Abstract: Techniques are described for managing secrets for accessing resources of a computing service provider by a client computing device. Two secrets are created that are valid for accessing the resource by the client computing device. When one of the two secrets are invalid for accessing the resource, the client computing device can use the second of the two secrets to gain access to the resource.

Abstract: Techniques are disclosed for allocating computing resources in a computing network of a cloud computing system, the computing resources comprising a plurality of computing devices hosting virtual machines. An expected usage profile is determined based on first data indicative of a current demand for computing resource usage in the computing network, second data indicative of an adjacent demand for computing resource usage in the computing network, third data indicative of a historical demand for computing resource usage in the computing network, and fourth data indicative of events that are external to the computing network.

Abstract: A microfluidic device comprises first and second inlet passages (13) for respective immiscible fluids, these inlet passages merging into a third passage (8) along which the two fluids flow under parallel laminar flow conditions, the third passage being formed with a constriction or other discontinuity (9) causing the two fluids to form into a flow of alternate segments.

Abstract: A microfluidic device comprises first and second inlet passages (13) for respective immiscible fluids, these inlet passages merging into a third passage (8) along which the two fluids flow under parallel laminar flow conditions, the third passage being formed with a constriction or other discontinuity (9) causing the two fluids to form into a flow of alternate segments.