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  • 1
    Electronic Resource
    Electronic Resource
    An improved maximum likelihood method for classifying mass spectral data
    Amsterdam : Elsevier
    International Journal of Mass Spectrometry and Ion Physics 47 (1983), S. 325-328 
    Details
    ISSN: 0020-7381
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0020-7381(83)87200-3
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  • 2
    Electronic Resource
    Electronic Resource
    Hall effect studies on strontium and ytterbium under high pressures
    Amsterdam : Elsevier
    Physics Letters A 34 (1971), S. 371-372 
    Details
    ISSN: 0375-9601
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0375-9601(71)90919-4
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  • 3
    Electronic Resource
    Electronic Resource
    Das ESR-Signalg=1,957 von Zinkoxid (1966)
    Springer
    The European physical journal 5 (1966), S. 371-379 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Résumé La linie ESRg=1,957, caractéristique pour la poudre de ZnO propre activée, a été recherchée. On peut montrer, que la linie bien connue consiste en deux parts (g h=1,9555 etg a=1,9580). Les deux centres paramagnétiques peuvent identifiés en comparant des qualités de luminescence. La part „h” avec lag-valeurg h plus petit provient des pièges à trous remplis, c.-à-d. des ions oxygènes interstitiels. Le deuxième signal partiel „a” provient des activateurs pas ionisés, c.-à-d. des défauts oxygènes occupés d'un électron.
    Abstract: Abstract The ESR-lineg=1,957 of self-activated ZnO-powder is investigated. It can be shown that the well-known ZnO-line consists of two parts (g h=1,9555 andg a=1,9580). The two paramagnetic centers can be identified by considering corresponding luminescence properties. The part „h” with the lowerg-valueg h is given by the filled hole traps, i.e. by oxygen-ions on interstitual places. The second part of the ESR-signal results from activators, which are not ionized, i.e. oxygen defects filled by one electron.
    Notes: Zusammenfassung Es wird die für eigenaktiviertes ZnO-Pulver charakteristische ESR-Linie beig=1,957 untersucht. Es kann gezeigt werden, daß die bekannte ZnO-Linie aus zwei Anteilen besteht (g h=1,9555 undg a=1,9580). Die beiden paramagnetischen Zentren können durch Analogien zu Lumineszenzeigenschaften identifiziert werden. Der Anteil „h” mit dem kleinereng-Faktorg h stammt von den gefüllten Löcherhaftstellen, d. h. von: Sauerstoff-Zwischengitterionen. Das zweite Teilsignal „a” rührt von den nicht-ionisierten Aktivatoren, d. h. von mit einem Elektron besetzten Sauerstofflücken her.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02422887
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  • 4
    Electronic Resource
    Electronic Resource
    An artificially anisotropic thermoelectric material with semiconducting and superconducting layers (2000)
    Springer
    Semiconductors 34 (2000), S. 1214-1218 
    Details
    ISSN: 1063-7826
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The thermoelectric parameters of an artificially anisotropic material composed of semiconducting and superconducting layers are considered. The transverse thermoelectric figure of merit and the sensitivity of a sensor responding to small heat fluxes are calculated. The use of high-temperature superconductor layers appreciably changes the optimal geometry of the layered structure (layer inclination angle and thickness ratio) compared with normal conductors. The figure of merit and the sensitivity of a thermoelectric element with superconducting layers exceed the respective parameters of a structure with metallic layers by a factor of 2–3.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1317586
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  • 5
    Electronic Resource
    Electronic Resource
    Charakterisierung chemisch modifizierter Kieselgele für die Hochleistungsflüssigkeits-Chromatographie mit der Fourier-Transform-Infrarot-Spektroskopie (1983)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 314 (1983), S. 469-471 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die FTIR-Spektren eines chemisch modifizierten Kieselgels für die HPLC sowie die Spektren der Ausgangsmaterialien wurden mit Hilfe von KBr-Preßlingen aufgenommen. Durch Subtraktion des Kieselgelspektrums von dem des chemisch modifizierten Kieselgels konnte das IR-Spektrum des chemisch gebundenen organischen Liganden erhalten werden, welches weitgehend mit dem der reinen Verbindung identisch war. Die FTIR-Methode wird mit einer naßchemischen Analysenmethode für modifizierte Kieselgele vergleichend bewertet.
    Notes: Summary The Fourier-transform infrared (FTIR) spectrum of a chemically modified silica for high-performance liquid chromatography (HPLC) as well as the spectra of the starting compounds were recorded by using the KBr-pellet technique. Subtraction of the silica spectrum from that of the modified one leads to the spectrum of the bonded ligand, which was nearly identical with the spectrum of the pure ligand. The FTIR-method is compared with a chemical method of analysing silicas.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00481841
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  • 6
    Electronic Resource
    Electronic Resource
    Charakterisierung eines schweren Kohleverflüssigungsproduktes durch kombinierte Hochleistungsflüssigkeitschromatographie/Massenspektrometrie (1982)
    Springer
    Chromatographia 15 (1982), S. 231-235 
    Details
    ISSN: 1612-1112
    Keywords: High-performance liquid chromatography (HPLC) ; Donor-acceptor complex chromatography (DACC) ; Low-voltage mass spectrometry (or MS) ; Coal liquefaction products
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Ein Recycleöl wurde semipräparativ auf einer Tetrachlorphthalimidopropylsilan-modifizierten Säule hochleistungsflüssigkeitschromatographisch in 23 Fraktionen getrennt. Zur Identifizierung der Hauptkomponenten wurden die Fraktionen mit einer einfachen Präparationstechnik in das Massenspektrometer eingebracht und die Molekülionenspektren unter Benutzung der Low Voltage-Technik gemessen. Vorteilhaft für die Charakterisierung hochsiedender technischer Gemische ist die Tatsache, daß die chromatographische Trennung streng nach der Anzahl der aromatischen Ringe im Molekül erfolgt, weitgehend unabhängig von der Alkylsubstitution.
