Spontaneous combustion of coals and coal-shales

Spontaneous combustion of coal is a well-known phenomena around the globe.Apart from the coal itself, burning coal-shales is becoming a problem in the South African coal mines.Serious incidents of spontaneous combustion have been reported as a result of self-heating of reactive coal-shales.The intrinsic properties and spontaneous combustion tests o

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The professional pedagogical praxis of teachers in technical and vocational education and the contextualization of science, technological innovation and environment

The work reveals an epistemological approach, from which it is understood that the postgraduate education of teachers of Technical and Vocational Education as an intentional process has to become a Slide Powder conscious action of systematized development of pedagogical professional knowledge that is tempered with the demands of the Contemporaneity

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