The prospects for Unmanned Aerial Vehicles

In this study Andrew Brookes argues that Unmanned Aerial Vehicles (UAV) is the military fashion of the moment. Since the end of the 1990s many nations have added UAVs to their military inventories, and in 1999 half a dozen nations used UAVs over Kosovo. In the light of operational experience in Kosovo, Brookes re-evaluates the potential of this vehicle, and examines the roles, capabilities and future challenges of UAV

Lazy Evaluation and Delimited Control

The call-by-need lambda calculus provides an equational framework for reasoning syntactically about lazy evaluation. This paper examines its operational characteristics. By a series of reasoning steps, we systematically unpack the standard-order reduction relation of the calculus and discover a novel abstract machine definition which, like the calculus, goes "under lambdas." We prove that machine evaluation is equivalent to standard-order evaluation. Unlike traditional abstract machines, delimited control plays a significant role in the machine's behavior. In particular, the machine replaces the manipulation of a heap using store-based effects with disciplined management of the evaluation stack using control-based effects. In short, state is replaced with control. To further articulate this observation, we present a simulation of call-by-need in a call-by-value language using delimited control operations

Expression of oxidative stress response genes in Campylobacter jejuni biofilms / by David Andrew Brookes.

'Campylobacter jejuni' is a Gram-negative microaerophilic bacterium that is widely believed to be the number one cause of food borne gastroenteritis and diarrhea caused by bacteria. The ability to form biofilms may provide protection from oxygen by increasing the expression of genes responsible for oxidative stress protection. The genes that were tested were the ' Alkyl Hydroperoxide Reductase C (ahpC), Ferrodoxin (fdxA), Catalyse (katA) ', and 'Super Oxide Dismutase (sodB) genes, 16S rRNA' and 'Gyrase (gyrA) genes'. When 'C. jejuni' planktonic and biofilms cells were tested in microaerobic conditions there was no statistically significant differences in the expression of ' ahpC (p=0.139), katA (p=0.065), or sodB (p=0.136). There were differences mfdxAfdxA (p=0.008), gyrA (p=0.048), and 16S rRNA (p=0.002). Two methods of qRT-PCR were tested; there was no statistically significant difference between using an ABI Prism 7000, or the Cepheid Smart Cycler (p=0.776). There were also no differences between the use of either a One-Tube or Two Tube RT-PCR protocol (p=0.388). Differences were found in the ahpC (p=0.007), fdxAfdxA (p<0.001), and sodB (p<0.001) genes of C. jejuni when grown in aerobic or microaerobic biofilms

Situationist outdoor education in the country of lost children

This thesis is a study of outdoor education, in the deliberative tradition of curriculum inquiry. It examines the intentional generation and distribution of knowledge, beliefs, and attitudes through organised outdoor activities, both as a research interest, and as a critical perspective on outdoor education discourse. Eight separate but interrelated research projects, originally published in 11 refereed journal articles, develop and defend the thesis statement: The problem of determining what, if any, forms of outdoor experience should be educational priorities, and how those experiences should be distributed in communities and geographically – that is who goes where and does what – is inherently situational. The persistence of a universalist outdoor education discourse that fails to acknowledge or adequately account for social and geographic circumstances points to serious flaws in outdoor education research and theory, and impedes the development of more defensible outdoor education practices. The introduction explains how the eight projects cohere, and illustrates how they may be linked using the example of militaristic thinking in outdoor safety standards. Chapters 1 and 2 defend and elaborate a situationist approach to outdoor education, using the examples of outdoor education in Victoria (Australia), and universalist approaches to outdoor education in textbooks respectively. Chapters 3 and 4 expand on some epistemological implications of the thesis and examine, respectively, the cultural dimensions of outdoor experience, and the epistemology and ontology of local natural history. Chapters 5 and 6 apply a situationist epistemology to personal development based outdoor education. Traditions of outdoor education that draw on person-centred rather than situation-sensitive theories of behaviour are examined and critiqued. Alternatives to person-centred theories of outdoor education are discussed. Chapters 7 and 8 use situationist outdoor education to provide a critical reading of nature-based tourism. Chapters 9, 10, and 11 return to the theme of safety in the introduction and Chapter 1, and examine the safety implications of a situationist epistemology. Closing comments briefly draw together the conclusions of all of the chapters, and offer some directions for future outdoor education research

Flow Measurement Using Electron Beam Flourescence

Low density, high-speed flows are of interest to many research areas including, spacecraft thrusters, hypersonic vehicle control, and atmospheric re-entry studies. Measurement of low-density gas flows by traditional methods such as Schlieren Photography or Particle Image Velocimetry is often not possible. In order to yield new information about gas behavior at low densities the technique of electron beam fluorescence is being re-evaluated. By recreating previous electron beam fluorescence setups used to measure density, the experiment operating parameters including beam strength and density ranges are assessed and a foundation can be built for further experimentation. Comparing intensity plots of imaged flows against expected luminosity of fluoresced gases provides correlation data to assess necessary experiment conditions. Future work includes, using spectroscopy to determine gas density, composition, velocity and temperature

A critical argument in favour of theoretical pluralism: project failure and the many and varied limitations of project management

In project management, failure is often assumed to be evidence of deficient management: a problem that can be overcome by better management. Drawing on qualitative research within UK construction projects we examine how four different theoretical approaches (positivism, structural Marxism, interpretivism and actor–network theory) all challenge this managerial assumption. Each theoretical perspective enables a specific analysis of empirical data that critiques the notion that project failures are easily, simply, or largely, associated with the failure of project management. In so doing, our pluralist analysis reveals the social and political contextualization of performance in project management. We thus conclude by proposing that practitioner and scholarly concerns with project failure (and success), can actively contribute to attempts to reflect upon various matters of political concern as developed within the Making Projects Critical community, and by extension Critical Management Studies. Thus, we propose greater interaction between critical and mainstream project research communities

A ‘Strategy-as-Practice’ exploration of lean construction strategizing

A growing body of work emerging from the management and organizational studies literature is the ‘Strategy-as-Practice’ (SaP) perspective, which focuses on the ways in which strategy is actually enacted within organizational settings. This perspective is used to examine the diffusion of lean construction. In recent years lean construction has grown in prominence to become one of the primary performative improvement recipes for the construction sector. However, rather than providing a stable strategy around which more collaborative, intelligent and efficient project-based organizations develop, this research reveals how the lean concept transforms during its journey with unintended organizational consequences. An ethnographic case study, informed by SaP, demonstrates how a lean strategy and its effects on organizational practice and culture cannot be understood separately from material and embodied practices and power effects. As well as contributing to the examination of lean construction practice, the findings show how strategy is enacted within construction organizations and the ensuing effects of social power. A new trajectory is opened for research into strategizing within construction organizations, which provides ways to explore actual practices and spaces where strategizing occurs