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  • 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.
211

Design of twin E plane sectoral horns for power division

Brokaw, Wendell A. 01 April 2003 (has links)
No description available.
212

Second order cascading effect in LiNbO3 waveguide devices and applications

Fang, Hui 01 July 2000 (has links)
No description available.
213

Place identity, guides, and sustainable tourism in Canada's Yukon Territory

de la Barre, Suzanne 11 1900 (has links)
The following is a qualitative exploration of place identity, wilderness and cultural tourism interpreter guides, and sustainable tourism development in Canada’s Yukon Territory. Four research sub-questions are used to glean insights and advance this study: 1) how are Yukon place identities characterized in relation to remoteness?; 2) how is Yukon tourism positioned in relation to these place identities of remoteness?; 3) how is remoteness reflected in the place identities of wilderness and cultural tourism interpreter guides?; and 4) how do the place identities of wilderness and cultural interpreter guides influence the way they design and deliver their tourism activities? Recognizing the importance of “sense of place” as a tourism development tool, cultural geography was used to analyse guide place identity in relation to place-making and place-marketing processes. The study involved textual analysis of resident and tourist oriented documents, participant observation of guides and their tourism activities, and an analysis of place identity narratives identified in interviews with wilderness and cultural tourism guides. Three collective place identity narratives were used as a framework to examine place relationships in a tourism context: 1) Masculinist Narratives, 2) Narratives of the New Sublime, and 3) Narratives of Loss. In this study, place identity is explored in terms of the way it is expressed through, and influenced by, notions of “remoteness.” Remoteness is conceptualized as a social, cultural, historical and geographical construct that holds meaningful – if differently experienced and expressed – place identity values for residents and tourists alike. Remoteness is defined by the Yukon’s vast wilderness, its distance [real and perceived] from southern Canada and “civilization,” and its unique cultural makeup and history, especially with regard to lingering notions of an untamed frontier and its First Nations residents. Findings discuss infrastructure as a pivotal paradox; one that hinges on the “remote-accessible” nature of the Yukon’s tourism development question. Relationships between guide place identity, tourism experience authenticity and the nature of interpretation, type of tourism operation and tourism experience are identified and considered in relation to special interest tourism. Finally, implications for tourism and destination management and the goals of sustainable tourism development are discussed. / Tourism
214

Top hat and cane show : gendered emotional labour in kayak guiding

Sharpe, Carlin R January 2012 (has links)
This thesis interrogates the intersections of gender and emotional labour in an exploratory study of guided kayak tours. The kayak tour is a socially produced location where guides hold the double role of entertainer and protector of their clients. The social space of the tour not only constructs and markets to particular clients (which impact guide-clients interactions), but also constructs particular gender locations for guides. Semi-structured, open-ended interviews were conducted to produce rich qualitative data, and were supplemented by fieldwork and examination of promotional materials. Guides’ stories offer detailed accounts of the emotional labour in which they engage as they produce a tour experience for clients. They also reveal the ways in which this labour is intertwined with their gender projects. As kayaking is unexamined within sociological literature, this thesis contributes to an understanding of the social world and furthers knowledge on the complexities of gender and emotional labour. / viii, 112 leaves ; 29 cm
215

Place identity, guides, and sustainable tourism in Canada's Yukon Territory

de la Barre, Suzanne Unknown Date
No description available.
216

Vector finite element methods for spurious-free solutions of unbounded dielectric and ferrite loaded waveguiding structures

Crain, Bruce Richard 05 1900 (has links)
No description available.
217

Analysis of linear and nonlinear coupled dielectric waveguides /

Chang, Hosung. January 1993 (has links)
Thesis (Ph. D.)--Oregon State University, 1993. / Typescript (photocopy). Includes bibliographical references (leaves 102-110). Also available on the World Wide Web.
218

Perforated Mach-Zehnder interferometer evanescent field sensor in silicon-on-insulator /

Yadav, Ksenia. January 1900 (has links)
Thesis (M.App.Sc.) - Carleton University, 2006. / Includes bibliographical references (p. 85-91). Also available in electronic format on the Internet.
219

Free-carrier effects in polycrystalline silicon-on-insulator photonic devices /

Ogah, Oshoriamhe F. January 2010 (has links)
Typescript. Includes bibliographical references.
220

Intuitive, iterative and assisted virtual guides programming for human-robot comanipulation / Programmation intuitive, itérative et assistée de guides virtuels pour la comanipulation homme-robot

