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 16 of 16 for “"Microwave measurements"”.
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Remote sounding of the upper atmosphere by microwave measurements.
Massachusetts Institute of Technology. Dept. of Electrical Engineering. Thesis. 1965. Ph.D.
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A physical model to estimate snowfall over land using microwave measurements
… of snow falling over land surfaces. Because microwave emitted by snow-covered surfaces are highly variable, precipitating snow above such surfaces is difficult to observe using window channels that occur at low frequencies (nu < 100 GHz). Furthermore, at frequencies nu < 37 GHz, sensitivity …
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Characterization of reactive ion etching of III-V compound semiconductor materials
… doped field-effect transistors (MODFETs). The microwave measurements of reactive-ion-etched and wet-etched devices show identical performance.
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Ultralow-noise modelocked lasers
… levels is solved by a combined use of microwave and optical measurement techniques that yield complete characterization of the laser noise from DC to half the laser repetition rate. Optical cross-correlation techniques are shown to be a useful tool for quantifying fast noise processes, …
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Ultra-Wideband Wireless Channels - Estimation, Modeling and Material Characterization
… technologies. Channel models, commonly based on measurements, can be used to evaluate the performance of such systems. We therefore, we started by performing measurements at one of the scenarios where infostation systems can exist in the future, namely, petrol stations. The idealized model, was …
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Fabrication and Characterization of Superconducting Metamaterial Resonators
… processing as well as quantum optics in the microwave regime. Engineered quantum systems with a dense spectrum of modes coupled to artificial atoms, or qubits, formed from superconducting circuits offer an opportunity to explore large-scale entanglement or perform quantum simulations of …
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A geospatial analysis of Arctic marine traffic
… concentration data based on satellite passive microwave measurements were used to calculate the extent of open water and duration of the sea-ice season. Second, ship traffic on the Arctic Ocean was analysed to determine the present patterns of human activity. Time-stamped AIS messages encoded …
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An Ocean Surface Wind Vector Model Function For A Spaceborne Microwave Radiometer And Its Application
… data. Over the last three decades operational measurements of global ocean wind speeds have been obtained from passive microwave radiometers. Also, vector ocean surface wind data were primarily obtained from several scatterometry missions that have flown since the early 1990's. However, other …
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Measurement of snowpack properties using active FM-CW microwave systems
This paper reports on the use of an FM-CW active microwave system, in a research mode, to remotely sense water equivalence and liquid water content of snowpacks. A three-component "electrical path length" dielectric mixture model is described which accounts for the microwave system response as a …
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Characterization of uncertainty in remotely-sensed precipitation estimates
… precipitation products from Special Sensor Microwave/Imager (SSM/I) instrument. The SSM/I microwave measurements are used for quantitative precipitation rate retrievals and they are key to the development of precipitation data products with high temporal sampling. Results show marked …
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Dissipative processes in superconducting nanodevices: nanowire-resonators, shunted nanowires, and graphene proximity junctions
… of nanowires as qubits. Superconducting coplanar microwave waveguide resonators have also become a popular way of studying superconducting junctions and qubits, as they provide an extremely low noise environment. For example, superconducting two-dimensional Fabry-Perot resonators have been used by …
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EFFECTS OF STRAIN ON DIELECTRIC PROPERTIES OF FERROELECTRIC Ba0.5Sr0.5TiO3 FILMS
… attention on applications in miniature tunable microwave components with high performance and cost reduction, such as phase shifters, tunable oscillators, delay lines, and antennas. These tunable devices require large change in the dielectric constant with applied field and a low loss at …
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Dielectric Measurements for Organ Cryopreservation
… heating using electromagnetic energy at microwave frequencies. Crucial to the design of any such rapid warming system are the electrical properties of the material to be heated. This dissertation describes two measurement systems that have been developed for measuring the electrical …
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Informing on Crop Water-Use, Stress, and Growth with Integrated Satellite Remote Sensing and Modeling
… that operate in the thermal infrared (TIR) and microwave wavelengths have proven useful to assess crop conditions. Assessing the ability of TIR and microwave measurements, individually and in combination, offers the ability to reduce measurement gaps and retrieve crop conditions, <em>e.g.</em> …
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Investigation of microwave cavity applicators for plasma assisted CVD diamond synthesis and plasma assisted combustion
Thesis (Ph. D.)--Michigan State University. Electrical Engineering, 2010