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  • 1
    Digitale Medien
    Digitale Medien
    Study of the electron field emission and microstructure correlation in nanocrystalline carbon thin films (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 89 (2001), S. 5671-5675 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Nanocrystalline carbon thin films were deposited by hot-filament chemical vapor deposition using a 2% concentration of methane in hydrogen. The films were deposited on molybdenum substrates under various substrate biasing conditions. A positive bias produced a continuous flow of electrons from the filament onto the substrate, while a negative bias caused the substrate to be bombarded with positive ions. Films were also grown under no bias, for comparison. Differences in the electron field emission properties (turn-on fields and emitted currents) of these films were characterized. Correspondingly, microstructural differences were also studied, as characterized with atomic force microscopy and Raman spectroscopy. Films grown under electron bombardment showed lower turn-on fields, smoother surfaces, and smaller grains than those grown under ion bombardment or no bias. A correlation between the enhanced emission properties and the nanocrystalline carbon material produced by the low-energy particle bombardment was found through the parameters obtained using spectroscopic ellipsometry modeling. The results confirm the significant role of defects on the electron field emission mechanism. © 2001 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1367873
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  • 2
    Digitale Medien
    Digitale Medien
    Electron field emission from sulfur-incorporated nanocrystalline carbon thin films (2001)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 79 (2001), S. 3446-3448 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Results are reported on the electron field emission properties of sulfur-incorporated nanocrystalline carbon (n-C:S) thin films grown by hot-filament chemical vapor deposition technique. The lowest turn-on field values observed were around 4.0–4.5 V/μm, which are about half of those measured for films grown without sulfur. Associated to the effect of addition of sulfur on field emission properties, there are interesting microstructural changes, as characterized with scanning electron microscopy, atomic force microscopy, and Raman spectroscopy techniques. The sulfur-incorporated films show smoother and finer-grained surfaces than those grown without sulfur. These results are similar to those found for the introduction of nitrogen, but different to those produced by oxygen addition to the chemical vapor deposition process. These findings are attributed to changes in the electronic band structure. © 2001 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1411988
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  • 3
    Digitale Medien
    Digitale Medien
    Nitric Oxide Produced by a Novel Nitric Oxide Synthase Isoform is Necessary for Gonadotropin-Releasing Hormone-Induced Growth Hormone Secretion Via a cGMP-Dependent Mechanism (2003)
    Oxford, UK : Blackwell Science, Ltd
    Journal of neuroendocrinology 15 (2003), S. 0 
    Details
    ISSN: 1365-2826
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: The involvement of nitric oxide (NO) in the regulation of goldfish growth hormone (GH) secretion was further characterized using primary cultures of dispersed goldfish pituitary cells. Western blots revealed the presence of an inducible nitric oxide synthase (iNOS)-like protein of approximately 120 kDa in cytosol/plasma membrane extracts. By contrast, brain NOS-immunoreactive proteins of approximately 120–140 kDa were occasionally detected in a cytoskeleton/organelle fraction but were absent from cytosol/plasma membrane extracts. The NO donor sodium nitroprusside (SNP) acutely increased GH secretion but this response was not observed in the presence of either a NO scavenger (PTIO) or a soluble guanylate cyclase inhibitor (ODQ). SNP also significantly increased the levels of cyclic (c)GMP in somatotrope-enriched cell populations. Treatments with 1400W (iNOS inhibitor), PTIO and rutin hydrate (NO scavengers) and ODQ abolished the acute GH-release response to two endogenous gonadotropin-releasing hormones (GnRH). 1400W, rutin hydrate, PTIO and ODQ alone did not significantly alter basal GH secretion. Together, these results establish that an iNOS-like peptide is constitutively present in the pituitary of the goldfish. Furthermore, these data suggest that NO, most likely through the generation of cGMP, is a necessary signal transduction component of GnRH-induced GH secretion.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1046/j.1365-2826.2003.01046.x
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  • 4
    Digitale Medien
    Digitale Medien
    Supportivtherapie im Rahmen der Hochdosis-Chemotherapie (2000)
    Springer
    Der Onkologe 6 (2000), S. 501-508 
    Details
    ISSN: 1433-0415
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: In die Behandlung chemotherapiesensibler Neoplasien haben in den letzten Jahren zunehmend Therapieverfahren Einzug gefunden, die durch eine höhere Dosisintensität der Chemotherapie eine Verbesserung der Remissionsraten erreichen sollen. Eine höhere Dosisintensität hat jedoch nicht selten eine höhere therapieassoziierte Toxizität zur Folge. Eines dieser modernen Therapieverfahren stellt die Hochdosis-Chemotherapie mit anschließender autologer oder allogener Stammzellrückgabe dar. In erfahrenen Zentren sollte die Mortalität im Rahmen der autologen Blutstammzelltransplantation unter 3% liegen. Dieses Ziel kann nur erreicht werden, indem adäquate supportive Therapiemaßnahmen zur Anwendung kommen. Nur in enger Kooperation mit dem betreuenden Pflegeteam können diese supportiven Maßnahmen entsprechend umgesetzt werden. Im folgenden Artikel werden ausgewählte Aspekte zur Supportivtherapie im Rahmen der Hochdosis-Chemotherapie dargelegt.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s007610070085
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  • 5
    Digitale Medien
    Digitale Medien
    Thermal Stability and Viscosity of Mg-Based Glasses and Composites (2000)
    s.l. ; Stafa-Zurich, Switzerland
