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.
Results
Showing 1 to 20 of 52 for “"DC bias"”.
-
Evaluation and mitigation of the undesired effect of DC bias on inverter power transformer
… and domestic consumption. Common DGs utilize DC power sources such as fuel cells, batteries, photovoltaic (solar) power, and wind power. Most of power supplies in domestic and industries are AC power consumers and, for this reason, the DC power has to be converted to meet the requirement. Two …
-
Duality derived topological model of single phase four limb transformers for GIC and DC bias studies
Geomagnetic disturbances brought about by solar activity cause geo-electric fields in the Earth that drive geomagnetically induced currents through the earthed neutrals of transformers and through power transmission networks. The flow of these currents causes the magnetic cores of transformers to …
-
Using multiplexers to study the statistics of quantum phenomenon in one-dimensional wires
… investigate the formation and development of the DC-bias-induced 0.75 and 0.25 anomalies for 402 QPCs. We find the anomalies evolve similarly in a magnetic field. To explain the anomaly behaviours, we propose a phenomenological DC-bias-induced spin-splitting model. In the model, with the …
-
Nearly Monoenergetic Positive Ion Beam with Self-Neutralized Space Charge Extracted from a Pulsed Plasma and Its Application
… ion beam was realized by applying a synchronous DC bias to a “boundary electrode” in the afterglow (power-off) of the plasma. A retarding field energy analyzer (RFEA) and a movable Faraday cup were used to measure the IED and the time resolved ion and electron current densities, as a function of …
-
Power transformer magnetization under GIC/GMD
… magnetization under GIC. It reviews both dc and ac saturation patterns of five transformer core designs. Magnetic fields along various traverses for dc excitation are presented. Impedance matrix entries of a single phase transformer are compared for normal and dc operations. New …
-
The Electrical Impedance Responses of Protective Oxide Scales on Stainless Steels That Are Immersed in Molten Lead-Bismuth-Eutectic Alloy at Temperatures Up to 600°C
… oxygen content of the LBE, and applied DC bias. DC voltages that were apparently generated by the oxide layers themselves were also observed. The resistances were one or more orders of magnitude greater than the published resistances of pressed, sintered pellets of similar oxide …
-
The electrical impedance responses of protective oxide scales on stainless steels that are immersed in molten lead-bismuth-eutectic alloy at temperatures up to 600°C
… oxygen content of the LBE, and applied DC bias. DC voltages that were apparently generated by the oxide layers themselves were also observed. The resistances were one or more orders of magnitude greater than the published resistances of pressed, sintered pellets of similar oxide …
-
Quantum Tunneling of Charge-Density Waves in Quasi-One-Dimensional Conductors (Trichalcogenide, Tantalum Trisulfide, Niobium-Triselenide)
… is characterized by extensive measurements of dc conductivity, ac admittance, direct mixing, harmonic mixing, second harmonic generation, and third harmonic generation as functions of dc bias voltage, applied frequencies, and, in some cases, the amplitude of an additional ac signal. …
-
Plasma Processing of Superconducting Radio Frequency Cavities
… etch rate dependence on the pressure, rf power, dc bias, temperature, Cl<sub>2</sub> concentration and diameter of the inner electrode was determined. The etch rate mechanism was studied by varying the temperature of the outer wall, the dc bias on the inner electrode and gas conditions. In a …
-
Kinetic Inductance Characterization of Thin 2H-NbSe₂ Superconductor Using Circuit Quantum Electrodynamics
… of the thin NbSe₂. Furthermore, we characterize DC bias current, and microwave power dependence of the kinetic inductance in the hybrid Al-NbSe₂ resonators. Our approach contributes to understanding the both DCand ACproperties of superconducting 2D materials with potential implications for their …
-
Characterization of rf cylindrical magnetron plasmas and reactive ion etching of silicon/silicon dioxide: Its effect on radiation damage and contamination
… the plasmas became more resistive and the dc self-bias voltage at 1.8MHz was much higher than at 13.56MHz. The measured time-averaged ion densities for Ar plasmas varied as a function of radial position between the two electrodes, from 1 $\times$ 10$\sp9$ cm$\sp{-3}$ to 5 $\times$ 10$\sp9$ …
-
Antenna Multi-Band Enhancement by Employing Negative Impedance Converters
… Performance measurements at both, without DC bias and 10 V, revealed a notable difference in matching between the active and passive states, confirming that the NIC effectively supersedes the passive matching of its components.</p>
-
Pseudospin transfer torques and the effect of disorder in semiconductor electron bilayers
… and can lead to time-dependent response to a dc bias voltage. In addition, we study the eff ects of disorder on the interlayer transport properties of disordered semiconductor bilayers. We find that the addition of material disorder to the system affects interlayer interactions leading to …
-
Amplifier Architectures for Wireless Communication Systems
… matching networks. Additionally, a passive DC bias network is used instead of an active DC bias network to avoid possible complications due to the lumped elements parasitic effects. The matching networks are designed based on the reflection coefficients that are derived based on the …
-
High Frequency Magnetic Core Loss Study
… on the AC flux frequency, amplitude, waveform, DC bias and temperature. These dependences are nonlinear and difficult to predict. How to measure, model and analyze the core loss is a challenge for decades. In this dissertation, two new core loss measurement methods are introduced first. These …
-
Microwave Signal Generation Using Self-Heterodyning of a Fast Wavelength Switching SG-DBR Laser
… inputs. Linewidth results with respect to device DC bias conditions are also presented. Time resolved frequency step measurements have shown inherent thermal transients of approximately 200 ns upon wavelength switching. From the square wave switching profile, switching times of approximately 24 ns …
-
Magnetoelectric laminated composites and devices
… giant ME voltage coefficients and small required DC magnetic biases. Besides, the laminates have a good directional dependence of the magnetic field: it can only sense the magnetic field along its longitudinal direction. Symmetric bimorph and differential mode magnetoelectric laminates have been …
-
Design and analysis of an electrically small inductively loaded sector antenna for frequency reconfiguration using varactor diodes
… In order to allow for frequency agility, a DC bias network is carefully designed utilizing blocking capacitors to allow for an impedance match over the bands of interest. Characterization of the antenna on different ground plane sizes and construction issues are also addressed. Finally the …
-
An investigation of the statistical properties of ion acoustic turbulence
… of ion acoustic turbulence in a helium DC discharge are investigated by means of the first order probability density function of the fluctuating potential as detected by a Langmuir probe. Measurements are reported for several pressures in the range of 0.050 to 0.200 torr. At all of the …
-
Investigation of electrically tunable diode-based nonlinear transmission lines as pulse shaping networks for microwave systems at megawatt peak powers
… lines (D-NLTL), which use the reverse bias p-n junction of a diode as a nonlinear permittivity. The presented research aims to enhance frequency generation, power output, and network efficiency, with a simultaneous focus on the design process employed in D-NLTL production. The first of …
Page 1 of 3