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  • differential scanning calorimetry  (3)
  • Quantum optics, physics of lasers, nonlinear optics, classical optics  (2)
  • Permafrost  (1)
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  • 1
    Digitale Medien
    Digitale Medien
    Environmental effects on CO2 efflux from riparian tundra in the northern foothills of the Brooks Range, Alaska, USA (1992)
    Springer
    Oecologia 92 (1992), S. 568-577 
    Details
    ISSN: 1432-1939
    Schlagwort(e): Arctic tundra ; Depth of thaw ; Ecosystem carbon exchange ; Permafrost ; Soil respiration
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary Carbon dioxide efflux and soil microenvironmental factors were measured diurnally in Carex aquatilus-and Eriophorum angustifolium-dominated riparian tundra communities to determine the relative importance of soil environmental factors controlling ecosystem carbon dioxide exchange with the atmosphere. Measurements were made weekly between 18 June and 24 July 1990. Diurnal patterns in carbon dioxide efflux were best explained by changes in soil temperature, while seasonal changes in efflux were correlated with changes in depth to water table, depth to frozen soil and soil moisture. Carbon dioxide efflux rates were lowest early in the growing season when high water tables and low soil temperatures limited microbial and root activity. Individual rainfall events that raised the water table were found to strongly reduce carbon dioxide efflux. As the growing season progressed, rainfall was low and depth to water table and soil temperatures increased. In response, carbon dioxide efflux increased strongly, attaining rates late in the season of approximately 10 g CO2 m−2 day−1. These rates are as high as maxima recorded for other arctic sites. A mathematical model is developed which demonstrates that soil temperature and depth to water table may be used as efficient predictors of ecosystem CO2 efflux in this habitat. In parallel with the field measurements of CO2 efflux, microbial respiration was studied in the laboratory as a function of temperature and water content. Estimates of microbial respiration per square meter under field conditions were made by adjusting for potential respiring soil volume as water table changed and using measured soil temperatures. The results indicate that the effect of these factors on microbial respiration may explain a large part of the diurnal and seasonal variation observed in CO2 efflux. As in coastal tundra sites, environmental changes that alter water table depth in riparian tundra communities will have large effects on ecosystem CO2 efflux and carbon balance.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00317851
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Synthesis and crosslinking of polyethers with nadimide derivative pendant groups (1992)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 30 (1992), S. 2379-2387 
    Details
    ISSN: 0887-624X
    Schlagwort(e): nadimide ; crosslinking kinetics ; polyethers ; differential scanning calorimetry ; thermogravimetric analyses ; Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Polyethers with nadimide derivatives pendent groups have been prepared by ring-opening polymerization of nadimide glycidyl derivatives. The structure of the linear polymers has been confirmed by spectroscopic methods. Properties such glass transition temperatures and thermal resistance have been measured and related to their chemical structure. Crosslinking studies have been carried out by DSC and TGA. Kinetic parameters could be obtained by dynamic method. The crosslinking causes an increase in Tg of the system and it has been possible to relate this increase to the chemical structure of the network. © 1992 John Wiley & Sons, Inc.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pola.1992.080301112
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Thermosets obtained by chemical modification of epichlorohydrin-ethylene oxide copolymer and their crosslinking through double bonds (1995)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 33 (1995), S. 941-948 
    Details
    ISSN: 0887-624X
    Schlagwort(e): polyethers ; differential scanning calorimetry ; crosslinking kinetics ; PECH-PEO ; thermosets ; Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The epichlorohydrin-ethyleneoxide copolymer is modified with 10-undecenoate and 4-pentenoate moieties in order to obtain thermosets by cross-linking through their double bonds. These polymers are then characterized using NMR, IR, chlorine elemental analyses, X-ray powder diffraction, DSC, TGA, and viscosimetric measurements. Because the thermal crosslinking reaction overlaps in all cases with degradation processes, a free radical source (dicumyl peroxide) is necessary. The Arrhenius kinetic parameters are determined by DSC, using Ozawa and Kissinger expressions. Finally, the quality of cured materials is tested by TGA. © 1995 John Wiley & Sons, Inc.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pola.1995.080330607
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    Crosslinking study of polyethers containing pendent double bonds (1995)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 33 (1995), S. 1565-1571 
    Details
    ISSN: 0887-624X
    Schlagwort(e): olephins ; crosslinking kinetics ; polyethers ; differential scanning calorimetry ; thermogravimetric analyses ; Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: This article studies the crosslinking reactions of some polyethers containing double bonds on the side chains. Thermal crosslinking takes place in all cases, but is overlapped by the degradation process. So, a catalyst has to be used to obtain the cured material and avoid degradation. The best initiator appears to be dicumyl peroxide and the maximum cross-linking degree is achieved only with 5% (w/w). Thermogravimetric analyses are used to test the quality of the cured materials. IR spectroscopy shows that crosslinking actually takes place by polymerizing pendent double bonds. Furthermore, activation energies for thermal and radical initiated crosslinking are determined by means of dynamic DSC studies. © 1995 John Wiley & Sons, Inc.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pola.1995.080331002
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  • 5
    facet.materialart.
    Unbekannt
    Ultralow-dissipation micro-oscillator for quantum optomechanics (2012)
    American Physical Society (APS)
    Details
    Publikationsdatum: 2012-11-27
    Beschreibung: Author(s): E. Serra, A. Borrielli, F. S. Cataliotti, F. Marin, F. Marino, A. Pontin, G. A. Prodi, and M. Bonaldi Generating nonclassical states of light by optomechanical coupling depends critically on the mechanical and optical properties of micro-oscillators and on the minimization of thermal noise. We present an oscillating micromirror with a mechanical quality factor Q =2.6×10 6 at cryogenic temperature and ... [Phys. Rev. A 86, 051801] Published Mon Nov 26, 2012
    Schlagwort(e): Quantum optics, physics of lasers, nonlinear optics, classical optics
    Print ISSN: 1050-2947
    Digitale ISSN: 1094-1622
    Thema: Physik
    Publiziert von American Physical Society (APS)
    Standort Signatur Erwartet Verfügbarkeit
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  • 6
    facet.materialart.
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    Frequency-noise cancellation in optomechanical systems for ponderomotive squeezing (2014)
    American Physical Society (APS)
    Details
    Publikationsdatum: 2014-03-08
    Beschreibung: Author(s): A. Pontin, C. Biancofiore, E. Serra, A. Borrielli, F. S. Cataliotti, F. Marino, G. A. Prodi, M. Bonaldi, F. Marin, and D. Vitali Ponderomotive squeezing of the output light of an optical cavity has been recently observed in the megahertz range in two different cavity optomechanical devices. Quadrature squeezing becomes particularly useful at lower spectral frequencies, for example, in gravitational wave interferometers, despi... [Phys. Rev. A 89, 033810] Published Fri Mar 07, 2014
    Schlagwort(e): Quantum optics, physics of lasers, nonlinear optics, classical optics
    Print ISSN: 1050-2947
    Digitale ISSN: 1094-1622
    Thema: Physik
    Publiziert von American Physical Society (APS)
    Standort Signatur Erwartet Verfügbarkeit
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