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
    Electronic Resource
    Electronic Resource
    An acoustoelastic method for measuring residual stresses in slightly orthotropic materials (1991)
    Springer
    Acta mechanica solida Sinica 4 (1991), S. 355-362 
    Details
    ISSN: 0894-9166
    Keywords: acoustoelasticity ; ultrasonics ; residual stress measurement
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract An acoustoelastic method for residual stress measurement in slightly orthotropic materials by using ultrasonic longitudinal and shear waves is presented. A shear transducer with small vibrator 2 × 2mm2 is developed and described, and the measurement of 2-D residual stresses in a seam welded plate was carried out by this method with the shear transducer developed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02207584
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Application of an on-line preconcentration system in simultaneous ICP-AES (1992)
    Springer
    Microchimica acta 106 (1992), S. 191-201 
    Details
    ISSN: 1436-5073
    Keywords: ICP-AES ; preconcentration ; standard reference materials ; trace element analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A PC-controlled on-line preconcentration system (TRACECON) developed by Knapp et al. [11], was connected to a JY-70 Plus simultaneous ICP spectrometer to preconcentrate on-line seven trace elements (Cu, Fe, Zn, Cr, Ni, Mn, V) in biological and environmental samples. EDTrA-cellulose was used as column material. The elemental concentrations were determined by simultaneous ICP-AES. The effect of pH of the sample solution on the enrichment was studied. It was found that the recoveries of chromium and iron depend strongly on the pH of the sample solution. All the elements mentioned were recovered quantitatively at pH 4.0±0.1. The flow rates of sample solution and element solution were optimized. The enrichment factors for seven elements at 5 ml loading volume range from 3.9 for Cu to 7.9 for Zn. The detection limits of all seven elements were improved. The accuracy of the method was tested by the analysis of a number of CRMs of NIST, BCR and NIES. Most results are in good agreement with the certified values.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01242090
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Study on the PTFE closed-vessel microwave digestion method in food elemental analysis (1988)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 332 (1988), S. 45-47 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A closed PTFE vessel microwave digestion method is described for the HNO3/H2O2 digestion of food samples. 0.2–0.3 g of powdered samples are completely digested in 44 ml PTFE digestion vessels by 2 ml of 70% HNO3 and 1 ml of 30% H2O2 within 2 min at 100% full power (500 W). After air-cooling for 10 min in a refrigerator at — 25°C the digestion solution is diluted to 25ml. The total elemental concentrations of Ca, Mg, Cu, Fe, Mn and Zn are determined by sequential ICP-AES. The accuracy of the procedure was tested by analysis of 3 SRMs. The results are in good agreement with certified values.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00487029
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Determination of boron in soils by sequential scanning ICP-AES using side line indexing method (1986)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 325 (1986), S. 534-538 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary This paper describes the method for the determination of boron in soils directly by sequential scanning ICP-AES using the side line indexing method. In order to overcome the spectral wing interference caused by iron which is the one of the major matrix constituents the side line indexing method was used, in which the B 249.678 nm line is found by referencing the side line Fe 249.653 nm. The background correction position was chosen to allow the interference from iron to be constant. The sample dissolution method was investigated to avoid losses of boron as BF3 in the HNO3/HClO4/HF decomposition procedure. Instead of mannitol orthophosphoric acid was added with HNO3/HClO4/HF mixed acids with the result of 100% recoveries of boron. NBS SRM 1571 (Orchard Leaves) spiked with iron was used to verify the accuracy of this method.
