Capturing pattern bi-stability dynamics in delay-coupled swarms

Swarms of large numbers of agents appear in many biological and engineering fields. Dynamic bi-stability of co-existing spatio-temporal patterns has been observed in many models of large population swarms. However, many reduced models for analysis, such as mean-field (MF), do not capture the bifurcation structure of bi-stable behavior. Here, we develop a new model for the dynamics of a large population swarm with delayed coupling. The additional physics predicts how individual particle dynamics affects the motion of the entire swarm. Specifically, (1) we correct the center of mass propulsion physics accounting for the particles velocity distribution; (2) we show that the model we develop is able to capture the pattern bi-stability displayed by the full swarm model.Comment: 6 pages 4 figure

Noise, Bifurcations, and Modeling of Interacting Particle Systems

We consider the stochastic patterns of a system of communicating, or coupled, self-propelled particles in the presence of noise and communication time delay. For sufficiently large environmental noise, there exists a transition between a translating state and a rotating state with stationary center of mass. Time delayed communication creates a bifurcation pattern dependent on the coupling amplitude between particles. Using a mean field model in the large number limit, we show how the complete bifurcation unfolds in the presence of communication delay and coupling amplitude. Relative to the center of mass, the patterns can then be described as transitions between translation, rotation about a stationary point, or a rotating swarm, where the center of mass undergoes a Hopf bifurcation from steady state to a limit cycle. Examples of some of the stochastic patterns will be given for large numbers of particles

Statistical multi-moment bifurcations in random delay coupled swarms

We study the effects of discrete, randomly distributed time delays on the dynamics of a coupled system of self-propelling particles. Bifurcation analysis on a mean field approximation of the system reveals that the system possesses patterns with certain universal characteristics that depend on distinguished moments of the time delay distribution. Specifically, we show both theoretically and numerically that although bifurcations of simple patterns, such as translations, change stability only as a function of the first moment of the time delay distribution, more complex patterns arising from Hopf bifurcations depend on all of the moments

Gestión de la comunicación gubernamental intercultural dirigida a pueblos indígenas en el marco de la COVID-19

La presente investigación explora las particularidades de la comunicación gubernamental con enfoque intercultural dirigida a los pueblos indígenas en el Perú, en el contexto de la emergencia sanitaria por la COVID-19. Para esto, desarrolla el marco teórico referido a los conceptos de interculturalidad y comunicación gubernamental, identificando criterios para su aplicación práctica. Luego, analiza un caso de estudio sobre gestión de la comunicación gubernamental y la aplicación del enfoque intercultural en una intervención del Ministerio de Cultura dirigida a pueblos indígenas. Como resultado de esta investigación se identifican estrategias innovadoras, como el trabajo de los gestores interculturales indígenas que permiten establecer un diálogo horizontal entre los pueblos indígenas y las entidades del Estado.This thesis explores the particular characteristics of intercultural government communication directed to indigenous peoples in the context of COVID-19. For this, it develops the theoretical framework of the concepts of interculturality and government communication, identifying criteria for its practical application. Then, presents a case study in an intervention on gubernamental and intercultural communication by the Ministry of Culture of Peru, addressed to indigenous population. As a result of the research, innovative strategies are identified, such as the work of intercultural indigenous promoters that allow the State to establish a horizontal dialogue with indigenous peoples

Pulpectomia con pasta de Hoshino modificado reporte de un caso

El objetivo de este trabajo es evaluar la efectividad de la pasta de Hoshino como tratamiento a una pulpectomía en pacientes de odontopediatria, con el fin de inhibir los microrganismos que están presentes en la pieza gracias a la extensa lesión cariosa que presenta y poder preservar la pieza hasta su exfoliación. El tratamiento que se realizo es la pulpectomía y se obturó definitivamente con la pasta de Hoshino, para la colocación del material de obturación se removió el tejido careado, se irrigó los conductos, con sustancias bacteriostáticas y bactericidas, el resultado de esta pasta fue muy efectiva mostrando mejorías tanto clínicas como radiográficas. De esta manera las pulpectomías no instrumentadas y la pasta de Hoshino utilizada mostró gran efectividad en dientes temporales con diagnósticos de necrosis pulpar. Se pudo observar eficacia tanto clínica como radiográficamente en el tratamiento, dada las grandes circunstancias para tratar piezas deciduas, tanto por la complejidad de los conductos radiculares y su anatomía accidentada, la pasta de Hoshino que utiliza una mezcla de antibióticos esteriliza con gran eficacia el conducto radicular