Sanchez Restrepo, Susana 01 February 2018 (has links)
Pendant très longtemps, l'automatisation a été assujettie à l'usage de robots industriels traditionnels placés dans des cages et programmés pour répéter des tâches plus ou moins complexes au maximum de leur vitesse et de leur précision. Cette automatisation, dite rigide, possède deux inconvénients majeurs : elle est chronophage dû aux contraintes contextuelles applicatives et proscrit la présence humaine. Il existe désormais une nouvelle génération de robots avec des systèmes moins encombrants, peu coûteux et plus flexibles. De par leur structure et leurs modes de fonctionnement ils sont intrinsèquement sûrs ce qui leurs permettent de travailler main dans la main avec les humains. Dans ces nouveaux espaces de travail collaboratifs, l'homme peut être inclus dans la boucle comme un agent décisionnel actif. En tant qu'instructeur ou collaborateur il peut influencer le processus décisionnel du robot : on parle de robots collaboratifs (ou cobots). Dans ce nouveau contexte, nous faisons usage de guides virtuels. Ils permettent aux cobots de soulager les efforts physiques et la charge cognitive des opérateurs. Cependant, la définition d'un guide virtuel nécessite souvent une expertise et une modélisation précise de la tâche. Cela restreint leur utilité aux scénarios à contraintes fixes. Pour palier ce problème et améliorer la flexibilité de la programmation du guide virtuel, cette thèse présente une nouvelle approche par démonstration : nous faisons usage de l'apprentissage kinesthésique de façon itérative et construisons le guide virtuel avec une spline 6D. Grâce à cette approche, l'opérateur peut modifier itérativement les guides tout en gardant leur assistance. Cela permet de rendre le processus plus intuitif et naturel ainsi que de réduire la pénibilité. La modification locale d'un guide virtuel en trajectoire est possible par interaction physique avec le robot. L'utilisateur peut déplacer un point clé cartésien ou modifier une portion entière du guide avec une nouvelle démonstration partielle. Nous avons également étendu notre approche aux guides virtuels 6D, où les splines en déplacement sont définies via une interpolation Akima (pour la translation) et une 'interpolation quadratique des quaternions (pour l'orientation). L'opérateur peut initialement définir un guide virtuel en trajectoire, puis utiliser l'assistance en translation pour ne se concentrer que sur la démonstration de l'orientation. Nous avons appliqué notre approche dans deux scénarios industriels utilisant un cobot. Nous avons ainsi démontré l'intérêt de notre méthode qui améliore le confort de l'opérateur lors de la comanipulation. / For a very long time, automation was driven by the use of traditional industrial robots placed in cages, programmed to repeat more or less complex tasks at their highest speed and with maximum accuracy. This robot-oriented solution is heavily dependent on hard automation which requires pre-specified fixtures and time consuming programming, hindering robots from becoming flexible and versatile tools. These robots have evolved towards a new generation of small, inexpensive, inherently safe and flexible systems that work hand in hand with humans. In these new collaborative workspaces the human can be included in the loop as an active agent. As a teacher and as a co-worker he can influence the decision-making process of the robot. In this context, virtual guides are an important tool used to assist the human worker by reducing physical effort and cognitive overload during tasks accomplishment. However, the construction of virtual guides often requires expert knowledge and modeling of the task. These limitations restrict the usefulness of virtual guides to scenarios with unchanging constraints. To overcome these challenges and enhance the flexibility of virtual guides programming, this thesis presents a novel approach that allows the worker to create virtual guides by demonstration through an iterative method based on kinesthetic teaching and displacement splines. Thanks to this approach, the worker is able to iteratively modify the guides while being assisted by them, making the process more intuitive and natural while reducing its painfulness. Our approach allows local refinement of virtual guiding trajectories through physical interaction with the robots. We can modify a specific cartesian keypoint of the guide or re- demonstrate a portion. We also extended our approach to 6D virtual guides, where displacement splines are defined via Akima interpolation (for translation) and quadratic interpolation of quaternions (for orientation). The worker can initially define a virtual guiding trajectory and then use the assistance in translation to only concentrate on defining the orientation along the path. We demonstrated that these innovations provide a novel and intuitive solution to increase the human's comfort during human-robot comanipulation in two industrial scenarios with a collaborative robot (cobot).

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