• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 7
  • 2
  • 1
  • Tagged with
  • 11
  • 11
  • 3
  • 2
  • 2
  • 2
  • 2
  • 2
  • 2
  • 2
  • 2
  • 2
  • 2
  • 2
  • 2
  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Not Yet a Child of the Finite and the Infinite : Kierkegaardian Existentialism in William Golding’s Free Fall

Davén, Krister January 2009 (has links)
In William Golding’s Free Fall, the novel ends without its protagonist, Sammy Mountjoy, receiving the atonement he seeks. As a consequence, the novel ends in an unresolved manner, leaving Sammy in a state of suspension. Despite having a metaphysical awakening in a Nazi POW camp, the consequences of his enlightenment do not reflect the way the Sammy retrospectively narrates the tale of his life. The existentialist theories of Danish thinker and writer Søren Kierkegaard offer a solution to the dilemma. Kierkegaard’s theories concerning the aesthetic, ethical and religious spheres of life, as well as his concept of ‘existential dread’, may be used to show that Sammy is able to make a ‘leap of faith’ from the aesthetic to the ethical sphere. However, because of his inability to make the last leap into the metaphysical sphere of life, he does not attain the insight he needs, namely that he is ‘a child of the finite and infinite’. The essay relates the ways Sammy Mountjoy fits into the Sartrean and Kierkegaardian expressions of existentialism, soon moving on to describe the details of Kierkegaard’s thought concerning the three spheres of life and the concept of ‘dread’. Sammy’s preoccupation with the present, his focus on the exterior rather than the interior and his inability to commit himself to people or situations fit neatly into the criterion for the aesthetic sphere of life. This, in turn, leads him to a state of dread, which reaches its climax in the dark cupboard. When released from his imprisonment Sammy has reached a state of awareness concerning the “vital morality” between people, previously a foreign concept. However, Kierkegaard points out that also the ethical sphere is flawed, leaving the religious/metaphysical sphere as Sammy’s ultimate destination. By failing to make the final ‘leap of faith’, due to a misguided conception of the boundaries between the ethical and the Absolute, Sammy falls short of the resolution he desires and the forgiveness he seeks from the three people that have influenced him the most. Thus an explanation is proposed to the unresolved manner in which Free Fall ends.
2

Frifallslivbåtars begränsningar

Ellmark, Cyrille, Käck, Mathias January 2008 (has links)
Olyckor sker vid övning med frifallslivbåtar. Detta borde gå att arbeta bort med bättre utrustning och bättre utbildning. Eftersom olyckor inträffar oftare vid övning ombord i fartygen än vid övning iland borde den senare biten vara mer avgörande: Vid övningar bör vikt läggas vid hur man spänner fast sig på ett korrekt sätt. Ovanstående är en del av vad denna undersökande studie handlar om. Vi har använt en kvalitativ metod för att reda ut frågor om riskerna med frifallslivbåtar. SOLAS ställer inga krav på att det skall finnas hjälpmedel för att underlätta att ta med sig skadade personer i frifallslivbåtar. De tester som genomförts med människor ombord i frifallslivbåtar har bara skett när det råder gynnsamma förhållanden. Med tanke på att fartyg utsätts både för sjöhävning och att båtarna kan komma att landa i vågor borde SOLAS kraven höjas. De livbåtssystem vi har, varken testas eller övas med i vågor. Att frifallslivbåtar i tanken är ett väldigt bra koncept som livräddningsutrustning råder det inga tvivel om, men den borde utvecklas vidare. / Accidents occur when exercising with free-fall lifeboats. This should be possible to avoid with better equipment and better education. Since accidents occur more often when exercise is performed aboard ships than ashore, the later part should be more decisive: During exercise the focus should be put on how to buckle up in a correct way. The above text is a part of what this investigative study is about, we have used a qualitative method for sorting out questions about the risks with free-fall lifeboats. SOLAS does not put any demands on the existence of aiding equipment to facilitate bringing injured persons in a free-fall lifeboat. The tests that have been performed with people onboard free-fall lifeboats have only taken place during favourable conditions. Considering that ships are exposed to the motion of the sea and that the boat could land on a wave the SOLAS demands should be increased. The lifeboat systems we have, is neither tested nor practised with in waves. That free-fall lifeboats is a good concept as a lifesaving equipment, there is no doubt about, but it should be developed further.
3

Optimizing Mobile Phone Free Fall Drop Test Equipment - Precision, Repeatability, and Time Efficiency

