6338 results about "Thermal dilatation" patented technology

The invention provides an elongated lighting apparatus that can withstand temperature fluctuations. The elongated lighting apparatus comprises of the following elements: at least two elongated tubular members fabricated from translucent material. These elongated tubular members are fixed in an end-to-end configuration, separated by a region enabling for thermal expansion / contraction of the members. A substrate upon which a plurality of light emitting devices is placed, is slidably positioned inside each tubular member. End caps seal the open ends of the elongated tubular members. At least one of these end caps has a translucent protrusion that projects towards the region of separation. At least one light emitting device is positioned proximate to an end cap protrusion, thereby illuminating this region. A flexible interconnector encloses and visually conceals separating the adjacent members. The light emitting devices are electrically interconnected. An external power source provides a system to energize the light sources.

A method for making a multilayered electronic device with at least one epitaxial layer grown on a single-crystal film bonded to a composite wherein at least one layer is polycrystalline, the method includes the step of bonding a single-crystal film at least one of the epitaxial layers on the single-crystal film wherein thermal coefficients of expansion for the substrate and the epitaxial layer are closely matched.

Disclosed is an optical fiber cable that includes optical fibers and a deformable coupling element enclosed within a buffer tube. The coupling element is formed from a deformable yet substantially incompressible material that is capable of releasably and intermittently coupling the optical fibers to the buffer tube in various orientations. The design of the coupling element layer permits coupling of the optical fibers to the buffer tube without the use of a compressive cushioning layer and yet permits localized movement the optical fibers relative to the buffer tube to account for disparate thermal expansion and to accommodate optical fiber placement.

Disclosed is an optical fiber cable that includes optical fibers and a deformable coupling element enclosed within a buffer tube. The coupling element is formed from a deformable yet substantially incompressible material that is capable of releasably and intermittently coupling the optical fibers to the buffer tube in various orientations. The design of the coupling element layer permits coupling of the optical fibers to the buffer tube without the use of a compressive cushioning layer and yet permits localized movement the optical fibers relative to the buffer tube to account for disparate thermal expansion and to accommodate optical fiber placement.

A die cap for use with flip chip packages, flip chip packages using a die cap, and a method for manufacturing flip chip packages with a die cap are provided in the invention. A die cap encases the die of flip chip packages about its top and sides for constraining the thermal deformation of the die during temperature change. The CTE (coefficient of thermal expansion) mismatch between the die and substrate of flip chip packages is the root cause for warpage and reliability issues. The current inventive concept is to reduce the CTE mismatch by using a die cap to constrain the thermal deformation of the die. When a die cap with high CTE and high modulus is used, the die with the die cap has a relatively high overall CTE, reducing the CTE mismatch. As a result, the warpage and reliability of flip chip packages are improved.

A gas turbine engine has, in flow series, a compressor section, a combustor, and a turbine section. The gas turbine engine further has a system (i) for cooling the turbine section and (ii) for providing tip clearance control between turbine blades of the turbine section and a plurality of circumferentially distributed segments which form an annular shroud surrounding the outer tips of the turbine blades. The system includes a turbine section cooling sub-system which diverts a first cooling air flow received from the compressor section to a heat exchanger and then to the turbine section to cool components thereof. The first cooling air flow by-passes the combustor and is cooled in the heat exchanger. The turbine section cooling subsystem has a first valve arrangement which regulates the first cooling air flow. The system further includes a tip clearance control sub-system which supplies a second cooling air flow to an engine case to which the segments are mounted. The second cooling air flow regulates thermal expansion of the case and thereby controls the clearance between the segments and the outer tips. The tip clearance control sub-system has a second valve arrangement which regulates the second cooling air flow. The system further includes a closed-loop controller which issues first and second demand signals to respectively the first and the second valve arrangements. Each of the first and second demand signals are determined on the basis of: (i) a value of the first demand signal at a previous time step, and a measurement or estimate of turbine section component temperature, and (ii) a value of the second demand signal at a previous time step, and a measurement or estimate of tip clearance.

Methods are disclosed for a novel and useful single pass extrusion process for the reactive extrusion and compounding of polymers. Traditional extruders utilized in reactive processes are of length to diameter ratios ranging from 30 to 1 to as high as 56 to 1. The process disclosed uses a series of sequential, very closely-coupled, independently driven screw extruders having a total effective length to diameter ratio much greater than 70 to 1 and as high as 132 to 1 or greater, and providing greatly extended reaction times, separate and multiple introductions of reactive and non-reactive agents and mechanical connections allowing for convenient screw changes and differential thermal expansion. The assembly is employed to economically produce grafted polyolefins, produce ionomers without employing the use of strong caustic agents, remove large volumes of unwanted polymer processing solvents and produce other reacted polymer species in one continuous pass.

An acoustic sensor, such as a hydrophone, is deployable in a fluidic media having high temperature, high pressure, and / or potentially caustic chemicals. The hydrophone includes a housing filled with an internal fluid and containing a sensing mandrel. The sensing mandrel senses the acoustic pressure transmitted to the internal fluid through a diaphragm. The sensing mandrel preferably includes a polymer tubular mandrel having a coil of optical fiber wound and bonded to its outer surface. The sensing mandrel can be suspended within the housing instead of being rigidly attached thereto. To relieve pressure created by thermal expansion of the internal fluid, the flexible diaphragm, a filler member, a pressure compensator, or combinations thereof can be used. The filler member is mounted in the hydrophone and reduces the amount of internal fluid required in the housing. The compensator may be a bellows or a buffer tube.