摘要:
The invention provides a lubricating composition containing an oil of lubricating viscosity and a hydrogenated copolymer of an olefin block and vinyl aromatic block, wherein the copolymer is optionally functionalized. The invention further provides a method for preparing a hydrogenated copolymer; and the use of the lubricating composition.
摘要:
A zip fastener comprises a pair of tapes and coupling elements along adjacent edges of the tapes. The tapes are partly cut away to form a gap into which an end stop is moulded. The end stop is provided so as to extend along the tape edges away from the fastener coupling elements.
摘要:
The use of alkoxylates and nitrogen containing detergents in a fuel additive composition to prevent intake valve sticking and reduce intake valve deposits.
摘要:
A multi-port liquid bridge (1) adds aqueous phase droplets (10) in an enveloping oil phase carrier liquid (11) to a draft channel (4, 6). A chamber (3) links four ports, and it is permanently full of oil (11) when in use. Oil phase is fed in a draft flow from an inlet port (4) and exits through a draft exit port (6) and a compensating flow port (7). The oil carrier and the sample droplets (3) (“aqueous phase”) flow through the inlet port (5) with an equivalent fluid flow subtracted through the compensating port (7). The ports of the bridge (1) are formed by the ends of capillaries held in position in plastics housings. The phases are density matched to create an environment where gravitational forces are negligible. This results in droplets (10) adopting spherical forms when suspended from capillary tube tips. Furthermore, the equality of mass flow is equal to the equality of volume flow. The phase of the inlet flow (from the droplet inlet port (5) and the draft inlet port (4) is used to determine the outlet port (6) flow phase.
摘要:
A connecting assembly (14) comprises a first connector (10) defining a profiled portion (16) and a second connector (12) comprising a coupling member (18) adapted to be translated to selectively engage with the profiled portion (16) of the first connector (10). The assembly (14) also comprises a supporting member (20) adapted to be translated to selectively secure said coupling member (18) in engagement with the profiled portion (16) of the first connector (10). Drive means (21) is contained within one of the first and second connectors (10, 12) and is adapted to translate the supporting member (20). One disclosed use of the connecting assembly (14) is in a wellbore tool deployment system.
摘要:
A device for the transmission of electrical energy includes at least one current converter. Each current converter has phase elements with respective arrangements of circuit elements that comprise at least two switchable power semiconductors each and at least two free-wheeling diodes, each connected in parallel thereto, and energy storing means. The transfer properties in or between power distribution networks are improved with the novel device. The device is provided with means for controlling the current converter in such a manner that the zero crossing, the amplitude and/or the instantaneous values of an alternating current of a transfer network that can be connected to the device and/or the direct current of a direct current line that connects at least one current converter to a direct current source, and/or the direct voltage and the direct current of at least three interconnected current converters can be controlled.
摘要:
The present invention generally relates to devices, systems, and methods for acquiring and/or dispensing a sample without introducing a gas into a microfluidic system, such as a liquid bridge system. An exemplary embodiment provides a sampling device including an outer sheath; a plurality of tubes within the sheath, in which at least one of the tubes acquires a sample, and at least one of the tubes expels a fluid that is immiscible with the sample, in which the at least one tube that acquires the sample is extendable beyond a distal end of the sheath and retractable to within the sheath; and a valve connected to a distal portion of the sheath, in which the valve opens when the tube extends beyond the distal end and closes when the tube retracts to within the sheath.
摘要:
The present invention relates to a method of lubricating an aluminium-composite surface by supplying to the aluminium composite surface (typically an internal combustion engine aluminium surface) a lubricating composition comprising an oil of lubricating viscosity and an ashless antiwear agent.
摘要:
The use of alkoxylates and nitrogen containing detergents in a fuel additive composition to prevent intake valve sticking and reduce intake valve deposits.
摘要:
A bridge (30) comprises a first inlet port (31) at the end of a capillary, a narrower second inlet port (32) which is an end of a capillary, an outlet port (33) which is an end of a capillary, and a chamber (34) for silicone oil. The oil is density-matched with the reactor droplets such that a neutrally buoyant environment is created within the chamber (34). The oil within the chamber is continuously replenished by the oil separating the reactor droplets. This causes the droplets to assume a stable capillary-suspended spherical form upon entering the chamber (34). The spherical shape grows until large enough to span the gap between the ports, forming an axisymmetric liquid bridge. The introduction of a second droplet from the second inlet port (32) causes the formation of an unstable funicular bridge that quickly ruptures from the, finer, second inlet port (32), and the droplets combine at the liquid bridge (30). In another embodiment, a droplet (55) segments into smaller droplets which bridge the gap between the inlet and outlet ports.