11 research outputs found
Modélisation de la fissuration lente d\u27une céramique technique de type ferrite
No full textMême s\u27ils ont été moins étudiés, les ferrites sont sensibles à la rupture différée dans le temps. Le processus de fissuration lente est caractérisé par une vitesse de propagation de fissure V qui augmente avec le niveau de chargement appliqué KI, De plus, la fissuration lente caractérisée par des courbes V-K est dépendante de la microstructure, notamment de la taille de grain, voire de la présence de défauts comme des porosités aux points triples. Les ferrites auxquels nous nous intéressons possèdent une microstructure hétérogène vis à vis de la taille des grains, avec des pores aux points triples. Une telle microstructure conduit à une dispersion des mesures de fissuration lente V-K telle, qu\u27aucune prédictions fiables de durée de vie est possible à partir d\u27études expérimentales uniquement. Le recours à la simulation s\u27avère nécessaire à la fois pour élucider l\u27influence de la microstructure sur la rupture différée dans le temps et in fine pour estimer la durabilité du matériau. Nous avons développé une description locale de la fissuration lente, à l\u27échelle de la microstructure. Dans le cadre d\u27une méthodologie des zones cohésives, à partir des observations et descriptions physico-chimiques disponibles et de calculs atomistiques récents, nous proposons un modèle cohésif viscoplastique pour mimer le mécanisme de réaction-rupture responsable de la fissuration lente. La description permet d\u27estimer des variations V-K conformes aux observations. Dans les simulations de la rupture intergranulaire des polycristaux pour un chargement de fatigue statique, nous observons que l\u27avancée de la fissure est discontinue dans le temps avec des vitesses différentes selon l\u27orientation des grains. Le franchissement des points triples ralentit la progression de la fissure. Nous montrons qu\u27il est nécessaire de tenir compte des contraintes d\u27origine thermique pour prédire une influence de la taille des grains
Sectoral multipole focused beams
No full textAn OSA-formatted open access journal article PDF may be governed by the OSA Open Access Publishing Agreement signed by the author and any applicable copyright laws. Authors and readers may use, reuse, and build upon the article, or use it for text or data mining without asking prior permission from the publisher or the Author(s), as long as the purpose is non-commercial and appropriate attribution is maintainedWe discuss the properties of pure multipole beams with well-defined handedness or helicity, with the beam field a simultaneous eigenvector of the squared total angular momentum and its projection along the propagation axis. Under the condition of hemispherical illumination, we show that the only possible propagating multipole beams are "sectoral" multipoles. The sectoral dipole beam is shown to be equivalent to the non-singular time-reversed field of an electric and a magnetic point dipole Huygens' source located at the beam focus. Higher order multipolar beams are vortex beams vanishing on the propagation axis. The simple analytical expressions of the electric field of sectoral multipole beams, exact solutions of Maxwell's equations, and the peculiar behaviour of the Poynting vector and spin and orbital angular momenta in the focal volume could help to understand and model light-matter interactions under strongly focused beamsSpanish Ministerio de Economía y Competitividad (MICINN) and European Regional Development Fund (ERDF) (FIS2015-69295-C3-3-P); Basque Dep. de Educación (PI-2016-1-0041) and PhD Fellowship (PRE-2018-2-0252
In-situ observations of a martensitic transformation in a CuZnAl single crystal driven by stress or strain
No full textInternational audienc
In-situ observations of a martensitic transformation in a CuZnAl single crystal driven by stress or strain
No full textInternational audienc
In-situ observations of a martensitic transformation in a CuZnAl single crystal driven by stress or strain
No full textInternational audienc
Relación entre las habilidades blandas y el clima organizacional de los trabajadores del área táctica y operática de la clínica cardiovascular angiografías del llano
No full textLa presente investigación tuvo como objetivo establecer la relación entre las habilidades blandas y el clima organizacional de los trabajadores del área táctica y operativa de la Clínica Angiografías del Llano, para el desarrollo de esta investigación cuantitativa, se empleó el diseño no experimental de tipo transversal y alcance correlacional. La muestra poblacional de esta investigación fue de 111 trabajadores de la Clínica Angiografías del Llano, de los cuales, 52 de ellos pertenecían al área táctica y 59 al área operativa de dicha empresa. Con el fin de medir las variables establecidas en esta investigación, se utilizó el instrumento Clima en Organizaciones Colombianas (IMCOC) y el Cuestionario de Habilidades Blandas. Ahora bien, se utilizó el coeficiente de correlación Spearman con el fin de analizar los resultados y encontrar la relación entre las variables y sus subescalas. Los resultados del estadístico correlacional para datos no paramétricos arrojaron un Sig. ,640 y un coeficiente de relación inexistente (,45), lo que quiere decir que no hay relación estadísticamente significativa entre las variables habilidades blandas y clima organizacional de los trabajadores del área táctica y operativa de la Clínica Cardiovascular Angiografías del Llano. Por lo que se concluye que para la muestra en cuestión se pueden presentar las variables de manera independiente. De modo que, con el propósito de aportar al problema de conocimiento se sugieren desarrollar investigaciones que tomen las mismas variables con una muestra más variada y amplia.
