bluuebunny/crossref_metadata_2025 huggingface dataset:
Diseño y Análisis No-Lineal del Tercer Juego de Esclusas del Canal de Panamá Frente a Cargas Estáticas y Sísmicas
Authors: Luszczyk Castiñeira Gustavo E. , Ferrari Francisco J. , Jimenez Vazquez Federico
Published: February 2025

El diseño de las estructuras del tercer juego de esclusas del Canal de Panamá demandó la implementación de modelos de elementos finitos no-lineales, los cuales fueron utilizados para diseñar los elementos estructurales que las componen. Los modelos numéricos de elementos finitos en 2D y 3D desarrollados consideraron diferentes condiciones de cargas estáticas y también dinámicas producidas por sismos mediante el software Abaqus. Las condiciones sísmicas aplicadas, mediante un análisis del tipo time-history dinámico implícito, incluyeron un análisis de convolución de la señal y el empleo de condiciones de borde absorbentes, que fueron codificadas en Fortran y validadas como elemento de usuario dentro del software. En las simulaciones fueron tenidas en cuenta las interacciones entre diferentes partes, como ser las estructuras de hormigón, el agua en las esclusas y las compuertas, para lo cual se definen superficies de interacción entre las mismas. También fue tenida en cuenta la plasticidad mediante una formulación de Mohr-Coulomb en la roca de fundación. Estos modelos numéricos permiten un grado de optimización y confiabilidad en el diseño que no puede ser llevado a cabo mediante cálculos simplificados, además dan la posibilidad de realizar un análisis de integridad de las estructuras de hormigón ante eventos extremos de solicitación. Las herramientas y metodologías desarrolladas para este trabajo se continúan utilizando para otros proyectos de grandes estructuras de hormigón como es el caso de presas.
Análisis Numérico del Comportamiento Estructural de Arcos y Bóvedas de Mampostería en Edificios Patrimoniales Históricos
Authors: Moreno Guadalupe , Almenar Martín , Gutierrez Sergio
Published: February 2025

Los edificios históricos representan una parte fundamental del patrimonio cultural. El método de los elementos finitos es una herramienta invaluable para abordar distintos estados de cargas, modelar geometrías complejas de estructuras de mampostería (bóvedas, arcos, pilares), y simular efectos no lineales, tanto en el material como en la geometría. En este trabajo, se utiliza la herramienta computacional Ansys Workbench. Se modelan numéricamente casos típicos de arcos y se estudian casos complejos de arcos y bóvedas a fin de obtener una noción más realista del comportamiento estructural que estos elementos presentan al ir complejizando su forma. Finalmente, se realiza un caso de estudio de una bóveda de mampostería. Se obtiene un mapa de deformaciones plásticas coherentes con estados de fisuración causados por el estado de carga de peso propio y un eventual asentamiento de las cimentaciones.
Determinación Numérica de Cargas Críticas de Pandeo Local en Perfiles de Pared Delgada y Abierta Sometidos a Cargas de Flexocompresión
Authors: Ratazzi Alejandro R. , Felix Daniel H. , Gilardi Gonzalo J.
Published: February 2025

En el presente estudio numérico se determinan y comparan los valores de carga crítica que producen el pandeo local de perfiles de sección delgada y abierta cuando se encuentran sometidos a cargas de flexo-compresión. Para ello se utilizan 2 métodos de cálculo, siendo estos el método analítico clásico, el método de la fuerza directa y el método de elementos finitos. Se adoptan variantes de una sección transversal del tipo omega considerando diferentes espesores de chapa y diferentes dimensiones de alas y pestañas. También se ha tenido en cuenta la homogeneidad del material del perfil.
Simulación Acoplada de Explosiones Externas sobre Tanques de Almacenamiento Metálicos
Authors: Rodríguez Salinas Fátima B. , Luccioni Bibiana
Published: February 2025

Normalmente se utilizan tanques metálicos cilíndricos para almacenamiento de distintos productos petroquímicos. La respuesta y el proceso de falla de los tanques de acero bajo ondas de choque producidas por explosiones externas constituyen problemas dinámicos complejos, muy rápidos, con un grado de acoplamiento importante y alta no linealidad. En este trabajo se analiza mediante un código multifísica explícito los efectos de la posición de la carga explosiva, la geometría y propiedades del material en la respuesta de tanques cilíndricos de combustibles bajo explosiones externas. El análisis comienza con la generación de la onda de presión producida por la explosión siguiendo luego con la interacción con el tanque. Se comparan los resultados con los obtenidos con una distribución analítica de presiones disponible dentro del mismo software. Adicionalmente, se tiene en cuenta el efecto del líquido en el interior de tanque y la presencia de otros tanques u obstáculos en el camino de la onda. Se estudia la deformación y posible falla del tanque. Los resultados muestran la importancia analizar el problema acoplado y resultan de interés para el diseño y verificación de seguridad de este tipo de tanques frente a explosiones externas.
Análisis Numérico del Estado de Fisuración en Muros de Mampostería de Edificios Patrimoniales Históricos
Authors: Sollazzo Luciano , Almenar Martín E. , Gutierrez Sergio
Published: February 2025

