196,043 research outputs found
Il restauro della chiesa di San Domenico a Terracina di Giuseppe Zander. Una lettura attraverso le fonti e la realtà
No full textSi presenta, per la prima volta, uno studio storico-critico di un progetto di restauro realizzato dall'architetto Giuseppe Zander nella metà del XX secolo. Lo studioso conosce il tessuto storico urbano e le emergenze architettoniche presenti nella parte medievale della città di Terracina, per averne redatto, tra il 1947 e il 1950, il Piano di Ricostruzione in seguito ai danni bellici, e per avervi eseguito non pochi altri incarichi, di studio e di progetto.
Una serie importante di documenti d'archivio sono alla base delle considerazioni proposte in questo breve saggio. La metodologia di studio si fonda quindi da una parte, sull'analisi diretta dell'architettura allo stato attuale, dall'altra su un'attenta lettura critica della documentazione recuperata presso gli archivi consultati nel Lazio. Questo è un dato assai importante, anche in considerazione della storia che la chiesa medievale ha vissuto in tempi più recenti, distinti da una "tragica" alternanza di abbandono e progetti di "valorizzazione".
Obiettivo quello di comprendere gli orientamenti teorici delle scelte progettuali condotte, in un particolare momento storico, quello dell'immediato dopo guerra, da un giovane architetto e appassionato studioso.For the first time, a historical-critical study on a conservation project designed by architect Giuseppe Zander in the mid-twentieth century is presented. The scholar has a sound knowledge of the historic urban fabric and architectural features typical of the medieval district of Terracina, having drafted, between 1947 and 1950, the Reconstruction Plan to tackle war damages issues and for having delivered many other studies and projects in the same area.
Important archive documents are the basis of the considerations proposed in this short essay. The methodology is based therefore both on the direct analysis of architecture at present, and on a careful critical analysis of the archive documents consulted in Lazio. It leads to significant results, also related to the history that the medieval church has experienced in recent times: a "tragic" alternation of neglect and "development projects".
The aim of this research is to understand the theoretical criteria of design choices, in the peculiar time of the immediate post-war period, by a young architect and passionate scholar
Lights on tardigrade biodiversity: integrative redescription of Eremobiotus alicatai (Eutardigrada, Isohypsibiidae) with new insights on its morphology, phylogeny, and biogeography
No full textCurrent knowledge on the genus Eremobiotus still remains limited. Only three species are known, mainly recorded in the Palaearctic region, with Eremobiotus alicatai representing the most common species. In the present study, an integrative re-description of E. alicatai based on the examination of a topotypic population from Sicily (Italy) is given, the morphological characters of which perfectly correspond to those of the type series collected in 1969. A second population of E. alicatai, from Tuscany (Italy), was also investigated from the morphological and the molecular point of view, allowing examining the intraspecific variability of the species. A re-analysis of the morphology of specimens of the type series, along with a morphological analysis of specimens of the two investigated populations of E. alicatai, allowed for an update and correction of certain morphological traits in the species. The topotypic and the Tuscanian populations were both investigated through a molecular approach: COI, ITS2, 18S, and 28S gene sequences were obtained, allowing to update the Isohypsibioidea phylogeny and to discuss the correct placement of the genus Eremobiotus. Moreover, the definition of the morphology of the claws of Eremobiotus-type and new observations regarding the buccal opening are discussed
Crystal chemistry of Al-rich biotites coexisting with muscovites in peraluminous granites
No full textA comparison was made between single-crystal structure refinements, electron microprobe analy ses and octahedral site populations of seven biotite crystals and data obtained previously for coexisting muscovite in peraluminous granites using the same methods. Both micas, From several plutons of Northern Victoria Land (Antarctica) and Sardinia (Italy), show significant octahedral substitutions: biotite has a composition characterized by relatively high Al-[6] content (0.32 less than or equal to Al-[6] less than or equal to 0.59 apfu), whereas muscovite is characterized by phengite-like substitutions [0.12 less than or equal to ([6])(Mg + Fe + Ti + Mn) less than or equal to 0.35]. Mean bond-lengths and electron count data for six biotites-1M (space group C2/m. agreement factor 2.7% less than or equal to R-obs less than or equal to 3.6%) and a biotite-2M(1) (space group C2/c, R-obs = 2.8%) show that Al substitutes for divalent cations in the octahedral M2 site and that the Fe and Mg distribution is disordered. The mean tetrahedral bond lengths determined for biotite-2M(1) reflect Al-Si disorder. In coexisting muscovite-2M(1) crystals, small positive electron density residuals close to M1 site position as well as the increase in M2 mean atomic number is in agreement with the presence of a significant phengitic component. Reduction in biotite unit-cell dimensions with the increase of Al follows a pattern similar to that of associated muscovites. and the octahedral site volumes of both micas are influenced by the Al saturation index (ASI) of the rock. These results, and the calculated partition coefficients between biotite and muscovite for elements in M sites, are consistent with continuous reaction and re-equilibration of biotite and muscovite during crystallization of peraluminous granitic melts