Palabras clave: Clima organizacional, habilidades blandas, psicología, cuantitativo.The present research aimed to establish the relationship between soft skills and organizational climate of workers in the tactical and operational area of the Clinica Angiografias de llano, for the development of this quantitative research, the non-experimental design of cross-sectional type and correlational scope was used. The population sample of this research was 111 workers of the Angiographies Clinic of Llano, of which 52 of them belonged to the tactical area and 59 to the operational area of this company. In order to measure the variables established in this research, the Climate in Colombian Organizations (IMCOC) instrument and the Soft Skills Questionnaire were used. However, the Spearman correlation coefficient was used in order to analyze the results and find the relationship between the variables and their subscales. The results of the correlational statistic for non-parametric data yielded a GIS. ,640 and a non-existent relationship coefficient (,45), which means that there is no statistically significant relationship between the variables soft skills and organizational climate of workers in the tactical and operational area of the Clinica cardiovascular Angiografia del llano. Therefore, it is concluded that for the sample in question the variables can be presented independently. So, in order to contribute to the problem of knowledge, it is suggested to develop research that takes the same variables with a more varied and broad sample.
Keywords: Organizational climate, soft skills, psychology, quantitative.Psicólogohttp://www.ustavillavicencio.edu.co/home/index.php/unidades/extension-y-proyeccion/investigacionPregrad
Multiaxial mechanical behavior of aramid fibers and identification of skin/core structure from single fiber transverse compression testing
No full textInternational audienceThe transverse and longitudinal mechanical properties of aramid fibers like Kevlar™ 29 (K29) fibers are strongly linked to their highly oriented structure. Mechanical characterization at the single fiber scale is challenging especially when the diameter is as small as 15 µm. Longitudinal tensile tests on single K29 fibers and single fiber transverse compression test (SFTCT) have been developed. Our approach consists of coupling morphological observations and mechanical experiments with SFTCT analysis by comparing analytical solutions and finite element modeling. New insights on the analysis of the transverse direction response are highlighted. Systematic loading/unloading compression tests enable to experimentally determine a transverse elastic limit. Taking account of the strong anisotropy of the fiber, the transverse mechanical response sheds light on a skin/core architecture. More importantly, results suggest that the skin of the fiber, typically representing a shell of one micrometer in thickness, has a transverse apparent modulus of 0.2 GPa. That is around more than fifteen times lower than the transverse modulus of 3.0 GPa in the core. By comparison, the measured longitudinal modulus is about 84 GPa. The stress distribution in the fiber is explored and the critical areas for damage initiation are discussed
Evaluación de políticas de eficiencia energética en instituciones educativas de la ciudad de Barranquilla con dinámica de sistemas
No full textA nivel mundial, las políticas de eficiencia energética son una herramienta esencial para contribuir a la reducción de emisiones de CO2 e inestabilidad del sistema climático, contribuyendo a la seguridad del suministro y mitigando el agotamiento de los recursos energéticos. Aunque muchos países de la Organización para la Cooperación y Desarrollo Económico (OCDE) cuentan con políticas maduras de eficiencia energética, la gran mayoría de los países en desarrollo todavía están en proceso de implementar códigos, estándares y regulaciones para este propósito. En efecto, la siguiente propuesta de investigación, centra su objetivo en el desarrollo de un modelo de simulación con dinámica de sistemas que permita evaluar políticas nacionales de eficiencia energética en instituciones educativas de la ciudad de Barranquilla. Para esto, se plantea la