Migration arising from gradients in shear stress: Particle distributions in Poiseuille flow

Experimental evidence for the existence of shear induced migration processes is reviewed and the mechanism by Leighton and Acrivos (1987b) is described in detail. The proposed mechanism is shown to lead to the existence of an additional shear induced migration in the presence of gradients in shear stress such as would be found in Poiseuille flow, and which may be used to predict the amplitude of the observed short-term viscosity increase. The concentration and velocity profiles which result from such a migration are discussed in detail and are compared to the experimental observations of Karnis, Goldsmith and Mason (1966)

The Religion of the Non-Jurors and the Early British Enlightenment: a study of Henry Dodwell

Cataloged from PDF version of article.The article considers the fundamental motivations and associated theological thought of those involved in the Non-Juring schism in the Church of England in the period after the Revolution of 1688. It indicates and exemplifies how that thought is to be related to wider intellectual conflicts of the period, considered as constituting an early phase of Enlightenment/ Counter-Enlightenment debate. The works of the leading Non-Juror theologian, Henry Dodwell, and in particular his writings on the destiny of the soul, serve as an area of focus. Extensive reference is also made to the equally prominent Non-Juror, Charles Leslie. r 2002 Elsevier Science Ltd. All rights reserved

Thomas Allies, John Henry Newman and Providentalist History

Cataloged from PDF version of article.This article discusses and evaluates the historiographical work of a leading Oxford convert and Ultramontane, Thomas Allies (1813 1903). An evaluation of Allies by the criteria of the Ultramontane scholarship he endeavoured to practise allows the article to offer an illustration of the difficulty in establishing and maintaining an autonomous Catholic scholarship during the nineteenth century’s secularising development of academic activity. It also allows substantial description of the patterns of nineteenth-century Catholic historical thought, noting the strength of its commitment to providentialism and, in particular, its apocalyptic character. An examination of the influences brought to bear on the subject’s thought during the formative period of his development as an historian, through his own study and his close friendship with John Henry Newman, indicates the reasons for Allies’s ultimate failure either to create a clear and stimulating product of the Ultramontane historical vision or to achieve an academic or popular reputation as an historian. The article argues that an unresolved conflict, between Allies’s inclination towards a providentialist historiography consistent with his commitment to a Catholic counter-culture and his willingness to accept, under Newman’s guidance, contemporary secular historiographical norms, offers substantial explanation of this failur

Persistent Optically Induced Magnetism in Oxygen-Deficient Strontium Titanate

Strontium titanate (SrTiO$_3$) is a foundational material in the emerging field of complex oxide electronics. While its electronic and optical properties have been studied for decades, SrTiO$_3$ has recently become a renewed materials research focus catalyzed in part by the discovery of magnetism and superconductivity at interfaces between SrTiO$_3$ and other oxides. The formation and distribution of oxygen vacancies may play an essential but as-yet-incompletely understood role in these effects. Moreover, recent signatures of magnetization in gated SrTiO$_3$ have further galvanized interest in the emergent properties of this nominally nonmagnetic material. Here we observe an optically induced and persistent magnetization in oxygen-deficient SrTiO$_{3-\delta}$ using magnetic circular dichroism (MCD) spectroscopy and SQUID magnetometry. This zero-field magnetization appears below ~18K, persists for hours below 10K, and is tunable via the polarization and wavelength of sub-bandgap (400-500nm) light. These effects occur only in oxygen-deficient samples, revealing the detailed interplay between magnetism, lattice defects, and light in an archetypal oxide material.Comment: 10 pages tota