bluuebunny/crossref_metadata_2025 huggingface dataset:
Simultaneous X-Ray and Optical Polarization Observations of the Blazar Mrk 421
Authors: Bharathan Athira M. , Stalin C. S. , Sahayanathan S. , Wani Kiran , Mandal Amit Kumar , Chatterjee Rwitika , Joshi Santosh , Pandey Jeewan C. , Mathew Blesson , Agrawal Vivek K.
Published: November 2024

We present near-simultaneous X-ray and optical polarization measurements in the high synchrotron peaked (HSP) blazar Mrk 421. The X-ray polarimetric observations were carried out using Imaging X-ray Polarimetry Explorer (IXPE) on 2023 December 6. During IXPE observations, we also carried out optical polarimetric observations using 104 cm Sampurnanand telescope at Nainital and multiband optical imaging observations using 2 m Himalayan Chandra Telescope at Hanle. From model-independent analysis of IXPE data, we detected X-ray polarization with degree of polarization (ΠX) of 8.5% ± 0.5% and an electric vector position angle (ΨX) of 10.°6 ± 1.°7 in the 2−8 keV band. From optical polarimetry on 2023 December 6, in B, V, and R bands, we found values of Π
B
= 4.27% ± 0.32%, Π
V
= 3.57% ± 0.31%, and Π
R
= 3.13% ± 0.25%. The value of Π
B
is greater than that observed at longer optical wavelengths, with the degree of polarization suggesting an energy-dependent trend, gradually decreasing from higher to lower energies. This is consistent with that seen in other HSP blazars and favors a stratified emission region encompassing a shock front. The emission happening in the vicinity of the shock front will be more polarized due to the ordered magnetic field resulting from shock compression. The X-ray emission, involving high-energy electrons, originates closer to the shock front than the optical emission. The difference in the spatial extension could plausibly account for the observed variation in polarization between X-ray and optical wavelengths. This hypothesis is further supported by the broadband spectral energy distribution modeling of the X-ray and optical data.
The Challenge of Predicting the Solar Wind Speed near Sunspot Minimum
Authors: Wang Y.-M. , Samara E.
Published: November 2024

By applying potential-field source-surface and potential-field current-sheet extrapolations to photospheric field maps from three different observatories, we predict the solar wind speed at Earth for several Carrington rotations during 2018–2021 and compare the results with in situ observations. The predicted speeds are taken to be inversely correlated with the rate of flux-tube expansion inside the source surface, located at a heliocentric distance of 2.5 R
⊙. The results often differ markedly from one observatory to another and are very sensitive to the latitudinal position of the ecliptic relative to the narrow belt of slow wind that surrounds the source-surface neutral line. Our main conclusions are that (1) the magnetograph measurements themselves are a major source of uncertainty in solar wind predictions; (2) these uncertainties are especially large near solar minimum, when Earth is located near the rapid transition between slow and fast wind that occurs on either side of the heliospheric current sheet; (3) comparison of the derived open field regions with observed coronal holes provides a strong, underutilized constraint on wind speed predictions; and (4) the observed polarity of the interplanetary magnetic field provides another important constraint on the location of the source region.
Two new species of Thomasomys (Cricetidae: Sigmodontinae) from the western Andes of Ecuador and an updated phylogenetic hypothesis for the genus
Authors: Brito Jorge , García Rubí , Castellanos Francisco X. , Gavilanes Gabriela , Curay Jenny , Carrión-Olmedo Julio C. , Reyes-Barriga Daniela , Guayasamin Juan M. , Salazar-Bravo Jorge , Pinto C. Miguel
Published: November 2024

Abstract

The Andean cloud forests of Ecuador are home to numerous unique mammals. Rodents of the tribe Thomasomyini are particularly abundant in many Andean localities, with Thomasomys – the largest genus in the subfamily Sigmodontinae (51 species) – especially species-rich and diverse. Despite recent advances on the systematics of the genus, where seven species have been described in the last five years, there is tantalizing evidence that its true diversity remains completely understood. Over the course of approximately ten years of fieldwork in Ecuador, a significant number of Thomasomys specimens were collected from various localities in both, the eastern and western Andean ranges. Through an extensive genetic study of these specimens, augmented with what is available in public databases, we argue that there exist at least 20 undescribed species in the genus, with no less that twelve potential new species in Ecuador alone. In this paper, we describe two of these species belonging to the group cinereus, one recently collected and the other previously referred to as Thomasomys sp. 1; further, we present an updated cyt b gene tree of the genus. The gene tree includes at least 56 valid and putative species and supports the monophyly of the genus, while at the same time suggest a paraphyletic “aureus” group. Our findings suggest that the genus likely exhibits additional hidden diversity in significant portions of Colombia, Peru, and Bolivia which calls for the need for a comprehensive reassessment of the entire genus. The recognition of these two new species brings the total number of known Thomasomys to 53 species, 19 of which occur in Ecuador, including 17 that are endemic to this country.
Cardinality rough neighborhoods with applications
Authors: Al-shami Tareq M. , Hosny Rodyna A. , Mhemdi Abdelwaheb , Hosny M.
Published: November 2024