Los edificios históricos conforman una parte importante del patrimonio cultural. La mayoría de los edificios de carácter histórico fueron construidos con muros de mampostera. Una problemática común en mampostería es la aparición de fisuras producidas por asentamientos de muros o pilares. El estudio de soluciones habituales que intentan reparar o reforzar el estado fisurado con vista a recuperar la capacidad estructural de la edificación resulta de sumo interés. A través del método de los elementos finitos se puede realizar el análisis de refuerzos a los fines de evaluar su comportamiento y eficiencia mediante la simulación de efectos no lineales, tanto material como de geometría. Este trabajo estudia mediante un modelo de elementos finitos el comportamiento de un muro de mampostería y la propagación de fisuras que puede aparecer ante distintos tipos de asentamientos. Se plantea una propuesta de reparación y refuerzo que es analizada desde el punto de vista de la redistribución del estado tensional en el muro ante la nueva configuración estructural
Modelado de la Falla del Tubo de Fuego de un Intercambiador de Calor
Authors: Subelza Noemí , Calabró Horacio D. , Jaca Rossana C. , Sosa Eduardo M.
Published: February 2025

El equipamiento usado en la industria de destilación y procesado de petróleo se encuentra sometido a exigentes condiciones de servicio y demandas crecientes. En particular, los intercambiadores de calor permiten la separación del agua contenida en el petróleo y disponen en su interior tubos de fuego donde los gases de combustión generan la temperatura necesaria para el proceso de separación. Este trabajo presenta un análisis de la respuesta estructural de un tubo que presenta grandes deformaciones en un sector localizado próximo al quemador, con el objetivo de identificar las causas que produjeron esa falla. El análisis de falla contribuye a mejorar las condiciones de trabajo y evitar interrupciones en la producción. Un estudio previo de la metalografía del material indica un crecimiento de grano excesivo congruente con una exposición a temperaturas elevadas en la zona del daño. Se modela el tubo con elementos finitos sólidos y se considera la variación de las propiedades mecánicas del acero con la temperatura. Se implementa un análisis no lineal geométrico incluyendo plasticidad del material con el objeto de reproducir el mecanismo de falla. El estudio muestra la necesidad de monitorear la distribución de temperaturas en el tubo para reducir la posibilidad de formación de zonas con concentración de altas temperaturas.
Dinámica de Vigas Rectas y Curvas Funcionalmente Gradadas Incorporando Resonadores Locales Electromecánicos: Análisis de Bandas de Atenuación
Authors: Fruccio Walter H. , Piován Marcelo T. , Hecker Rogelio L.
Published: February 2025

El estudio de la propagación de ondas en metamateriales representa un campo nuevo y emergente en la ingeniería, en especial en materiales compuestos que tienen algún tipo de periodicidad y poseen propiedades excepcionales que no se encuentran comúnmente en otro tipo de materiales. Estos metamateriales poseen un atractivo comportamiento vibratorio, es decir, la presencia de bandas de atenuación en un determinado rango de frecuencias, lo que conduce a la reducción parcial o total de la amplitud vibratoria de las ondas. Este fenómeno es de particular utilidad para la atenuación de fenómenos oscilatorios, o para la supresión de señales en un rango de frecuencias dado.En particular, las bandas de atenuación pueden ser modificadas substancialmente por la variabilidad asociada a la incertidumbre en los parámetros, o de acuerdo a las características materiales y geométricas de la estructura periódica.En este trabajo se introduce un modelo de viga de paredes delgadas, creada mediante materiales funcionales gradados cerámico/metálicos con inclusión de resonadores locales electromecánicos. El modelo de viga se basa en la incorporación de flexibilidad por corte generalizada para flexión y torsión con alabeo no uniforme. Las ecuaciones que gobiernan el problema dinámico se deducen empleando el principio de trabajo virtual. Se evalúa la aparición de bandas de atenuación como resultado del cambio de configuraciones de los resonadores y de las propiedades gradadas de la estructura portante. Se construye un modelo computacional empleando el método de elementos finitos a partir de la formulación débil asociada al principio de trabajo virtual. Con este enfoque computacional se efectúan estudios y comparaciones de casos, orientados a la detección de las bandas de atenuación en el dominio de frecuencias. Se realiza el estudio de la incertidumbre de los parámetros, mediante el enfoque probabilístico paramétrico. El modelo probabilístico se construye apelando al modelo computacional del enfoque determinista.
Análisis de Bandas de Atenuación en Vigas Rectas Construidas Mediante Fabricación Aditiva Incorporando Resonadores Mecánicos Masa-Resorte
Authors: Fruccio Walter H. , Masch Federico R. , Piován Marcelo T. , Hecker Rog
Published: February 2025

