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  • 1985-1989  (15)
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  • 1
    Electronic Resource
    Electronic Resource
    PERFORMANCE AND ANALYSIS OF AQUIFER TRACER TESTS WITH IMPLICATIONS FOR CONTAMINANT TRANSPORT MODELING–A PROJECT SUMMARY (1987)
    Oxford, UK : Blackwell Publishing Ltd
    Ground water 25 (1987), S. 0 
    Details
    ISSN: 1745-6584
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
    Notes: The scale-dependence of dispersivity values used in contaminant transport models to estimate the spreading of contaminant plumes by hydrodynamic dispersion processes was investigated and found to be an artifact of conventional modeling approaches (especially, vertically averaged parameters in two-dimensional plume simulations). The work reported here shows that variations in hydraulic conductivity with depth result in significant variations in ground-water flow and contaminant transport velocities; it is the resulting velocity variations that, if vertically averaged, give rise to apparent scale-dependency of dispersion (e.g., increased dispersion with increasing travel distance). Special depth-selective observation well designs are recommended by the authors for use in tracer tests, so that detailed estimates of the variations in hydraulic conductivity, and flow and transport velocities can be obtained. Innovative modeling techniques that take advantage of the detailed information obtainable from such tests (by emphasizing advective transport, as opposed to dispersive transport), have been developed by the authors. These modeling techniques are shown to have an element of true predictive ability, being able to closely simulate actual results with little or no calibration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1745-6584.1987.tb02138.x
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  • 2
    Electronic Resource
    Electronic Resource
    DISCUSSION OF “A Radial Injection Tracer Experiment in a Confined Aquifer, Scarborough, Ontario, Canada” by Carl D. Palmer and Robert L. Nadon (1986)
    Oxford, UK : Blackwell Publishing Ltd
    Ground water 24 (1986), S. 0 
    Details
    ISSN: 1745-6584
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1745-6584.1986.tb01680.x
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  • 3
    Electronic Resource
    Electronic Resource
    Forced-Gradient Tracer Tests and Inferred Hydraulic Conductivity Distributions at the Mobile Site (1988)
    Oxford, UK : Blackwell Publishing Ltd
    Ground water 26 (1988), S. 0 
    Details
    ISSN: 1745-6584
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
    Notes: Four single-well tracer tests and a two-well tracer test performed in a 21-m thick confined granular aquifer at a field site near Mobile, Alabama, are described. The data from these tests together with previously published data from a single-well test and a two-well test allow one to begin to develop a three-dimensional picture of the hydraulic properties of the study aquifer. A consistent feature of all the tests is a high hydraulic conductivity zone which appears in the bottom third of the aquifer. This result is in agreement with hydraulic conductivity distributions inferred from previous aquifer thermal energy storage experiments at the same site. In some locations the new tests indicated high hydraulic conductivity zones in the upper third of the aquifer which were not detected in the previous two-well test and single-well tests performed at the same site but at different locations. Despite the three-dimensional spatial variations of hydraulic conductivity indicated by these tests, it was possible to predict the major features of the tracer concentration as a function of time at the withdrawal well in the two-well test by means of an available numerical model assuming perfect stratification at the test site and using a hydraulic conductivity distribution inferred from a single-well test.The apparent success of the model prediction presented here, as well as the success of a similar numerical simulation of the previous two-well test reported earlier, seem to support the conclusion that the study aquifer has an approximately stratified flow field at the test site. These field test results provide further evidence that reliable predictions of solute transport in a real aquifer will depend on a sufficiently detailed knowledged of the major features of the three-dimensional advection pattern in the aquifer. Based on this study and previous studies, it appears that a healthy mixture of viewpoints and techniques (geologic, hydrologic, geophysical, etc.) will be necessary to characterize the transport properties of natural ground-water systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1745-6584.1988.tb00790.x
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  • 4
    Electronic Resource
    Electronic Resource
    A Simplified Analysis of Two-Well Tracer Tests in Stratified Aquifers (1986)
    Oxford, UK : Blackwell Publishing Ltd
    Ground water 24 (1986), S. 0 
    Details
    ISSN: 1745-6584
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
    Notes: This paper illustrates several interesting effects of aquifer stratification on the results of two-well tracer tests by means of a simplified computer model. In the model, it is assumed that the aquifer is horizontal, confined, of constant thickness and porosity, and perfectly stratified in the vicinity of the test wells. The nonuniform advection pattern is taken into account in detail by the model, but the local hydrodynamic dispersion is completely neglected. This simplified model has been verified in part by comparisons with available analytical solutions valid for homogeneous aquifers and in part by comparisons with the results of a two-well field experiment of Pickens and Grisak (1981a) which was performed in a locally stratified aquifer. The applications of the model to several field situations with assumed values of the relevant parameters show that the concentration versus time breakthrough curve measured at the withdrawal well during a standard two-well test would be very sensitive to variations of the hydraulic conductivity in the vertical. Without the use of supplementary observation wells with isolated multilevel sampling points, the standard test would give little useful information about the hydraulic and dispersive characteristics of an aquifer. Factors such as the length of the tracer injection period, the use of recirculation and the physical size of the experiment all have a strong effect on the breakthrough curve measured at the withdrawal well, making the interpretation of field results difficult unless aquifer stratification is measured and properly taken into account.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1745-6584.1986.tb01460.x
