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  • 1990-1994  (8)
  • 1970-1974  (3)
  • 1994  (8)
  • 1973  (3)
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  • 1990-1994  (8)
  • 1970-1974  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    Raman and x-ray studies of Ce1−xRExO2−y, where RE=La, Pr, Nd, Eu, Gd, and Tb (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 2435-2441 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Powdered samples of the type Ce1−xRExO2−y, where RE=La, Pr, Nd, Eu, Gd, and Tb, are synthesized over the range 0≤x≤0.5 starting from nitrate solutions of the rare earths. X-ray diffraction and Raman scattering are used to analyze the samples. These compounds, at least in the low doping regime and for strictly trivalent dopants, form solid solutions that maintain the fluorite structure of CeO2 with a change in lattice constant that is approximately proportional to the dopant ionic radius. The single allowed Raman mode, which occurs at 465 cm−1 in pure CeO2, is observed to shift to lower frequency with increasing doping level for all the rare earths. However, after correcting for the Grüneisen shift from the lattice expansion, the frequency shift is actually positive for all the strictly trivalent ions. In addition, the Raman line broadens and becomes asymmetric with a low frequency tail, and a new broad feature appears in the spectrum at ∼570 cm−1. These changes in the Raman spectrum are attributed to O vacancies, which are introduced into the lattice whenever a trivalent RE is substituted for Ce4+. This conclusion is supported by a simple model calculation of the effects of O vacancies on the Raman spectrum. The model uses a Green's function technique with the vacancies treated as point defects with zero mass.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.357593
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  • 2
    Electronic Resource
    Electronic Resource
    Hole kinetics in metal-oxide-semiconductor oxides investigated by a hot-carrier degradation experiment (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 4046-4054 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In this work fast-changing bias conditions in the nanosecond regime are applied to n-channel metal-oxide-semiconductor field effect transistors. Short bunches of holes are injected into the silicon dioxide (SiO2) and subjected to different field conditions which influence the final trapping. It is shown that by this experiment the kinetics of hole movement in the oxide can be studied. The model of polaron formation originating from work on high-energy irradiation is essentially confirmed. Evidence for a prepolaron formation phase is found, however, with a smaller scattering length for which we propose the different hole formation process in this experiment to be responsible. On this basis the interface trap formation by injected holes is investigated. It is found that not the number of trapped holes but the one of injected holes is decisive for interface trap formation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.356028
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  • 3
    Electronic Resource
    Electronic Resource
    Preparation of crystallographically aligned layers of silicon carbide by pulsed laser deposition of carbon onto Si wafers (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 65 (1994), S. 2171-2173 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: It is demonstrated that SiC films can be deposited epitaxially on [001] and [111] Si wafers by excimer laser ablation of just a carbon target, in vacuum, at deposition temperatures as low as 1100 °C. Diffraction studies show that the SiC films have the same crystalline orientation as the substrates. The film growth on the Si substrate to thicknesses as large as 4000 A(ring) with no significant excess carbon indicates that in addition to reaction of the carbon in the plume with Si of the substrate, there is transport of Si within the SiC film. For continued deposition beyond this thickness a carbon layer will form. © 1994 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.112998
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  • 4
    Electronic Resource
    Electronic Resource
    Prediction of Yield for Specific Locations in German Winter-wheat Trials (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Plant breeding 113 (1994), S. 0 
    Details
    ISSN: 1439-0523
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: The interaction between varieties and environment can make the prediction of crop performance difficult. The farmer is obviously interested in achieving optimum production within the particular growing environment of his farm, thus, this paper investigates if crop performance predictions can be improved by making information from other locations into account. The investigation is based on yield data from winter wheat resulting from official German variety-performance tests. The predictors are based on the single location (control), unweighted means, principal components, and weighted means, produced using regression coefficients as weights. These predictors were tested on an independent data set from another year. For the given yield data in winter wheat, the overall mean proved to be the best, which suggests that prediction for all locations should be the same, and predictors for specific locations cannot, therefore, be recommended. The main reason for this is the relatively small interaction between genotype and location, in comparison to the second-order interaction between genotypes, locations and years.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1439-0523.1994.tb00711.x
