bluuebunny/crossref_metadata_2025 huggingface dataset:
Lectura de pictogramas como estrategia didáctica para mejorar los problemas de lenguaje en los niños del nivel inicial
Authors: Bermeo Sinchi Janneth Esperanza , Pullaguari Uchuari Bélgica Lucía , Sanmartín González María Ruth , Curipoma Silva Gloria Esperanza
Published: June 2023

La presente investigación se ha titulado Lectura de pictogramas como estrategia didáctica para mejorar problemas de lenguaje en niños del nivel inicial, utilizando el diagrama PRISMA, encontrando un total de 518 documentos y finalmente se pudo terminar con 98 documentos que sirvieron para la sistematización de la información, luego se procesó la información obteniendo como resultado que el uso de lecturas pictográficas son aplicadas por parte de los docentes, por otro lado también se presentan los niveles de problemas del lenguaje los cuales fueron fonológico con un 34%, morfosintáctico con un 29% y semántico con un 38%.
Programa Educativo Efectos de la Suplementación de Hierro en Gestantes en el Centro de Salud Jangas
Authors: Rojas Tello Gilma Aly , Córdova Cassia Willy Edgardo , Olivares Cordova Jovanna Hasel , Norma Diaz Rojas Celedonia , Flores de Garcia Flora
Published: June 2023

Objetivo determinar los efectos de la Suplementación de Hierro diaria y semanal en Gestantes en el Centro de Salud de Jangas. Material y métodos: el tipo de investigación fue cuasi experimental, descriptiva, comparativo y prospectivo. La muestra de estudio estuvo constituida por 60 mujeres gestantes. El procesamiento de la información y analices se utilizó el programa SPSS versión 20.0. los resultados encontrados se observa en el grupo 1 de dosis diaria supervisada al inicio de la suplementación la gestante tuvieron 12,98 mg/dl y al final fue de 13,44 mg/dl, la diferencia fue estadísticamente significativo con un valor de p=0.000; grupo  2 dosis semanal supervisada el inicio fue de 13,21 mg/dl y al final del estudio fue de 13,55 mg/dl siendo esta diferencia estadísticamente significativa p=0.00;  el grupo 3 dosis diaria no supervisada al inicio fue de 13,19 mg/dl y al final descendió a 12,97 mg/dl siendo el valor de p=0,154 no teniendo ninguna diferencia significativa, respecto a los efectos colaterales se encontró el sabor metálico 60% y el estreñimiento 40%.fueron las molestias más frecuentes en las gestantes. Conclusión que al final del programa fue efectiva la suplementación de Hierro de dosis diaria supervisada fue eficaz la profilaxis a diferencia de dosis diaria no supervisada que no es adecuada la profilaxis, luego de haber recibido el programa educativa.
Plan de acción tutorial para el proceso enseñanza aprendizaje de un adolescente de 12 años con dificultades en el desarrollo lectoescritor
Authors: Pezo Galdea José Israel , Engracia Carvallo Dolores Edith , Serrano Santos María Cristina , Alfonzo Echeverría Verónica Jazmín
Published: June 2023

En la actualidad, las dificultades lectoescritoras se han convertido en uno de los principales trastornos del proceso enseñanza aprendizaje con incidencia en niños y adolescentes. La intervención oportuna y temprana de esta problemática con estrategias educativas, aumenta las posibilidades de obtener resultados positivos. Debido a aquello, se presenta el siguiente estudio “Plan de acción tutorial para el proceso enseñanza aprendizaje de un adolescente de 12 años con dificultades en el desarrollo lectoescritor”. Partiendo desde el enfoque cualitativo, se utilizaron los métodos teóricos y empíricos para realizar el diagnóstico del sujeto y determinar que entre las causas de las dificultades lectoescritoras se encuentra, primero, el factor biológico al presentar discapacidad leve y dificultades del lenguaje, y segundo, la falta de recursos pedagógicos de la institución educativa para desarrollar estrategias psicopedagogas de intervención. La información obtenida en el informe de diagnóstico será el fundamento principal para el desarrollo de un plan de acción tutorial, que tendrá actividades pedagógicas diseñadas acorde a las necesidades del objeto de estudio, por lo cual su implantación es necesaria.
Psicología Educativa
Authors: Enríquez Chuga Ruth Gabriela , González Saborit Maité , Muñoz Navarro María Paulina , Narváez Jaramillo Hugo Jonathan
Published: June 2023

