1,721,212 research outputs found
Fonti statistiche per la storia economica dell'Italia unita: premessa
No full textPremessa a un numero monografico di «Quaderni Storici» che focalizza l’attenzione sulle fonti statistiche utilizzate per ricostruire la storia d’Italia nel ventesimo secolo. Il numero aggrega studiosi che hanno affrontato la storia della statistica nell’Italia del ‘900 da diversi punti di vista, allo scopo di mettere a frutto le conoscenze accumulate nel corso degli ultimi anni sulle caratteristiche proprie delle indagini quantitative realizzate dall’amministrazione pubblica e da privati nel corso dell’ultimo secolo, in vista di una reinterpretazione di alcuni aspetti della storia economica e sociale del periodo considerato
Morpurgo, Emilio
No full textBiografia di Emilio Morpurgo (1836-1886), economista e statistico, docente universitario e rettore dell'Università di Padova, deputato e segretario generale del ministero di agricoltura industria e commercio, commissario della giunta per l'inchiesta agraria
Gateways as inter-modal nodes in different ages: The Venetian region, eighteenth to twentieth centuries
Full text linkThis paper focuses on the theoretical implications of a regional case studyfor the analysis of transportation networks and gateway functions. Thestarting point is the result of a research on the changing role of gateways,and on the relocation of the gateway function from one city to a series ofcities in the Venetian region from the eighteenth to the twentieth century.Against this evolution, I test the validity and usefulness of a definition of thegateway as a point of inter-modal exchange for its historical interpretation.Changing transport technologies involve different organisations of inter-modal exchanges, and imply more or less intense economic functions ofgateway cities. These changes intertwine with political events and deci-sions, and more general economic changes: they could at the same time beread as an effect of these transformations, and as a causal factor. From this perspective, a study of intermodality shows to be useful to shed new lighton specific changes in the structure of urban hierarchie
The Free Port of Venice and its Establishment under the Habsburg Empire
No full textVenice was only granted the privileges of a free port in 1830, some decades after the fall of the Republic of Venice, when the city was part of the Habsburg Empire. Its commercial importance had already started to decline. The free port was conceived as a means to foster the economic recovery of the city in the framework of a wider policy intended at a better integration of Lombardy and Venetia or the Italian dominions of the Austrian Empire. This article, following a description of the historical conditions leading to the establishment of the free port, identifies the actors supporting and opposing this project. Their arguments and their ploys are also explained using memorial and archival sources. The economic effects of these measures are also assessed in the context of the changes that occurred in Venice until the free port’s abolition in 1874
Infrastrutture urbane e territoriali: Verona, Napoli, Catania, Garda occidentale, Ticino-Mincio, Arno.
No full textI saggi riuniti in questo fascicolo di «Storia urbana» rispondono a una domanda comune riguardante il rapporto tra città e infrastrutture, che trova declinazioni multiformi a seconda del luogo e del periodo considerato, della vicenda oggetto di studio e delle fonti utilizzate. La città è considerata sia in quanto oggetto passivo delle trasformazioni indotte dalla costruzione di nuove vie di trasporto e comunicazione, sia come soggetto attivo, capace di mobilitare le istituzioni e gli interessi locali per favorire la realizzazione di un progetto piuttosto che di un altro. Le infrastrutture, d'altra parte, sono state storicamente concepite sia come strumento atto a ridurre costi e tempi di trasporto in maniera tale da agevolare i flussi di merci e persone attraverso gli snodi già esistenti, rappresentati di norma dalle città stesse, sia come agente capace di suscitare la localizzazione di nuove attività e conseguenti trasformazioni della gerarchia urbana
The solution State of Nickel(II) and Nickel (I) in the Presence of Diphosphines in Acetonitrile. A Combined Electroanalytical and Spectrophotometric Approach.
No full textThe equilibria involving nickel(II), nickel(I) and nickel(0) in the presence of bidentate phosphine ligands in acetonitrile solution have been investigated by cyclic voltammetry, controlled-potential electrolysis, and spectrophotometry. The obtained results show that when both cone angles and PP distance make the diphosphine well-suited to act as a chelating ligand, only bis-chelate complexes of the type NiL2 are formed by nickel in all the three achieved oxidation states. Longer methylene chains interposed between the phosphorus atoms make the diphosphine less suited to act in a bidentate fashion, thus allowing lower-order complexes, e.g. NiLS2 (S = solvent), to be obtained for nickel in the +2 and +1 oxidation states. Evidence for the poor stability of the [NiILS2]+ complexes and for a higher-order complex of the type NiL3 for nickel(II) have also been obtained. The dependence of the reduction potentials on the nature of the diphosphine employed is discussed. © 1984
Reactivity of cyanogen with monocarbonylnickel(0) complexes. Examples of combined oxidative substitution and internal ligand substitution
No full textThe complex [Ni(CO)(dppb)2] (dppb = Ph2P[CH2]4PPh2) undergoes a two-stage reaction with C2N2 in CH2Cl2, at room temperature. The first stage gives almost equivalent quantities of [{Ni(CN)2(dppb)}2] and [Ni(CO)2(dppb)], whereas quantitative conversion of [Ni(CO)2(dppb)] into [{Ni(CN)2(dppb)}2] and CO is obtained in the second stage. The complexes [Ni(CO)(dppb){P(OR)3}](R = Et or Ph) react in a similar way under particular conditions. A kinetic investigation has been carried out on the first system and a reaction mechanism is proposed for its first stage
Removal torque of osseointegrated mini-implants: an in vivo evaluation
No full textThe possibility of using osseointegrated implants for orthodontic anchorage is well known. When absolute orthodontic anchorage is needed, mini-implants can be inserted in the non-alveolar bone area (e.g. palatal process or retromolar areas of the mandible). However, what happens to these implants at the end of treatment can be a problem as neither trephine explantation nor simply leaving the subgingival part of the implant in the bone permanently are acceptable solutions. In this investigation, 16 Exacta small screw titanium implants (Exacta MS series conical profi le, with a diameter of 3.3 mm and a length of 7.0 mm) were used as indirect orthodontic anchorage in 16 adult patients. The site of implant placement was established based on radiological investigations. There were eight palatal and eight retromolar implants inserted in seven males and nine females (mean age 30.3 years). On completion of treatment, the implants were unscrewed to the maximum limits of their removal torque values (RTVs) and the obtained data were analysed using a t -test. An in vitro study before the clinical trial was also undertaken to determine the maximum mechanical resistance of the unscrewing system. The clinical procedure and average RTV (67.91 ± 12.47 N/cm) were considered compatible with safe, non-invasive removal of the implant followed by rapid anatomical reconstruction of the area involved
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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