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  • Polymer and Materials Science  (2)
  • 550 - Earth sciences  (1)
  • calculation
  • Equisetum
  • pollen analytical standard techniques
  • R/V Vereshchagin
  • 2005-2009  (1)
  • 1970-1974  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 25 (1974), S. 906-909 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Mechanism of the electropolishing of molybdenum in nonaqueous electrolytesMeasurements carried out on molybdenum electrodes in solutions of magnesium per-chlorate and lithium chloride in ethanol dimethylsulphoxide and dimethyl form-amide have shown that the metal can be electropolished in solutions containing perchlorate. The formal valency (nformal) of the molybdenum dissolution in the electropolishing region, as determined from the weight loss of the electrode and the charge transferred is 3≤n formal≤ 2,75.
    Notes: Es wurden Messungen an Molybdänelektroden in Lösungen von Magnesiumperchlorat und Lithiumchlorid in Äthanol, Dimethylsulfoxid und Dimethylformamid durchgeführt.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 22 (1971), S. 115-120 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Electrochemical studies on molybdenumThe authors show, that the power law found during earlier measurements is valid for at least five decimal powers of the time. The correlation derived from potentiostatic switch-in measurements has been confirmed by galvanostatic tests. The results give rise to the assumption that the kinetic law has its origin in the rates of the reactions resulting in metal dissolution. In order to elucidate these reactions a triangle potential method has been used. The findings enable a first suggestion to be made as to the reaction sequence.
    Notes: Es wird gezeigt, daß das aus früheren Messungen gefundene Potenzgesetz wenigstens über fünf Zehnerpotenzen der Zeit gültig ist. Der aus potentionstatischen Einschaltmessungen hergeleitete Zusammenhang wurde durch galvanostatische Versuche bestätigt. Die Ergebnisse deuten darauf hin, daß das Zeitgesetz seinen Ursprung im Ablauf der zur Metallauflösung führenden Reaktionen hat. Zur Klärung dieser Reaktionen wurde die Dreiecksspannungsmethode angewendet. Der Meßbefund erlaubt es, einen ersten Vorschlag über die Reaktionsfolge zu machen.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Publication Date: 2020-02-12
    Description: High-resolution pollen records from Lake Baikal revealed considerable regional differences in the vegetation development and pronounced climate variability during the last glacial–interglacial transition and Holocene. Correlation between cores was successfully based on a chronology constructed from AMS 14C dating of pollen concentrates. Comparison to other radiocarbon-dated pollen sequences from the Baikal region suggests that the chronology presented is very reliable, and thus correlation to other dated events can easily be performed. Pollen indices, which reflect relative changes in major vegetation types and limitations of growing conditions by moisture availability and temperature, demonstrate near-synchronous vegetation changes, which suggest synchronous large-scale climate variation across the Baikal region. Due to the limited influence of human impact in the Lake Baikal region, the pollen data illustrate that, in the continental interior of NE Eurasia Holocene, climate variability was very pronounced. After initial warming and a strong increase in relative moisture (ca. 16 cal ka BP), the Bølling–Allerød-like event was punctuated by three cool and dry events. These events, dated between ca. 15 and 13 cal ka BP, can be compared to coolings as recorded in GISP 2 oxygen isotope records from Greenland ice cores. An expansion of Betula sect. Nanae/Fruticosae, Artemisia and Chenopodiaceae marks the Younger-Dryas (YD)-like cooling event (ca. 12.5–12 cal ka BP). High temperatures and favourable moisture conditions during the first part of Holocene favoured the optimum development of dark coniferous taiga between 11–7.5 cal ka BP in the south and 10–8 cal ka BP in the northeast. A fir and spruce decline in the southern mountains (ca. 9.5–8.5 cal ka BP) can be related to the 8.2 cal ka BP cooling event. The pronounced mid-Holocene cooling event and a transition towards dry conditions (ca. 8–7 cal ka BP) preceded the nearly synchronous regional expansion of pine taiga. Maximum distribution of Scots pine forests marks the Holocene thermal optimum (ca. 6.5–5.7 cal ka BP), which was followed by two subsequent cooling events (ca. 5.5–4.5 cal ka BP) at the Atlantic–Subboreal transition. A subsequent temperature optimum in the southeastern Baikal region ended with pronounced cooling during the Subboreal–Subatlantic transition (ca. 3–2.5 cal ka BP). A late spread of shrub alders may evidence the beginning of the Little Ice Age.
    Keywords: 550 - Earth sciences
    Type: info:eu-repo/semantics/article
    Format: application/pdf
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