A new Bernard–Praly-like observer for sensorless IPMSMs
No full textA slight extension of the global Bernard–Praly gradient adaptive observer – originally presented for nonsalient-pole surface Permanent Magnet Synchronous Motors (PMSMs) and recently proved to own local exponential convergence properties under well-known observability conditions – is here designed and proposed for Interior Permanent Magnet Synchronous Motors (IPMSMs) (with relatively small saliency) in the case in which the q-axis current is constant. It guarantees local exponential estimation – from stator current and voltage measurements – of both the stator fluxes and the sinusoidal/co-sinusoidal functions of the motor electrical angle, with no modification of the previous persistency of excitation condition requirements. Such an extension complements – at least locally – a previous analysis concerning IPMSMs under constant d-axis current. Applications to the sensorless control of IPMSMs (with realistic simulations) are included
Inductance Based Lumped Parameter IPM Machine Model for Fast Simulation
No full textIn this paper a fast simulation lumped-parameters motor model was developed for Interior Permanent Magnet motors. The model is based on the Ld and Lq inductance maps and permanent magnet flux derived from 2D FEA with frozen permeability method. It allows to obtain a simple and efficient machine model which can simulate the motor including the saturation, cross saturation and iron losses effects. The model relays only on apparent inductances so there is no need of additional simulations to evaluate the leakage inductance or differential inductances. In addition a representation of the iron losses is included in the model based on an equivalent resistor pt in series in each phase. This allows a better estimation of the voltage drop and the currents dynamic behaviour during the machine working cycle especially at high speed. This fast simulation model allows to obtain an accurate dynamic simulation of the motor coupled with the inverter, control loops and the load
Dr. Duane M. Jackson, Morehouse College, July 2011
No full textThis video is a conversation with Dr. Duane M. Jackson. Dr. Jackson talks about his paper, "Recall and the Serial Position Effect: The Role of Primacy and Recency on Accounting Students' Performance." Jackie Daniel, AUC Woodruff Library, is the interviewer
"Reflections on the subject of Emigration from Europe with a view to Settlement in the United States" By M. Carey.
No full text"Reflections on the subject of Emigration from Europe with a view to Settlement in the United States: containing bried sketches of the moral and political character of those states.
By M. Carey, member of the American philosophical, and of the American Antiquarian Society, and author of The Olive Branch, Cindiciae Hibernicae, essays on banking, on political economy, and on internal improvement.
To which are now added the English editor's comments on the subject; together with Important Advice to Emigrants, and Cautions Against Impositions Practiced in the Outports
Dispelling the Myths Behind First-author Citation Counts
No full textWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
Risks and benefits of animal-assisted interventions for critically ill patients admitted to intensive care units
No full textBackground: Pets offer significant health benefits, from decreased cardiovascular risks to anxiety and post-traumatic stress improvements. Animal-assisted interventions (AAI) are not frequently practiced in the intensive care unit (ICU) for fear of health risk for critical patients because there is a hypothetical risk of zoonoses. Objectives: This systematic review aimed to collect and summarize available evidence about AAI in the ICU. The Review questions were “Do AAI improve the clinical outcome of Critically Ill Patients admitted to ICUs?” and “Are the zoonotic infections the cause of negative prognosis?”. Methods: The following databases were searched on 5 January 2023: Cochrane Central Register of Controlled Trials (CENTRAL), EMBASE, and PubMed. All controlled studies (randomized controlled, quasi-experimental, and observational studies) were included. The systematic review protocol has been registered on the International Prospective Register of Systematic Review (CRD42022344539). Results: A total of 1302 papers were retrieved, 1262 after the duplicate remotion. Of these, only 34 were assessed for eligibility and only 6 were included in the qualitative synthesis. In all the studies included the dog was the animal used for the AAI with a total of 118 cases and 128 controls. Studies have high variability, and no one has used increased survival or zoonotic risk as outcomes. Conclusions: The evidence on the effectiveness of AAIs in ICU settings is scarce and no data are available on their safety. AAIs use in the ICU must be considered experimental and follow the related regulation until further data will be available. Given the potential positive impact on patient-centered outcomes, a research effort for high-quality studies seems to be justified
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