ELECTRON SPIN RESONANCE STUDY OF WHITE MARBLES FROM THARROS (SARDINIA): A REAPPRAISAL OF THE TECHNIQUE,POSSIBILITIES AND LIMITATIONS*

The characterization of various samples of white marble from the archaeological site of Tharros (Sardinia) is the starting point for the reexamination of the capabilities of electron spin resonance (ESR) spectroscopy as a tool for identifying the quarries of origin of ancient marble artefacts. Existing methods and data bases are employed for the assignment of our samples, but also reviewed to see if a more extensive use of the technique is feasible. It turns out that ESR spectroscopy, coupled with other available methods, may readily provide valuable information, often yielding the final answer to the problem of marble provenance. However, it is also clear that much work has still to be done to standardize the data collection and analysis procedures and to expand the available data base.     

Forecasting Structural Change With a Regional Econometric Input-Output Model

The sophistication of regional economic models has been demonstrated in numerous ways, most recently in the form of linking several modeling systems or in the expansion in the number of equations that can be manipulated successfully to produce impact analyses or forecasts. In this paper, an alternative perspective is employed. What do regional macro-level forecasts indicate about the process of structural change? A new methodology is illustrated that enables analysts to make forecasts of detailed structural change in the interindustry relations in an economy. Using a regional econometric input-output model developed for the Chicago metropolitan region, derived input-output tables are extracted for the period 1975–2016. These tables are then analyzed to determine the forecasted direction of structural changes for the region. The innovation illustrated here is based on a model that exploits the general equilibrium spirit of computable general equilibrium models through the adjustment of input coefficients to clear markets.     

CENTER POINTS, EQUILIBRIUM POSITIONS, AND THE OBNOXIOUS LOCATION PROBLEM

ABSTRACT. Real variable analysis has een used to great benefit in a variety of classical problems in location theory. In this paper we explore basic complex variable techniques in one formulation of the obnoxious location problem. A general definition of center points is first given and used to formulate several alternate versions of the obnoxious location problem. A logarithmic transformation is then used to demonstrate some equivalences between these families of distinct location problems (defined via center points). A prototype logarithmic potential function which results from this formulation is then investigated, and it is demonstrated that the extremal solutions with this objective reside on the boundary of its domain of definition. An application using zero- and one-dimensional centers is discussed, and a generalization to the spatial obnoxious problem is also briefly examined. We define a zero-dimensional center as a critical point of the logarithmic potential function, and it is shown that these centers are equivalent to the solutions of the Complex Moment Problem.     

A MIXED-FREQUENCY MODEL OF REGIONAL OUTPUT*

ABSTRACT. This paper proposes a new method for estimating a monthly regional production model. The technique involves treating the region's monthly industrial output as a latent variable, which is in turn a function of capital (prosed by energy usage) and labor inputs. Annual observations on regional value added correspond to the summation of the unobservable monthly series over the 12 months, while changes in the national Industrial Production index help infer the series' month-to-month fluctuations. The model is estimated using the Kalman filter and the method of maximum likelihood. The estimates are used to compute monthly indices of regional value added for 15 individual 2-digit industries, and for the aggregate manufacturing sector in the Seventh Federal Reserve District. In a comparison of out-of-sample forecasting accuracy, the mixed-frequency model outperforms both the traditional parametric Cobb-Douglas and nonparametric Atlanta methods over the 1988–89 forecasting horizon.     

The Danes on the Gold Coast: culture change and the European presence

Denmark was one of several European nations which vied for West African trade between the seventeenth and nineteenth centuries. The Danes established more than thirty forts, trading lodges and plantations on the Gold Coast, and they played an important role in the development of African-European relations in the region. Traces of Danish outposts and the results of recent excavations at the Daccubie plantation are briefly surveyed. The available data illustrate the circumscribed nature of African-European interaction on the Gold Coast, providing insight into the context in which culture change occurred within African populations. The archaeological record of European expansion in Africa and elsewhere is used to illustrate the varying nature of European contact.

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Résumé Le Danemark était l'une des nombreuses nations européennes qui rivalisaient pour le commerce avec l'Afrique occidentale entre le dix-septième et le dix-neuvième siècles. Les Danois établirent plus de trente forts, comptoirs commerciaux et plantations sur la Côte de l'Or, et jouèrent un rôle important dans le développement des relations afro-européennes dans la région. Des traces de postes coloniaux danois et les résultats d'excavations récentes à la plantation de Daccubie sont brièvement passés en revue. Les données existantes illustrent le caractère limité de l'interaction afro-européenne sur la Côte de l'Or, donnant des indications sur le contexte dans lequel un changement culturel se produisit parmi les populations africaines. Les témoignages archéologiques de l'expansion européenne en Afrique et ailleurs servent à illustrer la nature changeante du contact européen.