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  • 2015-2019  (7)
  • 2005-2009  (41)
  • 2000-2004  (47)
  • 1990-1994  (11)
  • 1945-1949  (4)
  • 1925-1929  (5)
  • 1910-1914  (3)
  • 1
    Electronic Resource
    Electronic Resource
    Minority-carrier kinetics in heavily doped GaAs:C studied by transient photoluminescence (2002)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 91 (2002), S. 5072-5078 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Room-temperature photoluminescence decay time measurements in heavily doped GaAs:C-layers designed as base layers for heterojunction bipolar transistors are reported. These measurements provide access to nonequilibrium minority carrier lifetimes that determine the current gains of those devices. By systematically studying transient luminescence spectra over a wide range of excitation densities between 1013 and 1018 cm−3, we demonstrate the importance of carrier trapping processes at low excitation densities. Optimized excitation conditions that achieve trap saturation but also avoid stimulated emission are found for densities of (1–3)×1017 cm−3/pulse. Detection is limited to a spectral window well above the energy gap (beyond 1.5 eV). Values for both Auger and radiative recombination coefficients are given. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1456244
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  • 2
    Electronic Resource
    Electronic Resource
    Polarisationserscheinungen bei der stufenweisen Anregung der Fluoreszenz von Quecksilberdampf (1929)
    Springer
    The European physical journal 54 (1929), S. 811-818 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Zusammenfassung Die Fluoreszenz des Quecksilberdampfes bei polarisierter stufenweiser Anregung mit den Linien 2537 und 4047 unter Stickstoffzusatz wird untersucht und die dabei auftretenden Polarisationseffekte und Intensitätsversehiebungen der Fluoreszenzlinien 5461, 4358 und 4047 werden beschrieben und erklärt. Einige wichtige Folgerungen und weitere Untersuchungsmöglichkeiten werden diskutiert.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01341742
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of Carbon and Nitrogen Implantation on the Properties of Silicon Nitrides (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 290 (July 2005), p. 160-166 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: This study focused on the effect of ion implantation on the mechanical properties ofsilicon nitride based ceramics. The examined materials contained 4% Al2O3, 6% Y2O3 and, in some cases, graphite or black carbon additives. Fully densified bodies were manufactured by two-step hot isostatic pressing, in other experiments pressureless sintering gave porous ceramics. Nitrogen or carbon ions with 190 keV or 350 keV were implanted, a part of samples obtained laser treatments for comparison. Measurements of elastic modulus, four point and three point bending strength were carried out at room temperature on sintered samples, partially sintered samples and sintered and oxidised samples. Carbon or nitrogen implantation influenced the strength of partially sintered samples only if the density was over 80%. Both the implantation of carbon or nitrogen ions and the laser treatment affected the bend strength of sintered samples, enlarging the power introduced itsvalue first increased than decreased. Implantation slightly decreased the strength of samples oxidised at 1400 °C. Comparison of different mechanical characteristics may support a better understanding of phenomena during ion beam implantation or laser irradiation
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/49/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.290.160.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Gold electrodes from recordable CDs for mercury quantification by flow injection analysis (2000)
    Springer
    Fresenius' journal of analytical chemistry 366 (2000), S. 444-448 
    Details
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The development of a new methodology for the construction of very efficient flow cells for mercury detection by potentiometric stripping analysis, employing the thin gold layer of recordable CDs as working ¶electrode is reported. This new source of electrodes (CDtrodes) show very attractive performance, similar to that obtained with commercial gold electrodes, with superior versatility. The low cost of this new source of “gold electrodes” allows a frequent replacement of the electrode, avoiding cumbersome clean-up treatments. Various experimental parameters have been optimized to yield low detection limits (0.25 ng/mL of mercury for 5 min deposition at 0.3 V) and good precision (standard deviation of 1.9% was obtained for 15 repetitive measurements using 10 ng/mL of mercury). Standard curves were found to be linear over the range of 0.5–100 μg L–1 of mercury. The flow cells developed were used for the quantification of mercury in oceanic and tap water.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002160050090