    Notes: Summary A recycle-oil was separated on a semi-preparative scale into 23 fractions by means of HPLC with a tetrachlorophthalimidopropylsilane-modified column. Mass spectrometry enabled a more or less complete identification of the main components. For this, the fractions were introduced into the mass spectrometer by a simple preparation technique, followed by measurement of the molecule ion spectra by the low voltage technique. An advantage of HPLC for the characterization of high-boiling oil mixtures is that separation takes place almost exclusively accoding to the number of aromatic rings in the molecule and is largely independent of the degree of alkylation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02265653
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  • 7
    Electronic Resource
    Electronic Resource
    Chromatographie par complexe de transfert de charge. Application à l'analyse d'hydroliquéfiats du charbon par HPLC (1985)
    Springer
    Chromatographia 20 (1985), S. 543-554 
    Details
    ISSN: 1612-1112
    Keywords: High-performance liquid chromatography ; Rapid scanning UV-detector ; Low-voltage mass spectrometry ; Coal liquefaction products
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Résumé L'analyse de coupes lourdes (huile de distillation sous vide et huile issue du séparateur à chaud) provenant de l'hydroliquéfaction catalytique du charbon a été réalisée par mise en ouvre de différentes techniques chromatographiques. L'identification des principales structures résulte de l'application de la chromatographie par couplage de transfert de charge en mode HPLC et des spectroscopies UV et de masse.
    Notes: Summary A Vacuum gas oil and the corresponding residue of a coal liquefaction product were investigated by means of HPLC and MS. Nearly a complete identification was performed by chromatographic, UV-spectroscopic methods and MS.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02312174
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  • 8
    Electronic Resource
    Electronic Resource
    PVD-beschichtete Tribosysteme bei reversierender Gleitbeanspruchung (1993)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 24 (1993), S. 160-167 
    Details
    ISSN: 0933-5137
    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: PVD-coated tribosystems at reciprocating slidingThe aim of the investigation is to increase the life time of machinery elements of steel, sliding under high contact pressure, by PVD-coating of one of the surfaces.The three-step tribological testprogram includes a fundamental test, a model test under real conditions and a suitability test with real parts. The coefficient of friction and wear depends on substrate material, deposition variance, coating structure and surrounding conditions.Hard coatings: They enlarge the life time of lubricated systems considerably (μ ≤ 0,1). Without lubrication the coefficient of friction is relatively high (μ ≥ 0,5), which results in a short life time.Coatings with low friction: Soft metals and chalchogenides on supporting hard coatings only reduce the friction for a short time. Metal carbon coatings yield the lowest coefficient of friction (μ = 0.2) and the greatest life time. In the range up to 1500 N/mm2 the pressure has a small influence on the life time. When the coated contact surface slides against an unmachined forged surface, the coating will be damaged after a short time due to local over oad at asperities.
    Notes: Das Ziel der Untersuchungen ist die Steigerung dcr Lebensdauer von unter relativ großen Pressungen gleitend beanspruchten Maschinenelementen aus Stahl durch PVD-Beschichtung eines der Kontaktpartner. Die tribologische Prüfung erfolgt dreistufig durch grundlagennahe Modellprüfung, beanspruchungsähnliche Modellversuche und Versuche am Bauteil (Steckkette) unter Praxisbedingungen. Substratwerkstoffe, Schichtsystem und Umgebungsbedingungen beeinflussen das Reibungs- und Verschleißverhalten wesentlich.Hartstoffschichten: Im geschmierten System verlängern sie die Lebensdauer erheblich (μ ≤ 0,1). Ohne Schmierung ist die Reibungszahl relativ groß (μ ≥ 0,5), was zum frühzeitigen Versagen des Tribosystems führt.Reibungsmindernde Schichten: Weichmetalle und Chalkogenide auf hartstoffbeschichteten Systemen vermindern die trockene Reibung nur kurzzeitig. Die kleinste Reibungszahl (μ = 0,2) und die größte Lebensdauer erbringen die Metall-Kohlenstoff-Schich-ten. Im Bereich bis zu 1500 N/mm2 hat die Pressung nur einen kleinen Einfluß auf die Lebensdauer. Bei Reibung gegen unbearbeitete, geschmiedete Steckkettenelemente wird die Schicht infolge lokaler Überbeanspruchung an Punktkontakten frühzeitig geschädigt.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19930240315
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  • 9
    Electronic Resource
    Electronic Resource
    Neues Verfahren zur Auswertung hochaufgelöster Molekülionen-Massenspektren von hochsiedenden Kohlenwasserstoffgemischen (1985)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 320 (1985), S. 692-693 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00497161
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  • 10
    Electronic Resource
    Electronic Resource
    Development of a quantitative FI-MS technique for the characterization of high- and nonboiling saturated hydrocarbon mixtures (1987)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 329 (1987), S. 35-38 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Using a saturated non-boiling hydrocarbon mixture, the influence of two parameters on the results of field ionization mass spectrometry (FI-MS) measurements was studied: (a) the potential difference between the FI emitter and the counterelectrode; (b) the emitter temperature. Variation of the potential difference had only a minor effect on the average molecular mass measured and had no evident effect on the relative ring number distribution in the sample. In contrast, when the emitter temperature was increased, higher average molecular masses were recorded. Moreover, the average molecular masses shifted to higher ring numbers. In order to control the relationship between the described influences during mixture analysis, measuring instructions have been developed that enable the quantitative analysis of unknown saturated samples. However, average molecular mass of the mixture must be known.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00487537
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