ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    facet.materialart.
    Unknown
    Oxygen isotope composition of diatoms from sediments of Lake Kotokel (Buryatia). (2016)
    ELSEVIER SCIENCE BV
    In:  EPIC3Russian Geology and Geophysics, ELSEVIER SCIENCE BV, 57, pp. 1213-1221, ISSN: 1068-7971
    Details
    Publication Date: 2016-08-14
    Description: This is a summary of new oxygen isotope data for diatoms from Lake Kotokel sediments, with implications for responses of the lake system and its environment to global change over the past 46 kyr. Fossil diatoms in all samples are free from visible contamination signatures and contain no more than 2.5% Al2O3, which ensures reliable reconstructions. The δ18O values in diatoms vary between +23.7 and +31.2‰ over the record. The results mainly represent diatom assemblages of summer blooming periods, except for the time span between 36 and 32 kyr, when the isotopic signal rather records a shift from summer to spring blooming conditions. Possible water temperature changes only partly explain the changes in the isotopic record. The observed isotopic patterns are produced mainly by isotope changes in lake water in response to variations in air temperature, hydrology, and atmospheric circulation in the region. During Marine Isotope Stage (MIS) 2 (Last Glacial maximum), high δ18Odiatom resulted from rapid evaporation and low fluvial inputs. The high δ18O values of about +29 to +30‰ during the first half of MIS 1 (Holocene interglacial) suggest an increased share of summer rainfalls associated with southern/southeastern air transport. The δ18O decrease to +24‰ during the second half of MIS 1 is due to the overall hemispheric cooling and increased moisture supply to the area by the Atlantic transport. The record of Lake Kotokel sediments provides an example of complex interplay among several climatic controls of δ18Odiatom in the Late Pleistocene and the Holocene.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , peerRev
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER (OA)
  • 2
    facet.materialart.
    Unknown
    Reconstruction of the Holocene Climate of Transbaikalia: Evidence from the Oxygen Isotope Analysis of Fossil Diatoms from Kotokel Lake (2013)
    Pleiades Publishing
    In:  EPIC3Doklady Earth Sciences, Pleiades Publishing, 451(1), pp. 732-736, ISSN: 1028-334X,
    Details
    Publication Date: 2019-07-17
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER (OA)
  • 3
    Electronic Resource
    Electronic Resource
    Set of luminescence pressure sensors for aerospace research
    Amsterdam : Elsevier
    Sensors and Actuators B: Chemical 11 (1993), S. 201-206 
    Details
    ISSN: 0925-4005
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0925-4005(93)85255-9
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Protolytic photodissociation of hydroxyaromatic compounds in micelles and lipid bilayer membranes of vesicles (1991)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 95 (1991), S. 3438-3444 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100161a088
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Fluorescence of pyrene intramolecular excimers in Langmuir-Blodgett films
    Amsterdam : Elsevier
    Thin Solid Films 204 (1991), S. 441-449 
    Details
    ISSN: 0040-6090
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0040-6090(91)90082-9
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Sedimentation processes and new age constraints on rifting stages in Lake Baikal: results of deep-water drilling (2000)
    Springer
    International journal of earth sciences 89 (2000), S. 183-192 
    Details
    ISSN: 1437-3262
    Keywords: Key words Rifting stages ; Lake Baikal ; Sedimentary environments ; Lithology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract  With this paper we present a first attempt to combine the direct results on lithology, composition and age dating in the boreholes BDP-93, BDP-96 and BDP-97 with geological and seismic data from the areas where those sections were drilled. The sedimentary environments represented by the BDP boreholes are markedly different and possess characteristic lithological features. The results of the deep drilling provide the essential means for testing numerous age models used in geological reconstructions of the Lake Baikal rifting dynamics. Neither the basin-wide unconformity interpreted from seismic data, nor the interpreted change from shallow-water to deep-water facies at the boundary of the seismic stratigraphic complexes were found in the BDP-96 boreholes on Academician Ridge. Also, lithology does not support the proposed reconstructions of intense lake level fluctuations and transgressions during the Pliocene at Academician Ridge. The continuous deep-water hemipelagic sedimentation at Academician Ridge has existed for the past 5 Ma. The beginning of an intense rifting phase of the Neobaikalian sub-stage and related drastic changes in sedimentation processes were interpreted on seismic sections as the basin-wide unconformity B10. Different age estimates for this boundary ranged from Late Pliocene (3.5 Ma) to Plio-Pleistocene boundary. As shown by BDP-96 borehole, B10 is associated with a lithological change from diatomaceous ooze to dense silty clay and not with an erosional contact. The new age for this boundary in BDP-96 is approximately 2.5 Ma. This new age constraint suggests that the upper sedimentary strata of Northern Baikal (1.5–1.7 km thick) have formed during the past 2.5 Ma with average sedimentation rates of 60–70 cm/ka. The BDP-93 boreholes at Buguldeika suggest that uplift in Primorsky Range took place prior to 1.07–1.31 Ma, a date which exceeds the age of previous geological models.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s005310000090
