Global ETD Search

11	Lightweight elevator : A portable elevator capable of climbing rooftops / Lättviktshiss Malmström, Tore, Göransson, Carl January 2021 (has links) The purpose of this project is to design and construct a portable lightweight elevator for transportation of goods to rooftops. The elevator should be easy to transport, assemble and disassemble, it should also be useful at various heights and for a wide range of roof inclinations. The elevator contains a railway consisting of four separable modules. A carriage rides the railway and is pulled to the top with a winch powered by a DC-motor. The carriage starts and stops using a Rocker switch and a Hall sensor that detects magnets placed at the end and beginning of the railway. After performing tests with the elevator the conclusion is that the elevator is practical to assemble and transport, but the carriage derails too easily when the railway has angular changes. / Målet med projektet är att designa och konstruera en portabellättviktshiss som kan transportera gods från marknivå till hustak. Den ska vara lätt att transportera och att montera ner och upp, den ska också gå att anvåanda för olika höjder och på hus med olika taklutningar. Hissen består av en räls som går att ta isär i fyra olika delar. En vagn åker på fyra hjul uppför rälsen och lyftkraften kommerfrån en vinsch som drivs av en likströmsmotor. Vagnen kan starta och stanna med hjälp av en knapp, den stannar även automatisk då en hallsensor på vagnen känner av magneter som är placerade vid början och slutet av rälsen. En arduino Uno skickar signaler mellan de elektriska komponenterna och motorn får ström via en H-brygga, vilket gör att den kan rotera i båda riktningarna. Efter att hissen testats kan det konstateras att konstruktionen är enkel att bygga ihop och smidig att fästa vid olikavinklar och höjder. Däremot spårar vagnen ofta ur då hissen körs med för branta vinklar mellan de olika delarna av rälsen. Mechatronics elevator winch Arduino DCmotor Hall sensor H-bridge Mekatronik hiss vinsch Arduino Likstr¨omsmotor Hall sensor H-brygga Mechanical Engineering Maskinteknik
12	On reasons and disagreement in ethics Gaff, Andrew Douglas January 2007 (has links) This thesis explores reasons and disagreement in ethics, and their connection to personal identity. I begin by arguing that reasons are open; what gives them direction is how they feature in my life and weigh with me. Of course, this does not tell us what reasons are available to a person when they act. In this connection I argue against Bernard Williams’ internal reasons thesis, showing that there are occasions when we will want to say someone has a reason to act even though they are unable to see it. Continuing with Williams, I explore moral necessity, drawing also on the works of Winch, Rhees and Cordner, arguing that Williams too readily conflates psychological with ethical limits. In particular, the possibility of recanting what we took to be necessary should inform our view of moral necessity, since it can show that I had misconstrued the nature of the limits I took myself to have reached. Following this use of recantation, I explore narrative in detail, arguing that my narrative is partly constitutive of who I am. My agency is therefore interpretive. This has ramifications for thinkers such as Christine Korsgaard and Jonathan Dancy, whose work I explore in two excursuses. In different ways, both fail to appreciate the significance of our interpretive identities.
13	Tingens lydnad och människans väntan : Nödvändighet, nåd, handling och tänkande i Simone Weils filosofi / The obedience of things and the waiting of man : Necessity, grace, action and thinking in Simone Weils philosophy Christola, Victor January 2017 (has links) This bachelor thesis engages in a quest to understand the concepts of necessity and grace in Simone Weils thinking. The question in play, in which many more questions lie hidden, reads as follows: How does Weil understand the operations of grace in relation to the ”blind necessity” of the natural world, and what are the philosophical implications of this concept of grace? What are, for instance, given her understanding of the world as God’s creation, the metaphysical grounds for a basic human activitiy such as thinking or reflexion? A reading of Simone Weils works on necessity, grace, affliction and attention is contrasted with her thoughts on science, method and truth. The concept of necessity is compared to the one of Spinoza, especially on the subject of how the good or the just relates to the true and the necessary: it shows there are interesting similarities and illuminating differences between the two philosophers’ lines of thought. Here, the concept of attention becomes central to the image: the idea of a cultivated mode of reception of the world and of the Other. Attention is analogously understood as a method of prayer and a cultivated ethical attitude towards other human beings – and an ideal scientific state of mind. In the final chapter of the analytic part of the composition, Weils concept of grace is investigated in regard to concepts of thinking and understanding. Here, Leibniz idea of the divine world and the divine mind plays a concise but important role on the matter of a tentative metaphysical grounding of thinking as such – how this can be thought and how it reflects and deepens Simone Weils metaphysics, especially her understanding of the highest states of insight into the nature of the world as partly a work of divine grace. In the last chapter Walter Benjamins vision of the coming philosophy as a consolidation between Immanuel Kants transcendental philosophy and religious experience – and religious thought – show the way for further investigation into the field, a field that the thesis has outlined at the same time as it has attempted to answer some specific questions that seems to be the most urgent ones. Weil Simone Weil nödvändighet nåd handling tänkande amor fati uppmärksamhet kärlek rättvisa etik moral epistemologi vetenskapsteori vetenskap empiri deduktion analogi matematik ödet tyngden tyngdlagen insikt styrka Homeros Galilei Newton Spinoza Winch Leibniz Nietzsche Cockburn Kate Larson Rhees Herakleitos Parmenides Lacan Boethius Jesus Platon Walter Benjamin Philosophy Filosofi