La fabricación aditiva ha tenido un crecimiento exponencial en los últimos años. Lo que genera interés en la implementación, para la construcción de meta-estructuras. Estas, pueden generar un comportamiento vibratorio muy interesante, es decir, la presencia de bandas de atenuación en un determinado rango de frecuencias. En este trabajo se introduce un modelo computacional unidimensional de viga recta de paredes delgadas, con la inclusión de resonadores mecánicos masa-resorte. Se construyó un modelo de elementos finitos 1D a partir de la formulación débil del principio de trabajo virtual. El modelo fue evaluado mediante diferentes ensayos dinámicos, en vigas rectas fabricadas con la tecnología de impresión 3D. En tal sentido, el resorte de los resonadores también fue fabricado con dicha tecnología. Paso previo, se realizaron ensayos para determinar los parámetros de rigidez y masa efectiva del resonador, al fin de obtener valores para la posterior comparación con el modelo a evaluar. Dichos parámetros, pueden generar una modificación en la banda de atenuación, esto hace que el estudio de la variabilidad ante la incertidumbre en dichos parámetros sea relevante para nuestro análisis.
Análisis Computacional de la Fuente Térmica Equivalente en un Problema Acoplado de Calentamiento Remoto
Authors: Ginóbili Lautaro , Otero Fernando
Published: February 2025

El efecto fototérmico debido a la resonancia plasmónica de superficie tiene varias aplicaciones interesantes en campos como la optoelectrónica, la fotónica, y la nanotecnología. Sin embargo, su uso plantea el análisis de la multifísica de problemas térmico-radiativos acoplados de gran complejidad, tanto en términos teóricos como computacionales, que sólo pueden resolverse en forma aproximada. Este trabajo investiga la cuantificación de incertezas proveniente de los errores de modelado en una fuente térmica equivalente para un problema de calentamiento remoto acoplado, sobre un nanocompuesto con nanopartículas de oro. Como punto de partida se explora un modelo simplificado para una barra unidimensional infinita y se estudia su alcance en la práctica, para luego enfocar el análisis en resultados numéricos hallados mediante la optimización basada en simulación. Específicamente, se analiza el impacto de modelar una fuente térmica equivalente en el perfil de temperaturas y especialmente en la caracterización térmica del material, estudiando asimismo la sensibilidad de la fuente a parámetros de diseño del nanocompuesto.
Probabilidad de Estados de Daño en Estructuras Utilizando Parámetros Dinámicos e Inferencia Bayesiana
Authors: Möller Oscar , Lucero Germán , Ascheri Juan Pablo
Published: February 2025

El monitoreo de la salud estructural es un tema de interés por el impacto sobre los programas de mantenimiento de infraestructura. Hay que considerar si hay o no daño, donde se localiza, su magnitud y la estimación de vida útil residual. La metodología implementada es proponer “escenarios de daños” en un modelo numérico del sistema, incluyendo incertidumbres en las características físicas mediante campos aleatorios. Para cada escenario de daños se realiza la estadística de las propiedades dinámicas, modos y frecuencias, sobre las variables aleatorias aplicando Monte Carlo. Registrada una medición aceleración-tiempo e identificados los parámetros dinámicos, con la estadística se calcula la probabilidad “a priori” de obtener esos parámetros dinámicos para cada escenario de daños. Aplicando inferencia bayesiana, se calcula la probabilidad “a posteriori” dada la medición registrada. El proceso se repite hasta convergencia. El resultado final indica qué probabilidad de ocurrencia tiene cada escenario de daños. Se aplica a un modelo de puente losa y se concluye que la mejor opción es utilizar el vector de frecuencias como parámetros dinámicos.
Simulación de Escenarios Críticos para el Cultivo de Tomate en Invernaderos de La Plata
Authors: Aguilar Ferraro Santiago , Muñoz Vásquez Natalia , Del Sole Micaela , Garbi Mariana , Martinez Susana B. , Colman Lerner Jorge E. , Porta Atilio A. , Demetrio Pablo M. , Sanchez Erica Yanina
Published: February 2025

En el cinturón frutihortícola de La Plata, una de las prácticas más frecuentes es el cultivo de tomate en invernaderos. Este cultivo es sensible a los cambios bruscos en las condiciones ambientales, afectando su normal crecimiento y desarrollo. Partiendo de mediciones in situ, para el período de cultivo, se analizaron escenarios críticos para el crecimiento de la planta y el desarrollo del fruto. Se ejecutaron simulaciones en EnergyPlus y ANSYS CFD con el objetivo de evaluar las condiciones ambientales que se presentaron en diferentes etapas del ciclo del cultivo y posibles escenarios de optimización. Se observa que, en situaciones de temperatura externa mayor a 35 °C la ventilación natural y la forzada sin refrigeración, no son suficientes para alcanzar temperaturas internas óptimas para el cultivo por lo que, sería necesario incorporar mecanismos de refrigeración.
Simulación por CFD de la Pérdida de Carga en Canales con Cambio Abrupto de Área: Comparación con Correlaciones de la Literatura
Authors: Kourani Agustin , Godino Darío , Corzo Santiago , Giménez Nicolás , Giménez Emanuel , Ramajo Damián
Published: February 2025

