Кварцевое стекло, полученное на плазмотронах ОАО "Динур" из раменского песка: особенности кристаллизации на полированной поверхности

The raw material for melting quartz glass at JSC "DINUR" is quartz sand produced by Ramenskoye mining and processing plant (GOK). The performance of reactors (plasmatrons) and the quality of the ingots obtained significantly depend on the quality of Sands (the content of impurity components such as aluminum and iron oxides). It is established that the product of melting quartz sand from the feedstock with a high content of impurities is characterized by reduced resistance to crystallization.

Soils and agriculture in central-west and north Brazil

Modern soil science, spearheaded by research in Brazil has facilitated the utilization of vast areas of previously uncultivated soil long considered unsuitable for human food production into highly productive agricultural land. Naturally acid soils with high contents of aluminum and iron oxides and low CEC values and organic matter contents long considered insurmountable obstacles to crop production in tropical latitudes could be extremely productive. With continued development of the infrastructure needed by commercial agriculture Brazil has the potential to lead the world in its quest to provide food for growing human populations.