No abstract

No abstract

No abstract

Understanding and controlling supramolecular polymerization are of fundamental importance to create advanced materials and devices. Many stimuli have been explored in the past decades, but magnetic fields and field gradients have received little attention. This is because magnets do not provide enough magnetic energy to overcome thermal noise at the single molecule level. Here we show that significant changes in network topology of Gd³⁺-decorated supramolecular polymer rods can nevertheless be observed using magnetic fields of order 1 T at room temperature. The structure of the rod networks is influenced during a slow diffusive process over a timescale of hours by the anisotropy of the demagnetizing field. Our approach opens opportunities to control and tune structure formation of many supramolecular and coordination polymers using a variety of rare earth or other paramagnetic ions.

Abstract. In collaborative and interoperable information systems it is frequently necessary to export a subset of an ontology, in particular to export all instances and axioms subsumed by a shared domain ontology. Technically this can be realized by projecting the Abox axioms of the private instances to the vocabulary of the shared ontology using a reasoner. We show that the direct application of this method results in a very redundant export. Therefore, we propose methods to generate a much smaller equivalent export in an efficient way. These methods are based on a deep analysis of properties of axiom sets that can be used to efficiently filter redundancies during the export process and provide methods to further minimize redundancies in the result. We evaluate the performance and the degree of minimality that can be reached with our approach with standard benchmarking ontologies with large Aboxes and a use case of the bio-medical domain.