Results 151 to 160 of about 347,742 (199)
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Alumina-Alumina and Alumina-Polyethylene Total Hip Prostheses
2004By the late 1960s, the Charnley hip implant system with a metallic femoral stem and an ultrahigh molecular weight polyethylene (UHMWPE) acetabular component was the primary design for successful total hip arthroplasty (THA). Many of today’s concerns regarding the Charnley system were recognized as early as 1970.
Julie A. Miller +2 more
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Evolution of Alumina-on-Alumina Implants
Clinical Orthopaedics and Related Research, 2000The use of alumina-on-alumina sliding surfaces for total hip replacement is becoming increasingly popular. The author has reviewed the 30-year history of this material. Technical aspects such as the quality of the material, quality of the design, and the risk of fracture are presented.
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ALUMINA-ON-ALUMINA TOTAL HIP ARTHROPLASTY
The Journal of Bone and Joint Surgery-American Volume, 2005Ceramic-on-ceramic couplings are attractive alternative bearing surfaces that have been reported to eliminate or reduce problems related to polyethylene wear debris. Disappointing experiences with alumina ceramic bearings in the past have led to many improvements in the manufacture and design of ceramic implants. The purpose of the present study was to
Jeong Joon, Yoo +5 more
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Angewandte Chemie, 2001
Anodization of aluminum with H2 SO4 on an Si substrate results in the formation of individual alumina nanotubes (ANTs). The picture shows an ANT with a length of 650 nm and internal and external diameters of 12 and 35 nm, respectively. Detailed studies by transmission electron microscopy revealed that the ANTs are completely detached cells of the ...
Lin, Pu +3 more
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Anodization of aluminum with H2 SO4 on an Si substrate results in the formation of individual alumina nanotubes (ANTs). The picture shows an ANT with a length of 650 nm and internal and external diameters of 12 and 35 nm, respectively. Detailed studies by transmission electron microscopy revealed that the ANTs are completely detached cells of the ...
Lin, Pu +3 more
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Engineering aspect of alumina on alumina hip prosthesis
Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine, 2007Alumina on the alumina sliding system in a total hip replacement is recognized as a breakthrough in orthopaedic surgery. Advantages and problems with this material are explained and discussed in the light of 36 years of clinical application. Laboratory data as well as clinical ones are summarized.
L, Sedel, A, Raould
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Hydraulic Alumina Binder for Extrusion of Alumina Ceramics
Journal of the American Ceramic Society, 2007The present work describes the effect of hydraulic alumina (HA) as a new inorganic binder on extrusion of alumina ceramics. The addition of a small amount of HA imparted significant flowability and rigidity to the extruded alumina.
Takaaki Nagaoka +4 more
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Hydrogen sulfide adsorption on alumina, modified alumina, and molybdenum trioxide/alumina
The Journal of Physical Chemistry, 1986A systematic investigation of H/sub 2/S adsorption on Al/sub 2/O/sub 3/, modified Al/sub 2/O/sub 3/, and MoO/sub 3//Al/sub 2/O/sub 3/ catalysts was carried out by using temperature-programmed desorption techniques, coupled with IR and XPS. SiO/sub 2/-Al/sub 2/O/sub 3/ and AlPO/sub 4/ were also studied for comparison. It was found that Al/sub 2/O/sub 3/
Yasuaki Okamoto +4 more
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Journal of the American Ceramic Society, 2002
The densification kinetics and mechanism of a low‐temperature cofirable borosilicate glass (BSG) + alumina during the constrained sintering of a sandwich structure of alumina/(BSG + alumina)/alumina has been studied. The densification kinetics becomes slower when the BSG + alumina tape is constrained during firing.
Yun‐Chiang Lin, Jau‐Ho Jean
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The densification kinetics and mechanism of a low‐temperature cofirable borosilicate glass (BSG) + alumina during the constrained sintering of a sandwich structure of alumina/(BSG + alumina)/alumina has been studied. The densification kinetics becomes slower when the BSG + alumina tape is constrained during firing.
Yun‐Chiang Lin, Jau‐Ho Jean
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1992
The bauxite reserve base is estimated at 28000 million tonnes, and total world resources are estimated at 55000 to 75000 million tonnes (South America 33%, Africa 27%, Asia 17%, Australasia 13% and elsewhere 10%).
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The bauxite reserve base is estimated at 28000 million tonnes, and total world resources are estimated at 55000 to 75000 million tonnes (South America 33%, Africa 27%, Asia 17%, Australasia 13% and elsewhere 10%).
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