Thèse de doctorat : Mécanique des matériaux : Metz : 2006. / hèse soutenue sur ensemble de travaux. Bibliogr. p. 183-185. Annexes.

Thesis (Ph. D.)--University of Hong Kong, 1982.

No description available.

No description available.

The principle concern of this work is the design of a lathe attachment for grinding non-circular 'polygonal' shaped workpieces suitable for use as torque transmitting machine elements. In the course of the work substantial attention is also given to the general theory and development of computer aided error analysis procedures for planar linkage mechanisms. A further smaller part of the work investigates the torsion of polygonal shafts. The non-circular shapes considered here may be loosely defined as polygonal profiles. Their application is in torque transmitting couplings for which they represent an alternative to keyed and splined couplings, although, in comparison to keys and splines, their application has been limited, mainly due to the specialised nature of their manufacture. The main objective of this work is to investigate suitable profiles and the means for their production using an attachment which can be mounted on a conventional machine tool, such as a lathe or grinding machine. The work progresses from initial consideration of shapes produced by various geometric generating methods and conception of an 'ideal' profile generating linkage mechanism through to detailed design of a precision, polygonal profile grinding, lathe attachment, and final assessment of its feasibility based on a profile precision criterion. In order to assess the precision of the attachment, computer-aided procedures are developed, after consideration of existing error analysis methods and their limitations for use in this case. These consider the various effects of tolerances, clearances and deflections upon mechanism output. As a coincidental investigation, the mechanical behaviour and strength of polygonal shaft-hub connections is reported. In particular, the torsion of a polygonal bar is theoretically analysed, using a stress function method, to determine maximum shear stresses.

The purpose of this thesis is to generalize to the torsion-theoretic setting various concepts and results from the theory of rings and modules. In order to accomplish this we begin with some preliminaries which introduce the main ideas used in torsion theory, the major ones being [tau]-torsion and [tau]-torsionfree modules as well as [tau]-dense and [tau]-pure submodules. In the first chapter we also introduce a new concept, that of a [tau]-compact module, which is basic enough to deserve a place among the preliminaries. The results that we obtain fall into three areas which are to a certain degree interrelated. The first area is on [tau]-Max modules, which we introduce as a torsion-theoretic analogue of Max modules. The main aim is to generalize a well-known result by Shock which characterizes Noetherian rings by using the socle, the radical and Max modules. All of these concepts have torsion-theoretic counterparts which we utilize in our generalization. Furthermore, we define and characterize left [tau]-Max rings and apply the torsion-theoretic version of Shock�s theorem to obtain a characterization of [tau]-short modules motivated by a recent article in which short modules were introduced. The second area deals with various flavours of [tau]-injectivity, some known and some new. We introduce [tau]-M-injective and s-[tau]-M-injective modules and examine their relationship with the known concepts of [tau]-injective and [tau]-quasi-injective modules. We then provide an improved version of the Generalized Fuchs Criterion which characterizes s-[tau]-M-injective modules, and give a generalization of Azumaya�s Lemma. We also prove that every M-generated module has a [tau]-M-injective hull which is unique up to isomorphism and show how this is linked to the [tau]-quasi-injective hull. We then examine [Sigma]-[tau]-injectivity, generalizing well-known results by Faith, Albu and Năstăsescu and Cailleau which provide necessary and sufficient conditions for the [Sigma]-[tau]-injective property, the [Sigma]-s-[tau]-M-injective property and for a direct sum of [Sigma]-s-[tau]-M-injective modules to be [Sigma]-s-[tau]-M-injective. In the third area we introduce a couple of new concepts with the aim of bringing to the torsion-theoretic setting the concept of a CS or extending module. The approach is twofold. The first is via [tau]-CS modules which serve as a generalization of CS modules as well as [tau]-quasi-continuous, [tau]-quasi-injective and [tau]-injective modules, and the second is via s-[tau]-CS modules which are a special case of CS modules. Our motivation is to provide a torsion-theoretic analogue of a well-known result by Okado which characterizes Noetherian modules. We have some partial results using s-[tau]-CS modules and a nice torsion-theoretic analogue, albeit without the use of [tau]-CS or s-[tau]-CS modules. We also examine the relationship between our relative versions of CS modules with those of other authors and obtain refinements to some of their results.

Thesis (Ph. D.)--University of Akron, Dept. of Chemistry, 2007. / "December, 2007." Title from electronic dissertation title page (viewed 03/19/2008). Advisor, David S. Perry; Committee members, Edward C. Lim, David Modarelli, Jutta Luettmer-Strathmann, Steven S. Chuang; Department Chair, Kim C. Calvo; Dean of the College, Ronald Levant; Dean of the Graduate School, George R. Newkome. Includes bibliographical references.

Thesis (M.S.)--Ohio University, March, 1982. / Title from PDF t.p.

Thesis (Ph. D.)--University of Washington, 1996. / Vita. Includes bibliographical references (p. [117]-118).

Thesis (Ph. D.)--West Virginia University, 2004. / Title from document title page. Document formatted into pages; contains viii, 180 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 123-128).