    Notes: Zusammenfassung Um die durch Eisen (einer der Hauptbestandteile) verursachte Störung zu überwinden, wurde das Verfahren der Nebenlinien-Auswertung eingesetzt, wobei die Borlinie 249,678 nm durch Vergleich mit der Nebenlinie Fe 249,653 nm gefunden wurde. Die Untergrundkorrektur wurde so gewählt, daß die Eisenstörung konstant war. Zur Vermeidung von Borverlusten als BF3 beim Aufschluß mit HNO3/HClO4/HF wurde dem Säuregemisch an Stelle von Mannit Orthophosphorsäure zugesetzt. Dadurch konnten 100%ige Ausbeuten erzielt werden. Zur Überprüfung der Genauigkeit des Verfahrens diente das Referenzmaterial NBS SRM 1571 (Orchard Leaves) mit Zugaben von Eisen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00635682
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Preparation of β -SiAlON/nano-SiC composites (1997)
    Springer
    Journal of materials science 16 (1997), S. 1620-1621 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018593123754
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    ICP-Emissionsspektroskopie: Ein analytisches Verfahren zur Klärschlamm- und Bodenüberwachung in der Routine (1982)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 313 (1982), S. 213-216 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die Leistungsfähigkeit der ICP-Spektroskopie für den routinemäßigen Einsatz zur Klärschlamm-Bodenüberwachung hinsichtlich Schwermetallbelastung wird anhand von einigen ausgewählten Beispielen diskutiert. Ein Vergleich zwischen Königswasser- und Totalaufschluß für Klärschlammproben wird gezeigt. Für die Messungen wurde ein 16-Kanal ICP-Simultanspektrometer verwendet. Es ergab sich, daß die Methode für Überwachungsaufgaben — auch für große Probenzahlen sehr geeignet ist.
    Notes: Summary The capacity of ICP-spectroscopy for routine application to sludge and soil for supervising the contamination by heavy metals is discussed by means of some special examples. A comparison between “aqua regia” — and total ashing of sludge samples is presented. For these experiments a 16-channel ICP-spectrometer has been applied. It is concluded that this method is well suitable for supervision purposes — also for large numbers of samples.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00488859
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Determination of 14 elements in botanical samples by simultaneous inductively coupled plasma atomic emission spectrometry using standard reference material as multielement standard (1983)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 314 (1983), S. 671-677 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary This paper describes the method, in which NBS (National Bureau of Standards) SRM 1571 (Standard Reference Material, Orchard Leaves) was used as multielement standard to determine 14 elements including major, minor and trace elements in 2 NBS and 3 BCR (Community Bureau of Reference of the European Communities) botanical Standard Reference Materials by simultaneous ICP-AES (Inductively Coupled Plasma Atomic Emission Spectroscopy). Very good agreement between the results and the certified values or information data for 11 elements was found. The low values for Al, Ti and Fe were due to incomplete digestion (extraction inefficiency) by pressure ashing with nitric acid. But these three values can be regarded as the nitric acid soluble portion. The interelement interferences caused by the major components such as Ca, Mg, Al, Mn and Fe were discussed and corrected. The paired digestion solutions of NBS SRM 1571 were also used as quality control standards. Accurate and reliable analytical results can be obtained by this method.
    Notes: Zusammenfassung Eine Methode wird beschrieben, bei der NBS-Standard-Referenzmaterial SRM 1571 (orchard leaves) als Multielement-Standard zur Bestimmung von 14 Elementen (einschließlich Haupt-, Neben- und Spurenelemente) in 2 NBS- und 3 BCR-Standardmaterialien mit Hilfe der simultanen ICP-Atomemissionsspektrometrie verwendet wurde. Sehr gute Übereinstimmung der Ergebnisse mit den zertifizierten Werten wurde für 11 Elemente erhalten. Niedrige Werte für Al, Ti und Fe waren auf unvollständigen Aufschluß (unzulängliche Extraktion) bei der Veraschung unter Druck mit Salpetersäure zurückzuführen. Diese 3 Werte können jedoch als salpetersäurelöslicher Anteil angesehen werden. Die Interelement-Störungen durch die Hauptbestandteile (Ca, Mg, Al, Mn, Fe) werden diskutiert und korrigiert. Die paarweisen Aufschlußlösungen von NBS SRM 1571 wurden auch als Standards zur Qualitätskontrolle benutzt. Das Verfahren ergibt genaue und zuverlässige Ergebnisse.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00487356
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Incomplete-information capital market equilibrium with heterogeneous expectations and short sale restrictions (1996)
    Springer
    Review of quantitative finance and accounting 7 (1996), S. 119-136 
    Details
    ISSN: 1573-7179
    Source: Springer Online Journal Archives 1860-2000
    Topics: Economics
