The symmetries of the Manton superconductivity model

The symmetries and conserved quantities of Manton's modified superconductivity model with non-relativistic Maxwell-Chern-Simons dynamics (also related to the Quantized Hall Effect) are obtained in the ``Kaluza-Klein type'' framework of Duval et al.Comment: 24 pages, Plain TEX, no figure

Non-relativistic Maxwell-Chern-Simons Vortices

The non-relativistic Maxwell-Chern-Simons model recently introduced by Manton is shown to admit self-dual vortex solutions with non-zero electric field. The interrelated ``geometric'' and ``hidden'' symmetries are explained. The theory is also extended to (non-relativistic) spinors. A relativistic, self-dual model, whose non-relativistic limit is the Manton model is also presented. The relation to previous work is discussed.Comment: 20 pages plain TeX. Revised: minor errors corrected and symmetries explained in a clearer way. Version as will appear in Ann. Phys. (N.Y.

Teacher Leadership in the Context of International Schools: The Key Attributes and Development of Teacher Leaders

Teacher leaders have been acknowledged for playing a significant role in supporting student learning. The impact of these key individuals often centers upon influencing the professional work of colleagues and having the capacity to make important leadership decisions that shape aspects of the school beyond their classrooms.Currently, the body of research on teacher leadership in international schools is limited. The purpose of the study was to contribute to the body of knowledge related to teacher leadership in the context of international schools and is motivated by the following three research questions: (1) What types of teacher leadership roles (formal and informal) exist in international schools? (2) What are the most important attributes for teacher leaders? (3) What programs and/or activities do teacher leaders identify as valuable in developing the attributes of a successful teacher leader?All Principals and Teacher Leaders (formal and informal) served as the accessible population for the study. Principals and Teacher Leaders completed surveys in accordance with their roles in order to gather data for the study. The significance of the study was based upon the practical implications of possible findings. With a broader understanding of how teacher leadership is being enacted, the most important attributes of teacher leaders, and how teacher leaders are developed, international school leaders was able to use the findings for strategic efforts to support teacher leadership. Knowledge of the most important attributes may help with developing criteria for selection and evaluation of teacher leaders, while an understanding of how teacher leaders are developed may provide insight into the type of professional development or experiences necessary to cultivate this category of leaders

The effect of aryl substituted triamidoamine ligands on the structure of dioxo-molybdenum (VI) complexes

Abstract only availableMolybdenum is a known transition metal recognized for its crucial role as an active center for oxygen transfer in enzymes and has also been known to split dinitrogen. Experiments conducted during the internship period included the use of stabilizing multidentate ligands synthesized from tris aminoethyl amine (TREN) with aromatic aldehydes including binapthalene, benzene, and pyridine with synthesized molybdenum (VI) complexes MoO2Cl2(Me3PO)2, MoO2Cl2(MePh2PO)2, and MoO2Cl2(Ph3PO)2. Preliminary findings at the conclusion of the summer research phase indicate that pyridine-based TREN ligands are readily sterically adaptable to the octahedral molybdenum (VI) geometry and produce viable TREN ligand-molybdenum (VI) complexes for analysis by cyclic voltammetry. Future experimentation will seek to further knowledge of energy changes and interactions within the 5d orbitals during the formation of the TREN ligand-molybdenum complex, as well as redox chemistry of high oxidative oxomolybdenum derivatives to fully comprehend the role of this metal in relation to oxygen transfer.NSF-REU/NIH Program in Radiochemistr

Development of three-dimensional finite element software for curved plate girder and tub girder bridges during construction

Because of its ability to be easily shaped, steel is an attractive material for curved girders. Plate girder and tub girder bridges, for example, are often the preferred solution for direct connectors in highway networks. This flexibility in fabrication, however, presents challenges for structural engineers because of the difficulties associated with accounting for combined bending and torsion with curved geometry. The potential presence of skewed supports is a further source of complexity. In fact, no commercial structural engineering program currently addresses the evaluation of plate girder and tub girder bridges while modeling them to the full extent of their three-dimensional configuration. Most engineers, for example, use a two-dimensional bridge representation, which is often accurate for typical design of a complete bridge but may also be unconservative in many cases. The few programs that allow a full three-dimensional representation require extensive knowledge of finite element theory as well as significant time to model any complex structure. This dissertation presents the assumptions, methodology and calculations involved in the programming of a new structural engineering program designed to assess the behavior and stability or curved plate girder and tub girder bridges during erection or deck placement. It then illustrates the capabilities of the program for various structural systems subjected to a variety of loads, from self-weight to wind and temperature loads. In addition to a linear elastic analysis, multiple types of analysis are offered to the engineer: a geometrically nonlinear analysis provides a more accurate behavior for flexible systems, a linearized buckling analysis yields an upper bound evaluation of the stability of the structure, while a modal dynamic analysis estimates the free vibration modes of that structure.Civil, Architectural, and Environmental Engineerin

