A Derivation of Three-Dimensional Inertial Transformations

The derivation of the transformations between inertial frames made by Mansouri and Sexl is generalised to three dimensions for an arbitrary direction of the velocity. Assuming lenght contraction and time dilation to have their relativistic values, a set of transformations kinematically equivalent to special relativity is obtained. The ``clock hypothesis'' allows the derivation to be extended to accelerated systems. A theory of inertial transformations maintaining an absolute simultaneity is shown to be the only one logically consistent with accelerated movements. Algebraic properties of these transformations are discussed. Keywords: special relativity, synchronization, one-way velocity of light, ether, clock hypothesis.Comment: 16 pages (A5), Latex, one figure, to be published in Found. Phys. Lett. (1997

Visually Impaired OLder people's Exercise programme for falls prevenTion (VIOLET): a feasibility study

This study aims to conduct a mixed methods feasibility study to inform the design and conduct of a future definitive RCT of an adapted exercise programme to prevent falls by reducing fear of falling among older people with visual impairment (OPVI). The research questions are: can an existing exercise programme be adapted for OPVI and successfully delivered in the community; is it feasible to conduct an RCT of this intervention and what are the features of a future definitive trial? We propose to: (i) Adapt an existing exercise programme with the full involvement of OPVI and practitioners; (ii) Run a feasibility study in 2 sites to test our proposed measures, trial processes and recruitment; explore acceptability of the intervention; fidelity of and compliance with the intervention. Two stakeholder panels will be established including OPVI aged 60 and over from Newcastle Society for Blind People (NSBP) and Visibility in Glasgow, practitioners and researchers. They will work together to adapt the FaME programme, which is known to be effective in reducing falls in frequent fallers, so that the methods are acceptable for OPVI, whilst retaining the effective components of the exercise. The panels will meet 4 times to adapt the intervention and contribute to decisions on outcome measures and data collection. During this time we will identify OPVI wishing to act as expert stakeholders in the subsequent WPs. OPVI aged 60+ will be recruited from low vision clinics and voluntary organisations and randomised into the intervention or comparator arm. Those in the comparator arm will receive no intervention, but will be offered it after final data collection. The core components of the adapted exercise programme aim to strengthen leg muscles and retrain balance. However, the detail of the methods and timing will be decided by the stakeholder panel. The programme is likely to run once a week over 12 weeks, with each session lasting up to one hour. The final form of delivery will be one of the outcomes of the PPI work in WP1. Participants will be provided with instructions and equipment to do the exercises at home if they wish. The intervention will be delivered by exercise instructors engaged by Health Works, Newcastle and Visibility, Glasgow, in venues agreed with participants. The final primary outcome of the future RCT will be decided by the responsiveness to change, participant burden and participant feedback from this study. The likely candidate primary outcome is fear of falling (Short FES-I scale). The main secondary outcomes will be: activity avoidance; balance/falls risk; number of falls; quality of life; loneliness; depression; adherence to exercise programme; self-reported home exercising. An estimate of cost effectiveness and cost utility of the intervention will be undertaken. In-depth interviews with a sample of OPVI will be conducted to explore their reasons for taking part/not taking part; factors that facilitate/hinder them from participating in exercise groups; their experiences of the recruitment and randomisation process and views on the outcome measures; their experience of the adapted intervention. The interviews will highlight site specific issues to consider for the definitive RCT. Structured interviews will be undertaken with commissioners and practitioners to explore their perspectives on the application of the intervention

Crystallization of the ordered vortex phase in high temperature superconductors

The Landau-Khalatnikov time-dependent equation is applied to describe the crystallization process of the ordered vortex lattice in high temperature superconductors after a sudden application of a magnetic field. Dynamic coexistence of a stable ordered phase and an unstable disordered phase, with a sharp interface between them, is demonstrated. The transformation to the equilibrium ordered state proceeds by movement of this interface from the sample center toward its edge. The theoretical analysis dictates specific conditions for the creation of a propagating interface, and provides the time scale for this process.Comment: 8 pages and 3 figures; to be published in Phys. Rev. B (Rapid Communications section

