ÁR

Ángel Roco-Videla

Universidad Bernardo O'Higgins

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i-10 index

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Co-Authors

Sergio Flores

Mútua Terrassa

Raúl Aguilera-Eguía

Universidad Católica de la Santísima Concepción

Nelson Maureira-Carsalade

Universidad Católica de la Santísima Concepción

Mariela Olguín-Barraza

Universidad Bernardo O'Higgins

Marcela Caviedes-Olmos

University of the Americas

Román M. Montaña

Arturo Prat University

Héctor Fuentes-Barría

Universidad Andrés Bello

Siva Avudaiappan

Metropolitan University of Technology

Yousef Zandi

Islamic Azad University of Tabriz

María-José Marsano-Cornejo

Arturo Prat University

Cooperative Institutions

Universidad Católica de la Santísima Concepción

University of Bío-Bío

Universidad Autónoma de Chile

University of Chile

University of the Americas

University of Concepción

Universidad Bernardo O'Higgins

Pontificia Universidad Católica de Chile

Universidad Andrés Bello

Universidad de Santiago de Chile

Author Statistics

Papers

Citation

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Research Field

Malnutrition and sarcopenia in patients with liver cirrhosis

Nutrición Hospitalaria (2023)

Mónica Zúñiga González Ángel Roco-Videla

10.20960/nh.04773

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Importance of the PRISMA guideline

Nutrición Hospitalaria (2023)

Cristian Yáñez-Baeza Raúl Aguilera-Eguía Héctor Fuentes-Barría Ángel Roco-Videla

Guideline

10.20960/nh.04616

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Citations (2)

Bibliometric analysis of early childhood stuttering (1975-2024)

Salud Ciencia y Tecnología (2024)

Virginia García-Flores Yasna Sandoval-Fox Marcela Sanhueza-Garrido Ángel Roco-Videla

Introduction: suttering in early childhood affects 5 % of children, with a prevalence of 1 % in the general population. Although most recover spontaneously, 20 % may persist into adulthood, negatively impacting their quality of life. The objective of this research is to analyze the evolution of research on stuttering in early childhood through publications indexed in the Web of Science (WoS) database between 1975 and 2024.Methods: a bibliometric analysis of 1 130 articles extracted from WoS was carried out using the VOSviewer software. Publications, citations, thematic categories, authors, keywords, institutional collaborations and the most relevant countries were analyzed.Results: between 1992 and 1995, there was the greatest increase in publications in the area with 44 articles. The peak of citations was in 2021 with 1 704 citations. The United States leads the production with 581 articles, followed by Australia with 128 articles. The most frequent keywords were "stuttering", "speech" and "children".Conclusions: there is a sustained growth in the number of publications in the area, which has also begun to diversify in recent years. There is an inequality in production within the area, since it is dominated by publications from a limited group of countries.

Stuttering

10.56294/saludcyt2024.1218

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Influence of crack on the permeability of plastic concrete

Smart Structures and Systems (2021)

Yongqiang He Rayed Alyousef Abdulaziz A. Al‐Askar Hisham Alabduljabbar Abdeliazim Mustafa Mohamed

This study examined the relations between permeability of the concrete due to addition of new cracks. The different concrete types analyzed were standard concrete, reinforced steel fiber concrete, and reinforced concrete polypropylene fiber. In consideration of the improved polypropylene content of polypropylene fiber reinforced concrete, the crack diameter was decreased by 72-93% for up to 0.25% fiber and cracks were eliminated with 0.3% fiber inclusion. In terms of steel fiberreinforced concrete, the results showed that steel reinforcing macro fibers decrease the permeability of cracked concrete at wider crack widths. While the permeability of unreinforced concrete was the highest, 0.5% steel content resulted in lower permeability while a higher steel content concrete with 1% steel had the lowest permeability. Crack stitching phenomenon and the effect of multiple cracks may be attributed to the decrease in the permeability. With respect to normal concrete, the findings showed the crack opening displacement at the highest tension is less than 20 microns. At this loading stage, after unloading, around 80% of the displacement is restored and the residual crack opening is notably small, indicating the low impact of cracking on concrete permeability (CP) and showing that CP was increased with crack width. As a result, adding polypropylene aggregate to concrete could significantly reduce the width of crack, while adding steel fiber to concrete reduces the permeability of cracked concrete compared to normal concrete which may result in a minor crack on CP.

