Boundary layer integral matrix procedure: Verification of models

The three turbulent models currently available in the JANNAF version of the Aerotherm Boundary Layer Integral Matrix Procedure (BLIMP-J) code were studied. The BLIMP-J program is the standard prediction method for boundary layer effects in liquid rocket engine thrust chambers. Experimental data from flow fields with large edge-to-wall temperature ratios are compared to the predictions of the three turbulence models contained in BLIMP-J. In addition, test conditions necessary to generate additional data on a flat plate or in a nozzle are given. It is concluded that the Cebeci-Smith turbulence model be the recommended model for the prediction of boundary layer effects in liquid rocket engines. In addition, the effects of homogeneous chemical reaction kinetics were examined for a hydrogen/oxygen system. Results show that for most flows, kinetics are probably only significant for stoichiometric mixture ratios

NASA-Ames three-dimensional potential flow analysis system (POTFAN) equation solver code (SOLN) version 1

A computer program known as SOLN was developed as an independent segment of the NASA-Ames three-dimensional potential flow analysis systems of linear algebraic equations. Methods used include: LU decomposition, Householder's method, a partitioning scheme, and a block successive relaxation method. Due to the independent modular nature of the program, it may be used by itself and not necessarily in conjunction with other segments of the POTFAN system

An exploration of young people’s narratives of hope following experience of psychosis

Aims: To expand understandings of how young people with psychosis experience hope. This included to which factors young people attributed changes in their hopefulness and the role played by professionals and others with lived experience. Method: Ten young people recovering from an experience of psychosis were interviewed using narrative methodology. Results: The experience of hope as an overarching strand throughout the narratives had three common elements: sense of belonging, which included social inclusion, the importance of information and the significance of planning and occupation. Professionals played an important role in facilitating small steps forwards. Conclusions: The findings suggest the importance to young people of a sense of belonging and achieving small goals to facilitate hopeful thinking and, for clinicians, the value of supporting new peer relationships and meaningful occupation

Calculation of three-dimensional compressible laminar and turbulent boundary flows. Three-dimensional compressible boundary layers of reacting gases over realistic configurations

A three-dimensional boundary-layer code was developed for particular application to realistic hypersonic aircraft. It is very general and can be applied to a wide variety of boundary-layer flows. Laminar, transitional, and fully turbulent flows of compressible, reacting gases are efficiently calculated by use of the code. A body-oriented orthogonal coordinate system is used for the calculation and the user has complete freedom in specifying the coordinate system within the restrictions that one coordinate must be normal to the surface and the three coordinates must be mutually orthogonal

Fostering Resilience and Adapting to Climate Change in the Canadian North— Implications for Infrastructure in the Proposed Canadian Northern Corridor

The Canadian Northern Corridor (CNC) has been proposed to overcome gaps in the northern transportation system that limit social and economic development in the Canadian North (Fellows et al. 2020). Intended to be a multimodal transportation right- of-way through Canada’s North, the CNC seeks to capitalize on shifting global markets and increased access to northern resources (Pearce et al. 2020; Fellows et al. 2020). However, transportation infrastructure has remained constrained across northern Canada. Significant challenges exist for northern infrastructure due to isolation, restricted access and extraordinary environmental conditions — all of which climate change is projected to radically intensify (Palko and Lemmen 2017; Pearce et al. 2020). Climate change drastically reduces the feasibility of expanding northern infrastructure. Significant increases in environmental risk threaten existing infrastructure and magnify maintenance costs. Adaptation in remote northern locations can be exceedingly difficult and costly (Palko and Lemmen 2017). Additional Arctic warming is guaranteed to have systemic effects and pose significant challenges for northern infrastructure: temperature and precipitation will continue to increase; permafrost thaw will be amplified through changes in seasonal snow cover and land ice; ice loss of mountain and polar glaciers is virtually certain; coastal impacts such as erosion and storm surges will be magnified by increasing sea level and extreme volatility; and Arctic sea ice extent will decline to the point of likely being practically ice free in September before 2050 (IPCC 2021). Determining how to facilitate long-term, effective climate change adaptation is critical to overcome these challenges. Adaptation planning seeks to anticipate and mitigate the risks that result from climate change. This is done through two methods: hard and soft adaptation. Hard adaptations provide a physical barrier to the source of risk, such as a sea wall. In contrast, soft adaptations reduce risk by adjusting human behaviour through a variety of methods, including regulating development out of high-risk areas through land use bylaws or development permits, and fostering environmental stewardship to bolster ecosystem services, such as wetland preservation to reduce flooding (Bonnett and Birchall 2020). However, common misunderstandings about which adaptation initiatives are effective often disable adaptation planning (Kehler and Birchall 2021). This often results in maladaptation — when adaptation measures result in unintended negative consequences that further increase risks. Hard infrastructure adaptations intended to reduce physical risk, despite typically being used as the foundation of adaptation planning, magnify the risk of maladaptation when used alone (Bonnett and Birchall 2020). Due to the capital-intensive nature of hard measures, both upfront and in long- term maintenance, and their predisposition to environmental degradation, the need to go beyond hard measures to address vulnerability is well understood (Bonnett and Birchall 2020; Kehler and Birchall 2021; Naylor et al. 2020). Adapting infrastructure to climate change in the Canadian North presents a formidable challenge. Limits and constraints to effective adaptation, such as lagging implementation, isolation, low population and limited tax base to fund local-level adaptation and infrastructure maintenance, result in significant challenges and limited capacity to overcome them (Bonnett and Birchall 2020; Birchall and Bonnett 2020; Birchall et al. 2021; Ford et al. 2015). While climate change is perceived to have the potential to increase access to the North — allowing trade, tourism and transport of much-needed goods and services to northern communities — in reality, existing and new construction will be progressively vulnerable to unprecedented climatic effects and the resulting infrastructure maintenance will grow increasingly costly. This increase in vulnerability and costs is likely to restrict the anticipated socioeconomic boons of expanded connectivity and resource development, potentially straining already vulnerable communities and Indigenous Peoples. Considerable uncertainty requires a planning approach to infrastructure adaptation that focuses on mitigating risks of climate change while also bolstering community resilience. Infrastructure expansion such as the CNC necessitates adaptation planning that includes fostering economic diversity and infrastructure resilience. Increased disaster risk due to climate change could push communities already overwhelmed by maintenance and adaptation to being unable to cope, resulting in vulnerabilities across northern Canada. Balancing hard adaptations with other forms of policy, such as soft adaptations intended to increase adaptive capacity and adaptation readiness, is critical to avoid maladaptation of infrastructure. Regardless of cost or feasibility, for infrastructure adaptation to be effective it must coincide with a reduction of socioeconomic stressors, and all decision making must be done through a localized, participatory and equitable process (IPCC 2014). Addressing adaptation and resilience for northern infrastructure requires exploring what is necessary to foster resilience, examining what avenues for adaptation are most effective and then maximizing the benefits of limited funding allocated toward these strategies. Effective adaptation strategies focus on the reduction of vulnerability through place- and context-specific approaches, using low-risk, high-benefit policy measures that are supported through significant intergovernmental co-operation, public engagement and integration of non-Western knowledge systems. By further understanding the pathways to achieve resilience, and through a holistic approach to adaptation, it is possible to balance the increased environmental risks of climate change with socioeconomic impacts, and to do so in a way that is economically sustainable long into the future

