Investitionsvolumen und Herausforderungen eines nationalen Glasfaserausbaus in Deutschland

Der fl?chendeckende Glasfaserausbau in Deutschland ist mit hohen Kosten verbunden. Insbesondere die Anschlüsse in dünn besiedelten Gebieten lassen die Kosten steigen. Die Autoren berechnen verschiedene M?glichkeiten der Kostenaufteilung.     

Local Community Involvement in Tourism around National Parks: Opportunities and Constraints

National Parks are often major tourist attractions located in relatively remote and marginalised rural areas. The potential role of tourism in contributing to the costs of conservation and providing economic opportunities for communities living adjacent to natural heritage has long been recognised. Issues of access to tourists and capital, enclaves and bypasses and employment need to be addressed. The opportunities for local economic development through tourism at Komodo (Indonesia), Keoladeo (India), Gonarezhou (Zimbabwe) and Puerto Princesa (Palawan, Philippines) National Parks are explored, and the paper concludes with an agenda for action.     

Subsidisation of Upland Conservation in West Java: The Citanduy II Project 1

The Citanduy II Project's model farm program on steep slopes in West Java was started in 1981 with the dual goals of reducing erosion and increasing farmer incomes. Limited success in reaching both goats has been achieved. Subsidies used to implement the program, however, could have been allocated more efficiently.     

Concepts of extended preference

This paper remedies ambiguity in the discussion of interdependent preferences by developing a consistent set of distinctions, which span the full range of sympathetic and antipathetic interaction, for the two-person case without reactive behavior. It defines concepts such as benevolence, generosity, altruism, destructiveness, and willingness to begrrudge transfers to others and indicates how their use can clarify the discussion of economic behavior. The definitions take account of preferences (indicated by rates of substitution) and prices (indicated by rates of exchange) at critical income allocations.     

再见,祝你好运,下周见

这是公司发展史上策划最周详的过渡之一.两年前,微软公司董事长比尔·盖茨宣布,他将放手在这家他与别人共同创建的公司的日常管理责任,把更多的时间投入慈善事业.从那以后,盖茨和微软公司首席执行官史蒂芬·巴尔默提拔了那些将会接替盖茨,为微软公司开发技术、战略和远景的人.     

Interpretation problems of the partial correlation with nonnormally distributed variables

The partial correlation is a commonly used measure for assessing the bivariate correlation of two quantitative variables after eliminating the influence of one or more other variables. The partial correlation is generally interpreted as the correlation that would result if the variables to be eliminated were fixed (not allowed to vary and influence the other variables), which is referred to in the statistical literature as conditional correlation. The present paper demonstrates, by means of theoretical derivations and practical examples, that when the assumption of multivariate normality is violated (e.g., as a result of nonlinear relationships among the variables investigated) the usual interpretation of the partial correlation coefficient will be basically incorrect. In extreme cases the value of the partial correlation coefficient may be strongly positive, close to 1, whereas the conditional correlation may have a large negative value. To solve this problem the paper suggests to partial out a certain function (in most cases the square) of the variables whose effects are to be eliminated if nonlinear relationships are likely to occur.