Clinkering and hydration study of non-active and active Belite-Alite-Ye'elimite (BAY) cements

The aim of AIM is to promote industry-driven, interdisciplinary research in material science and engineering in order to provide leading-edge, sustainable solutions to the challenges facing engineers in today’s changing society and environment. http://www.ucl.ac.uk/aim/conference-info/37ccsThe manufacturing process of ye'elimite rich cements emit about 15-37% less CO2 to the atmosphere than OPC. Cements that contain belite, ye’elimite and ferrite, known as BYF cements, are promising eco-friendly binders. However, belite, their main phase, shows a slow hydrating behaviour; therefore the corresponding mortars present lower mechanical strengths than OPC at early ages. To solve this problem, BYF clinkers can be activated by: i) forming alite jointly with belite and ye’elimite during clinkering, known as BAY clinkers. The alite and ye’elimite reaction with water should develop high mechanical strengths at early ages, besides, belite contributes to later curing times. ii) A second activation is based on the stabilisation of alpha forms of belite by dopants. The objective of this work is to obtain two types of BAY clinkers (standard and active BAY) using CaF2 as mineraliser and borax as dopant agent to stabilize alpha forms of belite phase. After that, anhydrite was added as sulphate source to obtain the corresponding cements. The hydration behaviour of these cements has been studied through rheological and x-ray diffraction measurements, the latter combined with Rietveld quantitative phase analysis. In addition, mechanical and dimensional properties of BAY mortars are also presented and discussed.Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech

Aplicación del programa: “Nutriéndose adecuadamente para mejorar el estado nutricional de las alumnas de educación inicial de la Universidad César Vallejo de Piura III ciclo”

La presente investigación desarrolla las características básicas de la orientación educativa y las estrategias de nutrición saludable, lo cual ha permitido sustentar las bases para la elaboración de un programa educativo “Nutriéndonos Adecuadamente”, es una investigación con diseño de tipo cuasi-experimental. Esta investigación permitió mejorar el estado nutricional de las alumnas de Educación Inicial de la Universidad César Vallejo de Piura III Ciclo”. Se hipotetiza que la aplicación del programa nutricional mejora significativamente el estado nutricional de las alumnas de Educación Inicial de la Universidad César Vallejo de Piura III Ciclo. En esta investigación se busca la unidad metodológica desde el planteamiento de la matriz de consistencia, el sistema de hipótesis, la dimensionalidad de las variables, los mismos que guardan una relación significativa con el trabajo de nuestro marco teórico. En el trabajo se utilizó como instrumento: prueba de conocimientos. La muestra para nuestro trabajo estuvo constituida por el total de 30 alumnas, de los cuales 15 alumnas conformaron el grupo experimental y 15 alumnas el grupo control. A dicha muestra se le aplicó una prueba de conocimientos que tuvo la condición de pre-test y post-test. Dicha prueba fue sometida a valides de contenido por criterio de juicio de expertos y luego para establecer la confiabilidad se utilizó la prueba de confiabilidad de Kuder-Richardson 20. Para la prueba de normalidad se utilizó la prueba de Kolmogorov-Smirnov y en la prueba de hipótesis se consideró la prueba estadística paramétrica t de Students para muestras independientes y para muestras relacionadas.Universidad Nacional de Educación Enrique Guzmán y Valle. Escuela de Posgrado.Tesi

Rietveld Quantitative Phase Analysis of Oil Well Cement: in Situ Hydration Study at 150 Bars and 150 °C

Oil and gas well cements are multimineral materials that hydrate under high pressure and temperature. Their overall reactivity at early ages is studied by a number of techniques including through the use of the consistometer. However, for a proper understanding of the performance of these cements in the field, the reactivity of every component, in real‐world conditions, must be analysed. To date, in situ high energy synchrotron powder diffraction studies of hydrating oil well cement pastes have been carried out, but the quality of the data was not appropriated for Rietveld quantitative phase analyses. Therefore, the phase reactivities were followed by the inspection of the evolution of non‐overlapped diffraction peaks. Very recently, we have developed a new cell specially designed to rotate under high pressure and temperature. Here, this spinning capillary cell is used for in situ studies of the hydration of a commercial oil well cement paste at 150 bars and 150 °C. The powder diffraction data were analysed by the Rietveld method to quantitatively determine the reactivities of each component phase. The reaction degree of alite was 90% after 7 hours, and that of belite was 42% at 14 hours. These analyses are accurate, as the in situ measured crystalline portlandite content at the end of the experiment, 12.9 wt%, compares relatively well with the value determined ex situ by thermal analysis, i.e., 14.0 wt%. The crystalline calcium silicates forming at 150 bars and 150 °C are also discussed.This research was funded by Spanish MINECO, grant number BIA2017‐82391‐R which is co‐funded by FEDER. We thank Marc Malfois for his help during the experiment performed at NCD‐SWEET beamline at ALBA synchrotron. We also thank Marcus Paul (Dyckerhoff GmbH) for providing the OWC sample with its characterization and helpful discussions

