Abstract: Methods and apparatus for instance migration to support rapid recovery from correlated failures are described. A failure event affecting one or more compute instances of a provider network, including a particular compute instance hosted at a first instance host, is detected based on an analysis of health status information. A determination is made as to whether a particular compute instance meets an acceptance criterion for a failure-induced migration. The acceptance criterion may be based on storage-related requests from the particular compute instance. If the particular compute instance meets the acceptance criterion, one or more configuration operations are initiated to re-launch the particular compute instance at a different instance host.

Abstract: A compact hydrogen generator for use with fuel cells and other applications includes a hydrogen membrane reactor having a combustion chamber and a reaction chamber. The two chambers are have a fluid connection and a heat exchange relationship with one another. The hydrogen generation apparatus also includes a fuel supply, a fuel supply line for transporting fuel from the fuel supply to the reaction chamber, an oxygen supply, an oxygen supply line for transporting oxygen from the oxygen supply to the combustion chamber, as well as a tail gas supply line for transporting tail gas supply line for transporting tail gases from the reaction chamber, a combustion by-product line for transporting combustion by-products for the combustion chamber, and a reaction product line for transporting hydrogen from the reaction chamber.

Abstract: A hydrogen generation apparatus employs a thermocatalytic reactor (60) formed of a top plate (62), a bottom plate (66), and a reactor core (64) disposed between the top an bottom plates. The reactor core has a reaction surface (64a) and a combustion surface (64b), each surface having a raised periphery defining opposing ends (61a and 61b) and opposing sides (63a and 63b). The reaction surface (64a) and the top plate (62) together define a reaction chamber and the combustion surface (64b) and the bottom plate (66) together define a combustion chamber. The reaction core (64) has a first set of a plurality of spaced apart, substantially straight radiating fins (76a) extending from the reaction surface (64a) and a second set of a plurality of spaced part, substantially straight radiating fins (76b) extending from the combustion surface (64b).

Abstract: The present disclosure provides teachings relating to ammonia-based hydrogen generation apparatus and associated methods of use. Exemplary methods and apparatus comprise a thermocatalytic hydrogen generation reactor which includes a reaction chamber containing a catalyst-coated substrate, and a combustion chamber containing a catalyst-coated substrate. Exemplary catalyst-coated substrates include, but are not limited to, metal foam, monolith, mesh, ceramic foam or ceramic monolith.

Abstract: A hydrogen generator comprising a hydrogen membrane reactor, a fuel supply, a reaction fuel supply line, an air supply, an air supply line, a combustion fuel supply line, a tail gas supply line, a combustion by-product line for transporting combustion by-products from the combustion chamber, and a reaction product line. A membrane assembly to be joined to a reactor chamber of a hydrogen generator, which comprises a membrane; and a membrane support comprising a sintered porous metal. A reactor assembly comprising a reaction chamber containing a porous metal substrate, two membrane assemblies, a fuel supply, a reaction fuel supply line, and a tail gas supply line and a reaction product line. Methods associated with the hydrogen generator, membrane assembly and reactor assembly.

Abstract: A downhole tool including a selectively releasable joint, a downhole drilling assembly including the downhole tool, and a corresponding method. In one embodiment of the invention, a downhole drilling assembly includes a downhole tool having a first body and a second body mounted for relative rotation; a joint part for use in forming a selectively releasable joint between the second body and a part of the assembly coupled to the second body; and one or more locking member(s) for locking the first and second bodies relative to one another against relative rotation so as to allow a release force to be applied through the first body to release the releasable joint and allow the tool to be separated from the part of the assembly.

Abstract: The gas cylinder lift is a hydraulic jack mounted on a frame and secured to a mobile cart. The jack lifts a support post, which is guided by a slot running vertically up a guide post. A bucket connected to the bottom of the support post is adapted to hold heavy welding machine gas cylinders or other similar containers. A safety chain or line secured at the top of the support post, and another safety line in the form of an elastic cable or bungee cord, along the bucket help stabilize the cylinders during transport. A safety bolt locks the support post to the guide post during transport to prevent the support post and bucket from moving. Other items, such as welding accessories, may be transported on the cart platform.

Abstract: An earth boring tool includes two coaxially-aligned, positive displacement motors. One motor turns a pilot bit and the other turns a reamer concentric with the pilot bit. The central bit bores the center of the hole and the reamer enlarges it. The central bit is rotated relatively faster, while rotation of the larger diameter reamer is relatively slow. The tool can thus be used to bore larger diameter holes without slowing drilling rates or adversely affecting performance of the cutter elements due to higher tangential velocities.

Abstract: The invention relates to a downhole tool including a selectively releasable joint, a downhole drilling assembly including the downhole tool, and to a corresponding method. In one embodiment of the invention, a downhole drilling assembly includes a downhole tool having a first body and a second body mounted for relative rotation; a joint part for use in forming a selectively releasable joint between the second body and a part of the assembly coupled to the second body; and one or more locking member(s) for locking the first and second bodies relative to one another against relative rotation so as to allow a release force to be applied through the first body to release the releasable joint and allow the tool to be separated from the part of the assembly.

Abstract: A hydrogen generation apparatus employs a thermocatalytic reactor (60) formed of a top plate (62), a bottom plate (66), and a reactor core (64) disposed between the top an bottom plates. The reactor core has a reaction surface (64a) and a combustion surface (64b), each surface having a raised periphery defining opposing ends (61a and 61b) and opposing sides (63a and 63b). The reaction surface (64a) and the top plate (62) together define a reaction chamber and the combustion surface (64b) and the bottom plate (66) together define a combustion chamber. The reaction core (64) has a first set of a plurality of spaced apart, substantially straight radiating fins (76a) extending from the reaction surface (64a) and a second set of a plurality of spaced part, substantially straight radiating fins (76b) extending from the combustion surface (64b).

Abstract: Disclosed is a sorbent device that includes a and sorbent assembly containing a plurality of layered sorbent plates. Each sorbent plate has opposing sorbent surfaces formed of a layer of a sorbent material affixed to each side of a planar support sheet. The sorbent plates are layered so that each of the opposing sorbent surfaces is adjacent to one of the opposing sorbent surfaces on another of the sorbent plates and spaced apart from one another to form a channel between each pair of adjacent opposing sorbent surfaces. An inlet valve provides fluid communication between the sorbent assembly and a gas source, while a two-way outlet valve fluid communication between the sorbent assembly and a processor or a vacuum pump.

Abstract: A vehicle door drain slot plug includes a base portion having opposing sides and opposing ends, the base portion being adapted to substantially cover the drain slot. First and second snap-tabs extend from the base portion near the opposing ends on one of the sides for securing the base portion with respect to the slot. A plurality of stand-off members extend from the one side of the base portion and are spaced about the periphery of the base portion for engaging the vehicle door to create a gap between the base portion and the vehicle door in order to allow water to drain out of the slot.

Abstract: A stabilization device for a down-hole motor for use in drilling operations for example in oil-fields to control any tendency for spiralling of the tool bit during the drilling action and to permit steering by a "orientate and rotate" technique. In an example of the device, an end portion of a motor shaft (26) projects from a motor body (20), the projecting portion being comprised of an attachment apparatus or bit box (28) by which a tool bit (38) is connected for rotation. The bit box (28) may be separable from the shaft (26) or may be integrally formed therewith, but, is provided with a stabiliser means (32) in the form of part-helical vanes surrounding the bit box (28). The bit (38), when secured in the box (28), is located immediately adjacent the stabilising vanes (32) for maximum control; additionally, stabiliser vanes (22,24) may be provided on the motor body portion (20) and, if required, on the selected tool bit.