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  • 1
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    A multi‐parameter approach to quantify riverbed clogging and vertical hyporheic connectivity (2023)
    John Wiley & Sons, Ltd. | Chichester, UK
    Details
    Publication Date: 2024-01-26
    Description: 〈title xmlns:mml="http://www.w3.org/1998/Math/MathML"〉Abstract〈/title〉〈p xmlns:mml="http://www.w3.org/1998/Math/MathML" xml:lang="en"〉Riverbed clogging is key to assessing vertical connectivity in the hyporheic zone and is often quantified using single‐parameter or qualitative approaches. However, clogging is driven by multiple, interacting physical and bio‐geochemical parameters, which do not allow for a conclusive assessment of hyporheic connectivity with single‐parameter approaches. In addition, existing qualitative assessments lack transparency and repeatability. This study introduces a Multi‐Parameter Approach to quantify Clogging and vertical hyporheic connectivity (MultiPAC), which builds on standardized measurements of physical (grain size characteristics, porosity, hydraulic conductivity) and bio‐geochemical (interstitial dissolved oxygen) parameters. We apply MultiPAC at three gravel‐bed rivers and show how the set of parameters provides a representative appreciation of physical riverbed clogging, thus quantifying vertical hyporheic connectivity. However, more parameters are required to fully characterize biological clogging. In addition, MultiPAC locates clogged layers in the hyporheic zone through multi‐parameter vertical profiles over the riverbed depth. The discussion outlines the relevance of MultiPAC to guide field surveys.〈/p〉
    Description: https://github.com/Ecohydraulics/kf-converter-w-flopy
    Keywords: ddc:550.724 ; colmation ; dissolved oxygen ; grain size ; hydraulic conductivity ; porosity ; siltation
    Language: English
    Type: doc-type:article
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    CITATION GEO-LEO
  • 2
    Electronic Resource
    Electronic Resource
    Selective sorption uptake kinetics of n-hexane on ZSM 5 - a new method for measuring anisotropic diffusivities (1993)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 97 (1993), S. 13685-13690 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100153a043
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  • 3
    Electronic Resource
    Electronic Resource
    Auger study of grain boundaries in large-grained YBa2Cu3Ox (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 52 (1988), S. 745-747 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A scanning Auger microscopy study has been carried out on fractured surfaces of YBa2Cu3Ox samples prepared by standard sintering procedures from powders. It is concluded that in the large-grained samples examined, a majority of the grain boundaries are sufficiently "open'' that standard metallographic preparation causes them to become contaminated with C. This suggests that an actual loss of contact at the grain boundaries during sample preparation is responsible for the low Jc values observed in bulk-sized large-grained YBa2Cu3Ox.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.99334
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  • 4
    Electronic Resource
    Electronic Resource
    A LEELS and Auger study of the oxidation of liquid and solid tin
    Amsterdam : Elsevier
    Surface Science Letters 134 (1983), S. A424-A425 
    Details
    ISSN: 0167-2584
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0167-2584(83)90731-4
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  • 5
    Electronic Resource
    Electronic Resource
    A LEELS and auger study of the oxidation of liquid and solid tin
    Amsterdam : Elsevier
    Surface Science 134 (1983), S. 499-528 
    Details
    ISSN: 0039-6028
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0039-6028(83)90438-7
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  • 6
    Electronic Resource
    Electronic Resource
    Adsorption of hydrocarbons and water on ZSM 5 and on ZSM 5 converted by dealumination into silicalite (1987)
    Springer
    Journal of inclusion phenomena and macrocyclic chemistry 5 (1987), S. 307-313 
    Details
    ISSN: 1573-1111
    Keywords: Adsorption ; hydrocarbons ; water ; ZSM 5 ; silicalite ; dealumination
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Adsorption measurements of hydrocarbons and water have been performed on ZSM 5 (Si/Al=30) and on two samples prepared from this by dealumination. The properties of the highly dealuminated sample agree essentially with those of silicalite obtained by direct synthesis. The pecularities in the adsorption of benzene at more than one molecule per 1/4 unit cell are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00665363
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  • 7
    Electronic Resource
    Electronic Resource
    Eutectic alloys of thorium-niobium and thorium-titanium (1980)
    Springer
    Journal of materials science 15 (1980), S. 2115-2117 
    Details
    ISSN: 1573-4803
    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/BF00550640
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  • 8
    Electronic Resource
    Electronic Resource
    Neue ternäre Phosphide und Arsenide des Caesiums mit Elementen der 8. Nebengruppe (1992)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 609 (1992), S. 122-126 
    Details
    ISSN: 0044-2313
    Keywords: Ternary intermetallic compounds ; cesium ; crystal structures ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: New Ternary Phosphides and Arsenides of Cesium and Element of the 8th Transition Metal GroupIn the ternary systems Cesium/8th transition metal group/5th main group some new compounds were found and investigated. By single crystal measurements CsRh2P2 was found to crystallize in the space group 14/mmm with the lattice constants a = 390.11 pm and c = 1429.36 pm. The new compounds with the formula CsM2X2 (M = Fe, Co, Ru, Rh, Ir; X = P or As) crystallize in the ThCr2Si2-type structure, compounds of the formula Cs2MX2 (M = Ni, Pd, Pt; X = P or As) can be placed in a line with the K2PdP2-type structure.
