Extragalactic radio source evolution under the dual-population unification scheme

We show that a dual-population unification scheme provides a successful paradigm with which to describe the evolution and beaming of all bright extragalactic radio sources. The paradigm consists of two intrinsic radio-source populations, based on the two distinct radio-galaxy morphologies of Fanaroff-Riley classes I and II. These represent the `unbeamed' or `side-on' parent populations of steep radio spectra; the `beamed' source types including flat-spectrum quasars and BL Lac objects, arise through the random alignment of their radio-axis to our line-of-sight where Doppler-beaming of the relativistic radio jets produces highly anisotropic radio emission.Comment: 18 pages & 18 postscript figures, accepted for publication in MNRA

Self-assembled ErAs islands in GaAs for optical-heterodyne THz generation

We report photomixer devices fabricated on a material consisting of self-assembled ErAs islands in GaAs, which is grown by molecular beam epitaxy. The devices perform comparably and provide an alternative to those made from low-temperature-grown GaAs. The photomixer's frequency response demonstrates that the material is a photoconductor with subpicosecond response time, in agreement with time-resolved differential reflectance measurements. The material also provides the other needed properties such as high photocarrier mobility and high breakdown field, which exceeds 2×10^5 V/cm. The maximum output power before device failure at frequencies of 1 THz was of order 0.1 µW. This material has the potential to allow engineering of key photomixer properties such as the response time and dark resistance

A scoping review of staff training and education needs

The aim of this report is to review international literature to identify best practice, gaps and challenges in existing dementia training, education and continuing professional development (CPD) and make recommendations to cross border partners to complement the work that PP7 and PP9 are undertaking in Work Package 1 and 2. The scoping review identified and synthesised literature to address the question ‘what knowledge and skills do practitioners involved in caring for people living with dementia (PLWD) need to support person centred practice’? Thirty two papers were included in the review, 19 of which were training or education interventions aimed at developing healthcare staff’s skills and knowledge for improved dementia care practices. The focus was mainly on person centred dementia care, managing challenging behaviour and improving communication with people living with dementia. The findings highlight three main themes relating to the learning and development needs of staff that care for people living with dementia, which include person centred care, communication and managing dementia care. Evidence based training and education programmes for developing a skilled workforce in dementia care are still in development. The literatures cites a lack of rigour in the assessment of the effectiveness of existing programmes. However, the review provides some insight into the broad themes emerging in the literature and the methodological challenges associated with drawing any meaningful conclusions about best practice models currently for education and training. As a starting point it offers the CASCADE team potential to provide a bol

Surface treatments for nickel and nickel-base alloys

Surface treatments of nickel and nickel alloys by diffusion coating, electroplating, explosive hardening, peening, and other method

The spectral characteristics of the 2dFGRS-NVSS galaxies

We have analysed the 2dF spectra of a sample of galaxies common to the 2dF galaxy redshift survey (2dFGRS, Colless 1999) and the NRAO VLA sky survey (NVSS, Condon et al. 1998). Our sample comprises 88 galaxies selected by Sadler et al. (1999) from 30 2dFGRS fields observed in 1998. In this paper we discuss how this and future, much larger, samples of 2dFGRS-NVSS galaxies can be interpreted via analysis of those galaxies with strong narrow emission lines. Using diagnostic line ratio measurements we confirm the majority of the eyeball classifications of Sadler et al. (1999), although many galaxies show evidence of being `composite' galaxies - a mixture of AGN plus starburst components.Comment: 11 pages, 5 figures, accepted for publication in PAS

Equivalence of two mathematical forms for the bound angular momentum of the electromagnetic field

It is shown that the mathematical form, obtained in a recent paper, for the angular momentum of the electromagnetic field in the vicinity of electric charge is equivalent to another form obtained previously by Cohen-Tannoudji, Dupont-Roc and Gilbert. In this version of the paper an improved derivation is given.Comment: 4 pages pdf, simpler derivatio