Background: With the arrival of the industrial Century, the educational system changed and different forms of education, including distance Education were created. Firstly, distance education based on traditional learning theories, but because that these theories are not able to respond and solve the challenges facing the education system in the modern century connectivism theory was creat...

The definition of propositional knowledge has been said to be: "knowledge is belief in justified truth" and belief, truth, and justified are necessary and adequate conditions in the actualization of knowledge.  Many faults have been directed towards this three elemental definition, which some of them have been derived from the element of justification. This article reviews some of the most im...

abstract the influence of cation?? and anion?? interactions on the strength and nature of n…h hydrogen bond has been investigated by quantum chemical calculations in s-triazine…3hf complex. ab initio calculations were performed at mp2/6-311++g(d,p) level of theory. the natural bond orbital (nbo) analysis and the bader’s quantum theory of atoms in molecules (aim) were also used to elucidate t...