Continental rifting is fundamental to the theory of plate tectonics, yet the force balance driving Earth's largest continental rift system, the East African Rift (EAR), remains debated. The EAR actively diverges the Nubian and Somalian plates spanning ∼5000 km N-S from the Red S…
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The causes of violent conflicts in Ethiopia in general, and in Gambella in particular, are complex. Critically examining and explaining the causes entails going beyond labelling them solely in terms of one variable, such as 'ethnic conflict‘. The contestation of the study is tha…
Recent accounts of workplace union representation have emphasised the exclusion of shop stewards from management decision-making processes, and have posited a shift in shop steward activity away from dealing with collective issues through bargaining, towards dealing with individ…
I present an overview of the tools and methods of gravitational dynamics motivated by a variety of dynamics problems. Particular focus will be given to the development of dynamic phase-space configurations as well as the distribution functions of collisionless systems. Chapter 1…
In this thesis, we investigate the collective electron dynamics in single and coupled superlattice systems under the influence of a DC electric field. Firstly, we illustrate that Bloch oscillations suppress electron transport and the resulting charge domains form self-sustained …
South Asia has the largest concentration of the world’s poor, with over half a billion people surviving on less than a dollar a day. One of the Millennium Development Goals (MDG) aims to halve the proportion of the world’s people whose income is less than one dollar a day and th…
This thesis deals with the emergence of the modern state in Iran under the Pahlavi regime from 1926. The emphasis of the examination is on the political encapsulation of two Iranian tribal groups, the Turkmen and the Baluch, and the effects their subordination by the Iranian sta…
Accuracy and efficiency are among the main factors that drive today's innovative disciplines. As technology rapidly advances, efficiency takes on new meanings but what about accuracy? How accurate is accurate? Human error, uncertainties in measurement, and rounding errors are ju…
During axial thrusting of a spin-stabilized spacecraft undergoing orbital injections or control maneuvers, misalignments and center-of-mass offset create undesired body-fixed torques. The effects of the body-fixed torques, which in turn cause velocity pointing errors, can be red…
Analysis on the dynamics of Israeli settlements in West Bank and East Jerusalem One of the most controversial international issues, consistently capturing the attention of the international community, is the expansion of the Israeli human settlements in the West Bank and East Je…
Modern surveys like NASA’s Kepler mission have collected a wealth of data in the search for Earth-like exoplanets. This vast quantity of data has enabled novel statistical investigations of the physical processes that shape the observed populations of stars and their planets. Th…
Presented in this dissertation are novel models and techniques to analyze the whirling vibration of drillstrings during oil and gas (O&G) operations. Mathematical models are developed to solve for the dynamic whirl response. For this purpose, the drillstring is modeled by a syst…