Essays about: "arcs"

Showing result 1 - 5 of 36 essays containing the word arcs.

1. 1. Analysis of high-voltage low-current DC/DC converters for electrohydrodynamic pumps

   University essay from Uppsala universitet/Institutionen för elektroteknik

   Author : Sigge Axelsson; Jonas Gartner; Axel Stafström; [2023]
   Keywords : high-voltage; low-current; low-power; DC DC; DC-DC; high-gain; converter; electrohydrodynamic pump; EHD; transformerless converter; Royer-based converter; resonant Royer oscillator; Cockroft-Walton voltage multiplier; CWVM; voltage multiplier; series-connected positive-negative voltage multiplier; SPNVM; planar air-core transformer; planar transformer; high-freqency Royer-based converter; overcurrent protection; LT8331; gallium nitride; GaN; planar PCB-integrated transformers;

   Abstract : Moving parts cause vibrations and tend to wear out. In applications where maintenance is complicated, solutions without moving parts are therefore advantageous. Electrohydrodynamic pumps are such a solution. Instead of mechanical propulsion, they use strong electric fields to induce movement in a dielectric cooling liquid. READ MORE

3. 2. "I'm not forcing anyone" : A Study on Motivation and Willingness to Communicate in English in a Swedish Upper-Secondary School Context

   University essay from Mälardalens universitet/Akademin för utbildning, kultur och kommunikation

   Author : Ylva Craig; [2023]
   Keywords : English as a second language; second language learning; willingness to communicate; motivation; integrativeness; upper-secondary school; Sweden; ARCS model;

   Abstract : This study aims to expand on the existing knowledge of Swedish upper-secondary students’ willingness to communicate (WTC) in English and provide insight into how motivational strategies are used in some Swedish English-as-a-second-language (ESL) classrooms by the teachers. To gather data, four teachers were interviewed, and three of them observed in class, and 67 students answered a questionnaire. READ MORE

4. 3. Friezes, Triangulations, and Trees

   University essay from Lunds universitet/Matematik LTH; Lunds universitet/Matematik (naturvetenskapliga fakulteten); Lunds universitet/Matematikcentrum

   Author : Yijia Zeng; [2023]
   Keywords : Frieze pattern; polygon triangulation; binary tree; Catalan numbers; Mathematics and Statistics;

   Abstract : In this thesis, we focus on these three classes of objects: frieze patterns, polygon triangulations, and planar binary rooted trees. After proving that these objects are in pairwise bijective correspondence with each other, we introduce Catalan numbers through Dyck paths and prove that all these objects are Catalan objects. READ MORE

5. 4. Cusp Aurora Appearing at the Dayside tip of Transpolar Arcs - Dependence on IMF and Dipole Tilt

   University essay from KTH/Skolan för elektroteknik och datavetenskap (EECS)

   Author : Cecilie Holmen; Mattias Wang; [2023]
   Keywords : ;

   Abstract : The aurora is a direct consequence of the Earth’s magnetic field interaction withthe solar wind and the interplanetary magnetic field (IMF). In this study, we examine thelocation of the cusp aurora when accompanied by transpolar arcs (TPAs) with the goal to finda dependence on the IMF. READ MORE

6. 5. Tests of Series Arcing and Arc Fault Detection Devices in Low Voltage Systems

   University essay from KTH/Skolan för elektroteknik och datavetenskap (EECS)

   Author : Ghazal Al Qabbani; [2021]
   Keywords : ;

   Abstract : Unwanted electrical arcs are a concern in fire and electrical equipment safety. Arcs in electrical systems can be categorized into two main groups, traditionally called: Series and parallel arc faults, or more recently called low current and high current arc faults. READ MORE