La asignatura de psicología educativa corresponde a la unidad de organización profesional de la carrera de Desarrollo Integral del Niño cuyo objetivo está encaminado a innovar y producir una transformación en procesos en el ámbito educativo, generar experiencias de aprendizaje significativas y oportunas considerando el contexto familiar y sociocultural. De manera secuencial en cada unidad de estudio el alumno analiza con criterio científico el origen de la psicología educativa y el aporte que brinda al campo de la educación, fundamenta los principios básicos sobre los cuales se sustenta las teorías del aprendizaje y su aplicación dentro de la educación, aplica aprendizajes significativos mediante la búsqueda de sus características, principios y motivaciones para su aplicación en el aula, potencializa el desarrollo de niños y niñas respetando sus diferencias individuales para finalmente reconocer la importancia de la psicología educativa en su formación profesional. Dentro del campo profesional la asignatura pretende que el estudiante conozca la importancia que tiene los procesos de aprendizaje y enseñanza dentro de los centros educativos, destacando procesos de auto organización del aprendizaje, en aras de estimular el desarrollo y la autonomía del alumno, por medio de la crítica y la creatividad de los estudiantes quienes estarán en condiciones de potenciar las formas más eficaces de aprender la conceptualización de lo que es la Psicología Educativa, de describir los tipos de aprendizaje, de definir los postulados de las Teorías de Aprendizaje de manera práctica expone la naturaleza, las características y la evaluación del proceso de enseñanza aprendizaje, tomando en cuenta las diversas condiciones en las que se realiza, sustentado en los nuevos paradigmas educativos y psicopedagógicos que optimizan la adquisición de competencias y aprendizajes significativos de los educandos. El aprendizaje a través de la historia ha sido en el ser humano una necesidad de descubrir las leyes y causas que rigen la conducta de los individuos en torno al proceso de enseñanza – aprendizaje. Cada individuo posee una combinación única de atributos mentales, emocionales, físicos y sociales las cuales le hace ser un sujeto único y diferente a los demás por lo que su labor debe ir encaminada a distinguir las posibles diferencias que tiene un alumno, aplicando estrategias para manejar los eventuales problemas en beneficio de los estudiantes. Una vez descrita la importancia de la signatura y los objetivos fundamentales de estudio se desea éxitos a los estudiantes durante el presente semestre y de manera general en el camino por recorrer para el alcance de su meta profesional.
Free Convection of Viscoelastic Nanofluid Flow on a Horizontal Circular Cylinder with Constant Heat Flux
Authors: Rahimah Mahat  , Sharidan Shafie  , Imran Ullah
Published: June 2023

The current research study is focusing on a mathematical model for free convection boundary flow on a horizontal circular cylinder in a viscoelastic nanofluid has been constructed in this paper with boundary conditions constant heat flux. The Tiwari and Das Nanofluid model have been chosen in this analysis to investigate more nanofluid effects. A dimensionless set of partial differential equations is formed by using suitable non-dimensional variables. The transformed boundary layer equations are solved numerically using a finite difference scheme namely the Keller-box method. The effects of a few chosen factors on flow and heat transmission are investigated. Numerical solutions were obtained for the reduced skin friction coefficient, Nusselt number and Sherwood number as well as the velocity and temperature profiles. The features of the flow and heat transfer characteristics for various values of the viscoelastic parameter and nanoparticles volume fraction were analysed and discussed.
Global Research Hotspots and Trends in Halal Research: A Scientometric Review Based on Descriptive and CiteSpace Analyses
Authors: Nor Nadiha Mohd Zaki  , Mohd Nizam Lani  , Mohamad Nor Azra  , Mohd Iqbal Mohd Noor  , Rozila Alias  , Nor Ainy Mahyudin  , Amalia Mohd Hashim  , Mohd Nasir Mohd Desa
Published: June 2023

The halal industry is growing, and there is an increasing recognition of its importance among academics, practitioners, and other industry stakeholders. However, there is limited scientometric research using CiteSpace analysis on halal research. This study is the first to report on scientometric research that used CiteSpace analysis to identify the extent of halal publications. The Web of Science Core Collection databases were queried, and CiteSpace was used for co-citation analysis, while Microsoft Excel was used for descriptive analysis. Our analysis included 1139 publications available in WOSCC between 1987 and 2021. We found a fifteen-fold increase in halal-related publications between 2010 (10) and 2021 (150). Malaysia (37%) and Indonesia (15%) were the top two countries with combined publications more than 50% of published papers. Our literature co-citation cluster analysis identified eleven clusters, with the most prominent being halal tourism, halal certification, pig adulteration, and halal logistics. The major fields with the highest number of halal-related publications were: (i) “Veterinary, Animal Science”, (ii) “Psychology, Education, Health”; and (iii) “Economics, Economic, Political”. Scientometric analysis of halal research can identify the focal points and frontiers of the field. This study offers valuable theoretical and real-world references, recent developments, and opportunities for collaboration.
Development of Power Transformer Health Index Assessment Using Feedforward Neural Network
Authors: Azmi Murad Abd Aziz  , Mohd Aizam Talib  , Ahmad Farid Abidin  , Syed Abdul Mutalib Al Junid
Published: June 2023

The role of a power transformer is to convert the electrical power level and send it to the consumer, making it an essential component of a power system. In addition, transformer asset management is essential for monitoring the functioning of transformers in the system to prevent failure and anticipating the health state of transformers, using a technique known as the health index (HI). However, the calculation and computation to determine the transformer HI based on a scoring and ranking technique is complex and required expert validation. Therefore, this paper presents a transformer HI prediction using a feedforward neural network (FFNN) to improve the existing complex scoring and ranking technique. Levenberg–Marquardt (LM), Bayesian Regularized (BR), and Scaled Conjugate Gradient (SCG) are the FFNN training techniques presented in this study to forecast the transformer HI. To validate the techniques, the HI values generated by different FFNN techniques were compared to the scoring and ranking system. Then, the performance of the proposed ANN was evaluated using the correlation coefficient and mean square error (MSE). As a result, the transformer HI was successfully predicted by employing three FFNN techniques, namely the LM, BR, and SCG techniques, which were able to determine whether the transformer's condition is very good, good, fair, or poor. In conclusion, the ANN suggested in this study has also been validated with the ranking and scoring approach, which provides high similarity score in comparison to the transformer health index.
Stability Analysis of Competition Model of iOS and Android
Authors: Nurul Syaza Abdul Latif  , Mohamed Hafizi Mohamed Nawi  , Nurin Nazifa Md Nasir  , Ratna Herdiana
Published: June 2023

