From the “broadband ditch” to the release of the 2010 US national broadband plan. A short history of the broadband penetration debate in the US

The paper provides an historical account of the policy debate that took place in the United States after the 2007 release of the OECD's broadband statistics. It explains why and in what context such a debate occurred (lack of relevant statistics from the FCC, dissatisfaction of some stakeholders with the deregulation of broadband, role of new players). The paper reviews the policy options proposed by the main players to foster the deployment of broadband, among others the potential inclusion of broadband in the scope of the US universal service, the need for a national policy, and implementation/funding issues. It puts into perspective the national broadband plan proposed by the FCC in March 2010.broadband, competition, industrial policies, government intervention, universal service, open internet, deregulation, rankings/ benchmarking countries.

The development and calibration of a generic dynamic absorption chiller model

Although absorption cooling has been available for many years, the technology has typically been viewed as a poorly performing alternative to vapour compression refrigeration. Rising energy prices and the requirement to improve energy efficiency is however driving renewed interest in the technology, particularly within the context of combined cooling, heat and power systems (CCHP) for buildings. In order to understand the performance of absorption cooling, numerous models are available in the literature. However, the complexities involved in the thermodynamics of absorption chillers have so far restricted researchers to creating steady state or dynamic models reliant on data measurements of the internal chiller state, which require difficult-to-obtain, intrusive measurements. The pragmatic, yet fully-dynamic model described in this paper is designed to be easily calibrated using data obtained from the measurements of inflows and outflows to a chiller, without resorting to intrusive measurements. The model comprises a series of linked control volumes featuring both performance maps and lumped mass volumes, which reflect the underlying physical structure of the device. The model was developed for the ESP-r building simulation tool. This paper describes the modelling approach, theory and limitations, along with its calibration and the application of the model to a specific example

Exactly Solvable Lattice Models with Crossing Symmetry

We show how to compute the exact partition function for lattice statistical-mechanical models whose Boltzmann weights obey a special "crossing" symmetry. The crossing symmetry equates partition functions on different trivalent graphs, allowing a transformation to a graph where the partition function is easily computed. The simplest example is counting the number of nets without ends on the honeycomb lattice, including a weight per branching. Other examples include an Ising model on the Kagome' lattice with three-spin interactions, dimers on any graph of corner-sharing triangles, and non-crossing loops on the honeycomb lattice, where multiple loops on each edge are allowed. We give several methods for obtaining models with this crossing symmetry, one utilizing discrete groups and another anyon fusion rules. We also present results indicating that for models which deviate slightly from having crossing symmetry, a real-space decimation (renormalization-group-like) procedure restores the crossing symmetry

A commentary on recent water safety initiatives in the context of water utility risk management.

Over the last decade, suppliers of drinking water have recognised the limitations of relying solely on end-product monitoring to ensure safe water quality and have sought to reinforce their approach by adopting preventative strategies where risks are proactively identified, assessed and managed. This is leading to the development of water safety plans; structured ‘route maps’ for managing risks to water supply, from catchment to consumer taps. This paper reviews the Hazard Analysis and Critical Control Point (HACCP) procedure on which many water safety plans are based and considers its appropriateness in the context of drinking water risk management. We examine water safety plans in a broad context, looking at a variety of monitoring, optimisation and risk management initiatives that can be taken to improve drinking water safety. These are cross-compared using a simple framework that facilitates an integrated approach to water safety. Finally, we look at how risk management practices are being integrated across water companies and how this is likely to affect the future development of water safety p

Climate change and fuel poverty

The research examined the possible effects of rapid climate change on fuel poverty (needing to spend more than 10% of income to maintain a satisfactory level of warmth and other energy services in the home). One particular concern was the prospect that there might be a shutting off of the Gulf Stream, which warms Britain and the rest of north-western Europe. Computer simulations of the climate indicate that shutting down the Gulf Stream would cool England by about 3°C. Climate is not the only variable that will affect future levels of fuel poverty. The other main ones are what will happen to the energy efficiency of the building stock, to incomes and to energy prices. The aim of the project was to examine what might happen to each of these four dimensions and construct three scenarios in each dimension (most likely, high and low) to capture the range of variation in possible outcomes. A total of 81 (3x3x3x3) scenarios were modelled and analysed. Since any changes in the climate system take decadesto play out, but it is extremely difficult to predict social, economic and technological changes even 25 years in the future, it was decided to set an objective for this research of looking forward to 2030.

Designing a Highly Expressive Algorithmic Music Composition System for Non-Programmers

Algorithmic composition systems allow for the partial or total automation of music composition by formal, computational means. Typical algorithmic composition systems generate nondeterministic music, meaning that multiple musical outcomes can result from the same algorithm - consequently the output is generally different each time the algorithm runs