Abstract: A method and device for modifying virtual content according to various simulation characteristics includes obtaining first virtual content; obtaining one or more simulation characteristics; and generating second virtual content by modifying the first virtual content according to the one or more simulation characteristics; and presenting the second virtual content.

Abstract: Various implementations disclosed herein include devices, systems, and methods for presenting content based on environmental data. In various implementations, a device includes a display, a non-transitory memory and one or more processors coupled with the display and the non-transitory memory. In some implementations, a method includes obtaining environmental data associated with a physical environment in which the device is located. In some implementations, the method includes selecting, from a plurality of presentation modes, a first presentation mode for content based on the environmental data. In some implementations, the method includes presenting the content in accordance with the first presentation mode.

Abstract: In one implementation, a method of displaying an animation is performed at a device including an optical see-through display, one or more processors, and a non-transitory memory. The method includes receiving a request to display a first animation of an object exhibiting a response characteristic. The method includes determining a metric characterizing an amount of processing power for the device to display the first animation on the optical see-through display. The method includes, in response to a determination that the metric exceeds a threshold associated with the device, selecting a second animation of the object exhibiting the response characteristic. The method includes displaying the second animation.

Abstract: In one embodiment, a peristaltic micropump comprising a substrate having a first side and a second side, a microtube that extends across the first side of the substrate, and multiple pump actuators formed on the first side of the substrate and positioned adjacent to the microtube at discrete, spaced positions along the length of the microtube, wherein the micropump is configured to sequentially actuate the pump actuators so as to create peristaltic action that drives fluid contained in the microtube along the length of the tube.

Abstract: Certain examples described herein provide a data processing system and method adapted for event processing. These examples provide for distribution of data processing operations between server computing devices. In one case, a plurality of processing stages are implemented using computing instances on the server computing devices. In this case, the computing instances are assigned to the server computing devices in order to perform at least one data processing operation in parallel. Certain examples described herein then provide for the distribution of data between computing instances such that parallelism is maintained for data processing operations. In certain cases, a composite key is used. In this case, a composite key value is computed for a set of data fields associated with a data item to be processed. This key value is computed based on a data processing operation to be performed.

Abstract: Certain examples described herein provide a data processing system and method adapted for event processing. These examples provide for distribution of data processing operations between server computing devices. In one case, a plurality of processing stages are implemented using computing instances on the server computing devices. In this case, the computing instances are assigned to the server computing devices in order to perform at least one data processing operation in parallel. Certain examples described herein then provide for the distribution of data between computing instances such that parallelism is maintained for data processing operations. In certain cases, a composite key is used. In this case, a composite key value is computed for a set of data fields associated with a data item to be processed. This key value is computed based on a data processing operation to be performed.

Abstract: Computers sending IP datagrams over an ATM network are generally capable of operating multiple simultaneous virtual circuits over the network. However, in doing so, they normally only set up one virtual circuit to each destination IP address so that in order to test the simultaneous operation of N virtual circuits by a computer under test, N target computers are needed. To enable a single computer (T) to provide the destination endpoints for multiple virtual circuits (SVC) from a computer (M) under test, both computers (M,T) are allocated a plurality of virtual IP addresses (IM(j),IT(i)) and the target computer (T) is additionally provided with a module running address-changing processes (70,71) that avoids the IP layers (20) of both computers from rejecting IP datagrams (25A,25B) addressed with the virtual IP addresses.

Abstract: The present invention provides a method for hosting a series of active connections between Internet Protocol end-points and a system which hosts at least two processes, each process of the system including a similar instruction set constituting a service application and each process having an IP address, wherein at least one process may adopt an active state where a plurality of connections are used for sending and receiving data while at least one other process may adopt a stand-by state where a plurality of connections are not used for sending and receiving data, the method including:

Abstract: Computers sending IP datagrams over an ATM network are generally capable of operating multiple simultaneous virtual circuits over the network. However, in doing so, they normally only set up one virtual circuit to each destination IP address so that in order to test the simultaneous operation of N virtual circuits by a computer under test, N target computers are needed. To enable a single computer to provide the destination endpoints for multiple virtual circuits from a computer under test, both computers are allocated a plurality of virtual IP addresses and the target computer is additionally provided with a module running address-changing processes that avoids the IP layers of both computers from rejecting IP datagrams addressed with the virtual IP addresses. As a result, each computer can be addressed with any of a plurality of IP addresses and each will result in the creation of a respective virtual circuit between the computers.

Abstract: The invention relates to the control of air flows for cooling the axial walls of a high-temperature combustion chamber in which the walls are provided with through holes forming multiple perforations, and involves arranging the multiple perforations so that the cooling airflow permeability of the walls in the downstream zone of the chamber decreases in the downstream direction in order to compensate for the effects of the increase in pressure drop due to variation of the gas flow velocity. The invention is particularly applicable to sharply convergent combustion chambers such as twin-head combustion chambers.

