Perspectives on the purposes, processes and products of doctorates: towards a rich picture of doctorates

The last decade has witnessed major changes in British doctoral education. The emergence of professional and practice-based doctorates in particular, are beginning to prompt broad questions concerning the purposes, processes and products of graduate study. A growing diversity of doctoral provision is coupled with a disparate student population. For doctorates to evolve in a responsive manner, the complexity of provision and need must be understood. This work provides new insights into these changes by specifically focusing on the perspectives of students and graduates; something relatively unexplored. The perceptions and experiences of 217 students and graduates from different types of doctorates at 4 institutions were examined through postal questionnaires and follow-up semi-structured interviews. Interviews were also conducted with 8 supervisors from each institution and 9 employers, to provide a snapshot of understanding in relation to students' views. Results suggest that motivation varies with age. Younger students were more driven by the prospect of career enhancement and the development of research techniques, whereas older students gave more credence to personal development. Noticeable agreement was found over those resources that were regarded as both important and unimportant and all students considered both independence and collaboration important ways of working during a doctorate. Students' concepts of a doctorate and their understanding of doctoral capability did not seem to recognise the complexity and transferability of skills. The views of supervisors and employers varied in important respects from those of the students. These findings are discussed and their political, institutional and methodological implications are explored. It is recommended that further work concentrates on exploring the perspectives of employers to continue enriching the understanding of doctoral education

Head-on infall of two compact objects: Third post-Newtonian Energy Flux

Head-on infall of two compact objects with arbitrary mass ratio is investigated using the multipolar post-Minkowskian approximation method. At the third post-Newtonian order the energy flux, in addition to the instantaneous contributions, also includes hereditary contributions consisting of the gravitational-wave tails, tails-of-tails and the tail-squared terms. The results are given both for infall from infinity and also for infall from a finite distance. These analytical expressions should be useful for the comparison with the high accuracy numerical relativity results within the limit in which post-Newtonian approximations are valid.Comment: 25 pages, 2 figures, This version includes the changes appearing in the Erratum published in Phys. Rev.

Parton Distributions

I discuss our current understanding of parton distributions. I begin with the underlying theoretical framework, and the way in which different data sets constrain different partons, highlighting recent developments. The methods of examining the uncertainties on the distributions and those physical quantities dependent on them is analysed. Finally I look at the evidence that additional theoretical corrections beyond NLO perturbative QCD may be necessary, what type of corrections are indicated and the impact these may have on the uncertainties.Comment: Invited talk at "XXI International Symposium on Lepton and Photon Interactions at High Energies," (Fermilab, Chicago, August 2003). 12 pages, 21 figure

Empowering Children to Learn: An Exploratory Study Using a Philosophical Listening Tool (the Little Box of Big Questions 2)

A key function of educational psychologists is to promote empowering and cultivating learning environments that prepare children and young people for the twenty-first century. This study explores how children may be empowered to learn through the clarification of their daily lived experiences. Learning experiences are examined from the perspective of the children themselves, with a particular emphasis on metaphysical concepts. A listening tool was used to gather data: in-depth stories, experiences, motivations and beliefs about individual learning. Thematic analysis was applied to interviews, further promoting the ‘voice of the child’ and illuminating how children think about their own learning. Autonomy, experience and purpose are examined in the context of how children learn. This research aims to contribute towards the growing body of knowledge about how children learn. The findings may help to inform the work of educational psychologists and enhance the educational experiences of children and young people

Inclusion of new LHC data in MMHT PDFs

I consider the effects of including a variety of new LHC data sets into the MMHT approach for PDF determination. I consider the impact of fitting new LHC and Tevatron data, which leads to clear improvements in some PDF uncertainties. There are specific issues with ATLAS 7 TeV jet data and I include a discussion of the treatment of correlated uncertainties and briefly the effects of NNLO corrections. I also present preliminary results with the inclusion of the high precison final ATLAS 7 TeV $W,Z$ rapidity-dependent data.Comment: 6 pages. To appear in proceedings of DIS2017 Worksho

Violation of the Holographic Viscosity Bound in a Strongly Coupled Anisotropic Plasma

We study the conductivity and shear viscosity tensors of a strongly coupled N=4 super-Yang-Mills plasma which is kept anisotropic by a theta parameter that depends linearly on one of the spatial dimensions. Its holographic dual is given by an anisotropic axion-dilaton-gravity background and has recently been proposed by Mateos and Trancanelli as a model for the pre-equilibrium stage of quark-gluon plasma in heavy-ion collisions. By applying the membrane paradigm which we also check by numerical evaluation of Kubo formula and lowest lying quasinormal modes, we find that the shear viscosity purely transverse to the direction of anisotropy saturates the holographic viscosity bound, whereas longitudinal shear viscosities are smaller, providing the first such example not involving higher-derivative theories of gravity and, more importantly, with fully known gauge-gravity correspondence.Comment: 4 pages, 2 figures; v3: references added, version to appear in Phys. Rev. Let

