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Abstract. Analytical formulas for the temperature dependence of elastic constants of MgO combined with a thermodynamic model, which interconnects bulk properties to point defect parameters, can successfully reproduce the self diffusion coefficients of periclase at temperatures representative of the Earth's mantle conditions. Although the calculated diffusion coefficients are estimated from a single measurement and cover a broad range of values (i.e. five orders of magnitude), an almost excellent agreement with the experimental ones is observed. The slight discrepancy at the highest temperature lies at error margins.

This exploratory study applied Everett Rogers's diffusion framework to the global phenomenon of countries adopting freedom of information laws. The external influence of geographic proximity and the internal influence of news media were examined over time. The models indicated that a strong environment for news media had a significant influence on legislation adoption in United Nations member states ( N = 192). The models also showed that Europe, followed by the Americas, had the greatest influence on diffusion among the regions, with a predicted trajectory indicating 80% of nations adopting the legislation by 2025 in challenging environments.

Some useful simplification of the theory of political mobilization is achieved by treating the ideology of a mobilizing agent as an innovation. The process of political mobilization is then treated as a process of innovation diffusion. This perspective allows the development of the necessary linkage between the micro- & macro-level components of the process. The theory is tested using extended time series for seven societies -- the US, UK, Sweden, Nazi Germany, Fascist Italy, the USSR, & the People's Republic of China -- & is supported. 8 Tables, 7 Figures, 1 Appendix, 16 References. HA.