Abstract: The invention relates to a combustion chamber containing a number of aerohanical injectors mounted in the end of the chamber that connects the upstream end of two annular walls and which are supplied with fuel permanently during operation. The injectors are arranged in two concentric rows around the axis of symmetry and in pairs in longitudinal planes passing through the axis of symmetry. The injectors of the two rows are more or less equidistant from the outlet of the chamber and have axes directed toward the outlet. A carefully considered distribution of the primary holes, dilution holes and the air flow allows the emissions of oxides of nitrogen to be reduced.

Abstract: A computer system is provided with an operating system that has a streams mechanism for providing streams between user-space processes and drivers. This mechanism permits a user-space process to set up a multiplexer driver for multiplexing and demultiplexing streams. To facilitate the dynamic allocation of new streams to the multiplexer driver, a stream server is associated with the multiplexer driver, the stream server keeping a pool of available streams from which it satisfies any requests for more streams made by the multiplexer driver. The stream server can request a special user-space process to supply new streams to top up the pool.

Abstract: A system is disclosed for injecting air and fuel into a combustion chamber of a turbojet engine in which the system includes a fuel injector having an axis A, a first radial swirler located rearwardly of the fuel injector having a plurality of first air passages to direct air into the fuel emanating from the fuel injector in a first plane generally perpendicular to the axis A, a housing located rearwardly of the first radial swirler and forming a pre-mixing chamber bounded by a converging-diverging wall forming a venturi with a throat, the housing having a plurality of second air passages forming a second radial swirler to direct air into the pre-mixing chamber forwardly of the venturi throat in a second plane generally perpendicular to the axis A. The housing also has a plurality of third air passages forming an axial swirler, the second passages and the third passages alternating in a circumferential direction around the housing.

Abstract: A gas turbine engine combustion chamber bounded by inner and outer annular walls extending around a longitudinal axis of the engine and connected by an end wall, through which extend a plurality of fuel injectors, each with an intake air swirler. The outer annular wall has a plurality of first orifices arranged in a common plane and spaced apart in a circumferential direction such that each first orifice is circumferentially associated with a fuel injector and is located on one side of a radius line extending from the longitudinal axis and passing through the axis of the associated fuel injector, and a plurality of second orifices in the inner annular wall arranged in a common plane and spaced apart in a circumferential direction such that each second orifice is circumferentially associated with a fuel injector and is located on an opposite side of the radius line from the first orifice associated with the same fuel injector.

Abstract: A combustion chamber, particularly for a turbomachine, has at least one generally axially extending wall provided with a plurality of through holes defining a multi-hole cooling system for the wall. The wall also has a plurality of dilution holes which affect locally the flow of burnt gases in the chamber, and the cooling through holes are oriented according to the local flow of burnt gases in the chamber. In particular the wall is subdivided into first zones, downstream of the dilution holes, in which the through holes are oriented substantially in countercurrent to the overall flow direction of the burnt gases in the chamber, second zones and third zones which are disposed on opposite sides of the first zones and in which the orientation of the through holes is inclined both axially and circumferentially, and a fourth zone covering the remainder of the wall and in which the through holes are inclined axially in the overall flow direction of the burnt gases.

Abstract: A wall is disclosed for a gas turbine engine combustion chamber having a generally annular configuration around a central axis wherein the wall has an inner surface bounding at least a portion of the combustion chamber and a plurality of rows of cooling openings, each cooling opening having an elongated, generally rectangular configuration with a length l and a width e such that l is greater than e, the cooling openings in each row being equidistantly spaced apart a distance d in which d is not greater than the length l. The cooling openings of a given row are circumferentially displaced from cooling openings of an adjacent row and, since the distance d is not greater than the length l of the cooling openings, the opening areas overlap in adjacent rows to provide an even distribution of the cooling film within the combustion chamber.

Abstract: A fuel injection assembly for a combustion chamber of a gas turbine engine is disclosed in which a plurality of premixing chambers are in communication with the combustion chamber and adjacent pairs of the premixing chambers are connected to a single prevapoization chamber by prevaporization conduits. Fuel is injected into the prevaporization chamber via a fuel injector and is mixed with oxidizer passing into the prevaporization chamber such that the fuel/oxidizer mixture has a richness exceeding the stoichiometric ratio. The fuel/oxidizer mixture passes into the prevaporization conduits through a diaphragm opening and, upon entering the premixing chamber, is mixed with additional oxidizer such that the fuel/oxidizer mixture in each premixing chamber has a richness less than the stoichiometric ratio.

Abstract: An improved dual-head combustion chamber is disclosed having a generally annular configuration extending about a central axis with a low power head, operating during low power engine conditions and a radially displaced high power head operative under high power engine operating conditions. The low power head has N number of fuel/air injector assemblies arranged in an annular array and spaced apart in a circumferential direction about the central axis. The fuel/air injector assemblies of the low power head have an air permeability of P1. The high power head also is arranged in a generally annular array with N number of first fuel/air injector assemblies and N number of second fuel/air injector assemblies with each of the second fuel/air injector assemblies aligned with a fuel/air injector assembly of the low power head along a radius line extending from the central axis.