Prospects for direct detection of circular polarization of gravitational-wave background

We discussed prospects for directly detecting circular polarization signal of gravitational wave background. We found it is generally difficult to probe the monopole mode of the signal due to broad directivity of gravitational wave detectors. But the dipole (l=1) and octupole (l=3) modes of the signal can be measured in a simple manner by combining outputs of two unaligned detectors, and we can dig them deeply under confusion and detector noises. Around f~0.1mHz LISA will provide ideal data streams to detect these anisotropic components whose magnitudes are as small as ~1 percent of the detector noise level in terms of the non-dimensional energy density \Omega_{GW}(f).Comment: 5 pages, 1 figure, PRL in pres

Deconstructing double-barred galaxies in 2D and 3D. II. Two distinct groups of inner bars

The intrinsic photometric properties of inner and outer stellar bars within 17 double-barred galaxies are thoroughly studied through a photometric analysis consisting of: i) two-dimensional multi-component photometric decompositions, and ii) three-dimensional statistical deprojections for measuring the thickening of bars, thus retrieving their 3D shape. The results are compared with previous measurements obtained with the widely used analysis of integrated light. Large-scale bars in single- and double-barred systems show similar sizes, and inner bars may be longer than outer bars in different galaxies. We find two distinct groups of inner bars attending to their in-plane length and ellipticity, resulting in a bimodal behaviour for the inner/outer bar length ratio. Such bimodality is related neither to the properties of the host galaxy nor the dominant bulge, and it does not show a counterpart in the dimension off the disc plane. The group of long inner bars lays at the lower end of the outer bar length vs. ellipticity correlation, whereas the short inner bars are out of that relation. We suggest that this behaviour could be due to either a different nature of the inner discs from which the inner bars are dynamically formed, or a different assembly stage for the inner bars. This last possibility would imply that the dynamical assembly of inner bars is a slow process taking several Gyr to happen. We have also explored whether all large-scale bars are prone to develop an inner bar at some stage of their lives, possibility we cannot fully confirm or discard.Comment: 14 pages, 8 figures, 1 table. Accepted for publication in MNRA

Hollowgraphy Driven Holography: Black Hole with Vanishing Volume Interior

Hawking-Bekenstein entropy formula seems to tell us that no quantum degrees of freedom can reside in the interior of a black hole. We suggest that this is a consequence of the fact that the volume of any interior sphere of finite surface area simply vanishes. Obviously, this is not the case in general relativity. However, we show that such a phenomenon does occur in various gravitational theories which admit a spontaneously induced general relativity. In such theories, due to a phase transition (one parameter family degenerates) which takes place precisely at the would have been horizon, the recovered exterior Schwarzschild solution connects, by means of a self-similar transition profile, with a novel 'hollow' interior exhibiting a vanishing spatial volume and a locally varying Newton constant. This constitutes the so-called 'hollowgraphy' driven holography.Comment: Honorable Mention Essay - Gravity Research Foundation (2010

Artifacts and cultures-of-use in intercultural communication

This article develops a conceptual framework for understanding how intercultural communication, mediated by cultural artifacts (i.e., Internet communication tools), creates compelling, problematic, and surprising conditions for additional language learning. Three case studies of computer-mediated intercultural engagement draw together correlations between discursive orientation, communicative modality, communicative activity, and emergent interpersonal dynamics. These factors contribute to varying qualities and quantities of participation in the intercultural partnerships. Case one, Clashing Frames of Expectation -- Differing Cultures-of-Use, suggests that the cultures-of-use of Internet communication tools, their perceived existence and on-going construction as distinctive cultural artifacts, differs interculturally just as communicative genre, pragmatics, and institutional context would be expected to differ interculturally. Case two, Intercultural Communication as Hyperpersonal Engagement, illustrates pragmatic and linguistic development as an outcome of intercultural relationship building. The final case study, The Wrong Tool for the Right Job?, describes a recent generational shift in communication tool preference wherein an ostensibly ubiquitous tool, e-mail, is shown to be unsuitable for mediating age peer relationships. Taken together, these case studies demonstrate that Internet communication tools are not neutral media. Rather, individual and collective experience is shown to influence the ways students engage in Internet-mediated communication with consequential outcomes for both the processes and products of language development