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  • Chemistry  (3)
  • 202-1240; 202-1242; CD38-17P; Center for Marine Environmental Sciences; Cocos Ridge; Comment; COMPCORE; Composite Core; Difference; Equatorial East Pacific; Event label; GC; Giant piston corer; GPC; Gravity corer; IMAGES VIII - MONA; Joides Resolution; KNR195-5-CDH26; Leg202; Marion Dufresne (1995); MARUM; MD022529; MD02-2529; MD126; ME0005A; ME0005A-27JC; ME0005A-43JC; Melville; NEMO; North Pacific Ocean; PC; Piston corer; Reference/source; Sample code/label; Sea surface temperature; South Pacific Ocean; Species; TR163-19; TR163-22; V19; V19-27; V19-28; V19-30; V21; V21-30; Vema  (1)
  • 361-U1476A; 361-U1476C; 361-U1476D; 361-U1476E; AGE; Calculated; Date/Time of event; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Event label; Exp361; Globigerinoides ruber, δ18O; Globigerinoides ruber, δ18O, standard deviation; Ice volume corrected; Identification; Indian Ocean; IODP Depth Scale Terminology; Joides Resolution; Latitude of event; Longitude of event; Magnesium/Calcium ratio; oxygen isotope ratios; oxygen isotopes; planktic foraminifera; Salinity; Temperature; Sample code/label; Sea surface salinity; Sea surface temperature; Sea surface temperature, standard deviation; South African Climates (Agulhas LGM Density Profile); SST from Mg/Ca ratios; δ18O, seawater, reconstructed; δ18O, seawater, reconstructed, standard deviation  (1)
  • AGE; ANT-VIII/3; AWI_Paleo; DEPTH, sediment/rock; Gravity corer (Kiel type); Paleoenvironmental Reconstructions from Marine Sediments @ AWI; Polarstern; PS16; PS16/311; PS1768-8; Radiolarians, δ18O; Shona Ridge; SL  (1)
  • AGE; ANT-VIII/3; AWI_Paleo; DEPTH, sediment/rock; Gravity corer (Kiel type); Paleoenvironmental Reconstructions from Marine Sediments @ AWI; Polarstern; PS16; PS16/311; PS1768-8; Radiolarians, δ30Si; Shona Ridge; SL  (1)
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Keywords
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  • 1
    Electronic Resource
    Electronic Resource
    Photopolymerization of N-substituted phenyl maleimide initiated with N,N-dimethyl-4-toluidine (1997)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 35 (1997), S. 643-650 
    Details
    ISSN: 0887-624X
    Keywords: photopolymerization of N-substituted phenyl maleimides ; N,N-dimethyl-4-Toluidine ; exciplex ; radical intermediate ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Several N-phenyl maleimides with different p-substituents have been synthesized from the maleic anhydride and relevant aromatic amine. In the presence of N,N-dimethyl-4-toluidine (DMT), the N-substituted phenyl maleimide (4-XPhMIs) could be polymerized under UV irradiation. It was observed that a new absorption appeared on the UV-Vis spectrum of the mixture solution of 4-XPhMI and DMT, which reveals the formation of charge-transfer complex in the ground state. It was found that the fluorescence of DMT was quenched by 4-XPhMI and the quenching constant of 4-XPhMI, obtained from the Stern-Volmer plot, increases with the electron-deficiency of ethylene double bond of 4-XPhMI. The dynamic quenching of the fluorescence of DMT by 4-XPhMI suggests the formation of exciplex in excited state between DMT and 4-XPhMI. The radicals formed in the systems have been detected by spin-trapping techniques and electron paramagnetic resonance (EPR) spectrometer. Based on all of these results, it has been proposed that the initiation process of the polymerization involves the formation of exciplex and the initial radicals were produced by proton-transfer in the exciplex from DMT to 4-XPhMI. © 1997 John Wiley & Sons, Inc.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