Polypropylene

Fiber Reinforced Concrete

10.12989/sss.2021.27.5.871

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Genotype frequencies and the Hardy-Weinberg equilibrium on rs9939609 FTO and rs17782313 MC4R: Implications for statistical associations to overweight and obesity in children and adolescents (re. “Polymorphisms on rs9939609 FTO and rs17782313 MC4R genes in children and adolescent obesity: a systematic review”)

Nutrition (2022)

Sergio Flores Ángel Roco-Videla Omar Silva-González

FTO gene

Hardy–Weinberg principle

10.1016/j.nut.2022.111745

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Citations (1)

Nano-SiO2 for efficiency of geotechnical properties of fine soils in mining and civil engineering

Advances in nano research (2021)

Qiao Yanzhen Yousef Zandi Abouzar Rahimi Sara Pourkhorshidi Ángel Roco-Videla

Taking into account the decreased number of available lands, the construction of structures on soft soil leads towards the development of soil stabilizing models. This study is aimed at studying the decrement of land resources available, and the design of civil engineering structures on soft soils that will develop the soil impact of nano-SiO2 in the use of clay soil with low liquid limit, in particular shear resistance and unconfined compression. A novel nano-soil stabilizer has been created in this investigation by use of nano-SiO2 activity and ultrafine features that have enabled cement-based stabilizers to increase their characteristics in broad application possibilities. This research aims to examine the influence on soil engineering, particularly the shear strength of clay soil with a low liquid limit to the effect of adding nano-SiO2. Nano-SiO2 has 3 different percentages combined with soil (i.e., 0.5, 0.7 percent by weight of the parent soil), A direct shear test was used to evaluate the shear strength of the specimen, and then the results were analyzed by Artificial Neural Network (ANN) to increase the accuracy of outcomes. Increased nano-SiO2 concentration was shown to lead to an increased internal friction angle and cohesiveness on clay soil. The optimal content for nano-SiO2 is 0.7%. ANN could accurately demonstrate the shear strength percentages in nano-SiO2 content.

Atterberg limits

Direct shear test

Shear Strength

Cohesion (chemistry)

Stabilizer (aeronautics)

Soil test

10.12989/anr.2021.11.3.301

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Citations (1)

Experimental study on the mechanical behavior of polypropylene fibre reinforced concrete subjected to monotonic loads

Latin American Journal of Solids and Structures (2021)

Eduardo Núñez Ronald Torres-Moreno Salvador Ligas-Fonseca Guillermo Bustamante-Laissle Nelson Maureira-Carsalade

The properties of fibre reinforced concrete were studied under monotonic loads according to Japanese, North American and European codes. Two different types of SIKA polypropylene fibre were with different dosages. One hundred and eighty tests were performed, obtaining resistance to compression, tension, bending, toughness, and energy absorption in the hardened state. The results show that the addition of fibres affects the workability of the concrete mix. The increase in fibre dosage does not affect compressive, tensile, or flexural strength. However, the failure changes from brittle to more ductile, allowing it to reach residual strengths of 50% of the maximum reached and 200% deformation. The dissipated energy increased with increasing fibre dosage. The performance achieved by both fibres was similar, although the optimal dosage was 6 kg/m3 for type A fibres and 8 kg /m3 for type B. Therefore, the replacement of flexural reinforcing steel in the foundation slabs of one-story buildings can be performed if adequate dosages are used in compliance with established analytical procedures for industrial floor design.

