteristics of high voltage machines.
… mechanisms are reviewed, together with discharge pulse propagation and rotating machine insulation diagnostic measurement techniques. In particular, movement of stator coils in the slots of large machines under the influence of naturally occurring electromagnetic forces leads to physical abrasion …
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Power scaling and nonlinear conversion in fiber-based sources at novel wavelengths
… length to maximize phase matching and nonlinear pulse generation. However, current commercially available PCFs can feature up to 10% fluctuation in core diameter uniformity. Therefore, the dispersion and nonlinear coefficient of custom-drawn and commercially available photonic crystal fibers …
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Deep and Dynamic Metabolic and Structural Imaging in Living Tissues
… adaptively modulating multimodal nonlinear pulse propagation with a compact fiber shaper. Moreover, the 8-fold increase in pulse energy at 1100nm enables faster imaging of monocyte behaviors in the living multicellular models. These results represent a significant advance for deep and …
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Neuroninių sistemų slopinimo ir desinchronizavimo algoritmai /
… – a procedure, when high-frequency electrical pulses are delivered to specific brain areas through implanted electrodes. Despite long and successful history of DBS, its mechanisms are still not fully understood. In the dissertation various perturbation methods were adopted in order to …
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Adaptive Fiber Source for Label-free Nonlinear Microscopy
… degrees of freedom during multimodal nonlinear pulse propagation using a programmable fiber shaper that introduces time-dependent disorders. We achieve high spectral-temporal-spatial tunability in the output laser pulses of the MMF, resulting in a broadband high-peak-power source. We further …
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Using a high-speed plasma as a conducting channel to enable a novel antenna approach
… matching techniques. First, we consider the pulse-amplitude-modulated (PAM) signals fed into the time-varying antenna. Their characteristics and limitations in generating radiation are examined. Next, we begin to develop a model for the time-varying antenna by examining nanosecond pulse …
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Applications of light propagation in novel photonic devices
In this thesis, the propagation of light in novel photonic devices has been studied theoretically, numerically and experimentally. In particular, self-similar solutions to the nonlinear Schrödinger equation have been investigated as a means of avoiding distortions associated with high power pulse …
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Numerical modelling of dispersion managed soliton transmission
… the results of numerical modelling of the propagation of dispersion managed solitons. The theory of optical pulse propagation in single mode optical fibre is introduced specifically looking at the use of optical solitons for fibre communications. The numerical technique used to solve the …
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40Gbit/s dispersion managed soliton transmission
… Theoretical background is given on the propagation of pulses in optical fibres before extending the arguments to optical solitons, their applications and uses in communications. Dispersion management for transmission systems is introduced and then a brief explanation of quasi-linear …
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Damages in Transparent Materials by Ultrashort Laser Pulse
Ultrashort lasers that generate laser pulses down to picosecond and femtosecond range have advanced over the past decade from delicate lab systems to robust industry machines. The availability of stable ultrashort laser systems opens up a wide range of exciting applications from transparent …
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