Non-invasive on-site method for thickness measurement of transparent ceramic glazes based on depth from focus

Glazed ceramics are a common material analyzed through geochemistry, whether in the form of tableware collected during excavations or tiles observed as part of architectural features. Within the framework of these studies, measuring the thickness of the transparent glaze is one of the useful variables available for the characterization of the ceramic, contributing to searches for provenance as well as serialization. However, this task often requires invasive methods performed in the laboratory, which may not always be possible. This paper develops a non-invasive and portable on-site system for measuring the thickness of ceramic glazes. Based on the depth from focus technique, this method makes use of a classical camera, a macroscopic lens, a translation stage, and a laptop for system control. In this article, we test this method through the measurement of glaze for ten samples as compared to results obtained for sections through scanning electron microscopy.     

Milieux innovateurs: Determinants and policy implications

National and regional differences are more and more frequently explained by differences in milieux. This type of explanation raises three questions: Can we identify milieux? What are the determinants of milieux? Are there differences between industries in the matter of determinants of milieux? Most studies on milieux innovateurs are based on case studies and qualitative data. This paper is quantitative and comparative in nature. It attempts to identify milieux and their determinants by using data from the 1999 Statistics Canada Innovation Survey. Based on two synthetic indicators of interactions (weak/strong) and learning (weak/strong), four categories of milieux innovateurs are differentiated which become the dependent variables. In order to see what the determinants of the various milieux innovateurs are and to see in what ways the most favorable milieux innovateurs compare to the others, binomial logit models have been estimated for four industries using the following independent variables: competitive pressures, barriers to knowledge exchange, use of government support, number of employees, collaborative arrangements, R&D activities, regions.     

Toward a Strategy to Deploy the Internet in Developing Countries

Internet access is highly concentrated in developed countries. Developing countries are interested in Internet applications in order to enter the global market and improve development plans. A strategy to deploy the Internet in developing countries must be viewed within the comprehensive economic development perspective. It should emphasize three goals: overcoming barriers to information; overcoming barriers to economic opportunities; and overcoming barriers to participation. To achieve these goals, two sets of plans are required: first, there must be plans to activate a research environment, using the requirements of Internet access; and second, priorities of Internet applications must be decided. According to the suggested strategy, applications follow this sequence: e‐government; e‐learning; and e‐commerce.