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Search Results: 1 - 10 of 1964 matches for " Emma Beynon "
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Weak lensing predictions for modified gravities at non-linear scales
Emma Beynon,David J. Bacon,Kazuya Koyama
Physics , 2009, DOI: 10.1111/j.1365-2966.2009.16117.x
Abstract: We present a set of predictions for weak lensing correlation functions in the context of modified gravity models, including a prescription for the impact of the nonlinear power spectrum regime in these models. We consider the DGP and f(R) models, together with dark energy models with the same expansion history. We use the requirement that gravity is close to GR on small scales to estimate the non-linear power for these models. We then calculate weak lensing statistics, showing their behaviour as a function of scale and redshift, and present predictions for measurement accuracy with future lensing surveys, taking into account cosmic variance and galaxy shape noise. We demonstrate the improved discriminatory power of weak lensing for testing modified gravities once the nonlinear power spectrum contribution has been included. We also examine the ability of future lensing surveys to constrain a parameterisation of the non-linear power spectrum, including sensitivity to the growth factor.
Weak lensing predictions for coupled dark energy cosmologies at non-linear scales
Emma Beynon,Marco Baldi,David J. Bacon,Kazuya Koyama,Cristiano Sabiu
Physics , 2011, DOI: 10.1111/j.1365-2966.2012.20864.x
Abstract: We present non-linear weak lensing predictions for coupled dark energy models using the CoDECS simulations. We calculate the shear correlation function and error covariance expected for these models, for forthcoming ground-based (such as DES) and space-based (Euclid) weak lensing surveys. We obtain predictions for the discriminatory power of a ground-based survey similar to DES and a space-based survey such as Euclid in distinguishing between $\Lambda$CDM and coupled dark energy models; we show that using the non-linear lensing signal we could discriminate between $\Lambda$CDM and exponential constant coupling models with $\beta_0\geq0.1$ at $4\sigma$ confidence level with a DES-like survey, and $\beta_0\geq0.05$ at $5\sigma$ confidence level with Euclid. We also demonstrate that estimating the coupled dark energy models' non-linear power spectrum, using the $\Lambda$CDM Halofit fitting formula, results in biases in the shear correlation function that exceed the survey errors.
Anti-lensing: the bright side of voids
Krzysztof Bolejko,Chris Clarkson,Roy Maartens,David Bacon,Nikolai Meures,Emma Beynon
Physics , 2012, DOI: 10.1103/PhysRevLett.110.021302
Abstract: More than half of the volume of our Universe is occupied by cosmic voids. The lensing magnification effect from those under-dense regions is generally thought to give a small dimming contribution: objects on the far side of a void are supposed to be observed as slightly smaller than if the void were not there, which together with conservation of surface brightness implies net reduction in photons received. This is predicted by the usual weak lensing integral of the density contrast along the line of sight. We show that this standard effect is swamped at low redshifts by a relativistic Doppler term that is typically neglected. Contrary to the usual expectation, objects on the far side of a void are brighter than they would be otherwise. Thus the local dynamics of matter in and near the void is crucial and is only captured by the full relativistic lensing convergence. There are also significant nonlinear corrections to the relativistic linear theory, which we show actually under-predicts the effect. We use exact solutions to estimate that these can be more than 20% for deep voids. This remains an important source of systematic errors for weak lensing density reconstruction in galaxy surveys and for supernovae observations, and may be the cause of the reported extra scatter of field supernovae located on the edge of voids compared to those in clusters.
Protesto ambiental e mudan?a social no Reino Unido
Beynon, Huw;
Mana , 1999, DOI: 10.1590/S0104-93131999000100001
Abstract: for decades, studies of protest and conflict have been dominated by research into workplaces and union activities. in 1980s and 1990s britain, the decline of the old industrial sectors combined with increasing economic insecurity and government legislation to create a weakening of workers' organizations. the 1984-85 miners' strike was seen as the last of the unions' great struggles. however, new forms of public demonstration appeared addressing environmental issues; these became identified as legitimate forms of protest and ended up influencing government policies, in particular those relating to the growing exploitation of open-seam coal mining. the last two decades have thus witnessed the mobilization of a `new class' of people who form the backbone of the new social movements and who bring specific questions such as peace and the environment to the forefront of political life.