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    The Khan-Taishir ophiolitic complex of Western Mongolia, its petrology, origin and comparison with other ophiolitic complexes (1978)
    Springer
    Contributions to mineralogy and petrology 67 (1978), S. 95-109 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract The Khan-Taishir ophiolitic complex is situated within Early Caledonian structures of Western Mongolia. It consists (from below upward) of strongly differentiated ultramafics (dunites and harzburgites), pyroxenites and gabbro, sheeted dikes, pillow lavas and sediments, including in their uppermost part archaeocyatic limestones of Lower Cambrian age. Geological, petrochemical and geochemical data indicate that the ultramafics are turn off from the overlying ophiolitic sequence. Igneous rocks of the ophiolitic complex, except the ultramafics, were formed by two-stage differentiation of mantle magma of quartz-tholeiitic composition exhausted in potassium and titanium. Pyroxenites and gabbro with an anorthositic trend of differentiation were generated during the first stage, and sheeted dikes and pillow lavas with a quartz trend of differentiation were formed during the second one. Ophiolites of the Khan-Taishir complex petrochemically and geochemically differ strongly from mafic and ultramafic rocks of midoceanic ridges. Together with ophiolites of the Troodos complex (Cyprus) and Macquarie Island (eastern Indian Ocean) they constitute the special type of ophiolite peculiar rather to slip boundaries of lithosphere plates. The other type of ophiolite, including complexes like the Dzolen complex of south Mongolia, contains poorly differentiated ultramafics and does not contain sheeted dikes; while the igneous rocks are very similar to mafic and ultramafic rocks dredged from midoceanic and formed probably in midoceanic ridge environments as well.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00371637
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Elektronen-Donator-Akzeptor-Komplexe von Aryldiazoniumsalzen und ihre Photolyse (1975)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 317 (1975), S. 229-240 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Aryldiazonium-tetrafluoroborate bilden mit stärker basischen aromatischen Kohlenwasserstoffen schwache Charge-Transfer-Komplexe, deren Komplexbildungskonstanten bestimmt wurden.Die Logarithmen der Bildungskonstanten steigen linear mit den Halbstufen-Oxydationspotentialen der Aromaten bzw. den Halbstufen-Reduktionspotentialen oder σ-Konstanten der Diazoniumsalze an. Die Photolyse der Komplexe, wei besonders am System p-Chlorbenzoldiazoniumtetrafluoroborat/Pyren untersucht wurde, führt bei Einstrahlung in die CT-Bande zur Spaltung des Diazoniumsalzes in Stickstoff und ein Arylradikal, das durch H-Abstraktion in den betreffenden Aromaten übergeht bzw. durch Radikalfänger abgefangen werden konnte.p-Chlorbenzoldiazonium-tetrafluoroborat löscht die Fluoreszenz von Anthracen, Phenanthren oder Pyren dynamisch mit Geschwindigkeitskonstanten von kq ≈ 1010 l/mol·s (diffusionskontrolliert), wodurch nachgewiesen wird, daß der erste Schritt der Photolyse eine Elektronenübertragung vom Aromaten auf das Diazoniumsalz ist. Der weitere Verlauf als Radikalkettenreaktion wird durch kinetische Befunde erhärtet.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19753170206
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Untersuchungen zu den Sondeneigenschaften von 7-Hydroxy-cumarinen in micellarer Cetyl-triethyl-ammoniumbromid-Lösung - Hilfsmittel zur Beschreibung von micellaren Systemen (1986)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 328 (1986), S. 558-566 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Investigation on Probe Properties of 7-Hydroxy-coumarines in Micellar Cetyl-triethyl-ammoniumbromide Solution - Means for Characterization of Micellar SystemsAnions of 3-substituted 7-hydroxy-coumarines (1a-c) as fluorescence probes have been studied in this work. Acid-base equilibria in water and micellar solution of cetyl-triethylammoniumbromide (cmc = 0,72 mmol l-1), fluorescence properties and fluorescence quenching by octacyano-molybdate-IV have been investigated. It has been confirmed that probe and quencher are completely micellized. Fluorescence life times and quenching constants per one quencher molecule in the micell of about 108 s-1 have been determined. The kinetics of saponification of the probe 3-acetyl-7-hydroxy-coumarine at pH = 12 in micellar solution has been followed by probe fluorescence.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19863280415
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Deactivation behaviour of Photoexcited Aryltropylium Ions. IV. Influence of Ion Pair Formation (1987)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 329 (1987), S. 569-578 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Aryltropylium salts exhibit an unusually effective self quenching of fluorescence in dependence on their concentration in dichlòromethane. The quenching process is investigated by static and time resolved fluorescence measurements. The observed biexponential fluorescence decay is interpreted by the emissions of ion pairs and free cations. The rate constant of fluorescence quenching by formation ion pair is two orders of magnitude greater than the diffusion constant.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19873290406
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...