Algebraization of logics defined by literal‐paraconsistent or literal‐paracomplete matrices

We study the algebraizability of the logics constructed using literal‐paraconsistent and literal‐paracomplete matrices described by Lewin and Mikenberg in [11], proving that they are all algebraizable in the sense of Blok and Pigozzi in [3] but not finitely algebraizable. A characterization of the finitely algebraizable logics defined by LPP‐matrices is given. We also make an algebraic study of the equivalent algebraic semantics of the logics associated to the matrices ??³_2,2, ??³_2,1, ??³_1,1, ??³_1,3, and ??⁴ appearing in [11] proving that they are not varieties and finding the free algebra over one generator. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)     

Determination of ethyl formate in magnesium chloride used as Ziegler-Natta catalyst support by Fourier transform infrared attenuated total reflectance spectrometry

FT-IR Spectroscopy with total attenuated reflectance (ATR) was used for the quantitative determination of ethyl formate coordinated in inorganic matrices such as magnesium chloride. The spectra were recorded directly on solutions obtained by dissolving the inorganic Ziegler-Natta supports in water. The method proposed is sensitive and rapid and appears to be very reliable when compared with other methods, such as solvent extraction followed by gaschromatographic or thermogravimetric analysis.     

A journey through quality control

The Euroanalysis VII conference in Vienna included a two-day session: Quality Assurance in Analytical Chemistry. The contributions comprised 15 lectures devoted to: intra-laboratory quality measures, inter-laboratory control, formal aspects and accreditation and implementation. The paper presents an overview of the main items developed by the contributors.A survey on the session on Quality Assurance in Analytical Chemistry of Euroanalysis VIIThe authors thank the organizers of EUROANALYSIS VII and in particular Dr. B. Griepink and Dr. E. Maier of the Community Bureau of Reference (BCR) of the CEC for their support and considerable contributions.     

Su un gruppo di casi relativi ad onde magneto-idrodinamiche non omogenee

Sunto Riferendosi ad un fluido perfetto, incompressibile e di conducibilità elettrica infinita, soggetto ad un campo magnetico stazionario opportunamente assegnato, si introducono le equazioni della magneto-idrodinamica espresse in generiche coordinate curvilinee ortogonali. Si ricercano poi delle opportune ipotesi sotto le quali per tali equazioni è possibile il calcolo completo del campo magneto-idrodinamico, che risulta propagarsi per onde non omogenee nella direzione del detto campo magnetico stazionario assegnato. Sono poi trattati casi particolari in coordinate cartesiane e in coordinate cilindriche.     

L'integrazione e la ricerca delle primitive rispetto ad una funzione continua qualunque

Sunto Si estende la teoria classica dell'integrale diLebesgue-Stieltjes al caso di una funzione determinante continua qualunque ; si definisce poi un'operazione analoga alla totalizzazione, che permette di costruire, rispetto ad una tale funzione, ogni primitiva a partire dalla derivata. A Mauro Picone nel suo 70^mo compleanno