Abstract:A growing interest in hydrogen use has been observed due to its environmentally friendly characteristics. However, the current methods of hydrogen production from natural gas are based on steam methane reforming, partial oxidation, and autothermal reforming. These processes produce a mixture of hydrogen and carbon oxides and after water-gas shift reactions, in order to increase the production of hydrogen, a large amount of cO 2 is generated and possibly released in the atmosphere. In this context, the catalytic methane decomposition has been receiving attention as an alternative route to the production of cO x -free hydrogen. It has been reported that the appropriate group of catalysts and reactors can lead to a viable process. current investigations attempt to increase the yield of hydrogen. The present work aims to evaluate the processes currently used for that and to present the preliminary results obtained with cobalt catalysts for methane decomposition. A comparison between the conventional processes and the suggested ones is made, and the major advantages in the use of methane decomposition are presented.

RESUMO:O trabalho apresenta uma metodologia para a transmissão de informações com segurança nas aplicações interativas no Sistema Brasileiro de Televisão Digital. O método permite a integridade, confiabilidade e disponibilidade dos parâmetros em uma transmissão. A certificação digital na programação das aplicações digitais é testada com os protocolos das camadas de aplicação e transporte da rede de interatividade. A proposta permite que as aplicações interativas que manipulam dados confidenciais dos usuários possuam rotinas de autenticação do usuário para que não haja modificação de dados no receptor. Dessa forma, a televisão digital terá um procedimento para a segurança para as aplicações interativas. ABSTRACT:The paper presents a methodology for the transmission of information is held securely in interactive applications in the Brazilian System of Digital Television. The method allows the integrity, reliability and availability of the parameters in a transmission. Digital certification program in digital applications is tested with the application layer protocols and transport network interactivity. The proposal allows interactive applications that handle sensitive data of the users have routines for user authentication so that no data modification at the receiver. Thus, digital TV will have a procedure for security for interactive applications.