Particle Size Inversion from Spectrally Resolved Full-Field Forward Scattering

[EN] Ensemble particle sizing has traditionally relied on inversion of extinction measurements for the characterization of the particle size distribution (PSD) in particulate media. However, particulate media induce complex phase changes that contain valuable information about their structure. Here, we propose the use of coherent detection to derive particle size distributions in inhomogeneous samples from light scattering. This is achieved by exploiting THz waves, which allow for both extinction and refractive index information to be directly retrieved. A modified version of the iterative Twomey method is presented in order to take into account this information. Additionally, by using a forward model based on the Waterman-Truell formula for the complex refractive index, samples with absorption in both the matrix medium and the particulate phase can be measured. The inversion needs neither a priori assumptions nor constraints regarding the PSD shape. Numerical simulations show that this full-field approach reduces the error of the inversion process potentially up to 65% compared with inversion using only extinction data. Experimental validation of the technique is provided by measuring calibrated spherical glass particles inside a PTFE matrix and retrieving the PSD in the case of monodisperse and polydisperse samples showing an enhancement of up to 32% in comparison to inversion from extinction data.This work was supported in part by the Spanish Ministerio de Ciencia e Innovacion-Agencia Estatal de Investigacion under project PID2019-111339GBI00.Báez-Chorro, MÁ.; Vidal Rodriguez, B. (2023). Particle Size Inversion from Spectrally Resolved Full-Field Forward Scattering. Analytical Chemistry. 95(43):15994-16003. https://doi.org/10.1021/acs.analchem.3c031781599416003954

Familia y Tercera Edad: variables predictoras del abandono del anciano

Resumo: Neste artigo abordaremos a problemática dos idosos em uma sociedade na qual é cada vez maior o número de pessoas com idade superior a 65 anos. Uma das conseqüências do aumento da média de idade e de uma maior qualidade de vida dos idosos é, precisamente, a não existência de pessoas que os assumam. Estudaremos, nestas linhas, o risco de abandono e quais são as variáveis mais importantes na predição deste risco. Para tanto trabalharemos com dois grupos de idosos (os que vivem em casa com seus familiares e os que vivem em residências para idosos), o que totaliza 121 idosos e, mediante a técnica estatística da regressão logística obteremos as variáveis com maior peso para discriminar entre os dois grupos e predizer o risco de abandono. Palavras-chave: Idoso. Abandono. Família. Abstract: This paper approaches the problem of the elderly in a society of a growing number of people who are more than 65 years old. One of the consequences of a higher average age and a better quality of life of the elderly is, precisely, the lack of people who assume them. Following these lines, this study concerns the risk of abandonment and the most important variables in the prediction of this risk. Two elderly groups (those that live at home with their families and those that live in rest homes) of a total of 121 elders is the studied population. By means of the statistics technique of logistic regression, the variables with greater influence to discriminate between the two groups and predict the risk of abandonment were obtained. Keywords: Elderly. Abandonment. Family

Interacción de la IgM humana con la proteína A de Staphylococcus Aureus : bases estructurales de la reactividad alternativa de inmunoglobulinas con proteína A

Tesis inédita de la Universidad Complutense de Madrid, Facultad de Ciencias Biológicas, leída en 1984.Fac. de Ciencias BiológicasTRUEProQuestpu

Arquitectura religiosa e ideología a partir del Concilio Vaticano II en la periferia urbana de Lima: El caso Lima Norte