Guidelines for monitoring the success of peatland restoration

The aim of this guidance is to provide information to enable peatland restoration projects to develop appropriate monitoring programmes. Degraded peatlands are restored for a wide range of reasons. Restoration objectives can include protecting and enhancing biodiversity, improving water quality, reducing flood risk and protecting cultural heritage or carbon stores. Restoration projects need monitoring programmes to show whether these objectives are being met and to help them to adapt practices to respond to environmental changes

A review of techniques for monitoring the success of peatland restoration

An important element of all peatland restorationprojects is a programme of monitoring to checkresults and progress. Several peat projectworkshops identified a demand for technicalguidance on monitoring techniques. So NaturalEngland commissioned this study to: -Review the range of peatland restorationmonitoring techniques available. -Identify those that were consistent, informativeand easily applicable for peatland restorationprojects at a range of scales and budgets.Tables to identify appropriate monitoringtechniques for specific projects are published inthe Technical Information Note TIN097 -Guidelines for monitoring peatland restoration.Further information on these techniques isprovided in this report.The findings of this study have been used to: -Inform the JNCC project to design a researchprogramme on UK Peatland Green House Gasand Carbon Flux. -Develop thinking on monitoring peatlands inthe IUCN UK Peatland Programme. -Inform hydrological monitoring programmes forthe Dartmoor and Exmoor Mires Project.These findings are being disseminated to: -Encourage the use of balanced and consistentapproaches to peatland restoration monitoring. -Develop consistency in monitoring approachesso as to enable possible future collation ofpeatland monitoring data as a single databaseresource.A single database resource of peatlandrestoration would enable more robust analysesof monitoring data to support the developmentand implementation of future support andmanagement techniques for peatlandrestoration

Affect - an ethnocentric encounter?: Exploring the 'universalist' imperative of emotional/affectual geographies

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‘They Called Them Communists Then … What D'You Call ‘Em Now? … Insurgents?’. Narratives of British Military Expatriates in the Context of the New Imperialism

This paper addresses the question of the extent to which the colonial past provides material for contemporary actors' understanding of difference. The research from which the paper is drawn involved interview and ethnographic work in three largely white working-class estates in an English provincial city. For this paper we focus on ten life-history interviews with older participants who had spent some time abroad in the British military. Our analysis adopts a postcolonial framework because research participants' current constructions of an amorphous 'Other' (labelled variously as black people, immigrants, foreigners, asylum-seekers or Muslims) reveal strong continuities with discourses deployed by the same individuals to narrate their past experiences of living and working as either military expatriates or spouses during British colonial rule. Theoretically, the paper engages with the work of Frantz Fanon and Edward Said. In keeping with a postcolonial approach, we work against essentialised notions of identity based on 'race' or class. Although we establish continuity between white working-class military emigration in the past and contemporary racialised discourses, we argue that the latter are not class-specific, being as much the creations of the middle-class media and political elite

Memory Inflation during Chronic Viral Infection Is Maintained by Continuous Production of Short-Lived, Functional T Cells

SummaryDuring persistent murine cytomegalovirus (MCMV) infection, the T cell response is maintained at extremely high intensity for the life of the host. These cells closely resemble human CMV-specific cells, which compose a major component of the peripheral T cell compartment in most people. Despite a phenotype that suggests extensive antigen-driven differentiation, MCMV-specific T cells remain functional and respond vigorously to viral challenge. We hypothesized that a low rate of antigen-driven proliferation would account for the maintenance of this population. Instead, we found that most of these cells divided only sporadically in chronically infected hosts and had a short half-life in circulation. The overall population was supported, at least in part, by memory T cells primed early in infection, as well as by recruitment of naive T cells at late times. Thus, these data show that memory inflation is maintained by a continuous replacement of short-lived, functional cells during chronic MCMV infection