Rough set theory serves as an effective method for managing complicated real-world data. Through rough approximation operators, it discerns both confirmed and possible data attainable through subsets. Earlier studies have presented several rough approximation models, drawing inspiration from neighborhood systems aimed at enhancing accuracy degree and satisfying the axioms of traditional approximation spaces (TAS) that were initiated by Pawlak. This article proposes an easy method to deal with information systems in most cases, wherein it introduces a new forming of generalized approximation spaces, namely, cardinality rough neighborhoods. It is defined depending on the cardinal number of the $ \mathcal{N}_\sigma $-neighborhoods of elements that are established under an arbitrary relation. Their main features are investigated and the connections between them, as well as their relationships with the preceding kinds of neighborhood systems, are uncovered with the aid of some examples. Then, novel rough set paradigms induced by cardinality rough neighborhoods are displayed that satisfy most properties of Pawlak's paradigm. Next, a topological method to study these paradigms is provided, wherein this method produces approximation operators similar to the given paradigms in six cases that are proved. Additionally, both paradigms in a practical example concerning books and the authors who authored them or participated in their authorship are applied. To illuminate the need for the current concepts, we elaborate on their advantages from different views. Finally, a summary of the obtained results and relationships and suggestions for some forthcoming work are offered.
Studies on the Presence of Different Mating Types of Phytophthora infestans in Nuwara Eliya Sri Lanka
Authors: Salgadoe A. S. A. , Ranasinghe C. , Ranasinghe W. M. A. M.
Published: November 2024

Late blight, caused by Phytophthora infestans is one of the most devastating diseases in potato cultivation. It results in direct crop losses but also causes a considerable amount of cost for disease management. The primary objective of this study was to investigate P. infestans mating types in selected areas in Sri Lanka and evaluate the risks associated with mating types. In this experiment potato leaves from a range of late blight severity levels were sampled from infected farmer fields. The pathogen was isolated by leaf culture method and confirmed by microscopic observations. The mating types of each isolate were studied by a Metalaxyl sensitivity test. Mating type A1 has been previously reported in Sri Lanka, but mating type A2 was not reported since 2013. Results of this study reveal that mating type A1 was more prominent than A2 (75% and 50% respectively). A2 was reported only from two fields. These observations prove the presence and emergence of mating type A2 in Sri Lankan potato fields. Gradual increase of detectable A2 mating types suggests a high possibility of pathogen inoculum movement between the locations over time. The presence of both mating types raises the possibility of sexual reproduction and generation of oospores. The ratio of A1: A2: (A1+A2) in the current study was 2:1:1. This could permit genetic recombination with the biological evolution of fungicideresistant types of P. infestans species. This study emphasizes the importance of investigations on the mating types to manage late blight disease in Sri Lankan potato fields.
Depression, health-related quality of life and life satisfaction in patients with heart failure
Authors: Sedlar Kobe Natasa , Omersa Daniel , Lainscak Mitja , Farkas Jerneja
Published: November 2024

Background: The Patient Health Questionnaire 9 (PHQ9) has been recognized as an effective tool for identification of patients with heart failure (HF) at risk for lower health-related quality of life (HRQoL). We aimed to compare HRQoL levels, overall satisfaction with health and life, disease severity variables, sociodemographic variables and behavioural risk factors between patients with HF with different levels of depressive symptomatology. Methods: In a >55 years-old general population cross-sectional HF prevalence study, 1851 subjects were screened and those with NTproBNP ≥125 pg/mL (n=930) underwent detailed diagnostic visit to confirm or rule out HF as per 2016 European Society of Cardiology guidelines. HRQoL (the ShortForm 12 Health Survey, SF12; EQ5D3L), depressive symptoms (Patient Health Questionnaire, PHQ9) and satisfaction with life (Satisfaction With Life Scale, SWLS) were also assessed. Patient with HF (75±8 years, 54 % male, New York Heart Association (NYHA) functional class IIII, with mean left ventricular ejection fraction (LVEF) 56±13) were divided into three groups based on the severity of depressive symptomatology as per PHQ9 score (none: score 04, mild: score 59, and moderate-to-severe: score 1027). Multiple group comparisons and pairwise post hoc analyses were performed. Results: Results indicated significant between group differences in NYHA status (p<0.001), number of comorbidities (p=0.006), functional capacity (p=0.01), as well as HRQoL variables (p=0.05 to 0.001) and SWLS score (p<0.05), with nondepressed group generally showing better physical and subjective indicators of health and wellbeing compared with the mild and moderate-to-severe group. Conclusions: Results indicate that even patients with HF with clinically non-significant levels of depressive symptomatology show significantly impaired psychosocial status (diminished HRQoL, lower life satisfaction).
Bilateral First Rib Fractures in Blunt Trauma Patients: A Retrospective Study
Authors: Hefny Ashraf Fathi , Mansour Nirmin A , Fathi Mai A.
Published: November 2024

Introduction:

Unilateral fracture of the first rib frequently led to severe complications such as brachial plexus or major vascular injury. Bilateral first rib fracture (BFRF) is very rare. We aimed to study the incidence, mechanism of injury, management, and outcome of BFRF in blunt trauma patients in a community-based hospital.

Methods:

Data of all blunt trauma patients who were admitted to our institution with (BFRF from December 2014 through January 2017) were retrospectively collected. Data included demography, mechanism of injury, severity of the injury, associated injuries, management, and outcome.

Results:

During the study period, 4779 patients with blunt trauma were included in the trauma registry and 12 (0.25%) patients had BFRF. The mean age of standard deviation (SD) was 29 (8.3) years. Seven (58.3%) patients were involved in road traffic collisions and 5 (41.7%) patients fell from more than 3 m height. The most commonly associated thoracic injury was lung contusions in 8 (66.7%) patients. The median (range) Glasgow Coma Score on admission was 15 (14–15) and Injury Severity Score (SD) was 19 (10.5). Length of hospital stay mean (SD) was 6.8 (6.4) days. No patients died in the study.

