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Search Results: 1 - 10 of 86 matches for " Friedhelm Schwonke "
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Airborne Thermal Data Identifies Groundwater Discharge at the North-Western Coast of the Dead Sea
Ulf Mallast,Friedhelm Schwonke,Richard Gloaguen,Stefan Geyer,Martin Sauter,Christian Siebert
Remote Sensing , 2013, DOI: 10.3390/rs5126361
Abstract: A qualitative and quantitative monitoring of groundwater discharge was conducted based on an airborne thermal campaign undertaken along the north-western coast of the Dead Sea in January 2011 to contribute to the relatively scarce information on groundwater discharge to date in the region. The application of airborne thermal data exploits thermal contrasts that exist between discharging groundwater and background sea surface temperatures of the Dead Sea. Using these contrasts, 72 discharge sites were identified from which only 42 were known from previous in situ measurements undertaken at terrestrial springs by the Israel Hydrological Service. Six of these sites represent submarine springs and at a further 24 locations groundwater appears to seep through the sediment. Although the abundance of groundwater seepage sites suggests a significant, but so far unknown groundwater source, the main contribution appears to originate from terrestrial springs. In an attempt to provide a quantitative approach for terrestrial springs, a linear bootstrap regression model between in situ spring discharge and respective thermal discharge plumes (r 2 = 0.87 p < 0.001) is developed and presented here. While the results appear promising and could potentially be applied to derive discharge values at unmonitored sites, several influence factors need to be clarified before a robust and reliable model to efficiently derive a complete quantitative picture of groundwater discharge can be proposed.
Diversity and equity: dealing with biological and social differences
Revista de Saúde Pública , 2004, DOI: 10.1590/S0034-89102004000700012
Abstract: in the context of the design of working hours inequities in health associated with biological, psychological, social, and socioeconomic diversities can be observed. the paper first tries to set up a frame of reference for a discussion of this topic, relating to the universal declaration of human rights and some recent discussions on equity in health and then goes into some factors that produce inequities in health in the context of the design of working hours, dealing with sex or gender, age and job age, personality traits, marital status, social support, diversities in values, and socio-economic differences; the discussion deals with approaches on how to deal with these differences and inequities.
SFX und der Weg zum Volltext - Erfahrungen an der Bibliothek der Tier rztlichen Hochschule Hannover
Rump, Friedhelm
GMS Medizin-Bibliothek-Information , 2006,
Neues aus der EAHIL
Rump, Friedhelm
GMS Medizin-Bibliothek-Information , 2009,
Neues von der EAHIL: European Association for Health Information and Libraries
Rump, Friedhelm
GMS Medizin-Bibliothek-Information , 2007,
The "Alibi-Function" of Social Indicators in Social Planning
Friedhelm Gehrmann
Philosophica , 1980,
On the Generation of X-Ray Photon Pairs: A Verification of the Unruh Effect?
Friedhelm Bell
Physics , 2008,
Abstract: We investigate the production of entangled X-ray photons by incoherent double Compton scattering (IDCS) which seems to be an interesting alternative to coherent double Compton scattering used in earlier work. Very recently it has been proposed to use the Unruh effect as a source for photon pairs (R.Sch\"utzhold et al.,Phys.Rev.Lett. 100, 091301 (2008)). We will discuss this mechanism in comparison with inverse IDCS.
Using Sequential Injection Analysis to Improve System and Data Reliability of Online Methods: Determination of Ammonium and Phosphate in Coastal Waters
Carsten Frank,Friedhelm Schroeder
Journal of Analytical Methods in Chemistry , 2007, DOI: 10.1155/2007/49535
Abstract: This article summarises the advantages of the sequential injection analysis (SIA) for the online determination of nutrients in coastal waters. It concentrates on techniques to improve the reliability of the gained data by continuously monitoring one or more standards and on the advantages of online standard additions and offline determination of manually collected samples with the online SIA system. These measures are advantageous during method development and validation and can be used to verify the system performance on a regular base to reduce the amount of erroneous results. No changes in the flow system are necessary and the sample throughput is only slightly reduced. These techniques have been applied to a SIA system which is able to simultaneously determine ammonium and phosphate at a rate of more than 100 samples per hour each and detection limits (3σ) of 0.06 μM and 0.05 μM. Results from a campaign in summer 2005 are shown.
Health and psychosocial effects of flexible working hours
Janssen,Daniela; Nachreiner,Friedhelm;
Revista de Saúde Pública , 2004, DOI: 10.1590/S0034-89102004000700003
Abstract: objective: to examine whether any impairments in health and social lives can be found under different kinds of flexible working hours, and whether such effects are related to specific characteristics of these working hours. methods: two studies - a company based survey (n=660) and an internet survey (n=528) - have been conducted. the first one was a questionnaire study (paper and pencil) on employees working under some 'typical' kinds of different flexible working time arrangements in different companies and different occupational fields (health care, manufacturing, retail, administration, call centres). the second study was an internet-based survey, using an adaptation of the questionnaire from the first study. results: the results of both studies consistently show that high variability of working hours is associated with increased impairments in health and well-being and this is especially true if this variability is company controlled. these effects are less pronounced if variability is self-controlled; however, autonomy does not compensate the effects of variability. conclusions: recommendations for an appropriate design of flexible working hours should be developed in order to minimize any impairing effects on health and psychosocial well-being; these recommendations should include - besides allowing for discretion in controlling one's (flexible) working hours - that variability in flexible working hours should be kept low (or at least moderate), even if this variability is self-controlled.
In vitro interleukin 4 and interferon-gamma production by mononuclear cells from atopic dermatitis patients
Serge Well,Friedhelm Diel
Mediators of Inflammation , 1993, DOI: 10.1155/s0962935193000584
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