Search results for " Total"
showing 10 items of 385 documents
Nanocomposites of bacterial cellulose/hydroxyapatite for biomedical applications.
2008
In the present work, a nanocomposite material formed by bacterial cellulose (BC) networks and calcium-deficient hydroxyapatite (HAp) powders was synthesized and characterized. The HAp nanoparticles were previously prepared by a wet chemical precipitation method, starting from aqueous solutions of calcium nitrate and di-ammonium phosphate salts. Energy-dispersive spectroscopy reveals that the prepared HAp corresponds to calcium-deficient hydroxyapatite. BC-HAp nanocomposites were prepared by introducing carboxymethylcellulose (CMC) into the bacteria culture media. HAp nanoparticles were then introduced and remained suspended in the culture medium during the formation of cellulose nanofibrils…
Risk Burden of Coronary Perforation in Chronic Total Occlusion Recanalization: Latin American CTO Registry Analysis
2022
Background Coronary perforation is a life‐threatening complication of acute percutaneous coronary intervention (PCI) for chronic total occlusions (CTO), but data on midterm outcomes are limited. Methods and Results Data from LATAM (Latin American)‐CTO Registry (57 centers; 9 countries) were analyzed. We assessed the risk of 30‐day, 1‐year major adverse cardiac events of coronary perforation using time‐to‐event and weighted composite end point analysis having CTO PCI without perforation as comparators. Additionally, we studied the independent predictors of perforation in these patients. Of 2054 patients who underwent CTO PCI between 2015 and 2018, the median Multicenter CTO Registry in Japa…
Review and comparison of experimental techniques used for determination of thin film electro-optic coefficients
2015
The results of electro-optic coefficient measurements performed with three commonly applied techniques used to assess electro-optic coefficients: the Mach–Zehnder, the Teng–Man, and the attenuated total reflectance technique are reported. It is shown that the signal obtained by the Mach–Zehnder and Teng–Man techniques is strongly influenced by the multiple internal reflection and piezo- and electrostrictive thickness change effects, which in our opinion have not been addressed sufficiently in the literature. A novel approach based on using Abeles matrix formalism is implemented for the retrieval of electro-optic coefficients from experimental data. The measurement results, errors, and compa…
Prediction of organic carbon and total nitrogen contents in organic wastes and their composts by Infrared spectroscopy and partial least square regre…
2017
Middle and near infrared (MIR and NIR) were employed to determine organic carbon (OC) and total nitrogen (TN) in different soil organic amendments including wastes, composts and mixtures of composts and organic wastes. Prediction models based on partial least squares (PLS) regression from the spectra of untreated samples were built. Different spectra preprocessing strategies were adopted and the best number of latent variable was evaluated using leave-one-out cross-validation. Attenuated total reflectance (PLS-ATR-MIR) and diffuse reflectance (PLS-DR-NIR) models were built and evaluated from root mean square error of cross validation and prediction (RMSECV and RMSEP), coefficients of determ…
Author's reply: Laryngopharyngeal reflux as a potential cause of persistent local neck symptoms after total thyroidectomy.
2020
Repercusión en la productividad de las empresas por la implantación de los sistemas de calidad a través de los costos de calidad
2008
Es indudable que la calidad es una variable estratégica relevante en un entorno competitivo, que garantiza cuotas de mercado mayores y tasas de beneficios que, normalmente, son crecientes con el nivel de calidad. Esta afirmación se relativiza cuando introducimos consideraciones de costos. Esta ponencia es una aproximación empírica al análisis de los costos de calidad, así como de los sistemas, metodologías y herramientas de gestión de la calidad. Se han contrastado varias hipótesis con tests estadísticos aplicados a información procedente de encuestas de 182 empresas españolas certificadas en la Norma ISO 9000. Además de obtener una panorámica descriptiva referente a los costos y la gestión…
Trasplante alogénico de progenitores hematopoyéticos en adultos con leucemia linfoblástica aguda
2020
Los avances terapéuticos en la leucemia linfoblástica aguda (LLA) han sido notables en los últimos años con la incorporación de esquemas de quimioterapia más intensivos, los inhibidores de tirosina quinasa y los grandes avances en el campo del trasplante alogénico de progenitores hematopoyéticos (TPH). El objetivo del estudio ha sido analizar los resultados del TPH en una amplia serie de pacientes adultos con LLA y proponer ideas de mejora. Para ello, un primer estudio ha evaluado exhaustivamente el tipo de donante, fuentes de progenitores hematopoyéticos e intensidad del acondicionamiento en una serie retrospectiva de 211 pacientes con LLA del Hospital Universitario y Politécnico La Fe (HU…
Todos muertos. La guerra total imaginada
2007
Tras la Primera Guerra Mundial, en el llamado periodo de entre-guerras,la población civil y las élites culturales europeas se dedicaron a imaginar cómo sería la guerra del futuro. Tal imaginación tuvo como eje la concepción de la guerra total. Con todo, en España, tal imaginación se hibridaba con un tipo de guerra diferente, la guerra colonial (regular/guerrillera o partisana)
In situ ATR-IR studies in aqueous phase reforming of hydroxyacetone on Pt/ZrO2 and Pt/AlO(OH) catalysts: The role of aldol condensation
2018
Abstract In situ Attenuated Total Reflection Infrared (ATR-IR) spectroscopy was used to study Aqueous Phase Reforming of hydroxyacetone on Pt/AlO(OH) and Pt/ZrO2 catalysts at 230 °C/ 30 bar. Formation of strongly adsorbed aldol condensation products was observed on the surface of Pt/ZrO2 and ZrO2 in contrast to Pt/AlO(OH) and AlO(OH). Peak assignments were supported by DFT calculations of the IR spectra of the condensation products in vacuum and in the presence of water. Aldol condensation of hydroxyacetone leading to compounds with high molecular weight with unsaturated bonds was suggested as a first step in coke formation. Carbonaceous deposits on the surface of the ZrO2 support are oxyge…
Solutions to the 1-harmonic flow with values into a hyper-octant of the N-sphere
2013
Abstract We announce existence results for the 1-harmonic flow from a domain of R m into the first hyper-octant of the N -dimensional unit sphere, under homogeneous Neumann boundary conditions. The arguments rely on a notion of “geodesic representative” of a BV-vector field on its jump set.