  • 2
    Electronic Resource
    Electronic Resource
    The electropolymerization of poly(styrene-co-4-carboxyphenyl maleimide) coatings onto steel (1996)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 62 (1996), S. 1303-1312 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Electropolymerization can be used to produce uniform and pin-hole free coatings on surfaces of complex shapes, due to the intrinsic characteristic of the process. In this article, the electrocopolymerization behavior of 4-carboxyphenyl maleimide (4CPMI) with styrene onto a steel surface is reported. The polymerization mechanism is by free radical, as might be expected for an aqueous reaction environment. Experimental results suggest that initially a charge transfer complex forms between styrene and 4CPMI, which is much more reactive than either of the two monomers. Alternating copolymers are always obtained at low conversion, even with significant changes in the monomer feed compositions. Because of the incorporation of rigid imide rings into the copolymer backbone, the coating formed has very good thermal properties and is thus a potential candidate for high-temperature applications. Furthermore, the copolymer dielectric constant is comparable to that of commercial polyimides, making it attractive for use in electrical and electronic insulation applications. © 1996 John Wiley & Sons, Inc.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
  • 3
    Electronic Resource
    Electronic Resource
    Some Synthetic Studies Related to Perylenequinones (1993)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1993 (1993), S. 35-41 
    Details
    ISSN: 0170-2041
    Keywords: Fungus pigments ; Perylenequinones, synthesis of ; Selenium dioxide oxidation ; Ullmann coupling ; Double coupling of 1,2-naphthalenediols ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Two closely related routes to dimethyl 3,10-dihydro-2,11-dihydroxy-4,6,7,9-tetramethoxy-3,10-dioxo-1,12-perylenediacetate (10), one involving Ullmann phenol coupling and the other by double oxidative coupling are described. Regioselective demethylation of 10 followed by methylation or vice versa yields dimethyl 3,10-dihydro-4,9-dihydroxy-2,6,7,11-tetramethoxy-3,10-dioxo-1,12-perylenediacetate (22) which, except for its side chains, structurally resembles some of the natural perylenequinones.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.199319930107
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  • 4
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    Planktic Foraminifera SST and ice volume corrected oxygen isotopes from IODP Site 361-U1476 Mozambique Channel Indian Ocean for the past 1.2Ma (2023)
    PANGAEA
    Details
    Publication Date: 2023-12-13
    Description: Indian Ocean surface circulation is an important part of the global ocean conveyor belt, and is connected via two important gateways including the Indonesian Throughflow, and the Agulha Leakage. Changes in the surface hydrography of the Indian Ocean may therefore impact on the global overturning circulation. Here we present oxygen-isotopes and magnesium/calcium ratios from planktic foraminifer Globigernoides ruber from core site U1476 to reconstruct sea surface salinity and sea surface temperature in the Mozambique Channel, Indian Ocean for the past 1.2Ma. We investigated the changes in the surface hydrography of the Mid-to-Late Pleistocene and find an early salinification and warming during glacial cycles.