Conclusions:

BFRF is a rare entity in blunt trauma patients caused by high-energy trauma. Major vascular or brachial plexus injuries in patients with BFRF are much less than those reported in the medical literature on unilateral first rib fractures. Associated injuries are the main cause of trauma-related morbidity rather than the direct effect of BFRF.
Vasoactive Intestinal Polypeptide Secreting MS Neuroblastoma
Authors: Thomas Josy , Peters Nitin James , Sekar Aravind , Bansal Deepak , Singh Jitender , Kanojia Ravi P. , Mahajan J. K.
Published: November 2024

ABSTRACT

We present a rare case of a 17-month-old child diagnosed with MS-stage neuroblastoma and associated chronic diarrhea due to elevated vasoactive intestinal peptide (VIP) levels. The unusual occurrence of a VIP-secreting tumor in a patient with MS neuroblastoma is a rare combination, not previously reported in the literature. The patient underwent exploratory laparotomy and excision of the tumor, leading to a significant decline in VIP levels and resolution of symptoms.
Chylous Leak after Cystic Hygroma Excision in an Infant: A Rare Postoperative Complication
Authors: Shah Amar , Momin Aryan S. , Sharma Ria , Shah Anirudh
Published: November 2024

ABSTRACT

Postoperative chylous leak is a rare but serious complication of any head-and-neck surgery. It can lead to metabolic imbalance, prolonged wound healing, wound dehiscence, and hospitalization. We present the case of a 9-month-old girl operated for a left cervical cystic hygroma who had a chylous leak requiring surgical management. This is probably one of the first reported cases of chylous leak following the excision of cystic hygroma in an infant.
Laparoscopic Management of a Rare Case of Spontaneous Biliary Perforation in an Infant
Authors: Gupta Tarun , Mandelia Ankur , Yadav Rajanikant R. , Kumar Tarun , Agarwal Nishant , Kanneganti Pujana , Verma Anju , Nair Biju , Buan Amit
Published: November 2024

ABSTRACT

Spontaneous biliary perforation is a rare condition, predominantly observed in infants, characterized by the leakage of bile into the peritoneal cavity without any apparent cause. This case report discusses a 3-month-old female infant who presented with symptoms of jaundice and abdominal distension. The successful management of this case with a combination of ultrasound-guided percutaneous drainage and laparoscopic cholecystostomy is detailed, highlighting the importance of minimally invasive techniques in treating this condition.
Type 1a Duodenojejunal Tubular Duplication Cyst with Complex Rotational Anomaly Masquerading as Chronic Anemia
Authors: Mathew Priya , Mandelia Ankur , Buan Amit , Nair Biju , Sarma Moinak Sen , Prajapati Pooja , Goel Rahul
Published: November 2024

ABSTRACT

Enteric duplication cysts and reversed intestinal rotation (RIR) are rare congenital anomalies, with their coexistence being exceptionally uncommon. We report a 4-year-old girl who presented with chronic anemia and intermittent abdominal symptoms since infancy. Detailed workup for medical causes of anemia was inconclusive. Computed tomography of the abdomen revealed intestinal malrotation with a grossly dilated small bowel loop. Intraoperative findings revealed a long duodenojejunal tubular duplication with a separate mesentery (Type 1a) and RIR. The patient underwent a Ladd’s procedure, resection of the duplication cyst, and end-to-end anastomosis. This case underscores the anatomical rarity, varied clinical presentation, and challenges in making an accurate and timely diagnosis in such a case.
Long-term clinical outcomes of remote monitoring for implantable cardioverter-defibrillators in Singapore
Authors: Tan Vern Hsen , Fong Khi Yung , Teo Lisa Jie Ting , Lo Deborah Wai Yi , Ku Fiona Wan Qi , Chan Yiong Huak , Wang Yue , Yeo Colin , Ching Chi Keong , Lim Toon Wei
Published: November 2024

Introduction:

Remote monitoring (RM) for cardiac implantable electronic devices is on the rise and has been shown to reduce the burden of in-clinic follow-up visits. We aimed to investigate the long-term clinical outcomes of RM versus no RM.

Methods:

This was a prospective, single-centre cohort study of consecutive patients with an implantable cardioverter-defibrillator (ICD) or cardiac resynchronisation therapy-defibrillator (CRT-D) followed up from 2018 to 2023. Patients who received non-ICD devices were excluded. In general, RM was offered to all patients, but uptake depended on patient preference. For data analysis, patients were stratified according to whether RM was used. The primary outcome was all-cause mortality; secondary outcomes were hospitalisation for heart failure and device therapy (shocks and electrical storm).

Results:

Of 551 patients, 284 (51.5%) received RM and 267 (49.5%) did not. Baseline demographics were similar between the two arms. All-cause mortality was significantly lower in RM versus non-RM patients (hazard ratio [HR] 0.45, 95% confidence interval [CI] 0.33–0.60, P <0.001), as was hospitalisation for heart failure (HR 0.39, 95% CI 0.25–0.59, P <0.001); these remained significant after adjustment for baseline covariates. More patients on RM received appropriate antitachycardia pacing (ATP) (17.6% vs. 10.7%, P = 0.035) and appropriate shocks (24.1% vs. 14.7%, P = 0.017). The incidences of inappropriate ATP, inappropriate shocks and electrical storm were similar. More patients on RM underwent pulse generator change (34.1% vs. 10.1%, P <0.001).

