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 27 for “"VSD"”.
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Condition Monitoring of VSD-fed Induction Motors
Induction motor drives are presently the most fully fledged technology amidst the various motor drives not utilising commutators [1]. They consist of an induction motor (IM) fed from a variable frequency AC inverter. They are mostly used in applications which need good dynamic and steady state …
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Effects of Input Power Factor Correction on Variable Speed Drive Systems
The use of variable speed drive (VSD) systems in the appliance industry is growing due to emerging high volume of fractional horsepower VSD applications. Almost all of the appliance VSDs have no input power factor correction (PFC) circuits. This results in harmonic pollution of the utility supply …
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Multiple Three-Phase Induction Generators for Wind Energy Conversion Systems
… this thesis uses vector space decomposition (VSD) to implement the control, while individual winding set flux/torque producing currents are governed by finding the relationships between MS and VSD variables. This approach has all the advantages of both MS and VSD, i.e. access to individual …
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Electrostatic Interactions in the Voltage Sensor of Kv7.1 and Iks Channels
… of two domains: the voltage-sensing domain (VSD) and the pore. The VSD of Kv7.1 is comprised of four transmembrane helices (S1-S4), with conserved basic residues in S4 moving across the membrane in response to changes in transmembrane voltage and conserved acidic residues in S2 and S3 that …
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Perceptual Differences in the Conversational Performance of People with Severe Expressive Aphasia Using Three Types of Visual Screen Displays on Speech Generating Devices
… Condition B--SGD with visual scene display (VSD); and Condition C--SGD with traditional grid display (TGD). Quantitative data were collected in the forms of preference choice of display type, a forced-choice ranking of experimental sessions, and 7-pt Likert rating scales. All participants …
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A Search For Genetic Modifiers Responsible For Congenital Heart Disease Variability In The Presence Of Nkx2-5 Haploinsufficiency
… C57Bl/6 to muscular ventricular septal defects: VSD). Genome wide linkage analysis was conducted on 306 mice from the FVB/n F2 intercross and 80 mice from the A/J F2 intercross diagnosed with VSD to map main effect and interacting loci that correlate with risk. Additionally the possibility of …
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Torque Controlled Drive for Permanent Magnet Direct Current Brushless Motors
… implementation of a simple variable speed drive (VSD) based on a brushless direct current (BLDC) machine and discrete logic circuits. A practical VSD was built, capable of operating a BLDC machine in two quadrants, motoring and regenerative braking. The intended applications are electric scooters …
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Switched-doubly-fed-machine drive for high power applications
… this "knob" is through variable-speed drives (VSD), which are power-electronic based converters with associated control operating as an interface between the electrical machine and the electrical source. These drives are not only critical in a wide range of applications including industrial …
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Independent power flow control of multiple energy sources using a single electric machine
… schemes are based on vector space decomposition (VSD) rather than multi-stator (MS) approach. The former approach has a unique harmonic mapping and a single flux and torque producing subspace. Primarily in the thesis, current sharing strategy has been developed for both symmetrical and …
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Surgical techniques used for closure of perimembranous ventricular septal defects
… Group I consisted of 77 children who had their VSDs closed between 1987 to 1990, mainly with a double velour dacron patch using interrupted alternating 5.0 silicone coated braided polyester suture ( Ticron®) and 5.0 polypropylene (Prolene®) pledgetted sutures (n=71). Five patients in Group I had …
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Agent-based ethical decision-making control optimization framework for self-driving vehicles
… a double yellow line.The value-sensitive design (VSD) iterative process is used to formalize the link between human values and technological needs. A modified VSD technique was used to develop a self-driven vehicle speed control algorithm for pedestrian crossings. The VSD iterations model the …
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A Structural Basis for Neuropathic Pain Syndromes Associated with Mutations in Nav1.7
… at residue 136 in the voltage- sensing domain (VSD) results in the disease, inherited erythromelalgia (IEM). From functional studies, it is clear that mutation at this residue results in increased Nav1.7 excitability, though the source of this hyperexcitability remains to be discovered. Here, we …
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Simulation of a power station's condensate pumping system in view of improving its efficiency
… the feasibility of a variable speed drive (VSD) retrofit. In order to develop this approach, a case study was conducted on an Eskom coal-fired power station – comparing different flow-control techniques with the aid of efficiency calculations, a simulated model, and an economic evaluation. …
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3-Phase gate-turn off thyristor inverter
… studied. A full 3-phase Variable Speed Drive (VSD) and its controller have been designed, constructed and tested. Gate Turn-Off Thyristors (GTO's) are used as the main switching elements in the Inverter stage of the Drive. The drive requirements of GTO's are studied in detail.
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The role of attention-deficit/hyperactivity disorder and parental misperceptions in risk for child physical abuse
… The framework includes a VoIP spam detector (VSD) that analyzes incoming VoIP calls for spam behavior using trust and reputation techniques. The framework also includes a nuisance detector (ND) that proactively infers the nuisance (or reluctance of the end user) to receive incoming calls. This …
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System and Methods for Detecting Unwanted Voice Calls
… The framework includes a VoIP spam detector (VSD) that analyzes incoming VoIP calls for spam behavior using trust and reputation techniques. The framework also includes a nuisance detector (ND) that proactively infers the nuisance (or reluctance of the end user) to receive incoming calls. This …
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Yap and Taz Are Required For Neural Crest-Derived Cardiovascular Development
… defects including ventricular septal defect (VSD), tetralogy of Fallot (TOF), double outlet right ventricle (DORV), and cardiac valve aberrations, varyingly between embryonic day (E) 14.5, E16.5, and E18.5. Cell apoptosis, proliferation, and smooth muscle differentiation were unchanged in …
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Modification of Aplysia Feeding Network By L-Dopa and Dopamine-Dependent Learning
… neurons. The large-scale voltage-sensitive dye (VSD) recordings delineated the spatial distribution of neurons active during BMPs and the modification of that distribution by the two concentrations of L-DOPA. Finally, a system was established for identifying neurons in VSD recordings which will …
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Effectiveness of smoke barriers: pressurised stair enclosures
… investigated; one with a Variable Speed Drive (VSD), System 1, typical of systems installed more recently and one without a VSD, System 2, typical of earlier types of SPS. The effectiveness evaluation was divided into two parts. The first considered the influence of variations to wind speed, …
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Third Quadrant Operation of 1.2-10 kV SiC Power MOSFETs
… body diode turn on at a source-to-drain voltage (VSD) much higher than the built-in potential of the pn junction. In 10 kV SiC MOSFETs, with the MOS channel on, the body diode does not turn on over the entire practical VSD range. As a result, the positive VGS leads to a completely unipolar …
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