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1.
Significant increases in atmospheric carbon dioxide are occuring as a result of fossil fuel combustion. More than a four-fold increase over preindustrial levels may occur by the year 2100. Heating of the atmosphere, changes in precipitation patterns and global storm paths, and other resulting effects are sure to cause significant social changes. This article is essentially a methodological case study demonstrating a useful but inexpensive type of technology assessment. It summarizes current research findings on “the CO2 effect,” and presents hitherto unpublished findings that resulted from a brief but systems-oriented approach. These findings suggest that most published forecasts of phenomena associated with a CO2 buildup may be systematically low because various positive feedback relationships are not reflected. 相似文献
2.
刘易斯模型与托达罗模型的否定之否定--城市化战略的理论回顾与现实思考 总被引:8,自引:0,他引:8
城市化是刘易斯二元经济发展理论的基本政策含义。否定刘易斯模型的托达罗模型导致了农业发展低水平均衡、经济增长低效率和经济结构低级化等消极后果。走出托达罗困境的可行选择 ,是经过修正和补充的刘易斯模型的复归。伴随着发展中国家经济发展战略重点的转换 ,经济发展理论走出了一条螺旋式上升的成长道路 相似文献
3.
文章介绍了基于单片机的红外串行通信接口的设计方案。该系统主要由TI公司的MSP430系列单片机和SHARP公司的GP2W0116YPS芯片构成。文章介绍了红外通信技术、器件选择和系统硬件设计,并结合软件设计说明了系统要实现的功能,最后通过VB设计的软件验证了该设计方案的可行性。实验结果表明,该系统控制方便,工作稳定,在微型化、低功耗的前提下能实现可靠的非接触式实时数据传输,在工程实践中具有重大的应用价值。 相似文献
4.
R.W. Hafer 《Journal of Economics and Business》1984,36(1):85-93
This article investigates the issue of whether M1 or the monetary base should be used as an intermediate target for monetary policy. Because the target variable should be reliably related to future economic activity, each aggregate is used in estimating a small macromodel which consists of a nominal GNP growth equation and an inflation specification. The empirical results indicate that M1 better explains GNP growth and inflation for the period 1960–1980. Forecast errors of GNP growth from 1970–1980 are reduced when M1 is used instead of the adjusted base, although there is little difference between inflation forecasts. Based on the evidence presented in this study, M1 is preferred as the intermediate target variable. 相似文献
5.
Donald W. Jackson Lonnie L. Ostrom Kenneth R. Evans 《Industrial Marketing Management》1982,11(4):269-274
Given the importance of controlling marketing efforts, a study was conducted of industrial manufacturers to determine the extent of their use of various measures to evaluate different marketing activities. The predominate measures used for evaluation were sales volume with much less utilization of profitability, productivity, and expense measures. 相似文献
6.
本文介绍了无线应用协议(WAP)中的无线传输层安全规模(WTLS),说明了WTLS解决无线互联网络安全问题的机制及其有效性,并指出了一些有待解决的潜在安全问题。 相似文献
7.
借鉴国内外企业实施多元化经营的成功经验与失败教训,从培养企业核心能力出发,阐述了正确决策和实施多元化经营的几个关键问题,即4W(why、when、where和what),指出正确的多元化经营战略同样有利于企业核心能力的培养。 相似文献
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For many years now the academic governmental-budgeting literature has concentrated almost exclusively on the politics and economics of the budgetary process at the expense of the mechanical foundations. Consequently, we see an interesting but insulated discussion about political involvement and about the strengths and weaknesses of planning models. What we do not see is a discussion of the accounting perspective. This paper offers such a discussion. It explains local government budgeting as “ex ante financial accounting” and offers some important implications of this re-interpretation. 相似文献