6 research outputs found
Multifunctional Converter Drive for Automotive Electric Power Steering Systems
No full textIn this thesis it is shown that in the case of an automotive electric power steering system, critical pulse power loads can be decoupled from the power net with a storage element and a multifunctional converter. A multifunctional converter system is proposed because it uses the motor drive system as a dc-dc converter and hence no additional front-end dc-dc converter is required. The influence of a multifunctional converter to the torque and losses in induction and PM synchronous machines were analyzed and design guidelines developed. This was necessary because of the fixed star-point connection and the superimposed dc phase currents in a multifunctional converter system. It was shown with analytical models and FEM simulations verified with measurements on induction and PM synchronous machines that the winding scheme has to be carefully selected to avoid partial saturation, braking torque and increased torque ripple. With the presented design improvements, consisting of interleaved pulse-width modulation and winding arrangements, the high-frequency ripple currents were significantly reduced. A further benefit of a multifunctional converter is that three-phase electrical machines can be operated with only two active phases to increase the reliability.EPPElectrical Engineering, Mathematics and Computer Scienc
Macromolecular Engineering: From Precise Macromolecular Inks to 3D Printed Microstructures [data]
No full textMacromolecules with complex, defined structures exist in nature but rarely is this degree of control afforded in synthetic macromolecules. Sequence-defined approaches provide a solution for precise control of the primary macromolecular structure. Despite a growing interest, very few examples for applications of sequence-defined macromolecules exist. In particular, the use of sequence-defined macromolecules as printable materials remains unexplored. Herein, the rational design of precise macromolecular inks for 3D microprinting is investigated for the first time. Specifically, three printable oligomers are synthesized, consisting of eight units, either crosslinkable (C) or non-functional (B) with varied sequence (BCBCBCBC, alternating; BBCCCBB, triblock; and BBBBCCCC, block). The oligomers are printed using two-photon laser printing and characterized. It is clearly demonstrated that the macromolecular sequence, specifically the positioning of the crosslinkable group, plays a critical role in both the printability and final properties of the printed material. Thus, through precise design and printability of sequence-defined macromolecules, an exciting avenue for the next generation of functional materials for 3D printing is created
Macromolecular Engineering: From Precise Macromolecular Inks to 3D Printed Microstructures
No full textMacromolecules with complex, defined structures exist in nature but rarely is this degree of control afforded in synthetic macromolecules. Sequence-defined approaches provide a solution for precise control of the primary macromolecular structure. Despite a growing interest, very few examples for applications of sequence-defined macromolecules exist. In particular, the use of sequence-defined macromolecules as printable materials remains unexplored. Herein, the rational design of precise macromolecular inks for 3D microprinting is investigated for the first time. Specifically, three printable oligomers are synthesized, consisting of eight units, either crosslinkable (C) or non-functional (B) with varied sequence (BCBCBCBC, alternating; BBCCCBB, triblock; and BBBBCCCC, block). The oligomers are printed using two-photon laser printing and characterized. It is clearly demonstrated that the macromolecular sequence, specifically the positioning of the crosslinkable group, plays a critical role in both the printability and final properties of the printed material. Thus, through precise design and printability of sequence-defined macromolecules, an exciting avenue for the next generation of functional materials for 3D printing is created
Dynamic Models of Religious Conformity and Conversion: Theory and Calibrations
Get PDFThis paper develops behavioral and deterministic overlapping generations models to explain and simulate changes in the proportion of secular and religious people. Under the behavioral approach, the role of the church is to generate an externality associated with the investment in enhancing the conformity rate among young believers. Under the deterministic approach, changes in the number of nonbelievers are explained by different birth rates among secular and religious parents as well as the relative proportion of nonconformists among the young in each group. This model is then used to calibrate for (non)conformity rates among secular and religious people. ZUSAMMENFASSUNG - (Dynamische Modelle religiöser Konformität und Konversion: Theorie und Simulationen) Diese Arbeit entwickelt deterministische und Verhaltensmodelle mit überlappenden Generationen, welche die Veränderungen des Zahlenverhältnisses von nicht religiösen zu religiösen Menschen erklären und simulieren. Im Verhaltensansatz wird aufgezeigt, dass der Kirche die Aufgabe zukommt, einen externen Effekt zu erzeugen, der dafür sorgt, dass junge Gläubige mit der Glaubenseinstellung ihrer Eltern konform gehen. Der deterministische Ansatz erklärt die Veränderungen in der Anzahl Nichtgläubiger einerseits mit den unterschiedlichen Geburtenraten unter nichtgläubigen Eltern im Vergleich zu religiösen Eltern und andererseits durch den relativen Anteil von Nichtkonformen unter der jungen Generation in jeder Gruppe. Dieses Modell wird verwandt, um (Nicht-)Konformitätsraten--nach denen junge Menschen ihren Eltern im Glauben folgen oder nicht--innerhalb der Gruppen weltlicher sowie religiöser Menschen zu berechnen.Conversion, Religious conformity, Role of the Church, Nonconformity, Nonreligious people, Religious Affiliation, Parents’ education, Believers, Nonbelievers.
