Effective interaction between star polymers

The distance-resolved effective interaction between two star polymers in a good solvent is calculated by Molecular Dynamics computer simulations. The results are compared with a pair potential proposed recently by Likos et al. [Phys. Rev. Lett. 1998, 80, 4450] which is exponentially decaying for large distances and crosses over, at the corona diameter of the star, to an ultrasoft logarithmic repulsion for small distances. Excellent agreement is found in a broad range of star arm numbers.Comment: final version as published, 9 pages + 5 ps-figure

Soliton Staircases and Standing Strain Waves in Confined Colloidal Crystals

We show by computer simulation of a two-dimensional crystal confined by corrugated walls that confinement can be used to impose a controllable mesoscopic superstructure of predominantly mechanical elastic character. Due to an interplay of the particle density of the system and the width D of the confining channel, "soliton staircases" can be created along both parallel confining boundaries, that give rise to standing strain waves in the entire crystal. The periodicity of these waves is of the same order as D. This mechanism should be useful for structure formation in the self-assembly of various nanoscopic materials.Comment: 22 pages, 5 figure

Jesus Christ as Woman Wisdom: Feminist Wisdom Christology, Mystery, and Christ's Body

This thesis explores Wisdom Christology, the association of Jesus Christ and the mysterious and neglected biblical figure of Woman Wisdom. Because the descriptions of her bear a striking resemblance to the portrayal of Jesus Christ, I argue that they can be seen as two names for the same figure: Christ-Wisdom. This link between Jesus Christ and Woman Wisdom has some interesting repercussions in Christology. Firstly, it emphasizes the mysteriousness of Jesus Christ, preventing the illusion that Jesus Christ can be fully understood. In fact, the incarnation is a deepening of the mystery of God, meaning that theological language must rely on paradox and metaphor to describe the indescribable. I argue that the name Jesus Christ is inclusive, wide enough to hold many names, including that of Woman Wisdom, which he sanctifies so they become appropriate names for the divine. Secondly, the association of Jesus Christ with Woman Wisdom affects the gender of Jesus Christ. Throughout Christian history, there has been a gender fluidity in depictions of Jesus Christ, something legitimated by his full divinity. This does not mean his historical life as a male human being can be ignored, but although he was of the male sex, he arguably did not strictly adhere to socio-cultural gender expectations. Likewise, in Woman Wisdom, Jesus Christ provides an alternative, atypical way of being female. This relativizes the gender of Christ-Wisdom, pointing beyond it to the radical solidarity of the divine with all humanity in the incarnation. Thirdly, to view Christ as Wisdom changes the way gender is understood within the Church, the Body of Christ. If the Church is the representative of Christ-Wisdom, it is therefore a multi-gendered body in which Jesus Christ takes on male and female embodiment. In contrast to gendered ethical models, the Church thus has one ethical example in Christ-Wisdom, which all follow. Because of the various gifts of the Spirit, diversity remains, but is transformed so that differences, including gender, do not limit or determine the roles of believers in the Church, but remain part of the richness of the one Body under its one Head, Christ-Wisdom

Evidence for complete and partial surface renewal at an air-water interface

A wind-wave flume is used to determine the extent to which the thermal boundary layer (TBL) at a wind-forced air-water interface is completely renewed from below. We measure skin temperature, Tskin, radiometrically, temperature immediately below the TBL, Tsubskin, using a temperature profiler, and net heat flux using the gradient flux technique. The Tskin probability density function, p(Tskin), and surface renewal time scale, τ, were measured using passive and active infrared imaging techniques, respectively. We find that the mean percentile rank of Tsubskin in p(Tskin) is 99.90, implying that complete surface renewal occurs. This result suggests an alternative to radiometric measurement of Tskin through the simple combination of an infrared camera and an in situ temperature sensor. Comparison of the temperature difference across the TBL to the expected cooling implies that a significant portion of events only partially renew the TBL. This result should impact efforts to improve air-sea transfer models