The tables describing the geometry of the yield surface are derived. They concern only fcc metals which undergo isotropic hardening, and which glide on the 24 {111} slip systems. The tables list all five dimensional vertices, and edges of the fourth, third and second order limiting the yield surface as well as the slip systems with which they are associated. A direct method for calculating the yield vectors for any orientation, in five dimensional stress space is established, which enables the user to obtain the yield surface without need of knowing the six deviator stress components. / The relaxed constraint theory, which, by contrast to the classical theory, prescribes only part of the strain increment tensor, is applied to the case of the fixed end torsion test. By taking account of the deformed shape of the grains, three strain components are prescribed; axisymmetry of the sample, which is assumed for every grain, leads to the prescription of another strain component. A further equilibrium condition on the stress associated with the absence of surface tractions leads to an additional constraint. The Yield Subsurface Analysis, which consists of cutting the five dimensional yield surface by the planes of the prescribed stresses, and selecting the p dimensional vertices (p being the number of prescribed strains) that provide maximum work, is carried out. The results are compared with the ones of the classical theory where all the strain components are known. / The simulations are carried out to shear strains of 10, and the orientation changes are calculated incrementally assuming the shear plane and shear direction to be fixed in space. / The texture results are similar up to shear strains of about 3, but differ significantly at larger strains. The relaxed constraint theory predicts the strengthening of the {100} texture component and the development of an equally strong {hk1} fiber component at the expense of the {111} fiber component, whereas the classical theory predicts a very strong {111} fiber component. At large strains, the experimental results agree better with the relaxed constraint predictions. / The average Taylor factors do not exhibit the same trends, since the Bishop and Hill theory predicts a continuous decrease and the RC theory a slight decrease followed by a continuous increase. . . . (Author's abstract exceeds stipulated maximum length. Discontinued here with permission of author.) UMI

No description available.

Every aerobic organism expresses cytochrome c oxidase to catalyze reduction of molecular oxygen to water, and takes advantage of this energy releasing reaction to produce an electrochemical gradient used in cellular energy production. The protein SCO (Synthesis of cytochrome c oxidase) is a required assembly factor for the oxidase, conserved across many species. SCO is implicated in the assembly of one of two copper centres (ie., CuA) of cytochrome oxidase. The exact mechanism of SCO’s participation in CuA assembly is not known. SCO has been proposed to bind and deliver copper, or alternatively to act in reductive preparation of the CuA site within the oxidase. In this body of work, the strength and stability of Cu(II) binding to Bacillus subtilis SCO is explored via electronic absorption and fluorescence spectroscopies and by calorimetric methods. An equilibrium dissociation constant (Kd) of 3.5x10-12 M was determined as an upper limit for the BsSCO-Cu(II) interaction, via differential scanning calorimetry. In the first reported case for a SCO homolog, dissociation kinetics of Cu(II) from BsSCO were characterized, and found to be dependent on both ionic strength and the presence of free Cu(II) in solution. Further differential scanning calorimetry experiments performed at high ionic strength support a two-step model of BsSCO and Cu(II) binding. The implications of this model for the BsSCO-Cu(II) interaction are presented in relation to the mechanism of interaction between SCO and the CuA site of cytochrome c oxidase. / Thesis (Master, Biochemistry) -- Queen's University, 2007-09-21 16:00:23.621

The shift in paradigm which gave rise to relativism has brought about a number of reconsiderations of the critical act--reconsiderations which question in a fundamental way the objectivity of the subject, the autonomy of the object of study, and the neutrality of language. Recent advances in the field of translatology participate in this shift in paradigm, insofar as they dismantle the discourse of transparency and restore to translators their primary role in the reception/re-enunciation of the source text. / A study of the production and reception of Anne Cameron's Daughters of Copper Woman (1981) demonstrates the extent to which the translator, in choosing to take on the stakes arising from the source text, becomes responsible for her/his performed act of mediating. / Furthermore, the translator must be prepared to accept the subjectivity of her/his own reading and ideological convictions, and to contest the value of invisibility traditionally attached to the translator' s role. Analysis of the translations of the first ten short stories of Daughters of Copper Woman illustrates how the translator's ideological stance orients her translation choices. In this thesis, the translator's process of textual intervention is examined from two distinct but complementary perspectives--the feminist and the Bermanian.

No description available.

No description available.

No description available.

No description available.

No description available.

No description available.