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 70 for “"direct conversion"”.
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Integration of broadband direct-conversion quadrature modulators
… phasing method. Since filter Q-values rise in direct relation to the transmitted frequencies, the filtering method is generally not feasible for integrated microwave transmitters. A quadrature modulator realizes the phasing method by combining signals phased at quadrature (i.e. at 90° offsets) …
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Direct conversion of methane under non-oxidative conditions
Abstract available p.ii
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Rational Catalyst Design for Direct Conversion of CH4 and CO2
… catalyst for low-temperature: 200C - 450C) direct conversion of methane and carbon dioxide by tailoring the structure of each active component using the insights from molecular modeling.</p><p>Pt nanoparticles supported on ceria support have been selected based on molecular modeling and …
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Wideband direct conversion IQ modulators in indium phosphide DHBT technology
… this question, I focused on designing a direct conversion IQ modulator that could be useful across the full bandwidth of existing vector signal generators and also extend that bandwidth beyond the current state of the art. I employed a circuit architecture in which the limiting factor for …
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Kinetic and mechanistic studies for the direct conversion of syngas to ethanol
The direct conversion of syngas to ethanol (STE) is a promising route to ethanol from fossil and non-fossil carbon resources. Rh-based catalysts offer the most promising results so far. However, the accomplished yields and rates still must be improved before industrial applications become viable. …
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Amorphous hydrogenated boron carbide for solid-state direct-conversion thermal neutron detection
… for potential application in solid-state direct-conversion thermal neutron detection. We have investigated the effect of single-carrier transport and low charge carrier mobility, which are expected in a-BC:H films, on detection efficiency and spectral performance of a thin-film B4C …
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Direct conversion of carbon dioxide into diethyl carbonate on nanosized cerium-based catalysts
L'abstract è presente nell'allegato / the abstract is in the attachment
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Direct conversion of chemical energy to mechanical work using a phosphate charged protein
Nature is able to convert chemical energy into mechanical work under modest conditions, i.e., physiological pH and ambient temperature and pressure. One of the most interesting systems is muscle modeled as the "sliding filament" system. The sliding filament system is a combination of a thin actin …
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Process Study, Simulation, and Optimization of the Direct Conversion of Biomass to Ethyl Levulinate
… like levulinate esters. In this work, the direct chemical conversion of lignocellulosic biomass to ethyl levulinate (EL) through LA was studied in collaboration with Gascon Biomass Research Inc. in an effort to valorize their surplus of lignocellulosic feedstock obtained from biomass …
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Direct conversion of cellulosic biomass to ethanol by mixed culture fermentation of Clostridium thermocellum and Clostridium thermosaccharolyticum
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Nutrition and Food Science, 1982.
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Effect of silicon carbide (SiC) on mechanical and physical properties of solid state recycled aluminium aa6061 by using hot extrusion method
… recycling aluminium which are conventional and direct conversion methods. Direct conversion method is a current approach that excludes the metal chips re-melting process compared to the conventional recycling method. Direct conversion in a hot extrusion process that contributes to the green …
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Nested chopper stabilization in analog multipliers and mixers
… as a squarer, variable gain amplifier, and direct-conversion mixer, demonstrating that chopper stabilization is effective for both DC and AC multiplication. The AC measurements show that chopping removes not only offset, but also 1/f noise and 2nd-order harmonic distortion. The specific …
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Six-port wireless receiver architectures
This work describes novel six-port direct conversion digital receiver architecture.<br/><br/>A general review of six -port reflectometer theory and architectures is presented. Three six-port architectures suitable for MMIC realization are discussed. <br/><br/>A new broadband six-port direct …
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Fault-tolerant passively integrating in-vivo dosimeters for feedback-enabled proton therapy (IF²D, or integrating feedback F-center dosimeter)
… for their f-center properties which enable a direct conversion between the wavelength of the irradiated salt i.e. color change, and the expected radiation dose. We expect that analytical calculations between wavelength and expected radiation dose will correlate with experimental data. A direct …
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Catalytic conversion of methane to partially oxidized products over copper-exchanged zeolites
The selective conversion of methane to liquid oxygenated compounds is a grand challenge in catalysis. Although natural gas can be processed industrially in large-scale facilities, new catalytic processes are required that economically directly convert methane to liquid products in small-scale units …
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An Investigation of Photovoltaic Power Optimization
… switching with a non-linear step size DC-to-AC direct conversion on systems that employ photovoltaic (PV) power as an input source. These techniques exhibit dramatic reductions in circuit complexity and power dissipation compared to traditional pure sine-wave inverters. However, designing …
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Modeling Alzheimer's Disease Using Cellular Reprogramming Technologies
… neuronal (iN) cell technology allows for the direct conversion of somatic cells to neurons. Here I demonstrate the modeling of Alzheimer's disease (AD) using both iPS and iN cellular reprogramming technologies. These bioengineered human cell-based models of AD provide unique and invaluable …
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Experimental studies of the thermoelectric properties of microstructured and nanostructured lead salts
Thermoelectric devices allow for direct conversion between thermal and electrical energy. There applications, however, are severely limited by their inefficiency. A reduction in thermal conductivity of a material potentially enhances its overall thermoelectric performance and can improve the …
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Development of a catalytic enantioselective intramolecular Stetter reaction: catalyst development and synthetic applications
… has been developed. The process involves direct conversion of an aldehyde into a chiral acyl anion equivalent and its addition into a pendant electron-deficient olefin. The development of chiral bicyclic nucleophilic carbene catalysts has allowed for increased efficiency and selectivity in …
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The synthesis of methyl-2-acetamido-3,4,6-0-triacetyl alpha-D-talosaminide
… short, the above route involved essentially a direct conversion from the idose series into the talose series which is illustrated in Scheme I.</p>
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