Search results for: F. Brauer
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Environmental and Molecular Mutagenesis > 53 > 3 > 185 - 197
An international round‐robin study on the Ames fluctuation test [ISO 11350, 2012], a microplate version of the classic plate‐incorporation method for the detection of mutagenicity in water, wastewater and chemicals was performed by 18 laboratories from seven countries. Such a round‐robin study is a precondition for both the finalization of the ISO standardization process and a possible regulatory...
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Intentional electromagnetic interferences (IEMI) have become a threat to various kinds of technical applications. Different high power electromagnetic (HPEM) sources may cause a disruption or destruction of complex electronic systems like communications systems. Even a temporary breakdown of the data transfer is very critical in some applications. In this contribution a COTS IT network system is investigated...
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This paper describes measurements to show possible non lineraties of different bandpass filters which can be used in the 2.4 GHz ISM band. Interdigital filters of different PCB materials and a commercial surface acoustic wave (SAW) filter have been investigated. With the use of the linear Fourier transformation of applied UWB pulses to these filters, the transfer function has been calculated and compared...
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For the development and protection of electronic systems, which may be used in a high power electromagnetic (HPEM) environment, the behavior concerning the coupling of electromagnetic pulses is of special interest. Due to the use of different PCB materials, especially for RF applications, the influence of the used substrates on the coupling behavior of HPEM pulses for microstrip lines is investigated...
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Data transactions between business partners often include unstructured data such as invoices or purchase orders. In order to process such automatically, complex business entities need to be identified. Examples for complex entities are products, business partners and purchase orders which are stored in a supplier relationship management system. Both, structured records in the enterprise system and...
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Human perception of Voice- and Video-over-IP connection quality is influenced by a lot of factors, first of all the network conditions like packet loss rate, delay and jitter but also others like the hard- and software (speech or video codec) in use. In this paper an experimental setup is developed which allows adjustment of certain network parameters to study their impact on the perceived conversational...
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Recent research in the area of ubiquitous computing lead to innovative technologies for acquisition, storage and communication of real-world information, resulting in a multitude of so called ??smart items??. Prominent examples for that are RFID and wireless sensor nodes. Key to everaging the full power of these items is to embedd them into a system architecture. In this paper we present such an architecture...
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The investigation of the noise immunity of systems and the behavior of protection circuits against ultra wideband (UWB) signals require conducted test pulses. A concept to produce these UWB pulses is presented in this contribution. With this method injected UWB signals with high repetition rates of 1 MHz and above are to be realized in hardware.
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Mathematical and Computer Modelling > 2004 > 40 > 13 > 1491-1506
Severe acute respiratory syndrome (SARS) is a rapidly spreading infectious disease which was transmitted in late 2002 and early 2003 to more than 28 countries through the medium of international travel. The evolution and spread of SARS has resulted in an international effort coordinated by the World Health Organization (WHO).We have formulated a discrete mathematical model to investigate the transmission...
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Mathematical and Computer Modelling > 2000 > 31 > 4-5 > 11-15
In modelling sexually transmitted diseases, it is standard to divide the population into a very active core group and a larger but much less active noncore group. Transitions between these two groups may be affected by the prevalence of disease in the core group. There may be a time-lag in this effect, and we explore the relation between such a time-lag and the stability of an endemic equilibrium.
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Wir operierten einen 22jhrigen Patienten mit der Verdachtsdiagnose mediane Halszyste. berraschenderweise fand sich histopathologisch in der Zyste dystopes papillres Schilddrsengewebe, welches eine karzinomatse Entartung aufwies. Bisher wurden weltweit nur ca. 150 Flle von Schilddrsenkarzinomen in einer medianen Halszyste beschrieben. Nach totaler Thyreoidektomie und funktioneller neck dissection beidseits...