Las correlaciones empíricas para determinar la pérdida de carga en cañerias y canales han sido clave en el diseño de instalaciones complejas, siempre que se respeten los rangos de validez (número de Reynolds, temperatura, presión, etc.) los cuales a menudo no están bien definidos. Además, se suele asumir que la pérdida total es la suma de las pérdidas individuales, aunque estas se ensayen con flujo perfectamente desarrollado. Este trabajo utiliza simulaciones de mecánica de fluidos computacional (CFD) para evaluar la pérdida de carga en canales con contracciones y expansiones de diferentes relaciones de aspecto (L/A). Los resultados obtenidos muestran una excelente concordancia entre CFD y las correlaciones en contracciones y expansiones aisladas. Asimismo, se observa que la pérdida total no es la suma de coeficientes aislados, salvo que L/A sea elevado, lo que permite que el flujo se desarrolle antes del siguiente cambio de área.
Sensitivity to Cavitation and Turbulence Parameters in Asymmetric Nozzles Flow Numerical Simulations
Authors: Márquez Damián Santiago , Lesciutta Tomás , Coussirat Miguel
Published: February 2025

Cavitating flows are a complex phenomenon involving turbulent flow and phase change, both of which must be considered in its modeling. This study examines the sensitivity of the simulated flow in asymmetric nozzles to the cavitation and turbulence models calibration parameters involved. Building upon previous studies and using the Computational Fluid Dynamics tool Open-FOAM(R), a more detailed investigation was performed based on the k−omega SST turbulence model and the Schnerr-Sauer cavitation models for cases of quite developed cavitation. The results reinforce previous conclusions related to the suitable cavitation and turbulence models calibration on the representation of the cavitated zone.
Estudo Numérico do Conforto Térmico em Arranjo de Edificações com Uso do OpenFOAM
Authors: Andrade Soares Raul César , Silva Paulo Ulisses , Bono Gustavo
Published: February 2025

O Brasil é um país de clima predominantemente quente, portanto, métodos de obtenção de ventilação natural devem ser considerados como meio de se obter conforto térmico de ambientes. Este trabalho, tem como proposta investigar a ventilação natural e conforto térmico de arranjos de edificações, fazendo uso da Mecânica dos Fluidos Computacional. Para isso será utilizado o software OpenFOAM, utilizando-se do modelo de turbulência k-´épsilon padrão. Foi avaliado um modelo 3D de um projeto típico de residência do programa Minha casa, Minha Vida, inserida em um arranjo de edificações, simulando assim, um conjunto habitacional. O método Elevated Air Speed Comfort Zone (ASHRAE, 2017) foi considerado para a determinação da ocorrência ou não de conforto térmico. Foram resolvidos os campos de velocidade, pressão e temperatura, sendo possível observar que alguns cômodos obtiveram desconforto térmico causado pelo excesso de velocidade de vento, principalmente na casa a barlavento. As casas a sota-vento apresentaram a maioria dos ambientes dentro das faixas ideias de conforto térmico.
The Effects of the ILH-based DDL on the Ability of Thai EFL Learners to Use Academic Collocations
Authors: Sridhanyarat Kietnawin , Tangkiengsirisin Supong
Published: February 2025

The purpose of this study is two-fold: 1) to investigate the effects of Data-Driven Learning (DDL) framed within the Involvement Load Hypothesis (ILH) on Thai learners’ use of academic collocations and 2) to examine how Thai learners utilized the involvement load (IL) components (need, search, and evaluation) to master academic collocations. It is hypothesized that the more learners actively engage with the IL components in a DDL task, the greater their development will be in acquiring new collocations. Participants (n = 31) were provided with repeated exposure to authentic L2 input (COCA) through DDL. They explored and analyzed three collocation patterns: adjective-noun, verb-noun, and adverb-past participle. The learners also verbalized their thoughts while completing the DDL tasks. A multiple-choice test and a collocation judgement test were constructed to assess the students’ academic collocation competence. The results demonstrated that the ILH-based DDL generated a significant effect on Thai learners’ performance of academic collocations. Thai learners also utilized all of the IL components in acquiring academic collocations through DDL. The search component was used most frequently, followed by the evaluation and need components. These findings provide useful insights into both the predictions of the ILH and L2 pedagogy regarding academic collocation learning.
Effects of Cloud-based Gamified Instruction Integrating Peer Assessment on Primary Students’ English Writing and Critical Thinking
Authors: Eang Norphealey , Petsangsri Sirirat , Morris John
Published: February 2025

English writing and critical thinking are not only fundamental to academic success but also play a crucial role for the holistic development of primary students. This study investigated the effects of a cloud-based gamified instruction integrating peer assessment on primary student English writing and critical thinking. A pre- and post-test with a delayed pos-test research design was used; thirty-five grade sixth students participated in the study. The research instruments included writing and critical thinking tests. The data were analyzed using repeated measures ANOVA. There was a significant improvement writing from a pre-test through and post-test and delayed post-test (F = 853.76, p < 0.001). The F-value indicated a significant difference between pre- and post-test, but there was little difference between post- and delayed post-tests. The high effect size (η² = 0.96) confirmed the effectiveness of the intervention on writing. Similarly, analysis also indicated a significant effect the intervention on the critical thinking improvement over time (F = 632.89, p < 0.001). The high effect size (η² = 0.95) emphasized the practical significance of the improvements across the three time points. This confirmed the positive effects of the cloud-based gamified instructional model on writing and critical thinking.
Quantitative Reconsideration of an L1 Effect on Asian Learners’ L2 English Writing: A Study Based on the ICNALE
Authors: Ishikawa Shin’ichiro
Published: February 2025

