Thermodynamics and structural relationships in the lanthanum-nickel-oxygen system

Imperial Users onl

A qualitative investigation of the attitudes and practices of farmers and veterinarians in Wales regarding anthelmintic resistance in cattle

Despite the importance of stakeholder practices in the potential development of anthelmintic resistance (AR) in livestock, there is a lack of qualitative research examining the attitudes and behaviours of anthelmintic end users and their professional advisors. Given the increasing importance of developing anthelmintic resistance patterns in cattle, and the need to avoid AR in cattle developing to the same extent as it has in sheep, the objective of this qualitative study was therefore to assess the factors affecting anthelmintic product choice and usage, and awareness and attitudes towards AR in cattle in north Wales. Twelve semi-structured face-to-face interviews were conducted with nine cattle farmers and three veterinarians. Farmer knowledge and engagement with the issue of AR in cattle in this study was low. A lack of perceived threat was apparent, with only a demonstrable problem at farm level the likely incentive to change future worming protocols and practice. Cost had a very prominent influence on anthelmintic product choice, but importance was also given to product recommendations from social farming networks and other non-veterinary advisory sources. A more proactive approach should be taken to raise farmers’ and veterinarians’ awareness of increasing levels of AR in cattle and improve anthelmintic governance

The Vegetation and Flora of Edwards Air Force Base, Western Mojave Desert, California

Edwards Air Force Base extends over 121,000 ha in the Antelope Valley of the western Mojave Desert, with much of the area part of a closed endorheic basin that held the Pleistocene Lake Thompson. Notable topographic features are Rogers, Rosamond and Buckhorn dry lakes, while rounded domes and scattered hills are present to the north and east. Elevation gradients are limited, ranging from a low of 690 m to 1044 m near the eastern margin. Diverse communities of saltbush scrub dominate the lower plains, while creosote bush scrub and Joshua tree woodlands are present away from the old lake basin. In many ways EAFB is a biogeographic crossroads with the broader central Mojave Desert to the east, Owens Valley and Great Basin to the north, and cismontane Central Valley and foothills to the west. The flora as currently known contains 403 vascular plant taxa, with 324 (80%) of these native. The eight largest families comprise more than 68% of the flora, led by the Asteraceae with 84 taxa (72 native). Annual plants make up over two-thirds of the total flora

Debye Potentials for Maxwell and Dirac Fields from a Generalisation of the Killing-Yano Equation

By using conformal Killing-Yano tensors, and their generalisations, we obtain scalar potentials for both the source-free Maxwell and massless Dirac equations. For each of these equations we construct, from conformal Killing-Yano tensors, symmetry operators that map any solution to another.Comment: 35 pages, plain Te

Comment on 'Numerical assessment and comparison of pulse wave velocity methods aiming at measuring aortic stiffness'

A recent numerical study investigated the potential utility of peripheral PWV measurements for assessing aortic stiffness by simulating pulse wave propagation through the arterial tree. In this Comment we provide additional analysis of the simulations in which arterial compliances were changed. The analysis indicates that relationships between aortic and peripheral pulse transit times (PTTs) may not be constant when compliances change. Consequently, peripheral PWV measurements may have greatest utility in particular clinical settings in which either: an assumption can be made about possible changes in compliance, allowing aortic PTT to be estimated from peripheral PTT; or, one wishes to assess changes in peripheral PWV over time