PENDANTSS: PEnalized Norm-ratios Disentangling Additive Noise, Trend and Sparse Spikes

Denoising, detrending, deconvolution: usual restoration tasks, traditionally decoupled. Coupled formulations entail complex ill-posed inverse problems. We propose PENDANTSS for joint trend removal and blind deconvolution of sparse peak-like signals. It blends a parsimonious prior with the hypothesis that smooth trend and noise can somewhat be separated by low-pass filtering. We combine the generalized quasi-norm ratio SOOT/SPOQ sparse penalties $\ell_p/\ell_q$ with the BEADS ternary assisted source separation algorithm. This results in a both convergent and efficient tool, with a novel Trust-Region block alternating variable metric forward-backward approach. It outperforms comparable methods, when applied to typically peaked analytical chemistry signals. Reproducible code is provided

Uranium: The problem, or the solution?

Abstract only availableUranium is of great importance as a nuclear fuel and is used to generate electrical power, produce isotopes, and to make weapons. The possibility of developing a realistic flow scheme for nuclear fuel reprocessing or separation for segregation is one that the Chemistry Department at MU consistently looks into. One way to better optimize waste extraction is to possibly bind two separate functional groups to uranyl(VI) [UO22+] so that the reactions will occur selectively. The product of interest is a mixed uranyl iodide/amide and is a novel uranium compound generated for further study. This is accomplished with the following reactions. UO3 --TfOTf--- UO2(OTf)2 UO2I2(THF)3 + 2KOTfUO2(OTf)2 + 2KI ---THF---- UO2I[N(SiMe3)] + KIUO2I2(THF)3 + K[N(SiMe3)3] ----THF- After completing the reactions under an inert atmosphere, an orange product formed. The next step in this research requires NMR analysis and X-Ray crystallography to determine if this product is the target molecule desired.NSF-REU Radiochemistr

Etude des méthodes éprouvées et innovantes pour la surveillance des digues

National audienceNowadays flood protection dikes surveillance is mostly ensured by visual inspection. There is only few instrumental monitoring whereas it could be used as a relevant approach, complementary to visual inspection. In particular instrumental monitoring can offer continuous and/or wide range surveillance, which is especially useful when dealing with dikes. Instrumental monitoring methods can also help optimizing visual surveillance during flood, when human resources can be scarcer than usual. An overview of the tried and tested surveillance techniques as well as the innovative ones has been made. The objective was to summarize the pros and cons of each technique toward the main dikes failure mechanisms. The techniques have been chosen regarding their range, efficiency and capacity of producing a relevant and precise diagnosis. The development level has also been evaluated through the feedbacks that could be identified. A specific focus is also given on the time and resources needed for data processing and interpretation.Aujourd'hui la surveillance des digues de protection contre les inondations est essentiellement assurée par examen visuel. La surveillance instrumentale est peu développée bien qu'elle puisse être considérée comme une approche complémentaire pertinente qui permettrait de pallier les limites pratiques de l'examen visuel : difficultés d'établir une surveillance continue dans le temps et sur des linéaires importants avec des ressources humaines limitées, notamment en période de crue. Afin d'évaluer les apports potentiels de méthodes instrumentale à la surveillance des digues, un état de l'art a été réalisé. Il a eu pour objectif de présenter de manière synthétique les avantages et limites de chaque méthode au regard des mécanismes de rupture susceptibles d'être détectés. Les méthodes ont été sélectionnées en fonction de critères opérationnels : - en premier lieu leur capacité à établir un diagnostic précis vis-à-vis d'un risque donné ; - leur grand rendement, caractéristique essentielle pour surveiller un objet étendu ; - les moyens et le temps nécessaires au traitement et à l'interprétation des données. Cet aspect deviendra notamment critique en période de crue. Ont été considérées à la fois les techniques éprouvées et les méthodes innovantes, parfois encore au stade de R&D. Dans ce cas la maturité de la technologie a été évaluée au regard des retours d'expérience identifiés. Enfin la notion de coût est abordée. Chaque technique retenue est décrite, la conclusion faisant la synthèse des constatations faites. Cet état de l'art pourra être consulté de manière plus complète au travers du rapport publique remis au MEDDE et disponible à la date de parution de cette communication