A writer’s L1 is generally believed to influence their L2 English writing significantly. However, the extent to which L1 backgrounds influence Asian learners’ L2 English writing has not been wholly elucidated due to the lack of data covering various learners in Asia. Therefore, this study analysed more than one-million-word essays written by 2,318 Asian students with 18 regional backgrounds and more than 14 L1 backgrounds, which were taken from the International Corpus Network of Asian Learners of English (ICNALE) Written Essays and the ICNALE Written Essays Plus, currently under construction. The analytical focus was whether learners with the same or similar L1 backgrounds were agglomerated in a single subcluster despite the difference in the other parameters, such as essay topics. Hierarchical agglomerative cluster analyses that focused on the surface layer (words), the deeper layer (lexicogrammatical features), and the latent layer (textual factor scores) of student writing revealed that the degree of L1-based output similarities may be much lower than generally believed, which requires us to reconsider the traditional view that a writer’s L1 is an absolute factor in determining the aspects of their L2 use and establish a new analytical framework for discussion of Asian learners’ L2 English.
Evaluating the Effectiveness of Blended Learning in an EFL Undergraduate Classroom
Authors: Nusong Kwanchanok , Watanapokakul Sasa
Published: February 2025

With the rapid advancement of technology and the need for flexible learning solutions, educational institutions are integrating more and more digital components into their curricula. Blended learning (BL) has emerged as a promising approach, combining the strengths of traditional classroom instruction with the advantages of online learning. This mixed-methods study investigates the effectiveness of BL in an EFL undergraduate course on students’ English proficiency and through their attitudes. In the second semester of the academic year 2022, 269 students at a university in the west of Thailand participated in BL for a course named Basic English I. Data were collected via online pre-and post-tests, questionnaires, and semi-structured interviews. Of the 269 participants, 194 students from 13 majors completed the pre-and post-tests and questionnaires, and 20 volunteers were interviewed for in-depth information. The paired samples t-test and Cohen’s d indicated significant improvement in students’ English proficiency post-intervention, demonstrating the effectiveness of BL. The questionnaire analysis also revealed positive attitudes towards BL, while a thematic analysis of the interviews highlighted BL’s flexibility, accessibility, and ability to enhance engagement and understanding. Participants suggested improvements to the instructional methods and technical support as well, in order to further enhance the learning experience.
The Implementation of Extensive Reading to Foster EFL Thai Undergraduates’ Narrative Writing Performance and Attitudes
Authors: Tantipidok Pasika
Published: February 2025

The study examined the enhancement of EFL Thai undergraduates’ narrative paragraph writing through extensive reading (ER) and investigated the attitudes of EFL Thai undergraduate students towards ER. Forty-nine non-English major students at a public university in Thailand participated in the study over ten weeks. Two experimental groups were assigned. Twenty-five students were assigned to read graded readers one level beyond their current level of competence (i+1), and the other twenty-four students read graded readers at one level beneath their current level of competence (i-1). Quantitative data were collected through the pre- and post-narrative writing tests. A questionnaire was delivered to both groups after testing the participants. Semi-structured interviews were conducted to get qualitative data. The results revealed that ER improved the writing performance of EFL Thai undergraduates in both i+1 and i-1 groups. However, no significant difference was found between the two experimental groups on overall writing performance and the other five specific writing features including content, organization, vocabulary, language use, and mechanic. Moreover, the results indicated that both i+1 and i-1 groups had positive attitudes towards ER. The findings suggested that ER is an effective method for EFL students to improve their narrative writing performance, and it should be promoted in English classrooms.
The Role of Reverse Linguistic Stereotyping in Thai English Learners’ Language Attitudes toward English Speakers
Authors: Jindapitak Naratip , Comprendio Luke Jobert Earl Vencer
Published: February 2025

This study explores how reverse linguistic stereotyping (RLS) affects Thai English learners’ evaluations of English speakers and their choices of pronunciation models. Ninety-five first-year Thai English majors were divided into an uninformed group, unaware of speakers’ nationalities, and an informed group, knowledgeable of the same. Participants listened to six speakers both native and non-native and rated them using a modified verbal guise technique before choosing the speaker(s) they think exemplify good pronunciation models. Knowledge of the speakers’ nationalities was found to influence the participants’ social ratings and their selection of speakers as pronunciation models. This study contributes to understanding how listeners’ language perception may be shaped by expectations about a speaker’s social identity rather than the speaker’s actual linguistic abilities. This study advocates the importance of English language teaching (ELT) in addressing the issue of RLS and its impact on language perception, calling educators to raise students’ understanding of stereotypical judgments of language variation and promote unbiased communication.
What exactly are NESTs in Thailand?: Understanding among Thai Students Regarding the Concept of ‘Native English Speaking Teachers’ in EFL Classrooms
Authors: Jitpaiboon Jenjira , Rungswang Atichat , Pin-ngern Atinuch
Published: February 2025