Polypropylene

Brittleness

Tension (geology)

10.1590/1679-78256638

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Citations (1)

Sound pressure level in the speech signal due to the use of a mask or face shield

Salud Ciencia y Tecnología (2024)

María-José Marsano-Cornejo Ángel Roco-Videla Raúl Aguilera-Eguía Sergio Flores

Introduction: the use of masks and face shields became widespread during the COVID-19 pandemic, but their impact on vocal health, especially in those who use their voice as a work tool, is not yet fully studied. This study investigates the effect of different types of masks and face shields on the sound pressure level of the voice, with special attention to the risk of developing vocal pathologies.Methods: voice recordings were made of 18 participants (11 women and 7 men) in an audiometric booth, measuring the equivalent continuous sound pressure level (Leq) with a sound level meter. The results obtained with different types of masks (surgical, KN95, with transparent window) and a face shield were compared.Results: no significant differences were found in Leq between the groups with and without protective elements. However, it was observed that women tend to increase the intensity of their voice when wearing masks or face shields, which could lead to greater vocal effort and a potential risk of developing long-term vocal pathologies.Conclusions: Although the use of masks and face shields is necessary in certain contexts, it is important to consider the possible consequences for vocal health, especially in women. The use of non-verbal language is recommended to complement communication and avoid combining KN95 masks with face shields when not strictly necessary.

SIGNAL (programming language)

10.56294/saludcyt2024.1325

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Frecuencia fundamental en hombres transexuales en diferentes etapas de tratamiento hormonal

Revista de Investigación en Logopedia (2022)

María José Marsano-Cornejo Ángel Roco-Videla Kimberly Bascuñan-Reinoso Valery Garrido-Morales Maite Gonzalez-Reyes

El tratamiento hormonal que reciben los hombres transexuales tiene entre sus efectos la masculinización de la voz. El objetivo de esta investigación es medir la mediana de la frecuencia fundamental en el habla (Mf0) en hombres transexuales en distintas etapas de su tratamiento hormonal y determinar si existe una alta correlación entre este parámetro y el número de dosis recibidas. Utilizando Praat se obtuvo el valor de la Mf0 de una serie automática de palabras, su valor mínimo, máximo y rango. Grupo 1: sujetos con 11 o menos dosis de testosterona. Grupo 2: sujetos con 12 o más dosis. Los valores encontrados son comparables con los esperados para hombres no transgéneros. No se encontraron diferencias significativas respecto a la Mf0, Mf0min, Mf0máx y rango, al comparar los grupos 1 y 2. Existe una correlación baja entre el número de dosis y la Mf0. Existe una asociación entre el tratamiento hormonal y la masculinización de la voz, sin embargo, no existe evidencia que señale que a mayor número de dosis de hormonas exista una mayor masculinización de la voz. Se necesita realizar nuevas investigaciones con población más grande para verificar estos resultados.

10.5209/rlog.78276

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Citations (1)

Learning approaches in students of the areas of Health Sciences belonging to a regional university in Chile

Salud Ciencia y Tecnología (2024)

Mónica Helena Cardona Valencia Aurora Henríquez-Melgarejo Trinidad Cifuentes Muñoz Carolina Luengo Martínez Ángel Roco-Videla

Introduction: in university education, various factors such as emotional aspects, behavior and cognitive elements influence the participation of students in the learning process. The students who achieve the best results are those who participate metacognitively, with motivation and active behavior, also considering contextual and personal factors. It is at this point where the learning approach plays a fundamental role in understanding academic performance.Methods: in the present research, 277 health sciences students from a Chilean public university were evaluated using a Spanish version of the R-SPQ-2F questionnaire to evaluate learning approaches, motives and strategies.Results: most of the students presented a predominantly deep learning approach, although with a low intensity. At the strategy level, 32.85% presented a superficial approach. Significant differences were found between the approaches and between their respective subscales.Conclusions: Those who present a deep approach usually present deep strategies and motives. The presence of deep motivation without a deep type of strategy is usually associated with a superficial approach.

10.56294/saludcyt2024.1317

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