    Keywords: 361-U1476A; 361-U1476C; 361-U1476D; 361-U1476E; AGE; Calculated; Date/Time of event; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Event label; Exp361; Globigerinoides ruber, δ18O; Globigerinoides ruber, δ18O, standard deviation; Ice volume corrected; Identification; Indian Ocean; IODP Depth Scale Terminology; Joides Resolution; Latitude of event; Longitude of event; Magnesium/Calcium ratio; oxygen isotope ratios; oxygen isotopes; planktic foraminifera; Salinity; Temperature; Sample code/label; Sea surface salinity; Sea surface temperature; Sea surface temperature, standard deviation; South African Climates (Agulhas LGM Density Profile); SST from Mg/Ca ratios; δ18O, seawater, reconstructed; δ18O, seawater, reconstructed, standard deviation
    Type: Dataset
    Format: text/tab-separated-values, 4159 data points
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    DATA PANGAEA
  • 5
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    (Table S2) The reconstructed sea surface temperature (SST) over the eastern equatorial Pacific (2016)
    PANGAEA
    In:  Supplement to: Zhang, Yancheng; Zhang, Xu; Chiessi, Cristiano Mazur; Mulitza, Stefan; Zhang, Xiao; Lohmann, Gerrit; Prange, Matthias; Behling, Hermann; Zabel, Matthias; Govin, Aline; Sawakuchi, André Oliveira; da Cruz Junior, Francisco William; Wefer, Gerold (2016): Equatorial Pacific forcing of western Amazonian precipitation during Heinrich Stadial 1. Scientific Reports, 6, 35866, https://doi.org/10.1038/srep35866
    Details
    Publication Date: 2023-11-25
    Description: Abundant hydroclimatic evidence from western Amazonia and the adjacent Andes documents wet conditions during Heinrich Stadial 1 (HS1, 18-15 ka), a cold period in the high latitudes of the North Atlantic. This precipitation anomaly was attributed to a strengthening of the South American summer monsoon due to a change in the Atlantic interhemispheric sea surface temperature (SST) gradient. However, the physical viability of this mechanism has never been rigorously tested. We address this issue by combining a thorough compilation of tropical South American paleorecords and a set of atmosphere model sensitivity experiments. Our results show that the Atlantic SST variations alone, although leading to dry conditions in northern South America and wet conditions in northeastern Brazil, cannot produce increased precipitation over western Amazonia and the adjacent Andes during HS1. Instead, an eastern equatorial Pacific SST increase (i.e., 0.5-1.5 °C), in response to the slowdown of the Atlantic Meridional Overturning Circulation during HS1, is crucial to generate the wet conditions in these regions. The mechanism works via anomalous low sea level pressure over the eastern equatorial Pacific, which promotes a regional easterly low-level wind anomaly and moisture recycling from central Amazonia towards the Andes.
    Keywords: 202-1240; 202-1242; CD38-17P; Center for Marine Environmental Sciences; Cocos Ridge; Comment; COMPCORE; Composite Core; Difference; Equatorial East Pacific; Event label; GC; Giant piston corer; GPC; Gravity corer; IMAGES VIII - MONA; Joides Resolution; KNR195-5-CDH26; Leg202; Marion Dufresne (1995); MARUM; MD022529; MD02-2529; MD126; ME0005A; ME0005A-27JC; ME0005A-43JC; Melville; NEMO; North Pacific Ocean; PC; Piston corer; Reference/source; Sample code/label; Sea surface temperature; South Pacific Ocean; Species; TR163-19; TR163-22; V19; V19-27; V19-28; V19-30; V21; V21-30; Vema
    Type: Dataset
    Format: text/tab-separated-values, 88 data points
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    DATA PANGAEA
  • 6
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    (Supplementary Table 10) Silicon isotope data from radiolarian opal of the 〉250 µm and 125-250μm fractions from core PS1768-8 (2015)
    PANGAEA
    Details
    Publication Date: 2024-06-25
    Keywords: AGE; ANT-VIII/3; AWI_Paleo; DEPTH, sediment/rock; Gravity corer (Kiel type); Paleoenvironmental Reconstructions from Marine Sediments @ AWI; Polarstern; PS16; PS16/311; PS1768-8; Radiolarians, δ30Si; Shona Ridge; SL
    Type: Dataset
    Format: text/tab-separated-values, 109 data points
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    DATA PANGAEA
  • 7
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    (Supplementary Table 9) Oxygen isotope data from radiolarian opal of the 〉250 µm fraction from core PS1768-8 (2015)
    PANGAEA
    Details
    Publication Date: 2024-06-25
    Keywords: AGE; ANT-VIII/3; AWI_Paleo; DEPTH, sediment/rock; Gravity corer (Kiel type); Paleoenvironmental Reconstructions from Marine Sediments @ AWI; Polarstern; PS16; PS16/311; PS1768-8; Radiolarians, δ18O; Shona Ridge; SL
    Type: Dataset
    Format: text/tab-separated-values, 72 data points
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    DATA PANGAEA
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