摘要:
This invention relates to non-Group 4 transition metal compositions useful as olefin polymerization catalysts, wherein the transition metal is in a high oxidation state. The invention further relates to design of new ligand systems and methods of preparing and using the same. Compositions useful as catalyst precursors are neutral transition metal complexes comprising the unique ligand systems of the invention. The inventive compositions may be activated to a catalytic state by ion-exchange reagents or by Lewis acids.
摘要:
This invention relates to processes using non-Group 4 transition metal compositions useful as olefin polymerization catalysts, wherein the transition metal is in a high oxidation state. The invention further relates to design of new ligand systems and methods of preparing and using the same. Compositions useful as catalyst precursors are neutral transition metal complexes comprising the unique ligand systems of the invention. The inventive compositions may be activated to a catalytic state by ion-exchange reagents or by Lewis acids.
摘要:
A self-contained vehicle safety system is provided which can be easily installed in an automotive vehicle at occupant seating positions lacking airbag protection. Each system employs a canister containing a collapsed airbag and a compressed gas cylinder. A septum isolates the reservoir from the bag and from an air filled pneumatic line with a puncturing element that is located adjacent the septum. The pneumatic line leads to an actuator housing that preferably contains at least one linear, cylindrical passageway in which a piston is mounted for reciprocal movement. A biasing spring normally holds the piston at a position in the cylindrical cavity remote from a pressure transmission port coupled to the pneumatic line. However, in the event of a collision the inertial mass of the piston overcomes the spring and travels along the cylindrical cavity passage in the actuator housing. This compresses air within the actuator housing and expels the compressed air through the pressure transmission port and into the pneumatic line. The air pressure in the pneumatic line is directed to the piercing element, which punctures the reservoir septum, thereby releasing compressed air which immediately inflates the airbag.
摘要:
Continuous flat unidirectional flat ribbons, which have been precut from an impregnated fiber reinforced-matrix composite tape so as to have a substantially greater width than thickness, are interlaced in over-and-under relationship in 0 degree and 90 degree directions into the form of a continuous, multi-directional seamless tube. The tube may be cut into tubular sections, which then are subjected to temporary heat and pressure so that the matrix fuses the interlaced ribbons to form an integral tube. The elongated seamless tube also may be cut into planar sections and used to form integral members of planar or contoured construction. The integral members may be formed of a single layer of the interlaced material, or of laminated construction from multiple layers of the interlaced material, with the ribbons of each layer either extending parallel, at an angle other than 0 degrees/90 degrees, aligned, or offset, with respect to the ribbons in the other layer(s). The formed members may have interlaced ribbons of different types and/or contain different types of fibers in different sections of the members, to provide the members with different structural characteristics.
摘要:
This invention relates to peptides involved in the pathogenesis of human immunodeficiency virus ("HIV"). More particularly, this invention relates to peptides from the env region of the HIV genome and the use of such peptides in methods and compositions for preventing, treating, or detecting acquired immune deficiency syndrome ("AIDS") infection.
摘要:
Shoes for horses are fabricated from a plastic material which is reinforced by kinked metal wire. The shoes are lightweight, readily formable, have good wear properties and are much easier on the horse than metal shoes. The reinforced plastic material is also useful for fabrication of hoof pads.
摘要:
Continuous flat unidirectional flat ribbons, which have been precut from an impregnated fiber reinforced-matrix composite tape so as to have a substantially greater width than thickness, are interlaced in over-and-under relationship in 0 degree and 90 degree directions into the form of a continuous, multi-directional seamless tube. The tube may be cut into tubular sections, which then are subjected to temporary heat and pressure so that the matrix fuses the interlaced ribbons to form an integral tube. The elongated seamless tube also may be cut into planar sections and used to form integral members of planar or contoured construction. The integral members may be formed of a single layer of the interlaced material, or of laminated construction form multiple layers of the interlaced material, with the ribbons of each layer either extending parallel, at an angle other than 0/90 degrees, aligned, or offset, with respect to the ribbons in the other layer(s). The formed members may have interlaced ribbons of different types and/or contain different types of fibers in different sections of the members, to provide the members with different structural characteristics.
摘要:
This invention relates to peptides involved in the pathogenesis of human immunodeficiency virus ("HIV"). More particularly, this invention relates to peptides from the env region of the HIV genome and the use of such peptides in methods and compositions for preventing, treating, or detecting acquired immune deficiency syndrome ("AIDS") infection.
摘要:
A layout tool for defining points on rolled metal H beams comprises a U shape frame having a hand hold in the bight of the U. One leg of the frame is longer than the other and terminates at its end in a stabilizing and guide member extending perpendicular thereto. The guide member has a flat wear surface adapted to be positioned against the working line of the beam on the external surface of the beam to which all measurements are taken. The other leg of the frame slidingly supports in a channel provided therein a T scale having a flat stabilizing base member adapted to rest on the web of the beam. A locking mechanism is provided in the second leg which includes a thumb screw for locking the scale in position in the channel. The scale is disposed at right angles to the legs and the stabilizing and guide member such that the layout tool allows orthogonal lines to be scribed in any one position of the tool.