Book Reviews
Get PDFThe Tempest of Clemenza (Glenda Adams) (Reviewed by Lisa Altomari, Vermont Technical College) Leaning towards Infinity (Sue Woolfe) (Reviewed by Jane Emery, Stanford University) The Cross (Mandy Sayer) (Reviewed by Michael E. Pippenger, Indiana University) Billy Sunday (Rod Jones) (Reviewed by David Callahan, University of Aveiro, Portugal) 1988 (Andrew McGahan) (Reviewed by Darren DeFrain, Western Michigan University) Loaded (Christos Tsiolkas) (Reviewed by Dmetri Kakmi, Williamstown, Victoria) Night Surfing (Fiona Capp) (Reviewed by Mary-Robyn Adams, University of North Carolina at Greensboro Cassandra (Kerry Greenwood) (Reviewed by Gina Luria Walker, New School for Social Research) Wish (Peter Goldsworthy) (Reviewed by Frank Parigi, University of Arkansas) A Change in the Lighting (Amy Witting) (Reviewed by Joan Slagle, Philadelphia) Bulmurn: A Swan River Nyoongar (Richard Wilkes)(Reviewed by Richard Carr, University of Alaska, Fairbanks) Birds Beasts Flowers (William Hart-Smith) (Reviewed by Lyn Jacobs, Flinders University of South Australia) The City of Home (Thomas Shapcott) (Reviewed by Herbert C. Jaffa, New York University) Eating the Sun (Lawrence Bourke) and The Cave after Saltwater Tide (David P. Welter) (Reviewed by D\u27Arcy Randall, University of Texas at Austin) Things Happen (Philip Hodgins) and The Honeymoon Snaps (John Foulcher) (Reviewed by Mike Wiley, DePaul University) Australian Poetry: Romanticism and Negativity (Paul Kane) (Reviewed by Nicholas Birns, New School for Social Research) Patrick White (Simon During) (Reviewed by Carolyn Bliss, University of Utah) Australia\u27s Changing Landscapes (Susan Ballyn, Doireann MacDermott, Kathleen Firth, editors) (Reviewed by Horst Priessnitz, Wuppertal University - Germany) and that\u27s final. (Dean Kiley) (Reviewed by Felicity Plunkett, University of Tasmania) Concert of Voices - An Anthology of World Writing in English (Victor J. Ramraj, Editor) and Ethnic Literature and Culture in the U.S.A., Canada and Australia (Igor Maver, Editor) (Reviewed by Robert Ross, University of Texas at Austin) M. Barnard Eldershaw (Maryanne Dever, Editor) (Reviewed by Marian Arkin, City University of New York, LaGuardia) Dear Sun: The Letters of Joy Hester and Sunday Reed (Janine Burke, Editor) (Reviewed by Catherine Miner, Boston) A Federal Republic: Australia\u27s Constitutional System of Government (Brian Galligan) (Reviewed by Robert Cushing, University of Texas at Austin) A Death in the Tiwi Islands: Conflict, Ritual and Social Life in an Australian Aboriginal Community (Eric Venbrux) (Reviewed by Marilyn Strelau, Simsbury High School, Connecticut) The Scent of Power: On the Trail of Women and Power in Australian Politics (Susan Mitchell) (Reviewed by Donna Coates, University of Calgary) Redemption Songs: A Life of Te Kooti Arikirangi Te Turuki (Judith Binney) (Reviewed by Juniper Ellis, Vanderbilt University) In Search of Steeple Rudd: Author of the Classic Dad & Dave Stories (Richard Fotheringham) (Reviewed by Murray S. Martin, Windsor Locks, Connecticut) An All Consuming Passion: Origins (William J. Lines) (Reviewed by Robert Zeller, Southeast Missouri State University) Rosa: A Biography of Rosa Townsend (Beryl Hackner) (Reviewed by Anne Pender, Australian Defence Force Academy
Technical education and the London county council 1918-1939. A study in course innovation and development
No full textThis thesis was submitted for the degree of Doctor of Philosophy and awarded by Brunel University.Our thesis is concerned with the process of course innovation and Development in technical education within the area of the London County Council During the period 1918-39. Although essential, an historical study, the Thesis is intended to be of value in a consideration of future development in Technical education, and in particular in the study of the relationship between Curriculum management and manpower planning. The first part of our thesis describes the institutional structure of the principal sectors of technical education in London and outlines the Type of courses that were available and their general progress during the Interwar years. The second part of our thesis seeks to analyse the background to course innovation and to assess why certain courses were successful and why others were comparative failures. Since the topic is potentially so vast, our thesis has been limited to an identification of major factors, rather than a detailed consideration of each one. Our analysis shows the process of course innovation and development in technical education to have been a highly complex interaction of forces in which the other aspects of the educational structure, including administrative as well as teach1ng institutions, played a vital role. Emphasis has been given to the influence of senior administrative officers within the local I education authority framework. Special mention has been made of the work of the Board of Education and of the limitations of the Board in tailing to establish definite guidelines for course development in technical education. Important factors outside the educational structure have also been considered, including the attitudes of parents and business management to formal technical training