Asadanin, Boris January 2009 (has links)
<p><!-- @page { size: 8.5in 11in; margin: 0.79in } P { margin-bottom: 0.08in } --></p><p>Free fall drop testing is an important part of the development of commercial electronic components and devices. In the process of optimizing the quality of their entire product range, Sony Ericsson Mobile Communications AB have decided to review their free fall drop test equipment with the goal of increasing the precision, repeatability, and time efficiency of their drop test applications. In regard to the free fall drop test principle a robot system with management software, named Doris Drop Test System, is developed to meet these goals.</p><p>As the amount of related work for this application is as minimal as the timeframes for this project, the development process is empirical and entrepreneurial with engineering skills as the governing line of work. Combining the competence from fields such as mechanics, electronics and product development, reaching the goals is successful enabling the identifying of two different drop methods – Impact Position and Drop Position. Increasing the repeatability from approximately 10% to 85% enables anyone at any time to perform the exact mobile phone drop test. By reaching a precision of up to 100%, performing free fall drop tests aiming for testing specific mobile phone parts, optimizes the development process by faster detection of mechanical weaknesses. Achieving these results in parallel with increasing the throughput by shortening the testing time, has proven the success of the Doris Drop Test System.</p><p> </p>
4

Not Yet a Child of the Finite and the Infinite : Kierkegaardian Existentialism in William Golding’s <em>Free Fall</em>

Davén, Krister January 2009 (has links)
<p>In William Golding’s Free Fall, the novel ends without its protagonist, Sammy Mountjoy, receiving the atonement he seeks. As a consequence, the novel ends in an unresolved manner, leaving Sammy in a state of suspension. Despite having a metaphysical awakening in a Nazi POW camp, the consequences of his enlightenment do not reflect the way the Sammy retrospectively narrates the tale of his life. The existentialist theories of Danish thinker and writer Søren Kierkegaard offer a solution to the dilemma. Kierkegaard’s theories concerning the aesthetic, ethical and religious spheres of life, as well as his concept of ‘existential dread’, may be used to show that Sammy is able to make a ‘leap of faith’ from the aesthetic to the ethical sphere. However, because of his inability to make the last leap into the metaphysical sphere of life, he does not attain the insight he needs, namely that he is ‘a child of the finite and infinite’. The essay relates the ways Sammy Mountjoy fits into the Sartrean and Kierkegaardian expressions of existentialism, soon moving on to describe the details of Kierkegaard’s thought concerning the three spheres of life and the concept of ‘dread’. Sammy’s preoccupation with the present, his focus on the exterior rather than the interior and his inability to commit himself to people or situations fit neatly into the criterion for the aesthetic sphere of life. This, in turn, leads him to a state of dread, which reaches its climax in the dark cupboard. When released from his imprisonment Sammy has reached a state of awareness concerning the “vital morality” between people, previously a foreign concept. However, Kierkegaard points out that also the ethical sphere is flawed, leaving the religious/metaphysical sphere as Sammy’s ultimate destination. By failing to make the final ‘leap of faith’, due to a misguided conception of the boundaries between the ethical and the Absolute, Sammy falls short of the resolution he desires and the forgiveness he seeks from the three people that have influenced him the most. Thus an explanation is proposed to the unresolved manner in which Free Fall ends.</p>
5

Frifallslivbåtars begränsningar

Ellmark, Cyrille, Käck, Mathias January 2008 (has links)
<p>Olyckor sker vid övning med frifallslivbåtar. Detta borde gå att arbeta bort med bättre utrustning och bättre utbildning. Eftersom olyckor inträffar oftare vid övning ombord i fartygen än vid övning iland borde den senare biten vara mer avgörande: Vid övningar bör vikt läggas vid hur man spänner fast sig på ett korrekt sätt. Ovanstående är en del av vad denna undersökande studie handlar om. Vi har använt en kvalitativ metod för att reda ut frågor om riskerna med frifallslivbåtar. SOLAS ställer inga krav på att det skall finnas hjälpmedel för att underlätta att ta med sig skadade personer i frifallslivbåtar. De tester som genomförts med människor ombord i frifallslivbåtar har bara skett när det råder gynnsamma förhållanden. Med tanke på att fartyg utsätts både för sjöhävning och att båtarna kan komma att landa i vågor borde SOLAS kraven höjas. De livbåtssystem vi har, varken testas eller övas med i vågor. Att frifallslivbåtar i tanken är ett väldigt bra koncept som livräddningsutrustning råder det inga tvivel om, men den borde utvecklas vidare.</p> / <p>Accidents occur when exercising with free-fall lifeboats. This should be possible to avoid with better equipment and better education. Since accidents occur more often when exercise is performed aboard ships than ashore, the later part should be more decisive: During exercise the focus should be put on how to buckle up in a correct way. The above text is a part of what this investigative study is about, we have used a qualitative method for sorting out questions about the risks with free-fall lifeboats. SOLAS does not put any demands on the existence of aiding equipment to facilitate bringing injured persons in a free-fall lifeboat. The tests that have been performed with people onboard free-fall lifeboats have only taken place during favourable conditions. Considering that ships are exposed to the motion of the sea and that the boat could land on a wave the SOLAS demands should be increased. The lifeboat systems we have, is neither tested nor practised with in waves. That free-fall lifeboats is a good concept as a lifesaving equipment, there is no doubt about, but it should be developed further.</p>
6

