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This paper seeks to develop the evidence base for urban, neighbourhood and housing policies, that aim to increase neighbourhood satisfaction and reduce residential instability. Using the longitudinal Scottish House Condition Survey 1991-96, the paper examines whether residential perceptions are generally significant predictors of individual house moving intentions and behaviours, taking into account factors related to life cycle stage, employment, tenure and type of neighbourhood. The effect of specific residential perceptions on overall satisfaction with the home and neighbourhood is traced through moving intentions to actual moves over the 1991-96 period. Using a sample of matching respondents surveyed twice in 1991 and 1996, the paper also examines whether changed residential perceptions affect moving intentions. There is evidence that deteriorating neighbourhood perceptions increase the likelihood that an individual would consider a house move, while greater satisfaction with the home is associated with reduced moving intentions.  相似文献   
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The availability of environmental and Earth resources data acquired by satellites can assist all countries to gain a better understanding of how to safeguard their environment as well as ensure a more efficient management and productive harnessing of their natural resources, However, in order for the developing countries to share in the benefits inherent in remote sensing technology and in programmes related to environmental information systems, particularly through their participation in international, regional and national programmes and projects, there must be an adequate and long-term commitment to and an investment in the development of skills and knowledge in the discipline at the local level. This article focuses on the United Nations initiative to establish regional Centres for Space Science and Technology Education which should provide a unique opportunity for the development of such an indigenous capability. These Centres have the potential to contribute significantly to the implementation of the recommendations of the Rio Conference, otherwise known as Agenda 21 and to the successful execution of the programme of activities of the user communities in the developing countries.  相似文献   
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