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A method of removing trace contaminants, such as mercury, from a flue gas by passing the gas over a sorbent structure on which is coated a renewable layer of sorbent. The sorbent structure can be a tube or plate and can be porous or non-porous and is placed inside a duct through which the flue gas f

A method of removing trace contaminants, such as mercury, from a flue gas by passing the gas over a sorbent structure on which is coated a renewable layer of sorbent. The sorbent structure can be a tube or plate and can be porous or non-porous and is placed inside a duct through which the flue gas flows. The sorbent particles comprise noble metal or activated carbon particles and can be injected into the gas stream before it passes over the sorbent structures. The sorbent structures can be periodically recoated with sorbent while the gas is still flowing.

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A method of removing trace contaminants, such as mercury, from a flue gas by passing the gas over a sorbent structure on which is coated a renewable layer of sorbent. The sorbent structure can be a tube or plate and can be porous or non-porous and is placed inside a duct through which the flue gas f

A method of removing trace contaminants, such as mercury, from a flue gas by passing the gas over a sorbent structure on which is coated a renewable layer of sorbent. The sorbent structure can be a tube or plate and can be porous or non-porous and is placed inside a duct through which the flue gas flows. The sorbent particles comprise noble metal or activated carbon particles and can be injected into the gas stream before it passes over the sorbent structures. The sorbent structures can be periodically recoated with sorbent while the gas is still flowing. the bone engaging surface is devoid of a step or a corner. 2. The device of claim 1 wherein the bone engaging surface being devoid of a step or a corner prevents the application of undue stress to the surrounding bone. 3. The device of claim 1 when used as a replacement for the acetabular component of a hip joint. 4. The device of claim 1 wherein the first rate of decrease in cross-sectional diameter of the socket member is linear. 5. The device of claim 1 wherein the second rate of decrease in cross-sectional diameter of the socket member is logarithmic or exponential. 6. The device of claim 1 wherein, the second rate of decrease in cross-sectional diameter of the socket member varies as the second surface portion extends away from a line of meeting with the first surface portion and the second surface portion. 7. The device of claim 1 wherein the first surface portion is defined by a frustoconical section of the socket member and the second surface portion is defined by a spherical section of the socket member. 8. The device of claim 7 wherein the frusto-conical section of he socket member is oriented so that its smallest cross-sectional diameter meets, circumferentially, with a hemisphere formed by the spherical section and its largest cross-sectional diameter meets, circumferentially, with the first surface of the socket member. 9. The device of claim 1 wherein the socket member is cotyloidal in configuration with a longitudinal axis. 10. The device of claim 1 wherein the first surface of the socket member comprises a relatively planar surface into which the bearing surface forms an indent. 11. The device of claim 1 wherein the socket member is made from any one of the group comprising metals, ceramics, or carbon fibre. 12. The device of claim 1 wherein the bearing surface of the socket member is made from a material of higher wear resistance relative the remaining material of the socket member. 13. The device of claim 12 wherein the bearing surface is made from polyethylene or a ceramic material. 14. The device of claim 1 wherein a shell of polyethylene having a shape which corresponds with the bearing surface is fitted to the bearing surface. 15. The device of claim 14 wherein an interface formed between the bearing surface of the socket member and the shell is surface-coated with titanium nitrate or titanium carbide.