Conclusion:

Remote monitoring was associated with significantly lower mortality in both ICDs and CRT-Ds and in primary and secondary indications, as well as fewer heart failure hospitalisations. This supports current guidelines recommending the use of RM in all patients with ICD or CRT-D.
DESDE LA HISTORIA LOCAL A LA DIDÁCTICA DEL PATRIMONIO: ESTRATEGIA DIDÁCTICA PRESENTADA EN UN TALLER PARA PROFESORES DE VILLA DULCE CRAV
Authors: Ibarra Peña Carolina
Published: November 2024

Este artículo presenta una estrategia Didáctica para el desarrollo de habilidades de pensamiento superior a partir del concepto de Patrimonio Cultural Inmaterial, la cual fue presentada en un taller para profesores realizado en la Escuela John Kennedy de Villa Dulce CRAV, introduciendo el tema de la Didáctica del patrimonio a las aulas con el fin de lograr el conocimiento de la Historia y la Geografía locales permitiendo la valoración del Patrimonio de la ciudad y el establecimiento de vínculos identitarios por medio de la vivencias de la comunidad investigada, así como desde el espacio geográfico donde alumnos y profesores viven o realizan sus actividades diarias. De esta manera, lograr visualizar que la Didáctica del patrimonio posibilita, por medio del método del Historiador y de la observación de la geografía, la comprensión del desarrollo de una comunidad en un tiempo y espacio determinados y, con ello, valorar su herencia cultural inmediata.
EL ENFOQUE BASADO EN LA INVESTIGACIÓN COMO METODOLOGÍA DE ENSEÑANZA EN LAS ESCUELAS INGLESAS
Authors: Manning Russell , Soto Lillo Paula
Published: November 2024

Cómo está estructurado el sistema escolar inglés, cuáles son las políticaspúblicas que lo rigen y cómo eso se ve reflejado en las metodologíasde enseñanza dentro de la sala de clases y particularmente en la asignaturade Historia es el foco principal del presente artículo.A partir de la observación de clases y planificaciones de aula enescuelas públicas y privadas de la ciudad de Birmingham en Inglaterrajunto a la visión de un profesor y docente de formación inicial deprofesores de Historia de la Universidad de Birmingham que conoce acabalidad el sistema, fue posible identificar que el enfoque centrado enla investigación aparece como práctica predominante de la enseñanzade la Historia en las aulas inglesas. La razón es que dicha metodologíapermite desarrollar en los estudiantes una serie de habilidades queresultan fundamentales para el desempeño futuro de los estudiantes,lógica que sigue las directrices de la política pública educativa enInglaterra.
¿PREGUNTAS E HIPÓTESIS? ¿POR QUÉ? UNA PROPUESTA DIDÁCTICA DESDE LA HISTORIA
Authors: Aravena C Felipe
Published: November 2024

¿PREGUNTAS E HIPÓTESIS? ¿POR QUÉ? UNA PROPUESTA DIDÁCTICA DESDE LA HISTORIA
CONVOCATORIA
Authors: Equipo Andamio
Published: November 2024

CONVOCATORIA
LA CONSTITUCIÓN DE UNA DIDÁCTICA DE LA HISTORIA Y LA FORMACIÓN DOCENTE: POR UN CONCEPTO DEL APRENDIZAJE HISTÓRICO
Authors: FRONZA MARCELO
Published: November 2024

En este artículo se propone investigar las ideas en relación con el conocimiento que permiten dar sentido a la formación de profesores en Brasil. Esto mediante la comprensión de los problemas conectados a la formación de los profesores de historia y sus formas de producción de conocimiento histórico. Con esto, buscamos estimular el abordaje temática de los enfoques relacionados con la formación de los docentes de historia en Brasil y cómo estructurar la función didáctica del conocimiento histórico. A partir de este, puede mostrar la especificidad de la constitución del conocimiento histórico sobre la Didáctica de la Historia como función de orientación de sentido del tiempo de la formación del profesorado como elemento estructurante de la cultura histórica de Brasil. Por último, se presenta un análisis de las dificultades y posibilidades de la construcción una Didáctica de la Historia que se centró en la formación de profesores y que influyó en el desarrollo de la disciplina de la historia en Brasil durante el principios del siglo XXI.
EL ENFOQUE FORMATIVO DE LA HISTORIA, DESDE LA EPISTEMOLOGÍA REFLEXIVA DE LA PRÁCTICA EN LA NORMAL SUPERIOR
Authors: SANTANA ANCHONDO ISKRA NEYVA
Published: November 2024

El plan de estudios 1999 para la licenciatura en secundaria, representó un cambio fundamental en el paradigma formativo de las escuelas Normales Superiores de México, la enseñanza basada en los contenidos disciplinares, la acumulación de información y las clases magistrales del “catedrático”, dirigida a la educación media, se transformó en un perfil de egreso basado en competencias docentes, en el que las asignaturas se caracterizan por poseer un sentido formativo, al considerar los propósitos y retos de la escuela secundaria y la contribución de las disciplinas en el logro del perfil del docente de este nivel de Educación Básica. La relación teoría/práctica constituye un eje vertebrador en la estructura curricular, que como en ningún otro momento, enfrenta a los normalistas a situaciones problemáticas que exigen una reflexión permanente y un proceso de indagación que les permita descubrir nuevas formas de acción para resolverlas y alcanzar resultados esperados. En este contexto, la enseñanza de la historia ha significado un cambio fundamental en la manera de concebir el rol del docente y el papel del alumno en el aprendizaje. Los alumnos participan activamente, avanzan en la apropiación del conocimiento histórico, comprenden su trascendencia y la relación que guardan los hechos con su contexto cercano.
El enfoque formativo de la historia, encuentra condiciones propicias en la medida en que el normalista se desarrolla como practicante reflexivo. Inicia en periodos breves de práctica escolar y culmina con la implementación de una propuesta didáctica, en la cual someten a prueba estrategias, métodos y recursos que se perfeccionan conforme se resuelven problemáticas reales a partir de la investigación en la acción.
ENTREVISTA
Authors: Andamio Equipo
Published: November 2024

