Berichtigungen und Ergänzungen

Ohne Zusammenfassung     

Über ein Verfahren in der Theorie der impliziten Funktionen und Extremwerte

Ohne Zusammenfassung     

Reaction of Anthranilamide with Phosphorus Pentasulfide: Formation of 2-Mercapto-(1H)-1,3,2λ5-benzodiazaphosphorine-2,4-dithione

The reaction of anthranilamide with phosphorus pentasulfide in boiling pyridine leads to the benzodiazaphosphorine-pyridine salt 2 . The structure is established by elemental analysis, ¹H- ¹³C- ¹⁵N- ³¹P-NMR, and mass spectral data.     

Na+-Selektive Monensin-PVC-Membranelektrode mit Festableitung

Zusammenfassung Eine Monensin-PVC-Membran zur Applikation an Festkontakt-Sensoren wurde entwickelt. Die Meßketten zeigen in Abhängigkeit von der Na⁺-Ionenaktivität ein Nernst-gemäßes elektromotorisches Verhalten. Für die Störionen aus der Reihe der Alkali- und Erdalkaliionen sind die Selektivitätskoeffizienten auch als Funktion ihrer Ionenradien angegeben.

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Na⁺ selective monensin PVC membrane electrode with solid contact

Summary A Monensin PVC membrane has been developed for application to solid contact sensors. Depending on the Na⁺ ion activity, the electrochemical cells show a Nernstlike electromotive behaviour. For interfering ions of the alkaline and alkaline earth series, the selectivity coefficients are also given as a function of their ion radii.

     

Electrostatic force microscopy on oriented graphite surfaces: coexistence of insulating and conducting behaviors

We present measurements of the electric potential fluctuations on the surface of highly oriented pyrolytic graphite using electrostatic force and atomic force microscopy. Micrometric domainlike potential distributions are observed even when the sample is grounded. Such potential distributions are unexpected given the good metallic conductivity of graphite because the surface should be an equipotential. Our results indicate the coexistence of regions with "metalliclike" and "insulatinglike" behaviors showing large potential fluctuations of the order of 0.25 V. In lower quality graphite, this effect is not observed. Experiments are performed in Ar and air atmospheres.     

Absolutbestimmung der spezifischen Aktivität 35S-haltiger Substanzen

Als wesentlichste Vorausselzungen für eine präzise Absolutbestimmung der spezifischen Aktivität ³³S-haltiger Substanzen werden die Sorption von SO₂ an den Zählrohren und der Füllapparatur, die Beeinflussung des Gasentladungsmechanismus im beschränkten Proportionalbereich durch negativ geladene SO₂-Ionen und die kinetischen Isotopieeffekte bei nicht hundertprozentiger Überführung der Ausgangssubstanzen zu Meβgas untersucht. Speziell beschrieben werden die Umsetzung von Natriumsulfat bzw. Schwefelsäure in wäβriger Lösung und Thioharstoff zu Bariumsulfat und dessen Verbrennung zu Schwefeldioxid. Der Gesamtfehlre, mit dem die Angabe der spezifischen Aktivität für die genannten Ausgangssubstanzen behaftel ist, wird angegeben.     

Ordinal patterns in epileptic brains: Analysis of intracranial EEG and simultaneous EEG-fMRI

Epileptic seizures are associated with high behavioral stereotypy of the patients. In the EEG of epilepsy patients characteristic signal patterns can be found during and between seizures. Here we use ordinal patterns to analyze EEGs of epilepsy patients and quantify the degree of signal determinism. Besides relative signal redundancy and the fraction of forbidden patterns we introduce the fraction of under-represented patterns as a new measure. Using the logistic map, parameter scans are performed to explore the sensitivity of the measures to signal determinism. Thereafter, application is made to two types of EEGs recorded in two epilepsy patients. Intracranial EEG shows pronounced determinism peaks during seizures. Finally, we demonstrate that ordinal patterns may be useful for improving analysis of non-invasive simultaneous EEG-fMRI.     

Sound segregation based on temporal envelope structure and binaural cues

The ability to segregate two spectrally and temporally overlapping signals based on differences in temporal envelope structure and binaural cues was investigated. Signals were a harmonic tone complex (HTC) with 20 Hz fundamental frequency and a bandpass noise (BPN). Both signals had interaural differences of the same absolute value, but with opposite signs to establish lateralization to different sides of the medial plane, such that their combination yielded two different spatial configurations. As an indication for segregation ability, threshold interaural time and level differences were measured for discrimination between these spatial configurations. Discrimination based on interaural level differences was good, although absolute thresholds depended on signal bandwidth and center frequency. Discrimination based on interaural time differences required the signals' temporal envelope structures to be sufficiently different. Long-term interaural cross-correlation patterns or long-term averaged patterns after equalization-cancellation of the combined signals did not provide information for the discrimination. The binaural system must, therefore, have been capable of processing changes in interaural time differences within the period of the harmonic tone complex, suggesting that monaural information from the temporal envelopes influences the use of binaural information in the perceptual organization of signal components.