This paper asks how religious architecture in the urban periphery of Lima, acquires an expression in line with Vatican II? Cities like Lima overwhelmed by the provincial immigrants living in urban peripheries, will be the scene in which the actors of the new districts built their new parishes. In this areas, cultural, ideological, political and social factors, together with the liturgical changes, will condition the religious architecture, his messages and meanings. This research seeks to establish as Second Vatican Council and ideologies of the late twentieth century in Lima Norte, determine the expression of the religious architecture, displaying their close relationship with theology, ecclesiology and liturgy; pastoral missions; marxism; the ecumenical spirit —christians of other faiths; Cultural and Popular Churches; the postmodernism; and liberationist and developmentalist discourses.Esta ponencia se pregunta: ¿cómo la arquitectura religiosa de la periferia urbana de Lima adquiere una expresión en correspondencia con el Concilio Vaticano II? Las ciudades desbordadas por los inmigrantes provincianos que habitan en sus periferias, como Lima, son el escenario en el que los actores de los nuevos distritos construyen sus nuevas parroquias. En este ámbito, los factores culturales, ideológicos, políticos y sociales, junto a los cambios litúrgicos, condicionarán a la arquitectura eclesial, sus mensajes y significados. Esta investigación busca explicar cómo el Concilio Vaticano II y las ideologías de la segunda mitad del siglo XX condicionan la expresión del edificio eclesial en Lima Norte, visualizando su estrecha relación con la teología, la eclesiología y la liturgia; las misiones y pastorales; el marxismo; el espíritu ecuménico (los cristianos de otras religiones); la Iglesia cultural y la popular; la postmodernidad; y los discursos liberador y desarrollista

Interacción de la IgM humana con la proteína A de Staphylococcus Aureus : bases estructurales de la reactividad alternativa de inmunoglobulinas con proteína A

Tesis inédita de la Universidad Complutense de Madrid, Facultad de Ciencias Biológicas, leída en 1984.Fac. de Ciencias BiológicasTRUEProQuestpu

Religious architecture and ideology from Vatican Council II in the urban periphery of Lima: the Case North Lima

[Resumen] Esta ponencia se pregunta: ¿cómo la arquitectura religiosa de la periferia urbana de Lima adquiere una expresión en correspondencia con el Concilio Vaticano II? Las ciudades desbordadas por los inmigrantes provincianos que habitan en sus periferias, como Lima, son el escenario en el que los actores de los nuevos distritos construyen sus nuevas parroquias. En este ámbito, los factores culturales, ideológicos, políticos y sociales, junto a los cambios litúrgicos, condicionarán a la arquitectura eclesial, sus mensajes y significados. Esta investigación busca explicar cómo el Concilio Vaticano II y las ideologías de la segunda mitad del siglo XX condicionan la expresión del edificio eclesial en Lima Norte, visualizando su estrecha relación con la teología, la eclesiología y la liturgia; las misiones y pastorales; el marxismo; el espíritu ecuménico (los cristianos de otras religiones); la Iglesia cultural y la popular; la postmodernidad; y los discursos liberador y desarrollista.[Abstract] This paper asks how religious architecture in the urban periphery of Lima, acquires an expression in line with Vatican II? Cities like Lima overwhelmed by the provincial immigrants living in urban peripheries, will be the scene in which the actors of the new districts built their new parishes. In this areas, cultural, ideological, political and social factors, together with the liturgical changes, will condition the religious architecture, his messages and meanings. This research seeks to establish as Second Vatican Council and ideologies of the late twentieth century in Lima Norte, determine the expression of the religious architecture, displaying their close relationship with theology, ecclesiology and liturgy; pastoral missions; marxism; the ecumenical spirit —christians of other faiths; Cultural and Popular Churches; the postmodernism; and liberationist and developmentalist discourses

Metal applications of liquid-phase microextraction

This review focuses on the combination of elemental detection techniques with liquid-phase microextraction (LPME), namely, single drop microextraction, hollow fiber based liquid-phase microextraction, dispersive liquid-liquid microextraction, and related techniques. General features of different microextraction procedures, historical overview and automation of LPME are described and compared, along with examples of new developments and applications presented to demonstrate its potential for trace and ultra-trace metal analysis. Furthermore, potential applications and an outlook on the combination of LPME and elemental detection techniques for inorganic analysis are presented.The authors would like to thank the Spanish Ministry of Economy and Competitiveness and European Union (FEDER funds) (project n. CTQ2016-79991-R) for the financial support. P. Baile also thanks Ministry of Education, Culture and Sports for her FPU grant (FPU14/04589)

The tutor’s roles and functions in online education. Qualitative study within the context of worker training

