1,721,058 research outputs found
A study on sodalite pellets as matrix for spent chloride salts confinement
No full textPellets made of pure sodalite blended with commercial glass frit and pellets made of sodalite, glass frit and a mixture of chloride salts, synthesized through dry pressing and subsequent thermal treatment, were evaluated as a potential matrix for confinement of spent chloride salts coming from pyroprocesses. The sodalite pellets were leached at 23°C and 90°C for 28 days, according to the ASTM C1220-10 procedure. Normalized release rates were estimated for the following elements: Li, Na, Al, Si, K, Rb, Cs, Sr, Ba, La, Nd and compared with literature results. SEM investigations, carried out before and after the leaching tests, show dissolution and re-precipitation phenomena at 90°C. Copyright © Materials Research Society 2017
- Commento alla circolare 6 giugno 2002 n. 8756 della Presidenza del Consiglio dei Ministri – Dipartimento per le politiche comunitarie – sulla condotta delle Stazioni Appaltanti nell’aggiudicazione degli appalti sotto soglia comunitaria
No full textCommento alla sentenza del Consiglio di Stato, Sezione V, 8 gennaio 2002, n. 3068, sul c.d. ‘taglio delle ali’ – Tra concorrenza e intese collusive, il rebus delle modalità di calcolo
No full textCommento alla circolare 1 marzo 2002, n. 3944, della Presidenza del Consiglio dei Ministri, sulle procedure di affidamento delle concessioni di servizi e di lavori
No full textCommento alla sentenza del Consiglio di Stato, Sez. V, 8 luglio 2002, n. 3796 sul risarcimento del danno da lesione di interessi legittimi negli appalti di servizi – Servizi equiparabili alle opere per valutare le responsabilità
No full textAn experimental study on Sodalite and SAP matrices for immobilization of spent chloride salt waste
No full textIn the frame of Generation IV reactors a renewed interest in pyro-processing of spent nuclear fuel is underway. Molten chloride salt waste arising from the recovering of uranium and plutonium through pyro-processing is one of the problematic wastes for direct application of vitrification or ceramization. In this work, Sodalite and SAP have been evaluated and compared as potential matrices for confinement of spent chloride salt waste coming from pyro-processing. To this aim Sodalite and SAP were synthesized both in pure form and mixed with different glass matrices, i.e. commercially available glass frit and borosilicate glass. The confining matrices were loaded with mixed chloride salts to study their retention capacities with respect to the elements of interest. The matrices were characterized and leached for contact times up to 150 days at room temperature and at 90 °C. SEM analyses were also performed in order to compare the matrix surface before and after leaching. Leaching results are discussed and compared in terms of normalized releases with similar results reported in literature. According to this comparative study the SAP matrix with glass frit binder resulted in the best matrix among the ones studied, with respect to retention capacities for both matrix and spent fuel elements. © 2017 Elsevier B.V
Commento alla sentenza del Consiglio di Stato n. 5714/2002 in materia di illeciti anticoncorrenziali commessi dai partecipanti a gare pubbliche
No full textSome haematic parameters in the Muscovy duck
No full textStandard values of some haematic parameters (glucose, tot. cholesterol, phospholipids, triglycerides, NEFA, Total protein, free-cholesterol) were given for the Muscovy drake after sexual maturity. Triglycerides and free-cholesterol levels showed no significant differences. Winter values of glucose were significantly lower than the ones registered in the other seasons, while tot. cholesterol showed the highest levels only in winter. Haematic contents of NEFA and tot. protein presented significant differences between seasons with the highest values in summer. In spring the maximum level of phospholipids was observed
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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