Efficient discontinuous finite difference meshes for 3-D Laplace-Fourier domain seismic wavefield modelling in acoustic media with embedded boundaries

Simulation of acoustic wave propagation in the Laplace?Fourier (LF) domain, with a spatially uniform mesh, can be computationally demanding especially in areas with large velocity contrasts. To improve efficiency and convergence, we use 3-D second- and fourth-order velocitypressure finite difference (FD) discontinuous meshes (DM). Our DM algorithm can use any spatial discretization ratio between meshes. We evaluate direct and iterative parallel solvers for computational speed, memory requirements and convergence. Benchmarks in realistic 3-D models and topographies show more efficient and stable results for DM with direct solvers than uniform mesh results with iterative solvers

Using YouTube to Learn Anatomy: Perspectives of Jordanian Medical Students

Purpose. The study is aimed at exploring the popularity, impact, and usefulness of using YouTube in learning anatomy as perceived by Jordanian medical students studying at Jordan University of Science and Technology. Methods. The present work is a cross-sectional questionnaire-based study. First-, second-, and third-year medical students were invited to complete an anonymous questionnaire. Students’ responses were numerically coded, and the results were analyzed to reveal any statistically significant differences related to gender or level of study. Results. The results showed that 96.4% of the students used YouTube in general, 91.2% used it as a source of information, and 83.9% used YouTube as a learning tool in medical school. Further, YouTube was used by 79.1% of the students as an anatomy-learning tool. Most of these students used this platform in learning gross anatomy. The study also revealed that dissection videos were the most viewed anatomy-related content. Regarding the perceived value of YouTube as an anatomy-learning tool, the majority of the students reported that YouTube offered them useful anatomical information and enhanced their understanding, memorization, and recall of anatomical information. In addition, most of them recommended using YouTube as an anatomy-learning tool. Statistical analysis of the results revealed the presence of gender-related significant differences in students’ perspectives. Such differences were also found among students of different levels of study. Conclusion. Medical students have positive attitudes toward using YouTube in augmenting their anatomy learning. For this, educators are encouraged to adopt YouTube as an educational tool in their anatomy instruction and to create new anatomy-related YouTube videos to enhance their students’ learning.</jats:p

Efficient discontinuous finite difference meshes for 3-D Laplace-Fourier domain seismic wavefield modelling in acoustic media with embedded boundaries

Simulation of acoustic wave propagation in the Laplace?Fourier (LF) domain, with a spatially uniform mesh, can be computationally demanding especially in areas with large velocity contrasts. To improve efficiency and convergence, we use 3-D second- and fourth-order velocitypressure finite difference (FD) discontinuous meshes (DM). Our DM algorithm can use any spatial discretization ratio between meshes. We evaluate direct and iterative parallel solvers for computational speed, memory requirements and convergence. Benchmarks in realistic 3-D models and topographies show more efficient and stable results for DM with direct solvers than uniform mesh results with iterative solvers

Neurologic Complications of Cancer Immunotherapy

Immunotherapy has revolutionized cancer treatment over the past decade. As it is increasingly introduced into routine clinical practice, immune-related complications have become more frequent. Accurate diagnosis and treatment are essential, with the goal of reduced patient morbidity. This review aims to discuss the various clinical manifestations, diagnosis, treatments, and prognosis of neurologic complications associated with the use of immune checkpoint inhibitors, adoptive T-cell therapies, and T-cell redirecting therapies. We also outline a suggested clinical approach related to the clinical use of these agents.Medicine, Faculty ofNon UBCMedicine, Department ofReviewedFacultyResearche

Primeros levantamientos cartográficos generales de Chile con base científica: los mapas de Claudio Gay y Amado Pissis

The government authorities, from the beginning of the republican life of the Chilean nation, tried to resolve the lack of general cartography of the country with a certain level of accuracy. This would allow them to get to know its form, extension, location of the population; as well as the location of its natural resources. This context also explains the hiring in 1830 of the French naturalist Claudio Gay and later, in 1 848, of the French geologist and geographer Amado Pissis, in order to substitute such problems so for both to make a cartographic survey of the national territory. The work done by Gay and Pissis, are here analyzed from the cartographic point of view; first of all to know the procedures followed by the elaborations as well as the results obtained, and secondly to comply with the requirements asked by the government authorities, based on the contracts signed by both of them.Las autoridades de gobierno, desde principios de la vida republicana de la nación chilena, trataron de resolver la carencia de una cartografía general del país con un cierto nivel de exactitud. Esto les permitiría conocer su forma, extensión, localización de la población, así como también la ubicación de los recursos naturales. En este contexto, se explica la contratación en 1830 del naturalista francés Claudio Gay y posteriormente, en 1848, del geólogo y geógrafo francés Amado Pissis, con el fin de suplir dicha falta mediante levantamientos cartográficos, que se encomendaron a ambos del territorio nacional. Los trabajos realizados tanto por Gay como por Pissis, son analizados desde el punto de vista cartográfico, en primer lugar con el fin de conocer los procedimientos seguidos en su elaboración como asimismo los resultados, y en segundo lugar, con el objetivo de constatar el cumplimiento de los requerimientos solicitados por las autoridades de gobierno, a la luz de los contratos firmados por ambos