necesidad de revisar políticas de eficiencia energética que se adapten al sistema de estudio y evaluar su efectividad en términos de reducción de consumo energético, a través de análisis de escenarios en el modelo propuesto.Globally, energy efficiency policies are an essential tool to contribute to the reduction of CO2 emissions and the instability of the climate system, contributing to security of supply and mitigating the depletion of energy resources. While many countries of the Organization for Economic Cooperation and Development (OECD) have mature energy efficiency policies, most developing countries are still in the process of implementing codes, standards, and regulations for this purpose. In effect, the following research proposal focuses it´s objective on the development of a simulation model with systems dynamics that allows evaluating the national energy efficiency policies in the educational institutions of the city of Barranquilla. For this, it´s necessary to review the energy efficiency policies that are adapted to the study system and evaluate their effectiveness in terms of reducing energy consumption, by analyzing scenarios in the proposed model.Introducción 11 -- Planteamiento del problema 13 -- Objetivos 19 -- General 19 -- Específicos 19 -- Marco teórico 20 -- Eficiencia Energética 20 -- Políticas de Eficiencia Energética 21 -- Dinámica de Sistemas 24 -- Sectores de consumo energético en Colombia 27 -- Estado del arte 29 -- Justificación 39 -- Alcance y limitaciones 41 -- Limitaciones 41 -- Diseño metodológico 42 -- Identificación de políticas nacionales 44 -- Desarrollo hipótesis dinámica 45 -- Construcción y validación del modelo de simulación 51 -- Escenario actual 55 -- Escenario consumo Iluminarias 55 -- Escenario consumo Aires 56 -- Escenario consumo Ventiladores 57 -- Escenario consumo Computadores 59 -- Análisis de escenarios 61 -- Escenarios 1: Cambio de Iluminarias 61 -- Escenarios 2: Cambio de Electrodomésticos (aire y ventiladores) 64 -- Escenarios 3: Utilización de paneles solares 67 -- Conclusiones 71 -- Bibliografía 73Magíster en IngenieríaMaestrí
Childhood in the works of Silvina Ocampo and Alejandra Pizarnik
No full textThis thesis
explores childhood as
theme
and perspective
in
the Argentine
cuentista and
poet
Silvina Ocampo (1903-1993)
and traces this thematic
and vital
link to the
Argentine
poet
Alejandra Pizamik (1936-1972). The
study
looks
at childhood not only
in
relation to their literary texts but
also
in the
writers' construction of self-identity
within
their
socio-literary context, and at
the
role played
by
visual art
in their
aesthetic.
Chapter 1
contrasts Silvina
with
her
elder sister
Victoria Ocampo through their
differing literary
appropriation of a shared childhood. It distinguishes Ocampo from
Adolfo Bioy Casares and
Jorge Luis Borges in terms of
her fictional logic
and
her
treatment of games, drawing comparisons instead with Julio Cortdzar.
Chapter 2
undertakes close reading of various Ocampo texts, including
some
for
children,
in
order to explore
her
vision of childhood through nostalgia, adult-child
power relationships, aging and rejuvenation, and moments of
initiation or
imitation.
Chapter 3
turns to Pizarnik
and the myth of the child-poet.
It
analyses
her
child
personae through Andre Breton's Surrealism, Jean Cocteau
and
Octavio Paz, through
her borrowings from Alice in Wonderland
and
Nadja,
and
through
her
obsession with
madness, death,
orphanhood, violation and transgression.
Chapter 4 is
comparative.
It
outlines the context
in
which
Ocampo
and
Pizamik's
passionate friendship developed,
and considers
Pizamik's
essay on
Elpecado
mortal.
It
then explores their broad
mutual
literary
and
thematic
affinities.
My
conclusion is that Ocampo's works achieve equilibrium between childhood and age,
whereas Pizarnik's
much-discussed poetic crisis of exile
from language itself
parallels
her deep sense of anxiety at being
exiled from the world of childhood.
This thesis
contributes to the
study of
Argentine literature by drawing
revealing
comparisons
between
two key
writers
through their shared obsession with childhood,
arguing that
an understanding of their attitudes
to childhood
is fundamental
to
appreciating
fully their
work.