Optimizing Mobile Phone Free Fall Drop Test Equipment - Precision, Repeatability, and Time Efficiency

Asadanin, Boris January 2009 (has links)
<!-- @page { size: 8.5in 11in; margin: 0.79in } P { margin-bottom: 0.08in } --> Free fall drop testing is an important part of the development of commercial electronic components and devices. In the process of optimizing the quality of their entire product range, Sony Ericsson Mobile Communications AB have decided to review their free fall drop test equipment with the goal of increasing the precision, repeatability, and time efficiency of their drop test applications. In regard to the free fall drop test principle a robot system with management software, named Doris Drop Test System, is developed to meet these goals. As the amount of related work for this application is as minimal as the timeframes for this project, the development process is empirical and entrepreneurial with engineering skills as the governing line of work. Combining the competence from fields such as mechanics, electronics and product development, reaching the goals is successful enabling the identifying of two different drop methods – Impact Position and Drop Position. Increasing the repeatability from approximately 10% to 85% enables anyone at any time to perform the exact mobile phone drop test. By reaching a precision of up to 100%, performing free fall drop tests aiming for testing specific mobile phone parts, optimizes the development process by faster detection of mechanical weaknesses. Achieving these results in parallel with increasing the throughput by shortening the testing time, has proven the success of the Doris Drop Test System.
7

Advancement of Using Portable Free Fall Penetrometers for Geotechnical Site Characterization of Energetic Sandy Nearshore Areas

Albatal, Ali Hefdhallah Ali 24 April 2018 (has links)
Portable Free Fall Penetrometers (PFFPs) are lightweight tools used for rapid and economic characterization of surficial subaqueous sediments. PFFPs vary in weight, shape and size with options for using add-on units. The different configurations enable deployments in various environments and water depths, including the nearshore zone where conventional methods are challenged by energetic hydrodynamics and limited navigable depth. Moreover, PFFPs offer an opportunity to reduce the high site investigation costs associated with conventional offshore geotechnical site investigation methods. These costs are often a major obstacle for small projects serving remote communities or testing novel renewable energy harvesting machines. However, PFFPs still face issues regarding data analysis and interpretation, particularly in energetic sandy nearshore areas. This includes a lack of data and accepted analysis methods for such environments. Therefore, the goal of this research was to advance data interpretation and sediments characterization methods using PFFPs with emphasis on deployments in energetic nearshore environments. PFFP tests were conducted in the nearshore areas of: Yakutat Bay, AK; Cannon Beach, AK; and the U.S. Army Corps of Engineers' Field Research Facility's beach, Duck, NC. From the measurements, the research goal was addressed by: (1) introducing a methodology to create a regional sediment classification scheme utilizing the PFFP deceleration and pore pressure measurements, sediment traces on the probe upon retrieval, and previous literature; (2) investigating the effect of wave forcing on the sediments' behavior through correlating variations in sediment strength to wave climate, sandbar migration, and depth of closure, as well as identifying areas of significant sediment mobilization processes; and (3) estimating the relative density and friction angle of sand in energetic nearshore areas from PFFP measurements. For the latter, the field data was supported by vacuum triaxial tests and PFFP deployments under controlled laboratory conditions on sand samples prepared at different relative densities. The research outcomes address gaps in knowledge with regard to the limited studies available that investigate the sand geotechnical properties in energetic nearshore areas. More specifically, the research contributes to the understanding of surficial sediment geotechnical properties in energetic nearshore areas and the enhancement of sediment characterization and interpretation methods. / PHD
8

Etude numérique de la chute libre d'objets axisymétriques dans un fluide newtonien / Numerical study of axisymetric-bodies freely falling in Newtonian fluids

