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  • 1
    Electronic Resource
    Electronic Resource
    Reactions of diatomic ions with surfaces. 3. Model for interactions of heteronuclear cation beams with elemental surfaces (1985)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 89 (1985), S. 2751-2757 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100259a010
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Creation of an Artificially Produced Fracture Zone to Prevent Contaminated Ground-Water Migration (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Ground water 27 (1989), S. 0 
    Details
    ISSN: 1745-6584
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
    Notes: Recovery of contaminated ground water in a fractured bedrock system presents some unique problems. Typically, the most common problem occurs from the inability to adequately characterize the discrete fractures through which contaminants may be migrating. Without adequate characterization, difficulties arise in properly positioning recovery wells and verifying the performance of the system. To overcome these difficulties at a site in Upstate New York, an innovative approach was developed involving the creation of an artificial fracture zone through controlled blasting to intercept contaminated ground-water flow.Site investigations delineated the extent of a ground- water contamination plume migrating within a fractured bedrock aquifer (Medina sandstone) which underlies approximately 15 ft of glacial till. A 72-hr aquifer test involving one recovery well resulted in a low yield (3.5 gpm with 20 ft of drawdown). Data collected from adjacent observation wells indicated poor interconnection among the naturally occurring fractures. Although the response of some observation wells mirrored that of the recovery well, others showed little or no response to pumping. Therefore, achieving the corrective action objectives (i.e., preventing further contaminant migration and removing and treating contaminated ground water) would be difficult using a “traditional” multiple recovery well system. It was decided that controlled linear blasting could provide the enhanced fracture interconnection necessary to successfully intercept the contaminated ground-water plume, which would then be captured and removed by judicious placement of recovery well(s) installed within the fracture zone.Using a carefully controlled single line pattern blasting technique, a 6-ft wide, 300-ft long fracture zone was created in the upper 25 ft of the bedrock aquifer perpendicular to the centerline of the plume. Following fracturing, a second 72-hr aquifer test was conducted at the same location and under conditions similar to the first test. The second test indicated that the single recovery well located in the newly created fracture zone should be fully capable of recovering contaminated ground water and preventing further migration of the plume. The recovery well produced a substantially higher yeild of 18.5 gpm with only 11.2 ft of drawdown. Futhermore, all of the nearby observation wells showed significant response to pumping.Success at this site is promising, and the approach may prove useful at other sites involving contaminated bedrock aquifers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1745-6584.1989.tb00008.x
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  • 3
    Electronic Resource
    Electronic Resource
    Organochlorine concentrations in Laurentian Great Lakes salmonines: Implications for fisheries management (1993)
    Springer
    Archives of environmental contamination and toxicology 25 (1993), S. 212-219 
    Details
    ISSN: 1432-0703
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Notes: Abstract To assess species-specific differences in organochlorine (OC) concentrations and sport harvest of Lake Michigan salmonines, and how this may affect human exposure to OC compounds, creel survey and OC analysis data for salmon and trout collected from the western waters of Lake Michigan in 1985 and 1990 were examined. In all species, total concentrations of polychlorinated biphenyls (PCBs) attained the highest concentration of the OC compounds quantified in both study years. DDT and metabolites attained the second highest concentration of OC compounds, in those species in which these compounds were quantified, followed by chlordane and its constituents and dieldrin, respectively. The relative concentrations of PCBs and OC pesticides remained constant between study years in all species, except for brook trout as limited 1990 data prevented analysis. For the mean lengths of each species of salmonines taken by anglers in 1985, lake trout showed the highest concentrations of OC compounds followed by brown trout, chinook salmon, brook trout, rainbow trout, and coho salmon, respectively. In 1990 lake trout again had the highest concentration of OCs followed by chinook salmon, brown trout, rainbow trout, and coho salmon. Brook trout were not in the analysis. Chinook salmon contributed the greatest proportion of OCs to the 1985 sport catch because of its dominance in total biomass of fish harvested. Lake trout contributed the greatest proportion of OCs to the 1990 sport catch, although the second highest in biomass harvested, because of the higher concentration of OC compounds in this species. The concentrations of PCBs declined between study years in all species except brook trout becaused limited 1990 data prevented this comparison. Study results indicate salmonine stocking policies can significantly influence the exposure of sport fish consumers in the Great Lakes region to OC compounds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00212132
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  • 4
    Electronic Resource
    Electronic Resource
    Osseous implant for studies of biomaterials using an in vivo electrochemical transducer (1993)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 27 (1993), S. 763-773 
    Details
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: The in vitro and in vivo electrochemical behavior of commercially pure titanium (cp Ti) was characterized using a specialized osseous implant in conjunction with electrochemical impedance spectroscopy (EIS) measurement techniques. Studies performed in vitro were used to verify the operation of the transducer and develop methods of deconvoluting EIS data. This method was subsequently used to describe an electrochemical equivalent circuit model of the surface oxide and electrical doublelayer capacitance of cp Ti in the endogenous electrolyte found in the medullary compartment of a baboon tibia. Kinetic profiles of the double-layer capacitance and the polarization resistance were constructed from multiple in vitro and in vivo EIS measurements performed over 60 min at 0 V (reference Ag/AgCI) conditioning potential. The profiles demonstrated that the growth of surface oxides was biphasic, with rapid decrease in the doublelayer capacitance occurring within 20 min and reaching steady-state conditions at approximately 40 min. These data suggested that a passive, stable biofilm formed on the cp Ti surface in vivo and in vitro. © 1993 John Wiley & Sons, Inc.
    Additional Material: 15 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jbm.820270609
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