Protesto ambiental e mudan a social no Reino Unido
Beynon Huw
Mana , 1999,
Abstract: Os estudos sobre protesto e conflito no Reino Unido s o dominados há décadas pelas pesquisas sobre o local de trabalho e as atividades sindicais. Nos anos 80 e 90, o declínio dos antigos setores industriais combinou-se com a crescente inseguran a econ mica e com a legisla o governamental, causando um enfraquecimento das organiza es de trabalhadores. A greve dos mineiros em 1984-1985 é vista como a última das grandes lutas dos sindicatos. Surgiram, contudo, novas formas de manifesta o pública, de cunho ambiental, identificadas como legítimas formas de protesto, que acabaram por influenciar políticas governamentais, em particular no que concerne à crescente explora o de minas de carv o a céu aberto. Nas duas últimas décadas viu-se, assim, a mobiliza o de uma "nova classe", que veio a formar a espinha dorsal dos novos movimentos sociais e que trouxe quest es específicas como a paz e o meio ambiente para o primeiro plano da vida política.
Enabling Proteomics: The Need for an Extendable ‘Workbench’ for User-Configurable Solutions
Robert J. Beynon
Comparative and Functional Genomics , 2004, DOI: 10.1002/cfg.372
Abstract: Proteomics has the capability to generate overwhelming quantities of data in relatively short timescales, and it is not uncommon to see experimenters investing substantially more time in data analysis than in data gathering. Although several sophisticated tools for data reduction and analysis are available, they lack the flexibility to cope with increasingly innovative experimental strategies and new database resources that encode both qualitative and quantitative data. I will outline a specification of a flexible proteomics tool that could address many current bottlenecks and deficiencies.
eBusiness Maturity and Regional Development
Beynon-Davies, P.
International Journal of Business Science and Applied Management , 2007,
Abstract: This paper describes the experience of a major research centre supporting knowledge transfer in the area of eCommerce to SMEs. It debates with issues surrounding the integration of academic research with practical support to the SME community. For this purpose the use of an eBusiness framework as a platform for eBusiness maturity assessment is proposed. These devices are seen as key to the work of research centres such as ours in addressing the future challenges for smeeBusiness.
Lifelong Learning, Empirical Modelling and the Promises of Constructivism
Meurig Beynon,Antony Harfield
Journal of Computers , 2007, DOI: 10.4304/jcp.2.3.43-55
Abstract: Educational technology is seen as key for lifelong learning, but it has yet to live up to expectation. We argue that current learning environments are typically oriented too much towards structured learning to meet the needs of the lifelong learner. Environments for lifelong learning demand a higher degree of autonomy for the learner, must be open to eclectic sources, support soft informal learning activity, and accommodate evolution both in the experience of the learner and in the context in which this occurs. We propose sense-making through the construction of suitable interactive artefacts as a core activity for lifelong learning, and discuss and illustrate how this can be supported using Empirical Modelling. The merits of Empirical Modelling as a constructivist approach are assessed with reference to a criterion recently proposed by Bruno Latour, namely, the extent to which it strengthens five guarantees, taken together.
Ethics without Morality, Morality without Ethics—Politics, Identity, Responsibility in Our Contemporary World  [PDF]
Emma Palese
Open Journal of Philosophy (OJPP) , 2013, DOI: 10.4236/ojpp.2013.33055
Abstract: Ethics without morality and morality without ethics are the characteristics of two distinct eras: modernity and post-modernity. The duty to obey the law is an ethical act, but not always moral. Morality in fact is something more: a principle of responsibility and an index of humanity. This paper aims to explain the historical relationship between morality, ethics and politics up to the present day. The erosion of the nation-state, global capitalism, bio-economy leads us to rethink the meaning of ethics, morality and politics. A utilitarian ethics and a necessary morality may be the new frontiers of our contemporary world.
Effectiveness of Musculoskeletal Emergency Physiotherapy Practitioners  [PDF]
Emma Salt
Open Journal of Therapy and Rehabilitation (OJTR) , 2016, DOI: 10.4236/ojtr.2016.43013
Abstract: Relevance and Method: The purpose of this project was to evaluate the effectiveness of the Emergency Physiotherapy Practitioner (EPP) service against quality care indicators identified as part of the “gold standard” for emergency care in England. The study was prospective and evaluated time to initial assessment, total time in the emergency department and un-planned re-attendance rate within a seven-day period for all patients seen by the EPP’s over a period of one year. Outcomes: One thousand and seven patients were seen by EPPs in the emergency department. The median wait time for treatment by an EPP was 34.5 minutes (95th percentile = 122). Regional median wait time was 45 minutes (95th percentile = 138). National median wait time was 55 minutes (95th percentile = 192). Median total time spent in ED for patients seen by EPPs was 99 minutes (95th percentile = 224). Regional median total time in ED was 223 (95th percentile = 239). Nationally median total time in ED was 136 minutes (95th percentile = 336). Three percent of patients seen by an EPP returned to the ED, compared to 6% regionally and 7.5% nationally. Conclusions: EPPs excelled in all three indicators and exceeded regional and national figures. The re-return rate met the current standard of being less than 5%. It could be justified that the addition of the EPPs to the emergency department was an efficient and effective service development.
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