Abstract: An airfoil stage of a turbine engine includes an upstream airfoil assembly, a downstream airfoil assembly in rotational relationship to the upstream airfoil assembly and a rim seal assembly integrated therebetween. The rim seal assembly may include a sloped downstream portion of a platform of the upstream airfoil assembly, an upstream segment of a platform of the downstream airfoil assembly and a nub that projects radially outward from the upstream segment. The downstream portion and the upstream segment are spaced from one-another defining a cooling cavity therebetween for the flow of cooling air. The portion and segment overlap axially such that the nub is axially aligned to the downstream portion for improved cooling effectiveness and a reduction of core airflow into the cooling cavity.

Abstract: A method of providing a chemically inert concrete includes the steps of providing and mixing an aqueous colloidal silica dispersion with a quantity of glass particles. The chemically inert concrete includes, based on dry weight, about 50% to about 95% by weight of the glass particles and about 3% to about 40% by weight of the colloidal silica particles. The chemically inert concrete is substantially or totally free of Group I and Group II metal oxides, exclusive of the glass particles, and is substantially or totally free of cement.

Abstract: An exemplary method for qualifying a gas turbine engine component includes creating a first set of substantially identical gas turbine engine components via a uniform manufacturing procedure, determining a set of as-manufactured parameters of each gas turbine engine component in the first set of substantially identical gas turbine engine components, determining a variance model of the first set of substantially identical gas turbine engine components, and determining a plurality of predicted response models based at least in part on the variance model, each of the predicted response models corresponding to one of an engine type and an engine assembly, and each of the predicted response models being configured to determine a predicted response of including a gas turbine engine component from the first set of substantially identical gas turbine engine components in the corresponding one of the engine type and the engine assembly.

Abstract: A method for qualifying a gas turbine engine component includes creating a first set of substantially identical gas turbine engine components via a uniform manufacturing procedure, determining a set of as-manufactured parameters of each gas turbine engine component in the first set, and determining a variance model of the first set. The variance model includes a representative parameter profile, which includes a plurality of component parameter profiles. The sum of each of the component parameter profiles is the representative parameter profile.

Abstract: A qualification system for gas turbine engine components includes a computer system configured to receive a set of measured parameters for each gas turbine engine component in a plurality of substantially identical gas turbine engine components, and determine a variation model based on the set of measured parameters. The computer system includes at least one simulated engine model configured to determine a predicted operation of each gas turbine engine component in the plurality of substantially identical gas turbine engine components, a correlation system configured to correlate variations in the set of parameters for each of the gas turbine engine components with a set of the predicted operations of each gas turbine engine, thereby generating a predictive model based on the variations. The computer system also includes a qualification module configured to generate a qualification formula based on the predictive model.

Abstract: A method of making a refractory article having excellent high-temperature thermal shock resistance and creep resistance is provided. The method includes the step of providing a refractory composition primarily composed of chamotte having controlled particle sizes. The refractory composition may also include mullite, fused silica, calcined alumina and microsilica having controlled particle sizes, and further includes an aqueous colloidal silica binder. The refractory composition is then formed into a refractory article, which is dried and hardened.

Abstract: A resin container is configured to provide a photocurable resin to a three dimensional printing system. The three dimensional printing system includes a receptacle configured to provide the resin to a print engine. The resin container includes a housing enclosing an internal reservoir which contains an impeller. The resin container has a leading end and a trailing end relative to a direction of insertion or installation of the resin container into the receptacle. The leading end includes a fluid outlet extending downwardly from a first lateral location, an electrical connector extending downwardly from a second location, and a gear coupled to the impeller and extending downwardly from a third lateral location.

Abstract: A kit enables an efficient and contamination-free method of changing a resin used in a three dimensional printer from a first resin to a second resin. The three dimensional printer includes a print engine and a receptacle. The kit includes a conduit assembly and a resin container. The conduit assembly includes a fluid inlet configured to be affixed in the receptacle in an upward orientation, a pump head configured to be coupled to a motorized pump actuator in the receptacle, a first conduit coupling the fluid inlet to the pump head, a fluid outlet configured to supply resin to the print engine, and a second conduit coupling the pump head to the fluid outlet.

Abstract: A three dimensional printing system for manufacturing a three dimensional article includes a print engine, a receptacle, a pump motor system, a removable conduit assembly, and a resin container. The receptacle includes an upper portion with an opening and a lower interface portion. The removable conduit assembly includes: a fluid inlet extending upwardly from the lower interface portion; a pump head removably coupled to the pump motor system; a fluid outlet for supplying resin to the print engine. The resin container includes an internal reservoir and a leading and trailing end relative to a direction of insertion of the resin container into the receptacle. The resin container includes a fluid outlet that extends downwardly from the leading end. Installation of the resin container includes passing the leading end through the opening and lowering and coupling the leading end to the lower interface portion.

Abstract: A refractory kiln car formed using a refractory composition has excellent resistance to high-temperature thermal shock and creep. The refractory composition is based primarily on chamotte having controlled particle sizes, and may also include mullite, fused silica, calcined alumina and microsilica, having controlled particle sizes. The refractory composition includes an aqueous colloidal silica binder that provides excellent castability and binding between the ingredients following drying.

