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 19 of 19 for “"Transient current"”.
-
Transient current analysis for fault detection in large induction motors.
… machines, which employ the motors supply current as the diagnostic parameter, require the motor under investigation to be operating under fully loaded, steady state conditions before any useful information may be obtained. The aim of the following research project was to develop a …
-
Electrical characterizations of lithium niobate thin films in a metal-ferroelectric-semiconductor capacitor
… semiconductor interface property. The switching transient current curve from a dual polarity four pulses chain study (P-S) gives the switching time of the sample about 80--100ns. Current vs. voltage (I--V) curve is explained with a back-to-back Schottky barrier controlled conduction mechanism. …
-
GaN sensorių optinio ir elektrinio atsako charakteristikų tyrimas /
… and microwave probed photo-conductivity transient techniques, respectively. The charge collection efficiency (CCE) has been examined by surface and edge profiling of carrier drift transients by using transient current pulsed technique. These profiles were compared for the pristine and …
-
Simultaneous observations of meteors and the equatorial electrojet at Jicamarca
… trails at electrojet heights must carry intense transient currents that excite two-stream and/or gradient drift instabilities for irregularity growth. The direction of electron motion responsible for the transient current agrees with the Doppler shift of the high-frequency components in meteor …
-
Detection of Rotor and Load Faults in BLDC Motors Operating Under Stationary and Non-Stationary Conditions
Brushless Direct Current (BLDC) motors are one of the motor types rapidly gaining popularity. BLDC motors are being increasingly used in critical high performance industries such as appliances, automotive, aerospace, consumer, medical, industrial automation equipment and instrumentation. Fault …
-
Design, Development, and Evaluation of Customized Electronics for Controlling a 5-DOF Magneto-Rheological Actuator Collaborative Robot
… The hardware design is optimized to handle transient current and voltage, and dissipate heat generated by components. Moreover, software development is based on μ C/OS-II real-time operating system to handle multiple time-critical tasks and to guarantee the stability and effectiveness of …
-
Real time density functional simulations of quantum scale conductance
… coupled to gold leads and find that both the transient current and device charge density fluctuate with time,. This suggests that the steady-state assumption of the NEGF method may not be accurate.
-
Processing technology for high quality AlGaN/GaN MOSHEMT interfaces
… of high bias capacitance-voltage (CV) and transient current-voltage (IV) measurements. Organic contamination from the ohmic first process flow was attributed as being the key cause of the superior interface for the AIGaN/GaN MISHEMT processed using a gate first process flow. Finally, the …
-
Advances in Lithium Ion Batteries Obviate Need for Ultracapacitors in Electric Vehicles
… observable difference in each battery's overall transient behavior within the active hybrid topology simulation. Despite the overall battery behavior parity (due to the DC/DC converter), Individual battery cells within the LiFePO4 battery model output higher currents in the active topology due to …
-
Design and Testing of a SiC-based Solid-State Bypass Switch for 1 kV Power Electronics Building Blocks
… requires high switching frequency and high di/dt-currents for MMC operation. Due to di/dt-rate limitations, TRIAC-based switch cannot perform bypass operation. Therefore, research work has been conducted on bypass switches for PEBB1000 using wide-bandgap SiC devices. This thesis presents the …
-
Understanding and Controlling the Optoelectronic Properties of Cs2AgBiBr6 Double Perovskite
… transistor and temperature-dependent transient current measurements that grain boundaries act as the main channels for ion transport. Interestingly, I find a positive correlation between carrier mobility and temperature, which resembles the hopping mechanism often seen in organic …
-
Characterization of polymeric membranes: sulfonated polysulfones
… The membrane potential difference under applied transient current was greatly dependent on the nature of the cation, whereas the nature of the anion had no effect. The activation energy had minimal dependence on the membrane thickness, but depended on the nature of the electrolyte system. The …
-
Transient photoconduction in amorphous materials
… of computer programs capable of simulating the transient current pulses that would be expected for amorphous materials possessing known density of states distributions. Two simulation methods are used, the Monte Carlo technique and the finite difference method. While the Monte Carlo method makes …
-
Mesoscale Computational Analysis on the Reactivity of Heterogeneous Energetic Materials with Electromechanical Properties
… exceeds the dielectric breakdown strength. The transient current flow leads to resistive dissipation and temperature rise in these highly localized regions of breakdown, resulting in the formation of thermal hotspots that eventually serve as critical sites for the activation and the progression …
-
Laser-coupled scanning tunneling microscopy and spectroscopy of quantum materials and qubit defects
… has been carried out with techniques utilizing transient bias voltages requiring significant modeling for interpretation of energy-resolved measurements. In this thesis, I describe the design and construction of a new laser-coupled scanning tunneling microscope which can simultaneously achieve …
-
Packaging and Magnetic Integration for Reliable Switching of Paralleled SiC MOSFETs
… SiC MOSFETs are usually paralleled to increase current capability, considering cost effectiveness and manufacturability. For a SiC power module with current rating higher than 100 A, high did/dt and dvds/dt could possibly cause cross-turn-on (crosstalk-induced turn-on) through the gate-to-drain …
-
Developing Ternary Bismuth Chalcogenide Nanocrystals for Photovoltaics and Photodetectors
… devices from temperature-dependent transient current measurements, where a low activation energy of only 88 meV was extracted. In my third project, AgBiS<sub>2</sub> photodetectors were fabricated and characterised in depth. Aside from the broadband photo-response across from …
-
Componenti optoelettronici per applicazioni di ricerca aerospaziale e nucleare
… laser ad infrarossi pulsata basata sulla tecnica Transient Current Technique (TCT). Vengono inoltre riportati i risultati della modellazione TCAD, utilizzati per verificare la dipendenza del guadagno del rivelatore dalla tensione di polarizzazione applicata e dall'intensità del laser in ingresso. …