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  • Articles: DFG German National Licenses  (19)
  • 1995-1999  (19)
  • 1
    Electronic Resource
    Electronic Resource
    Formation of carbon nitride films with high N/C ratio by high-pressure radio frequency magnetron sputtering (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 78 (1995), S. 7416-7418 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Carbon nitride films were synthesized on Si(100) substrate using relatively high-pressure radio-frequency magnetron sputtering of a graphite target in a nitrogen ambient. The influences of the substrate temperature and pressure on deposition rate and the film composition ratio N/C and C–N bonding were investigated using x-ray photoelectron spectroscopy (XPS), and Fourier transform infrared spectroscopy (FTIR). The deposition rate had a maximum in the investigated pressure region and reduced as the substrate temperature increased. XPS spectra showed that the deposited films were very large N/C value up to 1.20, and unchanged after thermal treatment up to about 900 K, the latter confirmed by FTIR. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.360397
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Novel main-chain poly-carbazoles as hole and electron transport materials in polymer light-emitting diodes (1997)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 71 (1997), S. 1921-1923 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report the use of substituted main-chain poly-carbazoles as hole and electron transporting polymers for electroluminescence (EL) applications. The polymers are soluble in common organic solvents and high quality thin films are obtained by spin coating method. A single layer of hole or electron transfer devices with indium tin oxide anode and aluminum cathode shows current densities up to 40–50 mA/cm2, respectively, but no visible emission from either layer. Double-layer structures combining the hole and electron transfer polymers show strong emission originated from the electron transfer layer. The peak of double-layer EL spectrum is about 30 nm redshifted to the peak of corresponding photoluminescence spectrum, which may be due to the formation of an exciplex between the two layers. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.119981
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  • 3
    Electronic Resource
    Electronic Resource
    Analysis of transient photocurrents in Cu(In,Ga)Se2 thin film solar cells (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 82 (1997), S. 3572-3575 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A transient photocurrent measurement with a zero-field time-of-flight configuration was carried out on ITO/ZnO/CdS(n-type)/Cu(In,Ga)Se2(p-type, Eg=1.15 eV)/Mo/glass solar cell to get the information about the minority carrier transport on the Cu(In,Ga)Se2 film. The transient photocurrent was recorded after the incidence of a subnanosecond pulse light (500 nm wavelength) from the back side through the Mo thin film (〈0.5 μm). The analysis of the transient photocurrent was conducted by using the time-dependent diffusion current equation. Consequently, the values of 1.0 cm2/s, 100 ns, and 103 cm/s as the diffusion coefficient, the minority carrier lifetime, and the recombination velocity in the Cu(In,Ga)Se2/Mo interface, respectively, were obtained on the Cu(In,Ga)Se2 film. These data corresponded to the electron beam induced current line profile data, and the experimental data of J0, analyzed by current–voltage characteristics. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.365675
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  • 4
    Electronic Resource
    Electronic Resource
    Synthesis of nanometer-size silver coated polymerized diacetylene composite particles (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 68 (1996), S. 1288-1290 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report the synthesis of stable nanometer-size silver-coated polydiacetylene (PDA) particles. At first, an ethanol solution of diacetylene (DA) is dispersed into a Ag+ ion containing aqueous solution. Silver ions are attracted to –CCO− anions of DA, then monomer DA vesicles coated by silver ions are formed by a long-term ultrasonication treatment. The monomer DA vesicles are photopolymerized and the silver ions are photo-reduced simultaneously to form coated composite particles. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.115955
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Hepatoid adenocarcinoma of the pancreas (1999)
    Oxford, U.K. and Cambridge, USA : Blackwell Science Ltd
    Histopathology 35 (1999), S. 0 
    Details
    ISSN: 1365-2559
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2559.1999.0728f.x
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  • 6
    Electronic Resource
    Electronic Resource
    A comparative study of eosinophil isolation by different procedures of CD 16-negative depletion (1995)
    Oxford, UK : Blackwell Publishing Ltd
    Allergy 50 (1995), S. 0 
    Details
    ISSN: 1398-9995
