1,863 research outputs found
Graffito découvert près de Malte par le R. P. Magri
No full textBerger Philippe. Graffito découvert près de Malte par le R. P. Magri. In: Comptes rendus des séances de l'Académie des Inscriptions et Belles-Lettres, 48ᵉ année, N. 1, 1904. p. 33
Síndrome humoral y su expresión clínica
No full textPertenece al capítulo: "Problemas metabólicos en la oclusión intestinal" del Dr. R. Magri Costa y el Br. Efraín Margoli
EVALUATION OF THE MOISTURE AND ASH CONTENTS IN WHEAT MILLS BY MULTISTEP PROGRAMMED THERMOGRAVIMETRY
No full textThe determination of the moisture and ash contents in wheat mills was developed using multistep programmed thermogravimetric analysis. Preliminary research to determine the most suitable analytical conditions (carrier gas and flow rate, furnace temperature, isothermal time, type and weight of sample and size of particles) was also carried out. Commerical flours milled from soft and hard wheats with a wide range of fibre content were analysed using both the proposed method and the Italian official methods. The same results were obtained from all these methods. Nevertheless, the thermogravimetric method has some advantages: the analysis takes place on the same sample; it requires very small samples; and it is easy and rapid
A new formulation of collagenase ointment (Iruxol (R) mono) in the treatment of ulcers of the lower extremities - A randomised, placebo-controlled, double-blind study
No full textThe efficacy and tolerability of a new formulation of collagenase ointment (Iruxol(R) mono) was determined in a placebo-controlled randomised double-blind study. 30 patients with chronic ulcers of the lower extremities were treated with either Iruxol(R) mono or placebo ointment base for a minimum of 14 days. Treatment efficacy was determined by evaluating wound debridement, granulation, epithelisation and inflammation using 5-point scales and by measuring wound size. All parameters were assessed daily for the first 2 weeks of treatment and weekly thereafter. For all efficacy parameters, Iruxol(R) mono was significantly superior to placebo (p < 0.01). Differences reached statistical significance after 6 days of treatment for both debridement and inflammation, and after 4, 5 and 8 days for granulation, epithelisation and wound size, respectively. In addition to individual parameters, an investigator's rating of clinical global efficacy also demonstrated the superiority of Iruxol(R) mono (p < 0.001). Iruxol(R) mono and placebo were both well tolerated. Adverse events were minor and consisted of a burning sensation following ointment application in 3 patients in each group and erythema in a further 2 patients in each group. There were no withdrawals as a result of adverse events in either group. The relationship between adverse event and treatment was considered unlikely in all cases. In conclusion, Iruxol(R) mono was significantly superior to placebo in all estimates of efficacy in wound healing. Iruxol(R) mono was well tolerated with an adverse event profile similar to that of placebo
BENDING THE DOMING EFFECT IN STRUCTURE FROM MOTION RECONSTRUCTIONS THROUGH BUNDLE ADJUSTMENT
No full textStructure from Motion techniques provides low-cost and flexible methods that can be adopted in arial surveying to collect topographic
data with accurate results. Nevertheless, the so-called “doming effect”, due to unfortunate acquisition conditions or unreliable modeling
of radial distortion, has been recognized as a critical issue that disrupts the quality of the attained 3D reconstruction. In this paper we
propose a novel method, that works effectively in the presence of a nearly flat soil, to tackle a posteriori the doming effect: an automatic
ground detection method is used to capture the doming deformation flawing the reconstruction, which in turn is wrapped to the correct
geometry by iteratively enforcing a planarity constraint through a Bundle Adjustment framework. Experiments on real word datasets
demonstrate promising results
Reduction Properties of (001) Maghemite Surfaces
No full textUsing Density Functional Theory (DFT) calculations we have studied the reduction properties of the (001) maghemite (y - Fe 2 O 3 ) surface, which is a promising material for catalysis applications. We have calculated the formation energies of oxygen vacancies on the surface correlating them with the oxygen atom positions. We have found that the oxygen vacancy formation energy is lower for the oxygen atoms not bonded to the tetrahedral irons in the layer below the surface. Also, the presence of an iron vacancy in the third layer below the surface lowers the oxygen vacancy formation energy. An high oxygen vacancy formation energy correlates with a change in the oxidation state of some iron atoms
