Majority-vote on undirected Barabasi-Albert networks

On Barabasi-Albert networks with z neighbours selected by each added site, the Ising model was seen to show a spontaneous magnetisation. This spontaneous magnetisation was found below a critical temperature which increases logarithmically with system size. On these networks the majority-vote model with noise is now studied through Monte Carlo simulations. However, in this model, the order-disorder phase transition of the order parameter is well defined in this system and this wasn't found to increase logarithmically with system size. We calculate the value of the critical noise parameter q_c for several values of connectivity $z$ of the undirected Barabasi-Albert network. The critical exponentes beta/nu, gamma/nu and 1/nu were calculated for several values of z.Comment: 15 pages with numerous figure

The use of natural gas as fuel for motorcycles

Utilization of motorcycle in Malaysia is really synonym especially for lower income group. Statistic for motor vehicles in Malaysia shown that nearly five million units or over the half are motorcycles. These are mostly small capacity, two or four stroke engine motorcycles. The use of low quality fuel to operate motorcycles causes a serious pollutant especially in densely populated areas. Besides, crude oil reserve in Malaysia is expected to finish within 19 years. Natural gas is now acknowledged by the world as being a mainstream alternative fuel. It has a high octane rating that is general indication of the ability of the fuel to burn more efficient and improving engine performance. Malaysia has massive, under exploited natural gas reserve. As such a study has been conducted by a group of researchers from Gas Technology Centre (GASTEG) to diversify the usage of natural gas especially as a fuel for internal combustion engine. The product of this research is a set of natural gas conversion kits and the first prototype of natural gas motorcycle. The exhaust emissions from natural gas motorcycle give complete combustion, which decrease 99.6% of carbon monoxide and 72.5% of unburned hydrocarbon at a speed of 70km/hr. However, the lower heat content of natural gas and the lower burning velocity as compared to gasoline reduces the engine maximum power for about 15% at high engine speed without any modification to the original engine. These parameters can be used as a guidance to the motorcycle industry how to utilise natural gas as a fuel, a new and a leading technology for the world that propelling Malaysia for the next millennium with clean city

Competicao entre cultivares de tomate (Lycopersicum esculentum Mill) em seis epocas de semeadura, no Piaui: II - Resultados obtidos na primeira e segunda epoca.

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Ocorrência do mal-do-panamá em bananeira do subgrupo Figo, em Piau, Minas Gerais.

Primeiro relato da ocorrência de Fusarium oxysporum, raça 2, no município de Piau, em Minas Gerais e, provavelmente, no Brasil

EMBRAPA cria Programa Nacional de Pesquisa de Babacu.

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