    Notes: In Dreistoffsystemen Caesium/Element der 8. Nebengruppe/5. Hauptgruppe konnten weitere ternäre intermetallische Verbindungen dargestellt und untersucht werden. Die neuen Verbindungen der Zusammensetzung CsM2X2 (M = Fe, Co, Ru, Rh, Ir; X = P oder As) kristallisieren wie CsRh2P2 ebenfalls in der ThCr2Si2-Struktur. Die Verbindungen der Zusammensetzung Cs2MX2 (M = Ni, Pd, Pt; X = P oder As) lassen sich dem K2PdP2-Typ zuordnen. Einkristalluntersuchungen an einem Kristall von CsRh2P2 ergeben die Raumgruppe 14/mmm mit den Gitterkonstanten a = 390,11pm, c = 1429,36 pm.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19926090322
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  • 9
    Electronic Resource
    Electronic Resource
    Adsorptionsuntersuchungen an Organokieselsäurepolymeren (1992)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 612 (1992), S. 137-142 
    Details
    ISSN: 0044-2313
    Keywords: Adsorption and swelling ; isothermes ; specific surfaces ; organosilicic acid ; double four-ring silicate units ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Adsorption Studies on Organosilic Acid PolymersWe present four organosilic acid polymers containing double-4-ring silicate units cross-linked at different degree by different organosilicon bridges. BET surfaces were determined and adsorption isotherms of n-hexane, benzene, nitrogen and water were measured. All polymers are hydrophobic, one of them behaves microporously, the other are unporous. With organic adsorptives, swelling and adsorption occur simultaneously. Possible relations of microporosity and structure are discussed.
    Notes: BET-Oberflächen und Isothermen von n-Hexan, Benzen, Wasser und Stickstoff wurden an vier Organokieselsäurepolymeren vermessen, die sich im Vernetzungsgrad der Doppelvierring-Kieselsäureeinheiten Si8O20 und in der Struktur der Brücken unterscheiden. Ein Polymere ist mikroporös, die anderen sind unporös. Alle Polymere verhalten sich hydrophob. Neben der Adsorption tritt Quellung bei der Einwirkung organischer Adsorptive auf. Die Zusammenhänge zwischen der Länge der Brücken und der Porosität werden diskutiert.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19926120123
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  • 10
    Electronic Resource
    Electronic Resource
    Zur alkalischen Umesterung von Vinylacetat-Acrylsäure-Copolymeren (1988)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 39 (1988), S. 320-323 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: The alkaline transesterification of vinyl acetate-acrylic acid copolymers has been investigated in dependence of the copolymer composition, the concentration of copolymer, the concentration of NaOH, and the influence of unpolar solvents added. The influence of the reaction conditions on the rate of transesterification is discussed on the base of the rest acetate content in comparison with the transesterification mechanism of PVAC.
    Notes: Die alkalische Umesterung von Vinylacetat-Acrylsäure-Copolymeren wurde in Abhängigkeit von der Copolymerzusammensetzung, der Konzentration und dem Einfluß unpolarer Lösungsmittelzusätze untersucht. Der Einfluß der Reaktionsbedingungen auf die Umesterungsgeschwindigkeit wird über den Restacetatgehalt im Vergleich zum Umesterungsmechanismus von PVAC diskutiert.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1988.010390612
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