Chrust, Marcin 20 September 2012 (has links)
La mémoire présente une étude numérique des trajectoires non-verticales d’objets en chute ou en ascension libre dans un fluide newtonien initialement au repos. Une méthode numérique originale combinant une discrétisation spatiale spectrale et la décomposition du domaine a été implémentée à cet effet. Le code obtenu a été exploité pour apporter de nouvelles connaissances sur des objets fixes et objets libres. Pour les objet fixes, ellipsoïdes et cylindres, l’étude très complète des divers états de la transition a permis d’établir un lien entre le scénario de transition de la sphère et du disque infiniment mince. La simulation numérique d’objets libres a apporté des résultats très complets sur la chute de disques minces et de cylindres de faible épaisseur. Plusieurs questions soulevées dans les travaux précédents ont trouvés des réponses claires. Une étude paramétrique exhaustive, jamais abordée précédemment, portant sur des ellipsoïdes est décrite dans le dernier chapitre du mémoire. / The manuscript presents a numerical study of non-vertical trajectories of bodies fallingor rising freely in a Newtonian fluid initially at rest. The original numerical methodcombining a spectral spatial discretization and the decomposition of the domain wasimplemented. The developed code was used to study fixed and freely moving objects. Forthe fixed bodies, spheroids and cylinders, a very complete study of various transitionalregimes was carried out and established a link between the transition scenario of a sphereand of a disc. The numerical simulation of free bodies brought about the results onpath instabilities of discs and cylinders of small thickness. Several questions raised inprevious studies were clearly answered. An exhaustive parametric study, that has never beentaken up before, of freely moving spheroids is described in the last chapter of the manuscript.
9

Construção e testes de um penetrômetro de queda livre para caracterização do perfil de resistência ao cisalhamento de solos marinhos

Baldez, Anderson Lena January 2010 (has links)
Dissertação(mestrado) - Universidade Federal do Rio Grande, Programa de Pós-Graduação em Engenharia Oceânica, Escola de Engenharia, 2010. / Submitted by Lilian M. Silva (lilianmadeirasilva@hotmail.com) on 2013-04-15T00:06:33Z No. of bitstreams: 1 baldez,a.l.pdf: 8426528 bytes, checksum: 47e41efbe0e6ba9d1074f9667287d13a (MD5) / Approved for entry into archive by Bruna Vieira(bruninha_vieira@ibest.com.br) on 2013-06-10T18:46:55Z (GMT) No. of bitstreams: 1 baldez,a.l.pdf: 8426528 bytes, checksum: 47e41efbe0e6ba9d1074f9667287d13a (MD5) / Made available in DSpace on 2013-06-10T18:46:55Z (GMT). No. of bitstreams: 1 baldez,a.l.pdf: 8426528 bytes, checksum: 47e41efbe0e6ba9d1074f9667287d13a (MD5) Previous issue date: 2010 / Este trabalho tem por objetivo o desenvolvimento, construção e testes preliminares de um penetrômetro de queda livre para a caracterização de solos marinhos. O aparelho tem por finalidade medir as características de resistência do solo oceânico, através da medição e analise da desaceleração imposta ao penetrômetro após o seu impacto com o fundo. Este tipo de equipamento evita os elevados custos envolvidos em outros tipos de ensaios e na obtenção de amostras do fundo em condições de elevado risco e dificuldades naturais impostas pelas condições locais do mar. O dispositivo tem o formato de um aerofólio Joukowski simétrico (formato de gota), que consiste de duas partes: a primeira onde fica o acelerômetro e o chumbo granulado e a segunda onde há um conector que liga o acelerômetro a um cabo de dados e daí a um computador portátil que realiza a aquisição de dados. O penetrômetro pode ser lançado de certa altura acima da superfície da água, entra na água e mobiliza resistência hidrodinâmica durante a queda livre. Após choca-se contra o fundo marinho mobilizando resistências ao cisalhamento do solo sendo desacelerado até o repouso. Para os testes de funcionamento do equipamento foi utilizada a marina do Rio Grande Yacht Club localizado na cidade de Rio Grande - RS. Nos testes foram obtidos sinais de desaceleração registrados pelo acelerômetro que foram integrados numericamente duas vezes, a primeira obtendo dados de velocidade e na segunda dados de deslocamento percorrido pelo penetrômetro. Os dados assim coletados permitiram uma estimativa do perfil de resistência ao cisalhamento do solo marinho ao longo do comprimento penetrado,observando que o penetrômetro adquiriu a velocidade terminal sendo mensurada em torno de 5,7 m/s e o deslocamento máximo registrado obtido na marina foi de 5 metros. / This study aims at developing, constructing and testing a free fall penetrometer for the characterization of marine soils. The objective of this device is to measure the strength characteristics of the marine soil, through the measurement and the analysis of the deceleration imposed by its impact on the bottom.This kind of equipment reduces high costs involved in other tests and in the collection ofsamples on the bottom under bad sea conditions regarding risks and natural obstacles. The device was shaped as a symmetric Joukowski airfoil (the shape of a drop) which consists of two parts: one of them holds the accelerometer and the granulated lead and the other one has a connector that links the accelerometer to a data cable, and then, to a portable computer which collects the data. The penetrometer can be launched from a certain height above the water surface, and then penetrates into the water and mobilizes hydrodynamic resistance during the free fall. When it hits the bottom of the sea, it mobilizes shear strength and decelerates until it rests. The tests with the equipment were carried out in the marina at the Rio Grande Yacht Club located in Rio Grande, RS, Brazil. The tests got deceleration signals which wererecorded by the accelerometer and were integrated twice numerically in order to collectdata on the velocity and on the displacement of the penetrometer. These data enabled the estimate of the shear strength profile of the marine soil along the length in which penetration occurred. The datashow that the velocity of the penetrometer reached about 5.7 m/s and thatthe maximum displacement recorded in the marina was 5 meters.
10

