25,325 research outputs found

    Installing fiber insulation

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    A method for installing fragile, high temperature insulation batting in an elongated cavity or in a resilient wire sleeve to form a resilient seal. The batting is preformed to rough dimensions and wrapped in a plastic film, the film being of a material which is fugitive at a high temperature. The film is heat sealed and trimmed to form a snugly fit skin which overlaps at least at one end to permit attachment of a pull cord. The film absorbs the tensile force of pulling the film enclosed batting through the cavity or wire mesh sleeve and is subsequently driven off by high temperature baking, leaving only the insulation in the cavity or wire mesh sleeve

    Assembly for recovering a capsule Patent

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    Assembly for opening flight capsule stabilizing and decelerating flaps with reference to capsule recover

    Space capsule ejection assembly Patent

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    Describing assembly for opening stabilizing and decelerating flaps of flight capsules used in space researc

    Controlling the accuracy of unconditionally stable algorithms in Cahn-Hilliard Equation

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    Given an unconditionally stable algorithm for solving the Cahn-Hilliard equation, we present a general calculation for an analytic time step \d \tau in terms of an algorithmic time step \dt. By studying the accumulative multi-step error in Fourier space and controlling the error with arbitrary accuracy, we determine an improved driving scheme \dt=At^{2/3} and confirm the numerical results observed in a previous study \cite{Cheng1}.Comment: 4 pages, late

    Ray optical light trapping in silicon microwires: exceeding the 2n^2 intensity limit

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    We develop a ray optics model of a silicon wire array geometry in an attempt to understand the very strong absorption previously observed experimentally in these arrays. Our model successfully reproduces the n^2 ergodic limit for wire arrays in free space. Applying this model to a wire array on a Lambertian back reflector, we find an asymptotic increase in light trapping for low filling fractions. In this case, the Lambertian back reflector is acting as a wide acceptance angle concentrator, allowing the array to exceed the ergodic limit in the ray optics regime. While this leads to increased power per volume of silicon, it gives reduced power per unit area of wire array, owing to reduced silicon volume at low filling fractions. Upon comparison with silicon microwire experimental data, our ray optics model gives reasonable agreement with large wire arrays (4 μm radius), but poor agreement with small wire arrays (1 μm radius). This suggests that the very strong absorption observed in small wire arrays, which is not observed in large wire arrays, may be significantly due to wave optical effects

    A simulation model for wind energy storage systems. Volume 2: Operation manual

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    A comprehensive computer program (SIMWEST) developed for the modeling of wind energy/storage systems utilizing any combination of five types of storage (pumped hydro, battery, thermal, flywheel, and pneumatic) is described. Features of the program include: a precompiler which generates computer models (in FORTRAN) of complex wind source/storage/application systems, from user specifications using the respective library components; a program which provides the techno-economic system analysis with the respective I/O the integration of system dynamics, and the iteration for conveyance of variables; and capability to evaluate economic feasibility as well as general performance of wind energy systems. The SIMWEST operation manual is presented and the usage of the SIMWEST program and the design of the library components are described. A number of example simulations intended to familiarize the user with the program's operation is given along with a listing of each SIMWEST library subroutine

    Power struggles and playing politics: an application of Bourdieu's cultural intermediation theory to place marketing

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    Place branding strategies contribute to policy decisions that shape a city. Little research, however, investigates how place marketers influence the decision-making of those higher up in the value chain. Drawing upon Bourdieu's theory of cultural intermediation, we identify where these professionals exhibit influence in a city branding endeavour and what impact they have on policy decisions. We report results of semi-structured interviews with senior place marketers at 13 cities around the world and find that policy decisions are influenced in unofficial, hidden and non-systemic ways, including identifying and working with key stakeholders behind the scenes, playing politics, and applying a promotional lens to policy endeavours. We discuss these findings and their implications on theory and practice
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