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 9 of 9 for “"reflecting surfaces"”.
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Determination of acoustic ray paths in enclosed spaces
… if the location of the source, receiver and all reflecting surfaces were known. Assuming a point source, the distances along the calculated ray paths were used along with the power level of the source and the absorptive characteristics of all the reflecting surfaces to determine the sound …
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Incoherent projection Moire contour sensing with coherent processing for large structures
… out-of-plane displacements of large diffusely reflecting surfaces. The operation of the system is divided into two processes. The first process records an incoherent moire pattern which contains the out-of-plane displacement information. The second process uses a transduced coherent image of …
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A feasibility study of the use of microwaves to measure radical and differential burning rates in solid propellant rockets
… difference of the reflected microwaves from the reflecting surface of the spiral and the reflected microwaves from a stationary reference surface. The reflected microwaves changed in phase relation producing successive minimum values in the detected signal for each one-half of a microwave …
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Dynamic Metasurface Grouping for IRS Optimization in Massive MIMO Communications
Intelligent Reflecting Surfaces (IRSs) grant the ability to control what was once consideredthe uncontrollable part of wireless communications, the channel. These smart signal mirrors show promise to significantly improve the effective signal-to-noise-ratio (SNR) of cell-users when the …
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Optische Vermessung partiell reflektierender Oberflächen
Die vorliegende Arbeit befaßt sich mit der dreidimensionalen Rekonstruktion reflektierender Oberflächen. Dabei wird sowohl die Oberflächenform als auch die absolute Lage im Raum bestimmt. Es werden Oberflächen behandelt, die einerseits total reflektieren, andererseits diffuse und spiegelnde …
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On enhancing connectivity and efficiency in 5G and emerging 6G mobile networks
… coverage blind spots. The role of Intelligent Reflecting Surfaces (IRS) is then explored for mmWave and sub-6 GHz communications, showing that IRS-assisted links enhance spectral efficiency while substantially reducing required transmit power. Finally, the thesis investigates machine …
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Probing Exciton Dynamics in Metal–Organic Frameworks
… in MOFs can be inherently aligned with the reflecting surfaces of their surrounding microcavity, which enables potential control over excitons’ interaction with the waveguide modes confined in the crystal. Broader implications and future possibilities unlocked by these observations will be …
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Aufbau und Validierung einer digitalen Messstrecke für die dynamische Bestimmung der Krümmungsradien und der Lage der menschlichen Augenlinse unter natürlichen Sehbedingungen
… by two infrared light sources. In this way reflecting images were produced at the anterior corneal surface and the anterior and posterior lens surface, the so-called Purkinje images I, III, and IV. They were then registered and measured by a camera taking pictures of infrared light. The size …
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Development of a Model for Predicting the Transmission of Sonic Booms into Buildings at Low Frequency
… the acoustic modes of the rooms with perfectly reflecting surfaces (hard walls). This approach is simple to implement and computationally efficient at low frequency, when the modal density is relatively low. The numerical model is designed specifically for this application and includes several …