Radio-quiet and radio-loud pulsars: similar in Gamma-rays but different in X-rays

We present new Chandra and XMM-Newton observations of a sample of eight radio-quiet Gamma-ray pulsars detected by the Fermi Large Area Telescope. For all eight pulsars we identify the X-ray counterpart, based on the X-ray source localization and the best position obtained from Gamma-ray pulsar timing. For PSR J2030+4415 we found evidence for an about 10 arcsec-long pulsar wind nebula. Our new results consolidate the work from Marelli et al. 2011 and confirm that, on average, the Gamma-ray--to--X-ray flux ratios (Fgamma/Fx) of radio-quiet pulsars are higher than for the radio-loud ones. Furthermore, while the Fgamma/Fx distribution features a single peak for the radio-quiet pulsars, the distribution is more dispersed for the radio-loud ones, possibly showing two peaks. We discuss possible implications of these different distributions based on current models for pulsar X-ray emission.Comment: Accepted for publication in The Astrophysical Journal; 12 pages, 3 figures, 2 table

The Length of an SLE - Monte Carlo Studies

The scaling limits of a variety of critical two-dimensional lattice models are equal to the Schramm-Loewner evolution (SLE) for a suitable value of the parameter kappa. These lattice models have a natural parametrization of their random curves given by the length of the curve. This parametrization (with suitable scaling) should provide a natural parametrization for the curves in the scaling limit. We conjecture that this parametrization is also given by a type of fractal variation along the curve, and present Monte Carlo simulations to support this conjecture. Then we show by simulations that if this fractal variation is used to parametrize the SLE, then the parametrized curves have the same distribution as the curves in the scaling limit of the lattice models with their natural parametrization.Comment: 18 pages, 10 figures. Version 2 replaced the use of "nu" for the "growth exponent" by 1/d_H, where d_H is the Hausdorff dimension. Various minor errors were also correcte

New Dependencies of Hierarchies in Polynomial Optimization

We compare four key hierarchies for solving Constrained Polynomial Optimization Problems (CPOP): Sum of Squares (SOS), Sum of Diagonally Dominant Polynomials (SDSOS), Sum of Nonnegative Circuits (SONC), and the Sherali Adams (SA) hierarchies. We prove a collection of dependencies among these hierarchies both for general CPOPs and for optimization problems on the Boolean hypercube. Key results include for the general case that the SONC and SOS hierarchy are polynomially incomparable, while SDSOS is contained in SONC. A direct consequence is the non-existence of a Putinar-like Positivstellensatz for SDSOS. On the Boolean hypercube, we show as a main result that Schm\"udgen-like versions of the hierarchies SDSOS*, SONC*, and SA* are polynomially equivalent. Moreover, we show that SA* is contained in any Schm\"udgen-like hierarchy that provides a O(n) degree bound.Comment: 26 pages, 4 figure

Mel: características e propriedades.

Definicão e importância; Composição; Acúcares; Água; Enzimas; Proteínas; Ácidos orgânicos; Minerais; Vitaminas; Outros componentes; Propriedades; Aroma e sabor.bitstream/item/35907/1/Doc150.pd

Occurrence of greedy scale, Hemiberlesia rapax (Comstock) (Hemiptera: Diaspididae), on mahogany in Brazil.

Made available in DSpace on 2020-06-10T04:06:44Z (GMT). No. of bitstreams: 1 Hemiberlesiarapaxemmogno-2-7.pdf: 255888 bytes, checksum: 97b1735562bbe56f07d04315aed73791 (MD5) Previous issue date: 2020bitstream/item/213854/1/Hemiberlesiarapaxemmogno-2-7.pd

Manejo produtivo das colméias.

Introdução; Revisão das colméias; Fortalecimento das colônias; Controle da enxameação; Divisão de colônias; Recuperação de colônias poedeiras ou zanganeiras; Controle da pilhagem; Substituição de rainhas; Substituição de quadros; Transporte de colméias.bitstream/item/37222/1/Doc140.pd

Povoamento das colméias.

Introdução; Enxameação e abandono; Captura de enxames em vôo de deslocamento; Captura de enxames através de caixas-iscas; Remoção de colônias alojadas na natureza; Divisão de colônias fortes; Aquisição de colméias povoadas.bitstream/item/37220/1/Doc146.pd