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  • Articles  (545)
  • Engineering  (392)
  • Electrical and Electronics Engineering  (330)
  • nitrogen  (80)
  • air pollution  (74)
  • Electrical Engineering, Measurement and Control Technology  (394)
  • Energy, Environment Protection, Nuclear Power Engineering  (151)
Collection
Source
Keywords
Publisher
Years
Topic
  • 1
    Electronic Resource
    Electronic Resource
    Low-energy electron accelerators for industrial radiation processing
    Amsterdam : Elsevier
    Radiation Physics and Chemistry 42 (1993), S. 525-529 
    Details
    ISSN: 0969-806X
    Keywords: Electron accelerators ; air pollution ; curing ; radiation processing ; trichloroethylene
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0969-806X(93)90302-B
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  • 2
    Electronic Resource
    Electronic Resource
    Application of an ion mobility detector in radiation stimulated plasma chemistry
    Amsterdam : Elsevier
    Radiation Physics and Chemistry 42 (1993), S. 993-996 
    Details
    ISSN: 0969-806X
    Keywords: acceleration ; argon ; beta particles ; drift ; electric field ; electrons ; excited states ; ion mobility ; ions mobility ; nitrogen ; reactive species
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0969-806X(93)90419-U
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  • 3
    Electronic Resource
    Electronic Resource
    The response of spruce shoot aphid Cinara pilicornis hartig to ambient and filtered air at two elevations and pollution climates
    Amsterdam : Elsevier
    Environmental Pollution 86 (1994), S. 233-238 
    Details
    ISSN: 0269-7491
    Keywords: Alps ; Norway spruce ; air pollution ; ozone
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0269-7491(94)90195-3
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  • 4
    Electronic Resource
    Electronic Resource
    Iron content and its relations to the sulphur and titanium contents of epiphytic and terricolous lichens and pine bark in Finland
    Amsterdam : Elsevier
    Environmental Pollution 84 (1994), S. 131-138 
    Details
    ISSN: 0269-7491
    Keywords: air pollution ; bioindicators ; element ratios ; geochemical relations ; heavy metals
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0269-7491(94)90095-7
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  • 5
    Electronic Resource
    Electronic Resource
    Chronic ozone exposure increases the susceptibility of hybrid Populus to disease caused by Septoria Musiva
    Amsterdam : Elsevier
    Environmental Pollution 86 (1994), S. 109-114 
    Details
    ISSN: 0269-7491
    Keywords: air pollution ; canker ; disease ; ozone ; plant
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0269-7491(94)90012-4
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  • 6
    Electronic Resource
    Electronic Resource
    Methods for Detecting and Estimating Population Threshold Concentrations for Air Pollution–Related Mortality with Exposure Measurement Error (1999)
    Springer
    Risk analysis 19 (1999), S. 487-496 
    Details
    ISSN: 1539-6924
    Keywords: Threshold ; measurement error ; mortality ; air pollution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The association between daily fluctuations in ambient particulate matter and daily variations in nonaccidental mortality have been extensively investigated. Although it is now widely recognized that such an association exists, the form of the concentration–response model is still in question. Linear, no threshold and linear threshold models have been most commonly examined. In this paper we considered methods to detect and estimate threshold concentrations using time series data of daily mortality rates and air pollution concentrations. Because exposure is measured with error, we also considered the influence of measurement error in distinguishing between these two completing model specifications. The methods were illustrated on a 15-year daily time series of nonaccidental mortality and particulate air pollution data in Toronto, Canada. Nonparametric smoothed representations of the association between mortality and air pollution were adequate to graphically distinguish between these two forms. Weighted nonlinear regression methods for relative risk models were adequate to give nearly unbiased estimates of threshold concentrations even under conditions of extreme exposure measurement error. The uncertainty in the threshold estimates increased with the degree of exposure error. Regression models incorporating threshold concentrations could be clearly distinguished from linear relative risk models in the presence of exposure measurement error. The assumption of a linear model given that a threshold model was the correct form usually resulted in overestimates in the number of averted premature deaths, except for low threshold concentrations and large measurement error.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007008914354
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  • 7
    Electronic Resource
    Electronic Resource
    Biotechniques for air pollution control (1993)
    Springer
    Biodegradation 4 (1993), S. 283-301 
    Details
    ISSN: 1572-9729
    Keywords: air pollution ; biofiltration ; bioremediation ; bioscrubbing ; off-gas treatment
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Energy, Environment Protection, Nuclear Power Engineering , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract This paper gives an overview of present biological techniques for the treatment of off-gases and the techniques that are being developed at the moment. The characteristics, advantages, disadvantages, costs and application area are discussed and compared. Biological off-gas treatment is based on the absorption of volatile contaminants in an aqueous phase or biofilm followed by oxidation by the action of microorganisms. Biofilters, bioscrubbers and biotrickling filters are used for elimination of odour and bioconvertable volatile organic and inorganic compounds and are enjoying increasing popularity. This popularity is a result of the low investment and operational costs involved compared to physico-chemical techniques and the elimination efficiencies that can be obtained. The operational envelop is still extending to higher concentrations and gas flow rates (exceeding 200,000 m3 h−1) and a broader spectrum of degradable compounds. Research and development on the use of membranes and the addition of activated carbon or a second liquid phase to the biological systems may lead to a more efficient elimination of hydrophobic compounds and buffering of fluctuating loads. Shorter adaptation periods can be obtained by inoculation with specialized microorganisms. Improved design and operation are made possible by the growing insights in the kinetics and microbiology and supported by the development of models describing biological off-gas treatment. In conclusion, biotechniques are efficient and cost effective in treating off-gases with concentrations of biodegradable contaminants up to 1–5 g/m3. They could play a justified and important role in air pollution control in the coming years.