Mesofauna do solo em áreas de floresta e pastagem da Amazônia Central.

bitstream/item/31980/1/CPATU-BP95.pd

Derivation of an Abelian effective model for instanton chains in 3D Yang-Mills theory

In this work, we derive a recently proposed Abelian model to describe the interaction of correlated monopoles, center vortices, and dual fields in three dimensional SU(2) Yang-Mills theory. Following recent polymer techniques, special care is taken to obtain the end-to-end probability for a single interacting center vortex, which constitutes a key ingredient to represent the ensemble integration.Comment: 18 pages, LaTe

Diagnosing numerical Cherenkov instabilities in relativistic plasma simulations based on general meshes

Numerical Cherenkov radiation (NCR) or instability is a detrimental effect frequently found in electromagnetic particle-in-cell (EM-PIC) simulations involving relativistic plasma beams. NCR is caused by spurious coupling between electromagnetic-field modes and multiple beam resonances. This coupling may result from the slow down of poorly-resolved waves due to numerical (grid) dispersion and from aliasing mechanisms. NCR has been studied in the past for finite-difference-based EM-PIC algorithms on regular (structured) meshes with rectangular elements. In this work, we extend the analysis of NCR to finite-element-based EM-PIC algorithms implemented on unstructured meshes. The influence of different mesh element shapes and mesh layouts on NCR is studied. Analytic predictions are compared against results from finite-element-based EM-PIC simulations of relativistic plasma beams on various mesh types.Comment: 31 pages, 20 figure

Up scaling guava water balance in the Petrolina-Juazeiro growing area, Northeast Brazil.

Made available in DSpace on 2017-06-17T00:36:21Z (GMT). No. of bitstreams: 1 Heriberto12012.pdf: 894482 bytes, checksum: 08c140b450852815e3c3183f5056e2af (MD5) Previous issue date: 2012-10-222012Edição do Proceedings of the III International Symposium on Guava and other Myrtaceae, Petrolina, sept. 2012