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 12 of 12 for “"Harmonic motion"”.
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Biomechanical Assessment and Monitoring of Thermal Ablation Using Harmonic Motion Imaging for Focused Ultrasound (HMIFU)
… healthy tissues remain relatively untreated. Harmonic Motion Imaging for Focused Ultrasound (HMIFU) is a dynamic, radiation-force-based imaging technique, which utilizes a single HIFU transducer by emitting an Amplitude-modulated (AM) beam to both thermally ablate the tumor while inducing a …
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ΑΝΑΓΝΩΡΙΣΗ ΙΔΙΟΜΟΡΦΩΝ ΤΑΛΑΝΤΟΥΜΕΝΩΝ ΠΛΑΚΩΝ ΑΠΟ ΘΕΡΜΟΚΡΑΣΙΑΚΕΣ ΜΕΤΡΗΣΕΙΣ
… RESULTSIN A TEMPERATURE INCREASE. GIVEN THE HARMONIC MOTION OF THE BOUNDARY, THE STEADY VIBRATION OF PLATES AND THE DAMPING HEAT, GENERATED IS COMPUTED. THEN THE HEAT CONDUCTION EQUATION YIELDS THE TEMPERATURE DISTRIBUTION. THE INVERSE PROBLEM, TO FIND THE PLATE VIBRATION FROM THE TEMPERATURE …
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The Dynamic characterisation of ESR prosthetic running feet: an investigation of the key parameters affecting their performance.
… be considered to act in accordance with Simple Harmonic Motion, but this does not appear to be reflected by the prescription processes currently employed by manufacturers. The research question is asked: ‘Is the current method of prescribing prosthetic ESR running feet appropriate and are there …
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Analysis of Buckled and Pre-bent Columns Used as Vibration Isolators
… The columns will be subjected to simple harmonic motion applied at the base or to a multi-frequency base excitation. The response of each model is measured by the deflection transmissibility of the supported load over a large range of frequencies. Effective models reduce the motion of the …
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What Pain Calls to Witness for Mezzo-soprano, Clarinet, Piano, and Fixed Media
… to exercise patience and enter a complex emotional space. Like music, physical pain is a sensory experience often captured with abstract language; but the two can inform each other. The fixed media component of this work is comprised of predominantly vocal samples, joined in a “pain …
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Coherent manipulations of trapped 88Sr+ using the 4D5/2 --> 5S1/2 transition
… both the internal electronic state and quantum harmonic motion of a trapped 88Sr+ ion via its 4D5/2 <--> 5S1/2 transition. The laser is locked with a linewidth on the order of 1Hz to the resonance of a high-finesse optical cavity. However, acoustic and thermal noise in the cavity broadens the …
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Unsteady aerodynamics for aeroelastic applications using the impulse response method
… identifies the response of a 2-D wing section to harmonic pitch and plunge oscillations. Recently, however, the Aerodynamic Impulse Response has emerged, identifying a more fundamental aerodynamic response of a discrete-time system as that to a unit impulse. With this response, the response to any …
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Ros-Drill Automation: Visual Feedback Control And Rotational Motion Tracking
… we improve the performance of the rotational motion tracking.</p> <p>Ros-Drill<sup>©</sup> is an inexpensive set-up, which creates high-frequency rotational oscillations at the tip of an injection pipette tracking a harmonic motion profile. These rotational oscillations enable the pipette to …
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Electromagnetic stirring using a travelling magnetic field
… field to give a Lorentz force which drives fluid motion. When the magnetic Reynolds number is large the imposed magnetic field is changed significantly. In this study we consider uniformly-moving and accelerating fields. For the initial fluid motion due to a two Fourier-component source moving at …
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Aero-servo-viscoelasticity theory: lifting surfaces, plates, velocity transients, flutter, and instability
… that flutter is the first occurrence of simple harmonic motion of a structure, and the flight velocity at which this motion occurs is taken as the flutter speed. The expanded definition indicates that the flutter condition should be taken when simple harmonic motion occurs and certain additional …
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Aeroservoelastisches Modell zur Beschreibung der instationären Aerodynamik für nichtlineare beliebige Eingangsgrößen im Zeitbereich
… flow are set up.6. The differential equations of motion of the airfoil-rudder-system are expressed by the LAGRANGE equations of second kind and combined with the aerodynamic equations to the aeroelastic system.7. The validation of the aeroelastic is carried out by comparison of the flutter speed …
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Calibration of an arch dam model by the finite element method using ambient vibration testing
… frequencies of the dam. A dam is continuously in harmonic motion due to some environmental factors such as wind. Either due to this movement of the dam itself or the internal movement of the reservoir water, a dynamic interaction occurs between the water and the dam wall where the movement of the …