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 91 for “"multi-frequency"”.
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Multi-frequency cable vibration experiments
A series of Multi-Frequency cable vibration experiments at Reynolds number 7600 were carried out at the MIT Tow Tank using the Virtual Cable Towing Apparatus (VCTA). Motions observed in a Direct Numerical Simulation of a flexible cylinder in a shear current were imposed on the VCTA and force …
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Multi-frequency Ultrasound Directed Self-assembly
… patterns, limited by the use of single-frequency ultrasound wave fields. Acoustic holography and acoustic waveguides provide alternatives to assembling complex patterns of particles, but generally provide low spatial accuracy and are not re-configurable because they require custom …
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A multi-frequency study of symbiotic stars
Multi-frequency observations using a wide variety of telescopes and instrumentation have been used to throw light upon some of the physical characteristics of symbiotic stars. A detailed understanding of these enigmatic binaries requires the planning of large, simultaneous observing campaigns to …
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Multi-frequency studies of powerful radio sources.
… the la~ge-scale radio lobes and hotspots . Multi-frequency observations with up to five frequencies have been made for a number of ~ources using the Cambridge 5-km telescope and the Very Large Array. These data have been used to determine the change in radio spectra across the source . to …
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Multi-Frequency Electronic Magnetic Resonance Studies of Polycrystalline Systems
… to line-broadening. This thesis describes how a multi-frequency approach applied to the EMR studies of two distinct polycrystalline paramagnetic systems resulted in dramatic resolution improvements.
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Multi-Frequency Processing for Lumen Enhancement with Wideband Intravascular Ultrasound
The application of high frequency ultrasound is the key to higher resolution intravascular ultrasound (IVUS) images. The need to further improve the IVUS spatial resolution may drive the transducer center frequency even higher than the current 40 MHz range. However, increasing the center frequency …
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Development of a multi-frequency interferometer telescope for radio astronomy (MITRA)
Submitted in fulfilment of the academic requirements for the Degree Master of Engineering: Electrical Engineering, Durban University of Technology, Durban, South Africa, 2015.
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Cryo-electron microscopy image analysis using multi-frequency vector diffusion maps
… this thesis, we propose a novel approach called multi-frequency vector diffusion maps (MFVDM) to improve the efficiency and accuracy of cryo-EM 2D image classification and denoising. This framework incorporates different irreducible representations of the estimated alignment between similar …
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Multi-frequency characterization of single cells through CM factors and dielectrophoresis
… properties of single cells by observing them at multiple frequencies. We first simulate experimental conditions to show that as we increase the number of measured frequencies, we are able to better discriminate among different cells. Furthermore, we use the simulation to find the optimal number …
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Distribution, patchiness, and behavior of Antarctic zooplankton, assessed using multi-frequency acoustic techniques
… of acoustic volume backscattering at the single frequency of 120 kHz was first examined as an index of the overall biomass of zooplankton. Distinct spatial and seasonal patterns were observed that coincided with advective features. Improved parameterization was then achieved for a theoretical …
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Distribution, patchiness, and behavior of Antarctic zooplankton, assessed using multi-frequency acoustic techniques
… of acoustic volume backscattering at the single frequency of 120 kHz was first examined as an index of the overall biomass of zooplankton. Distinct spatial and seasonal patterns were observed that coincided with advective features. Improved parameterization was then achieved for a theoretical …
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A Multi-Constellation Multi-Frequency GNSS Software Receiver Design for Ionosphere Scintillation Studies
… among the three signals. In this study, a multi-constellation multi-band GNSS software receiver has been developed based on USRP2, a general purpose radio platform. The C++ class-based software receiver were developed to process the IF data for GPS L1, L2C, and L5 and GLONASS L1 and L2 …
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Multi-frequency Ultrasound Transducers and Their Applications in Tissue Ablation and Intravascular Acoustic Angiography.
North Carolina State University Theses Mechanical and Aerospace Engineering.
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Finite element modelling and image reconstruction in single and multi-frequency electrical impedance tomography.
… to be calculated during image reconstruction. Multi-frequency EIT is a modified approach of the single frequency method by which tissue characterisation has been proposed by imaging the internal conductivity of region over a range of frequencies. However, due to instrumentation drawbacks, only …
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A multi-frequency study of an X-ray selected sample of active galactic nuclei
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1992.
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'Powellsnakes', a fast Bayesian approach to discrete object detection in multi-frequency astronomical data sets
… (unresolved objects), SZ clusters, single or multi-channel detection. An emphasis is placed on the necessity of a multi-frequency, multi-model detection algorithm in order to achieve optimality. We have chosen to use the Bayes/Laplace probability theory as it grants a fully consistent …
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Search and multi-frequency follow-up studies of radio transients: novel approaches and large campaigns
… optical/infrared counterparts. On one side, a multi-wavelength (MWL) detection of a FRB would lead to the confirmation of the aforementioned FRB/magnetar connection and/or to the evidence that other classes of astrophysical objects/events could be also responsible for a fraction of these radio …
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‘Powellsnakes’, a fast Bayesian approach to discrete object detection in multi-frequency astronomical data sets
… (unresolved objects), SZ clusters, single or multi-channel detection. An emphasis is placed on the necessity of a multi-frequency, multi-model detection algorithm in order to achieve optimality. We have chosen to use the Bayes/Laplace probability theory as it grants a fully consistent …
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