Abstract: A printing fluid pen includes a plurality of fluid ports, a pressure regulator in fluid communication with a first fluid port, and a valve in fluid communication with a second fluid port. The first fluid port is to deliver printing fluid to a fluid ejection device, and the second fluid port is to direct printing fluid out of the pen. In response to negative pressure, the valve is to open to enable fluids within the pen to exit via the second port.

Abstract: Examples include an end cap system for a developer unit in a liquid photographic printer. The end cap system includes an end cap and a film that includes a first outermost superficial layer and a second outermost superficial layer opposed to the first outermost superficial layer. The first outermost superficial layer is a pressure sensitive adhesive layer applied to a portion of an inner surface of the end cap. The second outermost superficial layer is a low surface energy layer to be exposed to liquid photographic printing fluid during printing.

Abstract: An example printing fluid pen comprises a plurality of fluid ports, a pressure regulator in fluid communication with a first fluid port, and a valve in fluid communication with a second fluid port. The first fluid port is to deliver printing fluid to a fluid ejection device, and the second fluid port to direct printing fluid out of the pen. In response to negative pressure, the valve is to open to enable fluids within the pen to exit via the second port.

Abstract: A roller charging device may include a Y-shaped electrically conductive brush and a screw terminal coupling the Y-shaped electrically conductive brush to a housing of the roller charging device and electrically coupling the Y-shaped electrically conductive brush to a power source. A printing fluid developer may include a plurality of rollers and a plurality of Y-shaped brushes to each contact one of the plurality of rollers wherein each of the Y-shaped brushes provides an electrical charge to each of the plurality of rollers.

Abstract: In an example of a textile printing method, a thermally curable ink composition is applied on a fabric substrate. The thermally curable ink composition includes from about 1 wt % active to about 6 wt % active of a pigment that absorbs ultraviolet radiation, infrared radiation, or a combination thereof, based on a total weight of the thermally curable ink composition; from about 2 wt % active to about 20 wt % active of a polymeric binder, based on the total weight of the thermally curable ink composition; and an aqueous ink vehicle. In the method, the pigment of the thermally curable ink composition is selectively heated on the fabric substrate by exposing the fabric substrate to an emission wavelength from a narrow wavelength light source for a total exposure time of 3 seconds or less. The selective heating thermally fixes the pigment to the fabric substrate.

Abstract: A method of internal recirculation printing can include introducing an ink composition into a firing chamber, the ink composition comprising water, organic co-solvent, pigment, and from 2 wt % to 20 wt % of a dispersed polymer binder with an acid number from 0 mg KOH/g to 45 mg KOH/g, a weight average molecular weight of 40,000 Mw to 2,000,000 Mw, and a particle size from 40 nm to 2 ?m. The method can further include internally recirculating ink composition from the firing chamber, through micro-recirculation fluidics, and back into the firing chamber to be again recirculated or ejected from the firing chamber, as well as ejecting ink composition from the firing chamber through a jetting nozzle onto a substrate.

Abstract: A technique includes rotating a squeegee roller to regulate a film thickness of ink on a developer roller; and using the developer roller to transfer a portion of the ink from the developer roller to a photoconductive member. The technique includes creating, by an electrode, a potential bias with the developer roller to transfer the ink to the developer roller; and inhibiting flow streaks on the developer roller, where inhibiting the flow streaks includes restricting a flow of ink between the squeegee roller and the electrode.

Abstract: A roller charging device may include a Y-shaped electrically conductive brush and a screw terminal coupling the Y-shaped electrically conductive brush to a housing of the roller charging device and electrically coupling the Y-shaped electrically conductive brush to a power source. A printing fluid developer may include a plurality of rollers and a plurality of Y-shaped brushes to each contact one of the plurality of rollers wherein each of the Y-shaped brushes provides an electrical charge to each of the plurality of rollers.

Abstract: A technique includes rotating a squeegee roller to regulate a film thickness of ink on a developer roller; and using the developer roller to transfer a portion of the ink from the developer roller to a photoconductive member. The technique includes creating, by an electrode, a potential bias with the developer roller to transfer the ink to the developer roller; and inhibiting flow streaks on the developer roller, where inhibiting the flow streaks includes restricting a flow of ink between the squeegee roller and the electrode.

Abstract: A transmission for a developer unit that includes a developer roller to apply LEP ink to a photoconductor, a cleaner roller to clean the developer roller, and a squeegee roller to squeegee ink on the developer roller. In one example, the transmission includes a mechanical drive train to, with the cleaner roller, simultaneously drive the developer roller at a first surface speed and the squeegee roller at a second surface speed slower than the first surface speed.

