An Examination of the Interaction Between Modelling and Its Relationship with Construction Kits: Lessons from the Past and for the Future

Construction kits have played a significant part in nurturing the growth and development of the minds and manipulation-based skills of children (and adults) in formal and non-formal education settings. These kits have origins rooted in the representation of the built world and now have a diversity of form and function, including technical versions with moving parts. This article examines some of the historically based ideas that lie behind the role that kits may have in terms of physical modelling. The article traces the transformation of kits from simple bricks and blocks into more complicated pieces for space-filling and achieving the transfer of forces and motion. This transformation occurred during the Victorian era when the influence of the ideas of educationalists and, perhaps rather strangely, exponents of early aviation, played major roles in determining the diversity of forms of construction kit and modelled possibilities that are now to be seen in classrooms and homes. The article ends with a review of some of the lessons from the past and present that will need to be considered in relation to concrete modelling in schools for the future. This revised version was published online in July 2006 with corrections to the Cover Date.     

中国现阶段的工业品市场营销模式初探

随着中国市场经济的快速发展、科技水平的提高以及中国加入WTO,工业品的市场竞争将更加激烈。对于中国现阶段的工业品来讲,由于行业、企业、产品特点及销售对象不同,各公司的营销策略各有不同,尤其对市场营销模式需要进一步探索。     

The Impact of the Implementation of Technology Education on In-Service Teacher Education in South Africa (Impact of Technology Education in the RSA)

In this article the impact of technology education, as a new learning area (subject) in the curriculum, on in-service teacher education in South Africa is described in order to ascertain the extent of the impact. The research on which this article is based draws on a variety of experiences and observations in the field at grassroots level (in particular an outreach project in rural communities). The envisaged impact of technology education on South African schools, communities, teacher educators and teachers, the range of in-service teacher education that is required, and the impacts in urban and rural areas are discussed. Finally a number of concluding remarks are made about the extent of the impact of the inclusion of technology education in the new National Curriculum Statement and whether the situation has changed since the implementation of a pilot technology education project in 1998. This revised version was published online in July 2006 with corrections to the Cover Date.     

The demand for small cars in the United States: Implications for energy conservation strategies

The purpose of this paper was to investigate the impact of household characteristics and preferences for Japanese cars on the demand for small cars in the United States. Two stage probit analysis was used to examine the impact of various explanatory variables on the purchase decision. The results indicated that preferences for Japanese cars, income, price and several household characteristics had a significant impact on the probability of purchasing a small car. The results of this study provide support for freer trade in automobiles and higher gasoline taxes as energy conservation strategies.

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Zusammenfassung Die Nachfrage nach Kleinwagen in USA: Implikationen für Strategien zur Energieeinsparung. Diese Untersuchung wollte herausfinden, wie sich Haushaltseigenschaften und Präferenzen für japanische Autos auf die Nachfrage nach Kleinwagen in den Vereinigten Staaten auswirken. Die Stichprobe umfa\te 367 Haushalte, die im Jahr 1986 ein neues Auto kauften. Davon kauften 141 Haushalte amerikanische Kleinwagen, 84 japanische Kleinwagen und 142 Haushalte kauften gro\e amerikanische Wagen. Eine zweistufige Probit-Analyse prüfte den Einflu\ der verschiedenen Erklärungsvariablen auf die Kaufentscheidung. Die Ergebnisse besagen im wesentlichen, da\ es die Präferenzen für japanische Autos, das Einkommen, der Preis und einige Haushaltseigenschaften sind, die einen signifikanten Einflu\ auf die Wahrscheinlichkeit eines Kleinwagenkaufs haben. Die Autoren sehen in den Ergebnissen eine Unterstützung für die Forderung nach Freihandel im Automobilsektor und nach höherer Besteuerung von Kraftstoffen als Strategien zur Energieeinsparung.

     

DURATION MOMENTS AND YIELD CURVE MOVEMENTS

In this paper we will analyze the relationship between the value and duration moments of a cash flow and movements in the yield curve. We will show that for changes in the yield curve which can be related to tⁿ , the 1st order changes in the net present value of a cash flow are linearly dependent on the n + lth duration moments, and that the 2nd order changes are dependent on the sum of duration moments of order 2 n + 1 and 2 n + 2. We will use this relationship to tilt tracking portfolios so as to protect them against specific changes in the yield curve.     

Rural traffic management: The Burrator Reservoir experiment

The introduction of traffic management schemes has been one response of the National Parks to the problem of ever-increasing car-borne visitors and the consequent damage caused to the rural environment. By reviewing these schemes and by determining and explaining attitudes towards one particular traffic management experiment, the paper aims to deduce lessons for future policy. The analysis, based on two visitor surveys, suggests that the likelihood of success is improved when schemes are integrated, containing both ‘carrot’ and ‘stick’ elements. Since public perceptions are also found to be pivotal to its success, appropriate marketing of a scheme is vital. The paper concludes, however, that to achieve the fundamental objective of greater accessibility with less mobility, a more wide-ranging marketing effort is required intended to engender a sea change in attitude towards both the car and public transport.