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
Filter
  • 04. Solid Earth::04.08. Volcanology::04.08.05. Volcanic rocks  (1)
  • 35.00  (1)
  • Best von Kryptanden, Kryptaten  (1)
  • Best. von Lanthan, Cer, Neodym in Anorg. Material, Glas, Praseodymoxid, Aluminium  (1)
  • Analytical Chemistry and Spectroscopy
  • Polymer and Materials Science
  • Springer  (4)
Collection
Keywords
Publisher
Years
  • 1
    facet.materialart.
    Unknown
    Isotopic evidence for open system processes within the Campanian Ignimbrite (Campi Flegrei–Italy) magma chamber (2009)
    Springer
    Details
    Publication Date: 2017-04-04
    Description: New Sr and Nd isotope data for whole rocks, glasses and minerals are combined to reconstruct the nature and origin of mixing end-members of the 200 km3 trachytic to phonolitic Campanian Ignimbrite (Campi Flegrei, Italy) magmatic system. The least-evolved magmatic end-member shows equilibrium between host glass and the majority of the phenocrysts and is less radiogenic in Sr and Nd than the most-evolved magma. On the contrary, only the Fe-rich pyroxene from the most-evolved erupted magma is in equilibrium with the matrix glass, while all other minerals are in isotopic disequilibrium. These magmas mixed prior to and during the Campanian Ignimbrite eruption and minerals were freely exchanged between the magma batches. Combining the results of the geochemical investigations on magma end-members with geophysical and geological data, we develop the following scenario. In stage 1, a parental, less differentiated magma rose into the middle crust, and evolved through combined crustal assimilation and crystal fractionation. In stage 2, the differentiated magma rose to shallower depth, fed the pre-Campanian Ignimbrite activity and evolved by further open-system processes into the most-evolved and most-radiogenic Campanian Ignimbrite end-member magma. In stage 3, new trachytic magma, isotopically distinct from the pre-Campanian Ignimbrite magmas, rose from ca. 6 km to shallower depth, recharged the most-evolved pre-Campanian Ignimbrite magma chamber, and formed the large and stratified Campanian Ignimbrite magmatic system. During the course of the Campanian Ignimbrite eruption, the two layers were tapped separately and/or simultaneously, and gave rise to the range of chemical and isotopic values displayed by the Campanian Ignimbrite pumices, glasses and minerals.
    Description: Published
    Description: 285-300
    Description: 2.3. TTC - Laboratori di chimica e fisica delle rocce
    Description: 3.5. Geologia e storia dei vulcani ed evoluzione dei magmi
    Description: JCR Journal
    Description: reserved
    Keywords: Campanian Ignimbrite ; Radiogenic isotopes ; Mixing process ; 04. Solid Earth::04.08. Volcanology::04.08.03. Magmas ; 04. Solid Earth::04.08. Volcanology::04.08.05. Volcanic rocks
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER (OA)
  • 2
    Electronic Resource
    Electronic Resource
    Time-resolved spectra of excited-state absorption in Er3+ doped YAlO3 (1992)
    Springer
    Applied physics 54 (1992), S. 404-410 
    Details
    ISSN: 1432-0630
    Keywords: 07.65 ; 35.00 ; 42.55 R
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract A pump- and probe-beam technique is used for measuring time-resolved excited-state absorption (ESA) and stimulated-emission (SE) spectra of Er3+ doped YAlO3. The Er3+ 4 I 15/2 → 4 F 7/2 transition of the sample is excited at 488 nm by an excimer laser pumped dye laser. The ESA and SE of broadband xenon flashlamp light is monitored between 300 and 860 nm by an optical multichannel analyzer (OMA). The analysis of the experimental results provides information on the effective cross sections σESA and σSE originating from several levels and on the populations of these levels. To our knowledge this represents the first detailed investigation of time-resolved ESA and SE over a broad spectral range in rare-earth doped materials.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00324164
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Titrimetric determinations of cryptands and cryptates (1979)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 298 (1979), S. 358-362 
    Details
    ISSN: 1618-2650
    Keywords: Best von Kryptanden, Kryptaten ; Volumetrie ; HCl, Metall-Standardlösung, Standardzugabeverfahren
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary Using bromocresol green as a visual endpoint indicator solutions of the cryptands [2.2.1] and [2.2.2] can be determined by titration with HCl in the concentration range of 10−1–10−3 M with relative standard deviations of 0.2–0.4 %. If both cryptand and cryptate are present in one solution, then the sum of them can be determined titrimetrically in the same way. It is also possible to determine the contents of [2.2.1] and [2.2.2] by using a calcium or barium standard solution and the unknown cryptand solution as a titrant. By evaluation of the pH-curve thus obtained, the endpoint of the titration can be determined. In the concentration range of 10−1–10−2 M relative standard deviations of about 0.5% are obtained. [2.2.1] cryptand solutions are determined by using the standard addition technique of Gran with a calcium chloride solution. An ion-selective electrode is used as a probe for calcium ions. If this method is applied, the relative standard deviation in the range of 10−2–10−4 M solutions is approximately 3%. With this technique cryptand can be analysed even when cryptate is present in the solution.