Numerically Calculated 3-D Space-Weighting Functions to Image Crustal Volcanic Structures Using Diffuse Coda Waves

Acknowledgments: This research was partly supported by the Projects TEC2015-68752 (MINECO/FEDER), TEC2015-68752 (KNOWAVES).Peer reviewedPublisher PD

The UNIVERSIA/UPM OPEN COURSEWARE iniciative to share the knowledge

This paper shows the most innovative aspects of the Universia/UPM OpenCourseWare (OCW) project referred to globalization of higher education in a Latin-American environment and the sharing of knowledge. The MIT idea of offering, through Internet, the available educational resources in an open way has been spread all over the world and many Universities and Institutions have joint this initiative. Universia, Institution which gathers one of the biggest world universities net, has launched an OCW site, with the technical collaboration of the Technical University of Madrid (UPM) who is working as the main university project promoter. The OCW-Universia site has one of the greatest growth rates at present and is facing new challenges and developments which will allow its expansion as a reference within an international context

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]

Feminist contributions on sexual experiences of women with serious mental illness: a literature review

This paper aims to explore the contributions of research that include gender perspective in analysing the sexual experiences of women diagnosed with serious mental illness and to identify any barriers and systems that impede sexual fulfilment. We have developed a qualitative literature review using the PRISMA statement. The databases SCOPUS, WOS and PsychINFO were used in this review. Studies were included if they were published up to March 15, 2022, and only studies in English were included. An initial database search was preformed; upon screening for eligibility, there remained 16 studies that explored the sexual experiences of women with diagnoses of serious mental illness. The studies were analysed by a thematic synthesis. Data was coded line-by-line which generated descriptive themes, resulting in four synthesised findings. The four synthesised findings that derived from the reviewed studies were stigma and subjectivity, the experience of interpersonal relationships, the socialisation of women and the effects of psychiatric hegemony. A feminist perspective highlights the interrelationship between gender and stigma as it relates to serious mental illness and sexuality. A feminist perspective and an intersectional approach should be adopted at the intersubjective and structural level to account for the complexity of human experience and to subvert the heteropatriarchal system

Water-to-cement ratio influence on low-carbon cements performances

Portland Cement (PC) is the most important active ingredient in most of the construction concrete. However, the PC production is associated with a high carbon dioxide release (around 1 ton of CO2 per ton of PC). One approach to reduce CO2 emissions consists on the reformulation of the clinker with less calcite demanding phases, such as, belite rich clinkers. The drawback of this kind of clinkers is the low reactivity of belite (beta-belite). In order to compensate this problem, belite rich clinkers can be prepared with ye’elimite and ferrite or with alite [known as belite-ye’elimite-ferrite (BYF) and belite-alite-ye’elimite (BAY), respectively]. In addition, it can be improved by using a high reactive belite polymorph, such as alpha-belite. In this work, the hydration and mechanical behaviour of BYF and BAY cements (with beta and/or alpha-belite) with different water-to-cement ratios have been studied. The clinkers were produced using natural raw materials, and were mixed with anhydrite (CaSO4) to prepare the corresponding cements. At early ages, the main hydration products of these cements were ettringite, calcium monosulfoaluminate and amorphous aluminium hydroxide. At later ages, stratlingite, katoite and amorphous C-S-H were found. The compressive strength values of the corresponding mortars were correlated with the mineralogy evolution of the pastes (mainly obtained by XRD and TGA).Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech. I3-Ramón y Cajal Universidad de Malag

Identification and genomic characterization of a novel tobamovirus from prickly pear cactus