En mayo de 2015 fue enviado al Parlamento un proyecto de ley que propuso que todos los establecimientos reconocidos por el Estado tendrían que elaborar un plan...
EL PROCESO EVALUATIVO EN LA ENSEÑANZA DE LA HISTORIA
Authors: Miralles Martínez Pedro , Díaz-Serrano José
Published: November 2024

La evaluación es una cuestión crucial de la educación so-bre la que queda mucho por investigar e innovar desde la didáctica de las ciencias sociales. Este trabajo trata de mostrar las dimensiones implicadas en la evaluación y los instrumentos que deben complemen-tarse en el proceso, de acuerdo con las prescripciones vigentes para la enseñanza de la historia. La revisión teórica pondrá en valor la nece-sidad de situar al alumnado como agente del proceso de evaluación y la formación del profesorado como motor de cambio hacia prácti-cas evaluativas coherentes con las competencias y las habilidades de pensamiento histórico.
RESEÑAS DE TRABAJOS DE TITULACIÓN
Authors: Oyanedel Bernal Carmen
Published: November 2024

Todo camino llega a su fin, esta situación está muy presente en los estudiantes de Pedagogía en Historia, Geografía y Ciencias Sociales, del Instituto de Historia, quienes ven en sus trabajos de titulación el fruto de este proceso de formación y el medio para expresar su interés en alguna problemática tanto histórica como didáctica, presentando una posible solución a ello.
RESEÑA BIBLIOGRÁFICA
Authors: Moro Bengoechea Jesús María
Published: November 2024

El profesor Joaquín García Andrés, doctor en Didáctica de las Ciencias Sociales por la Universidad de Valladolid y consuma-do especialista en innovación educativa y mecanismos moti-vadores en la enseñanza de la Historia, nos presenta un libro en el que se aborda la motivación escolar desde una perspec-tiva práctica. Responde así a algunas necesidades cada vez más acuciantes del sistema educativo español: fomentar el éxito educativo, mejorar la valoración por los aprendizajes y reducir el abandono escolar.El libro se publicó en castellano en 2015 por la editorial de la Universidad de Burgos y pertenece a la colección Estudios y Monografías.
HACIENDO LA HISTORIA SIGNIFICATIVA
Authors: Morton Tom
Published: November 2024

Este artículo es una version revisada de la presentación hecha en el VIII Simposio Internacional de Didáctica de las Ciencias Sociales en el ámbito Iberoamericano y XVI Seminario de Didáctica de la Historia, Geografía y Ciencias Sociales organizado por el Instituto de Historia de la Pontificia Universidad Católica de Valparaíso el año 2018. Los estudiantes no ven el valor de la Historia para sus vidas. El autor comienza con una breve descripción de las Ferias de Patrimonio en Canadá que son un ejemplo de cómo los docentes pueden hacer la historia significativa para sus estudiantes. Luego, va directamente a explicar el Historical Thinking Project, su historia, una explicación de los Seis Grandes Conceptos Históricos y cómo ellos pueden ayudar a los docentes a construir narrativas con sus estudiantes para que puedan ver la historia como una asignatura significativa.
Reseña Bibliográfica
Authors: Aravena Moraga Matías Andrés
Published: November 2024

Reseña Bibliográfica
Oscillatory integrals and weighted gradient flows
Authors: Greenblatt Michael
Published: November 2024

We investigate estimating scalar oscillatory integrals by integrating by parts in directions based on

(x_{1} \partial_{x_1}f(x) ,\dots, x_{n} \partial_{x_n}f(x))

, where

f(x)

is the phase function. We prove a theorem which provides estimates that are uniform with respect to linear perturbations of the phase and investigate some consequences. When the phase function is quasi-homogeneous the theorem gives estimates for the associated surface measure Fourier transforms that are generally not too far off from being sharp. In addition, the theorem provides a new proof, up to endpoints, that the well-known oscillatory integral estimates of Varchenko when the Newton polyhedron of the phase function is nondegenerate extend to corresponding bounds for surface measure Fourier transforms when the index is less than

1/2

. A sharp version of this was originally proven by the author [J. Funct. Anal. 262 (2012), no. 5, 2314–2348].
Алгебраические структуры, лежащие в основе процесса янг-бакстеризации
Authors: Ozdemir Cansu , Gahramanov Ilmar B
Published: November 2024

Обсуждается процесс янг-бакстеризации в представлениях группы кос, а также роль $n$-CB-алгебр в этом процессе. Представлены диаграммы, которые показывают определяющие соотношения для $4$-CB-алгебр. Эти соотношения иллюстрируются с помощью изоморфизма между общей свободной алгеброй, порожденной генераторами алгебры Бирмана-Мураками-Венцля $\{1\}$, $\{E_i\}$ и $\{G_i\}$, и тангл-алгеброй Кауфмана.
Преобразование гамильтонианов и уравнения квантовых возмущений в моделях точечной черной дыры и некоммутативной черной дыры
Authors: Yan Jun
Published: November 2024

