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  • 1
    Electronic Resource
    Electronic Resource
    Hyperfine transitions and fusion in flight via the Faddeev approach (1996)
    Springer
    Hyperfine interactions 101-102 (1996), S. 337-347 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The Faddeev approach, modified for long-range Coulomb forces, is used to study the s-wave scattering states of the muonic atomic systems p+pµ, d+dµ, t+tµ, t+dµ and d+tµ. Elastic and hyperfine-transition cross sections of p+pµ are calculated with and without the hyperfme splitting. Fusion-in-flight reactions are studied. A sharp resonance of the rate of fusion-in-flight is observed for d+tµ atE=76.3 eV. A similar resonance-like behavior of the fusion-in-flight is also obtained in the symmetric mesic atomic collisions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02227642
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Differences and similarities in cardenolide contents of queen and monarch butterflies in florida and their ecological and evolutionary implications (1985)
    Springer
    Journal of chemical ecology 11 (1985), S. 85-103 
    Details
    ISSN: 1573-1561
    Keywords: Danaus gilippus ; Danaus plexippus ; Lepidoptere ; Danaidae ; cardiac glycosides ; cardenolides ; Asclepias ; Asclepiadaceae ; allelochemics ; plant secondary chemistry ; chemical ecology ; chemical defense ; mimicry ; Limenitis archippus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Florida queen butterflies are highly variable in cardenolide content and, in three populations studied, contained less cardenolide than did a sample of sympatric Florida monarchs. The possibility that queens stored a more potent set of cardenolides from their host plants (and therefore were as well protected as monarchs, even at lower concentrations) is refuted by Chromatographic analysis of wild butterflies, as well as controlled laboratory rearings. It therefore appears that, with respect to cardenolides, monarchs are better defended than are queens. Consequently, cardenolides are unlikely to explain the apparent shift in Florida viceroy mimicry away from resemblance of the monarch, toward mimicry of the queen. Other hypotheses to explain this mimetic phenomenon are suggested. Adult monarchs exhibit significant negative correlations between the concentration of cardenolide stored in their tissues and both body size and weight, whereas queens show no such correlations. The implications of these results for the study of “metabolic costs” of allelochemic storage are discussed. Chromatographic evidence is provided that monarchs do breed in south Florida during the winter months and that the likely host plant employed by the population studied wasAsclepias curassavica. This represents the first practical application of cardenolide “fingerprinting” to identify the larval host plants of wild danaid butterflies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00987608
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  • 3
    Electronic Resource
    Electronic Resource
    Cardenolide sequestration by the dogbane tiger moth (Cycnia tenera; Arctiidae) (1983)
    Springer
    Journal of chemical ecology 9 (1983), S. 521-532 
    Details
    ISSN: 1573-1561
    Keywords: Cycnia tenera ; Arctiidae ; Lepidoptera ; Asclepias ; milkweeds ; cardenolides ; cardiac glycosides ; allelochemics ; plant-insect interactions ; plant secondary chemistry ; chemical ecology ; chemical defense ; kin selection
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Cycnia tenera adults, reared as larvae onAsclepias humistrata, had 10 times higher cardenolide concentrations, and contained 15 times more total cardenolide, than did moths reared onA. tuberosa. Thin-layer chromatography confirmed that each individual cardenolide visualized in the adult moths reared on the former host plant corresponds to one present in the plant, thus demonstrating that the insects' cardenolides are indeed derived from the larval food. Adult weights were significantly greater when the larvae had been fed upon the higher cardenolide plant species,A. humistrata. Similar results for other milkweed-feeding insects have been interpreted by some authors as evidence against a metabolic cost of handling cardenolides. However, such interpretations confound cardenolide differences among milkweed species with other differences in plant primary and secondary chemistry that affect insect growth and development. While the cooccurrence inC. tenera of other noxious chemicals (e.g., alkaloids) is not precluded, cardenolides sequestered from larval host plants have probably contributed to the evolution of visual and auditory aposematism in this species. As the eggs are laid in large clutches and larvae are gregarious, such aposematism may have evolved via kin selection.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00990224
