2,948 research outputs found
Housing policy: a more coherent approach
Our current housing crisis has many facets. There are too few homes for everyone, those there are can be unaffordable, and intergeneration inequalities in housing costs and wealth are more pronounced that at any other time in the postwar era. Meanwhile home ownership is falling, while the insecure private rented sector has doubled in size since the turn of the century – and now accommodates almost 20% of households
On the Change in Archivability of Websites Over Time
As web technologies evolve, web archivists work to keep up so that our
digital history is preserved. Recent advances in web technologies have
introduced client-side executed scripts that load data without a referential
identifier or that require user interaction (e.g., content loading when the
page has scrolled). These advances have made automating methods for capturing
web pages more difficult. Because of the evolving schemes of publishing web
pages along with the progressive capability of web preservation tools, the
archivability of pages on the web has varied over time. In this paper we show
that the archivability of a web page can be deduced from the type of page being
archived, which aligns with that page's accessibility in respect to dynamic
content. We show concrete examples of when these technologies were introduced
by referencing mementos of pages that have persisted through a long evolution
of available technologies. Identifying these reasons for the inability of these
web pages to be archived in the past in respect to accessibility serves as a
guide for ensuring that content that has longevity is published using good
practice methods that make it available for preservation.Comment: 12 pages, 8 figures, Theory and Practice of Digital Libraries (TPDL)
2013, Valletta, Malt
Some factors affecting the extraction of nitrogenous materials from leaves of various species
RESP-274
External and internal noise surveys of London primary schools
Internal and external noise surveys have been carried out around schools in London, UK, to provide information on typical levels and sources to which children are exposed while at school. Noise levels were measured outside 142 schools, in areas away from flightpaths into major airports. 86% of the schools surveyed were exposed to noise from road traffic, the average external noise level outside a school being 57 dB LAeq. Detailed internal noise surveys have been carried out in 140 classrooms in 16 schools, together with classroom observations. It was found that noise levels inside classrooms depend upon the activities in which the children are engaged, with a difference of 20 dB LAeq between the 'quietest' and 'noisiest' activities. The average background noise level in classrooms exceeds the level recommended in current standards. The number of children in the classroom was found to affect noise levels. External noise influenced internal noise levels only when children were engaged in the quietest classroom activities. The effects of the age of the school buildings and types of window upon internal noise were examined but results were inconclusive
Studies on the storage of potatoes. III. The composition of the atmosphere in a potato clamp
RESP-297
Electron-beam propagation in a two-dimensional electron gas
A quantum mechanical model based on a Green's function approach has been used
to calculate the transmission probability of electrons traversing a
two-dimensional electron gas injected and detected via mode-selective quantum
point contacts. Two-dimensional scattering potentials, back-scattering, and
temperature effects were included in order to compare the calculated results
with experimentally observed interference patterns. The results yield detailed
information about the distribution, size, and the energetic height of the
scattering potentials.Comment: 7 pages, 6 figure
Transmission efficiency and noise, vibration and harshness refinement of differential hypoid gear pairs
This article presents a combined multi-body dynamics and lubricated contact mechanics model of vehicular differential hypoid gear pairs, demonstrating the transient nature of transmission efficiency and noise, vibration and harshness performance under various driving conditions. The contact of differential hypoid gears is subjected to mixed thermo-elastohydrodynamic regime of lubrication. The coefficient of friction is obtained using an analytical approach for non-Newtonian lubricant shear and supplemented by boundary interactions for thin films. Additionally, road data and aerodynamic effects are used in the form of resisting torque applied to the output side of the gear pair. Sinusoidal engine torque variation is also included to represent engine order torsional input resident on the pinion gear. Analysis results are presented for New European Driving Cycle transience from low-speed city driving condition in second gear to steady-state cruising in fourth gear for a light truck. It is shown that the New European Driving Cycle captures the transmission efficiency characteristics of the differential hypoid gear pair under worst case scenario, with its underlying implications for fuel efficiency and emissions. However, it fails to address the other key attribute, being the noise, vibration and harshness performance. In the case of hypoid gears, the resultant noise, vibration and harshness characteristics can be particularly annoying. It is concluded that broader transient manoeuvres encompassing New European Driving Cycle are required for assessment, in order to obtain a balanced approach for transmission efficiency and noise, vibration and harshness performance. This approach is undertaken in this article, which is not hitherto reported in the literature
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