[EN] In this work, we describe the complete sequence and genome organization of a novel tobamovirus detected in a prickly pear plant (Opuntia sp.) by high-throughput sequencing, tentatively named "opuntia virus 2". The full genome of opuntia virus 2 is 6,453 nucleotides in length and contains four open reading frames (ORFs) coding for the two subunits of the RNA polymerase, the movement protein, and the coat protein, respectively. Phylogenetic analysis using the complete nucleotide sequence revealed that the virus belongs to the genus Tobamovirus (family Virgaviridae), showing the highest nucleotide sequence identity (49.8%) with cactus mild mottle virus (CMMoV), being indicating that it belongs in the Cactaceae subgroup of tobamoviruses.This study was funded by project no. IN216317 of UNAM-Programa de Apoyo a Proyectos de Investigacion e Innovacion Tecnologica (PAPIIT) and by Grant BIO2017-88321-R from the Spanish Agencia Estatal de Investigacion (AEI) and Fondo Europeo de Desarrollo Regional (FEDER).Salgado-Ortiz, H.; De La Torre-Almaraz, R.; Sanchez Navarro, JA.; Pallás Benet, V. (2020). Identification and genomic characterization of a novel tobamovirus from prickly pear cactus. Archives of Virology. 165(3):781-784. https://doi.org/10.1007/s00705-020-04528-3S7817841653Sánchez LDL, López GC, Ávalos HI (2013) Nomenclatura vernácula, uso y manejo de Opuntia spp. en Santiago Bayacora, Durango, México. Revista Chapingo Serie Horticultura 19:367–380Alonso BB, Mora AG, Valdovinos PG, Ochoa MDL, Rodríguez LE, De La Torre AR (2015) Asociación de un Potexvirus como agente causal de manchas cloróticas en Opuntia ficus-indica. Rev Mex Fitopatol 33:75–86De La Torre AR, Salgado OH, Salazar SM, Pallás V, Sánchez NJA, Valverde RA (2016) First report of Schlumbergera virus X in prickly pear (Opuntia ficus-indica) in Mexico. Plant Dis 100(8):1799De La Torre AR, Salgado OH, Salazar SM, Pallás V, Sánchez NJA, Valverde RA (2016) First report of Rattail cactus necrosis-associated virus in prickly pear fruit (Opuntia albicarpa Scheinvar) in Mexico. Plant Dis 100(11):2339Min BE, Chung BN, Kim MJ, Ha JH, Lee BY, Ryu KH (2006) Cactus mild mottle virus is a new cactus-infecting tobamovirus. Arch Virol 151(1):13–21Kim NR, Hong JS, Song YS, Chung BN, Park JW, Ryu KH (2012) The complete genome sequence of a member of a new species of tobamovirus (rattail cactus necrosis-associated virus) isolated from Aporocactus flagelliformis. Arch Virol 157(1):185–187Adams MJ, Antoniw JF, Kreuze J (2009) Virgaviridae: a new family of rod-shaped plant viruses. Arch Virol 154(12):1967–1972. https://doi.org/10.1007/s00705-009-0506-6Lecoq H, Desbiez C (2012) Viruses of cucurbit crops in the Mediterranean region: an ever-changing picture. Adv Virus Res 84:67–126Haas BJ, Papanicolaou A, Yassour M, Grabherr M, Blood PD, Bowden J, Regev A (2013) De novo transcript sequence reconstruction from RNA-Seq: reference generation and analysis with Trinity. Nat Protoc 8(8):1–43Altschul SF, Madden TL, Schäffer AA, Zhang J, Zhang Z, Miller W, Lipman DJ (1997) Gapped BLAST and PSI-BLAST: a new generation of protein database search programs. Nucleic Acids Res 25:3389–3402Kumar S, Stecher G, Tamura K (2016) MEGA7: molecular evolutionary genetics analysis version 7.0 for bigger datasets. Mol Biol Evol 33(7):1870–1874Song YS, Min BE, Hong JS, Rhie MJ, Kim MJ, Ryu KH (2006) Molecular evidence supporting the confirmation of Maracuja mosaic virus as a species of the genus Tobamovirus and production of an infectious cDNA transcript. Arch Virol 151:2337–2348Gibbs AJ, Wood J, Garcia-Arenal F, Ohshima K, Armstrong JS (2015) Tobamoviruses have probably co-diverged with their eudicotyledonous hosts for at least 110 million years. Virus Evol 1(1):vev019Adams MJ, Adkins S, Blagard C et al (2018) International Committee on Taxonomy of Viruses (ICTV) Report on the taxonomy of the Virgaviridae. http://www.ictv.global/report/virgaviridae. Accessed 19 Oct 201