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  • 5
    Electronic Resource
    Electronic Resource
    The Role of α2M Receptor/LRP in Chylomicron Remnant Metabolism (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 737 (1994), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1994.tb44301.x
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  • 6
    Electronic Resource
    Electronic Resource
    Nitrogen-15 solid-state NMR studies on the cure and degradation of polyimide films under temperature and humidity stress (1994)
    s.l. : American Chemical Society
    Macromolecules 27 (1994), S. 279-286 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00079a041
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  • 7
    Electronic Resource
    Electronic Resource
    Stich-Dynamik im menschlichen Körpergewebe (1973)
    Springer
    International journal of legal medicine 73 (1973), S. 295-300 
    Details
    ISSN: 1437-1596
    Keywords: Gewaltsamer Tod, Stich ; Stich-Verletzungen ; Stich-Dynamik
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Law
    Description / Table of Contents: Zusammenfassung 70 genormte Pendel-Stich-Versuche mit einem Brotmesser an den Oberschenkeln von 7 Leichen werden an Hand von synchron aufgezeichneten Weg-Zeit-Kurven und Widerstand-Zeit-Kurven ausgewertet. In 10 Fällen werden die Ergebnisse mit Hilfe von Filmaufnahmen einer Hochfrequenzkamera überprüft. Für 5 markante Punkte der Kurven werden in einer Tabelle die Mittelwerte und Extremwerte (Weg, Widerstand und Zeit) mitgeteilt. Nach den Mittelwerten wird ein für die Stich-Serie charakteristisches Diagramm erstellt und interpretiert. Die Initialspitze der Widerstand-Zeit-Kurven kennzeichnet mit dem von der Messerspitze zurückgelegten Weg von durchschnittlich 2,5 cm die maximale Impression der Haut und die beginnende Perforation. Der Gewebswiderstand in der Tiefe der Muskulatur ist unter unseren dynamischen Bedingungen durchschnittlich etwas größer als der Eindringwiderstand. Die beschriebene Versuchsanordnung ist geeignet, differenzierte quantitative Aufschlüsse über die Stich-Dynamik im Zielbereich zu geben.
    Notes: Summary 70 normed pendulum stabbing tests with a bread-knife on the thighs of 7 corpses were assessed by synchronically registered distance-time and resistance-time-tracings. In 10 instances the results were checked by means of film recordings with a high speed camera. 5 characteristic points of these curves are given in a table showing average values and extreme values (distance, resistance, time). Using the average values, a diagram showing the characteristica for this stabbing-series, was made and interpreted. The initial peak of the resistance-time curves marks maximum impression of the skin and beginning puncture. During these events the knife's point moves an average of 2.5 cm. Tissue resistance in the depth of the muscle is — at our conditions of dynamics — generally higher than the skin-resistance. The test arrangements described here are suited to yield differentiated quantitative results as to stabbing dynamics in the target area.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01856995
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  • 8
    Electronic Resource
    Electronic Resource
    In situ ellipsometric study of a palladium catalyst during the oxidation of methane (1994)
    Springer
    Catalysis letters 29 (1994), S. 329-338 
    Details
    ISSN: 1572-879X
    Keywords: ellipsometry ; methane ; palladium ; palladium oxide ; oscillations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Ellipsometry is used to follow the growth of a PdO layer on the surface of a thick Pd-film catalyst during methane oxidation at ∼ 500°C. The oxide layer that develops under rich conditions (excess CH4) is quite porous and roughens with time. Little CO is formed during this period, but the CO2 formation rate increases until spontaneous oscillations develop, which correlate with changes in the ellipsometric data. These changes indicate that the porous oxide rapidly converts to a metal-rich state, which has decreased catalytic activity, and then slowly reoxidizes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00807112
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  • 9
    Electronic Resource
    Electronic Resource
    Book reviews (1973)
    Springer
    Applied physics 1 (1973), S. 290-292 
    Details
    ISSN: 1432-0630
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00889779
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  • 10
    Electronic Resource
    Electronic Resource
    Peculiarities of innervation in chromatophore muscle cells ofLoligo vulgaris (1973)
    Springer
    Marine biology 19 (1973), S. 224-226 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The contractile cortex in muscle cells of the large brown chromatophore organs inLoligo vulgaris features a small open slit in its proximal portion. The slit accommodates a nerve fiber, penetrating into the central core of the muscle cell. The functional properties of the fiber, in relation to the contraction of the muscle cell, are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02097142
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