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  • Articles  (48)
  • 1990-1994  (35)
  • 1970-1974  (13)
  • Geography  (48)
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  • Articles  (48)
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  • 1
    Electronic Resource
    Electronic Resource
    THE ECONOMICS OF AIR TRAVEL GRAVITY MODELS (1970)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of regional science 10 (1970), S. 0 
    Details
    ISSN: 1467-9787
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geography , Economics
    Notes: Starting with the aggregate demand model of economics, a model of demand for intercity air travel is developed which contains the gravity model as a less general submodel. The more general model is referred to as the alternative opportunities model since it takes account of alternative destinations open to travelers, not just origin and destination as does the gravity model. The demand model approach has the virtue of providing a theoretical basis for understanding and analyzing the gravity model.The gains from treating alternative locations and demand motivation variables are a substantial increase in explanatory power over that yielded by the gravity model, the identification of statistically significant determinants of air travel, and better measurement of the coefficients of population and distance by taking account of these other variables and somewhat better forecasts.A shortcoming of procedures used here is aggregation of air trips with different purposes and thus lack of clear specification of the size of effects of different variables on different types of travel. Overcoming this difficulty must await origin-destination data listed by trip purpose.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1467-9787.1970.tb00057.x
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  • 2
    Electronic Resource
    Electronic Resource
    DEMAND IN SPACE: SOME NEGLECTED ASPECTS (1971)
    Oxford, UK : Blackwell Publishing Ltd
    Papers in regional science 27 (1971), S. 0 
    Details
    ISSN: 1435-5957
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geography , Economics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1435-5597.1971.tb01504.x
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  • 3
    Electronic Resource
    Electronic Resource
    A COMPLEMENTARY TOOL TO WATER QUALITY INDEX: FUZZY CLUSTERING ANALYSIS (1992)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 28 (1992), S. 0 
    Details
    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: : A general methodology for fuzzy clustering analysis is developed and illustrated with a case study of water quality evaluation for Dianshan Lake, Shanghai, China. Fuzzy clustering analysis may be used whenever a composite classification of water quality incorporates multiple parameters. In such cases, the technique may be used as a complement or an alternative to comprehensive assessment. In fuzzy clustering analysis, the classification is determined by a fuzzy relation. After a fuzzy similarity matrix has been established and the fuzzy relation stabilized, a dynamic clustering chart can be developed. Given a suitable threshold, the appropriate classification is worked out. The methodology is relatively simple, and the results can be interpreted to provide valuable information to support decision making and to aid water quality management.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1752-1688.1992.tb03174.x
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  • 4
    Electronic Resource
    Electronic Resource
    A TRADE-OFF ANALYSIS OF ALTERNATIVE WATER USES (1990)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 26 (1990), S. 0 
    Details
    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: : In the western United States, hydropower and agriculture often cempete for surface waters. Since water markets are imperfect, allocations are often made through institutional arrangements and policy The purpose of this paper is to compare the gross water returns from agriculture with hydropower in terms of water use in Idaho. For the year 1986, returns from agriculture averaged $200 per acre-foot, and returns from hydropower averaged $8.00 per acre-foot.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1752-1688.1990.tb01360.x
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  • 5
    Electronic Resource
    Electronic Resource
    REPLY TO DISCUSSION by Bruce A. McCarl AND Ronald C. Griffin: “A Trade-Off Analysis of Alternative Water Uses” (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 27 (1991), S. 0 
    Details
    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1752-1688.1991.tb01485.x
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  • 6
    Electronic Resource
    Electronic Resource
    REPLY TO DISCUSSION by David B. Willis and Norman K. Whittlesey: “A Trade-Off Analysis of Alternative Water Uses” (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 27 (1991), S. 0 
    Details
    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1752-1688.1991.tb01487.x
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  • 7
    Electronic Resource
    Electronic Resource
    Farlie-Gumbel-Morgenstern bivariate densities: Are they applicable in hydrology? (1992)
    Springer
    Stochastic environmental research and risk assessment 6 (1992), S. 47-54 
    Details
    ISSN: 1436-3259
    Keywords: Bivariate density ; dependence structure ; correlation coefficient ; Farlie-Gumbel-Morgenstern density ; Farlie polynomial density
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Energy, Environment Protection, Nuclear Power Engineering , Geography , Geosciences
    Notes: Abstract Certain bivariate densities constructed from marginals have recently been suggested as models of hydrologic variates such as rainfall intensity and depth. It is pointed out that (i) these densities belong to the families of the Farlie-Gumbel-Morgenstern densities and the Farlie polynomial densities, which have been extensively studied in the statistical literature, and that (ii) these densities have a limited potential applicability in hydrology since they can model only weakly associated variates, whose product-moment correlationR is within the range |R|≤1/3, under the first family of densities, and |R|≤1/2 under the second family.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01581674
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  • 8
    Electronic Resource
    Electronic Resource
    Demand in space: Some neglected aspects (1971)
    Springer
    Papers in regional science 27 (1971), S. 45-60 
    Details
    ISSN: 1435-5957
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geography , Economics
    Notes: Summary This paper delves into a more explicit analysis of demand in space than has been undertaken heretofore. Utility theory is used to develop the concepts of spatial income-distribution effect, spatial-induced income effect, and spatial substitution effect, the effects on demand of changes or differences in location. Indifference curve analysis is employed to give a graphical interpretation to these concepts. The use of this general approach to demand in space makes it apparent that the usual assumption of uniform partial demand curves is logically inconsistent in a spatial context. An assumption of spatial homogeneity of general demand functions and of income distribution is found to imply (1) generally nonidentical partial demand curves at different points in space, and thus that the existence of the demand cone requires special conditions, (2) cases where purchases may rise with increasing distance from the mill, (3) the lack of independence among the ranges of different goods, and (4) nonuniformity in the size of ranges for a given good (a) sold at different centers and (b) sold in different directions from one center. Further work on this topic is indicated along the lines of loosening the many restrictions imposed during the analysis. Two-dimensional rather than the linear markets, discriminatory f.o.b. or equalized delivered pricing rather than nondiscriminatory f.o.b. pricing, and a transportation system with limited rather than ubiquitous access are some cases in point.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01954599
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  • 9
    Electronic Resource
    Electronic Resource
    Air travel, spatial structure, and gravity models (1970)
    Springer
    The annals of regional science 4 (1970), S. 97-107 
    Details
    ISSN: 1432-0592
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geography , Economics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01294893
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  • 10
    Electronic Resource
    Electronic Resource
    Distance, intervening opportunities, city hierarchy and air travel (1971)
    Springer
    The annals of regional science 5 (1971), S. 152-161 
    Details
    ISSN: 1432-0592
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geography , Economics
    Notes: Summary and Conclusions This study examines the influence of the spatial structure of city locations on air travel by considering the factors of intervening opportunities and the hierarchical system of cities in addition to the simple dimension of distance. The statistical results show that the familiar strength of the gravity model is matched by that of the intervening opportunities model, but only when all cities are analyzed together. The disaggregation of cities by size and region (hierarchy) leads to a spotty performance by both models. The generality of the gravity and intervening opportunities models is thus called into question, and the potency of the hierarchical city organization as a contributing influence determining air traffic flows is demonstrated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01288120
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