We retrieved 159 femoral heads at revision surgery to determine changes in surface configuration. Macroscopic wear of the head was observed in three bipolar hip prostheses as a result of three-body wear. There was a considerable change in surface roughness in the internal articulation of bipolar hip prostheses. Roughness in alumina heads was almost the same as that in new cobalt-chromium heads....

background: in the history there are long backgrounds to coexistence of human and domesticated animal. counter effect of more than 150 common diseases threat the human and domesticated health. due to climate condition of mazandaran, in the north of iran, the objective of the present study is to evaluate health conditions of the industrial animal husbandries (iah) during 2000-2001 . methods: thi...

Wireless sensor networks (WSNs) suffers from the hot spot problem where the sensor nodes closest to the base station are need to relay more packet than the nodes farther away from the base station. Thus, lifetime of sensory network depends on these closest nodes. Clustering methods are used to extend the lifetime of a wireless sensor network. However, current clustering algorithms usually utili...

background and purpose: the fact that who is more qualified to teach the emp (english for medical purposes) courses has long been the cause of argument between the heads of language departments (lds) on one side and those of discipline-specific departments(dsds) on the other side. this research was conducted to study the views of both sides as well as those of students in some emp english class...

Wireless sensor network used Clustering techniques to extend the lifetime of the network. LEACH is the one from these clustering techniques to maintain the energy efficiency of sensors. The technique of selecting nodes with highest residual energy as cluster heads with the assumption that energy consumption distribute periodically between the nodes. Cluster heads collect information from the su...