I
refer to unpublished
letters
of
Ocampo,
material
from
private
interviews,
photographs and relevant paintings
by Leonor Fini, Alicia Carletti
and others
Detailed stratified GWAS analysis for severe COVID-19 in four European populations
No full textGiven the highly variable clinical phenotype of Coronavirus disease 2019 (COVID-19), a deeper analysis of the host genetic contribution to severe COVID-19 is important to improve our understanding of underlying disease mechanisms. Here, we describe an extended GWAS meta-analysis of a well-characterized cohort of 3,260 COVID-19 patients with respiratory failure and 12,483 population controls from Italy, Spain, Norway and Germany/Austria, including stratified analyses based on age, sex and disease severity, as well as targeted analyses of chromosome Y haplotypes, the human leukocyte antigen (HLA) region and the SARS-CoV-2 peptidome. By inversion imputation, we traced a reported association at 17q21.31 to a highly pleiotropic ∼0.9-Mb inversion polymorphism and characterized the potential effects of the inversion in detail. Our data, together with the 5th release of summary statistics from the COVID-19 Host Genetics Initiative, also identified a new locus at 19q13.33, including NAPSA, a gene which is expressed primarily in alveolar cells responsible for gas exchange in the lung.Andre Franke and David Ellinghaus were supported by a grant from the German
Federal Ministry of Education and Research (01KI20197), Andre Franke, David
Ellinghaus and Frauke Degenhardt were supported by the Deutsche
Forschungsgemeinschaft Cluster of Excellence “Precision Medicine in Chronic
Inflammation” (EXC2167). David Ellinghaus was supported by the German Federal
Ministry of Education and Research (BMBF) within the framework of the
Computational Life Sciences funding concept (CompLS grant 031L0165). David
Ellinghaus, Karina Banasik and Søren Brunak acknowledge the Novo Nordisk
Foundation (grant NNF14CC0001 and NNF17OC0027594). Tobias L. Lenz, Ana
Teles and Onur Özer were funded by the Deutsche Forschungsgemeinschaft (DFG,
German Research Foundation), project numbers 279645989; 433116033; 437857095. Mareike Wendorff and Hesham ElAbd are supported by the German
Research Foundation (DFG) through the Research Training Group 1743, "Genes,
Environment and Inflammation". This project was supported by a Covid-19 grant from
the German Federal Ministry of Education and Research (BMBF; ID: 01KI20197).
Luca Valenti received funding from: Ricerca Finalizzata Ministero della Salute RF2016-02364358, Italian Ministry of Health ""CV PREVITAL – strategie di prevenzione
primaria cardiovascolare primaria nella popolazione italiana; The European Union
(EU) Programme Horizon 2020 (under grant agreement No. 777377) for the project
LITMUS- and for the project ""REVEAL""; Fondazione IRCCS Ca' Granda ""Ricerca
corrente"", Fondazione Sviluppo Ca' Granda ""Liver-BIBLE"" (PR-0391), Fondazione
IRCCS Ca' Granda ""5permille"" ""COVID-19 Biobank"" (RC100017A). Andrea Biondi
was supported by the grant from Fondazione Cariplo to Fondazione Tettamanti: "Biobanking of Covid-19 patient samples to support national and international research
(Covid-Bank). This research was partly funded by a MIUR grant to the Department of
Medical Sciences, under the program "Dipartimenti di Eccellenza 2018–2022". This
study makes use of data generated by the GCAT-Genomes for Life. Cohort study of
the Genomes of Catalonia, Fundació IGTP. IGTP is part of the CERCA Program /
Generalitat de Catalunya. GCAT is supported by Acción de Dinamización del ISCIIIMINECO and the Ministry of Health of the Generalitat of Catalunya (ADE 10/00026);
the Agència de Gestió d’Ajuts Universitaris i de Recerca (AGAUR) (2017-SGR 529).
Marta Marquié received research funding from ant PI19/00335 Acción Estratégica en
Salud, integrated in the Spanish National RDI Plan and financed by ISCIIISubdirección General de Evaluación and the Fondo Europeo de Desarrollo Regional
(FEDER-Una manera de hacer Europa").Beatriz Cortes is supported by national
grants PI18/01512. Xavier Farre is supported by VEIS project (001-P-001647) (cofunded by European Regional Development Fund (ERDF), “A way to build Europe”).
Additional data included in this study was obtained in part by the COVICAT Study
Group (Cohort Covid de Catalunya) supported by IsGlobal and IGTP, EIT COVID-19
Rapid Response activity 73A and SR20-01024 La Caixa Foundation. Antonio Julià
and Sara Marsal were supported by the Spanish Ministry of Economy and
Competitiveness (grant numbers: PSE-010000-2006-6 and IPT-010000-2010-36).