Spin-gravity coupling and gravity-induced quantum phases

External gravitational fields induce phase factors in the wave functions of particles. The phases are exact to first order in the background gravitational field, are manifestly covariant and gauge invariant and provide a useful tool for the study of spin-gravity coupling and of the optics of particles in gravitational or inertial fields. We discuss the role that spin-gravity coupling plays in particular problems.Comment: 18 pages, 1 figur

Psychosocial, socio-cultural, and environmental influences on mental health help-seeking among African-American men

http://dx.doi.org/10.1016/j.jomh.2012.03.00

Two-proton correlations from 158 AGeV Pb+Pb central collisions

The two-proton correlation function at midrapidity from Pb+Pb central collisions at 158 AGeV has been measured by the NA49 experiment. The results are compared to model predictions from static thermal Gaussian proton source distributions and transport models RQMD and VENUS. An effective proton source size is determined by minimizing CHI-square/ndf between the correlation functions of the data and those calculated for the Gaussian sources, yielding 3.85 +-0.15(stat.) +0.60-0.25(syst.) fm. Both the RQMD and the VENUS model are consistent with the data within the error in the correlation peak region.Comment: RevTeX style, 6 pages, 4 figures, 1 table. More discussion are added about the structure on the tail of the correlation function. The systematic error is revised. To appear in Phys. Lett.

Event-by-event fluctuations of average transverse momentum in central Pb+Pb collisions at 158 GeV per nucleon

We present first data on event-by-event fluctuations in the average transverse momentum of charged particles produced in Pb+Pb collisions at the CERN SPS. This measurement provides previously unavailable information allowing sensitive tests of microscopic and thermodynamic collision models and to search for fluctuations expected to occur in the vicinity of the predicted QCD phase transition. We find that the observed variance of the event-by-event average transverse momentum is consistent with independent particle production modified by the known two-particle correlations due to quantum statistics and final state interactions and folded with the resolution of the NA49 apparatus. For two specific models of non-statistical fluctuations in transverse momentum limits are derived in terms of fluctuation amplitude. We show that a significant part of the parameter space for a model of isospin fluctuations predicted as a consequence of chiral symmetry restoration in a non-equilibrium scenario is excluded by our measurement.Comment: 6 pages, 2 figures, submitted to Phys. Lett.

Coupled free-carrier and exciton relaxation in optically excited semiconductors

The energy relaxation of coupled free-carrier and exciton populations in semiconductors after low-density ultrafast optical excitation is studied through a kinetic approach. The set of semiclassical Boltzmann equations, usually written for electron and hole populations only, is complemented by an additional equation for the exciton distribution. The equations are coupled by reaction terms describing phonon-mediated exciton binding and dissociation. All the other relevant scattering mechanisms, such as carrier-carrier, carrier-phonon, and exciton-phonon interactions, are also included. The resulting system of rate equations in reciprocal space is solved by an extended ensemble Monte Carlo method. As a first application, we show results for the dynamics of bulk GaAs in the range from 1 to ∼200 ps after photoexcitation. The build-up of an exciton population and its sensitivity to the excitation conditions are discussed in detail. As a consequence of the pronounced energy dependence of the LO-phonon-assisted transition probabilities between free-pair states and excitons, it is found that the efficiency of the exciton-formation process and the temporal evolution of the resulting population are sensitive to the excitation energy. We discuss the effects on luminescence experiments

A deep learning system accurately classifies primary and metastatic cancers using passenger mutation patterns.

In cancer, the primary tumour's organ of origin and histopathology are the strongest determinants of its clinical behaviour, but in 3% of cases a patient presents with a metastatic tumour and no obvious primary. Here, as part of the ICGC/TCGA Pan-Cancer Analysis of Whole Genomes (PCAWG) Consortium, we train a deep learning classifier to predict cancer type based on patterns of somatic passenger mutations detected in whole genome sequencing (WGS) of 2606 tumours representing 24 common cancer types produced by the PCAWG Consortium. Our classifier achieves an accuracy of 91% on held-out tumor samples and 88% and 83% respectively on independent primary and metastatic samples, roughly double the accuracy of trained pathologists when presented with a metastatic tumour without knowledge of the primary. Surprisingly, adding information on driver mutations reduced accuracy. Our results have clinical applicability, underscore how patterns of somatic passenger mutations encode the state of the cell of origin, and can inform future strategies to detect the source of circulating tumour DNA