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  • 4
    Electronic Resource
    Electronic Resource
    Calculation of sticking using theR-matrix method with the Bloch operator (1996)
    Springer
    Hyperfine interactions 101-102 (1996), S. 349-358 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We calculate the effects of nuclear forces on the sticking in muon-catalyzed d-t fusion using theR-matrix method. The importance of the Bloch operator in this calculation is emphasized. We try to clarify some features in the formulation that seem to have caused confusion in the past. Some speculations are made regarding the remaining discrepancy of the calculated sticking with experimental values.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02227643
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  • 5
    Electronic Resource
    Electronic Resource
    Collisional problems in the μCF cycle before muonic molecule formation (1993)
    Springer
    Hyperfine interactions 82 (1993), S. 15-30 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Important processes in the muon-catalyzed fusion cycle preceding muonic molecule formation are discussed. These include muonic atom formation as well as the subsequent elastic, isotopic-exchange, and hyperfine-state quenching collisions of the muonic atoms. Modern methods for atomic capture of the negative muon are reviewed. Elastic and inelastic cross sections obtained in the improved adiabatic representation are given, and rates at liquidhydrogen density are tabulated for easy reference and comparison.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01027941
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  • 6
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    Observing the Growth of Metal–Organic Frameworks by in Situ Liquid Cell Transmission Electron Microscopy (2015)
    American Chemical Society (ACS)
    Details
    Publication Date: 2015-06-09
    Description: Journal of the American Chemical Society DOI: 10.1021/jacs.5b00817
    Print ISSN: 0002-7863
    Electronic ISSN: 1520-5126
    Topics: Chemistry and Pharmacology
    Published by American Chemical Society (ACS)
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  • 7
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    Inference of riverine nitrogen processing from longitudinal and diel variation in dual nitrate isotopes (2012)
    Wiley
    Details
    Publication Date: 2012-02-24
    Description: Longitudinal and diel measurements of dual isotope composition (δ15N and δ18O) in nitrate (NO3-N) were made in the Ichetucknee River, a large (∼8 m3 s−1), entirely spring-fed river in North Florida, to determine whether isotopic variation can deconvolve assimilatory and dissimilatory removal. Comparing nitrate concentrations and isotope composition during the day and night we predicted (1) daytime declines in total fractionation due to low assimilatory fractionation and (2) diurnal variation in dual isotope coupling between 1:1 (assimilation) and 2:1 (denitrification). Five daytime longitudinal transects comprising 10 sampling stations showed consistent NO3-N removal (25–35% of inputs) and modest fractionation (15εtotal between −2 and −6‰, enriching the residual nitrate pool). Lower fractionation (by ∼1‰) during two nighttime transects, suggests higher fractionation due to assimilation than denitrification. Total fractionation was significantly negatively associated with discharge, input [NO3-N], N mass removal, and fractional water loss. Despite well-constrained mass balance estimates that denitrification dominated total N removal, isotope coupling was consistently 1:1, both for longitudinal and diel sampling. Hourly samples on two dates at the downstream location showed significant diel variation in concentration ([NO3-N] amplitude = 60 to 90 μg N L−1) and isotope composition (δ15N amplitude = −0.7‰ to −1.6‰). Total fractionation differed between day and night only on one date but estimated assimilatory fractionation assuming constant denitrification was highly variable and implausibly large (for N, 15ε = −2 to −25‰), suggesting that fractionation and removal due to denitrification is not diurnally constant. Pronounced counterclockwise hysteresis in the relationship between [NO3-N] and δ15N suggests diel variation in N isotope dynamics. Together, low fractionation, isotope versus concentration hysteresis, and consistent 1:1 isotope coupling suggests that denitrification is controlled by NO3− diffusion into the benthic sediments, the length of which is mediated by riverine oxygen dynamics. While using dual isotope behavior to deconvolve removal pathways was not possible, isotope measurements did yield valuable information about riverine N cycling and transformations.
    Print ISSN: 0148-0227
    Topics: Biology , Geosciences
    Published by Wiley on behalf of American Geophysical Union (AGU).