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00695975
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  • 8
    Electronic Resource
    Electronic Resource
    Aboveground nitrogen and phosphorus use by five plantation-grown trees with different leaf longevities (1991)
    Springer
    Biodegradation 14 (1991), S. 167-191 
    Details
    ISSN: 1572-9729
    Keywords: leaf longevity ; nitrogen ; nutrient use efficiency ; phosphorus ; requirement ; retranslocation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Energy, Environment Protection, Nuclear Power Engineering , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Aboveground nitrogen (N) and phosphorus (P) requirement, retranslocation and use efficiency were determined for 28-year-old red oak (Quercus rubra L.), European larch (Larix decidua Miller), white pine (Pinus strobes L.), red pine (Pinus resinosa Ait.) and Norway spruce (Picea abies (L) Karst.) plantations on a similar soil in southwestern Wisconsin. Annual aboveground N and P requirements (kg/ha/yr) totaled 126 and 13 for red oak, 86 and 9 for European larch, 80 and 9 for white pine, 38 and 6 for red pine, and 81 and 13 for Norway spruce, respectively. Nitrogen and P retranslocation from current foliage ranged from 81 and 72%, respectively, for European larch, whereas red pine retranslocated the smallest amount of N (13%) and Norway spruce retranslocated the smallest amount of P (18%). In three evergreen species, uptake accounted for 72 to 74% of annual N requirement whereas for two deciduous species retranslocation accounted for 76 to 77% of the annual N requirement. Nitrogen and P use (ANPP/uptake) was more efficient in deciduous species than evergreen species. The results from this common garden experiment demonstrate that differences in N and P cycling among species may result from intrinsic characteristics (e.g. leaf longevity) rather than environmental conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00000806
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  • 9
    Electronic Resource
    Electronic Resource
    A ground water nitrogen budget for a headwater swamp in an area of permanent ground water discharge (1991)
    Springer
    Biodegradation 14 (1991), S. 209-224 
    Details
    ISSN: 1572-9729
    Keywords: ground water ; hydrology ; nitrogen ; mass balance ; nutrient retention ; swamp
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Energy, Environment Protection, Nuclear Power Engineering , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Ground water inputs and outputs of N were studied for a small ground water discharge swamp situated in a headwater drainage basin in southern Ontario, Canada. Darcy's equation with data for piezometers was used to measure inputs of shallow local ground water at the swamp margin and deep regional ground water beneath the swamp. Ground water flux was also quantified by measuring ground water discharge to the outlet stream draining the swamp in combination with a chemical mixing model to separate shallow and deep ground water components based on chloride differences. Estimates of shallow ground water flux determined by these two approaches agreed closely however, the piezometer data seriously underestimated the deep ground water input to the swamp. An average ground water input-output budget of total N (TN) total organic nitrogen (TON) ammonium (NH4 +-N) and nitrate (NO3 --N) was estimated for stream base flow periods which occurred on an average of 328 days each year during 1986–1990. Approximately 90% of the annual NO3 --N input was contributed by shallow ground water at the swamp margin. Deep ground water represented about 65% of the total ground water input and a similar proportion of TON and NH4 +-N inputs. Annual ground water NO3 --N inputs and outputs were similar whereas NH4 +-N retention was 4 kg ha-1 representing about 68% of annual ground water input. Annual TON inputs in ground water exceeded outputs by 7.7 kg ha (27%). The capacity of the swamp to regulate ground water N fluxes was influenced by the N chemistry of ground water inputs and the hydrologic pathways of transport within the swamp.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00000808
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  • 10
    Electronic Resource
    Electronic Resource
    Soil chemistry change in a lowland english deciduous Woodland 1974–1991 (1995)
    Springer
    Water, air & soil pollution 85 (1995), S. 677-682 
    Details
    ISSN: 1573-2932
    Keywords: soils ; acidification ; ancient woodland ; nitrogen ; environmental change
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract This study outlines the results of analysis of soil samples collected from fixed quadrats located in a regular pattern across Wytham Wood. Oxfordshire, England. The site contains plots of mixed deciduous ancient woodland and more recent plantations. A previous soil study was undertaken in 1974 and samples archived. Soils were resampled in 1991 and some re-analysis of the 1974 samples was undertaken. Soils were of a wide range in types from sands to gravels with a pH range of 3.0–7.0. Results showed some decline in pH in lower horizons, but most striking was a large increase in soil nitrogen for all horizons and soil types.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00476907
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