Handling alternative refrigerants safely
Refrigerants of one kind or another have been used for cooling in manufacturing since the 19th century. But only recently have they been the focus of so much attention. The phaseout of CFC-based substances has led to the development of a number of alternatives, each with its own characteristics, properties, and purposes. Properly handling and using these replacements benefit from an examination of their compositions and behaviors and review of the use of refrigerants overall.
This paper presents the ore reserve estimation of the Novaz-za (Italy) uranium deposit. The approach used in the first stage of the study is merely based on the chemical analyses of samples and can be considered as a “classical” geostatistical study of a thick stratiform low-grade deposit. In the second stage an attempt is made to use more efficient techniques than standard kriging in order to take into account additional information (ra-rioactivity measurements). For this purpose, cokriging has been adopted. A short introduction to this method is given.