In Thailand, where students encounter both Native English-Speaking Teachers (NESTs) and Non-Native English Speaking Teachers (NNESTs)—with a significant portion of NNESTs being Thai and Filipino—a gap exists in understanding how Thai students interpret the terms Native English Speakers (NESs) and NESTs. This study aimed to explore this understanding among 279 Thai undergraduate students majoring in English, ranging from 1st to 4th year, focusing on their perceptions of countries considered as NES nations and using Kachru’s (1985) Three Concentric Model as a framework. It examined the relationship between students’ educational backgrounds and comprehension of these terms, as well as their expectations and experiences with NESTs and NNESTs. Data were collected via a mixed-methods approach, encompassing questionnaires and semi-structured group interviews, and analyzed using SPSS for statistical measures and AntConc for frequency analysis of questionnaire responses. Interview recordings were transcribed and analyzed for emerging themes. Key findings included that students identified countries from Kachru’s outer and expanding circles as NES nations, in addition to commonly recognized ones such as the US and the UK. The study highlighted a correlation between the students’ four-year education and their broader understanding of English. Moreover, this research found that students judge NESTs by their teaching skills and education quality rather than origin. This study underscores the importance of examining participants’ preconceptions of NESs and NESTs to enhance the accuracy of future research. It also suggests potential for further research, such as comparative studies with participants in NES countries.
Development of a New ‘Engineering English for Intercultural Communication’ Online Course to Prepare New Engineers for Working in Intercultural Workplace Settings
Authors: Janenoppakarn Chalida , Rajprasit Krich
Published: February 2025

This study aimed to develop a tailor-made online course called “Engineering English for Intercultural Communication (EEIC)” for undergraduate engineering students based on the self-report on English language proficiency, intercultural communication competence (ICC) as well as needs of a diverse set of stakeholders in the engineering professions and education. It comprises two phases: (1) analyzing the data from the stakeholders, and (2) designing and developing a course. In the first phase, a mixed-methods approach was adopted. A questionnaire was employed for a self-report on English language proficiency and problems in language use, as well as the ICC of 108 Thai engineering students at an autonomous university in Thailand and 22 Thai engineering professionals working in international companies. Then, semi-structured interviews on the necessity of engineering English and ICC for novice engineers were conducted with 16 engineering course lecturers. The second phase involves the design and development of the EEIC course. The ADDIE model was adopted and the findings from the analysis of the data collected in the first phase were used to guide the design and develop such a course with four units, each with a different focus, specifically. This study contributes to the ELT field by showcasing a course design process to meet the needs of a set of diverse stakeholders. Specifically, the course was developed based on real-life information obtained from both educational and professional contexts analyzed to provide guidance for the course design and development.
Factors Contributing to Speaking Anxiety and Anxiety Reduction Techniques in Thai adult EFL Learners
Authors: Suratin Natthakit , Sribayak Virasuda
Published: February 2025

The aim of the study was to identify the factors that contribute to speaking anxiety in Thai adult EFL learners working in an online media company and enrolled in an English course provided by the company, as well as to discover the anxiety reduction techniques used by these learners. The results showed that significant contributors to speaking anxiety among participants can be categorized into internal and external factors. Internally, a learner’s personality traits, such as self-inferiority, fear of making mistakes, lack of confidence, and their level of proficiency—including lack of vocabulary knowledge, grammatical inaccuracy, improper pronunciation, lack of skill in scriptwriting, and being unable to articulate things concisely—were major sources of anxiety. Externally, classroom activities, such as public speaking and impromptu speech activities, unclear explanations from teachers, and time constraints, also contributed to learners’ anxiety. This study also showed that learners employed various techniques to reduce their anxiety, including preparation, relaxation, positive thinking, peer thinking and task-focused. This underscores the importance for teachers and companies to provide a learning environment appropriate for adult EFL learners and to equip them with tools to create an atmosphere that is less anxiety-inducing.
The Effects of Task-Based Learning and Graphic Organizer Techniques on the Developing Student Teacher Professional Competency in Listening and Speaking Skills
Authors: Kositchaivat Suneeta
Published: February 2025

This study aims to evaluate the impact of task-based learning and graphic organizer techniques on enhancing student teacher professional competency in English listening and speaking skills. The study used a One-Group Pre-Test Post-Test Design, which involved 30 undergraduate math-major students in a Thai public university. Over eight weeks, the study group was instructed using teacher-prepared materials delivered through task-based learning and graphic organizer techniques. Pre- and post-tests were conducted to measure listening and speaking proficiency progression. In addition, the participants completed a self-evaluation form with professional competencies relating to listening and speaking before and after the study to measure the extent to which they have progressed. The results showed a significant improvement (p < 0.05) in listening and speaking proficiency, with learners advancing from beginner to independent user levels on the CEFR Global Scale. While most learners demonstrated substantial improvement, some showed moderate progress. This research emphasizes the potential of task-based learning and graphic organizer techniques as an effective method for tertiary-level undergraduate EFL student teachers. The findings offer valuable insights for designing and implementing language learning programs, emphasizing the importance of learner commitment and motivation. This study can serve as a practical guide for similar learner populations and provide implications for future language learning initiatives.
Upgrading English Public Speaking Skills in Thai EFL Students through Imitating TED Talks Videos
Authors: Sukrutrit Praweerata
Published: February 2025

