Gravel Bed Rivers

Author: Michael Church
Publisher: John Wiley & Sons
ISBN: 0470688904
Size: 51.17 MB
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Open symbols indicate exposed tracers and closed symbols indicate buried
tracers. Competent flow duration was estimated using published information
about flow duration exceedence frequency in Allt Dubhaig and an individual
hydrograph analysis in Carnation Creek. Published values taken from Hassan (
1990), Haschenburger (2011), and Lenzi (2004), plus original observations for
Allt Dubhaig (R. Ferguson, pers. comm., 2010). Figure 5.4 Exchange probabilities
based on a ...

Tracers In The Oil Field

Author: B. Zemel
Publisher: Elsevier
ISBN: 9780080543147
Size: 29.13 MB
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The old maximum permissible concentrations (MPC) are to be replaced with a
new set of numbers given in appendix B of the proposed regulations as Table 1
for occupationally exposed workers, Table 2 for unrestricted areas, and Table 3
for disposal into the sewer. The values for occupational exposure to some
common waterflood tracers were abstracted from Table 1 above and appear in
Table 2.4 in this chapter. For the first time, these regulations also go into detail on
how the ...

The Use Of Fluorescent Tracers As An Index Of Dermal Exposure To Pesticides

Author: Lowell Ashbaugh
Size: 45.92 MB
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The following factors were felt to be requirements for a suitable tracer : 1. Toxicity-
the material must be non-toxic in terms of dermal, respirable, and gastro-
intestinal exposure. 2. The tracer must be of a similar nature to pesticide in terms
of dermal exposure mechanism; i.e. the transfer properties of the tracer from
foliage to worker must be similar to those of pesticide. 3. The tracer must not
change fluorescence intensity over time, or when exposed to environmental
variables such as ...

Isotope Tracers In Catchment Hydrology

Author: C. Kendall
Publisher: Elsevier
ISBN: 008092915X
Size: 45.74 MB
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The most commonly applied nuclides for erosion rate measurements are 3He,
10Be, 26Al and 36Cl. Until recently, use of these nuclides was restricted to
determining denudation rates of exposed bedrock outcrops; recently, several
research groups have begun to measure nuclide abundances in sediments with
the goal of estimating basin-scale rates of denudation. 19.2.1 Cosmogenic
nuclides in exposed outcrops The abundance of a cosmogenic nuclide in a
sample of outcropping ...

Groundwater Quality

Author: Steven F. Thornton
Publisher: International Assn of Hydrological Sciences
ISBN: 9781901502862
Size: 17.72 MB
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Next, the sorbent is carefully extracted to quantify the mass of all contaminants
intercepted by the flux meter and the residual masses of all resident tracers. The
contaminants' masses are used to calculate time-averaged contaminant mass
fluxes, while residual resident tracer masses are used to calculate cumulative
fluid flux. Depth variations of both water and contaminant fluxes can be measured
in an aquifer from a single flux meter by vertically segmenting the exposed
sorbent ...

Tracer Hydrology 97

Author: A. Kranjc
Publisher: CRC Press
ISBN: 9789054108757
Size: 33.59 MB
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Young daphnia magna are exposed to different dye concentrations prepared with
artificial sweet water. After 24 hours and 48 hours the number of flea that are
unable to swim is evaluated. The pH value and the content of the oxygen is
controlled during the experiment. 3 RESULTS The presented toxicological results
for different tracers are subdivided into human toxicology and ecotoxicology. 3. 1
Human toxicology Fluorescein, as noted above, is widely used in medicine,
where it is ...

Handbook Of Occupational Dermatology

Author: Lasse Kanerva
Publisher: Springer Science & Business Media
ISBN: 9783540640462
Size: 25.12 MB
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dermal exposure patterns and identify the mechanism of skin exposure, and are
also valuable for worker education and training. However, in practice this
technique has a number of limitations: (i) use of tracers requires the introduction
of an additional substance to the production process, (2) the relative transfer of
the substance of interest and the tracers needs to be demonstrated during field
investigations, (3) additional quality-assurance steps may be required during
laboratory ...

Ludwig S Applied Process Design For Chemical And Petrochemical Plants

Author: A. Kayode Coker, PhD
Publisher: Gulf Professional Publishing
ISBN: 0080942423
Size: 37.73 MB
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In SI Units The following equations are used for designing bare and cement heat
tracers respectively [382]: Q = UAAT (15-459) Equations for determining the
different areas across which heat transfer occurs: a = cos' (#) (15-460) r1 + r.) ...
area of tracer exposure to annulus, m* Aal = effective area of annulus exposed to
air, m* Aca = effective area of cement exposed to air, m* Acp = effective area of
cement exposed to process fluid pipe, m* A = effective area of tracer exposed to
air, ...

Nerve Repair

Author: Thomas M. Brushart
Publisher: Oxford University Press
ISBN: 0199721602
Size: 49.39 MB
Format: PDF
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This required two separate tracers that both labeled all of the neurons to which
they were exposed, that could be applied to different tributary nerves and
transported through different pathways to the same parent neuron, and that could
then be co-localized in that neuron (Figure 6-3). The process of simultaneous
double-labeling from distal tributaries A and B of a repaired nerve asks three
questions: (1) Which neurons project their axons only down branch A? (2) What
other neurons ...

The Noble Gases As Geochemical Tracers

Author: Pete Burnard
Publisher: Springer Science & Business Media
ISBN: 3642288367
Size: 23.79 MB
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The extracted gas is then exposed to a hot getter to absorb N2, O2 and other
reactive gases. A detailed overview of different gas extraction techniques can be
found in Landais (2011). 3.1.2 Noble Gases in Particles from Ice Cores The
samples for the pioneering helium isotope analyses of particulate matter in ice
were derived from melting subsections from the GISP-2 and Vostok ice core (
Brook et al. 2000). This technique is the most direct analysis of particulates in ice
cores and has ...