Improving fuel utilization in steel mill operations using linear programming

This paper describes the use of linear programming to improve the fuel utilisation at a major Midwestern steel mill. In particular, linear programming is used to determine an efficient fuel allocation plan for this steel mill, which reduces the total fuel costs for the steel mill operations. The efficient fuel allocation plan that is developed utilises two externally purchased fuels: natural gas and fuel oil, and two gases: blast furnace gas and coke plant gas, which are internally generated as natural by-products of the production process. Test results from the application of the linear programming model are presented and discussed, and indicate that considerable cost savings can be achieved by utilizing a fuel allocation plan which more effectively utilizes the by-product gases which are produced within the steel making process.     

Testing hypotheses of ghetto morphology

Socioeconomic urban policy has generally treated the American black ghetto as a single community or neighborhood. A study of recent literature suggests that the socioeconomic structure of ghetto space may be developing a spatially systematic heterogeneity. The literature has suggested several hypotheses concerning the socioeconomic morphology of ghetto space, but heretofore these hypotheses have not been tested in any rigorous fashion. This is the objective of this study. The results of these tests suggest that the ghetto is indeed developing as a socioeconomically heterogeneous subsystem spatially parallel to the overall urban system. This implies that a multiplicity of communities or neighborhoods are developing over time. In order to be effective, the processes of urban planning and policy development must address this evolving pattern.     

Monopsonistically/monopolistically competitive regional development: Public correction of market outcomes

A model of regional market development is constructed which captures the inefficiencies typical in most of the related literature, and a variety of corrective policy options are explored. For taxes and subsidies, there is no dominant policy with each limited by the zero-profit constraint on entry, informational problems, or adverse distributional considerations. Discriminatory pricing decreases efficiency, but uniform pricing achieves optimal allocations. Public production has certain informational advantages.     

Process,goal, and social interaction differences in recreation: What makes an activity substitutable

Abstract

In the present study two recreational activities, deer hunting and goose hunting, both similar in form, are compared. The study shows that the activity with the fewest perceived substitutes, deer hunting, also showed higher mean ratings on items measuring the importance of various elements of the experience, such as the process of participation, the goal of the activity, and the social interaction that accompanies the activity by the participants. Deer hunters also reported greater participation in the activity by peers and were more likely to be introduced to the activity by a family member. It is argued that these differences in the importance of the elements of the experiences influence the perceived substitutability of a recreational activity.     

Industrialization, Female Labor Force Participation, and the Modern Division of Labor by Sex

We examine the effect of industrialization on female labor force participation for 62 countries. Two hypotheses are tested: the emancipation hypothesis and the U-shaped hypothesis. Our results support the U-shaped hypothesis insofar as shifts in the distribution of occupations in early industrialization decrease female labor force participation by removing women from agriculture while excluding them from occupations in manufacturing and management. We further suggest that different paths to industrialization may have different effects on female labor force participation.     

Research notes and communications corporate restructuring and strategic change: The effect on diversification strategy and R & D intensity

In the 1980s a number of large corporations restructured their diversified businesses through divestitures. It is hypothesized that restructuring activity focused on firms at intermediate levels of diversification (e.g., related-linked) which have a mixture of related and unrelated business units. Results confirm this hypothesis which explains that such mixed corporate strategies create organizational and control inefficiencies in managing both related and unrelated types of business units. Restructured firms were also found to move towards two types of different internal capital markets (related and unrelated). Most restructuring firms moved toward lower levels of diversification (e.g., related-constrained), although some moved toward higher levels of diversification (e.g., unrelated business). Also, this study finds restructuring firms that changed their corporate strategy by reducing diversified scope increased their R&D intensity. Firms that restructured and increased their diversified scope decreased R&D intensity. This result suggested a partial substitution between diversification and R&D activity.     

The fundamentals of land prices and urban growth

In a very simple model in which capital is durable and landowners have perfect foresight, the price of urban land has four additive components: the value of agricultural land rent, the cost of conversion, the value of accessibility, and the value of expected future rent increases, a growth premium. In rapidly growing cities, the growth premium may easily account for half of the average price of land and may create a large gap between the price of land at the boundary (minus conversion cost) and the value of agricultural land rent.