172 research outputs found
Requirements to Testing of Power System Services Provided by DER Units
The present report forms the Project Deliverable âD 2.2â of the DERlab NoE project, supported by the EC under Contract No. SES6-CT-518299 NoE DERlab. The present document discuss the power system services that may be provided from DER units and the related methods to test the services actually provided, both at component level and at system level
UV-induced carbon monoxide emission from sand and living vegetation
The global burden of carbon monoxide (CO) is rather uncertain. In this paper
we address the potential for UV-induced CO emission by living terrestrial
vegetation surfaces. Real-time measurements of CO concentrations were made
with a cavity-enhanced laser spectrometer connected in closed loop to either
a chamber on a field of grass or a plant-leaf scale chamber. Leaves of all
plant species that were examined exhibited emission of CO in response to
artificial UV radiation as well as the UV component of natural solar
radiation. The UV-induced rate of CO emission exhibited a low dependence on
temperature, indicating an abiotic process. The emission of CO in response to
the UV component of natural solar radiation was also evident at the natural
grassland scale
Survival in patients with synchronous liver metastases in central and northern Denmark, 1998 to 2009
The influence of grain legume and tillage strategies on co2 and n2o gas exchange under varied environmental conditions
By this in vitro study addressing greenhouse gas (GHG) emissions from soil-plant mesocosms, we suggest a method to investigate the joint effects of environmental conditions, growth of plants, and agricultural soil management. Soils from two long-term agricultural trials in France were placed in climate chambers. The rotation trial was with or without grain legumes, and the tillage trial used plowing or reduced tillage. Environmental conditions consisted of two contrasting temperature regimes combined with ambient (400 ppm) or high (700 ppm) CO2 concentrations in climate chambers. The plant growth went from seeding to vegetative growth. Carbon dioxide gas exchange measurements were conducted in both soil types for a period representing initial plant growth. The CO2 exchange was influenced by the growing plants increasing the mesocosm respiration and gross ecosystem production. The environmental settings had no noticeable impact on the CO2 exchange in the soils from the legume trial. The CO2 exchange from the tillage trial soils exhibited variations induced by the environmental conditions depending on the tillage treatment. The N2O emission measurements in the legume trial soils showed little variability based on rotation, however, in soils with legumes, indications that higher temperatures will lead to more N2O emission were seen
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