...................................................................................................................... vi LIST OF TABLES ............................................................................................................. ix INTRODUCTION ...............................................................................................................1 MENA REGION PRE-ARAB ...

U nlike treatment with conventional labial brack­ ets, lingual orthodontics relies on constriction mechanics, since the brackets are placed behind the center of resistance of the teeth. This makes space opening for the alignment of blocked­out anterior teeth one of the major challenges of lingual treatment. Insertion and compression of an open­ coil spring are difficult and technique­sensitive ...

In recent years, there has been an increase in the development of medical robots to enhance interventional MRI-guided therapies and operations. Magnetic resonance imaging (MRI) surgical are particularly attractive due their ability provide excellent soft-tissue contrast during these procedures. This paper describes a novel design for tendon-driven gripper that utilizes four shape memory alloy (...

introduction: one of the major causes of image non-uniformity in mri is due to the existence of  non-homogeneity in rf receive and transmit. this can be the most effective source of error in  quantitative  studies  in  mri  imaging.  part  of  this  non-homogeneity  demonstrates  the  characteristics of rf coil and part of it is due to the interaction of rf field with the material being  imaged...

A gripping device actuated by shape memory alloy (SMA) wire was fabricated and investigated. The actuation mechanism and the working rinciple of the gripping device are simple. A SMA wire was used to close the gripper during operation and a torsion spring was integrated to open he gripper when the SMA wire relaxed. Several experiments were conducted to investigate the performance of the grippin...

The superelastic behavior of coil springs of a Ti-Ni shape memory alloy was investigated using loading-unloading cycling tests under isothemal temperatures. The effects of the Ni content and shape memory treatment temperatures on the cyclic behavior in the superelastic deformation were investigated. The deformation behavior within the elastic region of the parent phase scarcely changes during t...

2. Experiment,aZs A c o i l s p r i n g w i t h a f r e e l e n g t h o f 100 mm a t 20°C and an average d i a m e t e r o f 16 mm w i t h e f f e c t i v e number o f t u r n o f 23 was s u p p l i e d by P r o t e u s (F4e ta l lu rg i e Hoboken-Overpel t , Hoboken and N . V . B e k a e r t S .A . , Zwevegem, i n c o o p e r a t i o n w i t h K a t h o l i e k e U n i v e r s i t e i t L e u ...