Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 32 for “"rectangular cross-section"”.
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Superconducting joints with rectangular cross section niobium-tin multifilamentary superconductor
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1991.
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Pulsed field of a magnetising coil wound with a solid conductor of rectangular cross-section
… assumed to be made from a copper conductor with rectangular cross-sectional area. The algorithm accounts for each turns physical dimensions and spatial coordinates with respect to other turns, by simulating each winding with a model helical turn. A boundary matching method is used to determine …
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Capillarity in lithographically patterned micro channels
… the theory for capillary rise in channels of rectangular cross-section has been tested and verified, taking into account the effects of surface topography assuming a Wenzel state. The theory has been tested via capillary rise experiments using polydimethylsiloxane oils of viscosity 96.0, 48.0, …
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Kippe em hastes retas em regime elasto-plástico
… have been restricted to steel beams with rectangular cross-section.
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Stiffness Model of a Die Spring
… the three-dimensional stiffness matrix of a rectangular cross-section helical coil compression spring. The stiffnesses of the spring are derived using strain energy methods and Castigliano's second theorem. A theoretical model is developed and presented in order to describe the various steps …
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Isothermal helium flow measurements twrough a rectangular channel for a Wide Knudsen range
… the isothermal steady flow of Helium through a rectangular microchannel from the continuum to the free-molecular regime. The intention is to expand the measured Knudsen number range for rectangular cross section microchannels as compared with that presently found in in the literature. As …
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The Pseudo-Rigid-Body Model for Dynamic Predictions of Macro and Micro Compliant Mechanisms
… to the transient behavior of a typical uniform rectangular cross section beam. The results of this study are extended and applied to compliant planar mechanisms. It is shown by comparison with finite element analysis and experimental results that the PRBM is a good model of the physical system's …
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Stress changes in reinforced concrete members due to creep
… and concrete in reinforced concrete beams of rectangular cross-section due to creep relaxation. The data has been tabulated and graphed. Extensive use of the digital computer has been made to thoroughly investigate these stress changes within a wide range of parameters including these stress …
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Analysis of the Suspended H-Waveguide and Other Related Dielectric Waveguide Structures
… to other planar dielectric structures of rectangular cross section. However, for applications where only approximate values of the propagation constants are necessary, a simple effective parameter approximations are employed. Even though the effective parameter approximations do not …
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Shape memory alloy rotary actuator for CubeSat deployable structures
… shape memory alloy geometries are explored: a rectangular cross-section and a circular cross-section. The rectangular hinge actuates over a range of ±20° with an average power of 0.14 W. The circular hinge actuates over a range of ±23° with an average power of 0.073 W. A closed-loop controller …
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Ensaios de pórticos planos de concreto armado com pilares esbeltos
… formed by two columns and one beam with constant rectangular cross-section. Load was applied on one of the columns with an eccentricity of three centimeters with respect to its axis. In these frames the length of the columns and the height of the beams were varied. Graphs were done relating the …
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Análise não-linear de pórticos planos de concreto armado
… and alternatively members with circular and rectangular cross-section in the same structure are allowed. In addition, for each member it is possible to perform a subdivision into segments of constant characteristics, and also to allow for discontinuities at the ends. The computer program can …
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Tailoring the Geometry of Micron Scale Resonators to Overcome Viscous Damping
… simulations. We consider beams with uniform rectangular cross-section and explore the increased quality factor and resonant frequency as a baseline geometry is varied by increasing the width, increasing the thickness, and decreasing the length. The quality factor is nearly doubled by tripling …
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ΕΞΟΜΟΙΩΣΗ ΡΟΙΚΟΥ ΠΕΔΙΟΥ ΑΞΟΝΟΣΥΜΜΕΤΡΙΚΩΝ ΣΩΜΑΤΩΝ ΣΕ ΘΑΛΑΜΟ ΜΕΤΡΗΣΕΩΝ ΑΕΡΟΣΗΡΑΓΓΑΣ
… AROUND AXISYMMETRIC BODYWITHIN A WORKING SECTION OF A RECTANGULAR CROSS SECTION AND TO THE SIMULATION OF THE UNCONFINED FLOW PATTERN APPLYING THE CONTOURED WALL TECHNIQUE FOR THE MINIMIZATION OF THE WALL INTERFERENCE. THE CONFINED AND POTENTIAL FLOWFIELD ANALYSIS IS BASED ON THE LINEARISED …
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Alendronate treatment elicits a reduction in fatigue-life of canine cortical bone
… cortices, 1-6 cortical bone beams of uniform rectangular cross-section (0.5 x 1.5 mm) and length (10 - 12 mm) were prepared. A total of 90 bone beams were mechanically loaded in 4-point bending at specific stress amplitudes, 45- 85 MPa, applied sinusoidally at 2 Hz until fracture or 250,000 …
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Discovering the Complex Aerodynamics of Flapping Flight with Bio-kinematics Using Boltzmann and Eulerian Methods
The cross-sectional geometry of an insect wing has historically been simplified to a rectangular, elliptic, or having a streamlined airfoil shape. Up until this point, no analysis has utilized a morphologically accurate insect wing. As such, there remains significant questions as to whether or not …
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Understanding the friction between human fingers and contacting surfaces
… area of contact, the effect of triangular and rectangular cross-section ridges and the effect of moisture. The tests found that when a finger is contacting a nominally flat surface, the friction force increases with normal force, following a two part linear relationship. This is associated with …
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Design and optimization of micropumps using electrorheological and magnetorheological fluids
… and Bingham flow in a curved channel with a rectangular cross section have been used to model the MR fluid flow exposed to certain magnetic field intensity. Static and dynamic magnetic sealing performance is investigated theoretically and experimentally, which is evaluated by Mason numbers …
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Finite element formulation of a thin-walled beam with improved response to warping restraint
… These effects are quite significant for closed sections. The element is validated for several cases of a cantilevered beam of rectangular cross section and in every case the results are in good agreement with the exact solution. It is also shown that the element gives a very good representation …
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