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  • 8
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    An evidence based approach to evaluating flood adaptation effectiveness including climate change considerations for coastal cities: City of Port Phillip, Victoria, Australia (2019)
    Wiley
    Details
    Publication Date: 2019
    Description: Abstract Coastal cities provide a modelling challenge as surface flow is strongly affected by urban drainage networks and there is interaction between coastal and inland flooding. We present a Graphics Processing Unit (GPU)‐based hydrodynamic model coupled to a hydraulic network that integrates adaptation analysis in the context of current and future flooding. The hydrodynamic model is based on a finite volume implementation of the shallow water equations formulated for overland flow. The hydraulic network is based on a pressure relaxation method, and uses a GPU‐based sparse matrix solver for computational speed. The integrated model is used for modelling potential combined coastal and catchment inundation and climate adaptation analysis for the City of Port Phillip, Victoria, Australia. The key outcome from the adaptation study was that resources spent towards adaptation infrastructure should be investigated in the context of sea level rise (SLR) at least for the next 50 years. The adaptation analysis identified “a tipping point” beyond a SLR of around 0.4 m (expected in the next 30 years) where conventional adaptation approaches will fail. This outcome has resulted in the City realising that significant changes in infrastructure for the region will be necessary rather than just incremental adaptation approaches to deal with future flooding. This article is protected by copyright. All rights reserved.
    Electronic ISSN: 1753-318X
    Topics: Architecture, Civil Engineering, Surveying , Geosciences
    Published by Wiley
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  • 9
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    Evidence of biogeomorphic patterning in a low-relief karst landscape (2014)
    Wiley
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    Publication Date: 2014-05-03
    Description: ABSTRACT Patterned landscapes are often evidence of biotic control on geomorphic processes, emerging in response to coupled ecosystem processes acting at different spatial scales. Self-reinforcing processes at local scales expand patches, while self-inhibiting processes, operating at a distance, impose limits to expansion. In Big Cypress National Preserve (BICY) in southwest Florida, isolated forested wetland depressions (cypress domes) appear to be evenly distributed within a mosaic of short-hydroperiod marshes and pine uplands. To test the hypothesis that the apparent patterning is regular, we characterized frequency distributions and spatial patterns of vegetation communities, surface and bedrock elevation, and soil properties (thickness and phosphorus content). Nearest neighbor distances indicate strongly significant wetland spatial overdispersion, and bedrock elevations exhibited periodic spatial autocorrelation; both observations are consistent with regular patterning. Bedrock elevations and soil P were clearly bimodal, suggesting strong positive feedbacks on wetland patch development. Soil-surface elevations exhibited weaker bimodality, indicating smoothing of surface morphology by some combination of sediment transport, mineral reprecipitation, and organic matter production. Significant negative autocorrelation of bedrock elevations at scales similar to wetland spacing suggest the presence of distal negative feedbacks on patch expansion. These findings support the inference of regular patterning, and are consistent with the presence of local positive feedbacks among hydroperiod, vegetation productivity and bedrock dissolution. These processes are ultimately constrained by distal negative feedbacks, potentially induced by landscape scale limitations on the water volume required to enable this biogeomorphic mechanism. This article is protected by copyright. All rights reserved.
    Print ISSN: 0197-9337
    Electronic ISSN: 1096-9837
    Topics: Geography , Geosciences
    Published by Wiley
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  • 10
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    Sands at Gusev Crater, Mars (2014)
    Wiley
    Details
    Publication Date: 2014-03-29
    Description: Processes, environments, and the energy associated with the transport and deposition of sand at Gusev crater are characterized at the microscopic scale through the comparison of statistical moments for particle size and shape distributions. Bivariate and factor analyses define distinct textural groups at 51 sites along the traverse completed by the Spirit rover as it crossed the plains and went into the Columbia Hills. Fine-to-medium sand is ubiquitous in ripples and wind drifts. Most distributions show excess fine material, consistent with a predominance of wind erosion over the last 3.8-billion years. Negative skewness at West Valley is explained by the removal of fine sand during active erosion, or alternatively, by excess accumulation of coarse sand from a local source. The coarse to very coarse sand particles of ripple armors in the basaltic plains have a unique combination of size and shape. Their distribution display significant changes in their statistical moments within the ~400 m that separate the Columbia Memorial Station from Bonneville crater. Results are consistent with aeolian and/or impact deposition, while the elongated and rounded shape of the grains forming the ripples, as well as their direction of origin could point to Ma'adim Vallis as a possible source. For smaller particles on the traverse, our findings confirm that aeolian processes have dominated over impact and other processes to produce sands with the observed size and shape patterns across a spectrum of geologic (e.g., ripples, plains soils) and aerographic settings (e.g., wind shadows).
    Print ISSN: 0148-0227
    Topics: Geosciences , Physics
    Published by Wiley on behalf of American Geophysical Union (AGU).
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