36,779 research outputs found
Águila, G., Luciani, L., Seminara, L. y Viano, C. (Comps.) (2018). La historia reciente en Argentina. Balances de una historiografía pionera en América Latina. 1 edición. Imago Mundi: Buenos Aires 304 Páginas
No full textÁGUILA, G., LUCIANI, L., SEMINARA, L. y VIANO, C. (Comps.) (2018). La historia reciente en Argentina. Balances de una historiografía pionera en América Latina. 1 edición. Imago Mundi: Buenos Aires 304 Páginas
EFFICACIA DELL'ASSOCIAZIONE TRA UN BETA-AGONISTA "LONG ACTING" E UN CORTISONICO AD ELEVATO TROPISMO PER LA MUCOSA BRONCHIALE NEL MANAGEMENT DELL'ASMA
No full textAI-assisted methodology for robust digital measurements by Raman spectroscopy: Quantification of inorganic pollutants in water
No full textRaman spectroscopy is a versatile analytical tool, yet it often struggles with low sensitivity, hardware noise, and environmental interference. To address these limitations, this study presents an automated, Artificial Intelligence (AI)-assisted methodology to convert noisy optical signals into robust digital measurements. The process involves acquiring high-dimensional, noisy spectral data from analyte solutions. A grid search across various algorithms identifies the optimal pre-processing pipeline to minimize noise variance and ensure metrological repeatability. Instead of relying on raw sensor feeds, the method fits a Gaussian curve combined with a polynomial baseline to the data, extracting precise measurements from the peak of this mathematical model. Supported by AI, the method successfully separates multiple optical signals and their shifts originating from interactions among analytes, proving itself capable to compensate also for possible hardware misalignment and thermal drift. As such, it can be used to quantify the concentration of selected inorganic pollutants in a mixture of analytes. The primary application addressed in this work is quantifying inorganic pollutants in water, to enable in situ analysis without continuous expert supervision. Tests on binary and ternary mixtures of inorganic pollutants in pure water demonstrated that the Mean Absolute Percentage Error (MAPE) for nitrate was consistently below 10% in the concentration range between 0 mg/L to more than 15 000 mg/L, dropping to under 5% for concentrations exceeding 1000 mg/L. For concentrations below 1000 mg/L, the Mean Absolute Error (MAE) values were 67 mg/L for nitrate, 1475 mg/L for sulfate, and 736 mg/L for nitrite, respectively
Teorie femministe nella filosofia tra Ottocento e Novecento: dall'uguaglianza alla differenza
No full textFilosofie femministe ottocentesche. S. de Beauvoir filosofa della liberazione femminile. Il femminismo della differenza tra Italia ed Europa
Halogen addition to NHC-gold(I) chloride complexes in the framework of the Inverted Ligand Field
No full textThe conversion of LAuX to LAuX3, where L is a neutral ligand such as a phosphane or a carbene and X = Cl, Br or I, can be performed by halogen addition reactions in mild conditions. The formation of complexes with mixed halides, such as LAuY2X, also evoking the possibility of geometrical isomerization, is less investigated. In this work the iodine and bromine addition reactions, under mild conditions, to a symmetrically disubstituted carbene 1,3-dimethyl-imidazolyl-2-yl-gold(I)chloride were considered. The molecular structures highlight the formation of the trans LAuI2Cl in the case of iodine addition and a mixture of the geometrical isomers for bromine. DFT analysis points out a stepwise addition of halogen atom to the linear gold(I) complex without a net change in metal electronic population, suggesting the occurrence of the Inverted Ligand Field
Ecological and evolutionary response of Tethyan planktonic foraminifera to the middle Eocene climatic optimum (MECO) from the Alano section (NE Italy)
No full textThe enigmatic middle Eocene climatic optimum (MECO) is a transient (~500kyr) warming event that significantly interrupted at ~40 Ma the long-term cooling through the middle and late Eocene, eventually resulting in establishment of permanent Antarctic ice-sheet. This event is still poorly known and data on the biotic response are so far scarce. Here we present a detailed planktonic foraminiferal analysis of the MECO interval from a marginal basin of the central-western Tethys (Alano section, northeastern Italy). The expanded and continuous Alano section provides an excellent record of this event and offers an appealing opportunity to better understand the role of climate upon calcareous plankton evolution. A sapropel-like interval, characterized by excursions in both the carbon and oxygen bulk-carbonate isotope records, represents the lithological expression of the post-MECO event in the study area and follows the δ18O negative shift, interpreted as representing the MECO warming.High-resolution quantitative analysis performed on both >38 μm and >63 μm fractions reveals pronounced and complex changes in planktonic foraminiferal assemblages indicating a strong environmental perturbation that parallels the variations of the stable isotope curves corresponding to the MECO and post-MECO intervals. These changes consist primarily in a marked increase in abundance of the relatively eutrophic subbotinids and of the small, low-oxygen tolerant Streptochilus, Chiloguembelina and Pseudohas-tigerina. At the same time, the arrival of the abundant opportunist eutrophic Jenkinsina and Pseudoglobigerinella bolivariana, typical species of very high-productivity areas, also occurs. The pronounced shift from oligotrophic to more eutrophic, opportunist, low-oxygen tolerant planktonic foraminiferal assemblages suggests increased nutrient input and surface ocean productivity in response to the environmental perturbation associated with the MECO. Particularly critical environmental conditions have been reached during the deposition of the sapropel-like beds as testified by the presence of common giant and/or odd morphotypes. This is interpreted as evidence of transient alteration in the ocean chemistry.The enhanced surface water productivity inferred by planktonic foraminiferal assemblages at the onset of the event should have resulted in heavier δ13C values. The recorded lightening of the carbon stable isotope preceding the maximum warmth therefore represents a robust indication that it derives principally by a conspicuous increase of pCO2. The increased productivity of surface waters, also supported by geochemical data, may have acted as mechanism for pCO2 reduction and returned the climate system to the general Eocene cooling trend. The oxygen-depleted deep waters and the organic carbon burial following the peak of the MECO event represent the local response to the MECO warming and suggest that high sequestration of organic matter, if representing a widespread response to this event, might have contributed to the decrease of pCO2 as well. Though the true mechanisms are still obscure, several lines of evidence indicate a potential pressure on planktonic foraminiferal evolution during the MECO event including permanent changes besides transient and ecologically controlled variations
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