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41.
Dietmar Reinert Tetsuya Kimura Karl-Josef Gorgs 《International journal of occupational safety and ergonomics》2013,19(1):105-115
The authors analysed a proportional valve with electrical position feedback for its failure behaviour. Severalfailures were introduced into the feedback loop, especially into the 2 solenoids and the inductive positiontransducer. The behaviour of the valve for square and ramp reference signals was recorded and systematicallyanalysed. It was shown that failures could be detected by monitoring the residual signal from the equipmentunder control or the residual signal from the sensor. It was possible to achieve the safe position within twice thenormal response time of the valve by switching off the current of both solenoids. The application of these resultsfor a new generation of safe proportional valves is discussed. The use of the results of these investigationsobviates the need for redundancy of the electrical position monitoring arrangement in a safe proportionalvalve. 相似文献
42.
Karim D. Kalache Katarina Lehmann Rabih Chaoui Dietmar E. Kivelitz Stefan Mundlos Rainer Bollmann 《黑龙江环境通报》2002,22(5):404-407
A fetus with thanatophoric dysplasia type 2 (TD2) associated with cloverleaf skull and abnormal development of the corpus callosum is reported. This case represents the first prenatal direct visualization of a partial agenesis of the corpus callosum (ACC) using high-resolution ultrasonography and colour power Doppler, which was confirmed by post-mortem magnetic resonance imaging (MRI). The causal link between cloverleaf skull in TD and partial ACC is discussed. Copyright © 2002 John Wiley & Sons, Ltd. 相似文献
43.
Karlheinz Meffert Dietmar Reinert 《International journal of occupational safety and ergonomics》2006,12(4):347-354
Are we doing the right thing? Are we setting the right priorities for the future in occupational safety and health research? How does BG (Institution for Statutory Accident Insurance and Prevention) research compare nationally and internationally? As a mosaic of answers to these questions, this article explores international research on priorities in occupational research and analyses these against the backdrop of the nearly 1,000 research projects conducted by 9 institutions from 8 countries in the year 2003. 相似文献
44.
Thorsten Zellmann Alexandra S. Bäuerle Dietmar Jahnke 《Environmental Sciences Europe》2000,12(3):163-167
Although problems may occur in the implementation of environmental management systems (EMS) in agriculture, an EMS can be a suitable farm management tool. In the past, pilot projects have revealed that the environmental audit as a base analysis still contains methodical weak points. A uniform procedure for the implementation process is not possible due to variations in the structure of farms in Germany with respect to size, employee structure and capital resources. While the resource costs which occur on larger farms can lead to a benefit due to increased efficiency, this has not yet been established for smaller farms. In these cases, other measures such as the implementation of generic management systems (especially environment and quality) or a farm-specific implementation of a management system without the cost-intensive certification may be a possible alternative. 相似文献
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48.
Dirk F. Wenderoth Petra Rosenbrock Dietmar Pieper Manfred G. Höfle 《Water, Air, & Soil Pollution: Focus》2002,2(3):195-203
A set of microcosm experiments was performed to understand the behaviour of special degraders in bioaugmentation experiments. In the experiments the following chlorobenzene degraders were used: the genetically modified Pseudomonas putida F1CC, and the two wild-type strains Pseudomonas putida GJ31 and Pseudomonas aeruginosa RHO1. These strains were used at an initial cell density of 105 cells mL–1 groundwater which had been spiked with 1,2-dichlorobenzene (1,2-DCB), 1,4-dichlorobenzene (1,4-DCB) and, as main contaminant, chlorobenzene (CB). The population dynamics and behaviour of the three special degraders within the groundwater microcosms were studied by single-strand conformation polymorphism (SSCP) analysis of 16S rDNA fragments amplified from directly extracted community DNA and fluorescent in situ hybridization (FISH) with species-specific probes. RHO1 disappeared after 4 days as detected by FISH in contrast to SSCP-detection where RHO1 could be found during the whole incubation time. Whereas GEM F1CC and wild-type strain GJ31 survived the whole incubation for 20 days. With both methods we were able to detect all strains with high specificity among the indigenous microbial community. The data sets obtained from SSCP analysis and FISH were highly correlated. Specific band intensity within the SSCPfingerprints and the cell counts determined by FISH gave a quantitative overview about the introduced strains. 相似文献
49.
Marc Naguib Roger Mundry Henrike Hultsch Dietmar Todt 《Behavioral ecology and sociobiology》2002,52(3):216-223
In most species of song birds, males develop song repertoires of several different songs. Among this variety, different songs may be used differently in communication and, thus, may have different functions. Here we studied vocal responses to playback of structurally different songs in male territorial nightingales (Luscinia megarhynchos). Nightingales have enormous vocal repertoires of about 200 song types. Among these songs, one category, whistle songs, sticks out syntactically and acoustically. Here we tested whether or not male nightingales match whistle songs with whistle songs and, if so, whether they also match the pitch of the broadcast whistles. Furthermore, we also tested if nightingales treat whistle songs as a separate category of songs. We conducted interactive playback experiments on nocturnal song in which each male received three playback treatments that differed in the number of whistle songs broadcast. Males responded differently during playbacks by singing significantly more whistle songs when the playback tapes contained many whistle songs than when they contained no whistle songs. Males also frequently matched the pitch of the broadcast whistle songs. In contrast to responses during playback, after the playback terminated males sang more whistle songs when no whistle songs were broadcast than when many whistle songs were broadcast. These findings suggest that whistle songs have a specific signal value and that nightingales treat them as a special song category. Electronic supplementary material to this paper can be obtained by using the Springer Link server located at http://dx.doi.org/10.1007/s00265-002-0511-1. 相似文献
50.
Jürgen Maguhn Helmut Selinger Alexander Ziegler-Jöns Dietmar Knoppik 《Environmental Sciences Europe》1994,6(3):123-130
The effect of short-time fumigation with the peroxidic photooxidants ozone, peroxyacetyl nitrate (PAN), and hydrogen peroxide (H2O2) on the gas exchange of wheat leaves was investigated. Two types of experiments are to be distinguished:
- Fumigation is carried out at atmospheric CO2 partial pressure (350 μbar) and the assimilation and transpiration rates are followed simultaneously.
- The alteration of CO2-response curves by fumigation is determined; from this, characteristic photosynthetic parameters can be calculated.