The Dynamic Monte Carlo Method for Transient Analysis of Nuclear Reactors

In this thesis a new method for the analysis of power transients in a nuclear reactor is developed, which is more accurate than the present state-of-the-art methods. Transient analysis is important tool when designing nuclear reactors, since they predict the behaviour of a reactor during changing conditions, such as a control-rod movement,...

Numerical simulations of rarefied gas flows in thin film processes

Many processes exist in which a thin film is deposited from the gas phase, e.g. Chemical Vapor Deposition (CVD). These processes are operated at ever decreasing reactor operating pressures and with ever decreasing wafer feature dimensions, reaching into the rarefied flow regime. As numerical simulation tools are frequently used to design and...

Direct simulation and regularization modeling of turbulent thermal convection

This dissertation focuses on turbulent thermal convection, which occurs in a wide range of geophysical and engineering situations, such as the atmosphere, the sun, the earth's mantle, indoor climates etc. The first part of the thesis comprises a fundamental study of Rayleigh-BÉnard convection in a domain with aspect-ratio four. An ensemble of...

Adaptive motion compensation in sonar array processing

In recent years, sonar performance has mainly improved via a significant increase in array ap-erture, signal bandwidth and computational power. This thesis aims at improving sonar array processing techniques based on these three steps forward. In applications such as anti-submarine warfare and mine hunting motion of the sonar needs to be...

Condition monitoring for marine refrigeration plants based on process models

Over the last decades the reliability, availability and safety of ships has become increasingly important. The cost and safety risks of ships have increased with the size, and the complexity has led to extensive automation. Many parameters, variables and alarms are available simultaneously for evaluation, but the small crew has many tasks they...

Atomistic simulation of Cu-Ta thin film deposition and other phenomena

Tantalum (Ta) is a metal with good properties to act as a diffusion barrier material in computer chips, where it should prevent the mixing of Cu into Si and SiO. The deposition of thin Cu films onto various Ta substrates has been studied through molecular dynamics simulations, using either empirical EAM potentials or Density Functional Theory ...