Исследовано преобразование гамильтонианов уравнения Дирака с квантовым возмущением в двумерных моделях черных дыр. Выведены гамильтонианы модифицированной модели Раби для точечной черной дыры и некоммутативной черной дыры и найдены возмущения скорости и ускорения дираковских частиц в данной модели. На основе решений уравнения Дирака получены уравнения флуктуации плотностей заряда и тока в двух типах черных дыр. Результаты показывают, что гамильтонианы содержат поправочные члены с разными степенями операторов рождения и уничтожения, а ускорения имеют некоторые дополнительные члены, описывающие быстрые осцилляции дираковской частицы (эффект Zitterbewegung). Кроме того, в уравнения флуктуаций плотностей заряда и тока операторы координат входят с разными степенями. Эти особенности можно использовать для различения разных типов черных дыр в моделях аналоговой гравитации.
Об однозначной разрешимости задачи дивергенция-ротор в неограниченных областях и энергетических оценках решений
Authors: Gorshkov Alexey Vyacheslavovich
Published: November 2024

Исследуется задача восстановления соленоидального векторного поля по функции ротора с условием прилипания на границе внешней двумерной области. Получены критерий разрешимости как условия ортогональности функции ротора гармоническим функциям и оценки решения в пространствах $L_2$ и $H_1$.
Матрицы полной, классической и квантовой неопределенностей, полученные с использованием монотонных операторных функций
Authors: Fan Jing Ya , Li Nan , Luo Shunlong
Published: November 2024

В квантовой теории информации важно различать классическую и квантовую информацию. Представлено расширение на неэрмитовы операторы концепции метрически усовершенствованной корреляционной меры и некоторых связанных с ней мер и установлено несколько соотношений для метрически усовершенствованной косой информации с различными монотонными операторными функциями. С использованием этих функций введены три матрицы неопределенности, порождаемой каналами, а именно матрицы полной, классической и квантовой неопределенностей. Получено разложение матрицы полной неопределенности на классическую и квантовую части и исследованы основные свойства введенных матриц. В качестве приложений с помощью матриц неопределенности проведена количественная оценка декогерентности, вызванной действием квантовых каналов на квантовые состояния, и вычислены матрицы неопределенности для некоторых типичных каналов, что помогает выявить присущие им особенности. Кроме того, установлено несколько соотношений неопределенностей в терминах дисперсии, улучшающих традиционные соотношения неопределенностей Гейзенберга.
О некоммутативных модифицированных системах Кадомцева-Петвиашвили
Authors: Wang Zheng , Li Chuanzhong
Published: November 2024

Исследуются калибровочные преобразования некоммутативной иерархии модифицированного уравнения Кадомцева-Петвиашвили и некоммутативной иерархии модифицированного уравнения Кадомцева-Петвиашвили со связями в версии Купершмидта-Кисо. Введен оператор Орлова-Шульмана, который зависит от временны́х переменных и одевающих операторов, построена симметрия квантового тора для некоммутативной иерархии модифицированного уравнения Кадомцева-Петвиашвили. Предложен оператор рекурсии для некоммутативной иерархии модифицированного уравнения Кадомцева-Петвиашвили со связями. Также предложена расширенная некоммутативная иерархия модифицированного уравнения Кадомцева-Петвиашвили. Построены уравнения совместности потоков некоммутативного модифицированного уравнения Кадомцева-Петвиашвили и расширенного некоммутативного модифицированного уравнения Кадомцева-Петвиашвили.
Об уравнении Хироты с самосогласованным источником
Authors: Khasanov Aknazar Bekdurdievich , Reyimberganov Anvar Aknazarovich
Published: November 2024

Разработан формализм решения задачи Коши для дефокусирующего уравнения Хироты с самосогласованным источником методом обратной задачи рассеяния. Особенностью рассматриваемой задачи Коши является то, что предполагается стремление решения к ненулевым пределам при стремлении пространственной переменной к плюс и минус бесконечности. Описываются два основных этапа формализма: во-первых, обратной задачи рассеяния для ассоциированной линейной системы Захарова-Шабата и, во-вторых, эволюции ассоциированных данных рассеяния. Доказана теорема об эволюции данных рассеяния самосопряженной системы Захарова-Шабата, потенциал которой является решением дефокусирующего уравнения Хироты с самосогласованным источником.
Геометрия группы Ли: тензоры Римана и Риччи и нормальные формы алгебр Ли
Authors: Borovskikh Aleksey Vladislavovich
Published: November 2024

В контексте обнаруженной в предыдущей работе связи левоинвариантных объектов (как геометрических, так и динамических), заданных на группе Ли, с алгеброй правых автоморфизмов (двойственной алгеброй) рассматривается представление через эту алгебру и соответствующую метрическую форму основных геометрических характеристик. Показано, что они являются постоянными (не зависят от точки) и определяются только структурными константами двойственной алгебры и коэффициентами метрической формы.
Благодаря такой связи удается ввести понятие нормальных форм алгебры Ли. Приведение любой алгебры и любой метрики к нормальной форме состоит фактически в приведении двух квадратичных форм к каноническому виду: сначала к сумме квадратов линейных дифференциальных форм приводится метрика, а затем к диагональному виду приводится постоянная матрица, характеризующая тензор Риччи (и тогда на диагонали оказываются главные кривизны).
Оказалось, что для трехмерных алгебр Ли имеются всего две различные нормальные формы, каждая зависит от трех параметров, связанных в общем случае с тремя главными кривизнами.
3D-совместность негативных потоков
Authors: Adler Vsevolod Eduardovich
Published: November 2024

