HAWAII LONGLINE VESSEL ECONOMICS

Public Economics,

Bandwidth in bolometric interferometry

Bolometric Interferometry is a technology currently under development that will be first dedicated to the detection of B-mode polarization fluctuations in the Cosmic Microwave Background. A bolometric interferometer will have to take advantage of the wide spectral detection band of its bolometers in order to be competitive with imaging experiments. A crucial concern is that interferometers are presumed to be importantly affected by a spoiling effect known as bandwidth smearing. In this paper, we investigate how the bandwidth modifies the work principle of a bolometric interferometer and how it affects its sensitivity to the CMB angular power spectra. We obtain analytical expressions for the broadband visibilities measured by broadband heterodyne and bolometric interferometers. We investigate how the visibilities must be reconstructed in a broadband bolometric interferometer and show that this critically depends on hardware properties of the modulation phase shifters. Using an angular power spectrum estimator accounting for the bandwidth, we finally calculate the sensitivity of a broadband bolometric interferometer. A numerical simulation has been performed and confirms the analytical results. We conclude (i) that broadband bolometric interferometers allow broadband visibilities to be reconstructed whatever the kind of phase shifters used and (ii) that for dedicated B-mode bolometric interferometers, the sensitivity loss due to bandwidth smearing is quite acceptable, even for wideband instruments (a factor 2 loss for a typical 20% bandwidth experiment).Comment: 13 pages, 14 figures, submitted to A&

Nonlinear Torsional Wave Beams

An evolution equation with cubic nonlinearity is presented for a torsional wave beam in an isotropic elastic solid. Analytical solutions are presented for the fundamental and third harmonic in the far field of a uniform circular source. Numerical results are presented for harmonic beam patterns at an intermediate distance between the near and far fields, and for a torsional waveform with shocks.Applied Research Laboratorie

A study into the effectiveness of an education programme for parents and teachers

Introduction: Parents and teachers lack knowledge and self-efficacy when providing postural care to physically disabled children. This can act as a barrier to the successful implementation of therapy. An intervention was developed to improve knowledge and confidence in providing postural care. The aim is to determine whether this intervention improves parents’ and teachers’ knowledge and confidence. Participants and Methods: The intervention includes a 2-hour interactive workshop and follow-up home/school visits delivered in three localities across the south-east of England. The UKC-PostCarD scale, which assesses levels of knowledge and confidence in providing postural care, was used to evaluate the intervention. It is completed at baseline and after the intervention is completed. Focus groups with participants will provide insight into elements that were effective/ineffective.Interviews with children will provide their perspective. Interviews with therapists will consider the feasibility and acceptability of delivery. Results: A mixed-design ANOVA 2 (Time: before vs. after) 9 3 (Area:Kent, Sussex, Surrey) will be used to determine whether knowledge and confidence improved following the intervention. Framework analysis will be used for the focus group and interview data. Qualitative findings will be fed into the overall evaluation. Results will be available by September 2013. Conclusion: If shown to improve confidence and knowledge, we will make this education programme available nationally

A new method to search for a cosmic ray dipole anisotropy

We propose a new method to determine the dipole (and quadrupole) component of a distribution of cosmic ray arrival directions, which can be applied when there is partial sky coverage and/or inhomogeneous exposure. In its simplest version it requires that the exposure only depends on the declination, but it can be easily extended to the case of a small amplitude modulation in right ascension. The method essentially combines a $\chi^2$ minimization of the distribution in declination to obtain the multipolar components along the North-South axis and a harmonic Rayleigh analysis for the components involving the right ascension direction