Espectroscopía IR de sulfatos en clínkeres y cementos

Infrared spectroscopy is a very useful technique in Cement Chemistry. This work is devoted to the study of a large number of sulphates that should have an incidence in false set phenomena, and they are qualitative and semi-quantitatlvely studied when they are in some degree in the clinker or in the portland cement.La espectroscopía infrarroja es una técnica de gran utilidad en la Química del Cemento. En el presente trabajo se aplica al estudio de numerosos sulfatos que pueden tener incidencia en el fenómeno de falso fraguado, y se estudian cualitativa y semicuantitativamente cuando forman parte del clinker o cemento portland

Evaluación de cinco genotipos de haba (Vicia faba L.) con seis niveles de fósforo en Tecámac, México

Abstract. During the spring-summer of 2000, the investigation was carried out in field conditions utilizing a design of complete blocks, with 30 treatments and three repetitions with a factorial arrangement. The characteristics evaluated were height of the first legume (apv), final height (af), number of stems (nt), number of grains per legume (ngv), number of legumes per plant (nvp), weight of 100 seeds p(100)s and grain yield (rend). The analysis of variance (anova) revealed significant effects for genotypes in the variables p(100)s**, rend** and apv*. As for the phosphorus, the af and rend presented significant values to 0.05. The interaction gxf was highly significant for the rend. The best variety according to the dms was the v-32 (3.92 t ha-1). The characteristics that influenced the expression of grain yield were: nt, nvp and p(100)s

Fluoride in ash leachates: environmental implications at Popocatépetl volcano, central Mexico

Ash emitted by volcanic eruptions, even of moderate magnitude, may affect the environment and the health of humans and animals through different mechanisms at distances significantly larger than those indicated in the volcanic hazard maps. One such mechanism is the high capacity of ash to transport toxic volatiles like fluoride, as soluble condensates on the particles' surface. The mobilization and hazards related to volcanic fluoride are discussed based on the data obtained during the recent activity of Popocatépetl volcano in Central Mexico

Calibration of Piping Assessment Models in the Netherlands

Flood Defenc

Spectrum of hemifacial microsomia in a pre-term newborn: case presentation and literature review

The spectrum of hemifacial microsomia, or facio-auriculo-vertebral spectrum, is a complex of craniofacial and vertebral anomalies. Axis malformation is microtia, more often on the right side of 3:2. It may be associated with mandibular hypoplasia and vertebral malformations. It is more frequent in males and in twin pregnancies. Clinical case: Newborn male, preterm, of 29.5 weeks gestational age, twin product, second twin pregnancy, dichorionic and diamniotic, born by cesarean section, which presented hemifacial microsomia, microtia of the left Tanzer 3 and the right auricle of low implantation with a backward rotation, left appendices and macrostomia. A thoracoabdominal X-ray found hemivertebrae in the cervical and dorsal area, which discussed genetic performing diagnosis of the hemifacial microsomia spectrum. An ear TAC is done, the bone atresia of the left ear meeting at the level of the left ear without evidence of tympanic membranes and with a dysplastic oscicular chain attached to the lateral wall of the attic. Discharged at 78 days of chronological age with 6 days of age, corrected with the consultation of neonatal high-risk follow-up. Conclusion: Facial asymmetry must be widely evaluated in patients with microtia, including deliberate search of renal, cardiac and spinal-level conditions, in order to diagnose pathologies such as the spectrum of hemifacial microsomia early

The interactions that arise in the work for corners in Infantile Education

Este artículo forma parte de una investigación más amplia que aborda el conocimiento y la utilización de los rincones como recurso metodológico y didáctico en las aulas de Educación Infantil. Nos centraremos concretamente, en las interacciones que se producen entre el alumnado en dichos rincones a partir de la interpretación que hace el docente. La muestra considerada la ha formado 15 profesores de centros educativos (11 colegios públicos y 4 colegios concertados) de un ámbito urbano (ciudad mediana) y de un ámbito rural. La muestra participante ha sido de 74 docentes de dichos centros. La metodología que hemos utilizado ha sido cuantitativa, tomando como fuente de recogida de datos un cuestionario. Los resultados obtenidos muestran que el trabajo por rincones en las aulas de Educación Infantil tiene importantes beneficios para los niños de estas edades tanto para las interacciones sociales como las afectivasThis article is part of an investigation wider that tackles the knowledge and the use of the corners as methodological and didactic resource in the classroom of Infantile Education. We will center specifically, in the interactions that take place between the pupils in the above mentioned corners from the interpretation that the teacher does. The considered sample there have been teachers of 15 educational school (11 public schools and 4 compound schools) of an urban ambience(medium-sized city) and of a rural ambience,74 teachers of the above mentioned schools have been the taking part sample. The methodology that we have been quantitative using like data source a questionnaire. The obtained results show that the work of corners in the classrooms of Infantile Education has important benefits for the children of this age so much for the social interactions like the affective ones

