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 94 for “"SINGLE ELEMENT"”.
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Design of a single element 3D ultrasound scanner
… and initial image reconstructions from a single element 3D ultrasound tomography system. The system enables volumetric pulse echo or transmission imaging of distal limbs, for applications including: improving prosthetic fittings, monitoring bone density, and characterizing muscle health. …
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Design and Development of Single Element Focused Ultrasound Transducers
… histotripsy transducers consist of multiple elements and are made using 3D printing methods. Multi-element transducers introduce size constraints and 3D printing has limitations in material choice, cost, and time for larger scale manufacturing. This thesis investigates the development of …
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Optimization of a micromechanical single element oscillator using nonlinear electrostatic cotnrol
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1998.
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Thermoacoustic Effects of a Variable Equivalence Ratio in a Single Element Methane Combustor
… of controlling the equivalence ratio of a single-element natural gas combustor were modeled and analyzed. The project used Fidelity Pointwise for meshing, ANSYS Fluent for modeling, ERAU VEGA HPC for computing, and MATLAB for acoustic analysis. A numerical model of the Purdue University …
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An Experimental Investigation of Self-Excited Combustion Dynamics in a Single Element Lean Direct Injection (LDI) Combustor
… based scaling of the current effort to multi-element combustors along with improvement in diagnostic techniques and analysis efforts are recommended for advancement in understanding of the complex physics in the multi-phase, three dimensional and turbulent combustion processes in the LDI …
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Size reduction of vivaldi antenna array for microwave imaging
… Vivaldi antenna array is designed, one antenna element is designed using FR-4 substrate which has relative permittivity of 4.3. and thickness of 1.6 mm. Furthermore, the single element is investigated to cover an ultra-wideband from 3.1 to 10.6 GHz by using Computer based Simulation Technology …
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The structure of 4-separations in 4-connected matroids
… ordered so that any consecutive collection of elements in this cyclic ordering is 4-separating. We prove that in this case either M is a matroid on at most seven elements or, up to duality, M is isomorphic to the polygon matroid of a cubic or quartic planar ladder, the polygon matroid of a …
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Damage location and estimation in large space structures
… an on-line format, and can asses damage in many elements. Theses are goals not realized by current methods. Damage incurred in a structural member is modeled as a linear reduction in that member's modulus of elasticity. The damaged structure's global stiffness matrix is expressed as the healthy …
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A millimeter-wave interferometric study of gas-phase silicon dicarbide in the circumstellar envelope surrounding IRC+10216
… the interferometer. The interferometry and 12-m single-element data were combined to make full synthesis maps of emission from SiC$\sb2$ toward IRC+10216.
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Characterisation of nitrogen stress response genes of the marine Alga Gracilaria Gracilis
… Saldanha Bay, South Africa and nitrogen is the single element of all the nutrients required by seaweeds that is most frequently limiting to growth. Biomass, relative growth rate, the concentration of nitrogen in the growth medium, the mean nitrogen uptake rate of the plant and the amount of …
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Computational Fluid Dynamics Analysis of Inverted, Multi-Element Airfoils in Ground Effect
… to maximize the negative lift. Five high lift, single element airfoils are firststudied at multiple angles of attack from which three superior airfoils are chosen and used in a follow-up study that performs flow simulations of these airfoils at various heights above the ground. A second study …
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Axle burn-off and stack-up force analyses of a railroad roller bearing using the finite element method
… and are composed of a two-row assembly with a single element containing the outer race for both rows of rollers (the cup) and separate elements for the inner races (the cones). From a reliability standpoint, the bearing-axle assembly may be the most critical component on a rail car. A bearing …
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Non-contact ultrasound
… ultrasound utilizes traditional piezoelectric elements in a tomographic framework to develop new algorithms and acquisition methods for quantification of tissue geometry and properties in human proximal limbs. Bone is uniquely challenging for ultrasound due to the high impedance mismatch …
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Embedded Power Active Contact Lens
… the battery and drive the display. A printed single element display using electrochromic ink was chosen as it is able to indicate the user when activated while staying transparent. Lastly, this thesis analyzes the material properties of the chosen substrate for it clearness, flexibility, and …
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Low cost housing : an evaluation of its adequacy in relation to the Coloured group in Cape Town
"No single element in urban planning outweighs in importance that of housing for the well being of the individual, the family and the community. Yet few questions in urban planning are as little understood, as subject to varying standards and as open to emotionally charged argument as that of what …
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Rotating Disk Electrode Design for Concentration Measurements in Flowing Molten Chloride Salts
… understood in static cases when there is only a single element to consider. When additional elements are added, or the system is flowing rather than static, things get slightly more complicated but are still decently well understood. However, in the case of spent fuel reprocessing the system is …
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A Response Surface Exit Crown Model Built from the Finite Element Analysis of a Hot-Rolling Mill
… industry standard strip height measurements. The single element response surface in use provides the advantages of continuous derivatives and decouples rolling load from the determination of exit height. The data points to build the response surface are the product of a calibrated finite element …
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Trailing Edge Flow Conditions as a Factor in Airfoil Design
Some new developments relevant to the design of single-element airfoils using potential flow methods are presented. In particular, the role played by the non-dimensional trailing edge velocity in design is considered and the relationship between the specified value and the resulting airfoil …
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Parametric Design, Modeling, and Optical Evaluation of Retroreflective Prismatic Structures
… to model the novel RTP geometry. Those elements are then tested by optical simulation software in single element and areal forms and their performances are compared. Moreover, fabricated prototype arrays of RTPs were separately tested using a digital lux meter and a luminance imaging …
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A Design Flow for Additively Manufactured 3D Metasurface Antennas
… of hundreds or thousands of individual elements that each exert their own influence on the performance of the antenna. Due to this, the process of designing and developing a MTS antenna can be intensive in terms of both the time to understand the how these antennas operate and time …
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