2.2 Organische industrielle Produkte

Ohne Zusammenfassung     

Ein elektrisch heizbares Bad

Ohne Zusammenfassung     

Ueber die titrimetrische Bestimmung der Oxals?ure durch Kaliumpermanganat bei Gegenwart von Salzs?ure

Ohne Zusammenfassung     

On the Weak Invariance Principle for Non-Adapted Sequences under Projective Criteria

In this paper we study the central limit theorem and its weak invariance principle for sums of non-adapted stationary sequences, under different normalizations. Our conditions involve the conditional expectation of the variables with respect to a given σ-algebra, as done in Gordin (Dokl. Akad. Nauk SSSR 188, 739–741, 1969) and Heyde (Z. Wahrsch. verw. Gebiete 30, 315–320, 1974). These conditions are well adapted to a large variety of examples, including linear processes with dependent innovations or regular functions of linear processes.     

Influence of Data Acquisition Environment on Accuracy of Acoustic Voice Quality Measurements

Accuracy of acoustic voice analysis is influenced by the quality of recording. Lately, articles have suggested that soundcards perform equivalently to specialized professional-grade data acquisition (DA) systems. The purpose of this study was to investigate the influence of DA environment (DA system and microphone) on acoustic voice quality measurement (VQM) while balancing for gender, age, intersubject and intrasubject variability, and analysis software. More specifically, the relative performance of different hardware environments and the relationship between their technical characteristics and VQM performance was investigated. The discretization error and the effective dynamic range of the different DA environments were measured. We used 3 software systems to record and measure separately 2000 acoustic samples of sustained phonation for fundamental frequency, jitter, and shimmer. Analyses of variance (ANOVA) were performed with these parameters as the dependent variables. The results of the study suggested that professional-grade DA hardware is strongly recommended to provide accurate and valid voice assessment. The fundamental frequency measurement differences across DA environments were highly correlated to the discretization error (r=1.00), whereas jitter and shimmer were highly correlated to the effective dynamic range of the DA environments (r=-0.68 and r=-0.86, respectively).     

Untersuchungen zur Charakterisierung eines ICP-Spektrometers mittels Lichtleiterkopplung

Zusammenfassung Für ein ICP-Spektrometer, bei dem ein Quarzlichtleiter die optische Kopplung zwischen dem Plasma und einem Polychromator übernimmt, wurden einige analytische Kenndaten ermittelt. Durch Bestimmung der Nachweisgrenze und des BEC-Wertes einerseits sowie der Festlegung der Plasmaleistung und der Meßhöhe des Lichtleiters andererseits wurden die Zusammenhänge zwischen diesen Größen festgestellt und graphisch dargestellt.

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Investigations for the characterisation of an ICP-spectrometer with coupling by optical quartz fibre

Summary A new simultaneous ICP-spectrometer with a polychromator coupled by an optical quartz fibre with the plasma has been characterized. The power of the plasma source on the one side and the observation height of the optical fibre on the other side were varied and the corresponding detection limits and BEC-values were determined. The correlation of these terms are shown graphically.

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Herrn Prof. Dr. H. Hartkamp zum 60. Geburtstag gewidmet