The rich-club phenomenon across complex network hierarchies

The so-called rich-club phenomenon in a complex network is characterized when nodes of higher degree (hubs) are better connected among themselves than are nodes with smaller degree. The presence of the rich-club phenomenon may be an indicator of several interesting high-level network properties, such as tolerance to hub failures. Here we investigate the existence of the rich-club phenomenon across the hierarchical degrees of a number of real-world networks. Our simulations reveal that the phenomenon may appear in some hierarchies but not in others and, moreover, that it may appear and disappear as we move across hierarchies. This reveals the interesting possibility of non-monotonic behavior of the phenomenon; the possible implications of our findings are discussed.Comment: 4 page

Controle de podridões-radiculares na cultura do feijoeiro: eficácia da aplicação de fungicidas no sulco de plantio.

O controle de podridões-radiculares via tratamento de sementes tem sido errático, com históricos de sucesso e insucesso em diversas regiões produtoras de feijão. A pulverização de fungicidas no sulco de plantio, já utilizada em outras culturas, como o algodão e a batata, surge como alternativa a este tratamento padrão. Por este motivo, diversos fungicidas foram testados quanto a sua eficiência no controle de podridões radiculares via pulverização no sulco de plantio do feijoeiro.bitstream/CNPAF/19135/1/doc_118.pdfConvênio: Embrapa Arroz e Feijão e Hokko do Brasil

Compatibilidade de fungicidas e inseticidas no tratamento de sementes do feijoeiro (Phaseolus vulgaris L.) associadas ou não a polímeros: relatório técnico.

Tratamento de sementes do feijoeiro com inseticida; Revestimento de sementes do feijoeiro tratadas com inseticidas e fungicidas; Experimento I - Qualidade fisiológica e sanitária; Experimento II - Teste de campo; Experimento III - Avaliação da eficiência de controle de adultos da mosca branca, Bemisia argentifolii; Conclusão; Referências bibliográficas; Anexos..bitstream/CNPAF/19141/1/doc_125.pdfCooperação técnica: Embrapa Arroz e Feijão & Bayer S/A

Efeito da mistura de fungicidas aplicados via fungigação no controle do mofo-branco do feijoeiro comum.

Procurando otimizar a eficácia de controle, este trabalho objetivou determinar o efeito preventivo e residual de fungicidas utilizados em mistura e aplicados via fungigação para o controle do mofo-branco do feijoeiro.bitstream/CNPAF/19129/1/pqfoco62.pd

Efficiency of low versus high airline pressure in stunning cattle with a pneumatically powered penetrating captive bolt gun

The efficiency of stunning cattle was assessed in 443 animals (304 pure Zebu and 139 crossbred cattle), being mainly mature bulls and cows. Cattle were stunned using a Jarvis pneumatically powered penetrating captive bolt gun operating with low (160–175 psi, N = 82) and high (190 psi, N = 363) airline pressure, which was within the manufactures specifications. Signs of brain function and the position of the shots on the heads were recorded after stunning. Velocity of the captive bolt and its physical parameters were calculated. Cattle shot with low pressures showed more rhythmic respiration (27 vs. 8%, P < 0.001), less tongue protrusion (4 vs. 12%, P = 0.03) and less masseter relaxation (22 vs. 48%, P < 0.001). There was an increased frequency of shots in the ideal position when cattle were shot with the low compared to high airline pressures (15.3 vs. 3.1%). Bolt velocity and its physical parameters were significantly (P < 0.01) higher when using high pressure. Airline pressures below 190 psi are inappropriate when shooting adult Zebu beef cattle with pneumatically powered penetrating captive bolt guns

The Power Spectrum of Galaxies in the Nearby Universe

We compute the power spectrum of galaxy density fluctuations in a recently completed redshift survey of optically-selected galaxies in the southern hemisphere (SSRS2). The amplitude and shape of the SSRS2 power spectrum are consistent with results of the Center for Astrophysics redshift survey of the northern hemisphere (CfA2), including the abrupt change of slope on a scale of 30-50Mpc/h; these results are reproducible for independent volumes of space and variations are consistent with the errors estimated from mock surveys. Taken together, the SSRS2 and CfA2 form a complete sample of 14,383 galaxies which covers one-third of the sky. The power spectrum of this larger sample continues to rise on scales up to ~ 200Mpc/h, with weak evidence for flattening on the largest scales. The SSRS2+CfA2 power spectrum and the power spectrum constraints implied by COBE are well-matched by an Omega*h ~ 0.2, Omega+lambda_0=1 CDM model with minimal biasing of optically-selected galaxies.Comment: Accepted for publication in The Astrophysical Journal Letters, Sept. 23, 1994. 10 pages uuencoded compressed postscript, including two figures. JHU-9410200