iOS and Android are among the most used phone operating systems nowadays, and their existence and individual performance will heavily affect each other in the short and long term. In order to dominate the market or to engage in a healthy competition where both populations (iOS and Android) can coexist without harming one another, both populations must be aware of one another's performance and respond to it appropriately. Hence, this study aims to analyse the stability of the previous model competition between iOS and Android, which used the Lotka-Volterra model. The steady-state stability was analysed using the Jacobian matrix, and its phase portraits were plotted using the online tool. Besides that, parameter sensitivity analysis was carried out by varying different values for parameters presented in the equations to observe how the differences in parameters affected the dynamics of the relationship, which directly exhibits the effect of individual population performance and how it affects longevity and survival of the other populations in the system. In conclusion, this study has given us a better understanding of the dynamics of competition between iOS and Android in the current market.
IMPACT OF BLOCKCHAIN TECHNOLOGY ON THE OPERATIONAL EFFICIENCY OF CROWDFUNDING PLATFORMS
Authors: Venslavienė Santautė , Stankevičienė Jelena , Leščauskienė Ingrida
Published: June 2023

Recently, crowdfunding platforms have become more attractive because of their advantages comparing to traditional funding sources. Nevertheless, the further potential of crowdfunding platforms development remains unclear due to worries related to reliability, transparency and trustworthiness as well as limitations attracting investments. Employing an online survey approach and questioning the targeted experts, the most important criteria for blockchain technology implementation into crowdfunding platforms were discussed. A VAS (visual analogue scale) matrix for criteria weighting (VASMA weighting) methodology was chosen to find out the main factors that affect crowdfunding platforms the most when implementing blockchain technology. The main findings reveal that Cybersecurity risks, no specific laws to respect all terms of funding and Complex cryptocurrency regulations are the most important for the crowdfunding platforms employees. Accordingly, this study identifies both benefits through blockchain technology and barriers of the application of blockchain technology in terms of legal requirements and development costs.
KNOWLEDGE, ATTITUDE AND BEHAVIOUR TOWARD INVESTMENTS: PILOT STUDY ON LATVIAN SAMPLE
Authors: Titko Jelena , Bistrova Julija , Uzule Kristine , Verina Natalja , Budanceva Jelena
Published: June 2023

This paper reflects the results of the pilot research within the series of studies aimed at evaluating the level of knowledge about financial investments among Latvian citizens, perceived complexity of the investments-related issues, attitudes towards financial products, savings, and investments, as well as at getting a general insight about citizens’ investment behaviour. The goal of the pilot research was to evaluate the perceived complexity of the investments-related questions, as well as to get an insight about the motives and barriers to start investing. The sample included 300 respondents. The survey was made using the authors’ developed questionnaire; the data was processed by means of the frequency analysis. To analyze open-ended questions consistent with the discourse analysis methodology, the openaccess software AntConc was used. Most difficult questions for respondents were those about bonds. Most respondents treat their knowledge about investments at the below-average level. Lack of free financial resources was mentioned as the most important barrier for making investments by 35% of respondents.
A Wide View of the Galactic Globular Cluster NGC 2808: Red Giant and Horizontal Branch Star Spatial Distributions
Authors: Johnson Christian I. , Calamida Annalisa , Kader Justin A. , Ferraro Ivan , Pilachowski Catherine A. , Bono Giuseppe , Mastrobuono-Battisti Alessandra , Rest Armin , Zenteno Alfredo , Zocchi Alice
Published: June 2023

Wide-field and deep DECam multiband photometry, combined with HST data for the core of the Galactic globular cluster NGC 2808, allowed us to study the distribution of various stellar subpopulations and stars in different evolutionary phases out to the cluster tidal radius. We used the C

ugi
= (u − g) − (g − i) index to identify three chemically distinct subpopulations along the red giant branch and compared their spatial distributions. The most light-element-enriched subpopulation (P3) is more centrally concentrated; however, it shows a more extended distribution in the external regions of the cluster compared to the primordial (P1) and intermediate (P2) composition populations. Furthermore, the P3 subpopulation centroid is off-center relative to those of the P1 and P2 groups. We also analyzed the spatial distribution of horizontal branch stars and found that the relative fraction of red horizontal branch stars increases for radial distances larger than ≈1.′5, while that of the blue and hotter stars decreases. These new observations, combined with literature spectroscopic measurements, suggest that the red horizontal branch stars are the progeny of all the stellar subpopulations in NGC 2808, i.e., primordial and light-element enhanced, while the blue stars are possibly the result of a combination of the “hot-flasher” and the “helium-enhanced” scenarios. A similar distribution of different red giant branch subpopulations and horizontal branch stars was also found for the most massive Galactic globular cluster, ω Cen, based on combined DECam and HST data, which suggests that the two may share a similar origin.
Observable Signature of Merging Stellar-mass Black Holes in Active Galactic Nuclei
Authors: Tagawa Hiromichi , Kimura Shigeo S. , Haiman Zoltán , Perna Rosalba , Bartos Imre
Published: June 2023