14	The alternative vote in British Columbia: values debates and party politics Harrison, Stephen J. 04 August 2010 (has links) This thesis provides a detailed account of the introduction, use, and repeal of the alternative vote (AV) in British Columbia in the 1950s. It argues that British Columbians, familiar with polarized, two-party politics, were dismissive of majority representation. Conversely, the public expressed a strong preference for local representation during discussions of redistribution. While the Liberal and Conservative Coalition parties introduced AV to keep the Co-operative Commonwealth Federation from forming a government, party members were often stronger proponents of electoral reform than their leaders. Nevertheless, the system was debated in terms of democratic values. This was true of electoral reform debates across Canada, including federal debates on proportional representation. Contrary to histories that focus solely on the 1952 and 1953 AV elections and W.A.C. Bennett and Social Credit, this project traces the origins of the alternative vote in BC from the 1940s forward, including ongoing discussions of the single transferable vote (STV) and a points system. The history of BC’s provincial party system in the twentieth century is included in order to establish how polarized politics affected British Columbians’ attachment to the idea of local representation. This thesis contends that the public’s preference for plurality voting contributed to its dismissal of AV: even those who ranked multiple candidates did not necessarily endorse the system. This project also looks at the alternative vote debates in the 1970s and redistribution commissions in BC, particularly the 1978 Eckardt Commission, in order to better understand British Columbians’ attachment to local representation and first-past-the-post, and their dismissal of a preferential system that encouraged them to rank candidates. Social Credit favoured regional representation over representation by population during the redistribution process, and the theme of local representation has consistently framed discussions of electoral reform in British Columbia, including the 2004 BC Citizens’ Assembly’s STV proposal. British Columbia Alternative Vote Single Transferable Vote Electoral Reform Redistribution Representation Democratic Values Coalition CCF Social Credit Byron Johnson Harold Winch W.A.C. Bennett Eckardt Commission Canada Proportional Representation AV STV Local Representation Majority Representation Redistricting
15	Разработка новых конструкций реверсивных шестеренных насосов для систем смазки возвратно-вращательных механизмов экскаваторов : магистерская диссертация / Development of new designs of reversible gear pumps for lubrication systems of return-rotational mechanisms of excavators Чибиров, А. Б., Chibirov, A. B. January 2019 (has links) Диссертация на тему «Разработка новых конструкций реверсивных шестеренных насосов для систем смазки возвратно-вращательных механизмов экскаваторов» содержит 95 страниц текста, рисунков – 49, формул – 22, использованных источников – 18, иллюстрационный альбом, включающий 15 листов формата А1 графической части. Ключевые слова: системы смазки, реверсивные механизмы, реверсивный насос, шестеренный насос, консистентная смазка, циркуляционная смазка, карьерные экскаваторы, привод поворота, привод подъемной лебедки. Предмет исследования: проблемы систем смазки современных карьерных экскаваторов. Цель работы: разработка схемы и конструкции насоса, обеспечивающего бесперебойную подачу смазывающего вещества при постоянном реверсировании его ведущего вала. Итогом работы является разработка двух концептуальных вариантов шестеренного реверсивного насоса для узлов, совершающих возвратно-вращательные движений. Насосы могут работать от основного привода, без использования дополнительного двигателя. Так же в работе представлен пример использования данных насосов в узлах карьерного экскаватора ЭКГ-20, таких как редуктор подъемной лебедки и редуктор привода поворота с расчетом параметров насоса для последнего. В процессе работы над диссертацией была оформлена заявка на патент на полезную модель «Реверсивный шестеренный насос». Заявка зарегистрирована в Роспатенте с приоритетом от 23.04.2019. Регистрационный номер заявки 2019112339. / The dissertation on the theme "Development of new designs of reversible gear pumps for lubrication systems of return-rotational mechanisms of excavators" contains 95 pages of text, figures – 49, formulas – 22, used sources – 18, an illustrative album, including 15 sheets of A1 format of the graphic part. Key words: lubrication system, reversing mechanisms, a reversible pump, gear pump, grease lubrication, circulating lubrication, mining shovels, swing drive, the drive of the lifting winch. Subject of research: problems of lubrication systems of modern mining excavators. The purpose of the work: development of the scheme and design of the pump, ensuring uninterrupted supply of lubricant with constant reversal of its drive shaft. The result of the work is the development of two conceptual variants of the gear reversible pump for units performing reciprocating movements. Pumps can operate from the main drive, without the use of an additional engine. Also the paper presents an example of the use of these pumps at the nodes of a mining shovel EKG-20, such as reducer lift winch, and the gear drive rotation calculation of pump parameters for the latter. In the process of working on the thesis was issued a patent application for a utility model "Reversible gear pump". Application to patent with priority of 23.04.2019. Registration number of the application 2019112339. The practical usefulness of the work lies in the fact that this pump is ready for use in many areas of engineering, as shown by the example of mining equipment. MASTER'S THESIS LUBRICATION SYSTEM REVERSING MECHANISMS A REVERSIBLE PUMP GEAR PUMP GREASE LUBRICATION CIRCULATING LUBRICATION MINING SHOVELS SWING DRIVE THE DRIVE OF THE LIFTING WINCH СИСТЕМЫ СМАЗКИ РЕВЕРСИВНЫЙ НАСОС ШЕСТЕРЕННЫЙ НАСОС КОНСИСТЕНТНАЯ СМАЗКА ПРИВОД ПОВОРОТА

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