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 33 for “"VDC"”.
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VDC framework proposal for curtain wall construction process optimization
… the stakeholders, and the installation itself. A VDC framework is proposed to overcome these challenges, including an implementation workflow and an interrelationship map between the VDC components. This study specialized on a multiuse 12,000 m2 building under construction in Lima, Peru, resulting …
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The use of Geographical Information Systems for Disaster Risk Reduction strategies: a case study of Volcán de Colima, Mexico
… which is imperative at Volcán de Colima (VdC), Mexico, due to the predicted, large-magnitude eruption forecasted to occur before 2025. The methods used to gauge social vulnerability included the development and application of proxies to census records, the undertaking of a building …
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The Proposal for Implementation of Controlled Power Rectifier (3000/4000KW) in MTA New York City Transit (MTA-NYCT)
… 2800 Amps to 3600 Amps, and Voltage level 450 VDC to 600 VDC in running condition. In this Simulation, with controlled rectifier system, subway cars load current level are 3200 Amps to 4000 Amps, and Voltage level 550 VDC to 625 VDC established.</p> <p>These experiments led to the conclusion …
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Implementación de la metodología virtual design and construction para la gestión de sistemas de elementos prefabricados en la ejecución del casco estructural de un proyecto multifamiliar en Lima, Perú
… la metodología Virtual Design and Construction (VDC) en la gestión del sistema de prefabricados de los elementos estructurales como vigas y losas, con el fin de lograr optimizar tiempos y costos en la ejecución del casco estructural de un proyecto multifamiliar en Lima, Perú. De este modo se …
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An analysis of economic growth, energy consumption and carbon emissions:the case of Zambia
… granger causality and variance decomposition (VDC) to determine cointegration and direction of causality among the three variables. The overall results show that energy consumption is vital in driving Zambia’s economy and that pursuance of energy conservation policies, such as rationing energy …
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An analysis of economic growth, energy consumption and carbon emissions:the case of Zambia
… granger causality and variance decomposition (VDC) to determine cointegration and direction of causality among the three variables. The overall results show that energy consumption is vital in driving Zambia’s economy and that pursuance of energy conservation policies, such as rationing energy …
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A 3-phase Z-source inverter driven by a novel hybrid switching algorithm
… supply that can vary over a range of 20 to 70 Vdc. This is done with a Zsourceinverter topology which is a single conversion method with no additionalDC to DC boost converter. A novel DSP control algorithm allows the inverter toachieve the following:· Run Space Vector Pulse Width Modulation …
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Power factor correction using a boost quasi-resonant converter
… of 1 megahertz, with a 115 VRMS input, 200 VDC and 100 watt output.
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A line and load independent zero voltage switching DC/DC full bridge converter topology
… simulation results of a prototype 500 W 350-400 Vdc to 55 Vdc converter operating at 100 kHz verify the analysis and design, and show an overall efficiency of greater than 97% at full load.
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Studies on the role of the autonomic nervous system in airway hyperreactivity.
… trachea. The voltage-dependent Ca2+ - channel (VDC) blocking drugs, verapamil and nifedipine, attenuated responses to applied ACh and stimulation of the vagus nerve in untreated tissues, indicating significant VDC involvement in the production of spontaneous and evoked tone. The calmodulin …
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Identifying and estimating the distributional effects of unionization and the long-term consequences of military service
… educated, leaving the relative attractiveness of VDC for less skilled men and the work disincentives embedded in the VDC system as a likely explanation.
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Radio frequency power amplifiers for portable communication systems
… output of 3 W, a battery supply voltage of 9 Vdc, and a sinusoidal-type signal to be amplified. Both classes are evaluated through recent research literature and simulated using the PSpice® computer simulation program. Class CE and class F are found to provide efficiencies exceeding 80 percent …
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Model-Based Vehicle Dynamics Control for Active Safety
… algorithms. A key parameter for virtually all VDC systems is the friction coefficient. Model-based friction estimation based on the physically-derived brush model is investigated.
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ZnGa₂O₄ and ZnGa₂O₄:Mn²⁺ for potential use in vacuum fluorescent displays
… measured as a function of anode voltage (10-300 VDC). The effects of activator concentration, phosphor layer thickness, deposition process, and internal pressure were examined. From photoluminescence measurements, absorption and emission centers were identified, the role of composition in the …
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Enhanced Gate-Driver Techniques and SiC-based Power-cell Design and Assessment for Medium-Voltage Applications
… of n=99.3 %@10 kHz. It successfully operated at Vdc=6 kV, I=84 A, fsw>5 kHz, Tj<150 degrees Celsius and had high switching speeds over 100 V/ns. Lastly, to achieve high-power density and high-efficiency on the MV converter level, challenges of high-voltage insulation, high-bandwidth control, EMI, …
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Jellyfish Inspired Underwater Systems and Technologies
… stored in 0.5M KCl solution actuated at 4 VDC potential and produced an impressive 90% tip deflection. In addition, the rate of change was extremely high at 50% deflection of initial actuator length per second. The artificial jellyfish statocyst was found to produce the required highly …
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Design and prototyping of a low-cost portable mechanical ventilator
… is driven by a stepper motor powered by a 14.8 VDC battery and features an adjustable tidal volume of up to 900 mL, adjustable breaths per minute (bpm) of 5-30, and inhalation to exhalation time ratio (i:e ratio) options of 1:2, 1:3 and 1:4. Tidal volume, breaths per minute and i:e ratio are set …
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A Framework for BIM Model-Based Construction Cost Estimation
… an existing virtual design and construction (VDC) model review software. The computation engine supports BIM authoring and reviewing BIM data. The Framework’s quantification and costing module was compared to existing methods in a case study. The outcomes of the model-based system demonstrated …
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Designing and Implementing a Micro-controller based Primary-side Sensing Flyback Converter for LEDs Driver
… design specifications: the output voltage is 32 VDC while the load current is 350 mA. More importantly, the simulation results demonstrated the feasibility of deploying a primary-side sensing flyback converter in conjunction with a PIC18F micro-controller as an LED driver. Next, a demo …
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