- 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.
Search results
Showing 351 to 353 of 353 (0.014 seconds)| 351 |
周波数偏差を伴うスペクトル拡散信号における高速同期捕捉に関する研究片山, 正昭 January 1997 (has links)
科学研究費補助金 研究種目:基盤研究(C)(2) 課題番号:07805037 研究代表者:片山 正昭 研究期間:1995-1996年度
|
| 352 |
Achieving Complex Motion with Fundamental Components for Lamina Emergent MechanismsWinder, Brian Geoffrey 01 March 2008 (has links) (PDF)
Designing mechanical products in a competitive environment can present unique challenges, and designers constantly search for innovative ways to increase efficiency. One way to save space and reduce cost is to use ortho-planar compliant mechanisms which can be made from sheets of material, or lamina emergent mechanisms (LEMs). This thesis presents principles which can be used for designing LEMs. Pop-up paper mechanisms use topologies similar to LEMs, so it is advantageous to study their kinematics. This thesis outlines the use of planar and spherical kinematics to model commonly used pop-up paper mechanisms. A survey of common joint types is given, as well as an overview of common monolithic and layered mechanisms. In addition, it is shown that more complex mechanisms may be created by combining simple mechanisms in various ways. The principles presented are applied to the creation of new pop-up joints and mechanisms, which also may be used for lamina emergent mechanisms. Models of the paper mechanisms presented in Chapter 2 of the thesis are found in the appendix, and the reader is encouraged to print, cut out and assemble them. One challenge associated with spherical and spatial LEM design is creating joints with the desired motion characteristics, especially where complex spatial mechanism topologies are required. Hence, in addition to a study of paper mechanisms, some important considerations for designing joints for LEMs are presented. A technique commonly used in robotics, using serial chains of revolute and prismatic joints to approximate the motion of complex joints, is presented for use in LEMs. Important considerations such as linkage configuration and mechanism prototyping are also discussed. Another challenge in designing LEMs is creating multi-stable mechanisms with the ability to have coplanar links. A method is presented for offsetting the joint axes of a spatial compliant mechanism to introduce multi-stability. A new bistable spatial compliant linkage that uses that technique is introduced. In the interest of facilitating LEM design, the final chapter of this thesis presents a preliminary design method. While similar to traditional methods, this method includes considerations for translating the mechanism topology into a suitable configuration for use with planar layers of material.
|
| 353 |
Graphic revolt! : Scandinavian artists' workshops, 1968-1975 : Røde Mor, Folkets Ateljé and GRASGlomm, Anna Sandaker January 2012 (has links)
This thesis examines the relationship between the three artists' workshops Røde Mor (Red Mother), Folkets Ateljé (The People's Studio) and GRAS, who worked between 1968 and 1975 in Denmark, Sweden and Norway. Røde Mor was from the outset an articulated Communist graphic workshop loosely organised around collective exhibitions. It developed into a highly productive and professionalised group of artists that made posters by commission for political and social movements. Its artists developed a familiar and popular artistic language characterised by imaginative realism and socialist imagery. Folkets Ateljé, which has never been studied before, was a close knit underground group which created quick and immediate responses to concurrent political issues. This group was founded on the example of Atelier Populaire in France and is strongly related to its practices. Within this comparative study it is the group that comes closest to collective practises around 1968 outside Scandinavia, namely the democratic assembly. The silkscreen workshop GRAS stemmed from the idea of economic and artistic freedom, although socially motivated and politically involved, the group never implemented any doctrine for participation. The aim of this transnational study is to reveal common denominators to the three groups' poster art as it was produced in connection with a Scandinavian experience of 1968. By ‘1968' it is meant the period from the late 1960s till the end of the 1970s. It examines the socio-political conditions under which the groups flourished and shows how these groups operated in conjunction with the political environment of 1968. The thesis explores the relationship between political movements and the collective art making process as it appeared in Scandinavia. To present a comprehensible picture of the impact of 1968 on these groups, their artworks, manifestos, and activities outside of the collective space have been discussed. The argument has presented itself that even though these groups had very similar ideological stances, their posters and techniques differ. This has impacted the artists involved to different degrees, yet made it possible to express the same political goals. It is suggested to be linked with the Scandinavian social democracies and common experience of the radicalisation that took place mostly in the aftermath of 1968 proper. By comparing these three groups' it has been uncovered that even with the same socio-political circumstances and ideological stance divergent styles did develop to embrace these issue.
|
Page generated in 0.0273 seconds