摘要:
A whipstock (10) has a flowchannel (41) therethrough to facilitate the rapid lowering of the whipstock through liquid in an oil well. A whipstock (10) has a guide surface and a sacrificial element (20) spaced from the guide surface. In use, the sacrificial surface prevents the starting mill damaging the guide surface during the formation of the initial opening in a casing. The undamaged guide surface can later be used for accurately guiding tubulars and tools to help ensure that lateral bores are correctly positioned.
摘要:
A bicycle suspension fork (10) having a primary compression spring assembly (50) positioned in only one of the fork legs (14, 16). A load distributing assembly (52) is positioned in at least one of the fork legs (14, 16) in order to distribute loads transmitted to the fork (10) during a compression stroke. Thus, asymmetrical loading that would occur from the presence of only one compression spring assembly (50) on only one side of the fork is decreased if not completely eliminated. The load distributing assembly (52) preferably is arranged such that it begins load distribution during the last one-half, and most preferably the last one-third of compression stoke travel. A preferred embodiment of the load distributing assembly (52) includes a load distributing spring (80) and a load distributing spring spacer (82).
摘要:
A suspension system (10) for a bicycle or other vehicle or apparatus, the system including at least one telescoping strut comprising a first telescoping member (12) and a second telescoping member (14), the first and second telescoping members being telescopingly and coaxially engaged with each other so that the strut is compressible by relative movement of the telescoping members toward each other and expandable by relative movement away from each other. A piston (16) may be interconnected with the second telescoping member and slidably positioned within the first telescoping member. The piston separates a primary compression spring chamber into two gas chambers (30, 34) connected by an adjustable port, whereby compression or expansion of the strut creates a damping force that resists such relative movement of the telescoping members, resulting in the primary compression spring having a frequency-sensitive spring rate. The crack force, spring rate and other characteristics of the suspension system may be adjusted using a piston location adjuster to adjust the piston height, and/or a negative preload spring to apply a compressive preload force to the telescoping strut.
摘要:
A mill (M) for wellbore milling operations comprises a body (10) with a bore (100) therethrough, at least one milling surface on the body (10) and flow control apparatus within the body for selectively controlling fluid flow through the mill.
摘要:
PCT No. PCT/NO96/00279 Sec. 371 Date Dec. 16, 1998 Sec. 102(e) Date Dec. 16, 1998 PCT Filed Nov. 26, 1996 PCT Pub. No. WO97/20729 PCT Pub. Date Jun. 12, 1997A dampening device for dampening the vertical wave-induced motion component of a floating structure. The dampener projects in the form of a skirt down below the bottom of the floating structure (11) and consists of a plurality of channels (47) which extend substantially horizontally and converge from an inlet opening (27, 28, 36, 37, 38) to an outlet opening (16, 46) leading away from the floating structure (11). When the structure (11) moves downwards water is forced from the underside through the channels (47) and creates a jet effect which acts with dampening effect on the vertical motion of the structure. The dampening device may also be made in the form of an outwardly projecting skirt on the floating structure and consist of a plurality of channels (17), where a number of first passages (27, 28) extend in a substantially vertical direction and merge into a number of second passages (29) which extend in an at least substantially horizontal direction, and thereby force the water from a substantially vertical direction of motion, through the first passages (27, 28), into a horizontal direction of motion through the second passages (29) during a part of the passage through the dampener (12). A combination of the two dampeners, in that the dampener (12) is located immediately above the dampener (13) is also possible.
摘要:
A system is described for conjugating, isolating, and purifying peptides. The system contains an ultrafiltration apparatus which is connected with a reaction vessel reservoir.
摘要:
An electronic program schedule system having virtual channels which includes a receiver for receiving broadcast, satellite or cablecast television programs for a plurality of television channels and a tuner for tuning a television receiver to a selected one of the plurality of channels. A data processor receives and stores in a memory television program schedule information for a plurality of television programs to appear on the plurality of television channels. A user control apparatus, such as a remote controller, is utilized by a viewer to choose user control commands and transmit signals in response to the data processor which receives the signals in response to user control commands. A television receiver is used to display the television programs and virtual channel programming. A video display generator receives video control commands from the data processor and generates and displays a plurality of virtual channels, each virtual channel being accessible as a channel and associated with a service delivered on a subset of the channels.
摘要:
Television programming information comprising an electronic programming guide is compressed by more than fifty percent, and decompressed in environments with only moderate processing power and storage space. The coding scheme of the present invention is based on Huffman coding of characters comprising the electronic programming guide and replacement character strings occuring in the data that have high savings values. A look-up table and binary tree are constructed from the Huffman codes for use in compressing and decompressing the electronic programming guide, and a set-top box for use in the decompression operation is provided.
摘要:
A composition of matter comprising at least 15 % by weight of the compound: 8-C-β-D-[2-O-(E)-cinnamoyl]glycopyranosyl-2-[(R)-2-hydroxy]propyl-7-methoxy-5-methylchromone. This compound, found in very small amounts in leaves of the Aloe barbadensis plant, when concentrated to the desired level, exhibits anti-inflammatory activity.
摘要:
Cell-to-cell transmission of HIV, and thus the sexual transmission of AIDS, is inhibited by the direct application of sulfated polysaccharides to the epithelium of the vaginal mucosa, cervix or penis. Sulfated polysaccharides include carrageenan and dextran sulfate, which may be formulated into a cream, suppository, gel or foam composition, and such compositions are an aspect of the invention.