Almost Hermitian Structures with Parallel Torsion

The characteristic connection of an almost hermitian structure is a hermitian connection with totally skew-symmetric torsion. The case of parallel torsion in dimension six is of particular interest. In this work, we give a full classification of the algebraic types of the torsion form, and, based on this, undertake a systematic investigation into the possible geometries. Numerous naturally reductive spaces are constructed and classified as well as examples on nilmanifolds given.Comment: 36 page

Almost Hermitian 6-Manifolds Revisited

A Theorem of Kirichenko states that the torsion 3-form of the characteristic connection of a nearly K\"ahler manifold is parallel. On the other side, any almost hermitian manifold of type $\mathrm{G}_1$ admits a unique connection with totally skew symmetric torsion. In dimension six, we generalize Kirichenko's Theorem and we describe almost hermitian $\mathrm{G}_1$-manifolds with parallel torsion form. In particular, among them there are only two types of $\mathcal{W}_3$-manifolds with a non-abelian holonomy group, namely twistor spaces of 4-dimensional self-dual Einstein manifolds and the invariant hermitian structure on the Lie group \mathrm{SL}(2, \C). Moreover, we classify all naturally reductive hermitian $\mathcal{W}_3$-manifolds with small isotropy group of the characteristic torsion.Comment: 26 pages, revised versio

Iron biogeochemistry across marine systems progress from the past decade

Based on an international workshop (Gothenburg, 14–16 May 2008), this review article aims to combine interdisciplinary knowledge from coastal and open ocean research on iron biogeochemistry. The major scientific findings of the past decade are structured into sections on natural and artificial iron fertilization, iron inputs into coastal and estuarine systems, colloidal iron and organic matter, and biological processes. Potential effects of global climate change, particularly ocean acidification, on iron biogeochemistry are discussed. The findings are synthesized into recommendations for future research areas

The kernel of the Gysin homomorphism for Chow groups of zero cycles.

Let S be a smooth projective surface over a field k, and let C be a smooth hyperplane section of S. For a closed embedding of S into a projective space P consider the linear system Σ of hyperplane sections and the corresponding discriminant locus ∆ of singular hyperplane sections in the dual space. Let U := Σ \ ∆. Let CH0(S) and CH0(C) be the Chow groups of 0-cycles of degree 0 of S and C, respectively. We prove that the kernel of the Gysin homomorphism from CH0(C) to CH0(S) induced by the closed embedding of C into S is the countable union of shifts of a certain abelian subvariety A inside J(C), the Jacobian of the curve C. Moreover, for a Zariski countable open subset V in U , for every closed point t in V, either A at t coincides with a certain abelian variety Bt inside J(C), and then the Gysin kernel is a countable union of shifts of Bt, or A at t is 0, in which case the Gysin kernel is countable. The subset V being countable open allows to apply the irreducibility of the monodromy representation on the vanishing cohomology of a smooth section (for the étale cohomology and for the singular cohomology in a Hodge theoretical context for complex algebraic varieties). We aim to describe the Gysin kernel for the points t in U \ V where the local and global monodromy representations are not fully understood. The approach is to construct a stratification {Ui ⊆ U }i∈I of U by countable open subsets with I an at most countable, partially ordered set, for each of which the monodromy argument applies. We then apply a convergence argument for the stratification {Ui}i∈I such that the monodromy argument applies for U seen as the set-theoretic directed union of all Ui.Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech

Preconstruction Services for the Simpson Strong-Tie Lab Crane

For several years the Construction Management Department faculty have discussed implementing a better system of lifting heavy items in the Simpson Strong-Tie Lab. Currently, student assistants and faculty use a forklift to perform heavy lifting, there are definitely more safe and efficient alternatives available. An under running single girder crane system is in the process of being built in the Simpson Strong Tie lab. A full structural analysis has been calculated assuring the crane can lift up to two tons. This crane will help students and faculty use the lab to build the tiny house as well as other projects in need of lifting heavy items. In order to facilitate this project various preconstruction services are required to get the concept from a good idea, to a viable project. The items I am responsible for are a full construction risk analysis, construction schedule, and an in depth vendor buy out analysis

Expressions of Emotion in Intergroup Apologies and Forgiveness: The moderating role of percieved perpetrator morality

Apologies for intergroup harm have become increasingly common. Despite this, the evidence for the effectiveness of intergroup apologies in promoting forgiveness is mixed. One reason for the mixed findings across studies may be that victim groups attempt to infer the emotions perpetrators are experiencing. The emotions perpetrators express may play an important role in communicating the perpetrator group's motivation for apologizing. Three studies investigated how expressions of emotions in an intergroup apology influenced forgiveness of the perpetrator group. The perceived morality of the perpetrator group emerged as an important moderator of the relationship between the emotion expressed in an apology and forgiveness. When the emotion expressed in an apology is inconsistent with the perceived morality of perpetrators, forgiveness decreased. For example, when perpetrators were moral and expressed guilt (consistency between an emotion and morality), forgiveness was higher than when perpetrators were immoral and expressed guilt (inconsistency between emotion and morality). Implications for research and policy concerning when intergroup apologies can promote reconciliation are discussed

The clash of the sexes in Hesiod's Works and Days

In this paper I argue that Hesiod’s (predominantly negative) views on women in the Works and Days are inextricably linked with his persistent anxieties about life in the Iron Age. I hope to complement the existing scholarship on Hesiod’s approach to gender by pinpointing the ideal of self-sufficiency as a driving force behind Hesiod’s view of women, and by showing how gender in the Works and Days is framed in terms of balance. Hesiod’s suspicion of women in the Works and Days is driven both by concern for the productivity of the individual oikos and by a perceived imbalance between the sexes. Women can therefore be tolerated when they fulfil a low-risk role, or when the genders are in equilibrium. Further, I add to the scholarship on gender in the Works and Days by showing that this attitude to women can be traced in the Days section too: I argue for a link between the earlier and latter parts of the poem which has been mostly ignored

A theorem on zero cycles on surfaces

In this paper we prove a result on 0-cycles on surfaces as an application of the theorem on the kernel of the Gysin homomorphism of Chow groups of 0-cycles of degree zero induced by the embedding of a curve into a surface, and we study the connection of this result with Bloch’s conjecture and constant cycles curves