Mapping the thematic evolution in Communication over the first two decades from the 21st century: A longitudinal approach

This study offers an overview of the thematic structure in Communication during the first two decades of the 21st century, 2001-2010 and 2011-2020. The included work mapped author keywords and keywords plus of citable articles published in the Journal Citation Reports-2019 edition. A longitudinal perspective was employed to visualize the thematic evolution. Four predominant thematic areas were evidenced in both periods: (1) Speech and Language, (2) Commercial Communication, (3) Health Communication, and (4) Organizational Communication. There were four topics reflecting the formation of substantial research areas during the second decade, such as (1) Science Communication, (2) Scholarly Publishing, (3) Mental Health and Interpersonal Relationships, and (4) Crime and Violence. In general, from the first to the second decade, the technological dimension ceased to be predominant, and instead, there was a more significant presence of themes that responded to a socio-psychological dimension

An Experience in Mentoring: Shaping Young Mathematical Minds

The Math PLUS program is a partnership between Linfield College and a local middle school which seeks to encourage more mathematics in local and regional science fairs. Linfield students are paired with middle school students to mentor science fair projects that are required to have a mathematical focus. We briefly discuss an overview of the program—its goals, structure and execution—before touching on our personal experiences as mentors for Yamhill-Carlton Intermediate School students. We also provide suggestions for improvements for those looking to implement similar programs at their own institution. The program is funded by a Dolciani Mathematics Enrichment Grant

Neotectonic deformations in the fluvial relief of the Llanura Sur of Pinar del Río, Cuba

Las investigaciones neotectónicas se enfocan a la determinación de los movimientos tectónicos más recientes de la corteza terrestre y poseen un gran significado en el análisis geomorfológico de la estructura del relieve moderno. En las regiones relativamente llanas no siempre resulta fácil el reconocimiento de evidencias de las deformaciones neotectónicas en el relieve fluvial. Desde el punto de vista metodológico, quedó demostrada la eficiencia del empleo de los métodos geológicos, geomorfológicos y edafológicos, como la evaluación morfométrica del relieve, el análisis de anomalías del drenaje, el estudio de la distribución espacial de los complejos estratigráficos y de los sedimentos aluviales, y la espectrometría del canal de potasio en los mismos. Sus resultados destacaron la existencia de bloques longitudinales de tipo horst y graben, corroborando los resultados geofísicos y de perforaciones, así como la identificación de tres bloques transversales escalonados, de oeste a este, con amplitudes diferenciadas de los desplazamientos verticales del orden de 6 y 10 m. Los bloques centro-orientales (II y III) han experimentado una basculación tectónica sostenida, forzando la migración de la red fluvial en dirección suroeste, como lo evidencia la asimetría de las cuencas hidrográficas y la migración de los ríos en esa dirección. Finalmente, se pudo establecer que los ríos, en la parte axial de la llanura, muestran un patrón regional de inflexión horaria de sus cauces, asociado probablemente a movimientos neotectónicos decizalladura que se manifiestan a lo largo de la dislocación que constituye el límite meridional de la depresión Los Palacios

Fractional Newton-Raphson Method Accelerated with Aitken's Method

The Newton-Raphson (N-R) method is characterized by the fact that generating a divergent sequence can lead to the creation of a fractal, on the other hand the order of the fractional derivatives seems to be closely related to the fractal dimension, based on the above, a method was developed that makes use of the N-R method and the fractional derivative of Riemann-Liouville (R-L) that has been named as the Fractional Newton-Raphson (F N-R) method. In the following work we present a way to obtain the convergence of the F N-R method, which seems to be at least linearly convergent for the case where the order $\alpha$ of the derivative is different from one, a simplified way to construct the fractional derivative and fractional integral operators of R-L is presented, an introduction to the Aitken's method is made and it is explained why it has the capacity to accelerate the convergence of iterative methods to finally present the results that were obtained when implementing the Aitken's method in F N-R method.Comment: Newton-Raphson Method, Fractional Calculus, Fractional Derivative of Riemann-Liouville, Method of Aitken. arXiv admin note: substantial text overlap with arXiv:1710.0763

Identidad Social y Protesta Política en la Transición Democrática Mexicana

Se realizó un estudio para analizar la influencia del componente de la identidad social en las acciones de protesta política en el marco del desafuero del alcalde de la Ciudad de México. De los elementos que componen la identidad social sólo la estructura de la situación intergrupal y la identificación grupal resultaron ser variables con capacidad predictiva, así se evidencia que la pertenencia a organizaciones, el grado de inclusión en la identificación y la valoración política no impactan en la decisión de participar en acciones de protesta