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Stuttgart, Germany

Lenk F.,Hochschule Lausitz FH | Doerner R.,Ferdinand - Braun - Institute | Kurpas P.,Ferdinand - Braun - Institute | Rumiantsev A.,TU Brandenburg
81st ARFTG Microwave Measurement Conference: Metrology for High Speed Circuits and Systems, ARFTG 2013 | Year: 2013

In this paper an analytical derivation of vector network analyzer (VNA) measurement uncertainties due to non-ideal calibration standards for unknown thru calibration (UOSM or UXYZ) is presented. Simple equations for the sensitivity coefficients are obtained. This allows a deep insight into the error propagation mechanism as well as an easy implementation into calibration software. © 2013 IEEE. Source


Rumiantsev A.,MicroTech | Doerner R.,Ferdinand - Braun - Institute | Lenk F.,Hochschule Lausitz FH
European Microwave Week 2012: "Space for Microwaves", EuMW 2012, Conference Proceedings - 42nd European Microwave Conference, EuMC 2012 | Year: 2012

This paper investigates the impact of possible parameter extraction errors caused by inaccurate definition of the calibration reference impedance of in-situ multiline TRL. Two calibration sets implemented on GaAs and Si/SiGe:C wafer processes were quantitatively analyzed. Obtained results demonstrated that for most practical cases' the desired 5%-level of confidence of extracted parameters of high-reflective devices can easily be achieved without additional efforts. Thus' implementation of the in-situ TRL into a characterization workflow of high-performance microwave devices can be significantly simplified. © 2012 EUROPEAN MICROWAVE ASSOC. Source


Schoder M.,Hochschule Lausitz FH | Armbruster U.,Leibniz Institute for Catalysis at the University of Rostock | Martin A.,Leibniz Institute for Catalysis at the University of Rostock
Chemie-Ingenieur-Technik | Year: 2013

Ni- and Ru-containing supported catalysts were prepared and used for the CO2 hydrogenation to methane (Sabatier reaction) in the gas phase. Tests on the effect of the reaction temperature and pressure were in the focus. ZrO2 and γ-Al2O3 were used as suitable catalyst supports. CO2 and H2 conversions of 70-80 % and selectivity to methane of > 99 % were reached. TiO2 and SiO2 based catalysts exclusively lead to CO and seem to be not suited for this reaction. The investigations on the pressure effect impressively demonstrated the influence on the chemical equilibrium. CO2 and H2 can be nearly completely converted with > 99.9 % selectivity to methane over Ru/ZrO2.Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source


Berndt S.,Hochschule Lausitz FH | Mrosk T.,Hochschule Lausitz FH | Doerner R.,Ferdinand - Braun - Institute | Lenk F.,Hochschule Lausitz FH
81st ARFTG Microwave Measurement Conference: Metrology for High Speed Circuits and Systems, ARFTG 2013 | Year: 2013

The uncertainty calculation for on-wafer 1-port S-Parameter measurements due to the uncertainty of coplanar on-chip calibration standards is presented. Analytical expressions for the sensitivities are used and applied for typical fabrication tolerances of monolithic integrated on-chip structures. The method is verified for OSM calibration by means of simulations with a commercial calibration software as well as by measurements, where test-structures with artificial errors were used. In each case the analytically calculated deviation is compared to a numerical approach and good agreement is found. All results are given for a MMIC process on GaAs, but can be adopted for other technologies. © 2013 IEEE. Source


Reichmann H.,Universitatsklinikum Carl Gustav Carus | Reinhardt F.,Lausitzer Seenland Klinikum | Altmann O.,Lausitzer Seenland Klinikum | Brehme S.,Zentrum fur Neurologie und Schmerztherapie | And 4 more authors.
Aktuelle Neurologie | Year: 2012

Traditional limits of medical fields step back in treating numerous diseases, e.g. in case of a stroke, in favour of a process of thinking. Clinical Pathways, standardized treatment ones, are the basis for such a process-oriented medicine. A clinical pathway named as "Stroke patient within a time frame of 24 h is shown which was developed at the Lausitz University of Applied Sciences and the Lausitz Lakeland Hospital. It has been tested for 3 years now and is based on OPS-Code 8-981 for the first 72 h "Neurological complex treatment of the acute strokeo". This code is fixed in an "Information System Stroke Unit" (IS-SU) which was developed as a co-operational project of the Neurological Hospital of the Dresden Technical University, the Lausitz University of Applied Sciences and the Lausitz Lakeland Hospital. The input surface of the computer represents the treatment pathway in continuous sequence. The IS-SU has a process-controlling and governing function. It forces a stringent case history inquiry, a rational clinical investigation and controls well-chosen para clinical additions. Besides safeguarding the collection of all actual data necessary and also considering concurrent diseases and complications, i.e. the exact process control, the IS-SU enables a structured capture of all findings and selected process data (also 6 h NIHSS). It offers support in finding medical decisions to the physician; e.g. in the case of diagnosis and therapy setting. As part of the launch, at present an established provider is working on the interface questionability concerning common patient information systems. The IS-SU is a potential as an upgrade for a telemedicine integrated system of stroke treatment. It offers additional possibilities for a continuous process regulation and - finally - DRG-accounting control. © Georg Thieme Verlag KG Stuttgart . New York. Source

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