Instabilités de trajectoires de sphères, ellipsoïdes et bulles / Path instabilities of spheres, spheroids and bubbles

Zhou, Wei 29 September 2016 (has links)
La thèse présente une étude numérique des instabilités de trajectoires de sphères, d'ellipsoïdes aplatis et de bulles en mouvement libre sous l'action de la gravité, de la poussée d'Archimède et des forces hydrodynamiques. Le chapitre sur les sphères reprend, complète et étend l'étude numérique de Jenny et al. (2004) en se concentrant sur la transition au chaos et sur les trajectoires chaotiques. Les résultats montrent la différence entre le scénario de transition au chaos de sphères de faible et de grand rapport de densité. Plusieurs grandeurs statistiques sont proposées afin de fournir une caractérisation quantitative des états chaotiques. Elle permettent de mettre en relation les états ordonnées et chaotiques et offrent une possibilité de comparaison objective de données aléatoires d'origine numérique ou expérimentale. L'étude, très extensive, du comportement d'ellipsoïdes aplatis établit le lien entre les disques et les sphères en faisant varier l'aplatissement des objets depuis infiniment plat jusqu'à presque sphérique. Les huit diagrammes d'état présentés permettent de comprendre l'effet de la forme des ellipsoïdes sur le scénario de transition. Le cas d'ellipsoïdes presque sphériques montre que de faibles imperfections de la forme peuvent avoir in impact significatif sur les trajectoires de sphères de très faible rapport de densité. Pour les bulles considérées dans la limite de rapport de densité et viscosité az/liquide nul, l'étude se concentre sur l'analyse de stabilité linéaire et aboutit à la courbe de stabilité marginale dans le plan des paramètres nombre de Bond – nombre de Galilée en tenant compte de la déformation des bulles au moment de la perte de leur axisymétrie. Plus deux décades de nombres de Bond, entre 0,1 et 20, sont couvertes. Les résultats montrent clairement l'effet de la déformation de la bulle sur le seuil de l'instabilité. / The thesis presents a numerical study of path instabilities for spheres, oblate spheroids and bubbles moving freely under the effect of the gravity, buoyancy and hydrodynamic forces. For spheres, the parametric study of Jenny et al. (2004) is revisited, improved end extended with a special focus on the chaotic states. The results reveal that the effect of density ratio responsible for different oblique oscillating states of low and high frequencies has a significant impact both on the onset of chaos and on the behavior of fully chaotic states. Several quantitative statistical quantities are proposed and shown to be relevant for establishing the relation between chaotic and ordered states and for an objective comparison of random data of numerical or experimental origin. The extensive study on freely moving spheroids establishes the link between disks and spheres by varying the aspect ratio of spheroids from infinitely flat to almost spherical. The state diagrams provided for eight different aspect ratios of spheroid show in detail how the transition scenario varies depending of the body shape. The investigation of almost spherical spheroids reveals the specificities of the dynamics of light imperfect spheres.For the deformable gas bubble in the limit of zero gas/liquid density and viscosity ratio, a marginal stability curve is given in the two-parameter plane of the Galileo and the Bond number indicating the critical Galileo numbers for the loss of stability of vertical trajectories. The numerical investigation covers more than two decades of Bond number going from 0.1 to 20. The results clearly show the crucial role of the surface deformation.

Page generated in 0.1005 seconds