Surface reducibility, reactivity, and stability induced by noble metal modifications on the γ -Fe2O3maghemite (001) surfaces
No full textIn these last years large research efforts have been devoted to the synthesis and investigation of reducible metal oxide surfaces modified with metal atoms and nanoparticles for improving their performance in a number of advanced applications. Among reducible metal oxides, iron oxides have the advantage to be made up from two of the most common elements on Earth. In this paper we analyze the structural, electronic, and magnetic consequences of the insertion of isolated noble metal atoms (Cu, Ag, Au) on the γ-Fe2O3 (001) surface. We have considered many different configurations for the single atoms: adsorbed, substitutional to iron atoms, or to oxygen atoms, and, using first principles calculations, we have studied how the presence of the noble metal atoms on the surface influences the surface stability, its reducibility, and, therefore, its catalytic activity, and how these properties depend on the kind of noble metal atom and its position. Our results show that noble metal atoms adsorbed on the surface facilitate the adsorption of CO molecules, and, among them, Cu atoms are those that bind best to the surface also providing the strongest adsorption energy for the CO molecule. At ambient temperature and pressure the noble metal atoms prefer to substitute the iron atoms than to just adsorb on the surface, but for Ag atoms the adsorption and substitutional energies are very close. The surfaces with Ag in place of Fe are the most reducible and reactive for exchange of oxygen atoms. Finally, Au is the best noble metal for oxygen substitution. Our results provide useful insights for the researchers designing and synthesizing new noble metal - iron oxides nanostructures for applications in biology, medicine, catalysis, and chemical analysis
Reduction and Oxidation of Maghemite (001) Surfaces: The Role of Iron Vacancies
No full textThe knowledge of surface reduction and oxidation energetics in reducible oxides is essential for the design of improved catalysts for oxidation reactions. This is particularly true for iron oxides, a very attractive material system, because of the availability and biocompatibility of its constituents. In this work, by means of the density functional theory, we have thoroughly studied the ?-Fe2O3(001) maghemite surfaces, taking full account of iron vacancies beyond a mean field approach. Despite the structural similarity with the more studied magnetite Fe3O4 surfaces from which maghemite differs only for the presence of iron vacancies in the octahedral sites and for the absence of reduced Fe2+ cations, the surface properties are quite different. Our investigation shows that the presence of Fe vacancies is responsible for an increase in the surface reducibility. Also, it favors surface oxidation. The main reason is that the Fe vacancies cause a decrease of electronic charge of the surface oxygen atoms, which then become more reactive. We have considered different surface terminations and found that the reduced surfaces are more stable than the simple bulk-truncated ones. The reduction leads to a new reconstruction of the surface, which is the most stable surface termination among those investigated. We have examined the charge transfers and the modifications in the electronic structure caused by the surface reduction
BICM and TCM comparison in 100 Gbps optical coherent links in nonlinear regime
No full textThe popular single-carrier QPSK modulation format is compared with 8PSK BICM and TCM schemes in 100 Gbps optical links in linear and nonlinear regime, with or without inline dispersion compensation. © 2011 Optical Society of America
Thermal analysis of food carbohydrates by determination of starch gelatinization phenomena
No full textAbstract: A calorimetric (DSC) method for the analysis of starches and food-related compounds, based on the determination of onset and peak temperature (T-o, T-p) and the apparent enthalpy change (Delta H) of the starch gelatinization process is described. To set up the best experimental conditions to apply, the parameters that could affect the calorimetric response, such as temperature range of thermal analysis, water/starch ratio in the mixture, heating rate, size and weight of sample, time-temperature condition, were investigated. The method was applied to characterise starches, semolina and alimentary pasta
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