Antonio Julià was also supported the by national grant PI17/00019 from the Acción
Estratégica en Salud (ISCIII) and the FEDER. The Basque Biobank is a hospitalrelated platform that also involves all Osakidetza health centres, the Basque government's Department of Health and Onkologikoa, is operated by the Basque
Foundation for Health Innovation and Research-BIOEF. Mario Cáceres received
Grants BFU2016-77244-R and PID2019-107836RB-I00 funded by the Agencia Estatal
de Investigación (AEI, Spain) and the European Regional Development Fund
(FEDER, EU). Manuel Romero Gómez, Javier Ampuero Herrojo, Rocío Gallego Durán
and Douglas Maya Miles are supported by the “Spanish Ministry of Economy,
Innovation and Competition, the Instituto de Salud Carlos III” (PI19/01404,
PI16/01842, PI19/00589, PI17/00535 and GLD19/00100), and by the Andalussian
government (Proyectos Estratégicos-Fondos Feder PE-0451-2018, COVID-Premed,
COVID GWAs). The position held by Itziar de Rojas Salarich is funded by grant
FI20/00215, PFIS Contratos Predoctorales de Formación en Investigación en Salud.
Enrique Calderón's team is supported by CIBER of Epidemiology and Public Health
(CIBERESP), "Instituto de Salud Carlos III". Jan Cato Holter reports grants from
Research Council of Norway grant no 312780 during the conduct of the study. Dr.
Solligård: reports grants from Research Council of Norway grant no 312769. The
BioMaterialBank Nord is supported by the German Center for Lung Research (DZL),
Airway Research Center North (ARCN). The BioMaterialBank Nord is member of
popgen 2.0 network (P2N). Philipp Koehler has received non-financial scientific grants
from Miltenyi Biotec GmbH, Bergisch Gladbach, Germany, and the Cologne
Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases,
University of Cologne, Cologne, Germany. He is supported by the German Federal
Ministry of Education and Research (BMBF).Oliver A. Cornely is supported by the
German Federal Ministry of Research and Education and is funded by the Deutsche
Forschungsgemeinschaft (DFG, German Research Foundation) under Germany's
Excellence Strategy – CECAD, EXC 2030 – 390661388. The COMRI cohort is funded
by Technical University of Munich, Munich, Germany. Genotyping was performed by
the Genotyping laboratory of Institute for Molecular Medicine Finland FIMM
Technology Centre, University of Helsinki. This work was supported by grants of the
Rolf M. Schwiete Stiftung, the Saarland University, BMBF and The States of Saarland
and Lower Saxony. Kerstin U. Ludwig is supported by the German Research
Foundation (DFG, LU-1944/3-1). Genotyping for the BoSCO study is funded by the
Institute of Human Genetics, University Hospital Bonn. Frank Hanses was supported
by the Bavarian State Ministry for Science and Arts. Part of the genotyping was
supported by a grant to Alfredo Ramirez from the German Federal Ministry of Education and Research (BMBF, grant: 01ED1619A, European Alzheimer DNA
BioBank, EADB) within the context of the EU Joint Programme – Neurodegenerative
Disease Research (JPND). Additional funding was derived from the German Research
Foundation (DFG) grant: RA 1971/6-1 to Alfredo Ramirez. Philip Rosenstiel is
supported by the DFG (CCGA Sequencing Centre and DFG ExC2167 PMI and by SH
state funds for COVID19 research). Florian Tran is supported by the Clinician Scientist
Program of the Deutsche Forschungsgemeinschaft Cluster of Excellence “Precision
Medicine in Chronic Inflammation” (EXC2167). Christoph Lange and Jan Heyckendorf
are supported by the German Center for Infection Research (DZIF). Thorsen Brenner,
Marc M Berger, Oliver Witzke und Anke Hinney are supported by the Stiftung
Universitätsmedizin Essen. Marialbert Acosta-Herrera was supported by Juan de la
Cierva Incorporacion program, grant IJC2018-035131-I funded by
MCIN/AEI/10.13039/501100011033. Eva C Schulte is supported by the Deutsche
Forschungsgemeinschaft (DFG; SCHU 2419/2-1).N
