Parallelization using a BDD-C of a multiscale strategy with non lineal localization based on a NKS

En trabajos previos la localización no lineal fue presentada y estudiada para casos de grandes desplazamientos pero solo para problemas de estructuras con respuestas globales estables y resueltos de manera secuencial. En este trabajo se presenta la paralelización de esta estrategia de cálculo mediante el método Balancing Domain Decomposition by Constrains (BDD-C). Finalmente, se realiza una validación de la implementación en elasticidad lineal, mediante la comprobación del speed-up y la extensibilidad numérica.In previous works, the nonlinear localization was first presented and studied in the case of large displacements but only for globally stable structural responses. In this paper, the parallelization of this computational strategy using a Balancing Domain Decomposition by Constrains (BDD-C) is presented. Finally, a validation of this implementation is carried out in lineal elasticity, verifying the speed-up and the numerical extensibility.Peer Reviewe

Petascale computations for Large-scale Atomic and Molecular collisions

Petaflop architectures are currently being utilized efficiently to perform large scale computations in Atomic, Molecular and Optical Collisions. We solve the Schroedinger or Dirac equation for the appropriate collision problem using the R-matrix or R-matrix with pseudo-states approach. We briefly outline the parallel methodology used and implemented for the current suite of Breit-Pauli and DARC codes. Various examples are shown of our theoretical results compared with those obtained from Synchrotron Radiation facilities and from Satellite observations. We also indicate future directions and implementation of the R-matrix codes on emerging GPU architectures.Comment: 14 pages, 5 figures, 3 tables, Chapter in: Workshop on Sustained Simulated Performance 2013, Published by Springer, 2014, edited by Michael Resch, Yevgeniya Kovalenko, Eric Focht, Wolfgang Bez and Hiroaki Kobaysah

Linking nitrogen cycling transformations to microbial diversity in freshwater ecosystems

This is an editorial for a special issu

Investigating the behavioral effects of microinjecting hormones into the brain of the Syrian hamster (Mesocricetus auratus)

Background: Hormones are important modulators of physiological functions, behaviors, emotions, and cognition; however, most neuroscientists focus on neurotransmitters and how these chemicals affect the brain and behavioral outcomes. Studies have shown that arginine-vasopressin (AVP), a hormone that is typically known for its regulation of kidney function, microinjected in the anterior hypothalamus (AHA) induces flank marking and aggressive behaviors in Syrian hamsters (Mesocricetus auratus). In the present study, we investigated the behavioral effects of two hormones, AVP and angiotensin, microinjected into the interfascicular nucleus (IF) and the bed nucleus stria terminalis (BNST), respectively, in the Syrian hamster. Methods: Eleven hamsters (8 males, 3 females) were cannulated using stereotaxic surgeries. Seven days post-surgery, 10 hamsters (8 males, 2 females) were microinjected with 200nL of AVP, and 1 female was injected with 200nL of Angiotensin. Hamsters were also microinjected with 200nL of normal saline, which served as the control condition. Following microinjections, hamsters were placed in an apparatus and recorded using ANY-maze software for behavior observation. After finishing behavior observation, animals were anesthetized, and brains extracted. Brains were placed in 10% Formalin and later moved into 30% sucrose solution. Brains were then sliced using a cryostat and mounted onto microscope slides. Tissues were stained with toluidine blue to facilitate identification of cannula placement. Results: Six out of the 11 hamsters (1 Female, 5 Males) were placed in an apparatus one minute after the microinjections. Hamsters were tested to quantify flank marking, which is a type of social communication behavior; 3 out of 6 hamsters microinjected with AVP showed expressions of flank marking and flank grooming. While the other 3 hamsters did not express any flank marking or flank grooming. When microinjected with normal saline, all 6 animals showed zero expression of flank marking. Social interaction tests with cannulated and non-cannulated hamsters was also conducted but video scoring is pending. Conclusions: This study has shed light on the important impact hormones play in behavioral outcomes. By targeting brain regions and neural circuits we can come closer to finding interventions for neurological and psychiatric disorders using hormones. In addition to behavioral tests, immunohistochemistry will also be conducted in future dates as well as increasing our sample size for the behavioral studies

Bees visiting squash (Cucurbita moschata Duchesne ex Poiret) in southwestern Colombia (Hymenoptera: Apoidea)

This is the publisher's version, also available electronically from https://journals.ku.edu/index.php/melittology/article/view/4582.This note records for the first time 12 bee species belonging to eight genera of Apidae and Halictidae as visitors of cultivated squash (Cucurbita moschata Duchesne ex Poiret: Cucurbitaceae) in the municipality of El Patía, Department of Cauca, southwestern Colombia. Two further bee species are also recorded from a crop visited in the Department of Huil