Search results for "45"
showing 10 items of 1896 documents
Mans mnemòniques en l’Ars demonstrativa de Ramon Llull
2014
Aquest article recupera el concepte d’art de la memòria aplicat a les obres de Ramon Llull a partir de la presentació i el comentari de figures de mans amb finalitats mnemotècniques, especulatives i predicadores, que es troben en els manuscrits lul·lians de l’Ars demonstrativa –escrita el 1283– datats del segle xiii i el xvi. En els manuscrits de Venècia (Bibl. Marciana, Lat. VI. 200), de Bèrgam (MA 365) i de San Candido (B. della Collegiata, VIII C.8), la mà està vinculada a la figura S de l’Ars demonstrativa. En el ms &.IV.6 de l’Escorial, en canvi, la mà representa la figura A. El precedent més rellevant d’aquesta iconografia manual és la mà guidoniana, en l’àmbit musical, juntament amb …
Long-term X-ray variability of the microquasar system LS 5039/RX J1826.2−1450
2003
We report on the results of the spectral and timing analysis of a BeppoSAX observation of the microquasar system LS 5039/RX J1826.2-1450. The source was found in a low-flux state with Fx(1-10 keV)= 4.7 x 10^{-12} erg cm^{-2} s^{-1}, which represents almost one order of magnitude lower than a previous RXTE observation 2.5 years before. The 0.1--10 keV spectrum is described by an absorbed power-law continuum with photon-number spectral index Gamma=1.8+-0.2 and hydrogen column density of NH=1.0^{+0.4}_{-0.3} x 10^{22} cm^{-2}. According to the orbital parameters of the system the BeppoSAX observation covers the time of an X-ray eclipse should one occur. However, the 1.6-10 keV light curve does…
Effects of the exercise in the cerebral blood flow and metabolism: A review
2015
In recent years it has been shown that cerebral blood flow is affected by intense exercise, what may even lead to a reduction in the cognitive capacity. This statement is contrary to the traditional belief that cerebral blood flood remains constant and unaltered even when exercise is performed. During physical exercise of moderate intensity, cerebral blood flow increases in the cerebral areas responsible for movement. Moreover, recent studies have observed that cerebral blood flow decreases during high-intensity exercise as a consequence of a local hyperventilation and vasoconstriction of the areas with lower cerebral activity. Traditionally, the glucose has been considered as the main and …
Protection by beverages, fruits, vegetables, herbs, and flavonoids against genotoxicity of 2-acetylaminofluorene and 2-amino-1-methyl-6-phenylimidazo…
2002
Abstract Chinese hamster lung fibroblasts, genetically engineered for the expression of rat cytochrome P450 dependent monooxygenase 1A2 and rat sulfotransferase 1C1 (V79-rCYP1A2-rSULT1C1 cells), were utilized to check for possible protective effects of beverages of plant origin, fruits, vegetables, and spices against genotoxicity induced by 2-acetylaminofluorene (AAF) or 2-amino-1-methyl-6-phenylimidazo[4,5-b]pyridine (PhIP). Antigenotoxic activities of juices from spinach and red beets against AAF could be monitored with similar effectivity by the HPRT-mutagenicity test (IC50=0.64%; 2.57%) and alkaline single cell gel electrophoresis (comet assay; IC50=0.12%; 0.89%) which detects DNA stran…
L’impatto del burnout, ansia e disturbi del sonno sulla qualità della vita degli infermieri di area critica: un protocollo di ricerca.
2022
Introduzione: La Qualità della Vita, viene definita dall’Organizzazione Mondiale della Sanità come “La percezione dell’individuo della propria posizione nella vita nel contesto dei sistemi culturali e dei valori di riferimento nei quali è inserito e in relazione ai propri obiettivi, aspettative, standard e interessi”. In relazione alla categoria infermieristica emerge un dato poco incoraggiante dalla letteratura internazionale; soltanto il 3,6% di essa è soddisfatta della propria attività lavorativa e professionale, inoltre in larga misura gli infermieri ritengono che molti aspetti della propria qualità della vita siano poco soddisfacenti. Materiale e metodi: Studio osservazionale multicent…
Un metodo single-point basato sulla IEEE 1459-2000 “effective apparent power resolution” per l’individuazione dei carichi disturbanti nei sistemi ele…
2009
A single-point approach based on nonactive power factor for the assessment of harmonic distortion sources in power systems
2022
This paper presents a study on the use of power factor indicators for the assessment of harmonic distortion sources in power systems. In detail the analysis is focused on the comparison between the proposed nonactive power factor (Q1/N) and the indicators of the IEEE Std. 1459-2010, and on the indicators feasibility in identifying the presence of harmonic distortion sources. As discussed in the paper, the proposed indicator can be evaluated with good accuracy, by means of typical power quantities measurements at the point of common coupling (PCC). Thus its measurement can be feasibly implemented in commercial platforms used for smart metering applications. To verify the proposal validity, s…
Long-Term Consequences of Water Pumping on the Ecosystem Functioning of Lake Sekšu, Latvia
2020
Cultural eutrophication, the process by which pollution due to human activity speeds up natural eutrophication, is a widespread and consequential issue. Here, we present the 85-year history of a small, initially Lobelia&ndash
Genome-wide meta-analysis identifies six novel loci associated with habitual coffee consumption
2015
Contains fulltext : 155360.pdf (Publisher’s version ) (Closed access) Coffee, a major dietary source of caffeine, is among the most widely consumed beverages in the world and has received considerable attention regarding health risks and benefits. We conducted a genome-wide (GW) meta-analysis of predominately regular-type coffee consumption (cups per day) among up to 91,462 coffee consumers of European ancestry with top single-nucleotide polymorphisms (SNPs) followed-up in ~30 062 and 7964 coffee consumers of European and African-American ancestry, respectively. Studies from both stages were combined in a trans-ethnic meta-analysis. Confirmed loci were examined for putative functional and b…