The origin of stellar-mass black hole mergers discovered through gravitational waves is being widely debated. Mergers in the disks of active galactic nuclei (AGNs) represent a promising source of origin, with possible observational clues in the gravitational-wave data. Beyond gravitational waves, a unique signature of AGN-assisted mergers is electromagnetic emission from the accreting black holes. Here we show that jets launched by accreting black holes merging in an AGN disk can be detected as peculiar transients by infrared, optical, and X-ray observatories. We further show that this emission mechanism can explain the possible associations between gravitational-wave events and the optical transient ZTF 19abanrhr and the proposed gamma-ray counterparts GW150914-GBM and LVT151012-GBM. We demonstrate how these associations, if genuine, can be used to reconstruct the properties of these events’ environments. Searching for infrared and X-ray counterparts to similar electromagnetic transients in the future, once host galaxies are localized by optical observations, could provide a smoking-gun signature of the mergers’ AGN origin.
Modeling Chondrule Dust Rim Growth with Ellipsoidal Monomers
Authors: Xiang C. , Carballido A. , Matthews L. S. , Hyde T. W.
Published: June 2023

Fine-grained dust rims (FGRs) surrounding chondrules in carbonaceous chondrites encode important information about early processes in the solar nebula. Here, we investigate the effect of the nebular environment on FGR porosity, dust size distribution, and grain alignment, comparing the results for rims comprised of ellipsoidal and spherical grains. We conduct numerical simulations in which FGRs grow by collisions between dust particles and chondrules in both neutral and ionized turbulent gas. The resultant rim morphology is related to the ratio ϵ of the electrostatic potential energy at the collision point to the relative kinetic energy between colliding particles. In general, large ϵ leads to a large rim porosity, large rim grain size, and low growth rate. Dust rims comprised of ellipsoidal monomers initially grow faster in thickness than rims comprised of spherical monomers, due to their higher porosity. As the rims grow and obtain a greater electrostatic potential, repulsion becomes dominant, and this effect is reversed. Grain size coarsening toward the outer regions of the rims is observed for low- and high-ϵ regimes, and is more pronounced in the ellipsoidal case, while for the medium-ϵ regime, small monomers tend to be captured in the middle of the rims. In neutral environments, ellipsoidal grains have random orientations within the rim, while in charged environments ellipsoidal grains tend to align with maximum axial alignment for ϵ = 0.15. The characterization of these FGR features provides a means to relate laboratory measurements of chondrite samples to the formation environment of the parent bodies.
Surveying Flux Density in Galaxies with Apparent Large Black Holes at Millimeter/Submillimeter Wavelengths
Authors: Lo Wen-Ping , Asada Keiichi , Matsushita Satoki , Pu Hung-Yi , Nakamura Masanori , Bower Geoffrey C. , Park Jongho , Inoue Makoto
Published: June 2023

We present millimeter and submillimeter continuum observations for 36 sources with potentially large black hole shadows at 230 and 345 GHz using the Submillimeter Array. The sources are selected based on the criterion of the large diameter of the black hole shadows. Our motivation is to explore the nature of the accretion flow of the potential candidates of low-luminosity active galactic nuclei (LLAGNs) through photometry at millimeter/submillimeter wavelengths. The detected result serves as the pathfinder of future high-angular resolution observations such as the Event Horizon Telescope. As a result, we successfully detected 17 and eight sources at 230 and 345 GHz, respectively. We reveal that three of the detected sources (IC 310, NGC 1277, and NGC 5846) show significant excess at millimeter/submillimeter wavelengths in comparison with the extrapolation both from low-frequency radio and infrared, which are considered to be attributed to the extended jet and dust component, respectively. One possible explanation is that these excesses are associated with the hot accretion flow onto the supermassive black holes of the LLAGNs. By adopting the advection-dominated accretion flow model's semi-analytic model, we obtained the upper bound of the mass accretion rate. Those are less than 10−2

M

̇

EDD

, where

M

̇

EDD

is the Eddington mass accretion rate computed via the Eddington luminosity. This is in good agreement with the expected range of the LLAGNs. The ∼200 mJy flux densities and negative spectral index of IC 1459 within millimeter and submillimeter wavelengths make it a promising candidate for future submillimeter high-angular resolution experiments for imaging the black hole shadow.
Triple Evolution: An Important Channel in the Formation of Type Ia Supernovae
Authors: Rajamuthukumar Abinaya Swaruba , Hamers Adrian S. , Neunteufel Patrick , Pakmor Rüdiger , de Mink Selma E.
Published: June 2023

Type Ia supernovae (SNe Ia) are thought to be the result of thermonuclear explosions in white dwarfs (WDs). Commonly considered formation pathways include two merging WDs (the double-degenerate channel) and a single WD accreting material from a H or He donor (the single-degenerate channel). Since the predicted SN Ia rates from WDs in binaries are thought to be insufficient to explain the observed SN Ia rate, it is important to study similar interactions in higher-order multiple-star systems such as triple systems. We use the evolutionary population synthesis code Multiple Stellar Evolution (MSE) to study the stellar evolution, binary interactions, and gravitational dynamics of the triple-star systems. Also, unlike previous studies, prescriptions are included to simultaneously take into account the single- and double-degenerate channels, and we consider triples across the entire parameter space (including those with tight inner binaries). We explore the impact of typically ignored or uncertain physics such as flybys and common envelope prescription parameters on our results. The majority of systems undergo circular mergers to explode as SNe Ia, while eccentric collisions contribute to 0.4%−4% of SN Ia events. The time-integrated SN Ia rate from the triple channel is found to be

