introduction: the survival of an implant system is affected by the choice of antirotational design, which can include an external or internal hex. implant success also is affected by the maintenance of the crestal bone around implants. the aim of present study was to evaluate the crestal bone loss and clinical parameters related to bone loss in patients loaded with an external or internal hex 3...

tarikh-e jahangosha is the most important work about kharazmshahian and the mongols. utilising imagery, rhetoric, abundant persian and arabic poems, quranic verses and traditions, and proverbs have caused the prose to resemble poetry, fading its historical goals. here, quoting verses from the mythological parts of shahnameh, rostam and sohrab stories (37verses), and rostam and esfandiar (26 ver...

Results of an experimental investigation of the seismic performance of prefabricated column-footing connections are presented. Tests were conducted on six 1/4-scale prefabricated column specimens inserted into prefabricated footings in two Groups. Group-1 consisted of four specimens, which were tested under constant axial load and cyclic inelastic lateral displacements. The remaining two specim...

Galois connections play a very important role in the theory of continuous lattices and their various generalizations. (See, for example, [1], [2], [a], [4], [5], [7] and [9].) Morphisms of continuous lattices, as defined in [2], are precisely those upper adjoints of Galois connections which preserve directed sups. In [1] Bandelf and Ernd suggested that the right choice of morphisms for Z-contin...

In this paper, we propose a protocol for the construction and maintenance of multipoint connections (MCs). The protocol is based on link-state routing: information regarding multipoint connections is broadcast to network switches, which perform all computations locally. The protocol is generic in that it can be used with MCs of diierent types, including symmetric MCs, receiver-only MCs, and asy...

There is a definite relationship between the phyllotactic fraction and the sympodia uniting median leaf traces in a stem. The denominator of the phyllotactic fraction is the number of sympodia in the -stem, and the numerator is the -number of sympodia counted in passing from the sympodium of one leaf to that of an adjacent leaf on the genetic helix. This relationship holds for species with clos...

moment-resisting frames have extensive usage in earthquake-prone areas and high ability in energy dissipation.after the earthquake in northridge 1994,kobe 1995 fixed connections of steel structures have shown poor performance and generally they were caught brittle fracture of beam flange weld to the column.in order to remedy to avoid similar situations in future earthquakes,researchers introduc...