Pragmatic guidelines for determining road investment priorities in developing countries
作者:Brian Field、Duncan Hamilton
DOI:10.1080/13504500209470118
日期:2002.9
In many developing countries, the determination of a ranking of investments designed to improve and extend the road system is a commonplace prerequisite of planning for the transport sector as a whole and the road sub-sector within it. A major objective of determining investment priorities is to secure the greatest efficiency in the use of resources allocated to the sector and, for this reason, any system of assigning priorities must rely upon conventional investment appraisal techniques producing quantifiable measures of worth. Exercises of this kind, in which road investments are identified and ranked, are usually undertaken to produce a road sector investment plan. The implementation of such plans is, however, often compromised because of perceived deficiencies with a methodology which places undue reliance on investment appraisal and fails to properly address the issue of public interest and sustainability. This paper attempts to produce a pragmatic set of ground rules which, while mindful of the need to promote economic efficiency, allow for other factors to be embraced in a more holistic methodology.
�ber Sitosterin
作者:Richard Buri�n
DOI:10.1007/bf01518263
日期:1897.12
Synthesis of biological markers in fossil fuels. 4. C27, C28, and C29 13.beta.,17.alpha.(H)-Diasteranes
作者:Phillip E. Bauer、David A. Nelson、David S. Watt、Joseph H. Reibenspies、Oren P. Anderson、Wolfgang K. Seifert、J. Michael Moldowan
DOI:10.1021/jo00350a003
日期:1985.12
196. Long-range effects in alicyclic systems. Part I. The rates of rearrangement of some steroidal dibromides