(
3.60
±
0.04
)
×

10

−
4

M

⊙

−
1

, which is, surprisingly, similar to that of the isolated binary channel, where the SN Ia rate is

(
3.2
±
0.1
)
×

10

−
4

M

⊙

−
1

. This implies that triples, when considering their entire parameter space, yield an important contribution to the overall SN Ia rate.
CEERS: Spatially Resolved UV and Mid-infrared Star Formation in Galaxies at 0.2 < z < 2.5: The Picture from the Hubble and James Webb Space Telescopes
Authors: Shen Lu , Papovich Casey , Yang Guang , Matharu Jasleen , Wang Xin , Magnelli Benjamin , Elbaz David , Jogee Shardha , Alavi Anahita , Arrabal Haro Pablo , Backhaus Bren E. , Bagley Micaela B. , Bell Eric F. , Bisigello Laura , Calabrò Antonello , Cooper M. C. , Costantin Luca , Daddi Emanuele , Dickinson Mark , Finkelstein Steven L. , Fujimoto Seiji , Giavalisco Mauro , Grogin Norman A. , Guo Yuchen , Holwerda Benne W. , Kartaltepe Jeyhan S. , Koekemoer Anton M. , Kurczynski Peter , Lucas Ray A. , Pérez-González Pablo G. , Pirzkal Nor , Prichard Laura , Rafelski Marc , Ronayne Kaila , Simons Raymond C. , Sunnquist Ben , Teplitz Harry I. , Trump Jonathan R. , Weiner Benjamin J. , Windhorst Rogier A. , Yung L. Y. Aaron
Published: June 2023

We present the mid-infrared (MIR) morphologies for 64 star-forming galaxies (SFGs) at 0.2 < z < 2.5 with stellar mass M
* > 109
M
⊙ using James Webb Space Telescope (JWST) Mid-Infrared Instrument (MIRI) observations from the Cosmic Evolution Early Release Science survey. The MIRI bands span the MIR (7.7–21 μm), enabling us to measure the effective radii (R
eff) and Sérsic indexes of these SFGs at rest-frame 6.2 and 7.7 μm, which contains strong emission from Polycyclic aromatic hydrocarbon (PAH) features, a well-established tracer of star formation in galaxies. We define a “PAH band” as the MIRI bandpass that contains these features at the redshift of the galaxy. We then compare the galaxy morphologies in the PAH bands to those in the rest-frame near-ultraviolet (NUV) using Hubble Space Telescope (HST) Advanced Camera for Surveys (ACS)/F435W or ACS/F606W and optical/near-IR using HST WFC3/F160W imaging from UVCANDELS and CANDELS. The R
eff of galaxies in the PAH band are slightly smaller (∼10%) than those in F160W for galaxies with M
* ≳ 109.5
M
⊙ at z ≤ 1.2, but the PAH band and F160W have similar fractions of light within 1 kpc. In contrast, the R
eff of galaxies in the NUV band are larger, with lower fractions of light within 1 kpc compared to F160W for galaxies at z ≤ 1.2. Using the MIRI data to estimate the SFRIR surface density, we find that the correlation between the SFRIR surface density and stellar mass has a steeper slope than that of the SFRUV surface density and stellar mass, suggesting more massive galaxies having increasing amounts of obscured fraction of star formation in their inner regions. This paper demonstrates how the high-angular resolution data from JWST/MIRI can reveal new information about the morphology of obscured star formation.
Resonant Mode Coupling in δ Scuti Stars
Authors: Mourabit Mohammed , Weinberg Nevin N.
Published: June 2023

Delta Scuti (δ Sct) variables are intermediate-mass stars that lie at the intersection of the main sequence and the instability strip on the Hertzsprung–Russell diagram. Various lines of evidence indicate that nonlinear mode interactions shape their oscillation spectra, including the particularly compelling detection of resonantly interacting mode triplets in the δ Sct star KIC 8054146. Motivated by these observations, we use the theory of three-mode coupling to study the strength and prevalence of nonlinear mode interactions in 14 δ Sct models that span the instability strip. For each model, we calculate the frequency detunings and nonlinear coupling strengths of ∼104 unique combinations of mode triplets. We find that all the models contain at least ∼100 well-coupled triplets whose detunings and coupling strengths are consistent with the triplets identified in KIC 8054146. Our results suggest that resonant mode interactions can be significant in δ Sct stars and may explain why many exhibit rapid changes in amplitude and oscillation period.
Burden of pulmonary tuberculosis and challenges related to tuberculosis detection in Ethiopia
Authors: Weldemhret Letebrhan
Published: June 2023

Early and rapid diagnosis of Mycobacterium tuberculosis in clinical specimen is important for the treatment of patients and control of disease transmission to the community. The disease is largely preventable and curable, but without rapid, and correct diagnostic tools for tuberculosis (TB) infection and drug resistance, it is unlikely that we can meet the national TB elimination program in Ethiopia by 2035. Moreover, drug resistant TB is becoming more common and is a great challenge for the successful control and eradication of TB. The need for rapid, accurate and affordable methods for TB management should be considered by policy makers to improve TB detection rate and reduction of TB related deaths in line with the stop TB strategy by 2030 in Ethiopia.
Clinical utility of universal 16S rRNA PCR using sterile body fluids: lung abscess caused by Nocardia farcinica
Authors: Park Jungseo , Seo Jun-Won , Yoon Na Ra , Kim Dong-Min , Kim Choon-Mee
Published: June 2023