Abstract: A segmented sideplate for use in a gas turbine engine is described. The segmented sideplate includes a first plate having a first circumferential edge configured to interface with a complementary circumferential edge. The segmented sideplate also includes a second plate having a second circumferential edge configured to interface with the first circumferential edge.

Abstract: A method and apparatus for improving the reliability of a digital communications system is provided. In accordance with at least one embodiment, power of a transmitted signal is controlled to improve reliability. In accordance with at least one embodiment, timing of a transmitted signal is controlled to improve reliability. In accordance with at least one embodiment, interference is detected. In accordance with at least one embodiment, interference is localized. In accordance with at least one embodiment, combinatorial processing is used to increase reliability. In accordance with at least one embodiment, gradual rekeying is performed. In accordance with at least one embodiment, confirmed stepwise progression rekeying is performed. In accordance with at least one embodiment, transmission detection is provided. In accordance with at least one embodiment, reporting of cryptographic mode utilization is provided.

Abstract: A fluid delivery apparatus for a printing system includes a fluid outlet defining an upper fluid flow path. The fluid outlet includes an upper portion, a lower portion, a lateral surface, and an electronic device. The upper and lower portions of the fluid outlet each surround the upper fluid flow path. The lateral surface is between the upper and lower portions. The electronic device is disposed upon the lateral surface and includes a substrate, an information storage device, and a plurality of electrical contact pads. The information storage device stores information pertaining to the fluid delivery apparatus. The plurality of electrical contact pads are disposed upon the substrate and face downwardly to receive upwardly extending pressure contacts.

Abstract: A flowpath component for a gas turbine engine includes a first platform including a vascular engineered lattice structure, a body extending from, and supported by the first platform. The body is configured to at least partially span a flowpath in an installed position and the vascular engineered lattice structure including at least one purge air inlet, and at least one spent air outlet.

Abstract: Additional document information may be stored through change tracking. In some examples, an application, such as a document processing application, may allow collaborative creation and/or editing of a document. As individual collaborators enter new content or make changes to existing content, the new content and/or changes go through two phases. As an individual collaborator is editing, the change is temporary. The collaborator may decide not to integrate it to the document. The temporary content may become permanent or integrated through a save action (manual or automatic). In some examples, the temporary content may be shared with other collaborators through a scheme to indicate its status as temporary giving the collaborators a true collaboration experience.

Abstract: An example turbine includes a turbine disk and a turbine blade. The turbine disk includes a plurality of lugs and a plurality of slots. Each of the plurality of lugs is located between two of the plurality of slots. Each of the plurality of lugs includes a tab that extends radially outwardly from an end of the lug. The tab has a first section having an upper surface and a second section having an upper surface. The upper surface of the first section is inclined greater than the upper surface of the second section, and the upper surface of the first section of the tab defines a contour. The turbine blade includes a root received in one of the plurality of slots and a platform, and the platform has a lower surface defining a contour.

Abstract: A method and apparatus for improving the reliability of a digital communications system is provided. In accordance with at least one embodiment, power of a transmitted signal is controlled to improve reliability. In accordance with at least one embodiment, timing of a transmitted signal is controlled to improve reliability. In accordance with at least one embodiment, interference is detected. In accordance with at least one embodiment, interference is localized. In accordance with at least one embodiment, combinatorial processing is used to increase reliability. In accordance with at least one embodiment, gradual rekeying is performed. In accordance with at least one embodiment, confirmed stepwise progression rekeying is performed. In accordance with at least one embodiment, transmission detection is provided. In accordance with at least one embodiment, reporting of cryptographic mode utilization is provided.

Abstract: A component according to an exemplary aspect of the present disclosure includes, among other things, a wall and a hollow vascular engineered lattice structure formed inside of the wall. The hollow vascular engineered lattice structure has an inlet hole and an outlet hole that communicate fluid into and out of the hollow vascular structure. The hollow vascular engineered lattice structure further has at least one resupply inlet hole between the inlet hole and the outlet hole with respect to a dimension of the component to communicate additional fluid into the hollow vascular engineered lattice structure.

Abstract: A damper seal received in a cavity of a turbine blade located between a platform and a retention shelf damper seal according to an exemplary aspect of the present disclosure includes, among other things, a central body portion having a first end region, an opposing second end region, and a width. The damper seal further includes a first portion extending from the first end region of the central body portion, and a first end region of the first portion includes first outwardly extending tabs that define a first enlarged portion that has a first width greater than the width of the central body portion and a second portion extending from the opposing second end region of the central body portion.

Abstract: A refractory kiln car formed using a refractory composition has excellent resistance to high-temperature thermal shock and creep. The refractory composition is based primarily on chamotte having controlled particle sizes, and may also include mullite, fused silica, calcined alumina and microsilica, having controlled particle sizes. The refractory composition includes an aqueous colloidal silica binder that provides excellent castability and binding between the ingredients following drying.