    Notes: Abstract This article extends Merton's (1987) asset-pricing model under incomplete information to consider the situation when investors' beliefs are divergent and short selling is restricted. The article finds that the diversity of beliefs increases the mean variance inefficiency of the market portfolio and the shadow cost of information. However, the inefficiency of the market portfolio due to divergent beliefs is mitigated by short-sale restrictions. The article also finds that the effect of firm size is intertwined with the residual return variance risk. Consistent with the findings of Levy (1978) and Carroll and Wei (1988), the residual return variance plays an important role in determining the risk and risk premium of each security. Finally, the shadow cost of information is larger and the equilibrium security return is higher when expectations are more diverse. And the effects of divergent beliefs on both information cost and required rates of returns are negatively related to the relative size of investor base for a particular security.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00243974
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Further investigation of an argon-hydrogen plasma in ICP-spectroscopy (1984)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 319 (1984), S. 229-239 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary The preliminary partial factorial design (orthogonal test) and modified simplex optimization as well as univariate method were used to investigate the effects of small amounts of hydrogen added to three gas flows of an argon plasma on the signal and background intensities as well as their ratios for fourteen elements. According to the behaviour in such a plasma these fourteen elements can be divided into five groups. By the addition of hydrogen signal and background intensities were increased. The signal-tobackground ratio is not the only criterion to judge the performance of a plasma. Comparing with the pure argon plasma, also the signal-to-background ratios of all elements except for Ca and Mg decreased under the optimum parameters for Ca which was the extreme case in this study. The detection limits of Fe, Cd, Cr, V, Ni and Be were improved due to the increased signal intensity and more stable plasma. Ca can easily be used as an indicator to judge the performance of an argon-hydrogen plasma especially in the determination of heavy metals. Altogether, the behaviour of the following elements was studied: Al, Be, Ca, Cd, Cr, Cu, Fe, Mg, Mn, Ni, Pb, Ti, V, Zn.
    Notes: Zusammenfassung Der Orthogonal-Test und eine modifizierte Simplex-Optimierung wurden verwendet, um den Einfluß kleiner Mengen von Wasserstoff in den 3 Gasströmen einer ICP-Anregungseinheit (Kühl-, Plasma- und Aerosolträgergas) zu bestimmen und optimale Betriebsbedingungen zu erarbeiten. 14 Elemente (Al, Be, Ca, Cd, Cr, Cu, Fe, Mg, Mn, Ni, Pb, Ti, V, Zn) wurden in einem Simultanspektrometer in diese Untersuchung einbezogen. Ein unterschiedliches Verhalten der verschiedenen Elemente auf die H2-Zumischung wird gezeigt. Das Signal/ Untergrund-Verhältnis (S/B) ist nicht als universelles Kriterium für das Plasma anzusehen, da trotz schlechterem S/B signifikant bessere Nachweisgrenzen auf Grund stabilerer Plasmaeigenschaften durch die H2-Zumischung erreicht werden können.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00487264
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Determination of arsenic, antimony, bismuth, selenium and tin in biological and environmental samples by continuous flow hydride generation ICP-AES without gas-liquid separator (1991)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 340 (1991), S. 41-47 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A simple continuous flow hydride generation system without conventional gas-liquid phase separator was developed for the determination of As, Se, Sb, Bi and Sn in biological and environmental samples by sequential ICP-AES with 1.5 kW power. The interchange of operating mode from normal solution nebulization to hydride generation or vice versa can easily be done without interrupting the plasma in this system. Two digestion methods were compared, i.e. the pressurized digestion with HNO3 in a closed vessel and HNO3/HClO4/H2SO4 acid digestion in an open system. It was found that further treatment is necessary after normal pressurized digestion for As determination in marine samples, e.g. mussel. Interferences, especially by copper and nickel were examined and completely eliminated up to 10 μg/ml by using a mixed reductant (3% NaBH4 and 2% KI) with lower flow rate as well as the sample solution media of 30% HCl (v/v) and 20% HNO3 (v/v). The effect of KI on the elemental oxidation states of As, Se and Sb is discussed. The accuracy of the method was validated by the analysis of a number of biological and environmental SRM's of NIST, BCR and NIES. Most results were in agreement with the certified values or reference values. The detection limits for these elements were in the range of 0.x ng/ml.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00324390
    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...