E-Learning as a Cultural Artifact. An empirical study of Iranian Virtual Institutions

Choice, design and use of technology in education settings can be dependent on culturally embedded norms, i.e., assumptions about the nature of knowledge, ways of communications, kinds of teaching and learning strategies\ud and methods, etc. By discussing the culturally inscribed norms in this article, it is argued that on the design and use of e-learning in the perspective of globalization it is critically important to recognize, understand and thus take into account the cultural situatedness. Drawing on the literature, we present a model of culturalpedagogical paradigms in higher education in general and e-learning in particular. We use this model to explore cultural-pedagogical orientations in Iranian Virtual Institutions as an instance of a developing country. This is done in a comparative perspective, looking for similarities of the teacher’s and learner’s points of view

Can Compactifications Solve the Cosmological Constant Problem?

Recently, there have been claims in the literature that the cosmological constant problem can be dynamically solved by specific compactifications of gravity from higher-dimensional toy models. These models have the novel feature that in the four-dimensional theory, the cosmological constant $\Lambda$ is much smaller than the Planck density and in fact accumulates at $\Lambda=0$. Here we show that while these are very interesting models, they do not properly address the real cosmological constant problem. As we explain, the real problem is not simply to obtain $\Lambda$ that is small in Planck units in a toy model, but to explain why $\Lambda$ is much smaller than other mass scales (and combinations of scales) in the theory. Instead, in these toy models, all other particle mass scales have been either removed or sent to zero, thus ignoring the real problem. To this end, we provide a general argument that the included moduli masses are generically of order Hubble, so sending them to zero trivially sends the cosmological constant to zero. We also show that the fundamental Planck mass is being sent to zero, and so the central problem is trivially avoided by removing high energy physics altogether. On the other hand, by including various large mass scales from particle physics with a high fundamental Planck mass, one is faced with a real problem, whose only known solution involves accidental cancellations in a landscape.Comment: 7 pages in double column format. V2: Updated references. Published in JCA