Analysis of error propagation in aircraft inertial navigation systems

Analysis of error propagation in aircraft inertial guidance systems using flight simulation and mathematical model

Tracking solutions in tachyon cosmology

We perform a thorough phase-plane analysis of the flow defined by the equations of motion of a FRW universe filled with a tachyonic fluid plus a barotropic one. The tachyon potential is assumed to be of inverse square form, thus allowing for a two-dimensional autonomous system of equations. The Friedmann constraint, combined with a convenient choice of coordinates, renders the physical state compact. We find the fixed-point solutions, and discuss whether they represent attractors or not. The way the two fluids contribute at late-times to the fractional energy density depends on how fast the barotropic fluid redshifts. If it does it fast enough, the tachyonic fluid takes over at late times, but if the opposite happens, the situation will not be completely dominated by the barotropic fluid; instead there will be a residual non-negligible contribution from the tachyon subject to restrictions coming from nucleosynthesis.Comment: 5 pages, 4 figure

A tough high performance composite matrix

This invention is a semi-interpenetrating polymer network which includes a high performance thermosetting polyimide having a nadic end group acting as a crosslinking site and a high performance linear thermoplastic polyimide. An improved high temperature matrix resin is provided which is capable of performing in the 200 to 300 C range. This resin has significantly improved toughness and microcracking resistance, excellent processability, mechanical performance and moisture and solvent resistances

An Examination of the Experiences of BAME Students in the Community and Criminal Justice Division

Freedom to Achieve is De Montfort University’s commitment to its students, whatever their ethnicity, to ensure there is an equal playing field. The attainment gap between Black, Asian and Minority Ethnic (BAME)1 and white students within UK Higher Education (HE) is well documented and DMU are part of a ground-breaking project to positively address this issue. As part of this multi-faceted programme, the Community and Criminal Justice Division (CCJ) undertook a pilot study to explore our BAME students’ experiences at the university. The aim of these results is to help establish preliminary short term and long term strategies to help deliver overall improvements in the BAME attainment gap and aspirations to achieve at DMU. After undertaking a survey of BAME students within the CCJ, a series of key thematic areas emerged, namely: 1) Assessments, 2) Discrimination, 3) Diversity, 4) Lecture Style, 5) Support, and 6) Universal Design for Learning. We examine and explore these issues in relation to three key theoretical models used to explore BAME attainment in Higher Education. Nigrescence Theory, Social Identity Theory, and Critical Race Theory are all used to help understand the experiences of BAME students. Using the results, we have identified a series of short and long term recommendations that could be utilised to ensure and take steps towards addressing the attainment gap between BAME and White students at DMU

‘Do we all get a PhD?' Attempting emancipatory research relating to disability in an academic environment. Relating to disability in an academic environment

Within the model of emancipatory research, the researcher is situated as one member of a team. They are often conceptualised as providing methodological tools and skills to others involved in the research project but the definition of topic, data analysis and dissemination is presented as a joint enterprise. This model of research (deliberately) contradicts with the view of the expert researcher prevalent within higher education establishments and particularly with the individualised construction of research degrees such as PhDs which requires a thesis to be the exclusive product of one individual. The paper discusses attempts which have been made to reconcile the tensions inherent in adopting an emancipatory model within an academic environment including our own experiences of researching and supervising a doctoral thesis on citizenship and disability. The project is led by an advisory panel of disabled people who are involved in the preparation, selection and analysis of the interviews and pragmatic aspects of attempting such an emancipatory model of research from the viewpoint of the entire research team. It raises the question as to whether such models can only be completely adhered to in particular, probably non-academic settings

Invariant states and rates of Convergence for a critical fluid model of a processor sharing queue

This paper contains an asymptotic analysis of a fluid model for a heavily loaded processor sharing queue. Specifically, we consider the behavior of solutions of critical fluid models as time approaches \infty. The main theorems of the paper provide sufficient conditions for a fluid model solution to converge to an invariant state and, under slightly more restrictive assumptions, provide a rate of convergence. These results are used in a related work by Gromoll for establishing a heavy traffic diffusion approximation for a processor sharing queue