40,600 research outputs found
Stability of domain walls coupled to Abelian gauge fields
Rozowsky, Volkas and Wali recently found interesting numerical solutions to
the field equations for a gauged U1xU1 scalar field model. Their solutions
describe a reflection-symmetric domain wall with scalar fields and coupled
gauge configurations that interpolate between constant magnetic fields on one
side of the wall and exponentially decaying ones on the other side. This
corresponds physically to an infinite sheet of supercurrent confined to the
domain wall with a linearly rising gauge potential on one side and Meissner
suppression on the other. While it was shown that these static solutions
satisfied the field equations, their stability was left unresolved. In this
paper, we analyse the normal modes of perturbations of the static solutions to
demonstrate their perturbative stability.Comment: 9 pages, 9 figure
Renewable Energy Resources Impact on Clean Electrical Power by developing the North-West England Hydro Resource Model.
This paper describes the development of a sequential decision support system to promote hydroelectric power in North-West England. The system, composed of integrated models, addresses barriers to the installation of hydroelectric power schemes. Information is linked through an economic assessment which identifies different turbine options, assesses their suitability for location and demand; and combines the different types of information in a way that supports decision making. The system is structured into five components: the hydrological resource is modelled using Low Flows 2000, the turbine options are identified from hydrological, environmental and demand requirements; and the consequences of different solutions will be fed into other components so that the environmental impacts and public acceptability can be assessed and valued. A preliminary case study is presented on an old gunpowder works to illustrate how the resource model may be employed. Historical architectural structures, power uptake and educational instruction of hydro power technology are considered
Cruise Crimes: Economic-Legal Issues and Current Debates
Cruise tourism is one of the sunshine sectors of international tourism and is growing rapidly in many parts of the world. It is estimated that the growth rate of cruise tourism is twice the rate of tourism overall. Notwithstanding all the positives that accompany this growth, many critics have drawn attention to the “dark side” of cruise crimes. The eco-system aboard the cruise ship offers a fertile ground for the occurrence of crimes. The present paper examines the issue of crimes onboard from multiple standpoints and suggests some remedial measures that would lead to better management of cruise crimes. A presentation of the recent initiatives by the U.S. legislative bodies aimed at containing cruise crimes is also provided.cruise ships; criminology aboard; cruise crime typology; crime prevention; industry initiative; legislative intervention; and USA
Water quality for irrigation
Although irrigation and salinity problems are frequently inseperable, there is a range of management methods that can be used to handle marginal quality water. Freuently these methods are simple, but require careful planning.
The wide range in tolerance of crops to salinity can be exploiter to ensure that appropriate crops are selected for the water available.
Because crops vary in their sensitivity to salt uptake in the leaves or the roots, watering methods can be changed to avoid problems. For profitable production enough water should be applied to ensure adequate water is available for plant growth as well as to leach excess salt out of the root zone.
Even with good quality water salt problems will occur in areas with watertables close to the surface, so effective drainage is essential for healthy growth.
Appropriate crop selection, cultural methods and water management allow saline water to be used to produce profitable crops
Coastal plains : land use and the environment
Five years ago, this Journal of Agriculture reported on ways to overcome severe algal pollution of the Peel-Harvey estuarine system, 70 km south of Perth.
Several articles in this Journal of Agriculture discuss improved agricultural practices on the Swan Coastal Plain in particular, although the principals will apply to similar eutrophication of the Slbany harbours, Wilson Inlet and the Vassee-Wonnerup Estuary. They also emphasixe the fine balance between man\u27s demand for potable water and land for rural, industrial and urban use
The dryland salinity problem in North America
North america also has a dryland salinity problem although the source is different
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