Abstract: A transmission for a developer unit that includes a developer roller to apply LEP ink to a photoconductor, a cleaner roller to clean the developer roller, and a squeegee roller to squeegee ink on the developer roller. In one example, the transmission includes a mechanical drive train to, with the cleaner roller, simultaneously drive the developer roller at a first surface speed and the squeegee roller at a second surface speed slower than the first surface speed.

Abstract: In an example, a torque key may include a body to mate with a wheel, a plurality of driving lugs extending radially outward from the body, and a plurality of key lugs extending radially into the body. The body may have an inner bore to receive a shaft, each driving lug may engage with a driven lug protruding from an axial face of the wheel, and each key lug may engage with a slot of the shaft.

Abstract: A gas turbine includes a compressor and at least one combustor downstream from the compressor. The combustor includes a burner having an inner shroud extending axially along at least a portion of the burner, an outer shroud radially separated from the inner shroud and extending axially along at least a portion of the burner, and a plurality of stator vanes extending radially between the inner shroud and the outer shroud. The stator vanes have an inner end proximate the inner shroud and an outer end proximate the outer shroud. The burner further includes a vortex tip at one of either the inner end or the outer end of the stator vanes. The vortex tip provides a gap between the inner end and the inner shroud or the outer end and the outer shroud, and the vortex tip includes a plurality of fuel ports. The gas turbine further includes a turbine downstream from the combustor.

Abstract: A system includes at least one gas turbine blade that includes at least one recess disposed in a surface of the at least one gas turbine blade. The system also includes a porous insert that includes multiple pores that enable a cooling fluid to flow through the porous insert. The system further includes a cover plate, wherein the porous insert is disposed within the at least one recess, and the cover plate is disposed over the porous insert to enclose the porous insert within the at least one recess.

Abstract: Pre-treatment composition and printing method, for producing durable images, using it are disclosed. Said pre-treatment composition includes a liquid vehicle, a polyvalent metal salt as fixing agent, and a latex resin having a glass transition temperature (Tg) ranging from ?22° C. to 20° C. Said method encompasses applying the pre-treatment composition onto a recording medium and applying an ink composition including an aqueous liquid vehicle and a colorant, over said pre-treatment composition, wherein the time interval between the finishing point of the application of the pre-treatment composition and between the starting point of the application of the ink composition is between 1 and 30 seconds.

Abstract: A gas turbine includes a compressor and at least one combustor downstream from the compressor. The combustor includes a burner having an inner shroud extending axially along at least a portion of the burner, an outer shroud radially separated from the inner shroud and extending axially along at least a portion of the burner, and a plurality of stator vanes extending radially between the inner shroud and the outer shroud. The stator vanes have an inner end proximate the inner shroud and an outer end proximate the outer shroud. The burner further includes a vortex tip at one of either the inner end or the outer end of the stator vanes. The vortex tip provides a gap between the inner end and the inner shroud or the outer end and the outer shroud, and the vortex tip includes a plurality of fuel ports. The gas turbine further includes a turbine downstream from the combustor.

Abstract: A method of fabricating a component is provided. The component includes a substrate having an outer surface and an inner surface, where the inner surface defines at least one interior space. The fabrication method includes forming at least one groove in the outer substrate surface. Each groove extends at least partially along the outer substrate surface and has an asymmetric cross-section. The method further includes forming at least one access hole in the substrate. Each access hole connects the respective groove in fluid communication with the respective interior space. A coating is disposed over at least a portion of the substrate surface, such that the groove(s) and the coating together define one or more channels for cooling the component. A component is also disclose and has at least one groove with an asymmetric cross-section.

Abstract: A system includes at least one gas turbine blade that includes at least one recess disposed in a surface of the at least one gas turbine blade. The system also includes a porous insert that includes multiple pores that enable a cooling fluid to flow through the porous insert. The system further includes a cover plate, wherein the porous insert is disposed within the at least one recess, and the cover plate is disposed over the porous insert to enclose the porous insert within the at least one recess.

Abstract: A turbine blade includes an outer surface, and a rim surrounds at least a portion of the outer surface. A trench in the rim extends around at least a portion of the outer surface.

Abstract: A printing system and method form one or more pretreatment compositions on a medium. The one or more pretreatment compositions are selected based upon a parameter of the medium.