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  • 5
    Electronic Resource
    Electronic Resource
    Laboratory Investigation and Analysis of a Ground-Water Flowmeter (1985)
    Oxford, UK : Blackwell Publishing Ltd
    Ground water 23 (1985), S. 0 
    Details
    ISSN: 1745-6584
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
    Notes: The ground-water flowmeter system, model 3OL, manufactured by K-V Associates Inc., Falmouth, Massachusetts was tested under controlled laboratory conditions. The influence of slotted pipe schedule, slot orientation, backfill materials, endcap bags, isolated regions of high hydraulic conductivity, and channelization near the slotted pipe wall was measured. The physical concept of the flow-meter in an ideal configuration was analyzed, and with the aid of an analytical model, the significance of the thermal and hydraulic characteristics of the aquifer and backfill materials is clarified. Results indicate that the basic instrument response is linear, consistent, and predictable qualitatively in a laboratory environment. Analysis and measurements show clearly that very small channelization around a slotted pipe casing or between the slotted pipe and the probe endcap can invalidate the instrument response. Additional potential complications arise due to unknown permeability contrasts between the aquifer matrix and the material used to backfill around the probe.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1745-6584.1985.tb01498.x
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  • 6
    Electronic Resource
    Electronic Resource
    In-beam study of 63 143 Eu80 (1988)
    Springer
    The European physical journal 330 (1988), S. 343-344 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract An in-beam γ-ray study with the144Sm (α, p4n) reaction has established the high-spin states up to 5 MeV excitation and I=35/2 in the N=80 nucleus143Eu. The observed yrast states show the typical irregular pattern of a spherical nucleus, with frequent decay branchings and often dominant dipole de-excitation. The level spectrum is in qualitative accord with the coupling of the h11/2 proton particle to the known yrast levels of the142Sm core nucleus. Only in a few cases specific configuration assignments are made.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01294881
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  • 7
    Electronic Resource
    Electronic Resource
    Proton- and neutron H11/2 excitations in 63 141 Eu78 (1988)
    Springer
    The European physical journal 330 (1988), S. 437-438 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract An (α,p6n) in-beam γ-ray experiment has established the high-spin states of the N=78 nucleus141Eu up to I=35/2− at 4.4 MeV excitation. The levels above 3 MeV involve the couplings of the h11/2 valence proton to either two aligned h11/2 proton particles or two aligned h11/2 neutron holes. The observed spin sequences are in accord with the shell model for these couplings.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01290132
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  • 8
    Electronic Resource
    Electronic Resource
    Gamow-teller strength and particle-phonon states in149Dy from decay of its 11/2− and l/2+ 149Ho parents (1989)
    Springer
    The European physical journal 334 (1989), S. 525-526 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Studies of the149Ho 11/2− and 1/2+ GT-decays using on-line mass separation have established in the N=83149Dy nucleus the single neutron excitations below 1.8 MeV and members of the νf7/2×3− and νf7/2×2+ particle-phonon multiplets. Quantitative analysis of the GT-decay strength to149Dy 1qp- and 3qp-states is made in terms of the strength values measured in149Dy0 and147Tb11/2− decay.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01294765
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  • 9
    Electronic Resource
    Electronic Resource
    Thermal stability of poly(pyrrole) (1987)
    Springer
    Journal of materials science 6 (1987), S. 1013-1015 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01729116
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  • 10
    Electronic Resource
    Electronic Resource
    Determination of diffusion coefficient of oxygen into polymers by using electron spin resonance spectroscopy. I. Poly(methyl methacrylate) (1989)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 37 (1989), S. 2577-2585 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: A simple technique has been proposed for the measurement of the diffusion coefficient of oxygen into polymeric spheres. The technique is based on the scavenging of radicals produced by high energy radiation by oxygen. The diffusion coefficient of oxygen determined for poly(methyl methacrylate) has shown an inverse dependency on the dose received. Diffusion coefficient determined for low doses (D = 3.4 × 10-8 cm2/s) as well as that determined after extrapolation to zero dose (D0 = 3.7 × 10-8 cm2/s) are in excellent agreement with the values reported in the literature.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1989.070370910
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