The G20: 9 facts and figures Factsheet for Policy Brief 6/2018: The G20 is turning 20. Time to take stock of multilateralism

1. What is the G20? – An overview 2. How does the G20 work? – More than just a summit 3. Interaction, participation, influence? – The engagement groups of the G20 4. New tasks, new challenges – Expanding the range of issues in the G20 portfolio 5. Important, but unknown? – Knowledge about the G20 in its member countries 6. Thumbs up or thumbs down? – How citizens view the G20 7. Assessments of the G20 summit in its member countries 8. Media coverage of the G20 in its member countries 9. Country profile

Describing a class of global attractors via symbol sequences

We study a singularly perturbed scalar reaction-diffusion equation on a bounded interval with a spatially inhomogeneous bistable nonlinearity. For certain nonlinearities, which are piecewise constant in space on 푘 subintervals, it is possible to characterize all stationary solutions for small ε by means of sequences of 푘 symbols, indicating the behavior of the solution in each subinterval. Determining also Morse-indices and zero numbers of the equilibria in terms of the symbol sequences, we are able to give a criterion for heteroclinic connections and a description of the associated global attractor for all 푘

The numerical solution of forward–backward differential equations: Decomposition and related issues

NOTICE: this is the author’s version of a work that was accepted for publication in Journal of computational and applied mathematics. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of computational and applied mathematics, 234,(2010), doi: 10.1016/j.cam.2010.01.039This journal article discusses the decomposition, by numerical methods, of solutions to mixed-type functional differential equations (MFDEs) into sums of “forward” solutions and “backward” solutions

On the Reactivity of Phosphaalumenes towards C−C Multiple Bonds

Heterocycles containing group 13 and 15 elements such as borazines are an integral part of organic, biomedical and materials chemistry. Surprisingly, heterocycles containing P and Al are rare. We have now utilized phosphaalumenes in reactions with alkynes, alkenes and conjugated double bond systems. With sterically demanding alkynes 1,2-phosphaalumetes were afforded, whereas the reaction with HCCH or HCCSiMe3 gave 1,4-phosphaaluminabarrelenes. Using styrene saturated 1,2-phosphaalumates were formed, which reacted further with additional styrene to give different regio-isomers of 1,4-aluminaphosphorinanes. Using ethylene, a 1,4-aluminaphosphorinane is obtained, while with 1,3-butadiene a bicyclic system containing an aluminacyclopentane and a phosphirane unit was synthesized. The experimental work is supported by theoretical studies to shed light on the mechanism governing the formation of these heterocycles

MP2 - Mathe/Plus/Praxis: Strategien zur Vorbeugung gegen Studienabbruch

Die Grundlagenfächer, und dabei insbesondere die Mathematik, stellen in den Ingenieurwissenschaften für eine große Gruppe von Studierenden eine scheinbar unüberwindliche Hürde dar. Im Projekt MP2 – Mathe/Plus/Praxis wurden an der Fakultät für Mathematik der Ruhr-Universität Bochum Maßnahmen entwickelt und erprobt, um hohen Durchfallquoten und unnötigem Studienabbruch in der Studieneingangsphase der Ingenieurwissenschaften entgegenzuwirken. Die Ausgestaltungen der beiden Teilprojekte MathePlus und MathePraxis, die bisherigen Evaluationsergebnisse sowie aktuelle Weiterentwicklungen werden näher vorgestellt. 10.11.2014 | Herold Dehling, Eva Glasmachers, Birgit Griese, Jörg Härterich & Michael Kallweit (Bochum

Ein unsymmetrisches, cyclisches Diboren basierend auf einem chelatisierenden CAAC-Liganden sowie dessen Aktivierung kleiner Moleküle und Umlagerungsreaktionen

Eine Eintopfsynthese eines CAAC-stabilisierten, unsymmetrischen, cyclischen Diborens wurde mittels Zweielektronenreduktion eines CAAC-Addukts von B2Br4(SMe2)2 entwickelt. Theoretische Studien offenbarten, dass dieses Diboren einen signifikant geringeren HOMO-LUMO-Abstand als bisher beschriebene NHC- und Phosphan-stabilisierte Diborene besitzt. Die Komplexierung des Diborens mit [AuCl(PCy3)] lieferte zwei Diboren-AuI-π-Komplexe, während die Reaktion mit DurBH2, P4 und einem terminalen Alkin zur Spaltung der B-H-, P-P- beziehungsweise C-C-π-Bindung führte. Die thermische Umlagerung des Diborens ergab ein elektronenreiches cyclisches Alkylidenboran, welches über die B=C-Doppelbindung direkt an AgI koordiniert werden konnte

Traveling waves and pattern formation for spatially discrete bistable reaction-diffusion equations (survey)

Analysis and Stochastic

Petróleo, fronteiras e boomerangs: A disputa timorense-australiana pelo mar de Timor

O desenvolvimento económico de Timor-Leste está ligado ao acesso ao petróleo ao largo da sua costa. Neste texto são analisadas as negociações entre Timor- Leste e a Austrália no que toca aos recursos petrolíferos no mar de Timor e ao papel de um Transnational Advocacy Network neste processo. O texto argumenta que a influência desta rede transnacional de atores não-estatais, que se formou para defender os interesses do Estado timorense, contribui para a explicação do resultado das negociações, mostrando que conseguiu exercer pressão sobre o governo australiano