Изучено свойство 3D-совместности для негативных симметрий уравнений типа Кортевега-де Фриза, объяснена его связь с 3D-совместностью дискретных уравнений.
Overexpression of proteasome 26S subunit non-ATPase 6 protein and its clinicopathological significance in intrahepatic cholangiocarcinoma
Authors: Tang Zhong-Qing , Tang Yu-Lu , Qin Kai , Li Qi , Chen Gang , Huang Yu-Bin , Li Jian-Jun
Published: November 2024

BACKGROUND

Currently, intrahepatic cholangiocarcinoma (ICC) poses a continuing, significant health challenge, but the relationship has yet to be established between ICC and the proteasome 26S subunit non-ATPase 6 (PSMD6).

AIM

To investigate the protein expression and clinicopathological significance of PSMD6 in ICC.

METHODS

The potential impact of the PSMD6 gene on the growth of ICC cell lines was analyzed using clustered regularly interspaced short palindromic repeat knockout screening technology. Forty-two paired specimens of ICC and adjacent non-cancerous tissues were collected. PSMD6 protein expression was determined by immunohistochemistry. Receiver operating characteristic curve analysis was performed to validate PSMD6 expression level, and its association with ICC patients’ various clinicopathological characteristics was investigated.

RESULTS

The PSMD6 gene was found to be essential for the growth of ICC cell lines. PSMD6 protein was significantly overexpressed in ICC tissues (P < 0.001), but showed no significant association with patient age, gender, pathological grade, or tumor-node-metastasis stage (P > 0.05).

CONCLUSION

PSMD6 can promote the growth of ICC cells, thus playing a pro-oncogenic role.
Development and validation of biomarkers related to anoikis in liver cirrhosis based on bioinformatics analysis
Authors: Luo Jiang-Yan , Zheng Sheng , Yang Juan , Ma Chi , Ma Xiao-Ying , Wang Xing-Xing , Fu Xin-Nian , Mao Xiao-Zhou
Published: November 2024

BACKGROUND

According to study, anoikis-related genes (ARGs) have been demonstrated to play a significant impact in cirrhosis, a major disease threatening human health worldwide.

AIM

To investigate the relationship between ARGs and cirrhosis development to provide insights into the clinical treatment of cirrhosis.

METHODS

RNA-sequencing data related to cirrhosis were obtained from the Gene Expression Omnibus database. Differentially expressed genes (DEGs) between cirrhotic and normal tissues were intersected with ARGs to derive differentially expressed ARGs (DEARGs). The DEARGs were filtered using the least absolute shrinkage and selection operator, support vector machine recursive feature elimination, and random forest algorithms to identify biomarkers for cirrhosis. These biomarkers were used to create a nomogram for predicting the prognosis of cirrhosis. The proportions of diverse immune cell subsets in cirrhotic vs normal tissues were compared using the CIBERSORT computational method. In addition, the linkage between immune cells and biomarkers was assessed, and a regulatory network of mRNA, miRNA, and transcription factors was constructed relying on the biomarkers.

RESULTS

The comparison of cirrhotic and normal tissue samples led to the identification of 635 DEGs. Subsequent intersection of the DEGs with ARGs produced a set of 26 DEARGs. Subsequently, three DEARGs, namely, ACTG1 , STAT1 , and CCR7 , were identified as biomarkers using three machine-learning algorithms. The proportions of M1 and M2 macrophages, resting CD4 memory T cells, resting mast cells, and plasma cells significantly differed between cirrhotic and normal tissue samples. The proportions of M1 and M2 macrophages, resting CD4 memory T cells, and resting mast cells were significantly correlated with the expression of the three biomarkers. The mRNA–miRNA–TF network showed that ACTG1 , CCR7 , and STAT1 were regulated by 28, 42, and 35 miRNAs, respectively. Moreover, AR, MAX, EP300, and FOXA1 were found to regulate four miRNAs related to the biomarkers.

CONCLUSION

This study revealed ACTG1 , STAT1 , and CCR7 as biomarkers of cirrhosis, providing a reference for developing novel diagnostic and therapeutic strategies for cirrhosis.
Re-Creation of a Classic Novel through Transmedia Storytelling : Cross-Cultural Learning Focusing on Tess of the d'Urbervilles
Authors: Lee Kwang-Soon
Published: November 2024

This study explores the transmedia-storytelling model to induce EFL learners to participate in project-based learning while reading a classic novel, Tess of the d'Urbervilles. The objectives are to encourage their participation and to design a class representing ‘limited selection and freedom’ for the twenties. In particular, when provided with subtitles through CCD (Cross-Cultural Dialogue) based inquiry, learners can experience student-centered creation activities by adding, reforming, and storytelling the content. In this study, the more the students learn about individual freedom and the ability to adapt, the higher consideration they will have for both their own and other cultures, which can improve their emotional resilience. They will also learn that studyng with people from different cultural backgrounds can promote their learning efficacy. Hopefully, this study can contribute to building a model of Liberal Arts to encourage further readings in the Classics and to activate learners’ convergence skills in English language classes.
Development of a Balanced Liberal Arts Subject, ‘Book and Video Curation for the Growth of College Students’
Authors: Jeon Jonghee
Published: November 2024

