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 23 for “"level crossing"”.
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Opportunistic Sampling by Level-Crossing
… addresses an alternative sampling method called level-crossing (LC). In recent years LC has emerged as an alternative to the traditional Nyquist-Shannon based sampling. While the conventional approach is an ideal enabler of reliable and perfect signal reconstruction, it is not always economical …
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Level Crossing Times in Mathematical Finance
<p>Level crossing times and their applications in finance are of importance, given certain threshold levels that represent the "desirable" or "sell" values of a stock. In this thesis, we make use of Wald's lemmas and various deep results from renewal theory, in the context of finance, in modelling …
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Reconstruction methods for level-crossing sampling
Level-crossing sampling refers to a sampling method that generates a sequence of timing samples when a signal crosses a specified set of levels. Conventional sampling techniques more typically rely on producing a sequence of amplitude samples at a specified set of timings. Level-crossing sampling …
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Optimisation of Rail-road Level Crossing Closing Time in a Heterogenous Railway Traffic: Towards Safety Improvement - South African Case Study
… with shared networks is the presence of the level crossings where railway and road traffic intersects. Thus, long waiting time is expected at the level crossings due to the increase in traffic volume and heterogeneity. Furthermore, safety and capacity can be severely compromised by long level …
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Effects of dissipative environments on some quantum systems
… the transition probability of the Landau-Zener level crossing. Chapter one contains a general introduction to these physical systems and a brief review of the theoretical methods I shall use. The study of an equilibrium property, the persistent current of a metallic ring coupled to an …
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Nitrogen-14 Nuclear Quadrupole Resonance Studies of Pyrimidine and Purine Derivatives
… are introduced to explain double resonance via level crossing (drlc), the experimental technique employed to detect ('14)N nqr resonances.
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Deuterium and Nitrogen-14 Nuclear Quadrupole Double Resonance Studies of Hydrogen Bonding
… experimental techniques of double resonance with level crossing and double resonance with continuous coupling were employed to detect quadrupolar transitions.
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Effects of dissipative environments on some quantum systems
… the transition probability of the Landau-Zener level crossing.
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On the simulations of correlated nakagami-m fading channels using sum-of-sinusoids method
… of this simulator and essential properties like Level Crossing Rate and Average Fade Duration. It has been found that simulation and theoretical results have very good fit. Furthermore, we extended this methodology to n-branch vector Nakagami-m fading channel for diversity reception. We have …
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An investigation into the factors affecting the perception of a train's travelling speed
Collisions between cars and trains at railway level crossing junctions continue to occur worldwide, despite efforts to reduce their frequency with educational and practical measures. Many of these collisions occur with car drivers attempting to cross the track in front of an approaching train. The …
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Born-Oppenheimer Corrections Near a Renner-Teller Crossing
… we prove that the wave functions and energy levels have asymptotic expansions in powers of ε, where ε4 is the ratio of an electron mass to the mass of a nucleus. To prove the validity of the expansion, we must prove various properties of the leading order equations and their solutions. The …
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Offshore wind turbine nonlinear wave loads and their statistics
… it with experimental measurements. The load level crossing rates and the load power spectral density is obtained in multiple sea states. The simulated nonlinear wave loads are applied as the forcing mechanism on the offshore wind turbine and its foundation, and the mudline bending moments are …
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Development of large scale tight-binding methods, and application to electron transfer in symmetric dielectric barrier discharges (DBDS)
… simulations is an ongoing effort at various levels of electronic structure theory. In tight-binding and density functional theory, the most expensive part of the computation is obtaining the density matrix, which traditionally scales cubically with the number of atoms. Tight-binding is a …
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A generic fault detection and diagnosis approach for pneumatic and electric driven railway assets
… electric point machine and the electro-hydraulic level crossing barrier, are considered as case studies. Based on their common dynamic characteristics, these assets are also known as Single Throw Mechanical Equipments (STMEs). A generic FDD method is proposed for these STMEs, which consists of …
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Statistical modeling for land mobile satellite communications
… new expressions are then used in models for the level crossing rate and average fade duration of a partially shadowed mobile. Comparisons are made to data reported for partially shadowed routes.
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NEW EDGE DETECTORS FOR CODED MARK INVERSION TRANSMISSION WITH ENHANCED PERFORMANCE
… CMl transmission which examines the threshold crossing of the received signal is proposed. The principle of the decoder is analogous to a level crossing problem. The performance of such a decoder is also analysed. In chapter 4, new edge detecting schemes to enhance the performance of the simple …
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Operational industrial fault detection and diagnosis: railway actuator case studies
… railways are required to operate with a high level of safety and reliability. The weakest components are those which have the highest safety requirements and the lowest inherent reliability. Single-throw mechanical actuators, such as powered train doors, trainstops, level crossing barriers and …
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Link Stability Analysis of Wireless Sensor Networks Over the Ocean Surface
… we present and prove an important theorem on the level-crossing of Wide Sense Stationary (WSS) random processes, and combine that with our stochastic model of LoS links to study two important indicators of link stability, i.e., the blockage probability and the blockage and connectivity periods. …
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MIMO channel modelling and simulation for cellular and mobile-to-mobile
… power spectral density, envelope level crossing rate, and average fade duration. A close agreement between some channel statistics obtained from the proposed reference model and measurement data is observed, confirming the utility of our model. Finally, we extend the above …
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Continuous-Time and Companding Digital Signal Processors Using Adaptivity and Asynchronous Techniques
… technique. The former operates only on level-crossing samples; the proposed methodology shows a potential for high-quality outputs by using a complex interpolation function. Finally, a companding DSP is presented for MPEG audio. Companding DSPs adapt their dynamic range to the amplitude …
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