Longitudinal flying qualities criteria for single-pilot instrument flight operations

Modern estimation and control theory, flight testing, and statistical analysis were used to deduce flying qualities criteria for General Aviation Single Pilot Instrument Flight Rule (SPIFR) operations. The principal concern is that unsatisfactory aircraft dynamic response combined with high navigation/communication workload can produce problems of safety and efficiency. To alleviate these problems. The relative importance of these factors must be determined. This objective was achieved by flying SPIFR tasks with different aircraft dynamic configurations and assessing the effects of such variations under these conditions. The experimental results yielded quantitative indicators of pilot's performance and workload, and for each of them, multivariate regression was applied to evaluate several candidate flying qualities criteria

THE DETERMINANTS OF THE GOING PUBLIC DECISION: EVIDENCE FROM THE U.K.

Several theoretical papers have addressed the question of why firms raise public equity. However, direct empirical evidence on the characteristics of firms going public is scarce and limited to non-Anglo-Saxon contexts. Our research combines the analysis of ex ante and ex post characteristics of Initial Public Offering (IPO) companies to cast more light on the determinants of the going public decision in the UK. Some of our findings are consistent with prior empirical studies in other contexts: IPO probability depends positively on firm size and stock price levels. Results also suggest that a firm?s need to finance investments is not the main motive to go public, although this reason underlies the going public decision in a number of UK firms. Besides, contrary to the evidence shown by Pagano et al. (1998) for Italian IPOs, we find that UK firms do not go public to reduce debt since leverage is negatively related to the probability of going public. Finally, the relationship between profitability and the likelihood of an IPO for our whole IPO sample is negative and significant. Whether firms that go public have higher investment rates than other firms, as is the case of our survivor IPOs, the negative effect of profitability on the probability of going public may reflect the fact that these firms cannot yield sufficient internal funds to finance large investments. In fact, the relationship between profitability and the likelihood of an IPO becomes significantly positive for our acquired IPO group, where investment opportunities variables have no significant effect on the going public decision. This result is consistent with the portfolio rebalancing motive to go public.Initial Public Offerings, the Going Public Decision.

Communications software performance prediction

Software development can be costly and it is important that confidence in a software system be established as early as possible in the design process. Where the software supports communication services, it is essential that the resultant system will operate within certain performance constraints (e.g. response time). This paper gives an overview of work in progress on a collaborative project sponsored by BT which aims to offer performance predictions at an early stage in the software design process. The Permabase architecture enables object-oriented software designs to be combined with descriptions of the network configuration and workload as a basis for the input to a simulation model which can predict aspects of the performance of the system. The prototype implementation of the architecture uses a combination of linked design and simulation tools

The transition from adolescent inpatient care back to the community: Young people’s perspectives

Whilst the majority of adolescents receive support from mental health services in community settings, some have problems that reach a level of severity and complexity that requires admission to hospital. Little is known, however, about how the young person adjusts and reintegrates back home following discharge from an inpatient unit. Part 1 is a literature review evaluating the evidence-base of alternative provisions to inpatient care for children and young people with severe and complex mental health problems. A total of 13 studies were identified for inclusion, and five intervention types were classified. The majority of the studies reported positive outcomes, but the strength of their designs varied. Overall, the studies provided promising findings for the effectiveness of community-based interventions for children and adolescents with complex mental health needs. Part 2 is a qualitative study that explored adolescent inpatients’ anticipations about the transition from inpatient care back into the community, that was informed by Self Determination Theory (Deci & Ryan, 1980). Semi-structured interviews were conducted with 12 adolescent inpatients and transcripts were analysed using thematic analysis. The adolescents saw the transition back home as providing both opportunities (e.g. personal growth) and challenges (e.g. re-entering the “real world” and negative perceptions from others). Part 3 is a reflective discussion of the process of developing and carrying out the qualitative study. It focuses on three areas: issues of self-reflexivity, the process of interviewing adolescents, and the tensions of balancing a phenomenological approach whilst being informed by a theoretical framework

Approximate theoretical performance evaluation for a diverging rocket

A simplified combustion model, which is motivated by available performance studies on the diverging rocket reactor, has been used as basis for an engine performance evaluation. Comparison with conventional rocket configurations shows that an upper performance limit for the diverging reactor is comparable with performance estimates for engines using an adiabatic work cycle. Development of the diverging reactor for engine applications may, however, offer some advantages for very hot, high-energy, propellant systems

A comparison of silent reading and listening through written recall and multiple choice type tests; grades 6 and 7.

Thesis (Ed.M.)--Boston Universit

Bibliography of the computer codes literature examined by the Radiation Shielding Information Center

Bibliography of computer codes on radiation and nuclear shieldin