Early hydration study of standard and doped Alite-Belite-Ye’elimite (ABY) cements through Synchrotron Radiation

The manufacturing of ye'elimite-rich cements releases from 15 to 37%, depending on their composition, less CO2 to the atmosphere than ordinary Portland cement (OPC). BYF cements containing belite, ye’elimite and ferrite as main crystalline phases, are promising eco-friendly binders. Nevertheless, belite, its main phase, shows a slow hydrating behaviour and the mechanical strengths are lower than OPC at early ages. Some alternatives to solve this problem are: i) forming alite jointly with belite and ye’elimite during clinkering, Alite Belite Ye’elimite (ABY) clinkers. The hydration of alite and ye’elimite would develop high mechanical strengths at early ages, and belite contributes to later curing times; ii) a second alternative is the stabilisation of alpha forms of belite using dopants such as boron named here after dABY. In this work, two different types of ABY clinkers (standard and doped) have been prepared and characterized to understand their different hydration mechanisms at the same water-to-cement (w/c) ratio. The clinkers have been prepared using CaF2 and ZnO as mineralizers, and borax as dopant agent to stabilize alpha forms of belite (’H-C2S). Afterwards, 14 wt% of anhydrite (as soluble sulphate source) was added to prepare the corresponding cements. Finally, the hydration study was performed at w/c ratio of 0.5. Here, an in-situ hydration study using synchrotron X-ray powder diffraction (SXRPD) for the first 14 hours of hydration is reported. Moreover, these results will be combined with the ex-situ laboratory X-ray powder diffraction study (LXRPD) at 1 day of hydration and calorimetric results. Rietveld quantitative phase analysis has been used to establish the phase evolution across the time.Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech. MINECO ( BIA2017-82391-R), co-funded by FEDER, and I3 [IEDI-2016-0079]

Large-scale regression with non-convex loss and penalty

We describe a computational method for parameter estimation in linear regression, that is capable of simultaneously producing sparse estimates and dealing with outliers and heavy-tailed error distributions. The method used is based on the image restoration method proposed in Huang et al. (2017) [13]. It can be applied to problems of arbitrary size. The choice of certain parameters is discussed. Results obtained for simulated and real data are presented

Defensa de los estatutos y noblezas españolas : destierro de los abusos y rigores de los informantes

Copia digital. Madrid : Ministerio de Cultura. Subdirección General de Coordinación Bibliotecaria, 2009Front. con tit.: "Apologia por la limpieça y nobleça de España ..."Sign.: []\p2\s, ¶\p8\s, []\p1\s, A-D\p2\s, A-K\p8\s, L\p2\s, M-T\p8\s, V\p4\s, A\p6\s, B\p8\sTexto a dos col. con apostillas marginalesEstán en bl. las p. 158 y 256. Hay numerosos errores tip. de pag. (ejmp. las p. 167 a 178 van numeradas de la 3 a la 14) y de sign.Port. con orla tip.Front. calc

Contrataciones mayores a 8 UIT y ejecución presupuestal en la municipalidad distrital de Pichanaqui 2021

Las contrataciones mayores a 8 Unidades Impositivas Tributarias comprendidas en la Ley de Contrataciones del Estado y su Reglamento, representan un porcentaje considerable en el presupuesto institucional de las entidades públicas peruanas. Es así que, el presente estudio respondió a ¿En qué medida las contrataciones mayores a 8 UIT se relacionan con la ejecución presupuestal?, estipulando como objetivo determinar la relación de las contrataciones mayores a 8 UIT con la ejecución presupuestal de la Municipalidad Distrital de Pichanaqui, en el año 2021. Para ello, se utilizó el método científico y deductivo, de tipo básica, con alcance correlacional, de diseño no experimental, transversal y correlacional, la técnica empleada fue la encuesta, como instrumento el cuestionario, aplicado a la muestra censal de n=43 trabajadores de la municipalidad que intervinieron en el desarrollo de los procedimientos de contratación y ejecución presupuestaria. Como resultado se obtuvo una correlación de Rho de Spearman Rho=0,703, significa que existe una correlación buena entre las variables, asimismo, se obtuvo un nivel de significancia bilateral de p=0,000, como consecuencia aceptándose la hipótesis alterna y rechazándose la hipótesis nula. Se concluyó que, las contrataciones mayores a 8 UIT se relacionan significativamente con la ejecución presupuestal, en ese sentido, mientras mejor se desarrollen las contrataciones y que las áreas usuarias intervinientes sean conscientes de su importancia, mejor será la ejecución presupuestaria en un determinado año fiscal, produciendo el cumplimiento de metas y siendo acreedores de bonos al presupuesto de la Entidad