Abstract: Systems and methods are described for performing at least one of assessing, optimizing and/or controlling the performance of an Anaerobic Digestion (AD) plant. The system comprises a server that provides a user interface for allowing a user to enter user inputs to define various aspects of the AD plant operation and to view results of the simulation; a database for storing the inputs used for the simulation of the anaerobic digestion plant, the inputs including feedstock inputs, AD operational inputs, and simulation criteria; and a simulation engine that can be operated in an at least one of an off-line simulation mode for generating off-line simulator predictions, a near-line simulation mode for optimizing the performance of the system and an online mode for using machine learning to tune the performance of various models used in simulating the operation of the AD plant.

Abstract: A method manages a cluster. A computer system determines a measurement of a process variable for the cluster, wherein the process variable indicates a quality of service for the cluster. The computer system determines a comparison between the measurement of the process variable and a desired value for the process variable. The computer system determines an adjustment to a setpoint for a runtime metric in the cluster based on the comparison, wherein the runtime metric is a control variable for the cluster. The computer system updates the setpoint for the runtime metric in a controller for the cluster using the adjustment, wherein the runtime metric is used by the controller as the control variable to scale a set of resources in the cluster to cause a value of the runtime metric to move towards the setpoint.

Abstract: Objects are managed in a virtual machine. A frequency of access to fields in objects for an application is identified while the application runs in the virtual machine. An object in the objects is split into a hot object and a cold semi-object based on the frequency of access to the fields in the object as identified while the application runs in the virtual machine, wherein cache misses are reduced from splitting objects based of the frequency of access.

Abstract: Objects are managed in a virtual machine. A frequency of access to fields in objects for an application is identified while the application runs in the virtual machine. An object in the objects is split into a hot object and a cold semi-object based on the frequency of access to the fields in the object as identified while the application runs in the virtual machine, wherein cache misses are reduced from splitting objects based of the frequency of access.

Abstract: In one example in accordance with the present disclosure a printer cartridge is described. The printer cartridge includes multiple backpressure chambers in fluid communication with a shared free fluid chamber. The backpressure chambers are to supply a fluid to nozzles of a portion of a fluidic ejection assembly and to provide backpressure to the nozzles of the fluidic ejection assembly during deposition of fluid onto a print medium.

Abstract: Systems and methods are described for performing at least one of assessing, optimizing and/or controlling the performance of an Anaerobic Digestion (AD) plant. The system comprises a server that provides a user interface for allowing a user to enter user inputs to define various aspects of the AD plant operation and to view results of the simulation; a database for storing the inputs used for the simulation of the anaerobic digestion plant, the inputs including feedstock inputs, AD operational inputs, and simulation criteria; and a simulation engine that can be operated in an at least one of an off-line simulation mode for generating off-line simulator predictions, a near-line simulation mode for optimizing the performance of the system and an online mode for using machine learning to tune the performance of various models used in simulating the operation of the AD plant.

Abstract: In one example in accordance with the present disclosure a printer cartridge is described. The printer cartridge includes multiple backpressure chambers in fluid communication with a shared free fluid chamber. The backpressure chambers are to supply a fluid to nozzles of a portion of a fluidic ejection assembly and to provide backpressure to the nozzles of the fluidic ejection assembly during deposition of fluid onto a print medium.

Abstract: A tip to be placed on a fluid-ejection device is filled with fluid. The fluid may be introduced into a substantially hollow body of the tip at a first end of the body. The body of the tip has a second end at which a fluid-ejection mechanism is disposed to eject the fluid as controlled by the fluid-ejection device. The fluid may be introduced into the substantially hollow body of the tip through of the fluid-ejection mechanism disposed at the second end of the body of the tip. The tip may further be identified and/or serviced, and the tip and/or the fluid-ejection device may further be validated.

Abstract: A fluid-gas separator includes a gas-permeable membrane arranged sufficiently adjacent to a fluid-permeable membrane to allow the separation of fluid and gas flowing therein independent of the orientation of the fluid-gas separator itself.

Abstract: A peristaltic pump includes a plurality of occlusion surfaces and a plurality of rotors. The plurality of occlusion surfaces include a first occlusion surface and a second occlusion surface. The plurality of rotors includes a first rotor configured to be rotated about an axis and carrying a first set of occluding surfaces and a second rotor configured to be rotated about the axis and carrying a second set of occluding surfaces. The first set of occluding surfaces and the second set of occluding surfaces have a staggered pitch.

Abstract: A peristaltic pump includes opposing occlusion surfaces and a rotor between the occlusion surfaces. The rotor carries a set of occluding surfaces. At least one of either the set of occluding surfaces or the opposing occlusion surfaces are linearly movable relative to the other of the set of occluding surfaces and the occlusion surfaces.