This research investigates the enhancement of English public speaking skills among Thai EFL (English as a Foreign Language) students through imitating TED Talks videos. By applying Vygotsky's Zone of Proximal Development (ZPD) and Krashen's Input Hypothesis, the study integrates authentic materials for effective learning. A mixed methods approach, incorporating quantitative surveys, qualitative interviews and observation was used to assess students' perceptions and improvements in speaking skills. Fifty-five students from a government university in Northeastern Thailand participated in activities involving watching, imitating, and recording their own videos posted in a Facebook group. Results show significant improvements in vocabulary, grammar, body language, and overall speech structure. Students reported increased confidence and more engaging presentations. Initial challenges included understanding diverse accents and reliance on scripts, which decreased with practice. The study underscores the benefits of selective imitation over full imitation, allowing students to maintain individuality while acquiring new skills. These findings suggest that TED Talks are a valuable resource in English language teaching, fostering both linguistic and communicative development, and highlighting the importance of authentic materials and guided practice in language acquisition.
Determinants of L2 English Reading Proficiency among Thai Learners of English in Tertiary Education: A Multicomponent Perspective
Authors: Clarke Benjamin
Published: February 2025

Multicomponent perspectives on second language reading proficiency offer a contemporary understanding of reading and its development (e.g., Yamashita, 2022). In this web-based experiment, we investigated the relationship among L2 reading proficiency measures—reading comprehension, listening comprehension, reading fluency—and component reading skills in English, assessed through tests of vocabulary, grammar, and orthographic knowledge. A sample of 101 L2 learners from a Thai university participated, providing demographic and language background information and completing a survey regarding their motivation to perform well. As expected, reading and listening comprehension were strongly correlated. Moreover, a three-factor model emerged, with word-decoding skills, linguistic comprehension, and word-processing speed as latent constructs explaining just over half of the overall variance in L2 reading proficiency. Notably, component skills in English contributed more significantly to individual variability in reading and listening comprehension than to reading fluency. These findings suggest that while both comprehension and fluency are important facets of reading proficiency, a different set of skills may underlie reading fluency in a second language. The findings are discussed in relation to current theories of reading proficiency, with implications for L2 reading instruction considered.
Uncovering the Linguistic Issues in Tourism Promotional Texts: The Case of the Tourism Authority of Thailand's English Website
Authors: Chueasuai Pasakara
Published: February 2025

After the pandemic has ceased, high expectations have been raised for the tourism industry to generate quick and substantial income for Thailand as a remedy for the sluggish economy. The Tourism Authority of Thailand (TAT) plays a key role in informing and inviting foreign tourists to visit the country. TAT's official English website is another channel for the dissemination of tourism promotional texts (TPTs) to prospective visitors around the world. Quality TPTS are thus considered crucial not only for the provision of necessary information but also for the first impression of the country. This paper identifies linguistic issues found on the TAT's English website about the capital city of Bangkok and suggests revisions. The Bangkok webpage comprises 12 sub-menus, with a total of 232 sentences, all of which were used as data. Two assessors verified the analysed data to confirm the correct analysis. The study found syntactic and semantic issues at the word and sentence levels and stylistic issues at the sentence and paragraph levels. The syntactic flaw (79.22%) is found to be more problematic than the semantic one (20.78%). As for the stylistic mismatch, the TAT's English TPTs are not in line with the suggested web writing style consisting of the use of simple sentences, conciseness, one idea per paragraph, and the pyramid writing style. Basic revisions to maintain the original sentences were justified by an online English grammar checker QuillBot in order to improve the TPT's quality.
Digital Plagiarism in EFL Education during the AI Era: A Comparative Study of Perceptions among Learners and Instructors in Korea, Mongolia, and China
Authors: Shin Yousun , Wei Sun , Vanchinkhuu Narangerel
Published: February 2025

This study aimed at examining the issue of digital plagiarism within EFL education across Korea, Mongolia, and China in the era of Artificial Intelligence, focusing on how AI technologies affect academic integrity. It investigated both learners’ and instructors’ perceptions of digital plagiarism, shedding light on the impact of cultural and role-specific factors. The research utilized 11 scenario-based survey items, categorized by the extent of AI usage, from direct to indirect use. Through a quantitative analysis of these survey items, the study uncovered variances in perceptions of digital plagiarism not only between nationality groups but also between instructor and learner groups within particular cultures. The findings highlighted the imperative for explicit policies, ethical guidelines, and pedagogical strategies that are culturally attuned to confront digital plagiarism and uphold academic integrity, especially in L2 writing education.
Exploring the Lexical Approach for Vocabulary Learning Through AI-Driven Feedback
Authors: Tangpijaikul Montri
Published: February 2025

