Ion-Mobility Mass Spectrometry for the Rapid Determination of the Topology of Interlocked and Knotted Molecules.

A rapid screening method based on traveling-wave ion-mobility spectrometry (TWIMS) combined with tandem mass spectrometry provides insight into the topology of interlocked and knotted molecules, even when they exist in complex mixtures, such as interconverting dynamic combinatorial libraries. A TWIMS characterization of structure-indicative fragments generated by collision-induced dissociation (CID) together with a floppiness parameter defined based on parent- and fragment-ion arrival times provide a straightforward topology identification. To demonstrate its broad applicability, this approach is applied here to six Hopf and two Solomon links, a trefoil knot, and a [3]catenate.Deutsche Forschungsgemeinschaft (CRC 765 “Multivalency”). Alexander von Humboldt Foundation. Swiss National Science Foundation (PZ00P2_161270). Fondation Wiener-Anspach

The investigations of electrical steel nonuniformity

The results of mapping the magnetic field strength above different electrical steel sheets have been presented. Testing area was relative large - Epstein apparatus strips dimensioned 3 cm by 28 cm have been investigated. The results of mapping have been presented in the form of histograms. In comparison with other methods of steel testing presented method may help to search for the reason of material quality deterioration

New method of texture and anisotropy analysis in GO SiFe steel

It is possible, using thin film Permalloy MR sensors, to analyse the local values of magnetic field strength for different directions of magnetising field. The sensor and the magnetising yoke are rotated and the magnetic field is measured for arbitrary direction of magnetisation (with respect to the rolling direction). In this way the anisotropy of magnetic field strength and the inclination of local anisotropy axis can be determined. After statistical processing of the acquired data we can analyse the texture of the tested sheet

2D analysis of magnetic field strength in GO SiFe steel sheets

It is possible to determine one component of magnetic field strength in the electrical steel sheet using thin film magnetoresistive (MR) sensor. Next, using separately measured both components of H, we can merge the results to get the vector of magnetic field strength. The same results may be obtained with the assembly of two sensors. After measurement of the vector values of B and H we can determine electrical steel parameters, like losses and permeability for different directions of excitation. This enables the tensor description of electrical steel parameters