E-learning education has become a reality that transcends the educational environment. This research focused on continuouseducation of working people for whom e-learning offers many advantages given the characteristics of this group. The tutoringprocess is key when introducing improvements and contributing to the progress of this educational experience. The research herepresented was intended to analyze the functions performed by teletutors in carrying out their educational function, highlighting elearningtutoring styles. The methodology employed was qualitative, and in-depth interviews with tutors of 29 online courses were conducted. The data were gathered within the framework of a program of continuous training courses for autonomous workers from small and medium-sized companies. The analyses performed allowed for in-depth study of the dimensions and functions performed by tutors in the educational activity. The Atlas.ti software was used for qualitative analysis that allowed for the construction of several category systems relating to a series of comprehensive theoretical frameworks. Several flow charts were drawn for each one of these theoretical frameworks that allowed for a better understanding of the relationships between the categories and dimensions of each tutor participating in the study. It was also possible to establish tutor typologies according to their roles and functions, the resources used in tutoring and the features that characterize students that participate in e-learnin

SUDOchessKUS : las matemáticas sobre el tablero del ajedrez educativo

El aprendizaje de las Matemáticas puede beneficiarse de la utilización de materiales y recursos innovadores, lúdicos y manipulativos, que permiten presentar los conceptos de forma más interesante y motivadora; relacionando así las Matemáticas con otros aspectos de la vida para que resulten más accesibles a cualquier edad y añaden un componente gamificador que las hace mucho más atractivas. Presentamos aquí varios tipos de sudokus de ajedrez (que hemos denominado SUDOchessKUS) para enseñar Matemáticas de una manera más original, que incluyen propuestas curriculares para tratar contenidos de: aritmética, geometría o álgebra, así como otras propuestas transversales e interactivas que ayudarán a los docentes a preparar las clases y enganchar a tus alumnos al maravilloso mundo de las matemáticas. Pretendemos tratar las siguientes temáticas: Materiales, textos y otros recursos de apoyo a la enseñanza, razonamiento matemático y cálculo de una o varias variables.Realizamos también un recorrido por los eventos ajedrecísticos en que han sido presentados los SUDOchessKUS, bien sea en forma de ponencia como de su práctica bajo el formato de talleres.Y para finalizar amplias referencias bibliográficas, artículos o web para que aquellos inquietos profesores que quieran aplicar en sus aulas las originales propuestas didácticas que se explican en esta colaboración, puedan ampliar la información.The learning of Mathematics can benefit from the use of innovative, playful and manipulative materials and resources. This allows us to present concepts in a more interesting and motivating way; thus linking Mathematics with other aspects of life so that they are more accessible to people of all ages. It also adds a gamifying aspect which makes them much more attractive. Here we introduce various types of chess Sudoku to teach maths in a more original way, we have called them SUDOchessKUS. This presentation includes curricular proposals to deal with contents such as: arithmetic, geometry or algebra, as well as other interactive and cross-curricular proposals that will help teachers to prepare lessons and engage their students in the wonderful world of Mathematics. We aim to deal with the following topics: materials, texts, other resources to support teaching, mathematical reasoning and calculation of one or more variables. We have also made a tour of chess events in which the SUDOchessKUS have been introduced both as a paper and as practice in a workshop. To finish off we present extensive bibliographic references, articles and webpages so that those restless teachers wishing to apply these original didactic proposals in their classroom could increase their understanding in the topic

Learning on real robots from experience and simple user feedback

In this article we describe a novel algorithm that allows fast and continuous learning on a physical robot working in a real environment. The learning process is never stopped and new knowledge gained from robot-environment interactions can be incorporated into the controller at any time. Our algorithm lets a human observer control the reward given to the robot, hence avoiding the burden of defining a reward function. Despite the highly-non-deterministic reinforcement, through the experimental results described in this paper, we will see how the learning processes are never stopped and are able to achieve fast robot adaptation to the diversity of different situations the robot encounters while it is moving in several environments.This work was supported by the research grant TIN2009-07737 of the Spanish Ministerio de Economía y Competitividad, and María Barbeito program of the Xunta de Galicia