Abstract: A key assembly is press fit into an annular space between a box and pin member to resist relative rotation of the box and pin members. The key assembly includes wedge like members that contact one another along complementary tapered surfaces, and when in contact generate radial forces into the box and pin member to secure the connection between the box and pin. The outer wedge is inserted first into the annular space between the box and pin members, and has rows of elongate teeth that project radially outward into contact with an inner surface of the box member. Because the outer wedge is pushed radially outward against the box member rather than axially sliding therebetween, the teeth protrude into the surface of the box member thereby increasing the anti-rotation force created by the outer wedge.

Abstract: A system for joining pipe segments, the system including a first pipe connector connected to a first pipe segment, and a second pipe connector threadingly connectable to the first pipe connector, and connected to a second pipe segment. The system further includes a recess in the outer surface of the first pipe connector, and an elongated key having first and second lengthwise surfaces. One of the lengthwise surfaces has protrusions that embed into a transverse surface of the second pipe connector when the key is mounted into the recess. The thickness of the key decreases with distance radially inward from the outer surface.

Abstract: A key assembly is press fit into an annular space between a box and pin member to resist relative rotation of the box and pin members. The key assembly includes wedge like members that contact one another along complementary tapered surfaces, and when in contact generate radial forces into the box and pin member to secure the connection between the box and pin. The outer wedge is inserted first into the annular space between the box and pin members, and has rows of elongate teeth that project radially outward into contact with an inner surface of the box member. Because the outer wedge is pushed radially outward against the box member rather than axially sliding therebetween, the teeth protrude into the surface of the box member thereby increasing the anti-rotation force created by the outer wedge.

Abstract: A system for joining pipe segments, the system including a first pipe connector connected to a first pipe segment, and a second pipe connector threadingly connectable to the first pipe connector, and connected to a second pipe segment. The system further includes a recess in the outer surface of the first pipe connector, and an elongated key having first and second lengthwise surfaces. One of the lengthwise surfaces has protrusions that embed into a transverse surface of the second pipe connector when the key is mounted into the recess. The thickness of the key decreases with distance radially inward from the outer surface.

Abstract: A method and apparatus for use in the field of speaker verification. The invention provides a method and apparatus for generating a pair of data elements, namely a first element representative of a speaker specific speech pattern and a second element representative of a biased normalizing template, the pair of data elements being suitable for use in a speaker verification system. The invention provides receiving an audio signal representative of a training token associated with a given speaker and processing the training token on a basis of a reference speaker independent model set to derive a speaker independent normalizing template. The invention further provides processing the training token on a basis of a reference speaker independent model set for generating a speaker specific speech pattern. The speaker specific speech pattern and the speaker independent normalizing template are then processed to derive a biased normalizing template.