Porous ceramic materials are currently used as volumetric sunlight absorbers in concentrating solar power systems. As the efficiency of thermodynamic cycles rapidly increases with the operating temperature, the favorable characteristics of so-called ultra-high temperature ceramics (UHTCs) can be successfully exploited in novel solar absorbers. The present work reports, for the first time to the...

The development of markets for low-carbon energy sources requires reconsideration issues related to extraction and use oil gas. Significant reserves hydrocarbons are concentrated in Arctic territories, e.g., 30% the world’s undiscovered natural gas 13% oil. Associated petroleum gas, condensate could be able expand scope their applications. Natural is main raw material production hydrogen ammoni...

The conservation of crop genetic resources requires understanding the different variables-cultural, social, and economic-that impinge on crop diversity. In small-scale farming systems, seed exchanges represent a key mechanism in the dynamics of crop genetic diversity, and analyzing the rules that structure social networks of seed exchange between farmer communities can help decipher patterns of...