1,738 research outputs found
Dagli orologi solari sferici al mappamondo parallelo - uno strumento didattico
No full textLa sfere di Prosymna e di Matelica possono essere considerate le antenate di oggetti sferici cha dal 1600 in poi, sono stati costruiti in pietra per visualizzare lo spostamento del terminatore sul globo terrestre, in riferimento alle ore solari. In tempi più recenti orologi solari di forma sferica sono stati introdotti in parchi astronomici. Ne vengono mostrate le cratteristiche e la valenza didattica all'interno del Progetto Internazionale Globo Local
Veicoli Solari
No full textDomanda multipla di registrazione per Modello Comunitario “Veicoli Solari” (N. 006387387, depositato il 23.04.2019) relativo ad un prodotto classe ‘Automobili’ e Classificazione di Locarno n. 12.8, con lo scopo di proteggere tramite 21 viste le 3 evoluzioni di forma del veicolo solare (cod. ‘Emilia IV’)
Oscurità dei miti solari
No full textIndaghiamo l'origine e le variazioni della tradizione antichissima dei miti solari che nascondono e celano molti simboli ed archetipi dell'umano, quali l'ambivalenza e la molteplicità psichica e intrapsichica
Education in wind engineering
No full textThe author maintains that an adequate education in a discipline as vast and articulated as wind engineering cannot fail to recognize first its origins, developments, fundamentals, advancements and prospects. In this context, an analysis of the actual state of education should identify its limits, gaps and strengths, as well as the hard core of knowledge that should constitute the common basis for a mature and modern discipline capable of generating figures endowed with broad views and specialized skills. This vision may enhance new strategies to exploit technological evolution and communication systems, rationalize co-operative educational programs on wide territorial scales, involve different skills as in-depth as they are varied in the wind engineering community, reach those who need to establish and consolidate this culture, but do not have the opportunity to personally experience the manifold initiatives in the discipline, seize the interest of people towards wind engineering, spread its culture and know-how into everyday life and into society
Solari Aldo E. — Sociologia rural nacional
No full textG A. Solari Aldo E. — Sociologia rural nacional. In: Population, 13ᵉ année, n°4, 1958. p. 735
GIORGIO SIMONCINI, La Grandezza delle Capitali nel Dibattito dei Rifor- misti Illuministi. Napoli, Parigi, Londra, Florence, Olschki, 2021. Pp. 150. ISBN: 978-88-222-6756-6.
No full textLeo S. Olschki is publishing this elegant text written by Giorgio Si- moncini, an expert of historical matters related to urbanism, architecture and landscape. His expertise meets the history of economic ideas and policies as regards the debate on the dimension of towns among Eighteenth century En- lightenment’s reformers. Moreover, the author also compares Naples with similar debates in Paris and London. Naples was one of the most important centres of European Enlightenment and it was the main spring of the civil economy, whose authors we find analysed by Simoncini
Globaltest confidence regions and their application to ridge regression
No full textWe construct confidence regions in high dimensions by inverting the globaltest statistics, and use them to choose the tuning parameter for penalized regression. The selected model corresponds to the point in the confidence region of the parameters that minimizes the penalty, making it the least complex model that still has acceptable fit according to the test that defines the confidence region. As the globaltest is particularly powerful in the presence of many weak predictors, it connects well to ridge regression, and we thus focus on ridge penalties in this paper. The confidence region method is quick to calculate, intuitive, and gives decent predictive potential. As a tuning parameter selection method it may even outperform classical methods such as cross-validation in terms of mean squared error of prediction, especially when the signal is weak. We illustrate the method for linear models in simulation study and for Cox models in real gene expression data of breast cancer samples
Stepwise Reduction of Dinitrogen Occurring on a Divanadium Model Compound: A Synthetic, Structural, Magnetic, Electrochemical, and Theoretical Investigation on the [V=N=N=V]n+ [n = 4-6] Based Complexes
No full textThis report details an extensive investigation on vanadium-dinitrogen complexes containing the [V(mu-N-2)V](n+) skeleton with a variable oxidation state of the metal and reduction degree of dinitrogen, n varying from 6 --> 5 --> 4. This skeleton can be associated to alkali cations in ion-separated or ion-pair tight forms. The reaction of [(Mes)(3)V(thf)], 1 [Mes = 2,4,6-Me3C6H2], with Lewis acids [AlPh3, B(C6F5)(3)] removed the THF molecule lending under nitrogen to the formation of the diamagnetic complex [(Mes)(3)V(mu-N-2)V(Mes)(3)], 4. The reaction of 1 with N-2 also occurs under reducing conditions using Na or K metals. As supported by the electrochemical study, the preliminary stage is in both cases the formation of the vanadium(II) desolvated form [V(Mes)(3)](-), 5. The reaction of 5 with N-2 in the case of potassium and in the presence of 1 leads to the compound {[Mes)(3)V(mu-N-2)V(Mes)(3)](-)[K(digly)(3)](+)}, 11, which, depending on the reaction conditions, undergoes a further reduction to [{K(digly)(3)(mu-Mes)(2)(Mes)V}(2)(mu-N-2)], 12 [digly = diethylene glycol dimethyl ether]. Similarly, the reduction of 1 with sodium gave, depending on the workup mode, {[(Mes)(3)V(mu-N-2)V(Mes)(3)](2-)[Na(digly)(2)](2)(+)}, 13, or {[(Mes)(3)V(mu-N-2)(mu-Na)V(Mes)(3)](-)[Na(digly)(2)](+)}, 14. both containing the dianion [(Mes)(3)V(mu-N-2)V(Mes)(3)](2-), 8. Complex 1 releases upon protonation exclusively Nz. while complexes 11-14 release N-2, N2H4, and NH3 in amounts depending on the degree of reduction of the dinitrogen and the structure of the complex. The electrochemical reduction of 1 shed light on the intermediate formation of 5 and its conversion to 8, which was oxidized to the monoanion [(Mes)(3)V(mu-N-2)V(Mes)(3)](-), 7 (which is the precursor of 8 in the chemical reduction). The magnetic studies coupled with the theoretical interpretation are in agreement with the presence of a d(2)-d(2) couple in 4, a d(1)-d(1) in 12-14, and a d(1)-d(0) in 11. This, along with the structural studies on 11-14, suggest a cumulenic structure [V=N=N=V](+n) [n = 5, 4] for 11-14
La lutte des ouvrières de Solari à Udine
No full textDrevet Danièle. La lutte des ouvrières de Solari à Udine. In: Revue d'en face, n°3, 1978. pp. 46-47
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