Despite the significant impact of the lexical approach for vocabulary learning, its classroom implementation has not been uniform. While related activities share the common Observe-Hypothesize-Experiment (OHE) elements, practitioners and researchers do not highlight how language input from the observing stage is turned into output and at what stage of learning it is likely to be most challenging for learners. The article reports on one classroom action research conducted on two groups of non-English-speaking university students. This present study investigates whether language proficiency plays a role and which stage of the OHE learning process deserves special attention. Different types of learning behaviors were found, and pedagogical implications that contribute to implementation of the approach are discussed. The paper argues that the OHE paradigm is not complete without immediate feedback, a component that has historically been impractical in formal EFL contexts and that AI-driven feedback should fill in the gap by enhancing the effectiveness of the lexical approach.
Voices Beyond Text: Unravelling Perceptions and Experiences of Thai Students with Visual Impairment using Microsoft’s Reading Progress - A Narrative Inquiry Approach
Authors: Attachoo Buarattana
Published: February 2025

Students with disabilities have been facing issues in English proficiency improvement and limitations in material accessibility. This, too, happens to Students with Visual Impairment (SVIs). However, as announced in the United Nations' commitment to create equity in inclusive education, particularly in SDG Goal 4, it is vital for educators to draw attention to this issue. This qualitative study explores the perceptions and experiences of SVIs using Microsoft's Reading Progress program to develop English reading skills, particularly fluency and pronunciation, at a university in Thailand. Through a narrative inquiry approach, six Thai undergraduate students with visual impairments (SVIs) were purposively selected to narrate their perceptions and experiences through semi-structured interviews on the program assisting SVIs with English reading skill improvement. The collected data were analyzed and categorized into six themes regarding Pronunciation Improvement, bridging the Gap between Silent Reading and Pronunciation, Enhancing other English skills, and The Role of Microsoft’s Reading Progress Program in Enhancing Confidence in English Reading. However, challenges were revealed in the areas of accessibility facilitating SVIs users. Lastly, additional experiences also emerged under the themes of Balance Between Pronunciation and Comprehension. The study's implications are beneficial for educational institutions and policymakers to take accessible learning solutions into account under the unique needs of students with visual impairment and, importantly, to enhance equity in inclusive education.
Reporting Verbs Used in In-Text Citations of EFL Undergraduate Students’ Theses: Focus on Surface Forms, Tenses, and Writer Stances
Authors: Rahayu Titik , Astuti Yuni , Zakiyah  , Cahyono Bambang Yudi
Published: February 2025

As an important practice for researchers, citing sources is a challenging task for undergraduate students as they deal with the types of citation forms, the variety of reporting verbs and their tenses, and the writer stances through reporting verbs. Therefore, the current research is aimed at investigating the surface forms, reporting verb tenses, and writer stances from the uses of reporting verbs. In total, the data sources included 30 theses written by undergraduate students of the English and Literature Program in one of the Indonesian state universities. The theses were taken randomly from the year of 2020 till 2022 by considering the data availability and accessibility. All sections of the thesis were analyzed by utilizing AntConc. The results indicated that an integral citation was preferable and most reporting verbs were shown in the present tense. In accordance with the reporting verbs, the students tended to endorse a source by using the words “state,” “mention,” and “explain” in the present tense. These results are different from those commonly shown by experts in their in-text citations. This implies that it is necessary to teach or advise undergraduate students to use various reporting verbs, tenses, and writer stances in in-text citation practices.
Trends in English Language Teaching Research among Thai Scholars: A Bibliometric Analysis of Scopus-Indexed Publications from 2010 to 2024
Authors: Suwanmanee Patcharapan , Mongkolhutthi Preechaya
Published: February 2025

This bibliometric study reveals the dominant research topics, methodologies, contexts, and publication outlets utilized by researchers in the field of English Language Teaching (ELT) in Thailand from 2010 to 2024. Bibliometric analysis was conducted using Microsoft Excel 2019 and VOSviewer 1.6.19 as research tools. The dataset was retrieved from 428 documents indexed in the SCOPUS database. The findings revealed that in addition to English as a Foreign Language (EFL) and English Language Teaching (ELT), the popular researched keywords include English for Specific Purposes (ESP), global Englishes, perceptions, English as a Lingua Franca (ELF), Covid-19, and Conversation Analysis (CA). The predominant research methodologies employed were qualitative and mixed-methods. The primary context of the study was higher education, followed by secondary and primary education. The top three publication outlets were LEARN Journal, rEFLections, and 3L: Language, Linguistics, Literature. These findings offer insights into the prevalent themes, methodologies, contexts, and publication outlets in the ELT research landscape in Thailand, providing essential information for educators, researchers, policymakers, and stakeholders in the ELT community.
Putting in the Last Piece: A Comprehensive Profiling of Learners’ Collocational Competence
Authors: Yue Zhiliang , Ruangjaroon Sugunya
Published: February 2025

This study aims to provide a comprehensive profile of collocational competence, a key component of one’s overall linguistic competence. For the maximum of ecological validity, we elicited naturalistic oral/written production data from 84 Chinese intermediate EFL learners and performed a 2×2 fashion of analysis on their performance in each of the six aspects, namely, collocation accuracy rate, collocation associative strength, collocation density, collocation diversity, and two relevant lexical levels. The findings not only show learners’ various inadequacies compared to native speakers, but also reveal the substantial discrepancies between their implicit and explicit collocational knowledge. Our result largely bears out Wray’s Dual Model, and some pedagogical implications are suggested accordingly, including a learning mode shift from bottom-up to top-down to remedy the situation.