    Notes: Zusammenfassung Bei Verwendung von Bromkresolgrün als visueller Endpunktindicator kann man [2.2.1] und [2.2.2] Kryptandlösungen im Konzentrationsbereich 10−1–10−3 M mit relativen Standardabweichungen von 0,2–0,4% mit HCl titrieren. Wenn in einer Lösung sowohl Kryptand als auch Kryptat vorhanden ist, ist die Summe beider Substanzen auf die gleiche Weise bestimmbar. [2.2.1] und [2.2.2] können auch dadurch bestimmt werden, daß eine Calciumbzw. Barium-Standardlösung mit der Kryptandlösung unbekannter Konzentration titriert wird. Die Auswertung der dabei erhaltenen pH-Kurve ergibt den Titrationsendpunkt, wobei hierdurch im Konzentrationsbereich von 10−1–10−2 M Kryptandlösungen relative Standardabweichungen von etwa 0,5% erreicht werden. [2.2.1] Kryptandlösungen werden außerdem mit der Standard-Additionstechnik nach Gran bestimmt, wobei eine calciumselektive Elektrode als Indicatorelektrode dient. Dabei werden im Konzentrationsbereich von 10−2–10−4 M relative Standardabweichungen von etwa 3 % erhalten. Diese Methode kann auch überschüssigen Kryptand neben Kryptat bestimmen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00482014
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Spurenbestimmung von La, Ce und Nd in anorganischen Matrices durch massenspektrometrische Isotopenverdünnungsanalyse (1982)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 310 (1982), S. 146-153 
    Details
    ISSN: 1618-2650
    Keywords: Best. von Lanthan, Cer, Neodym in Anorg. Material, Glas, Praseodymoxid, Aluminium ; Massenspektrometrie/Isotopenverdünnungstechnik ; Thermionisation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die Spurenbestimmung von La, Ce und Nd durch massenspektrometrische Isotopenverdünnungsanalyse in Laborglas, Praseodymoxid und Aluminiumfolien, welche nach Dotierung mit einem Lanthanoidisotop im Kernreaktor bestrahlt wurden, wird beschrieben. Die gemeinsame Abtrennung der zu analysierenden Lanthanoide aus der Glas- und Aluminiummatrix bzw. ihre Anreicherung gegenüber Praseodym erfolgt über Anionenaustauschchromatographie. Die Ionisation der Proben im Massenspektrometer wird mit Hilfe der Zweiband-Thermionisationstechnik durchgeführt, wobei die Abhängigkeit des Atomionen/ Oxidionen-Verhältnisses von den Ionenquellenbedingungen ermittelt wird. Es können La, Ce und Nd-Gehalte im untersten μg/g-Bereich mit relativen Standardabweichungen zwischen 1–14% bestimmt werden. In den im Kernreaktor bestrahlten Aluminiumproben kann u.a. das 140Ce-Isotop neben einer über 400fach größeren Menge an 139La ermittelt werden. Wesentlicher Vorteil der massenspektrometrischen Isotopenverdünnungsanalyse ist, daß die erhaltenen Ergebnisse relativ richtig sein sollten und auch Isotope bestimmt werden können.
    Notes: Summary The trace determination of La, Ce and Nd by mass spectrometric isotope dilution analysis in laboratory glass, in praseodymium oxide and in aluminium foils which were irridiated in a nuclear reactor after adding a lanthanide isotope is described. The separation of the lanthanides to be analysed from the glass and the aluminium matrix as well as the enrichment from the praseodymium matrix was achieved by anionic exchange chromatography. Ionization of the samples in the mass spectrometer was carried out by double filament thermal ionization technique. The dependence of the atomic ions and lanthanide oxide ions on the ion source conditions was determined. La, Ce and Nd contents in the lower μg/g range could be determined with relative standard deviations of 1–14%. In one of the aluminium foils, the isotope 140Ce e.g. could be analysed in presence of a more than 400 times higher 139La amount. The essential advantage of mass spectrometric isotope dilution analysis is the accuracy of the results and the possibility to analyse isotopes as well as element contents.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00481952
    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...