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Eosinophils were isolated by the three methods of CD16-negative depletion: 1) magnetic beads, 2) fluorescence-activated cell sorter (FACS), and 3) complement reaction. Their purity, yield, and viability were compared. The second procedure produced well purity and viability (94.65 ± 1.51% and 94.98 ± 1.40%, respectively) but low yield of eosinophils (65.47 ± 2.47%). The viability of cells obtained by the third procedure was not efficient (80.83 ± 2.85%), while the purity and the yield were efficient (96.23 ± 1.09% and 90.75 ± 1.72%, respectively). In conclusion, the magnetic beads method (purity: 98.02 ± 0.45%, yield: 91.05 ± 2.43%, viability: 97.57 ± 0.37%) was the most advantageous of these three procedures. Moreover, in the functional assay, radical oxygen products from eosinophils isolated by the procedure with complement reaction were less than with the magnetic beads or FACS procedures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1398-9995.1995.tb02477.x
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  • 7
    Electronic Resource
    Electronic Resource
    The effect of rainwater infiltration within a slope of pyroclastic deposits, recorded using automated electric prospecting (1998)
    Springer
    Bulletin of engineering geology and the environment 57 (1998), S. 51-58 
    Details
    ISSN: 1435-9537
    Keywords: Key words Slope failure ; Rainfall ; Resistivity ; Electric prospecting ; Pyroclastic deposits ; Japan
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Description / Table of Contents: Resumé Dans une région soumise à la mousson, l'infiltration des eaux de pluie dans un talus est l'un des facteurs déterminants de sa stabilité. Pour comprendre le processus d'infiltration, on a utilisé une méthode automatisée de prospection électrique pour mesurer les modifications de la résistivité apparente à l'intérieur d'un talus, situé dans le sud de Kyushu, au Japon. La formation concernée est constituée de débris pyroclastiques quaternaires faiblement consolidés et perméables. Les mesures de résistivité effectuées sur une durée de six mois on mis en évidence les variations dans le talus, et en particulier un décalage marqué entre la chute de pluie et la modification de résistivité. Près de la surface, la réponsc est rapide et importante. A des profondeurs plus grandes, elle est plus lente et plus faible, mais les effets peuvent être cumulatifs.
    Notes: Abstract  Rainfall and its infiltration into a slope is one of the most important factors affecting slope stability in a monsoon region. To understand the infiltration process, changes in the apparent resistivity within a slope in southern Kyushu, Japan, have been measured using automated electric prospecting. The slope studied is underlain by Quaternary weak and permeable pyroclastic flow deposits. Resistivity data obtained over a six month period indicate that the conditions within the slope vary and a distinct time lag is recognised between the rainfall event and the change in resistivity. At near surface depths the response is rapid and large. At lower depths it is slower and smaller, but the effects may be cumulative.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100640050020
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  • 8
    Electronic Resource
    Electronic Resource
    A lower bound of the Perron-Frobenius eigenvalue of the Cartan matrix of a finite group (1999)
    Springer
    Archiv der Mathematik 73 (1999), S. 407-413 
    Details
    ISSN: 1420-8938
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract. In this article we exhibit a relation between the number k(B) of ordinary irreducible characters in a p-block B of a finite group G and the Cartan invariants c ij of B. Next, we give a lower bound of the Perron-Frobenius eigenvalue $\rho (C_B)$ of the Cartan matrix C B of B in terms of B, that is $k(B) \le \rho (C_B)l(B)$ , where l(B) is the number of irreducible Brauer characters in B. For p-solvable groups, we conjecture $k(B) \le \rho (C_B)$ that is closely related to the Brauer's k(B) conjecture.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s000130050416
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  • 9
    Electronic Resource
    Electronic Resource
    Fatigue Crack Growth Across the Interphase Boundaries in Two-Phase Bicrystals (1998)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 294-296 (Nov. 1998), p. 693-696 
    Details
    ISSN: 1662-9752
    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
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/03/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.294-296.693.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Evaluation of the malignancy of glioma using 11C-methionine positron emission tomography and proliferating cell nuclear antigen staining (1999)
    Springer
    Neurosurgical review 22 (1999), S. 210-214 
    Details
    ISSN: 1437-2320
    Keywords: Key words 11C-methionine ; PET ; PCNA ; Glioma
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  11C-methionine positron emission tomography (PET) and proliferating cell nuclear antigen (PCNA) staining were performed in 13 cases of glioma to investigate the relationship between the uptake of l-[methyl]-11C-methionine and the degree of malignancy and proliferative potential. The 11C-methionine uptake was significantly greater in high-grade gliomas compared to low-grade gliomas (P〈0.05). The PCNA indexes were also significantly higher in the high-grade cases (P〈0.05). Moreover, a strong positive correlation was found between the 11C-methionine values and the PCNA indexes (P〈0.005), demonstrating that higher 11C-methionine uptake was associated with greater proliferative potential and greater malignancy. 11C-methionine PET is a potentially useful preoperative method to discriminate the malignacy of glioma.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s101430050018
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