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 11 of 11 for “"Level crossings"”.
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Multi-criteria design analysis of sensor systems for railway level crossings
The prevention of railway accidents on level crossings is of critical importance for railway companies because of their high frequency and considerable severity. As a countermeasure against the accidents, obstacle detection systems are widely installed and used in a large number of level crossings …
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Fast Waveform Pattern Matching With Significant-Point Frames
… tree record migrations and disappearances of the level-crossings of linear differential operators across multiple convolutions. These structures can be viewed as compressed, hierarchical representations of the signal, and have served as bases of successful systems for pattern matching The interval …
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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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The density of complex zeros of random sums
… on the unit circle. We further study the level crossings and answer the question about the expected number of complex zeros for coefficients with nonvanishing mean values and distinct variances.
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Spin-sensitive probes of triplet excitons in organic semiconductors
… and use of photoluminescence-detected avoided level-crossings in applied magnetic fields to quantify the strength of exchange coupling and identify specific optical signatures of exchange-coupled triplet pairs. Using high magnetic fields ($\leq\mbox{60 T}$) we isolate and measure the exchange …
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Long-range interatomic interactions: Oscillatory tails and hyperfine perturbations
… splitting.</p> <p>The |2P<sub>1/2</sub>⟩ levels, which are displaced from the reference 2S-levels just by the Lamb shift, make the study of hyperfine resolved 2S-2S system very interesting. Each S and P state have a hyperfine singlet and a triplet. Thus, there are 8-hyperfine states per …
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Quantitative analyses of train derailment probability at highway-rail grade crossings
… of collisions and highway user casualties at crossings. However, these two metrics do not encompass all crossing risks. Specifically, they do not consider the potential for grade crossing incidents to cause train derailments and the consequent casualties to passengers and crew members, …
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Electronic and optical properties of InAs nanocrystals
… our data with the experimental valence inter- sublevel transitions and the almost complete overlap of the latter with STM measure- ments, we question the simplistic attribution of the observed STM peaks obtained for negative bias. Motivated by the excellent agreement of our calculated results with …
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Conical Intersections and Avoided Crossings of Electronic Energy Levels
… and more. Secondly, we study codimension 2 crossings by considering a more general type of wave packet. We focus on the case of Schrödinger equation but our methods are general enough to be adapted to other systems with the geometric conditions therein. The motivation comes from the …
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Numerical studies on many-body localization
… of eigenstates in energy, which avoid level crossings every time their energy gap is small. The hybridization of eigenstates with each other involves only local regions of the system in the MBL phase, ignores locality in the ergodic phase, and is range-independent at the transition. …
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Topological phases, non-equilibrium dynamics and parallels of black hole phenomena in condensed matter
… critical properties of the MBS wavefunctions and level crossings near zero energy. These results could provide directions for making measurements on zero-bias conductance oscillations and the parameter range of operations for robust parity switches in realistic disordered system. On the front of …