    Journal of metastable and nanocrystalline materials Vol. 8 (May 2000), p. 129-134 
    Details
    ISSN: 1422-6375
    Quelle: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Thema: Maschinenbau
    Materialart: Digitale Medien
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/43/transtech_doi~10.4028%252Fwww.scientific.net%252FJMNM.8.129.pdf
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  • 6
    Digitale Medien
    Digitale Medien
    Thermal Stability and Viscosity of Mg-Based Glasses and Composites (2000)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 343-346 (May 2000), p. 129-134 
    Details
    ISSN: 1662-9752
    Quelle: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Thema: Maschinenbau
    Materialart: Digitale Medien
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/05/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.343-346.129.pdf
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  • 7
    Digitale Medien
    Digitale Medien
    On the nature of the 17 μs isomer of the 133Sb valence nucleus (2000)
    Springer
    The European physical journal 7 (2000), S. 463-465 
    Details
    ISSN: 1434-601X
    Schlagwort(e): PACS:21.10.Tg Lifetimes – 23.20.Lv Gamma transition level energies – 25.85.Ec Neutron-induced fission – 21.60.Cs Shell model – 27.60.+j 90 ≤ A ≤ 149
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract: The decay of the 17 μs isomer of 133Sb was re-investigated experimentally. It was produced by thermal neutron induced fission of 241Pu. Its detection is based on time correlation between fission fragments selected by the LOHENGRIN spectrometer at ILL (Grenoble), and the γ-rays, and conversion electrons from the isomer. The interpretation of the level scheme is based on shell model calculations, where empirical two-body matrix elements were employed. The good agreement between theory and experiment suggests that the isomer is the 21/2+ member of the 2p-1h πg 7/2ν(f 7/2 h 11/2 −1) configuration.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/PL00013643
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  • 8
    Digitale Medien
    Digitale Medien
    Configuration assignments and decay of 126La high-spin bands (2000)
    Springer
    The European physical journal 7 (2000), S. 7-10 
    Details
    ISSN: 1434-601X
    Schlagwort(e): PACS: 21.10.Re Collective levels – 23.20.Lv Gamma transitions and level energies – 21.60.Ev Collective models – 27.60.+j 90 ≤ A ≤ 149
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract: High spin states of 126La have been populated using the reaction 116Sn+14N at 68 MeV. γ-rays and conversion electrons were detected with the GAREL array. Multipolarities of the lowest-lying in-band dipole transitions have been determined from the deduced internal conversion coefficients. Experimental B(M1)/B(E2) ratios have been derived for the bands and compared with calculated values using the Dönau-Frauendorf geometrical model. Configurations are proposed for the bands comparing them with cranked shell model calculations and on the basis of the measured B(M1)/B(E2) ratios. The β-decay of 126La has also been revisited. The population of the 126Ba levels gives a probable spin value of five for the decaying high-spin 126La state with T 1/2≈ 64 s which may indicate a signature inversion in the πh11/2νh11/2 band.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s100500050002
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  • 9
    Digitale Medien
    Digitale Medien
    Level structure of Cs observed from Ba decay and described using the IBFM and CQPC models (2000)
    Springer
    The European physical journal 8 (2000), S. 41-58 
    Details
    ISSN: 1434-601X
    Schlagwort(e): PACS. 21.10.Re Collective levels – 23.20.Lv Gamma transitions and level energies – 23.20 Nx Internal conversion – 21.60.Ev Collective models – 27.60.+j 90 ≤A≤ 149
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract: The decay of 123Ba to 123Cs has been studied with mass-separated sources. Singles spectra of -rays, X-rays and conversion electrons as well as , , and X-e-t coincidences were recorded. A level scheme of 123Cs has been constructed including 26 new excited states and 82 transitions. The existence of a I =11/2-, T =1.7 s isomer, bandhead of the h band, is confirmed. Its excitation energy equals 156.3 keV. A new T =114 ns isomer has been established at 232 keV using the in-beam recoil catcher technique. It is assigned to the I =9/2+ bandhead of the g band. Collective bands based on the 1/2+ ground state and first 3/2+ excited state are proposed. The level structure is described in the frame of the interacting boson-fermion and core-quasiparticle coupling models.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s100530050007
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  • 10
    Digitale Medien
    Digitale Medien
    Noncontacting strain measurements at high temperatures by the digital laser speckle technique (2000)
    Springer
    Experimental mechanics 40 (2000), S. 98-105 
    Details
    ISSN: 1741-2765
    Schlagwort(e): Strain measurement ; digital speckle correlation technique ; thermal strain ; large mechanical strain ; high test temperature
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract This paper presents a newly developed laser-based noncontacting strain sensor suitable for temperatures up to 1200°C, which was adapted to a commercial tensile testing machine equipped with an electrical furnace. The principle of the strain sensor is based on tracking laser speckles through a digital correlation technique. Furthermore, the description of the signal processing and the optical arrangement is presented. Based on the experimental data, it can be show that this simple, laser-based strain sensor can be used successfully for the determination of mechanical and thermal strains up to temperatures of about 1200°C. Using a special data-processing procedure, it was feasible to minimize decorrelation effects caused by changes in the specimen surface due to, for example, slipband and microcrack formation, surface oxidation and phase transformation and, thus, measure large mechanical strains. The strain resolution for the selected setup was about 20 microstrains depending on the testing parameters.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02327556
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