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 85 for “"constant-current"”.
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Constant current electronarcosis of market poultry
… of market chicken and turkeys. A prototype constant current stunner designed at the Department of Electrical Engineering of Virginia Polytechnic Institute and State University was used. Broilers were electrically stunned with 8, 29 and 50 mA per bird. Turkeys were electrically stunned with …
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Multi-Channel Constant Current (MC3) LED Driver for Indoor LED Luminaries
… LED lighting application, to provide multiple current source outputs for multiple LED strings, traditional solutions usually adopt a two-stage structure, which is complicated and cost-ineffective. How to design a simple, low-cost and efficient LED driver with multiple current source outputs is …
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A high-frequency series-type inverter operating from a source of constant current
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering, 1938.
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A multistage-constant-current, temperature-controlled, health-conscious fast charging algorithm for lithium-ion batteries
… This thesis proposes a closed-loop Multistage-constant-current, Temperature-controlled (MCC-TC), Health-conscious Fast Charging strategy, which modulates the charging current considering the battery temperature as feedback. The experimental validation on an automotive grade battery cell depicts …
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The Precise Determination of Equilibrium Constants by Constant Current Coulometry. The Copper - Cuprous - Cupric System
Made available in DSpace on 2014-12-05T19:37:54Z (GMT). No. of bitstreams: 1 6200651.pdf: 3523975 bytes, checksum: 56f374c0144be3a420f64efc560992e0 (MD5) Previous issue date: 1961
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Integrated Microbattery Charger for Autonomous Systems
… The battery charger chosen for this design is a constant current battery charger. Two methods of regulating the constant-current are discussed. A published shunt regulator design is analyzed and is presented with enhancements to the design. A series regulator that controls the current to the …
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tDCS effects on synaptic plasticity and motor skill learning
<p>Transcranial direct current stimulation (tDCS) is a non-invasive brain stimulation technique that involves the application of low-intensity constant current to the brain through electrodes placed on the scalp. Its potential to enhance brain function and treat brain-related disorders has led to …
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Design Automation for Reliable CMOS Chip Input/output Circuits
… (integrator circuit) in iETSIM only applies for constant current stress. A general thermal model using convolution is developed. New techniques are proposed to implement a thermal convolver, including regionwise-exponential (RWE) approximation and recursive convolution. The efficiency of the new …
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Diffusion of hydrogen in metal membranes deformed in tension
… in tensilely deformed iron and nickel membranes. Constant current permeation tests, current pulse tests and potentiostatic depletion tests were performed to determine which test produced the most reliable and reproduceable data. The bulk lattice diffusivity in annealed nickel at 22°C was found to …
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NOVEL APPROACHES TO FAST OCV CHARACTERIZATION AND IMPROVED CAPACITY ESTIMATION IN LITHIUM ION BATTERIES
… is done by collecting voltage and current data through a slow discharge and charge process; this process usually takes about 60 hours. Such OCV-SOC characterization is performed on a few sample batteries because the OCV-SOC characterization is considered to be the same for new …
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Tractive Performance From Axle Instrumentation
… in an unreduced section of axle. Two four-gage, constant current, semiconductor strain gage bridge circuits were developed to measure the strains associated with the bending forces. The analog strain signals were converted to FM signals on the axle. A multi-channel capacitor with rotating and …
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Porous Silicon as Broadband Antireflector for Photovoltaic Application.
… platinum was the counter electrode performed at constant voltage and constant current modes. For the constant voltage mode, three, ten, and thirty minute anodized samples exhibited average reflectances of ~6%, ~5% and ~7% respectively in the ultra-violet to the near infra-red regions. For …
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Design of power delivery networks for noise suppression and isolation using power transmission lines
… signal transmission lines induce return currents on the power and ground planes. The return current always follows the path of least impedance on the reference plane closest to the signal transmission line. The return current path plays a critical role in maintaining the signal integrity …
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Durability study of proton exchange membrane fuel cells via experimental investigations and mathematical modeling
… of hydrogen-air PEMFCs is examined with a cyclic current profile and under constant current conditions. The end-of-period diagnosis is performed for both MEAs at 100h aging intervals, including a series of cell polarization, impedance and electrochemical experiments. The results demonstrate that …
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A study of effects of inhibitors on cathode potentials of metals in dilute acids
… surface. The potential required to keep a constant current of one milliampere flowing from cathodic corrosion specimens through dilute acid solutions to which one or more known or commercial inhibitors had been added was measured against a saturated calomel reference electrode. Platinum, …
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Dynamic load modeling in power system analysis
… to compare the results with those obtained using constant impedance or constant current load models. A least-squares curve fit algorithm is developed and used in modeling static and quasi-static loads as a function of the bus voltage. A dynamic model for the induction machine which accounts for …
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High Frequency Study of Magnetic Nanostructures
… of Nickel Nanowire in commercial AAO template in constant current (Galvanostatic) mode, further we tried to estimate the growth rate from theory, from saturation magnetization and direct measurement from SEM image.</p> <p>In part two we focused on using the Vector Network Analyzer (VNA) to measure …
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Analytical Methods Development for High-Throughput Photochemisty With Led Arrays
… cost, light intensity, and light stability. Two constant current drivers were evaluated with respect to LED array performance. The optimized third generation LED array was evaluated as the photolysis source for photochemical hydrogen production experiments using the supramolecular catalyst …
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Constant-temperature constant-voltage charging method for lithium-ion battery technology
… can hamper the life cycle due to higher currents applied to the battery because of the Li-ion battery's uncontrolled temperature increase. This thesis evaluates the Constant-Temperature and Constant-Voltage (CT-CV) charging methodology for three different Li-ion batteries over a …
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