Nocardiosis is an infectious disease caused by Gram-positive rod-shaped bacteria and presents as a suppurative granulomatous disease in patients with compromised immune systems. Few studies have investigated the clinical utility of the universal 16S rRNA polymerase chain reaction (PCR) method using sterile body fluids for diagnosing nocardiosis.
A 64-year-old female patient was admitted to Chosun University Hospital with the complaint of fever. Computed tomography scans of her chest revealed the presence of empyema and an abscess in the right lung. Pus samples were collected using closed chest thoracostomy and were cultured. The results revealed the presence of Gram-positive bacilli, but the culture tests were unable to identify the causative microorganism. Despite antibiotic treatment, the patient died of the suspected empyema and abscess. Universal 16S PCR of her sterile body fluids in combination with sequencing was performed, which led to the diagnosis of Nocardia farcinica infection. Postmortem, the remainder of the pus samples cultured for 8 days confirmed the presence of N. farcinica. This study illustrates the importance of using routine universal 16S rRNA PCR with sterile body fluids to help diagnose atypical bacterial infections such as nocardiosis.
Adherence to standard precautions by nursing professionals in a public university hospital: a cross-sectional study
Authors: Diniz Maiara Oliveira , Ferreira Adriano Menis , Andrade Denise de , Watanabe Evandro , Schneider Guilherme , Santos André Pereira dos , Valim Marilia Duarte , Santos Bruno da Silva , Souza Mônia Alves Mendes de , Vaz Emileide dos Santos Almeida
Published: June 2023

Introduction: The aim of this study was to analyze the adherence to standard precautions by nursing professionals in a public university hospital, and to identify associated factors.
Methodology: This was a cross-sectional study with the nursing staff of a public university hospital. The participants provided sociodemographic and immunization data, training data on standard precautions and occupational accident history, and responded to the questionnaire on adherence to standard precautions (QASP). Descriptive data analysis and Pearson’s Chi-square test (χ²) were performed, followed by Fisher’s exact test to verify the association between the adherence to standard precautions (total score ≥ 76 points) and the sample characterization variables. Additionally, binary logistic regression indicated the odds ratio (OR) of the sample characterization variables for adherence to standard precautions. A p value ≤ 0.05 was considered statistically significant.
Results: The average score for adherence to standard precautions, through QASP, by nursing professionals evaluated was 70.5 points. Association between the adherence to standard precautions and the professionals’ sample characterization variables was not identified. However, it was observed that experienced professionals (≥15 years of experience in the institution) were more likely to adhere to standard precautions (OR 0.062; IC95% [0.006-0.663]; p = 0.021).
Conclusions: In general, the adherence to standard precautions by nursing professionals working in health service in this study can be considered inadequate, highlighting major weaknesses in hand hygiene practices, use of personal protective equipment (PPE), recapping of used needles, and conduct after suffering occupational accidents. Experienced professionals were more likely to adhere to standard precautions.
Cryptococcal meningitis post-covid-19 infection: Immunomodulation, a double-edged sword
Authors: Abdessamad Hilal W , Achkar Michel , Al Zoghbi Amal , Fleifel Mohamad , Ousta Abdul Rahman , Kassar Ahmad , Samaha Nadia L , Nemr Rita , Farra Anna , Mokhbat Jacques E , Husni Rola
Published: June 2023

Cryptococcal meningitis is an opportunistic infection associated with altered immunity. Immunomodulatory agent use in severe coronavirus disease 2019 (COVID-19) may predispose such infections. Here, we present a 75-year-old male patient who presented with fever and altered general status after severe COVID-19 infection and developed cryptococcal meningitis. Opportunistic infection may arise from the use of immunomodulation in severe COVID-19, especially in the elderly population. This article describes the case and extensively reviews cryptococcal disease post-COVID-19 literature, highlighting the risk from immunosuppressive treatment.
Antibiotic resistance assessment and multi-drug efflux pumps of Enterococcus faecium isolated from clinical specimens
Authors: Mirzaii Mehdi , Alebouyeh Masoud , Sohrabi Mohammad Bagher , Eslami Parisa , Fazli Mojgan , Ebrahimi Maryam , HajiAsgarli Parinaz , Rashidan Marjan
Published: June 2023

Introduction: Enterococcus faecium is a major cause of community and hospital-acquired infections. Due to limited options for infection with fluoroquinolones-resistant Enterococci, novel therapeutics are urgently needed. Efflux pumps are contributed to fluoroquinolones resistance phenotype in this bacterium and novel inhibitors that target these efflux pumps could be effective in patients. In this research, the possible synergistic effect of an efflux pump inhibitor (EPI), thioridazine, with ciprofloxacin was investigated against clinical isolates of E. faecium.
Methodology: A total of 88 isolates of E. faecium from clinical specimens were studied from August 2017 to September 2018. Conventional phenotypic and molecular methods characterized all the isolates. Standard susceptibility tests and molecular assays determined the antibiotic resistance profiles and the frequency of efflux pump genes. Minimum inhibitory concentrations (MICs) to ciprofloxacin (CIP) in the presence and absence of thioridazine were measured by the micro-broth dilution method.
Results: The highest antibiotic resistance rate among E. faecium isolates was related to ciprofloxacin (96.8%), levofloxacin (94.3%), and imipenem (90.9%), respectively. The highest frequency of efflux pump determinants was related to efmA (60, 68%), followed by emeA (48, 54.5%), and efrA and/or efrB genes (45, 51%). The efflux pump inhibitor showed ≥ 2-fold decrease in the MIC value of ciprofloxacin in 48.2% of the isolates.
Conclusions: Efflux pump inhibitor genes efrAB, efmA, and emeA are common among the E. faecium clinical isolates. Our results supported the administration of thioridazine, as an efflux pump inhibitor, in fluoroquinolone-resistant E. faecium infections due to its synergistic effect with CIP.
New record of Chromis weberi (Actinopterygii: Ovalentaria: Pomacentridae) from Jeju Island, southern Korea
Authors: Myoung Se Hun , Myoung Jung-Goo , Woo Min-Su , Kim Maeng Jin , Kang Min Gu , Park Joo Myun
Published: June 2023