The purpose of this study is to develop ‘Book and Video Curation for the Growth of College Students’ as a subject within the field of balanced liberal arts area. Students of today's generation live in a busy environment where it is not easy for them to find and read recognized classics or to see visual versions of these works on their own. They are aware of the need, but it is all too easy for such classics to be deprioritized, and it is also difficult for students to judge and gauge what a good book is as opposed to one that is a “must-read.” In this context, this study is related to developing a book-and video-based liberal arts curriculum that can help college students develop their thinking skills and their academic capabilities from a holistic perspective. To this end, from 2023 to 2024, screen-selling works, books in curation and liberal arts subjects, and video-related journals were surveyed online from various angles, focusing on Google and Riss. The collected data were summarized and reflected in related prior research, research methods, and research results. Through this study, we hope that college students will be able to have a meaningful time reading their chosen books, reconfirming the work’s message through video, and developing the wherewithal to reflect upon and put into practice what they have learned.
The Impact of General Education Satisfaction on Core Competencies in the Cyber University Teaching and Learning Environment
Authors: Kim Yoon Jung , Lee Ki Won
Published: November 2024

The objective of this study is to identify the characteristics of students at Cyber universities and to empirically analyze the impact of their satisfaction with general education on core competencies. A survey was conducted with 1,196 students from S Cyber University in the metropolitan area, with the objective of assessing their satisfaction level with general education and core competencies. The study employed a variety of analytical techniques, including correlation analysis, descriptive statistics, independent t-tests, simple and multiple linear regression analysis, to verify the relationships between general education satisfaction and core competencies.
The findings revealed that significant differences in some core competencies were identified based on gender, transfer status, and whether students had been enrolled for more than two semesters, underscoring the necessity for tailored educational programs that consider demographic factors and learning experiences. Secondly, the results of the simple linear regression analysis indicated that student satisfaction with general education had a significant positive impact on all core competencies, with the strongest effect observed on the communication and cooperation competency. Thirdly, the results of the multiple linear regression analysis indicated that satisfaction with general education had a significant positive impact on all core competencies. Additionally, factors such as enrollment for more than a year, gender, and age group had a significant positive effect on some core competencies.
Based on the findings, the study emphasizes the crucial role of general education in enhancing core competencies within the Cyber university learning environment. It also proposes the development of tailored educational programs aimed at improving specific competencies, such as global citizenship. Moreover, the study confirms that even in remote learning environments, general education plays a key role in promoting interaction and cooperation among students. This suggests that enhancing the quality of general education can maximize students' learning experiences and contribute to the achievement of Cyber universities' educational goals.
Professors’ Academic Advising Experience in Faculty-only Model
Authors: Park Altteuri , Lee Jung-In
Published: November 2024

The purpose of this study is to explore in depth what experiences professors have while providing academic advising at universities. For this purpose, five professors with academic advising experience at K University in Chungcheong Province were selected as research participants and interviews were conducted. The collected data were analyzed using the constant comparison method. The results are as follow. First, professors covered five areas in academic advising: adaptation to college life, academics, career path, psychology-emotion, and others. Second, the positive experiences in academic advising recognized by professors were divided into two areas: direct effects and indirect effects. Third, four areas were identified regarding the difficulties experienced by professors while carrying out academic advising: lack of administrative support, psychological burden, difficulties due to student characteristics, and limitations arising from the role of advisor (dual relationship). Fourth, the support plan for academic advising recognized by professors were organized into two areas: close support for academic advising and separation of professors academic advising, and professional counseling. Based on these results, a support plan for professors' academic advising and implications for higher education were discussed.
Trends and Prospects of Language Education Research Using Generative AI : Focusing on Topic Modeling and Keyword Analysis
Authors: Cha Jun Woo
Published: November 2024

The purpose of this study is to analyze the latest research trends in language education using artificial intelligence, focusing on the potential and prospects of generative artificial intelligence in this field. To achieve this, academic journals and dissertations published on the Korea Citation Index (KCI) and the Academic Research Information Service (RISS) were thoroughly searched to collect subjects for research, which were then analyzed using statistical methods and LDA-based topic modeling techniques. The analysis showed a significant increase in research, with 92 studies emerging after the development of ChatGPT 3.0 in 2023, predominantly focusing on the use of generative AI. The majority of these studies were focused on the Korean language, followed by English and German. Keyword analysis of the 92 academic documents using topic modeling techniques revealed that terms such as ‘education’, ‘generation’, ‘utilization’, ‘artificial intelligence’, and ‘learning’ were most frequently used. Based on these findings, the study examines practical examples of generative AI use in language education both domestically and internationally, explores its potential in the educational field, identifies challenges when utilizing generative AI in language education, and proposes solutions to address these issues.
An Analysis of the Effect of Cross-Enrollment between High School and University on the Labor Market Performances
Authors: Yee Seung-Yeol , Choi Kang Shik , Lee Bokyoung
Published: November 2024

This study analyses the effect of cross-enrollment between high school and college on the college GPA as well as labor market performances. It uses a three-year(2017-2019) survey of the Graduates Occupational Mobility Survey(GOMS) and sets up the comparison group with similar attributes of the treated group based on the propensity score matching method. The results show that liberal arts students at high school who enrolled in science majors acquired a lower GPA at college than the comparison groups, but they were advantageous in employment. Similar results were found among science students who enrolled in liberal arts majors, but the results were not statistically significant. In addition, no meaningful differences were found in the probability of getting permanent job employments nor in earning levels. The results imply that cross-enrollment decisions do not seem to be a mere strategic behavior when it comes to college entrance. Therefore, it should to be encouraged to exploit the advantages of integrated learning rather than to be discouraged.