A study of shock impacts and vibration dose values onboard highspeed marine craft

The shocks and impacts encountered on small high-speed craft exceed the limits set for safe working practice according to current standards. European legislation regarding the exposure to vibration will have far reaching effects on the operators of such craft with respect to the safety of their employees. This paper sets out to highlight the vibration dose values that can be expected during typical transits onboard high-speed craft and attempts to clarify some of the controversy currently surrounding vibration dose measurement in such circumstances. In order to relate vibration dosage to the impacts encountered and to boat motion, an algorithm was developed that identifies the timing and magnitude of impacts

Fade depth scaling with channel bandwidth

The dependence of small-scale fading on bandwidth is quantified experimentally in the 3.1–10.6 GHz band for indoor channels. The fade depth converges to 4 dB at 1 GHz bandwidth, with little reduction for further increase in bandwidth. A simple yet accurate empirical fade depth model is developed, enabling convenient evaluation of the link budget for a channel with given bandwidth

Images of industrial work and the prospects for personal advancement among African factory workers in Durban

A sample of African industrial workers in Durban, including migrant workers, were studied in depth to determine their views of work in white-controlled industrial - technological settings... Inter alia it was established that the enthusiasm with which different forms of industrial work are regarded varies considerably among the men studied

Groundwater– surface water interaction investigations at the Boxford Research site in 2009/10

The site was originally set up as a research facility as part of the Natural Environment Research Council’s Lowland Catchment Research (LOCAR) Thematic Programme (Wheater and Peach, 2004). This was created to improve the science required to support current and future management needs for permeable lowland catchments through an integrated and multi-disciplinary experimental and modelling programme. As part of the LOCAR work an infrastructure of long-term facilities was established in three catchments, the Pang-Lambourn, Frome-Piddle and Tern (Adams et al., 2004). The Boxford Research Site was one of several sites selected in the Pang-Lambourn catchment. The site is currently the main focus for the Groundwater-Surface Water (GW-SW) Interaction Project of the British Geological Survey (BGS) Groundwater Science Program. This has significantly developed upon the existing LOCAR infrastructure and resulted in multiple recent publications including: Allen et al. (2010), Lapworth et al. (2009) and Abesser et al. (2008). Since the site was established in 2002, BGS work has predominantly been centred on Westbrook Farm. Recently, however, the Centre for Ecology and Hydrology (CEH) acquired the land immediately to the south of the farm. This included approximately 500 m of additional river bank and adjacent wetlands - allowing scope for research over a greater area and more varied terrain. The CEH site is known as the Lambourn Observatory. Previous research in the observatory has focussed on the wetlands to the north (Prior and Johnes, 2002) and south (Atkins, 2005) of the Lambourn

The student in residence: an analysis of satisfaction and dissatisfaction with residence life at the University of Natal's Durban campus: brief report on two follow-up studies

This report is an attempt to set out the major findings of the evaluation studies of University of Natal residences (1977 and 1984) updating an earlier survey in 1976, and to identify those aspects of residence life which may warrant particular attention on behalf of the University planners. A report of the 1976 survey evaluation appears in: Schlemmer, L. (1977) The student in residence, Durban: CASS, University of Natal

Algorithm for numerical integration of the rigid-body equations of motion

A new algorithm for numerical integration of the rigid-body equations of motion is proposed. The algorithm uses the leapfrog scheme and the quantities involved are angular velocities and orientational variables which can be expressed in terms of either principal axes or quaternions. Due to specific features of the algorithm, orthonormality and unit norms of the orientational variables are integrals of motion, despite an approximate character of the produced trajectories. It is shown that the method presented appears to be the most efficient among all known algorithms of such a kind.Comment: 4 pages, 1 figur