Discovering tropical marine species outside of their distribution limits is important for evaluating the impact of climate change on marine ecosystems. One specimen (31.6 mm standard length) of a tropical fish, Chromis weberi Fowler et Bean, 1928, representing the family Pomacentridae, was first recorded from Jeju Island, Korea, on 8 December 2021. It was characterized by black posterior margins of the preopercle and opercle and black upper and lower lobes of the caudal fin. A specimen of this species collected from Munseom was distinguished from Chromis xanthura (Bleeker, 1854) based on distinct differences in the tips of the upper and lower caudal fin lobes, which are not black in C. xanthura. In addition, C. weberi was easily distinguished from the other four species in the genus Chromis, by the mitochondrial DNA cytochrome c oxidase subunit I gene sequence (345 bp), with genetic distances ranging from 0.130 to 0.252. This study documents the first record of C. weberi in temperate Korean waters, implying a poleward range expansion for this species. The Korean name ‘geom-eun-jeom-ggo-ri-ja-ri-dom’ has been proposed for C. weberi.
Développement durable et environnement
Authors: Degron Robin
Published: June 2023

Dans le cadre de l’ONU, dix-sept Objectifs de développement durable (ODD) ont été établis en 2015 avec un horizon de réalisation à 2030. Ils prennent en compte le fait que la notion de développement s’est mitigée depuis les années 1990 de préoccupations environnementales. Mais ces objectifs, de nature globale, suscitent de nombreuses questions dans un monde caractérisé par des réalités géographiques diversifiées. Prennent-ils en compte la diversité des civilisations ? Les approches différenciées de la notion d’égalité ? La variété des échelles géographiques ? Parviennent-ils à résoudre les enjeux des interactions entre ces dix-sept objectifs ? Ne mettent-ils pas en évidence des contradictions géopolitiques ? L’examen des réponses à ces questions permet d’éclairer sur les possibilités d’appliquer une même grille d’analyse du développement durable dans tous les pays du Monde.
The Sombor index and coindex of two-trees
Authors: Du Zenan , You Lihua , Liu Hechao , Huang Yufei
Published: June 2023

The Sombor index of a graph $ G $, introduced by Ivan Gutman, is defined as the sum of the weights $ \sqrt{d_G(u)^2+d_G(v)^2} $ of all edges $ uv $ of $ G $, where $ d_G(u) $ denotes the degree of vertex $ u $ in $ G $. The Sombor coindex was recently defined as $ \overline{SO}(G) = \sum_{uv\notin E(G)}\sqrt{d_G(u)^2+d_G(v)^2} $. As a new vertex-degree-based topological index, the Sombor index is important because it has been proved to predict certain physicochemical properties. Two-trees are very important structures in complex networks. In this paper, the maximum and second maximum Sombor index, the minimum and second minimum Sombor coindex of two-trees and the extremal two-trees are determined, respectively. Besides, some problems are proposed for further research.
Some common fixed point theorems in bipolar metric spaces and applications
Authors: Paul Joginder , Sajid Mohammad , Chandra Naveen , Gairola Umesh Chandra
Published: June 2023

In this article, we prove some common fixed point theorems for generalized rational type contractions in bipolar metric spaces. These theorems also generalize and extend several interesting results of metric fixed point theory to the bipolar metric context. In addition, we provide some examples to illustrate our theorems, and applications are obtained in areas of homotopy theory and integral equations by using iterative methods for mathematical operators on a bipolar metric space.
Hopf bifurcation in a chronological age-structured SIR epidemic model with age-dependent infectivity
Authors: Kuniya Toshikazu , Inaba Hisashi
Published: June 2023

In this paper, we examine the stability of an endemic equilibrium in a chronological age-structured SIR (susceptible, infectious, removed) epidemic model with age-dependent infectivity. Under the assumption that the transmission rate is a shifted exponential function, we perform a Hopf bifurcation analysis for the endemic equilibrium, which uniquely exists if the basic reproduction number is greater than $ 1 $. We show that if the force of infection in the endemic equilibrium is equal to the removal rate, then there always exists a critical value such that a Hopf bifurcation occurs when the bifurcation parameter reaches the critical value. Moreover, even in the case where the force of infection in the endemic equilibrium is not equal to the removal rate, we show that if the distance between them is sufficiently small, then a similar Hopf bifurcation can occur. By numerical simulation, we confirm a special case where the stability switch of the endemic equilibrium occurs more than once.
Entropy-based reliable non-invasive detection of coronary microvascular dysfunction using machine learning algorithm
Authors: Zhao Xiaoye , Gong Yinlan , Xu Lihua , Xia Ling , Zhang Jucheng , Zheng Dingchang , Yao Zongbi , Zhang Xinjie , Wei Haicheng , Jiang Jun , Liu Haipeng , Mao Jiandong
Published: June 2023

Purpose

Coronary microvascular dysfunction (CMD) is emerging as an important cause of myocardial ischemia, but there is a lack of a non-invasive method for reliable early detection of CMD.

