HIGH-TECHNOLOGY JOBS AND WORKER MOBILITY*

ABSTRACT. The premise of this paper is that one can discover much about the location determinants of high-technology industry by examining the location (migration) decision of workers with high-technology occupations. A model of the high-technology worker migration decision is developed that permits estimation of worker response to both personal and area characteristics, the latter chosen to mirror location factors often cited by high-technology firms as important for both the attraction and retention of their specialized work force. Logit estimates of this model between 1975 and 1980 are presented. The paper is concluded with a discussion of policy implications.     

EVALUATION OF THE MANGANESE ESR METHOD OF MARBLE CHARACTERIZATION

Results suggest that ESR studies of Mn⁺² in marble can provide an excellent discriminator for the determination of marble provenance. In comparison with other methods of quantitative analysis for manganese such as AA or NAA, the ESR method determines only Mn⁺² rather than total Mn, is inexpensive and rapid with no chemical preparation required, and does not consume the sample.     

PROVENIENCE STUDY OF MEDIEVAL BULGARIAN GLASSES BY NAA AND CLUSTER ANALYSIS

The neutron activation analysis results from 30 glass samples were subjected to cluster analysis. The reliable localization of part of the medieval glass finds from Preslav enabled the evaluation of the variety of the production of a medieval glass workshop (ninth-tenth century), allowing conclusions to be made about the technological level of glass-making in Bulgaria during the Middle Ages. The work proved that NAA followed by cluster analysis is a successful approach to finding the local and chronological features of the investigated glasses.