Iona in the Kingdom of the Picts: a note

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Environmental Impacts of Diverting Crop Residues to Fuel Use

Shortage of fuel wood has lead many rural people to switch to using agricultural residues as an alternative energy source. However this has not always been met with universal acclaim due to the role of residues as fertilisers. Although crop residues and animal manure as a nutrient source has been superseded by inorganic fertilizers in most intensive farming systems, they\ud continue to be the main source of crop nutrient replacement in most developing countries. There has developed wide spread assumption that the removal of all crop residues from the fields must therefore be prevented since this will be detrimental to crop productivity. This is a gross simplification on several fronts

Small-scale energy systems on a large-scale in developing countries

This paper reviews the barriers to large-scale use of small-scale energy systems. It places the review in the context of the size of the challenge both in terms of the numbers of people who still need access to modern energy carriers and in the levels of finance to provide this access. It concludes that the main problems related to access are not technical but are motivational, financial and institutions. The paper provides examples from around the world as to how these issues have been addresse

Gender as a factor in delivering sustainable energy

This paper reviews the role of energy in contributing to the solution of a major development objective: moving people out of poverty. Understanding gender issues, especially the crucial role women play in household energy provision, is important in the design and implementation of appropriate energy interventions. The role energy plays in improving women’s lives and the role women can play in providing energy services is reviewed. Some indictors of success factors for sustainable energy interventions are identified based on recent field experience

Persistence time of SIS infections in heterogeneous populations and networks

For a susceptible-infectious-susceptible (SIS) infection model in a heterogeneous population, we present simple formulae giving the leading-order asymptotic (large population) behaviour of the mean persistence time, from an endemic state to extinction of infection. Our model may be interpreted as describing an infection spreading through either (i) a population with heterogeneity in individuals' susceptibility and/or infectiousness; or (ii) a heterogeneous directed network. Using our asymptotic formulae, we show that such heterogeneity can only reduce (to leading order) the mean persistence time compared to a corresponding homogeneous population, and that the greater the degree of heterogeneity, the more quickly infection will die out

Household energy isn't all stoves

When people talk about 'household energy', most people automatically think of stoves. A lot of attention has been paid to improving stoves to make them more energy efficient and to reduce their pollution. This is one side of the 'stoves' approach, whilst others look at the 'supply' side of the problem by, for example, setting up woodlots. However, without wanting to take away from the very important work of trying to find solutions to meet this basic need, one should be asking 'Is this all there is to household energy? Once every household has an improved stove, will their energy problems be solved?' The answer is 'No'. This is because the energy needs of a household are more than what is needed to heat the cooking pot. There is the need for lighting, and in some places for heating. People are becoming more aware of the possibilities of electricity, for example, radios and sewing machines. Their needs are becoming more complex. This requires a change in approach about the way we consider household energy. We have to think more in terms of energy services to the household. Then we have to look beyond the walls of the household and see what goes on outside and how it relates the household and its energy needs

Dana Clancy: Intimate Distance

This is the catalogue of the exhibition "Dana Clancy" at Boston University Art Gallery

Linear force device

The object of the invention is to provide a mechanical force actuator which is lightweight and manipulatable and utilizes linear motion for push or pull forces while maintaining a constant overall length. The mechanical force producing mechanism comprises a linear actuator mechanism and a linear motion shaft mounted parallel to one another. The linear motion shaft is connected to a stationary or fixed housing and to a movable housing where the movable housing is mechanically actuated through actuator mechanism by either manual means or motor means. The housings are adapted to releasably receive a variety of jaw or pulling elements adapted for clamping or prying action. The stationary housing is adapted to be pivotally mounted to permit an angular position of the housing to allow the tool to adapt to skewed interfaces. The actuator mechanisms is operated by a gear train to obtain linear motion of the actuator mechanism

The computation of wave lengths of molecular hydrogen between 5415 and 5810.

Thesis (M.A.)--Boston University N.B.:Pages missing : 3, 15. Only one copy was available.This thesis presents the results of calculations undertaken to obtain the wavelengths of certain lines in the molecular spectrum of hydrogen. These lines lie in the range 5145 A to 5810 A. The spectrogram on which the lines are recorded was taken by Dr. Reginald G. Lacount, who exposed the plate in a Littrow-mount spectrograph at Boston University, using a hydrogen discharge tube as a source. [Truncated