Aim

To develop an electrocardiogram (ECG)-based machine learning algorithm for CMD detection that will lay the groundwork for patient-specific non-invasive early detection of CMD.

Methods

Vectorcardiography (VCG) was calculated from each 10-second ECG of CMD patients and healthy controls. Sample entropy (SampEn), approximate entropy (ApEn), and complexity index (CI) derived from multiscale entropy were extracted from ST-T segments of each lead in ECGs and VCGs. The most effective entropy subset was determined using the sequential backward selection algorithm under the intra-patient and inter-patient schemes, separately. Then, the corresponding optimal model was selected from eight machine learning models for each entropy feature based on five-fold cross-validations. Finally, the classification performance of SampEn-based, ApEn-based, and CI-based models was comprehensively evaluated and tested on a testing dataset to investigate the best one under each scheme.

Results

ApEn-based SVM model was validated as the optimal one under the intra-patient scheme, with all testing evaluation metrics over 0.8. Similarly, ApEn-based SVM model was selected as the best one under the intra-patient scheme, with major evaluation metrics over 0.8.

Conclusions

Entropies derived from ECGs and VCGs can effectively detect CMD under both intra-patient and inter-patient schemes. Our proposed models may provide the possibility of an ECG-based tool for non-invasive detection of CMD.
The fourth-order total variation flow in $ \mathbb{R}^n $
Authors: Giga Yoshikazu , Kuroda Hirotoshi , Łasica Michał
Published: June 2023

We define rigorously a solution to the fourth-order total variation flow equation in $ \mathbb{R}^n $. If $ n\geq3 $, it can be understood as a gradient flow of the total variation energy in $ D^{-1} $, the dual space of $ D^1_0 $, which is the completion of the space of compactly supported smooth functions in the Dirichlet norm. However, in the low dimensional case $ n\leq2 $, the space $ D^{-1} $ does not contain characteristic functions of sets of positive measure, so we extend the notion of solution to a larger space. We characterize the solution in terms of what is called the Cahn-Hoffman vector field, based on a duality argument. This argument relies on an approximation lemma which itself is interesting. We introduce a notion of calibrability of a set in our fourth-order setting. This notion is related to whether a characteristic function preserves its form throughout the evolution. It turns out that all balls are calibrable. However, unlike in the second-order total variation flow, the outside of a ball is calibrable if and only if $ n\neq2 $. If $ n\neq2 $, all annuli are calibrable, while in the case $ n = 2 $, if an annulus is too thick, it is not calibrable. We compute explicitly the solution emanating from the characteristic function of a ball. We also provide a description of the solution emanating from any piecewise constant, radially symmetric datum in terms of a system of ODEs.
Stability analysis of a targeted chemotherapy-cancer model
Authors: Das Anusmita , Dehingia Kaushik , Ray Nabajit , Sarmah Hemanta Kumar
Published: June 2023

This study addresses a modified mathematical model of tumor growth with targeted chemotherapy consisting of effector cells, tumor cells, and normal cells. To investigate the dynamics of the model, local and global stability analyses have been performed at the equilibrium points of the model. It is found that the tumor-free steady state is globally asymptotically stable under certain conditions, which suggests that the prescribed treatment can eradicate tumor cells from the body for a threshold value of tumor growth rate. The main result of this study is that if the tumor growth rate is tiny, it is possible to eradicate the tumor from the body using a smaller amount of targeted chemotherapy drugs with less harm to the other healthy cells. If not, it requires a high dose of targeted chemotherapy drugs, which can increase the side effects of the drugs. Numerical simulations have been performed to verify our analytical results.
Les opérateurs extérieurs dans l’éducation à l’esprit d’entreprendre et la forme scolaire : les enseignements d’une expérimentation menée dans des collèges de quartiers défavorisés
Authors: Bonnard Claire , Duguet Amélie , Giret Jean-François
Published: June 2023

Cette recherche porte sur une expérimentation concernant l’aide à l’orientation pour des collégiens de quartiers défavorisés. Basée sur l’intervention d’opérateurs extérieurs en lien avec le monde de l’entreprise, l’expérimentation vise à soutenir les élèves dans leur orientation et à les aider à « être entreprenants ». L’enquête qualitative réalisée auprès des formateurs et des enseignants ou personnel de direction de ces collèges souligne les enjeux mais également les difficultés de ce projet, du fait notamment de la diversité des attentes entre les acteurs impliqués.
Entrepreneuriat et esprit d’entreprendre
Authors: Champy-Remoussenard Patricia , Miribel Julien de
Published: June 2023

Si les usages du registre entrepreneurial sont très présents dans la société, ils reposent sur nombre d’ambiguïtés et d’ambivalences qui en caractérisent le lexique. Cet article revient sur les termes entreprendre, entrepreneuriat et entrepreneur, certains aspects de leur construction et de leurs usages, pour proposer un développement plus centré sur les possibilités analytiques qu’offre une entrée par les mots. Analysant la portée des ambiguïtés, des ambivalences et controverses dans ce champ lexical, l’article ouvre des perspectives d’analyse plurielles de l’éducation à l’esprit d’entreprendre.