SPATIAL FUTURES: ASPIRATIONS AND ACTIONS REGARDING FORM AND SPATIAL CHANGE IN JOHANNESBURG

A report for Group Strategy, Policy Coordination and Relations, City of JohannesburgAddressing the racially divided, sprawling and socially inequitable spatial form of South African cities has been key to strategic spatial planning and urban spatial frameworks in South African cities, including in Johannesburg. These ideas were included in the Johannesburg 2006 Growth and Development Strategy (GDS), and in the 2011 GDS, which focused more strongly on resilience, but making strong links to spatial form. They have also been a consistent element of various rounds of Johannesburg Spatial Development Frameworks (SDFs). However, despite several of these concerns being embodied in national urban and city policies, objectives to restructure cities spatially have proven to be very difficult to achieve, and there is a growing frustration and questioning of whether some of these objectives are still appropriate. At the same time, the urban restructuring agenda, and the areas that spatial policy addresses have been constrained in practice, and there are several gaps and silences in the issues that are addressed. This paper provides a discussion of the choices, tensions, and trade-offs facing spatial policy in Johannesburg. It considers whether the policy objectives expressed in existing spatial policies (including the Johannesburg GDS and SDF) are still relevant, and address key spatial dynamics and issues. It does this by exploring several key areas of debate around the spatial form of cities and spatial policy internationally, examining how they manifest in Johannesburg, and highlighting these choices, tensions and trade-offs. It recognises, as a starting point, that while urban spatial policies have some power to shape spatial change, spatial trends and dynamics occur in a complex environment, where there are many drivers and shapers of spatial change. As emphasised in the position paper on ‘Strategic Planning in a Turbulent and Uncertain Context’, spatial policies that hope to influence spatial change need to understand the (shifting) key trends and drivers that affect space, including demographic, economic and social patterns that influence the demand for space. There are many examples of spatial plans which missed key trends, vastly over- or under- estimated population growth, and consequently planned for spatial forms which proved to be inappropriate. The spatial form of cities is also shaped by markets of various forms. Planning may attempt to engage with and regulate or direct these markets in the interests of its social and spatial goals and objectives, but it does not have completely free reign. Further, there are frequently disjunctures between strategic spatial planning and implementation, reflecting limits in terms of capacity, political will, institutional cooperation/integration and other factors. Finally, city spatial policies do not occur in isolation, nor do spatial policies necessarily have the power desired by planners. Spatial change and spatial form is critically affected by infrastructural investments, particularly in relation to transport (roads, transit systems), which are frequently follow a different planning process and logic (UN-Habitat, 2009). Likewise, differences between spheres of government and sectoral departments with power to invest in the built environment are also key to the disjunctures between spatial plans and outcomes. The emphasis on housing delivery on scale, along with cheaper land on the periphery, has undermined spatial policies towards urban compaction both internationally (Buckley et al., 2016) and in South Africa (Charlton, 2014). The recent international emphasis on ‘mega- projects’ is often driven by the private sector (such as major gated estates), but also by parts of the public sector (for example eThekwini’s airport). It is also influencing spatial change, bypassing spatial plans or forcing their adaptation (Shatkin, 2008; Robbins et al, 2015; Todes, 2014). This paper explores several key points of focus and debate affecting the spatial futures of cities, particularly in relation to Johannesburg. It draws out the key choices, tensions and trade-offs in these areas, and their implications for future spatial planning in Johannesburg. These include: • The debate over the creation of a more compact urban form, versus expanding and sprawling cities, including the discussion of new cities and satellite cities. Sustainability and resilience as key discourses and their implications for urban spatial form, and the role of transport and mobility will be considered in this context. Understandings of densification, how it is encouraged and managed will also be discussed. • Trends towards social exclusion versus arguments for spatial justice and the right to the city. This discussion considers trends towards privatised and splintered urbanism, gated communities, gentrification, and safety and security as a driver. It also discusses other dimensions of exclusion/inclusion—race, gender and the question of migrant spaces, and policies on socio-spatial integration. • Processes of spatial change in poor neighbourhoods, and initiatives to improve conditions there, including upgrading informal settlements, the growth of informal trade, addressing backyard housing. • Relationships between space and economic development, including the dynamics of growth and decline across the city, debates over promoting development on the periphery versus existing areas of agglomeration, and initiatives to promote economic development in townships. • City-region and multi-scalar governance, including the extent to which metropolitan governance addresses competing tensions and interests across the city, cross-border issues, and disjunctures and tensions between spheres of government.A report for Group Strategy, Policy Coordination and Relations, City of JohannesburgAA201