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  • 5
    Electronic Resource
    Electronic Resource
    Hydroxyapatite nucleation on Na ion implanted Ti surfaces (2000)
    Springer
    Journal of materials science 19 (2000), S. 1029-1031 
    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:1006782818468
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  • 6
    Electronic Resource
    Electronic Resource
    Über binäre flüssige Mischungen X (1949)
    Springer
    Monatshefte für Chemie 80 (1949), S. 510-516 
    Details
    ISSN: 1434-4475
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00899155
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  • 7
    Electronic Resource
    Electronic Resource
    Mischungen von primären aliphatischen Alkoholen mit Chlorex und anderen organischen Stoffen (1949)
    Springer
    Monatshefte für Chemie 80 (1949), S. 749-758 
    Details
    ISSN: 1434-4475
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Zusammenfassung 1. Die untersuchten Chlorex-n-Alkoholsysteme zeigen hohe endotherme Mischungswärmen, die sich mit steigender Temperatur noch vergrößern. 2. Bei den niederen Alkoholsystemen treten Volumkontraktionen, bei den höheren Volumdilatationen auf. 3. Das System Chlorex-Methanol ist in flüssiger Phase unbeschränkt mischbar; sämtliche anderen Alkoholsysteme besitzen Mischungslücken. Die KLT-Werte steigen mit wachsendem Molgewicht des Alkohols an, und zwar ab C3H7OH ziemlich regelmäßig oszillierend. 4. Mit steigendem Molgewicht der Alkohole verschieben sich die ΔH max-Werte in das Alkohol-reichere, dagegen die ΔV max- und KLT-Werte ins Chlorex-reichere Gebiet. Die Systemreihen n-Alkohole-Benzol und n-Alkohole-n-Hexan weisen ganz ähnliche Anomalien auf, die offenbar in der Assoziation und dem mit der Temperatur veränderlichen Assoziationsgrad der Alkoholkomponente begründet sind. 5. Chlorex stellt für die niederen n-Alkohole ein selektives Lösungsmittel dar, währendAnilin mit denselben Alkoholen (bis C8H17OH) in flüssiger Phase unbeschränkt mischbar ist.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00898375
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  • 8
    Electronic Resource
    Electronic Resource
    Über die Mischbarkeit von Chlorex (β,β′-Dichlordiäthyläther) mit Halogenkohlenwasserstoffen (1949)
    Springer
    Monatshefte für Chemie 80 (1949), S. 856-863 
    Details
    ISSN: 1434-4475
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00898388
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  • 9
    Electronic Resource
    Electronic Resource
    Die Mischungen von Chlorex mit n-Oktan und 2,2,4-Trimethylpentan (1949)
    Springer
    Monatshefte für Chemie 80 (1949), S. 572-582 
    Details
    ISSN: 1434-4475
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Zusammenfassung 1. Die Mischungswärmen der SystemeChlorex—n-Oktan undChlorex—i-Oktan (2,2,4-Trimethylpentan) sind bei 25°C sehr starkendotherm (495, bzw. 440 cal/Mol Mischung bei XChl=0,300) und besitzen einennegativen Temperaturkoeffizienten. 2. Das SystemChlorex—n-Oktan zeigt bei 20°C — das heißt bei eben noch vollständiger gegenseitiger Löslichkeit — eine kleine Volums-dilatation, die sich mit steigender Temperatur (35°) vorerst nur wenig ändert, dann aber (50°) deutlich ausgeprägt ist. Das SystemChlorex—i-Oktan weist bei 20°C — also noch sehr nahe der KLT — eine geringfügige Volumskontraktion auf, die bei 35° noch ebenso gering ist, dann aber (50°) bemerkenswert groß wird. 3. Das Dipolmoment desChlorex-Einzelmoleküls errechnet sich bei 20°C zu 2,47 (Debye) in n-Oktan und 2,60 (Debye) in i-Oktan. 4. Die Zustandsdiagramme beider Systeme sind sehr ähnlich und zeigen tiefe, fast über den gesamten Konzentrationsbereich laufende Zonen beschränkter Mischbarkeit. Die KLT desChlorex—n-Oktan-systems liegt bei+19,7°C, die des i-Oktansystems bei+18,2°C. Für die Schmelzwärme vonChlorex finden wir als Mittelwert 2070 cal/Mol.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00899161
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  • 10
    Electronic Resource
    Electronic Resource
    Surface sensitivity of ion implanted titanium to hydroxyapatite formation (2000)
    Springer
    Journal of materials science 19 (2000), S. 443-445 
    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:1006759309358
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