As an advanced process detection technology, electrical impedance tomography (EIT) has widely been paid attention to and studied in the industrial fields. But the EIT techniques are greatly limited to the low spatial resolutions. This problem may result from the incorrect preprocessing of measuring data and lack of general criterion to evaluate different preprocessing processes. In this paper, ...

Eugene Garfield’s article, “Citation indexes for science” [Science 122, 108 (1955)], is interesting beyond doubt. If we had in our library a citation index such as he proposes, I should use it to advantage. Amid today’s overwhelming difficulties in scientific communication, however, this index would solve too few problems to justify its surely great cost at this time. Even though all the cited ...

As indicated last week, Cut-rent

OBJECTIVE To assess the pollution of water bodies by domestic sewage and to evaluate the basic sanitation conditions of residences and the knowledge of the local population concerning intestinal parasitic diseases and the hazards they present to public health. METHODS Thirteen water samples were collected from each of four sites in different water bodies of the Bairro da Serra region, in Ipor...

This paper proposes a new methodology to build composite coincident and leading indexes. Based on a formal definition that requires that the first differences of the leading index is the best linear predictor of the first differences of the coincident index, it is shown that the notion of polynomial serial correlation common features can be used to build these composite variables. Concepts and ...

Prais (1958) showed that the standard CPI computed by most statistical agencies can be interpreted as a weighted average of household price indexes, where the weight of each household is determined by its total expenditures. In this paper, we decompose the difference between the standard CPI and a democratically weighted index (i.e., the CPI plutocratic gap) as the product of expenditure inequa...