Strategic Planning in a Turbulent and Uncertain Context`

A report for Group Strategy, Policy Coordination and Relations, City of JohannesburgUncertainty and turbulence is a perennial feature of the context within which cities must plan but there are time periods in which a sense of uncertainty is heightened. This has been the case in the period since the Global Financial Crisis of 2007/08 where the experience of uncertainty has reached levels not known since the Great Depression of the 1930s. The Financial Crisis was an ‘uncertainty shock’ but it has left tremors in its aftermath. As one commentator put it, the recovery from the crisis has been “anaemic, brittle and fraught with uncertainty” (Tyson 2015). The combination of economic uncertainty in the contemporary period with political turbulence, global terrorism, and anxieties over climate change has created a ‘perfect storm’ of uncertainty. Wiltbank et al. (2006) write that “unknowability (true unpredictability) can be a disquieting and disruptive phenomenon.” This is especially so for the activity we call ‘planning’ which, almost by definition, requires some degree of confidence in our expectations for the future. The legitimacy of planning depends on the extent to which is can handle radical uncertainty. While the more traditional forms of planning may be helpless in the face of this uncertainty, there are, fortunately, approaches to planning within contexts of uncertainty that have evolved in both corporate and public sector planning practice since at least the late 1960s. In this paper we begin by outlining some of the dimensions of uncertainty, both globally and for the context of Johannesburg, focussing on aspects relating to demography, environmental threats, economy, society and politics, acknowledging, of course, that these are all profoundly interrelated. We then explore the multifaceted literature on planning for uncertainty, using the framework provided by Wiltbank et al. (2006) which distinguishes between approaches which are concerned with the better positioning of an institution within an uncertain environment, and those which actively attempt to shape environments. We apply the useful elements of the varying approaches to a brief analysis of Johannesburg’s current Growth and Development Strategy (GDS) exploring the extent to which the GDS has successfully accommodated uncertainty. We conclude with recommendations on how a new or revised GDS may better respond to uncertainty. Our approach to this study is broadly informed by a key insight offered by Peter Drucker in his seminal piece, ‘Planning for Uncertainty’ published in The Wall Street Journal in 1992. Drucker asked the question “What must we do––in fact, what must we become––if we are to successfully navigate the treacherous waters of unpredictability?” He argues, with reference to corporate planning but with relevance to public sector planning, that traditional approaches to dealing with uncertainty are not helpful: Uncertainty––in the economy, society, politics––has become so great as to render futile, if not counterproductive, the kind of planning most companies still practice: forecasting based on probabilities. (Drucker 1992) Drucker suggests an alternative approach to thinking about the future. Instead of asking “what is most likely to happen?" planning for uncertainty asks, instead, “what has already happened that will create the future?” This is the approach we take below in outlining dimensions of uncertainty. Our analysis is not futuristic and speculative but rather asks what the existing or emergent trends, and identified risks, are and what this may mean for the future. The reality, of course, is that the future is thoroughly unpredictable and we can only present these dimensions as illustrative of the scope of uncertainty and not as the basis of any form of projection. More important, appreciating these sorts of uncertainties, is how we can proceed with non-predictive forms of planning. A critical question that will address further in the text is whether our planning should focus only on adapting to uncertainty, or whether it should actively seek to shape the nature of the uncertainty. We do not assume that uncertainty is necessarily negative. In the corporate literature, at least, there is a strong recognition that uncertainty brings opportunity. This is arguably also the case in planning for the future of large and complex cities. Kaplan (2008) writes that, with uncertainty “often the basic meaning of a situation is up for grabs”. With uncertainty comes the opportunity to rewrite scripts in more desirable ways. However, there are massive risks if trends are misread or ignored.A report for Group Strategy, Policy Coordination and Relations, City of JohannesburgAA201

Influence of mental stress on the pulse wave features of photoplethysmograms.

Mental stress is a major burden for our society. Invasive and non-invasive methods have been proposed to monitor and quantify it using various sensors on and off body. In this Letter, the authors investigated the use of the arm photoplethysmogram (PPG) to assess mental stress in laboratory conditions. Results were in correspondence with their previous in-silico study which guided the present study. Three wave shape parameters were identified for stress assessment from the PPG signal: (i) the time from dicrotic notch to end diastole; (ii) the time from pulse onset to systolic peak; and (iii) the ratio of diastolic to systolic area. The proposed in-vivo results showed that the two first parameters responded significantly to increased mental stress and to a breathing relaxation procedure, complementing heart rate, heart rate variability, and pulse transit time as indices of stress

Universal language development screening : comparative performance of two questionnaires

Acknowledgments The authors would like to acknowledge other members of the “Early Identification” team: Professor Sue Roulstone and Caitlin Holme from the Bristol Speech and Language Therapy Research Unit, Rose Watson from Newcastle University, and Sheena Carr and Renvia Mason from Public Health England for their support throughout the project. Finally, we would like to thank the children and their families who attended the clinics and the health visitors and speech and language therapists who were involved in collecting data for the project.Peer reviewedPublisher PD