introduction : the aim of this in vitro study was to compare the effect of gates-glidden and peeso reamer drills on residual dentin thickness during post space preparation in order to discover which method has minimum root structure damage. materials and methods: thirty extracted human maxillary premolars with bifurcations at root middle were horizontally cut 15 mm coronal to the apical end aft...

Abstract This article will consider the ways states have exercised imperialism over Antarctica, focusing on two methods: use of administrative acts and control scientific research resources. The then compare Outer Space Treaty Antarctic System around these methods, as well military capabilities an important aspect imperial control, to question whether space law prohibits imperialism. seeks prev...

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various and complex human activities in geographical contexts need proper ground if at most efficiency is to be achieved. land preparation regulates the relationship between human, space, and human activities. land preparation has various dimensions related to value system, political, scientific, artistic, and defense-security aspects. one of the most important dimensions of land preparation is...

threats are one of the most fundamental problems of our modern societies that daily will affect citizens in urban spaces. this becomes more problematic when the people in their everyday living spaces encounter with behaviors that cause lack of security and should have been feel comfort and their families used these spaces freely. this causes many problems for citizens. in today cities because o...