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  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Analytical chemistry 25 (1953), S. 1231-1235 
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Analytical chemistry 24 (1952), S. 1632-1634 
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-0495
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Chemical analyses of 21 water samples from the Firehole and Gibbon Rivers, which combine to form the Madison River, gave arsenic and fluoride values above the Environmental Protection Agency Interim Primary Drinking Water maximum contaminant levels (0.05 mg/l arsenic and 2.0 mg/l fluoride). On 18 October, 1975, during a period of moderate flow (16,600 l/s), the Madison River at West Yellowstone contained 0.23 mg/l arsenic and 6.2 mg/l fluoride. Below Hebgen Lake the Madison River during periods of high flow (56,000 liter/s at West Yellowstone and 708,000 liter/s below Hebgen Lake) would contain 0.05 mg/l arsenic at both stations and 1.5 and 4.0 mg/l fluoride at West Yellowstone and below Hebgen Lake, respectively. The strong correlations of arsenic and fluoride with other chemical constituents of the river water at the sampling sites demonstrate the conservative nature of each element after it reaches the Madison River system. Calculations indicate that water from three sampling sites is above saturation with respect to fluorite.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 138 (1936), S. 802-803 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] BY comparing experimental heats of formation with bond energies derived from compounds without alternative Lewis structures, Pauling and Sherman1 deduce resonant structures for carbon dioxide, carbonyl sulphide, and carbon disulphide, of the type: ... but the impossibility of ...
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 254 (1975), S. 392-395 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Two new theories of evolutionary instability are outlined. When applied to highly optimised engineering structures, they predict that buckling strengths can be dramatically eroded by small unavoidable manufacturing imperfections: this is confirmed by tests on stiffened panels of box-girder bridges. ...
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 5 (1993), S. 2315-2316 
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The dam breaking problem in terms of changing water levels behind and ahead of the dam, has been solved in the shallow water model. Here the effect of dam breaking on a symmetric downstream floating body is considered. A forced Duffing equation model, proposed by one of the authors, is used. The analysis has practical implications in terms of how far a marina should be situated from a large dam. Comparison with basin erosion, as caused by a water surface soliton, is instructive.
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  • 7
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 316 (1979), S. 0 
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1432-0827
    Keywords: Key words: Postmenopausal women — Chronic — Steroid — Estrogen — Osteoporosis — Predictors.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Abstract. Chronic steroid use results in osteoporosis, and postmenopausal women are believed to be at a high risk for steroid-induced bone loss. The purpose of this study was to determine predictors of bone mineral density (BMD) in postmenopausal women on both chronic steroid and hormone replacement therapy. Seventy-six postmenopausal women (≥3 years postmenopausal, ≥2 years of steroid treatment of ≥5 mg/day of prednisone, and ≥1 year of hormone replacement therapy) were recruited into this study. Measurements of BMD of the lumbar spine and femoral neck were obtained in all subjects. Risk factors for osteoporosis were obtained by questionnaire. Discriminant analysis was performed to determine predictors of BMD. Osteoporosis, defined by a T score of 〈−2.5, was present in the lumbar spine or femoral neck in 34 of the 76 subjects. Based on these criteria, women with osteoporosis were significantly older, were more years postmenopausal, and had a lower body mass index (BMI) than women who did not have osteoporosis. Predictors of osteoporosis for both the femoral neck and spine included a low BMI (P 〈 0.05), more years postmenopausal (P 〈 0.01), and more years on steroids (P 〈 0.01). Low BMI was the only significant predictor of osteoporosis in the lumbar spine (P 〈 0.05), whereas for the femoral neck both years on steroids (P 〈 0.05) and BMI (P 〈 0.05) were significant predictors of low BMD. In summary, not all postmenopausal women on chronic steroid and hormone replacement therapy are osteoporotic but a low BMI, more years on steroids, and more years postmenopausal were significant predictors of osteoporosis in these subjects.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 296 (1982), S. 135-137 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Suppose we are given a black box with a tray hanging beneath it. We add a small mass m to the tray, and it rises a small ce h: we add a second mass m and it rises a further distance h. To our surprise, we find that we can plot a complete stable load-deflection curve with negative stiffness using ...
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  • 10
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 260 (1976), S. 598-599 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The original cusp was associated with an unstable symmetric point of bifurcation6 encountered by a close packed crystal with Lennard?Jones interatomic potentials subjected to a uniaxial tensile stress s11. Under this stress the lattice follows a primary equilibrium path involving a direct strain ...
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